• 专利附录
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    • 专利摘要:
    A method for operating a vacuum pump system comprising the steps of: operating a primary vacuum pump 9 comprising a variable speed motor; - switching at least two secondary vacuum pumps 10 and the primary vacuum pump 9 in parallel; - dividing the secondary vacuum pumps 10 into groups, wherein each group comprises at least one secondary vacuum pump 10; - assigning a priority to each of those groups; characterized in that the method further comprises the steps of: - measuring the inlet pressure p1, comparing the measured inlet pressure p1 with a predetermined pressure value p0, and if p1 is higher than p0, starting the secondary vacuum pump 10 at a first predetermined starting load Sstart, 1 if it comprises a fixed-speed motor, and / or starting the secondary vacuum pump 10 at a second predetermined starting load Sstart, 2, if it comprises a variable-speed motor.
    公开号:BE1024411B1
    申请号:E2017/5008
    申请日:2017-01-10
    公开日:2018-02-12
    发明作者:Joeri COECKELBERGS
    申请人:Atlas Copco Airpower Naamloze Vennootschap；
    IPC主号:
    专利说明:

    (73) Holder (s):
    ATLAS COPCO AIRPOWER public limited company
    2610, WILRIJK
    Belgium (72) Inventor (s):
    COECKELBERGS Joeri 2610 WILRIJK Belgium (54) Method for operating a vacuum pump system and vacuum pump system applying such a method.
    (57) A method of operating a vacuum pump system comprising the steps of: operating a primary vacuum pump 9 comprising a variable speed motor; - connecting at least two secondary vacuum pumps 10 and the primary vacuum pump 9 in parallel; dividing the secondary vacuum pumps 10 into groups, each group comprising at least one secondary vacuum pump 10; - assigning a priority to each of those groups; characterized in that the method further comprises the steps of: measuring the inlet pressure pl, comparing the measured inlet pressure pl with a predetermined pressure value pO, and if pl is higher than pO, starting the secondary vacuum pump 10 at a first predetermined starting load Sstart. 1 if it comprises a fixed speed motor, and / or starting the secondary vacuum pump 10 at a second predetermined starting load Sstart, 2 if it comprises a variable speed drive motor.
    FS au'ir 1
    BELGIAN INVENTION PATENT
    FPS Economy, K.M.O., Self-employed & Energy
    Publication number: 1024411 Filing number: BE2017 / 5008
    Intellectual Property Office International Classification: F04C 23/00 F04C 25/02 F04C 28/02 F04B 49/08 F04B 49/06 Date of Issue: 12/02/2018
    The Minister of Economy,
    Having regard to the Paris Convention of 20 March 1883 for the Protection of Industrial Property;
    Having regard to the Law of March 28, 1984 on inventive patents, Article 22, for patent applications filed before September 22, 2014;
    Having regard to Title 1 Invention Patents of Book XI of the Economic Law Code, Article XI.24, for patent applications filed from September 22, 2014;
    Having regard to the Royal Decree of 2 December 1986 on the filing, granting and maintenance of inventive patents, Article 28;
    Having regard to the application for an invention patent received by the Intellectual Property Office on 10/01/2017.
    Whereas for patent applications that fall within the scope of Title 1, Book XI, of the Code of Economic Law (hereinafter WER), in accordance with Article XI.19, § 4, second paragraph, of the WER, the granted patent will be limited. to the patent claims for which the novelty search report was prepared, when the patent application is the subject of a novelty search report indicating a lack of unity of invention as referred to in paragraph 1, and when the applicant does not limit his filing and does not file a divisional application in accordance with the search report.
    Decision:
    Article 1
    ATLAS COPCO AIRPOWER public limited company, Boomsesteenweg 957, 2610 WILRIJK Belgium;
    represented by
    VAN VARENBERG Patrick, Arenbergstraat 13, 2000, ANTWERP;
    a Belgian invention patent with a term of 20 years, subject to payment of the annual fees as referred to in Article XI.48, § 1 of the Code of Economic Law, for: Method for operating a vacuum pump system and vacuum pump system that uses such a method applies ..
    INVENTOR (S):
    COECKELBERGS Joeri, c / o ATLAS COPCO AIRPOWER, limited liability company Boomsesteenweg 957, 2610, WILRIJK;
    PRIORITY:
    2/23/2016 US 62 / 298,788;
    BREAKDOWN:
    Split from basic application: Filing date of the basic application:
    Article 2. - This patent is granted without prior investigation into the patentability of the invention, without warranty of the Merit of the invention, nor of the accuracy of its description and at the risk of the applicant (s).
    Brussels, 12/02/2018,
    With special authorization:
    BE2017 / 5008
    A method of operating a vacuum pump system and vacuum pump system employing such a method.
    This invention relates to a method of operating a vacuum pump system, the method comprising the steps of: operating a primary vacuum pump comprising a variable speed motor; connecting at least two secondary vacuum pumps and the primary vacuum pump in parallel, each of the at least two secondary vacuum pumps comprising a motor; dividing the secondary vacuum pumps into groups, each group comprising at least one secondary vacuum pump, and assigning a priority to each of those groups.
    Systems that include multiple vacuum pumps already exist, such as, for example, the system disclosed in US 5,522,707 B to Metropolitan Industries, Inc. The system described therein uses a controller to start an additional pump when the vacuum demand increases. When a variable speed vacuum pump reaches maximum flow, the controller starts a fixed speed vacuum pump and the variable speed vacuum pump stops
    Such a system and control logic is not suitable for all kinds of applications. If we take the example of a variable speed pump that has a higher one
    BE2017 / 5008 capacity than a fixed speed pump, such control logic can cause unwanted fluctuations affecting the user's application.
    In addition, such control logic will not prevent the system design from being either too small or too large for the application to which the system is connected, as it considers the start-up of a fixed speed pump to be equivalent to the operating capacity of a variable speed pump running at maximum yield is running.
    In addition, such control logic would not allow a user of the system to control the energy efficiency of the system or minimize maintenance costs, since the user cannot influence which of the vacuum pumps is running.
    Taking into account the above drawbacks, the present invention aims to provide a pumping system that adapts its capacity to a varying demand for a user application. Consequently, the pump system will be neither under nor over-dimensioned, even if the demand of the user applications changes over time.
    Another object of the present invention is to provide a pumping system that allows a user to adjust the response time of the system according to the requirements of the application. The invention further allows the user to reduce its maintenance costs
    BE2017 / 5008 and even wear of the pumps that are part of the system.
    Accordingly, the present invention aims to provide a flexible, easily controllable, low cost, vacuum system equally suited to different applications having different pressure requirements, without special service interventions.
    The present invention solves at least one of the above-mentioned and / or other problems by providing a method of operating a vacuum pumping system, the method comprising the steps of:
    operating a primary vacuum pump comprising a variable speed motor;
    ~ parallel connection of at least two secondary vacuum pumps and the primary vacuum pump, each of the at least two secondary vacuum pumps comprising a motor;
    dividing the secondary vacuum pumps into groups, each group comprising at least one secondary vacuum pump;
    - assigning a priority to each of those groups;
    the method further comprising the steps of:
    - performing a first measurement of the inlet pressure at an inlet of the vacuum pump system;
    BE2017 / 5008 inlet pressure pressure value, comparing the first measured inlet pressure with a predetermined pressure value and, if the measured is higher than the predetermined operation of the at least one secondary vacuum pump that is part of the group with the highest priority;
    - making a second measurement of the inlet pressure at the inlet of the vacuum pump system;
    comparing the second measured inlet pressure to the predetermined pressure value and, if the second measured inlet pressure is higher than the predetermined pressure value, operating the at least one secondary vacuum pump of the group to which the second highest priority is assigned, the method further the step of starting the secondary vacuum pump at a first predetermined starting load if it comprises a fixed-speed motor, and / or starting the secondary vacuum pump at a second predetermined starting load, if the secondary vacuum pump is a variable-speed motor includes.
    Effectively, by dividing the secondary vacuum pumps into groups and assigning a priority to each of the groups, better control of the operating hours of each of the vacuum pumps is achieved. This allows better anticipation of the maintenance process for each of the vacuum pumps.
    BE2017 / 5008
    By starting the secondary vacuum pump at a first predetermined starting load or at a second predetermined starting load depending on whether the pump comprises a fixed speed motor or a variable speed motor, the vacuum pump system allows better control of the pressure obtained to the inlet of the vacuum pump system and better control of the load of each vacuum pump, which affects the wear of each pump and consequently the time interval in which maintenance will be required. As a result, the demand of a user application is met without risking that the vacuum pump system is over- or under-dimensioned.
    In addition, such a method can be implemented within a system that includes vacuum pumps of different capacity, or even includes a combination of vacuum pumps that achieve both high vacuum and low vacuum levels, and, for all required vacuum levels, the vacuum pump system is controlled in a very simple way by implementing the method defined herein.
    In addition, by starting a secondary vacuum pump at a second predetermined starting load, the inlet pressure can be reduced sequentially and only to the extent necessary to meet user demand. Consequently, if the vacuum pump system includes a high capacity pump, such a pump will not run at a higher load than required by the
    BE2017 / 5008 user application. As a result, a high capacity pump can efficiently achieve high, medium or low capacity without risking the system being under- or over-dimensioned to meet the flow rate and therefore the user network demand.
    By applying the method of the present invention, the vacuum pump system can be easily adapted to different vacuum requirements, and therefore can be used for different applications without the need for manual intervention.
    In addition, since the vacuum pumps cannot be started at maximum load and since the method of the present invention divides the secondary vacuum pumps into groups and operates them depending on the assigned priority, uniform wear of all vacuum pumps can be achieved.
    In addition, depending on where a user of a vacuum pump system according to the present invention is located geographically, the costs incurred by the operation of the vacuum pump system may differ in function of, for example: the electricity price, the environmental conditions, or even how easily accessible the system is is for maintenance. Consequently, energy optimization may be needed in some geographical areas, while wear optimization may be a better solution in others.
    BE2017 / 5008
    The method of the present invention is feasible for both such situations since the secondary vacuum pumps are started at the first predetermined starting load, respectively, at the second predetermined starting load. Depending on whether the first predetermined starting load and the second predetermined starting load are selected at a relatively high level or at a relatively low level, the user of the vacuum pump system according to the present invention chooses which of the two efficiency options he needs: either maintenance optimization of the vacuum pump system, or optimization of power consumption.
    Preferably, the vacuum pump system includes oil injection screw vacuum pumps, which are known to be more efficient at lower speeds than at higher speeds.
    In a preferred embodiment of the present invention, the user of the vacuum pump system chooses which option to choose by selecting the value of the second predetermined starting load: when the second predetermined starting load is selected at a relatively low value, implying that the speed of the vacuum pump will be relatively low, energy efficiency is high and will run a relatively high number of pumps to meet the demand. While, if the second predetermined starting load is selected at a relatively high value, which implies that the speed of the vacuum pump is relatively high, the
    BE2017 / 5008 efficiency of the vacuum pumps is lower than in the previous case but even wear of the vacuum pumps will be realized, as the number of operating hours of the secondary vacuum pumps that are part of the same group can be better controlled, which means that fewer vacuum pumps will need service interventions in a time interval.
    Preferably, the vacuum pump system starts a secondary vacuum pump when the primary vacuum pump is running at a first maximum load.
    The present invention is further directed to a vacuum pump system comprising:
    - a primary vacuum pump comprising a variable speed motor;
    - at least two secondary vacuum pumps connected in parallel with the primary vacuum pump, each of the at least two secondary vacuum pumps comprising a motor;
    - a pressure sensor to measure the inlet pressure of the vacuum pump system at an inlet thereof;
    control means comprising communication means for communicating with one or more of: the primary vacuum pump and at least two secondary vacuum pumps;
    the control means further comprising processing means comprising an algorithm configured
    BE2017 / 5008 to apply the method according to the present invention.
    With the insight to better demonstrate the features of the invention, some preferred configurations of the present invention are described below, by way of example without limitation, with reference to the accompanying drawings, in which:
    Figure 1 schematically depicts a vacuum pump system according to an embodiment of the present invention;
    Figure 2 schematically illustrates a split of the achievable maximum and minimum pressures of the vacuum pump system of Figure 1 into five pressure zones according to an embodiment of the present invention; and, Figure 3 shows schematically the SER curve (specific energy consumption) for vacuum pumps with oil injection.
    Figure 1 illustrates a vacuum pump system 1 comprising a plurality of vacuum pumps 2 and a control unit 3 which controls the vacuum pumps 2. The system is further connected to a vacuum user 4 within an external user network via a flow line 5. The vacuum pump system 1 may further comprise a buffer vessel 6 to receive fluid from the vacuum pumps 2. Such a buffer vessel 6 increases the stability of the vacuum pump system 1 as it is one
    BE2017 / 5008 fluid volume ensures that it is immediately ready for the user network 4.
    The control unit 3 controls the vacuum pumps 2 via an electrical connection 7.
    In Figure 1 an example of a vacuum pump system according to the present invention is illustrated, such a system comprising four vacuum port pin 2, interconnected via a flow line 8.
    The present invention should not be limited to a vacuum pump system 1 comprising only four vacuum pumps 2. The method according to the present invention is applicable within Systems comprising less vacuum pumps 2 as well as more vacuum pumps 2, such as, for example, a vacuum pump system 1 comprising three or more than four vacuum pumps 2.
    Preferably, one of the vacuum pumps 2 is identified as the primary vacuum pump 9. Preferably, the primary vacuum pump 9 includes a variable speed motor (not illustrated) so that the load on the pump can be gradually increased. At least two secondary vacuum pumps 10 are connected in parallel with the primary vacuum pump 9, each of the at least two secondary vacuum pumps 10 comprising a motor (not illustrated).
    The working principle is very simple and as follows.
    BE2017 / 5008
    A demand for vacuum is received from the vacuum user 4 and a primary vacuum pump 9 is operated by the control unit 3, the load of the primary vacuum pump 9 being operated between a first minimum load Smin, i and a first maximum load S m ax, i lies.
    Preferably, when the control unit 3 operates the primary vacuum pump 9, it starts the primary vacuum pump 9 at a load between the first minimum load Smin.i and a first maximum load S ma x, i, but preferably less than the first maximum load Smax, i , and gradually increases the load to meet the demand of the vacuum user 4.
    For example, the primary vacuum pump 9 can be started with a load, S s tart, o, selected to be between 10% and 90%, such as, for example, but not limited to: at a load of 30%, with a load of 40%, at a load of 50%, or at a load of 60% or any value in between,
    In an embodiment of the present invention, such a load may be gradually increased by a percentage, kO, selected between 5% and 50%, depending on the application and user preferences, for example, but not limited to, increase the load by: 10% load, or 20% load, or 30% load, or any other value in between, depending on the
    BE2017 / 5008 characteristics of the user network and the required response time.
    Preferably, but not limited to, the primary vacuum pump 9 is started at Sstart, o = 40% load and such load can be gradually increased by k0 = 20%. Such an increase is applied until the primary vacuum pump 9 runs at a first maximum load, S ma; c , i.
    In another embodiment of the present invention, the primary vacuum pump 6 is controlled by, for example, but not limited to, a proportional integrating controller (PI controller) or a proportionally integrating and differentiating controller (PID controller} (not shown). the control unit 3 communicates with the PI or PID controller.
    Accordingly, the control unit 3 preferably starts the primary vacuum pump 6 with a load, S s tart, o, and the PI or PIDregelaar is preferably used continuously on its load to a stable pressure, pl, to keep to an inlet 11 of the vacuum pumping system 1 and with the intention of achieving the predetermined pressure value, pO, required by the user network 4. The PI or PID controller will therefore control the speed of the motor driving the primary vacuum pump 6, and the flow rate of the primary vacuum pump 6 provides, continuous adjustment to meet the requirements of the user network 4, until the primary vacuum pump reaches its maximum load, S max , i.
    BE2017 / 5008
    If the primary vacuum pump 9 is running at a first maximum load, S max , i, and the pressure value, pl, measured at the inlet 11 is not equal to or less than a predetermined pressure value, pO, the control unit 3 will provide a secondary vacuum pump 10 operate. It should be assumed that the predetermined pressure value, pO, corresponds to the demand of the vacuum user 4.
    Preferably, the at least two secondary vacuum pumps 10 run between a second minimum load , S m in, 2 / and a second maximum load, S raax , 2.
    In the context of the present invention, it is to be assumed that the first minimum load may be equal to the second minimum load, S m in, 2, or that such articles may have different values. In addition, different secondary vacuum pumps can have 10 different second minimum loads, Smin, 2. It should be assumed that the same logic applies to the first maximum load, S max , i, and the second maximum load, S ma x, 2.
    In an embodiment of the present invention, the first minimum load, the second minimum load S m in, 2, the first maximum load, Sm ax , i, and the second maximum load, S ma x, 2 are respectively selected at a value higher than the absolute minimum load and at a value lower than the absolute maximum load of the vacuum pump, so that the service life
    BE2017 / 5008 of the motors driving the vacuum pumps 2 is extended.
    Preferably, the secondary vacuum pumps 10 are divided into groups, each group comprising at least one secondary vacuum pump 10 and a priority being assigned to each of the groups.
    In the context of the present invention, it is to be assumed that the priority determines the order in which the control unit selects the groups and operates the at least one secondary vacuum pump 10 which is part of such a group.
    By way of example, but not limited to, such priority may be in the form of a number or letter, or any other kind of distinction that can be made for each group. Furthermore, a logic is assigned to the priority, the logic determining the highest and the lowest priority and, consequently, the order in which the control unit 3 selects the groups and the secondary vacuum pumps 10 start and / or stop,
    For example, if the pressure value, pl, measured at the inlet 11 of the vacuum pump system is not equal to or less than the predetermined pressure value, pO, the control unit 3 selects the group to which the highest priority is assigned and operates a secondary vacuum pump 10 which is part of that group.
    BE2017 / 5008
    Furthermore, the control unit 3 compares the pressure value, pl, measured at the inlet 11 with the predetermined pressure value, pO, and, if the pressure value, pl, measured at the inlet 11 is still higher than the predetermined pressure value, pO, the control unit 3 the at least one secondary vacuum pump 10 of the group to which the second highest priority is assigned. It should be assumed that a group may comprise more than one secondary vacuum pump 10, and if so, the control unit 3 will preferably operate another secondary vacuum pump 10 that is part of the same group.
    If the group has no other secondary vacuum pump 10 that can be operated, the control unit 3 will select the next highest priority group from the remaining groups and operate a secondary vacuum pump 10 that is part of that group.
    In the context of the present invention, the load is to be understood to mean the power of the motor driving a vacuum pump 2.
    Furthermore, it must be assumed that the load of a vacuum pump 2 depends directly on the speed of the motor, the pressure value, pl, measured at the inlet 11 and the fluid volume that the vacuum pump system 1 must supply in order to meet the requirements of the user network 4, in what follows is called the flow rate. Furthermore, it should be assumed that if the speed of
    BE2017 / 5008 a motor controlling a vacuum pump 2 is increased, the intensity of the current flowing through the motor is increased, which means that the load of the vacuum pump 2 increases. Consequently, as the flow demand increases to the user network 4, the pressure value, pi, measured at the inlet 11 increases and, in order to keep such a pressure value, pi, constant, the control unit 3 increases the speed of a vacuum pump 2, which means that the load on the motor driving such vacuum pump 2 increases.
    In the context of the present invention, it is to be assumed that the secondary vacuum pumps 10 that are part of the same group have been assigned the same group priority. Therefore, better control of the number of operating hours of each of the secondary vacuum pumps 10 can be achieved by determining in which order and which of the secondary vacuum pumps are operated.
    Furthermore, it should be assumed that, by operating a vacuum pump 2, the control unit 2 starts such a vacuum pump 2, and controls the load of the vacuum pump 2.
    In another embodiment of the present invention, but not limited to, the control unit 3 can further assign priorities to the secondary vacuum pumps 10 that are part of the same group,
    BE2017 / 5008 so that a clear sequence is defined in which those secondary vacuum pumps 10 are operated.
    For example, and not limited to, the control unit 3 first operates the secondary vacuum pump 10 which is part of such a group, the secondary vacuum pump being identified as having the least number of operating hours.
    Furthermore, the control unit 3 will preferably operate a secondary vacuum pump 10, which is part of the same group and identified as having the second least number of operating hours.
    Preferably, such steps are repeated until all secondary vacuum pumps 10 belonging to the same group have been operated. If further required, the control unit 3 will preferably apply the same logic to the group having the second highest priority of the other groups.
    Preferably, a secondary vacuum pump 10 started at a first predetermined starting load, S s tart, i, if it comprises a motor with a fixed speed, and / or the secondary vacuum pump 10 is started at a second predetermined starting load, S s tart, 2, if the secondary vacuum pump 10 includes a variable speed motor.
    In another embodiment of the present invention, the method repeats the step of comparing the measured inlet pressure, pl, with the predetermined
    BE2017 / 5008 determined pressure value, pO, and if, the subsequently measured pressure, pl, at the inlet 11 is higher than the predetermined pressure value, pO, operating the at least one secondary vacuum pump 10 that is part of the group comprising a second highest priority, until the pressure, pl, measured at the inlet 11, reaches the value of the predetermined pressure, pO, or until all secondary vacuum pumps are running.
    In a preferred embodiment of the present invention, operation of at least one secondary vacuum pump 10 that is part of the highest priority group is by starting one secondary vacuum pump 10 at a time, and if the pressure, pl, measured at the inlet 11 is higher is then the predetermined pressure value, pO, the vacuum pump system 1 starts another secondary vacuum pump 10 which is part of the same group with the highest priority or, if all the vacuum pumps of the group with the highest priority are running, the method further comprises the step of starting a secondary vacuum pump 10, which is part of the group with the second highest priority.
    Preferably, operation of at least one secondary vacuum pump 10 that is part of the second highest priority group is by starting one secondary vacuum pump 10 at a time, and if the measured inlet pressure, pl, is higher than the predetermined pressure value, pO, starts the vacuum pump system 10 is another secondary vacuum pump 10 that is part of the same
    BE2017 / 5008 group with the second highest priority or, if all the secondary vacuum pumps 10 of the group with the second highest priority are running, the method further comprises the step of starting a secondary vacuum pump 10, which is part of the group with the subsequent highest priority.
    In one embodiment of the present invention, and not limited to, if a secondary vacuum pump 10 operated by the control unit 3 comprises a variable speed motor, the control unit will identify such secondary vacuum pump 10 as the new primary vacuum pump 9, and identify previous primary vacuum pump 9 as a secondary vacuum pump 10. Preferably, if the secondary vacuum pump 10 includes a variable speed motor, the second predetermined starting load, S s tart, 2 is less than the second maximum load, S max , 2. If the secondary vacuum pump 10 includes a motor with a fixed speed, the first predetermined starting load, S s tart, i approximately the same value as the second maximum load, Smax, 2.
    In another embodiment, but not limited to, all secondary vacuum pumps 10 have a variable speed motor, and the control unit 3 preferably starts each of the secondary vacuum pumps 10 at a second predetermined starting load, and keeps such a load constant. Consequently, the vacuum pump system is much more stable and easier to control.
    BE2017 / 5008
    In such a case, the primary vacuum pump 9 can either remain the vacuum pump 2 with the least operating hours of the highest priority group, or it can be identified as the last secondary vacuum pump 10 operated, said secondary vacuum pump 10 having a motor with variable speed. It is preferred that when the control unit 3 identifies a secondary vacuum pump 10 as the new primary vacuum pump 9, the capacity of the newly identified primary vacuum pump 9 corresponds to the capacity of the previously identified primary vacuum pump 9, so that no fluctuation is experienced by the vacuum user 4.
    In a preferred embodiment of the present invention, the vacuum pumps 2 that are part of the vacuum pump system 1 are first split into groups and priorities are assigned to such groups. The priority can be assigned according to the capacity of each vacuum pump 2, such as but not limited to: the highest priority can be assigned to the group of vacuum pumps 2 that has the highest capacity, the next highest priority can be assigned to the group of vacuum pumps 2 which has the next highest capacity. Such a step is repeated until the lowest priority is assigned to the group of vacuum pumps 2 having the lowest capacity.
    BE2017 / 5008
    It should be assumed that such priority can be selected differently according to customer requirements.
    If one of the groups comprises more than one vacuum pump 2, the control unit 3 compares the number of operating hours of such vacuum pumps 2 and assigns a sequence in which those vacuum pumps 2 are operated.
    In such a case, the primary vacuum pump 9 is preferably selected as the vacuum pump 2 which is part of the group with the highest priority and the least operating hours.
    Preferably, the primary vacuum pump 9 always includes a variable speed motor.
    It should be assumed that the control unit 3 can also apply another logic to select the primary vacuum pump 9, such as, for example, comparing the number of operating hours of all the vacuum pumps 2 that are part of the vacuum pump system 1 and select the vacuum pump 2 that has the least operating hours.
    In a preferred embodiment of the present invention, if the secondary vacuum pump 10 comprises a fixed speed motor, the first predetermined starting load, S 3 defies, i, is the same value as the second maximum load, S ma x, 2, which is preferably 100¾. If the secondary vacuum pump 10 includes a variable speed motor, the starting load is preferably selected
    BE2017 / 5008 as the second predetermined start-load, S s tart, 2, which has a value selected to be between 10% and 90%, such as, for example, but not limited to, 30% load, 40% load, or 50% load, or any other intermediate or higher value of the interval.
    Preferably, the control unit 3 measures the pressure, pl, at the inlet 11 of the vacuum pump system 1 and compares the measured inlet pressure, pl, with the predetermined pressure value, pO, after a control time interval. By applying such a logic, the computing power of the general system is kept to a minimum, while a short response time of the system is maintained.
    It is also possible for one variable speed motor to control two or more vacuum pumps 2 connected in parallel, each such vacuum pump 2 being operated individually. It is also possible that those vacuum pumps 2 are controlled by the same motor and are operated simultaneously.
    Preferably, the control unit applies a waiting time interval between the measurement of the pressure, pl, at the inlet 11 and the moment it operates a secondary vacuum pump 10. By applying such a waiting time interval, sudden transient fluctuations of the predetermined pressure value, pO, to the user network do not affect the operation of the vacuum pump system 1.
    Consequently, if the customer's network experiences a sudden momentary load from, for example, one
    BE2017 / 5008 valve that suddenly opens, or the like, will give the system the necessary time to re-stabilize without starting and then stopping a secondary vacuum pump 10, or vice versa. However, as the predetermined pressure value, pO, changes to the user network, the vacuum pump system 1 will measure that demand in a very short time interval and efficiently, reducing the risk of a secondary vacuum pump being started or stopped based on a false change in demand.
    In addition, by applying that waiting time interval, system efficiency is maintained without the use of complex control logic. In addition, through such an implementation, the secondary vacuum pumps 10 can achieve optimal operating parameters.
    Such a wait time interval can be any length, preferably selected between 10 and 50 seconds, but not limited to, depending on the requirements of the user network.
    Furthermore, to have a very accurate measurement of the pressure, pi, at the inlet 11, the sampling frequency of such pressure value can be chosen relatively high such as, for example, but not limited to: between about 1 second and about 200 milliseconds, more preferably between 700 milliseconds and 200 milliseconds, even more preferably the sampling frequency can be selected
    BE2017 / 5008 at approximately 200 milliseconds. In another embodiment, the measurement of the pressure, pl, at the inlet 11 is made in real time.
    In yet another embodiment, if all the secondary vacuum pumps 10 of the vacuum pump system 1 are running and the pressure, pl, measured at the inlet 11 is still higher than the predetermined pressure value, pO, the vacuum pump system 1 preferably increases the load of a secondary vacuum pump 10 which comprises a motor with variable sneiheid, up to a first operating load, Sbedrijf, i, selected to be between the second predetermined start-load, s s tart, 2, and the second maximum load, Smax, 2 ·
    Such a secondary vacuum pump 10 can be arbitrarily selected by the control unit 3, or a logic can be applied, such as, for example, but not limited to: the first or the last secondary vacuum pump that was started, or the secondary vacuum pump 10 with the highest or the lowest number of operating hours, or the secondary vacuum pump 10 with the lowest speed, or the like.
    In another embodiment of the present invention, the load on one of the secondary vacuum pumps is increased by a percentage, kl, selected between 5% and 50%, such as, for example, but not limited to: 10%, or 20%, or 30%, or any other intermediate or higher value of the interval.
    BE2017 / 5008
    Consequently, the load defined by kl can be defined by the formula:
    load (kl) = Soperation, i - S st art, 2
    It is necessary to be considered that the value of the second predetermined start beia sting, S s tart, 2, and k geseiecteerd be according to the requirements of the user network.
    Preferably, the control unit 3 increases the load of each of the secondary vacuum pumps 10 comprising a variable speed motor to a first operating load, Sbedri-jf, i, in ds order of the assigned priority, if the measured inlet pressure, pi, is higher than the predetermined pressure value, pO.
    For even greater efficiency, the system can increase the load on all secondary vacuum pumps 10 that have a variable speed motor. Such an increase can be made for all secondary vacuum pumps 10 simultaneously, or for one secondary vacuum pump 10 at a time, until the pressure, pi, measured at the inlet 11 is equal to or less than the predetermined pressure value, pO.
    In another embodiment of the present invention, if the pressure, pi, measured at the inlet 11 is higher than the predetermined pressure value, pO, and the current operating load, Secondary, of the at least one secondary vacuum pump 10 is lower than the second
    BE2017 / 5008 maximum load, S m ax, 2, the control unit further increases the load of at least one of the secondary vacuum pumps 10 by the same percentage, kl. Consequently, at least one secondary vacuum pump will have a current operating load, S secondary f which can be calculated by the formula: Secondary = S operation, i + [n load (kl)], where n is a natural number, preferably equal to or greater than a.
    For the purposes of the present invention, it is to be assumed that operating load is that the formula by which the current Secondary is calculated is an incremental function, where the lowest value of n is one, and in which n increments by one in subsequent steps, until the pressure, pl, measured at the inlet 11 is equal to or less than the predetermined pressure value, pO, or until the current operating load, Secondary, is equal to the second maximum load, Sffiax , 2.
    Preferably, but not limited to, the load on all secondary vacuum pumps 10 is increased by kl whenever the control unit determines that the pressure, pl, measured at the inlet 11, is higher than the predetermined pressure value, pO, or all secondary vacuum pumps 10 run on the second maximum load, S max , 2.
    When the demand for the user network decreases, and the pressure, pl, measured at the inlet 11 is less than the predetermined pressure value, pO, the control unit 3 preferably adjusts the load of the primary vacuum pump 6 continuously via the PI or PID controller to meet the demand of the
    BE2017 / 5008 user network 4. Preferably, the control unit 3 adjusts the load of the primary vacuum pump 6 until the primary vacuum pump reaches the first minimum load, Sp / iin, 1.
    The present invention should not be limited to such control logic, and it should be considered that a gradual reduction of the load can also be implemented such that, if the pressure, pl, measured at the inlet 11 is lower than the predetermined pressure value, pO, the load of the primary
    vacuum pump 9 becomes gradual lowered with kO, till the busy, pl, measured at the inlet 11 right is On or higher is then the predetermined pressure value, p0, or till the tax from the primary vacuum pump 9 the first
    minimum load, S m in, i reached.
    If the pressure, pl, measured at the inlet 11 is still less than the predetermined pressure value, pO, the control unit 3 reduces the load of a secondary vacuum pump 10, the secondary vacuum pump 10 comprising a variable speed motor, from the current business tax, S EeC undair, to the second predefined start load, S s tart, 2
    Preferably, the system applies a waiting time interval, t2, before the load of a secondary vacuum pump 10 is lowered.
    BE2017 / 5008
    Even more preferably, the load on the secondary vacuum pump 10 is reduced by the percentage of kl at each step.
    Furthermore, the control unit 3 preferably first reduces the load on the secondary vacuum pump 10, which is part of the group with the lowest priority and which has the highest number of operating hours.
    If, preferably after the waiting time interval, t2, the pressure, pl, measured at the inlet 11 is still less than the predetermined pressure value, pO, the control unit 3 reduces the load of the secondary vacuum pump 10 by the next highest number operating hours, which is part of the same group. If the load on all secondary vacuum pumps 10 that are part of such a group has been reduced, the control unit 3 will apply the same logic to the group with the next lowest priority.
    Preferably, the steps are repeated until the pressure value, p1, measured at the inlet 11 is equal to or higher than the predetermined pressure value, p0.
    However, such a logic should not be considered limiting since the control unit 3 may also first reduce the load on the secondary vacuum pumps 10 that are part of the highest priority group and proceed with the secondary vacuum pumps 10 that are part of the group with the highest priority. subsequent highest priority.
    BE2017 / 5008
    In another embodiment of the present invention, the control unit 3 reduces the load on all secondary vacuum pumps 10 having a variable speed motor by k.1 whenever the pressure, pl, measured at the inlet 11 is higher than the predetermined pressure value, pO, or until the current operating load, Ssecundair, is equal to the second predetermined start-load, s s tart, 2. The load can be reduced for all secondary vacuum pumps 10 simultaneously, or by selecting one secondary vacuum pump 10 at a time.
    In another embodiment according to the present invention, the control unit 3 first reduces the load of the secondary vacuum pumps 10, and only after reaching each of the secondary vacuum pumps 7 an operating load which is equal to the second predetermined start-load, S s tart, 2, and the pressure, pl, measured at the inlet 11 is still lower than the predetermined pressure value, pO, the control unit gradually decreases the load of the primary vacuum pump 9 with pressure, pl, measured at the inlet 11 is equal to the predetermined pressure value, pO , load on the primary vacuum pump reached minimum load, S min, 1.
    with kO, till the is On or higher po, or till the 9 the first
    In a preferred embodiment, the system applies a wait interval, tl or t2, to operate before a vacuum pump 2, both to: Reduce (t2) and increase (tl) the load
    BE2017 / 5008
    Preferably, as illustrated in Figure 2, after the predetermined pressure value, pO, has been communicated to the control unit 3, the control unit 3 creates five virtual pressure zones: Zone zero to Zone four, between the absolute maximum value 13 of the pressure pl generated by the vacuum pump system 1 at the inlet 11 can be achieved and the absolute minimum value 14 of the pressure pl that can be achieved by the vacuum pump system 1 at the inlet 11. Preferably, the predetermined pressure value, pO, is positioned in the middle zone, Zone two, indicated by 15 in Figure 2.
    The control unit 3 further defines different waiting time intervals t1 and t2 for each of the five zones. Preferably, the waiting time intervals, t1 and t2 have lower values for Zone zero and Zone four than for Zone one and Zone three.
    Preferably, the waiting time intervals t1 and t2 do not apply within Zone two, since the predetermined pressure value, p0, is achieved.
    It should further be assumed that if the modulus of the difference ΔΡ = Ipl - pO 1 falls within Zone four or Zone three, the control unit will either Decrease the load of the vacuum pumps 2 or stop a vacuum pump 2, and therefore t2 used as a waiting time interval.
    If the modulus of the difference ΔΡ = Ipl ~ p0 | within Zone zero or Zone one, the control unit 3 will increase the load on the vacuum pumps 2 or a vacuum pump 2
    BE2017 / 5008 will start, and will therefore use tl as a waiting time interval.
    For ease of calculations, but not limited to, tl selected for Zone zero is approximately equal to t2 selected for Zone four, and tl selected for Zone one is approximately equal to t2 selected for Zone three.
    For example, but not limited to, tl and t2 selected for Zone zero and Zone four, respectively, can be selected at about 10 seconds, and tl and t2 selected for Zone one, and Zone three, respectively, can be selected at about 20 seconds or about 30 seconds . It is further to be understood that the above-mentioned waiting time intervals are not limitative of the present invention, and that other values are also possible. Another possibility is that t1 and t2 differ slightly from each other in Zone zero and Zone four, as well as in Zone one and Zone three, respectively.
    In another embodiment of the present invention, the five virtual pressure zones: Zone zero to Zone four are selected depending on the capacity of the buffer tank 6. Consequently, if the buffer tank 6 has a relatively high capacity, the virtual pressure zones: Zone zero to Zone four are smaller, while if the buffer tank 6 has a relatively low capacity, the virtual pressure zones: Zone zero to Zone four will be larger.
    BE2017 / 5008
    If, after the load of all secondary vacuum pumps has been reduced to the second predetermined starting load, S starts f 2 / the pressure, pl, measured at the inlet, is still lower than the predetermined pressure value, pO, the control unit 3 stops the secondary vacuum pump 10 which has the most operating hours of the group to which the lowest priority is assigned.
    If the pressure, pl, measured at the inlet 11 is still lower than the predetermined pressure value, pO, the control unit 3 then preferably stops another, still running, secondary vacuum pump 10 with the second highest number of operating hours, the secondary vacuum pump 10 belongs to the same group to which the lowest priority is assigned. If such a group does not have another secondary vacuum pump 10 that can be stopped, the control unit 3 stops a secondary vacuum pump 10 which is part of the group to which the next lowest priority is assigned.
    Furthermore, the control unit 3 applies the same logic until the pressure, pl, measured at the inlet 11 is equal to or higher than the predetermined pressure value, pO, or until all secondary vacuum pumps 10 are stopped.
    If a group includes both: both secondary vacuum pumps 10 having a fixed speed motor and secondary vacuum pumps 10 having a variable speed motor, the control unit 3 will preferably first decrease the load of all secondary vacuum pumps 10 of
    BE2017 / 5008 the full vacuum pump system 1 having a variable speed motor, and then stop the secondary vacuum pump 10 having the highest operating hours of the group to which the lowest priority is assigned, regardless of whether such secondary vacuum pump 10 has a fixed speed motor speed or a variable speed motor.
    In another embodiment of the present invention, if after all the secondary vacuum pumps 10 have been stopped, the pressure, pl, measured at the inlet 11 is still less than the predetermined pressure value, pO, the control unit 3 stops the primary vacuum pump 9.
    In another embodiment of the present invention, if the pressure, pl, measured at the inlet 11 is less than the predetermined pressure value, pO, and the control unit 3 has previously already reduced the load of all secondary vacuum pumps 10 to the second predetermined starting load, s s tart, 2, 3, the control unit preferably performs a comparison for all of the vacuum pumps 2 which form part of the vacuum pumping system 1, in order to identify the vacuum pump 2, which has the highest number of operating hours. The control unit 3 then stops such vacuum pump 2.
    In yet another embodiment of the present invention, if the pressure, pl, measured at the inlet 11 is less than the predetermined pressure value, pO, and the control unit 3 previously already loads all
    BE2017 / 5008 secondary vacuum pump 10 has lowered to the second predetermined start-load, S s tart, 2, the controller 3 preferably performs a comparison for aile vacuum pumps 2 which are part of the group to which is assigned the lowest priority. The control unit 3 identifies and stops the vacuum pump 2 with the highest number of operating hours that is part of that group.
    If that vacuum pump 2 was previously identified as being the primary vacuum pump 9, the control unit identifies the vacuum pump 2 with the lowest number of operating hours that is part of the highest priority group among the running vacuum pumps 2 as the new primary vacuum pump 9 .
    In another embodiment of the present invention, but not limited to, the control unit 3 can identify the vacuum pump 2 with the lowest number of operating hours of the group with the lowest priority assigned as the new primary vacuum pump 9.
    Preferably, the control unit 3 ensures that the newly identified primary vacuum pump 9 corresponds in load to the previous primary vacuum pump 9.
    The step is repeated until the pressure, pl, measured at the inlet 11 is equal to or higher than the predetermined pressure value, pO, or until only the primary vacuum pump 9 is running.
    5
    BE2017 / 5008
    In addition, it is understood that, during stable operation of the vacuum pump system 1, in which the pressure value, pl, at the inlet 11 corresponds to the predetermined pressure value, pO, the load of the vacuum pumps 2 is not changed by the control unit 3 and no of the vacuum pumps 2 is stopped or started.
    In a preferred embodiment of the present invention, if the group in which the primary vacuum pump 9 is incorporated comprises more than one vacuum pump 2, the control unit 3 preferably monitors the number of operating hours of such vacuum pumps 2 and if the primary vacuum pump 9 has more operating hours than one of the vacuum pumps 2 forming part of the same group, the control unit 3 changes the primary vacuum pump 9 as being the pump with the least number of operating hours.
    It is preferred that once the priorities are assigned to each of the vacuum pumps 2 that are part of the vacuum pump system 1, such priorities are not changed during the operation of the vacuum pump system 1 and can only be changed before a subsequent start-up of the vacuum pump system 1.
    If, during operation of the vacuum pump system 1, the pressure value, pl, at the inlet 11 corresponds to the predetermined pressure value, pO, and the flow demand to the user network increases, the control unit 3 preferably increases the load of a vacuum pump 2 which is a engine
    BE2017 / 5008 with variable speed. Such a vacuum pump 2 can be either the primary vacuum pump 9, if the primary vacuum pump 2 is not running on a first maximum load, S ma x, i, or the vacuum pump 2 can be a secondary vacuum pump 10, the secondary vacuum pump 10 not running on a second maximum load, S ma5i , 2.
    By way of example, it is further described how the secondary vacuum pumps 10 that are part of a group are operated, and more specifically, the order in which the secondary vacuum pumps 10 are stopped. For the purposes of this example, such a group is the group that has the lowest priority.
    Consequently, we assume that such a group includes an N number of secondary vacuum pumps 10.
    If the pressure, pl, as measured at the inlet 11 is lower than the predetermined pressure value, pO, preferably after the control unit 3 has reduced the load of the primary vacuum pump 9 to the load, S s tart, o, and preferably after the control unit 3 has lowered the load of all the secondary vacuum pumps 10 to the second predetermined start-load, s s tart, 2, the control unit identifies the secondary vacuum pump 10, which is part of the group, which has the highest number of operating hours, and stops said secondary vacuum pump 10.
    If the pressure, pl, measured at the inlet 11 is still lower than the predetermined pressure value, pO, the control unit 3 identifies which of the N-1 remaining rotating
    BE2017 / 5008 vacuum pumps 10, which are part of the group, the pump is with the highest number of operating hours and stops that secondary vacuum pump 10.
    The step is repeated until the pressure, pi, measured at the inlet 11 is equal to or higher than the predetermined pressure value, pO, or in other words until the pressure pi falls within Zone two, as illustrated in Figure 2, or until all secondary vacuum pumps 10 that are part of the group are stopped.
    If, after all the secondary vacuum pumps 10 that are part of that group have stopped and the pressure, pi, measured at the inlet 11, is still lower than the predetermined pressure value, pO, the control unit 3 selects the group to which the lowest priority is assigned , from the other groups and applies the same logic as defined above.
    The step is repeated until the pressure, pi, measured at the inlet 11 is equal to or higher than the predetermined pressure value, pO, or falls within Zone two, as illustrated in Figure 2, or until all secondary vacuum pumps 10 of all groups , have stopped.
    It should be assumed that a reverse logic applies to starting the secondary vacuum pumps. Consequently, if the pressure, pi, measured at the inlet 11 is higher than the predetermined pressure value, pO, the control unit 3 identifies the secondary vacuum pump 10 which has the least number of operating hours from the group with the highest
    BE2017 / 5008 priority is assigned and starts the secondary vacuum pump 10 at a first predetermined starting load, S s tart, i, if the secondary vacuum pump 10 comprises a fixed speed motor, or at a second predetermined starting load, S s tart, 2 if the secondary vacuum pump 10 includes a variable speed motor. The control unit 3 preferably applies a waiting time interval t1 before it starts a secondary vacuum pump 10. Where such a waiting time interval, t1, preferably starts when the control unit 3 detects that the pressure, pl, measured at the inlet 11 is higher than the predetermined pressure value, pO. The control unit will start a secondary vacuum pump 10 if the pressure value, pl, measured at the inlet 11 is still higher than the predetermined pressure value, pO, after the waiting time interval, t1.
    Furthermore, the control unit 3 preferably applies a waiting time interval t2 before it stops a secondary vacuum pump 10. Where such a waiting time interval, t2, starts when the control unit 3 detects that the pressure, pl, measured at the inlet 11 is less than the predetermined pressure value, pO. The control unit 3 will stop a secondary vacuum pump 10 if the pressure value, pl, measured at the inlet 11 is still less than the predetermined pressure value, pO, after the waiting time interval, t2.
    In a preferred embodiment of the present invention, the user of the vacuum pump system 1 selects the value of the second
    BE2017 / 5008 minimum load, S m in, 2 for the vacuum pump system 1 is started. Consequently, if the second minimum load, Smin, 2, is selected at a relatively higher value, the maintenance of the vacuum pumps 2 is optimized, since a better control of the number of operating hours is possible. If the second minimum load, S m in, 2, is selected at a relatively lower value, the energy consumption of the vacuum pump system 1 is optimized.
    This allows the vacuum pump system 1 of the present invention to be adapted according to user requirements, and depending on the geographic location and accessibility or electricity price, the vacuum pump system 1 can be adjusted to provide the most efficient results.
    The present invention is further directed to a vacuum pump system comprising: a primary vacuum pump 9 comprising a variable speed motor capable of running between a first minimum load, S m in, i, and a first maximum load, S max , i. The vacuum pump system 1 further comprises at least two secondary vacuum pumps 10 connected in parallel with the primary vacuum pump 9, each of the at least two secondary vacuum pumps 10 comprising a motor capable of running between a second minimum load, S m in, 2, and a second maximum load, 5 ^, 240
    BE2017 / 5008
    Furthermore, a pressure sensor 12 is provided (not shown) for measuring the inlet pressure, pl, of the vacuum pump system 1 at an inlet 11 thereof, and control means comprising communication means for communicating with one or more of: the primary vacuum pump 9 and at least two secondary vacuum pumps 10.
    Preferably, the control means further comprise processing means comprising an algorithm configured to implement the method of the present invention.
    Those control means can be in the form of a control unit 3, the control unit 3 being part of the vacuum pump system 1 or part of an external computer unit or of a cloud. Where the external computer unit receives the measurement data from the vacuum pump system 1 and sends data back to the vacuum pump system 1 via a communication medium which can be either a wired communication medium or a wireless communication medium.
    In an embodiment according to the present invention, the processing means can be in the form of a processor, part of the control unit 3, or the processing means can be part of an external computer unit or the cloud.
    Preferably, but not limited to, the control unit 3 is part of the vacuum pump system 1.
    BE2017 / 5008
    In another embodiment of the present invention, the communication means can be performed either via a wired or a wireless communication medium. Preferably, the communication means are performed via a wire-bound communication medium.
    Furthermore, the control unit 3 can communicate with the primary vacuum pump 9, and the primary vacuum pump 9 can further communicate with the secondary vacuum pumps 10 through a local control unit (not shown).
    In another embodiment, the control unit 3 can communicate with all vacuum pumps 2 of the vacuum pump system 1, in which case all vacuum pumps 2 preferably comprise a local control unit.
    In yet another embodiment, the vacuum pump system 1 further comprises a user interface (not shown) through which a user of such a system can manually select at least one or even all of the following parameters: the predetermined pressure value, pO, the load S s tart , o, at which the primary vacuum pump 9 is started, the percentage, kO, by which the load of the primary vacuum pump 9 is increased, the first predetermined starting bias, S s tart, i, the second predetermined starting bias, S s tart , 2, the percentage, kl, by which the load of the secondary vacuum pumps 10 is increased or decreased, waiting time intervals t1 and t2 for each of the five
    BE2017 / 5008 virtual zones: Zone zero to Zone four to stop or start a secondary vacuum pump 10, and whether he prefers the vacuum pump system 1 to run either in an energy ™ efficient mode or in a maintenance efficient mode.
    In a preferred embodiment of the present invention, the at least two secondary vacuum pumps 10 each comprise either a variable speed motor or a fixed speed motor.
    More preferably, at least one of the motors is a variable speed motor.
    Even more preferably, all secondary vacuum pumps 10 comprise a variable speed motor.
    Preferably at least one of the primary vacuum pump 9 and the secondary vacuum pumps 10 is an oil injection screw vacuum pump.
    In another preferred embodiment of the present invention, all vacuum pumps 2 that are part of the vacuum pump system 1 are screw vacuum pumps with oil injection.
    The present invention should not be limited to comprising only oil injection screw vacuum pumps but it should be assumed that the method of the present invention can be applied to any type of vacuum pump which has a SER curve (specific energy consumption) similar to that illustrated
    BE2017 / 5008 in Figure 3, where the SER curve indicates that the vacuum pump 2 achieves a lower 3 FR value at low speeds compared to the SER value at higher speeds.
    The present invention is by no means limited to the exemplary embodiments described and shown in the figures, but such a vacuum pump system 1 can be realized in various variants without departing from the scope of the invention. Nor is the invention limited to the method of operating a vacuum pump system described by way of example, but the method can be practiced in all kinds of Variants without departing from the scope of the invention.
    BE2017 / 5008
    权利要求:
    Claims (15)
    [1]
    Conclusions.
    A method of operating a vacuum pump system, the method comprising the steps of:
    - operating a primary vacuum pump (9} comprising a variable speed motor;
    - parallel connection of at least two secondary vacuum pumps (10) and the primary vacuum pump (9), each of the at least two secondary vacuum pumps (10) comprising a fixed-speed motor or a variable-speed motor
    - dividing the secondary vacuum pumps (10) into groups, each group comprising at least one secondary vacuum pump (10);
    - allocating 6ΘΠ priority each from That groups; characterized by it Which the method further the includes steps from: - performing a first measurement from the pressure (pl) measured at t an inlet (11 ) from it vacuum pump system ( D;
    - comparing the first measured inlet pressure (pl) with a predetermined pressure value (pO) and,
    BE2017 / 5008 if the measured inlet pressure (pl) is higher than the predetermined pressure value (pO), operating the at least one secondary vacuum pump (3.0) that is part of the group to which the highest priority has been assigned;
    - making a second measurement of the inlet pressure (p1) at the inlet (11) of the vacuum pump system (1);
    - comparing the second measured inlet pressure (pl) with the predetermined pressure value (pO) and, if the second measured inlet pressure (pl) is higher than the predetermined pressure value (pO), operating the at least one secondary vacuum pump (10 ) of the group to which the second highest priority is assigned, wherein the method further comprises the step of starting of the secondary vacuum pump (10) at a first predetermined start load (s s tart, i) if they have a motor with a fixed speed comprises , and / or comprises the starting of the secondary vacuum pump (10) at a second predetermined start load (s tart s, 2), and the secondary vacuum pump (10) is a variable speed motor.
    [2]
    Method according to claim 1, characterized in that the method repeats the step of comparing the measured inlet pressure (pl) with the predetermined pressure value (pO), and if, the subsequently measured pressure (pl) is higher than the predetermined pressure particular
    BE2017 / 5008 pressure value (pO), operating the at least one secondary vacuum pump (10) that is part of the group that has been assigned a subsequent highest priority, until the pressure (pl), measured
    5 at the inlet (11) reaches the value of the predetermined pressure value (pO), or until all secondary vacuum pumps (10) are running.
    [3]
    Method according to claim 1 or 2, characterized in that operating at least one
    10 secondary vacuum pump (10) that is part of the highest priority group is done by starting one secondary vacuum pump (10) at a time, and if the measured inlet pressure (pl) is higher than the predetermined pressure value (pO), the vacuum pump system starts
    (1) another secondary vacuum pump (10) that is part of the same highest priority group or, if all the secondary vacuum pumps (10) of the highest priority group are running, the method further comprises the step of starting a
    20 secondary vacuum pump (10), which is part of the group with the second highest priority.
    [4]
    Method according to claim 3, characterized in that operating at least one secondary vacuum pump (10) which is part of the group with the
    25 second highest priority is done by starting one secondary vacuum pump (10) at a time, and if the measured inlet pressure (pl) is higher than the predetermined pressure value (pO), the vacuum pump system starts
    BE2017 / 5008 (1) another secondary vacuum pump (10) that is part of the same group with the second highest priority or, if all the secondary vacuum pumps (10) of the group with the second highest priority are running, the method further comprises the step of starting a secondary vacuum pump (10), which is part of the next highest priority group.
    [5]
    The method of any preceding claim, further comprising the step of measuring the pressure (pi) at the inlet (11) of the vacuum pump system (1) and comparing the measured inlet pressure (pi) with the predetermined pressure value (pO) after a! jds interval.
    [6]
    The method of claim 5, further comprising the step of increasing the load of a secondary vacuum pump (10) comprising a variable speed motor to a first operating load (S operation, i) selected between the second predetermined starting load (S s tart, 2) and a predetermined second maximum load (S m ax, 2) of the secondary vacuum pumps (10), if all secondary vacuum pumps (10) are running and the measured inlet pressure (pl) is higher than the predetermined pressure value (pO).
    [7]
    A method according to claim 6, characterized in that the method further comprises the step of increasing the load on each of the secondary
    BE2017 / 5008 vacuum pumps (10) that include a variable speed motor up to a first operating load (S operation, i) in the order of the assigned priority, if the measured inlet pressure (pl) is higher than the predetermined pressure value (pO).
    [8]
    The method of claim 6 or Ί, further comprising decreasing the load of a secondary vacuum pump (10), the secondary vacuum pump (10) comprising a variable speed motor from a current operating load (Secondary) to the second predetermined starting load (S s tart, 2.), if the measured inlet pressure (pl) is lower than the predetermined pressure value (pO).
    [9]
    The method of claim 8, further comprising stopping the secondary vacuum pump (10) having the most operating hours of the group to which the lowest priority is assigned, if the measured inlet pressure (pl) is less than the predetermined pressure value (pO ).
    [10]
    The method of claim 9, further comprising subsequently stopping another secondary vacuum pump (10) still in operation having the second highest number of operating hours if the measured inlet pressure (pl) is less than the predetermined pressure value (pO) , with the secondary vacuum pump (10) having the second highest number
    BE2017 / 5008 has operating hours and is part of the group with the lowest priority.
    [11]
    A vacuum pump system comprising:
    - a primary vacuum pump (9) comprising a variable speed motor;
    - at least two secondary vacuum pumps (10) connected in parallel with the primary vacuum pump (9), each of the at least two secondary vacuum pumps (10) comprising a fixed speed motor or a variable speed motor;
    ~ a pressure sensor (12) to measure the inlet pressure (pl) of the vacuum pump system (l) at an inlet (11) thereof;
    control means comprising communication means for
    to communicate with a or more of: the primary vacuum pump (9) and at least two secondary vacuum pumps (10);
    characterized in that the control means further comprises processing means comprising an algorithm configured to apply the method according to any one of claims 1 to 11.
    [12]
    Vacuum pump system according to claim 11, characterized in that the communication means are of a corded type.
    5 0
    BE2017 / 5008
    [13]
    Vacuum pump system according to claim 11 or 12, characterized in that the at least two secondary vacuum pumps (10) each comprise a motor.
    [14]
    Vacuum pump system according to claim 13, therefore
    5 characterized in that at least one of the motors is a variable speed motor.
    [15]
    Vacuum pump system according to claim 11, characterized in that at least one of the primary vacuum pump (9} and the secondary vacuum pumps (10) is an oil injection screw vacuum pump.
    BE2017 / 5008
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    同族专利:
    公开号 | 公开日
    ES2803873T3|2021-02-01|
    EP3420233A1|2019-01-02|
    EP3420233B1|2020-04-22|
    BE1024411A1|2018-02-08|
    US20190055945A1|2019-02-21|
    US11111922B2|2021-09-07|
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    法律状态:
    2018-03-07| FG| Patent granted|Effective date: 20180212 |
    优先权:
    申请号 | 申请日 | 专利标题
    US201662298788P| true| 2016-02-23|2016-02-23|
    US62/298,788|2016-02-23|ES17717067T| ES2803873T3|2016-02-23|2017-02-13|Method of operating a vacuum pump system and a vacuum pump system applying such method|
    PCT/BE2017/000014| WO2017143410A1|2016-02-23|2017-02-13|Method for operating a vacuum pump system and vacuum pump system applying such method|
    EP17717067.7A| EP3420233B1|2016-02-23|2017-02-13|Method for operating a vacuum pump system and vacuum pump system applying such method|
    US16/077,780| US11111922B2|2016-02-23|2017-02-13|Method for operating a vacuum pump system and vacuum pump system applying such method|
    CN201710205850.9A| CN107100832B|2016-02-23|2017-02-23|Run the method for vacuum pump system and the vacuum pump system using this method|
    US17/391,086| US20210404469A1|2016-02-23|2021-08-02|Method for operating a vacuum pump system and vacuum pump system applying such method|
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