• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for detecting a blocked valve of a refrigerant compressor (1) having a drive unit (4) and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit (4) comprises an electric motor for driving the piston-cylinder unit, wherein the Speed (w) of the electric motor is monitored. According to the invention, it is provided that initially a maximum rotational speed (wmax) of the electric motor is detected and that the following steps are carried out as long as the rotational speed (w) of the electric motor essentially corresponds to the maximum rotational speed (wmax): determination of a maximum value Xmax of a monitoring parameter (I, T) of the refrigerant compressor (1); - determining a value Xt1 of the monitoring parameter (I, T) after a first period of time (t1) after determining the maximum value Xmax; - Detection of a blocked valve, if Xt1 is less than Xmax and (Xmax - Xt1) / Xmax ≥ DX, where DX is specified.
    公开号:AT518199A1
    申请号:T8014/2016
    申请日:2016-01-18
    公开日:2017-08-15
    发明作者:
    申请人:Secop Gmbh；
    IPC主号:
    专利说明:

    METHOD FOR DETECTING A BLOCKED VALVE OF A REFRIGERANT COMPRESSOR AND A CONTROL SYSTEM FOR ONE
    REFRIGERANT COMPRESSOR
    FIELD OF THE INVENTION
    The present invention relates to a method for detecting a blocked valve of a refrigerant compressor having a drive unit and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit comprises an electric motor for driving the piston-cylinder unit, wherein the rotational speed of the electric motor monitors becomes.
    Furthermore, the present invention relates to a control system for a refrigerant compressor, the refrigerant compressor comprising a drive unit and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit comprises an electric motor for driving the piston-cylinder unit and wherein the control system comprises control electronics ,
    STATE OF THE ART
    In a refrigerant compressor having a drive unit and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit comprises an electric motor for driving the piston-cylinder unit and wherein the
    Speed of the electric motor is controlled, there is a possible error condition in a blocked valve. This may in particular be a blocked suction or pressure valve. In practice, however, it is also possible to use e.g. a solenoid valve in the cooling circuit is defective, which solenoid valve does not necessarily have to be part of the refrigerant compressor.
    The blocked valve in any case has the consequence that refrigerant in the cooling circuit is no longer transported in the extent required for cooling or not at all and therefore cooling can no longer take place. The driving the refrigerant compressor
    Application device, e.g. a refrigerator, determines that the temperature does not drop, and then usually regulates the refrigerant compressor to maximum cooling capacity, so that the electric motor runs at maximum speed - of course, without success, because the coolant in the cooling circuit can not be transported.
    Even if originally the cause of the blockage of the cooling circuit was not a blocked valve of the refrigerant compressor, the valve, in particular the pressure valve of the refrigerant compressor, is blocked at the latest now. This is because, due to the further operation of the compressor at the highest power level of the back pressure of the refrigerant in the pressure section increases so far that the pressure valve does not open, because the pressure built up by the refrigerant compressor is no longer sufficient for this. In general, there is always at least a blockage of the pressure valve when the back pressure is high enough - regardless of how this back pressure is achieved or generated.
    In order to prevent the refrigerant compressor from continuing to run at high speed due to the fault condition, it is known in the art to measure the increase in the temperature of the compressor, e.g. above a certain limit temperature, to be defined as a termination condition. That the temperature is constantly monitored, and when the limit temperature is exceeded and the electric motor preferably runs at maximum speed, the electric motor is turned off.
    A disadvantage of this known method is that it does not work for all refrigerant compressors. The practice shows that depending on the design or type of refrigerant compressor, the temperature sometimes does not rise far enough to be able to determine a limit temperature meaningful.
    OBJECT OF THE INVENTION
    It is therefore an object of the present invention to provide a method that enables the reliable detection of a blockage condition or a blocked valve of the compressor. Accordingly, it is a further object of the invention to provide a control system for a refrigerant compressor which enables reliable detection of a blockage condition of a compressor, in order to be able to set countermeasures.
    PRESENTATION OF THE INVENTION
    Elaborate series of experiments with different types of refrigerant compressors, each having a drive unit and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit has an electric motor for driving the piston-cylinder unit and wherein the rotational speed of the electric motor is monitored have demonstrated that the drastically reduced or even completely stalled mass flow which occurs in a blockage state or in the case of a blocked valve can lead to certain monitoring parameters initially increasing in their value and reaching a maximum value, but then within a certain range, preferably predetermined time period decrease again, while the electric motor continues to run at maximum speed.
    Here and below, the term "maximum speed" always means that maximum speed that the refrigerant compressor or electric motor actually achieves in the current cooling circuit. For various reasons, this maximum speed may deviate from a theoretically technically possible maximum rotational speed of the electric motor, for example because of noise the application device, the theoretically technically possible maximum speed of eg 4000 min-1 does not exploit or request, but as a "target maximum speed" a lower speed of eg 3600 min-1. Furthermore, various external circumstances, such as Too low supply voltage, cause the target maximum speed (and of course the theoretically technically possible maximum speed of the electric motor) is not reached, so that the maximum speed actually lower than the target maximum speed (and of course as the theoretically technically possible maximum Speed of the electric motor) is.
    A typical monitoring parameter would be the current drawn by the electric motor which, after rising to a maximum, e.g. 0.85 A, within a certain period of time to a certain value - e.g. to 0.425 A - decreases while the electric motor is constantly running at maximum speed.
    As a decisive criterion for the presence of a blocked valve can therefore be used that the decrease of the monitoring parameter within the certain period of time is "large enough", which size depends on the respective type of refrigerant compressor and can be determined by a laboratory experiment and then specified accordingly.
    Accordingly, in a method of detecting a blocked valve of a refrigerant compressor having a drive unit and a piston-cylinder unit for cyclically compressing a refrigerant, the drive unit includes an electric motor for driving the piston-cylinder unit, wherein the rotational speed of the electric motor is monitored is inventively provided that first a maximum speed of the electric motor is detected and that the following steps are performed as long as the speed of the electric motor substantially corresponds to the maximum speed: - Determining a maximum value Xmax a monitoring parameter of the refrigerant compressor; - Determining a value Xti of the monitoring parameter after a first period of time after the determination of the maximum value Xmax r - Detection of a blocked valve, if Xti is less than Xmax and (Xmax - Xti) / Xmax - Δχ, where Δχ is given.
    In particular, the blocked valve may be a blocked suction or pressure valve. In practice, however, the blockage condition may also be due to another defective element in the refrigeration cycle, such as e.g. a solenoid valve, which element does not necessarily have to be part of the refrigerant compressor. As already described above, this generally results in a blocked valve of the refrigerant compressor, in particular a blocked pressure valve of the refrigerant compressor in the blocked state, wherein the blocked valve blocks the mass flow of the refrigerant largely, preferably completely.
    The continued running of the electric motor with maximum speed is in the application by a coolant compressor driving application device, e.g. by a refrigerator, because the application device determines that the desired cooling does not occur and thus continues to require maximum cooling capacity. A typical value for the maximum speed would be 3000 RPM to 4000 RPM. It should be noted that it is clearly a refrigerant compressor with variable speed, otherwise only a single speed would be provided in the operation of the refrigerant compressor, which then also represented the maximum speed.
    Certain minimal variations in speed are unavoidable in practice. Therefore, it makes sense to assume a certain tolerance range around the maximum speed value, typically a maximum of ± 2%. If the speed changes so that it deviates more strongly from the maximum speed value, in particular by more than 2% less than the maximum speed value, the process is interrupted. In the case of an increasing speed, the actual maximum speed value had not yet been reached, and the procedure is usually restarted when the actual maximum speed value is reached.
    In the case of a falling speed is typically assumed that the blocking situation or the blocked valve was no longer available, it could thus come to the desired cooling and the application device requested a lower cooling capacity. The process is thus interrupted and only restarted when the maximum speed is reached again.
    As already noted, the extent to which the monitoring parameter decreases over time depends on the particular type of refrigerant compressor. It is provided in a preferred embodiment of the method according to the invention that Δχ> 0.2, preferably Δχ> 0.4, more preferably Δχ> 0.5 applies. That the percentage decrease in the value of the monitoring parameter must be at least 20%, preferably at least 40%, more preferably at least 50%.
    As already stated, the monitoring parameter which has the described temporal behavior in the blockade state can be the current consumed by the electric motor. Similarly, a motor winding temperature and a temperature of a control electronics of the electric motor or the refrigerant compressor have the same
    Temperature behavior, which is why these temperatures are ideal as monitoring parameters. In a preferred embodiment of the method according to the invention, it is therefore provided that the monitoring parameter is a current absorbed by the electric motor or a temperature of a control electronics of the refrigerant compressor, in particular of the electric motor, or of a motor winding of the electric motor. Clearly, these temperatures should always be given relative to the ambient temperature of the refrigerant compressor. For example, if the ambient temperature is 20 ° C (room temperature) and the maximum value of the temperature is 90 ° C, 70 ° C should be used for Xmax.
    As determined in extensive experiments, it is recommended that the determination of the maximum value Xmax not be carried out immediately after the detection of the maximum speed of the electric motor, but hereby to wait a certain, predeterminable time. This allows a certain balance of pressure conditions to be established for which the monitoring parameter can first assume its maximum value Xmax. Otherwise, there is a risk that the value of the monitoring parameter will increase even further until the equilibrium of the pressure conditions is reached. Therefore, it is provided in a preferred embodiment of the method according to the invention that the determination of the maximum value Xmax takes place only after an initiation period after the detection of the maximum speed of the electric motor. In other words, the detection of the maximum speed defines a start time or start time for the method. In the mentioned preferred embodiment, immediately after the start time or after the start time, the initiation time interval is awaited before the determination of the maximum value Xmax of the monitoring parameter is performed.
    The optimal initiation time span can be determined in the trial for different types of refrigerant compressor and then specified accordingly, the
    Initiation period is typically a few minutes. It is therefore provided in a preferred embodiment of the method according to the invention that the initiation period is at least 5 minutes, preferably at least 10 minutes, more preferably at least 15 minutes.
    In order to ensure the greatest possible certainty that the conditions for the blockage condition or for a blocked valve are actually met, a verification can take place in that the monitoring parameter is again determined shortly after its last determination and compared with the maximum value Xmax. Even if this comparison indicates the blockage condition, it can be assumed with very high certainty that the blockage condition or a blocked valve is actually present. Therefore, in a preferred embodiment of the method according to the invention, after a verification period after the detection of the blocked valve, a value Xt2 of the monitoring parameter is determined and the detection of the blocked valve is verified if Xt2 is less than Xmax and (Xmax-Xt2) / Xmax - Δχ applies. Waiting for the verification period should take into account any fluctuations in the monitoring parameter, i. if the value of the monitoring parameter also after the
    Verification period is correspondingly low, it can be assumed with high probability that this reduction is not due to a random fluctuation.
    Of course, particularly preferred embodiments are conceivable in which the condition (Xmax - Xt2) / Xmax - Δχ 'is checked for verification, where Δχ' + Δχ, preferably Δχ '> Δχ applies. That verification is made as to whether the refrigerant compressor monitoring parameter evolves in time as expected by model calculations and / or laboratory testing, and this time evolution will typically be a further decrease.
    The optimal verification period may be determined in trial for different types of refrigerant compressor and then set accordingly, with the verification period typically being no more than a few minutes. Therefore, in a preferred embodiment of the method according to the invention, it is provided that the verification period is 15 s to 5 min, preferably 30 s to 3 min, particularly preferably 45 s to 1 min 30 s.
    The first period of time may also depend on the type of refrigerant compressor and can be specified accordingly, in particular on the basis of experiments carried out. It is provided in a preferred embodiment of the method according to the invention that the first
    Time is at least 3 h, preferably at least 5 h, more preferably at least 6 h.
    In a preferred embodiment of the method according to the invention, it is provided that after detection of the blocked valve, a corresponding error message is written in a readable memory provided therefor. Analogously, it is provided in a preferred embodiment of the method according to the invention that after verification of the detection of the blocked valve, a corresponding error message is written in a space provided, readable memory. The particular write to the read-only memory allows this information to be shared with different control systems - e.g. a control system of the application device - to provide for further processing. Furthermore, especially if it is a non-volatile memory such as e.g. a so-called FLASH, EPROM or NVRAM memory, the information is read out for diagnostic purposes even at a later date.
    In practice, the detection or verification of the blockage or blocked valve can be used to shut off the compressor, since it is clear that in this state, the desired cooling can not be achieved. Continued running of the electric motor to maximum speed would therefore mean unnecessary loading of the compressor as well as unnecessary energy consumption. Accordingly, an operating method for operating a refrigerant compressor is provided according to the invention, the operating method comprising the inventive method, wherein after the detection of the blocked valve, the electric motor is stopped. Analogously, an operating method for operating a refrigerant compressor is provided according to the invention, the operating method comprising the method according to the invention, wherein after the verification of
    Detection of the blocked valve of the electric motor is stopped. Preferably, the electric motor in the stopped state does not absorb electricity, so that no unnecessary energy consumption takes place.
    Experiments have shown that the cause of the blockage situation sometimes no longer exists after a restart of the refrigerant compressor. For example, it could be that a solenoid valve had triggered the blocking situation because it had not opened and thus blocked the cooling circuit, and that this solenoid valve now opens as planned when it is restarted. Therefore, it is provided in a preferred embodiment of the operating method according to the invention that the electric motor is restarted after a second period of time. Waiting for the second period of time can serve to bring about a certain relaxation of the pressure conditions, which can contribute to the release of a blocked valve.
    Furthermore, a temperature of the compressor may also relax during the second time period, which may also contribute to releasing a blocked valve.
    In particular, if the blocking valve has an erratic behavior and blocked accordingly in some runs of the refrigerant compressor and not again in other runs, the second period of time can be kept relatively short, especially in the second range. It is therefore provided in a preferred embodiment of the operating method according to the invention that the second time period is at least 3 s, preferably at least 6 s, particularly preferably at least 15 s. In general, however, it should be noted that the values for the second period may vary widely depending on the application.
    In practice, it makes sense not to let the second period of time be arbitrarily long, because of course
    Error states can occur in which a blocked valve no longer releases. Therefore, it is provided in a particularly preferred embodiment of the operating method according to the invention that the second time period is a maximum of 60 minutes. That it is assumed that the blocking valve must solve within this maximum duration of the second period of time, otherwise it can be assumed that there is a fault condition in which the blocking valve no longer releases.
    Analogous to the above, it is in a control system for a refrigerant compressor, the refrigerant compressor comprising a drive unit and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit comprises an electric motor for driving the piston-cylinder unit and wherein the control system Control electronics, according to the invention provided that the control electronics for implementing a method according to the invention and / or for carrying out an operating method according to the invention is set up.
    Finally, in order to be able to provide a refrigerant compressor which can reliably detect and respond to a stalled valve, it is in a refrigerant compressor having a drive unit and a piston-cylinder unit for cyclically compressing a refrigerant, the drive unit having a Electric motor for driving the piston-cylinder unit, according to the invention provided that the refrigerant compressor comprises a control system according to the invention.
    It should be noted that in all the above embodiments, the refrigerant compressor may be, in particular, a refrigerant compressor with a hermetically sealed housing, wherein the drive unit and the piston-cylinder unit are arranged in the housing.
    BRIEF DESCRIPTION OF THE FIGURES
    The invention will now be explained in more detail with reference to an embodiment. The drawings are exemplary and are intended to illustrate the inventive idea, but in no way restrict it or even reproduce it.
    Showing:
    Fig. 1 is a schematic axonometric view of a refrigerant compressor according to the invention with removed upper housing half
    Fig. 2 is a diagrammatic illustration of the method according to the invention
    WAYS FOR CARRYING OUT THE INVENTION
    Fig. 1 shows a refrigerant compressor 1 according to the invention, wherein a hermetically sealed housing 2 of the refrigerant compressor 1 is only partially shown or an upper half of the housing 2 is removed to allow a view into the housing 2. Inside the housing 2, a cylinder housing 3 of a piston-cylinder unit can be seen. The cylinder housing 3 is mounted on a drive unit 4, which comprises an electric motor for driving the piston-cylinder unit. In this case, the electric motor via a crankshaft 10 and a connecting rod drives a piston of the piston-cylinder unit in a cylinder, which cylinder is arranged in the cylinder housing 3. As a result, a cyclical movement of the piston in the cylinder along a cylinder axis is realized in order to compress refrigerant.
    The refrigerant is sucked via a suction muffler 9 and arranged in a valve plate 6 mammal valve into the cylinder, compressed and passed through a arranged in the valve plate 6 pressure valve in an outwardly leading pressure tube 8. The refrigerant is subsequently conveyed in a refrigerant circuit of an application device, such as e.g. a refrigerator, in which refrigerant circuit of the refrigerant compressor 1 is incorporated, to a condenser (not shown) passed.
    The valve plate 6 is mounted on the cylinder in the region of a cylinder head, wherein in Fig. 1, a cylinder cover 5 can be seen, which is screwed by means of screws 7 with the cylinder. The valve plate 6 is arranged between the cylinder cover 5 and the cylinder.
    The refrigerant compressor 1 is operated at variable speed CO, i. the speed CO of the electric motor is dependent on the cooling capacity requested by the application device. At maximum cooling capacity, the electric motor runs at a maximum speed COmax / · which is typically 3000 min-1 to 4000 min-1.
    In a blockage state, the mass flow of the refrigerant in the cooling circuit is greatly reduced or comes to a complete standstill. The blockage condition can be caused by a blocked valve of the refrigerant compressor 1 or leads to a blocked valve of the refrigerant compressor 1, since the valve, in particular the pressure valve, can no longer open properly due to the build-up pressure conditions. The latter means that the pressure built up by the piston-cylinder unit is not large enough to overcome the back pressure built up due to the blockage condition.
    In order to be able to reliably detect the blockage condition or a blocked valve, it is provided according to the invention that in addition to the rotational speed CO, monitoring parameters of the refrigerant compressor 1 are monitored continuously in order to determine their time profile. In particular, a current I picked up by the electric motor and a temperature T of control electronics of the refrigerant compressor 1 or the electric motor or a motor winding of the electric motor are possible monitoring parameters. Clearly, these temperatures should always be given relative to the ambient temperature (typically room temperature or 20 ° C) of the refrigerant compressor.
    According to the following steps are performed after detection of the maximum speed Cömax, as long as the speed CO of the electric motor substantially corresponds to the maximum speed Cömax: - Determining a maximum value Xmax of the monitoring parameter of the refrigerant compressor 1; Determining a value Xti of the monitoring parameter after a first period of time tl after determining the maximum value Xmax; - Detection of a blocked valve, if Xti is less than Xmax and (Xmax - Xti) / Xmax - Δχ, where Δχ is specified.
    FIG. 2 illustrates these method steps on the basis of the diagrammatic representation of the course of I or T as a function of time t. Directly below this diagram, the time course of the speed CO of the electric motor is shown. In this case, in the illustrated embodiment of the method according to the invention, after the first detection of the maximum speed Cömax, first a predefinable initiation time interval t0 is waited for, so that a certain equilibrium of the pressure ratios can be established before Xmax is determined. Typically, tO is at least 5 minutes, preferably at least 10 minutes, more preferably at least 15 minutes.
    In a typical application analogous to Fig. 2, e.g. the current I has risen to a value of Xmax = 0.85A after the initiation time tO. Similarly, in such a typical application, the temperature T after the initiation period tO has risen to a value e.g. Xmax = 70 ° C (equivalent to measured 90 ° C at 20 ° C ambient temperature).
    The determination of Xti takes place after the expiry of the first time interval t1 after the determination of Xmax, where t1 is typically at least 3 h, preferably at least 5 h, particularly preferably at least 6 h. That the time elapsed between the first detection of the maximum speed COmax and the determination of Xti is t0 + t1. In a typical application analogous to FIG. 2, the current I has dropped to a value of Xti = 0.425 A after the first time interval t 1 or, for example, to a value equivalent to a relative reduction of 20% to 50%. Similarly, in such a typical application, the temperature T after the first time period tl has dropped to a value e.g.
    Xti = 50 ° C (equivalent to measured 70 ° C at 20 ° C ambient temperature).
    Depending on the type of refrigerant compressor 1, a specific value for Δχ can be specified, wherein typically Δχ> 0.2, preferably Δχ> 0.4, particularly preferably Δχ> 0.5 applies. The value suitable for the respective type can preferably be determined in a laboratory experiment. In the illustrated embodiment of Fig. 2, (Xmax-Xti) / Xmax is λ 0.56. With specification of Δχ = 0.5, therefore, a blocked valve or the blockage condition is detected.
    In the exemplary embodiment of FIG. 2, a verification of the detection of the blocked valve takes place for safety, since after the determination of Xti a relatively short
    Verification period t2 is waited to then again to determine a current value Xt2 of the monitoring parameter and the condition (Xmax - Xt2) / Xmax - Δχ to check. Typically, the verification period t2 is 15 seconds to 5 minutes, preferably 30 seconds to 3 minutes, more preferably 45 seconds to 1 minute 30 seconds.
    In a typical application analogous to FIG. 2, the current I after the verification period t2 is set to a value of e.g. Xt2 = 0.23A dropped. Similarly, in such a typical application, the temperature T after the verification period t2 has dropped to a value e.g. Xt2 = 18.9 ° C (equivalent to measured 38.9 ° C at 20 ° C ambient temperature).
    In the illustrated embodiment of FIG. 2, (Xmax-Xt2) / Xmax is -0.73. That given Δ Vor = 0.5, the previous detection of the blocked valve is thus confirmed or verified.
    To carry out the described method, the refrigerant compressor 1, a control system with a control electronics, which control electronics is set up to carry out said method. Preferably, this control electronics also forms the above-mentioned control electronics of the electric motor.
    In the embodiment of FIG. 2, the control electronics is further configured to carry out an operating method according to the invention, according to which the electric motor is stopped after the verification of the blocked valve or the blocking state. Accordingly falls in the lower diagram of Fig. 2, the speed CO of the maximum speed COmax to 0.
    After stopping the electric motor no longer receives current I, the temperature T of the control electronics or the motor winding, however, slowly decreases (to ambient temperature), which is why in Fig. 2, the course of T in the area after t2 indicated by a dashed line is.
    Since the cause of the blockage situation sometimes no longer exists after a restart of the refrigerant compressor 1, the control electronics may be configured to restart the electric motor after a relatively short second time period t3. Typically, the second time period t3 is only a few seconds, for example at least 3 s, preferably at least 6 s, particularly preferably at least 15 s. In practice, the second period t3 is typically limited to a maximum of up to 60 minutes.
    In the lower diagram of Fig. 2 are indicated by dotted lines different situations after switching on the electric motor. One of these situations would be that the electric motor again runs at the maximum speed COmax, which will be the case in particular if the blockage situation still exists. In such a case, the described method according to the invention for the detection of a blocked valve would be restarted immediately by the detection of the maximum speed COmax.
    In particular, if the blocking situation is no longer present, but can also occur situations in which the speed CO of the electric motor is below the maximum speed α ^ 3Χ. In such a case, the described inventive method for detecting a blocked valve would not be started, but only again as soon as the maximum speed Cömax is subsequently detected.
    It should be noted that the control system may have a memory in which after the detection or
    Verification of Blockadezustands a corresponding error message is written, which error message can then be read from the memory, especially for diagnostic purposes again. Furthermore, the memory can serve for the storage of values to be retrieved during the method or operating method according to the invention, in particular for the storage of the values for Δχ, tO, t1, t2 and t3, for the refrigerant compressor 1 present in a specific manner.
    REFERENCE LIST 1 Refrigerant compressor 2 Housing of the refrigerant compressor 3 Cylinder housing 4 Drive unit 5 Cylinder cover 6 Valve plate 7 Bolt 8 Outward pressure pipe 9 Suction muffler 10 Crankshaft I Electric motor current T Temperature of electric motor control unit or motor motor winding t Time tO Initiation period tl First period t2 Verification period t3 second time period CO speed of the electric motor Cömax maximum speed of the electric motor
    权利要求:
    Claims (17)
    [1]
    1. A method for detecting a blocked valve of a refrigerant compressor (1) with a drive unit (4) and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit (4) comprises an electric motor for driving the piston-cylinder unit, wherein the rotational speed (CO) of the electric motor is monitored, characterized in that first a maximum rotational speed (COmax) of the electric motor is detected and that the following steps are carried out as long as the rotational speed (CO) of the electric motor substantially corresponds to the maximum rotational speed (COmax): - determining a maximum value Xmax of a monitoring parameter (I, T) of the refrigerant compressor (i); - determining a value Xti of the monitoring parameter (I, T) after a first period of time (tl) after determining the maximum value Xmax; - Detection of a blocked valve, if Xti is less than Xmax and (Xmax - Xti) / Xmax ^ Δχ, where Δχ is given.
    [2]
    2. The method according to claim 1, characterized in that Δχ> 0.2, preferably Δχ> 0.4, more preferably Δχ> 0.5 applies.
    [3]
    3. The method according to any one of claims 1 to 2, characterized in that it is the monitoring parameter to a recorded by the electric motor current (I) or to a temperature (T) of a control electronics of the refrigerant compressor (1), in particular of the electric motor, or a motor winding of the electric motor.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the determination of the maximum value Xmax takes place only after an initiation period (tO) after the detection of the maximum speed (COmax) of the electric motor.
    [5]
    5. The method according to claim 4, characterized in that the initiation period (tO) is at least 5 minutes, preferably at least 10 minutes, more preferably at least 15 minutes.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that after a verification period (t2) after the detection of the blocked valve, a value Xt2 of the monitoring parameter (I, T) is determined and the detection of the blocked valve is verified when Xt2 is less than Xmax and (Xmax - Xt2) / Xmax ^ Δχ holds.
    [7]
    7. The method according to claim 6, characterized in that the verification period (t2) is 15 s to 5 min, preferably 30 s to 3 min, more preferably 45 s to 1 min 30 s.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that the first time period (tl) is at least 3 h, preferably at least 5 h, more preferably at least 6 h.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that after the detection of the blocked valve, a corresponding error message is written in a space provided, readable memory.
    [10]
    10. The method according to any one of claims 6 to 9, if dependent on claim 6, characterized in that after the verification of the detection of the blocked valve, a corresponding error message is written in a space provided, readable memory.
    [11]
    11. An operating method for operating a refrigerant compressor (1), the operating method comprising the method according to one of claims 1 to 10, wherein after the detection of the blocked valve, the electric motor is stopped.
    [12]
    12. An operating method for operating a refrigerant compressor (1), the operating method comprising the method according to one of claims 6 to 10, when dependent on claim 6, wherein after the verification of the detection of the blocked valve, the electric motor is stopped.
    [13]
    13. Operating method according to one of claims 11 to 12, characterized in that the electric motor is restarted after a second period of time (t3).
    [14]
    14. Operating method according to claim 13, characterized in that the second time period (t3) is at least 3 s, preferably at least 6 s, particularly preferably at least 15 s.
    [15]
    15. Operating method according to one of claims 13 to 14, characterized in that the second time period (t3) is a maximum of 60 minutes.
    [16]
    16. A control system for a refrigerant compressor (1), the refrigerant compressor (1) comprising a drive unit (4) and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit (4) comprises an electric motor for driving the piston-cylinder unit and wherein the control system has control electronics, characterized in that the control electronics for implementing a method according to one of claims 1 to 10 and / or for carrying out an operating method according to one of claims 11 to 15 is arranged.
    [17]
    17. A refrigerant compressor (1) having a drive unit (4) and a piston-cylinder unit for cyclically compressing a refrigerant, wherein the drive unit (4) has an electric motor for driving the piston-cylinder unit, characterized in that the refrigerant compressor ( 1) comprises a control system according to claim 16.
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    同族专利:
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    US20190010939A1|2019-01-10|
    WO2017125334A1|2017-07-27|
    EP3405673B1|2019-08-28|
    CN108700051B|2019-12-31|
    EP3405673A1|2018-11-28|
    AT518199B1|2017-11-15|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA8014/2016A|AT518199B1|2016-01-18|2016-01-18|Method for detecting a blocked valve of a refrigerant compressor and a control system for a refrigerant compressor|
    AT500082016|2016-01-18|ATA8014/2016A| AT518199B1|2016-01-18|2016-01-18|Method for detecting a blocked valve of a refrigerant compressor and a control system for a refrigerant compressor|
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