• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 法律状态
  • 优先权
    • 专利摘要:
    Minimum pressure valve with a valve body (5) that is movable and in a closed position closes the inlet (3) by means of a spring (8) that can exert a force on the valve body (5), this force determining the set point for opening of the minimum pressure valve (1) and wherein the minimum pressure valve (1) is provided with automatic adjustment means for varying the set point of the minimum pressure valve (1) based on the operating conditions of a system connected to the aforementioned inlet (3) of the said minimum pressure valve (1) and / or based on the operating conditions of a system connected to the outlet (4) and / or based on one or more environmental parameters.
    公开号:BE1022252B1
    申请号:E2014/0353
    申请日:2014-05-12
    公开日:2016-03-04
    发明作者:
    申请人:Atlas Copco Airpower, Naamloze Vennootschap；
    IPC主号:
    专利说明:

    Minimum pressure valve.
    The current patent application relates to a minimum pressure valve.
    In compressor installations, a minimum pressure valve is fitted at the outlet of a pressure vessel that serves as a liquid separator.
    By injecting a coolant during the compression of gas into a compressor element that is part of a compressor installation, the temperature rise of the compressed gas can be kept within certain limits. A possibility to circulate the coolant in the compressor installation is by making use of the pressure difference that prevails over the cooling system of the compressor installation.
    In practice, this means that the coolant is forced through the compressor element of the compressor installation and enters the pressure vessel together with the compressed gas. The coolant and gas are separated from each other there.
    The coolant is collected at the bottom of the pressure vessel and is usually, from this point, passed successively through a thermostatic valve, a coolant cooler and a coolant filter to be finally injected back into the compressor element.
    During its passage through the cooling system, the pressure of the coolant will drop. To ensure that the pressure of the refrigerant at the injection point in the compressor element is sufficiently high, the pressure in the pressure vessel must be kept at a sufficiently high level. This is achieved by means of a minimum pressure valve.
    This minimum pressure valve ensures that the pressure in the pressure vessel never falls below a certain minimum value during the loaded situation of the compressor installation. This minimum is the set point or set point of the minimum pressure valve.
    Normally, these minimum pressure valves have one fixed set point that limits the pressure range within which a compressor installation can operate. To determine the lower limit of the operating pressure range, the set point of the minimum pressure valve, one must take into account a number of preconditions and phenomena that may occur as described below.
    The set point of a minimum pressure valve is set so that coolant injection is guaranteed under every condition. This means that even during transition phenomena, the pressure at the injection point is always high enough to avoid temperature peaks. One critical transition occurs when the compressor installation goes from a loaded operating state where no gas is taken to a very low resistance condition. For example, during the emptying of a borehole or in the initial phase of filling a large volume. When this happens, the pressure in the pressure vessel drops very quickly and at the same time the thermal load increases considerably because gas is suddenly compressed again.
    These two things ensure that the temperature in the compressor element rises quickly. If the set point of the minimum pressure valve is higher, the pressure at the injection point will be higher. This will ensure that the temperature peak is lower.
    Gas and coolant are intensively mixed during the operation of a compressor installation. After separation of gas and coolant in the pressure vessel, small gas bubbles still remain in the coolant. As a result, when the pressure in the compressor installation drops rapidly, these gas bubbles will expand, allowing the coolant to foam in the pressure vessel.
    Excessive foaming may result in the foam reaching, for example, the coolant separator element mounted within the pressure vessel, which may adversely affect the separation efficiency or lead to a coolant transfer to users' applications. By choosing the set point of the minimum pressure valve sufficiently high, the risk of this transfer due to this phenomenon can be avoided.
    In very cold conditions, the temperature of the coolant can become very low in the coolant cooler. Due to the combined effect of the increased viscosity of the coolant (which may be, for example, oil) in the coolant cooler, the bypass of coolant over the thermostatic valve and a lower injection pressure of the coolant on the temperature in the compressor element, it is necessary in some cases to increase the coolant injection pressure. With the minimum pressure valve it is possible to keep the injection pressure of the coolant high enough.
    Normally these minimum pressure valves have one fixed set point that must be able to handle the most critical situation. This limits the pressure range within which a compressor installation can work. With a variable minimum pressure valve, a lower set point can be selected and this is increased if one or more of the previously discussed negative situations occur.
    Chinese patent application No. 101,520,103 describes a minimum pressure valve with a set point that can be manually adjusted by increasing or decreasing the back pressure on the back of the minimum pressure valve. In this way the spring force is assisted to keep the valve closed. A disadvantage of such type of minimum pressure valves is that such manual adjustment is slow and is not sufficient to avoid the above-mentioned problems during the transition conditions of the compressor installation.
    The present invention has for its object to provide a solution to at least one or more of the aforementioned and / or other disadvantages.
    To this end the present invention relates to a minimum pressure valve with a housing with an inlet and an outlet which are connected to each other by means of a chamber and with a valve body that is movable in this chamber and in a closed position closes off said inlet by means of a spring which with a first end can exert a force on the valve body, this force determining the set point for opening the minimum pressure valve when the pressure at the inlet is greater than the aforementioned set point and wherein the minimum pressure valve is provided with automatic setting means for varying from the set point of said minimum pressure valve based on the operating conditions of a system connected to the said inlet of said minimum pressure valve and / or based on the operating conditions of a system connected to the outlet and / or based on one or more environmental parameters.
    For example, in a compressor installation, a variable minimum pressure valve will change its set point depending on the pressure and temperature.
    The set point of the minimum pressure valve will be low when an operating condition occurs for a sufficiently long time at low pressure and the ambient temperature is sufficiently high while the set point will be high under operating conditions at high pressure or when the ambient temperature falls below a certain value.
    This has a number of advantages. After all, by making the set point variable, the pressure range within which the compressor installation can operate will become wider because the minimum operating pressure can be reduced while: - the temperature peak remains under control during certain transitions; - foaming of the coolant in the pressure vessel can be avoided; - the air speeds through the filter element do not become too high.
    The advantage of a wider operating range is that: - the fuel efficiency is increased when the installation is running at low pressures; - a lower minimum pressure is favorable for carrying out rock or ground drilling for: - running in a new rotary hammer; - at the start of a bore, a lower pressure is less harmful to the wall of the borehole.
    The invention also relates to a compressor installation comprising a compressor element connected to a pressure vessel, which pressure vessel is connected to an inlet of a minimum pressure valve with a housing with an inlet and an outlet which are connected to each other by means of a chamber and to a valve body that is movable in this chamber and in a closed position, the said inlet is closed by means of a spring which can exert a force on the valve body with a first end, this force determining a set point for opening the minimum pressure valve when the pressure at the inlet is greater is then the aforementioned set point and wherein the minimum pressure valve is further provided with automatic setting means for varying the set point of the said minimum pressure valve on the basis of the operating conditions of the compressor installation connected to the aforementioned inlet and / or of the applications connected to the aforementioned outlet which powered by the com pressor installation and / or based on one or more environmental parameters.
    The invention furthermore relates to a method for setting the set point of a minimum pressure valve of an installation, wherein this method comprises the following steps: - determining the necessary pressure in the installation connected to the inlet of the minimum pressure valve and / or the installation at the outlet and / or determining a different operating condition of the installation and / or determining one or more environmental parameters; on the basis of the determined pressure and / or the operating condition and / or the determined environmental parameter, adjusting the set point of the aforementioned minimum pressure valve.
    With the insight to better demonstrate the features of the invention, a few embodiments of a minimum pressure valve according to the invention are described below, as an example without any limiting character, with reference to the accompanying drawings, in which: figure 1 shows diagrammatically and in perspective a minimum pressure valve according to the invention; figure 2 schematically represents a section according to line II-II in figure 1; figure 3 schematically represents a variant of figure 2; figure 4 schematically represents another variant of the part indicated by F4 in figure 2; figure 5 schematically represents yet another variant of figure 2; figure 6 schematically represents yet another variant of figure 2.
    The minimum pressure valve 1 according to the invention schematically shown in figures 1 and 2 comprises a housing with an inlet 3 and an outlet 4 which are connected to each other by means of a chamber.
    In the figures, the inlet 3 is positioned on the underside of the minimum pressure valve 1, while the outlet 4 is positioned on the side at the bottom.
    In the aforementioned chamber, a movable valve body 5 is provided with a sealing element 6a, 6b.
    In a first closed position, this sealing element 6a, 6b is pressed against a seat 7, which seat 7 is located around the above-mentioned inlet 3, by means of a spring 8 which exerts a force on the valve body 5 with a first end 9. On this valve body in this way the valve body 5 closes the inlet 3 with the sealing element 6a, 6b.
    In this case, but not necessarily, this sealing element 6a, 6b comprises a first part 6a and a second part 6b which are arranged together and fixed to a valve stem 10 with the aid of fastening means 11 such as for example a bolt, screw, glue or any other suitable fasteners.
    It is clear that the sealing element 6a, 6b can also be made as a whole or from more than two parts that are joined together. Moreover, it is also possible that the sealing element 6a, 6b and the valve stem 10 form one whole.
    The valve stem 10 of the valve body 5 is arranged axially slidably in a portion, which portion is hereinafter referred to as the non-return valve housing 12.
    In this case, the non-return valve housing 12 is provided with a circumferentially extending collar 13 lying on the outside and forming a stop for the lower wall 14 of a spring guide 15.
    The spring guide 15 comprises, in addition to the aforementioned lower wall 14, a side wall 16 extending in the circumferential direction and upward in which the aforementioned spring 8 extends at least partially.
    The minimum pressure valve 1 is further provided with a spring housing 17 with a piston housing 18 mounted therein. The spring housing 17 is a part of the housing 2.
    The piston housing 18 is provided with a cavity 19 in which a piston 20 is located which can move in the aforementioned cavity 19.
    The piston 20 is provided with an end surface 21 which rests on the second, upper end 22 of the spring 8 and can exert a force on it, while the aforementioned first end 9 of the spring 8 rests on the lower wall 14 of the spring guide 15 and can thus exert a force on the valve body 5.
    The space 23 defined by the spring housing 17, the piston 20 and the spring guide 15, in other words the space 23 in which the spring 8 is mounted, is in this case connected via a small pipe 24 or tube through the wall of the spring housing 17 with the surrounding environment of the minimum pressure valve 1, so that the aforementioned space 23 is in other words typically at atmospheric pressure.
    The piston 20 comprises a disc-shaped portion 25, preferably with a groove extending in the circumferential direction in which sealing means are provided, such as for example an O-ring 26 which touches the inside of the side wall of the piston housing 18.
    The aforementioned piston housing 18 is preferably provided with stop means 27 which prevent the piston 20 from coming out of the cavity 19 in the piston housing 18. These stop means 27 are, for example, but not necessarily, a circlips or any other suitable stop means provided in the piston housing 18.
    The piston housing 18 can slide in the longitudinal direction XX 'in the spring housing 17. In the aforementioned spring housing 17 a disc 28 is provided which forms an upper stop for the piston housing 18. The aforementioned disc 28 can be moved in the longitudinal direction XX' in the spring housing 17. In this case this can be done manually. In this way, the spring tension can be increased or decreased by moving the disc 28 up or down by allowing the disc 28 to exert a force on the aforementioned second end 22 of the spring 8.
    Figure 2 also shows a screw 29 extending through the side wall of the spring housing 17 and into a groove 30 extending in the longitudinal direction XX 'which is provided in the outer wall of the piston housing 18 so as to prevent the piston housing 18 can rotate in the spring housing 17.
    In this way an opening 31 can be provided through the side wall of the spring housing 17 which aligns in the figures with an opening 32 through the side wall of the piston housing 18 and which is connected to a control valve which is not shown in the figures.
    The aforementioned opening 32 through the side wall of the piston housing 18 opens into a space 33 which is enclosed by the piston housing 18 and the piston 20. In other words, this space 33 is located above the piston 20.
    The operation of the minimum pressure valve shown in Figures 1 and 2 is as follows.
    According to the invention, the inlet 3 of the minimum pressure valve is connected to the pressure vessel of the compressor installation. The spring 8 exerts a force on the sealing element 6a, 6b, via the spring guide 19, the non-return valve housing 12 and the valve stem 10, so that a certain pressure in the pressure vessel is required to lift the sealing element 6a, 6b from the seat 7.
    By displacing the aforementioned disc 28, the spring tension and thus the set point of the minimum pressure valve 1 can be adjusted. In other words, this disc 28 constitutes adjustable means for manually setting the low set point of the minimum pressure valve 1.
    When the space 33 above the piston 20 is placed under pressure on the upper, second end 22 of the spring 8, the piston 20 will move downwards over a certain distance. This distance is such that it corresponds to a certain desired increase in the set point. When the piston 20 is placed under pressure, a greater pressure is needed in the pressure vessel to lift the sealing element 6a, 6b from the seat 7. When the piston 20 makes the maximum displacement, up to the stop means 27, it becomes high set point reached.
    In other words, the piston housing 18 with the piston 20 which can exert a force on the other, upper, second end 22 of the spring 8, the aforementioned space 33 being pressurized via the opening 32 in the piston housing 18 adjusting means for automatically adjusting the set point of the minimum pressure valve 1 between a low and a high set point, said automatic adjusting means being able to change the force exerted by the first end 9 of the spring 8 on the valve body 5, in this case by adjusting the spring tension change by compressing the spring 8.
    The way in which the set point of the minimum pressure valve 1 is controlled by whether or not to allow pressure in the space 33 above the piston 22 can be realized in various ways.
    For example a 3/2 way valve can be used that can be controlled with a control module that, for example, monitors the pressure in the pressure vessel and / or the ambient temperature.
    The control module will, for example, according to a method according to the invention, set the set point of the minimum pressure valve 1 by determining the desired pressure in the pressure vessel and / or the ambient temperature and adjust the aforementioned set point on the basis of this value (s).
    It is also possible that the control module will set the set point based on the current pressure and / or past pressure for the inlet 3 of the minimum pressure valve 1 connected to the compressor element of the compressor installation and based on the ambient temperature.
    In this way it is possible to go to the high set point of the minimum pressure valve 1 at a time when the pressure in the pressure vessel exceeds a certain value and / or when the ambient temperature falls below a certain value.
    When the pressure in the pressure vessel drops below a certain value for a certain time, the set point can be lowered again.
    Another way to implement the automatic adjusting means is to use a motor which can drive, directly or indirectly, means which can change the bias of the spring 8, for example by turning a disc 28 or a screw piece through which the second end 22 of the spring 8 is moved.
    In the case of the embodiment from Figure 2, it is possible, for example, to remove the piston housing 18 and the piston 20 and to have the disk 28 directly determined by the spring force on the sealing element 6a, 6b and to drive the disk 28 directly or indirectly by a motor which can be controlled by a control element. By rotating the motor in one direction, the spring force on the sealing element 6a, 6b can be increased by rotating the disc 28 further in the spring housing 17, by rotating the motor in the other direction, the spring force and consequently the set point can be adjusted. Reduce.
    Figure 3 shows a variant of Figure 2, as an example of another embodiment of a minimum pressure valve 1 according to the invention. In particular, the automatic adjusting means that change the force that the first end 9 of the spring 8 exerts on the valve body 5 are designed in a slightly different way. It is clear that the automatic adjusting means can be designed in various ways in order to be able to change the aforementioned force and are not limited to the embodiments shown in Figures 2 and 3.
    The minimum pressure valve in Fig. 3 differs mainly from that in Fig. 2 in that the piston housing 18 and the piston 20 at the aforementioned space 33 have a smaller diameter B than the diameter C of the inlet at the valve body 5 when it is in the closed state.
    As a result, the piston 20 will only move downwards when the pressure above the piston 20 is sufficiently higher than the pressure acting on the valve body 5.
    Furthermore, in figure 3 two different diameters can be distinguished on the piston 20, respectively a first diameter A of the disc-shaped portion 25 of the piston 20 and a second, smaller diameter B of a protruding portion 34 which extends on the aforementioned disc-shaped portion . The piston housing 18 has corresponding inner diameters A and B.
    The piston housing 18 is configured such that the spring 8 extends only in the lower portion of the cavity 19, which portion has the first, larger diameter A.
    In this embodiment, the aligned openings 31, 32 in the walls of the spring housing 17 and the piston housing 18 are connected to a volume 35 which in turn is connected to the pressure vessel of the compressor installation via a non-return valve 36. This non-return valve 36 is bridged by by means of a restriction 37. This non-return valve 36 only allows a gas flow in the direction of the pressure vessel to the volume 35, but not in the other direction.
    The restriction 37 can be realized in various ways, such as, for example, by means of a capillary which may or may not have a variable flow opening or by means of another type of flow restriction element such as a foam, a gauze or the like.
    The volume can also be designed in various ways, such as, for example, in the form of a small vessel, a pot, a pipe or the like, the internal volume of which is adjustable or not or in any other suitable form to achieve the desired result. .
    In the embodiment as shown in Figure 3, the set point cannot be freely selected, but it will change in a continuous manner when the pressure in the compressor installation drops very rapidly and a set point drop will be realized in a slow manner.
    In this case too, the low set point is determined by the force or bias of the spring 8 on the valve body 5. The bias of the spring 8 and thus this low set point can be adjusted by means of the disk 28.
    The pressure of the pressure vessel is also admitted to the volume 35 and into the space 33 above the piston 20 on the top of the minimum pressure valve 1.
    Since the diameter B of the projecting portion 34 on the aforementioned disc-shaped portion 25 of the piston 20 is smaller than the diameter of the sealing element 6a, 6b of the valve body, or rather, smaller than the diameter C of the inlet 3 at the location of this sealing element 6a, 6b, the force of the piston 20 will not be sufficient to move downwards against the force of the spring 8. The minimum pressure valve 1 is now set at the low set point.
    However, as soon as the pressure in the pressure vessel drops relatively quickly, the non-return valve 36 between the pressure vessel and the small vessel will prevent the pressure in the small vessel 35 from falling. The force of the piston 20 is now greater than that of the sealing element 6a, 6b and the piston 20 will move downwards and increase the set point of the minimum pressure valve 1.
    The restriction 37 is placed in parallel with the non-return valve 36, for example in the form of a small opening, which will allow a small gas flow from the volume 35 to the pressure vessel. In this way, the pressure on the piston 20 and thus the force exerted by the piston 20 slowly decreases and the set point of the minimum pressure valve 1 will drop to the low set point in a controlled manner.
    The advantage of this is that there is no need for an external check for the set point, so that a fully autonomous system is obtained. However, one can choose to make the restriction and the non-return valve lockable, so that one can choose the set point and also get a gradual transition from the high to the low set point.
    Figure 4 shows an alternative embodiment of the valve body 5 with the sealing element 6a, 6b and the non-return valve housing 12.
    The whole of the valve body 5 with sealing element 6a, 6b and the non-return valve housing 12 has been replaced by a cylindrical valve body 38 which can move in the housing 2 in the longitudinal direction X-X '.
    In this case, but not necessarily for the invention, the spring guide 15 is integrated with this cylindrical valve body 38.
    A stop 39 is provided in the housing 2 of the minimum pressure valve 1 which prevents the cylindrical valve body 38 from leaving the housing 2. The cylindrical valve body 38 will not cause the closure of the minimum pressure valve 1 to be pressed against this stop 39, instead a seal 40 is arranged in the housing 2 in the form of an O-ring 40. This O-ring 40 will ensure the closure of the minimum pressure valve 1.
    The cylindrical valve body 38 is provided with a small groove 41 and one or more openings 42. When the pressure in the pressure vessel will increase, the cylindrical valve body 38 will move upwards against the force of the spring 8. Only when the aforementioned opening 41 reaches the aforementioned O-ring 40 will the minimum pressure valve 1 be opened.
    By appropriately choosing the dimensions and location of the cylindrical valve body 38, the groove 41, the aperture 42 and the O-ring 40, the pressure in the pressure vessel will have to exceed a certain level before the aperture 41 exceeds the aforementioned O-ring 40 achieved.
    It is clear that it is also possible that the O-ring can also be provided on the cylindrical valve body 38 and the opening 41 as a recess in the housing 2 of the minimum pressure valve 1.
    Figure 5 shows another alternative embodiment of Figure 2, in which in this case the means for manually setting the set point of the minimum pressure valve 1 are designed in a different way than with the aid of the disc 28.
    For the rest, this embodiment is analogous to that of Figure 2.
    In this case, the disc 28 is absent and the piston housing 18 is not mounted in the spring housing 17, but is mounted on the spring housing 17 with the aid of a screw connection piece 43. The spring housing 17 is opened for this purpose at the top so that the spring 8 passes through the spring housing 17 can extend up to the piston 20. The spring housing 17 is also provided with a thread 4 which can cooperate with the screw connection piece 43.
    An advantage of this embodiment is that the opening 32 of the space above the piston 20 is rotatable. In other words, the orientation or location of this opening 32 can be changed independently of the outlet 4. As a result, when the valve is mounted on the installation with the axis XX 'in the horizontal plane, the opening 32 is always downwards can be oriented independently of the orientation of the outlet 4 of the minimum pressure valve 1. In this way, condensation formed during the transition from the high to the low set point or during standstill, or oil residues, is automatically discharged. This is made possible by the fact that the cylindrical piston housing 18, which is provided with an additional edge, is retained by an edge on the cylindrical hole in the screw connector 43 through which the piston housing 18 protrudes. A ring is mounted between the two aforementioned edges that minimizes friction between both edges.
    By tightening the screw connection piece 43 more or less on the spring housing 17, the piston housing 18 is brought more or less down towards the spring housing 17. The spring tension can be adjusted in this way.
    The operation is otherwise analogous to that of the minimum pressure valve 1 shown in Figure 2.
    Figure 6 shows another alternative embodiment of a minimum pressure valve 1 according to the invention.
    Where in Figs. 2, 3 and 5 the automatic adjusting means can change the force that the first end 9 of the spring 8 exerts on the valve body 5, in Fig. 6 these automatic adjusting means can change the surface of the valve body 5 on which the pressure can be released from the pressure vessel change the impact.
    For this purpose, a bushing 45 is provided in the inlet 3, which bushing 45 has a small inner diameter D.
    The sealing element 6a, 6b is provided with two diameters, the first part 6a being made stepwise thicker and having a diameter on one side corresponding to the small inner diameter D of the bush 45, while on the other side the diameter corresponds to the larger one diameter C of the seat 7 in the housing 2.
    The sleeve 45 can move in the longitudinal direction X-X 'in the inlet 3, whereby the size of the inlet 3 at the height of the valve body 5 can be changed.
    As a result, the surface of the sealing element 6a, 6b on which the pressure of the pressure vessel will act will become smaller or larger, so that the sealing element 6a, 6b experiences a smaller or greater force. This will ensure that the set point of the minimum pressure valve 1 can be changed.
    It is clear that in this case the automatic adjustment means can only define two different set points, as is also the case for the embodiment in figure 3.
    The sleeve 45 is held in a first position by a compression spring 46 which presses against one side 47 of the sleeve 45. In this first position, as shown in Figure 6, the portion 48 of the small inner diameter D sleeve will seal around the small diameter D stage of the first part 6a of the sealing element 6a, 6b, so that only a small area of the sealing element 6a, 6b can act on the pressure of the gas in the pressure vessel. In other words, a higher pressure is needed in the pressure vessel to be able to open the minimum pressure valve 1.
    In order to be able to move the sleeve 45 automatically, use is made of a pressure connection port 49 which is arranged in the housing 2 and opens onto the other side 50 of the sleeve 45.
    By means of a valve that is not shown in the figure, the pressure connection port 49 is connected to the pressure vessel. As a result, the sleeve 45 can be pushed downwards, against the force of the compression spring 4 6, to a second position. This creates a pressure chamber 51 on the aforementioned other side 50 of the sleeve 45.
    It is important here that the characteristics of the compression spring 4 6 and the working surfaces of the sleeve 4 are selected correctly.
    In the aforementioned second position of the bush 45, a larger inner diameter C of the bush 45 will be located at the location of the seat 7 and the sealing element 6a, 6b. In other words, in this position the pressure of the gas in the pressure vessel can act on the large surface of the sealing element 6a, 6b, so that a lower pressure in the pressure vessel is required to be able to open the minimum pressure valve 1.
    By means of the valve, the pressure connection port 4 can be connected to the atmosphere, as a result of which the pressure in the pressure chamber 51 will drop to atmospheric pressure and the sleeve 45 will be pressed back into the first position by the pressure spring 46.
    In the housing 2, a small channel 52 is provided which connects the aforementioned pressure chamber 51 to the inlet 3 when the sleeve 45 is in the second position.
    When the canister 45 returns to the first position, a space will be formed by the canister 45, the valve body 5 and the housing 2. The air in this space can escape via the small channel 52 to the pressure chamber 51 and via the pressure connection port 49 to the outside environment.
    It is important that this small channel 52 forms a sufficiently large restriction so that the pressure in the pressure chamber 50 becomes sufficiently low during the draining of the aforementioned space.
    A seal 53, such as, for example, an O-ring, is also provided in the sleeve 45 so that no air can escape through the small channel 52 when the sleeve 45 is in the first position.
    Although in all the examples shown above the spring 8 is designed as a physical spring 8, it is possible to design this spring 8 in different ways, for example in the form of a chamber which has been brought to a specific pressure. The pressure in the chamber will then, as it were, form the 'resilience' or in other words exert a force on the valve body 5. By increasing or decreasing the pressure in the chamber, the 'resilience' can be changed.
    The present invention is by no means limited to the embodiments described as examples and shown in the figures, but a minimum pressure valve according to the invention can be realized according to all kinds of variants without departing from the scope of the invention.
    权利要求:
    Claims (18)
    [1]
    Conclusions.
    1. - Minimum pressure valve with a housing (2) with an inlet (3) and an outlet (4) which are connected to each other by means of a chamber and with a valve body (5) movable in this chamber and in a closed position closing said inlet (3) by means of a spring (8) which can exert a force on the valve body (5) with a first end (9), this force determining the set point for opening the minimum pressure valve (1) when the pressure at the inlet (3) is greater than the aforementioned set point and wherein the minimum pressure valve (1) is provided with automatic setting means for varying the set point of the said minimum pressure valve (1) based on the operating conditions of a system connected to the said inlet (3) of said minimum pressure valve (1) and / or based on the operating conditions of a system connected to the outlet (4) and / or based on one or more environmental parameters.
    [2]
    Minimum pressure valve according to claim 1, characterized in that the automatic adjusting means can change the force exerted by the first end (9) of the spring (8) on the valve body (5) by changing the spring tension by the spring (8) compressing more or less.
    [3]
    Minimum pressure valve according to claim 2, characterized in that said automatic adjusting means comprise a piston housing (18) with a piston (20), which piston (20) exerts a force on the other, second end (22) of said spring (8) wherein the space (33) enclosed by the piston housing (18) and the piston (20) can be pressurized via an opening (32) in the piston housing (18) which connects to the aforementioned space (33).
    [4]
    The minimum pressure valve according to claim 3, characterized in that said space (33) can be pressurized by said opening (32) being connected to a control valve for supplying gas to said space (33), wherein a control module control the control valve on the basis of the operating conditions of a system connected to the above-mentioned inlet (3) of the above-mentioned minimum pressure valve (1) and / or on the basis of the operating conditions of a system connected to the outlet (4) and / or on the basis of one or more environmental parameters.
    [5]
    Minimum pressure valve according to claim 3, characterized in that the piston housing (18) and the piston (20) have a smaller diameter (B) at the location of said space (33) than the diameter (C) of the inlet (3) at the location of the valve body (5) when it is in the closed state, wherein said space (33) can be pressurized because said opening (32) is connected to a volume (35) which in turn is connected with a pressure vessel connected to the inlet (3) of the minimum pressure valve (1), the volume (35) being connected to the pressure vessel via a non-return valve (36) that only allows a gas flow in the direction from the pressure vessel to the volume (35), wherein a restriction (37) is placed parallel to the non-return valve (36).
    [6]
    The minimum pressure valve according to claim 5, characterized in that the restriction (37) comprises a capillary which may or may not have a variable flow opening and / or a flow restriction element such as a foam, a gauze or the like.
    [7]
    Minimum pressure valve according to claim 5 or 6, characterized in that the volume (35) comprises a small vessel, a pot, a pipe or the like, the internal volume of which can be adjusted or not.
    [8]
    Minimum pressure valve according to claim 1, characterized in that said automatic adjusting means can change the surface of the valve body (5) on which the pressure from a pressure vessel or the like can act, wherein the pressure vessel is connected to the inlet (3) of the minimum pressure valve (1).
    [9]
    The minimum pressure valve according to claim one of the preceding claims, characterized in that the minimum pressure valve (1) further comprises adjustable means for initially manually setting the low or high set point of the minimum pressure valve (1).
    [10]
    The minimum pressure valve according to claim 9, characterized in that said adjustable means comprise a disc (28) or the like that is manually displaceable relative to the spring (8) and which is on the other, second end (22) of the spring ( 8) can exert a force.
    [11]
    The minimum pressure valve according to claim 9, characterized in that said adjustable means are formed in that the piston housing (18) is fixed to the housing (2) by means of a screw connection piece (42), whereby the screw connection piece is tightened more or less ( 42) the piston housing (18) is moved more or less towards the spring (8), whereby the piston (20) exerts more or less force on the spring.
    [12]
    The minimum pressure valve according to claim 11, characterized in that there are provisions that allow to change the orientation or location of the opening (32) independently of the outlet (4) so that condensate or oil residues in the space (33) can be drained automatically .
    [13]
    The minimum pressure valve according to claim 2, characterized in that the automatic adjusting means comprise a motor which, directly or indirectly, can drive means which can change the bias of the spring (8), albeit by turning a disk or a screw piece displacing the second end (22) of the spring (8).
    [14]
    Minimum pressure valve according to one of the preceding claims, characterized in that the spring (8) is designed in the form of a pressure chamber, wherein the pressure in the chamber can exert a force on the valve body (5).
    [15]
    15. - Compressor installation comprising a compressor element connected to a pressure vessel, which pressure vessel is connected to an inlet (3) of a minimum pressure valve (1) with a housing (2) with an inlet (3) and an outlet (4) which are connected to each other be connected by means of a chamber and with a valve body (5) movable in this chamber and in a closed position closing said inlet (3) by means of a spring (8) which exerts a force with a first end (9) can apply to the valve body (5), this force defining a set point for opening the minimum pressure valve (1) when the pressure at the inlet (3) is greater than the aforementioned set point and wherein the minimum pressure valve (1) is provided with automatic setting means for varying the set point of said minimum pressure valve (1) based on the operating conditions of the compressor installation connected to said inlet (3) and / or of the applications connected to said outlet (4) which are fed by the compressor installation and / or on the basis of one or more environmental parameters.
    [16]
    Compressor installation according to claim 15, characterized in that use is made of a minimum pressure valve (1) according to one of the preceding claims 1 to 13.
    [17]
    17. - Method for setting the set point of a minimum pressure valve (1) of an installation, characterized in that this method comprises the following steps: - determining the necessary pressure in the installation connected to the inlet (3) of the minimum pressure valve (1) and / or the installation at the outlet (4) and / or determining another operating condition of the installation and / or determining one or more environmental parameters; - adjusting the set point of the aforementioned minimum pressure valve (1) based on the determined pressure and / or operating condition and / or the determined environmental parameters.
    [18]
    Method according to claim 17, characterized in that the installation is a compressor installation with at least one compressor element, wherein the set point of the minimum pressure valve (1) is determined on the basis of the current pressure and / or the past pressure for the inlet ( 3) of the minimum pressure valve (1) connected to the compressor element and based on the ambient temperature.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB465880A|1935-11-15|1937-05-18|Vickers Aviat Ltd|Improvements in or relating to valves for high pressure hydraulic transmission|
    EP0101523A1|1982-08-19|1984-02-29|Vickers Systems GmbH|Pressure-limiting apparatus|
    GB2150266A|1983-11-24|1985-06-26|Teves Gmbh Alfred|Pressure valve|
    DE4221213A1|1992-06-27|1994-01-05|Rexroth Mannesmann Gmbh|Pressure limiting valve for hydraulic equipment - has pair of stops to limit movement range of a control piston plunger.|
    EP1146267A1|1998-12-28|2001-10-17|Furukawa Co., Ltd.|Pressure control valve|
    US20110108130A1|2009-11-12|2011-05-12|Schultz Jeffrey A|Pressure regulator valve seals, systems and methods|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US201361823110P| true| 2013-05-14|2013-05-14|
    US61/823110|2013-05-14|PCT/BE2014/000020| WO2014183173A1|2013-05-14|2014-05-13|Minimum pressure valve|
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