Diaphragm compressor oil way system

Abstract

According to the oil way system of the diaphragm compressor, a crankcase is connected with diaphragm heads through middle bodies, diaphragms are arranged in the diaphragm heads, pistons are arranged in the middle bodies, a crankshaft in the crankcase drives the pistons to do reciprocating motion in the middle bodies through connecting rods, and each diaphragm head and each middle body are divided into an air cavity, a diaphragm head oil cavity and a middle body oil cavity through the diaphragms and the pistons; the middle body oil cavity is communicated with an oil tank of the crankcase, the main oil charging path is connected with the oil tank of the crankcase, the branch oil charging path is connected with the membrane head oil cavity, an oil charging pump is arranged on the main oil charging path and can pump oil in the oil tank into the membrane head oil cavity through the main oil charging path and the branch oil charging path, and the unloading oil path is connected with the membrane head oil cavity and the middle body oil cavity. An automatic unloading valve is arranged on the unloading oil way and can unload oil in the membrane head oil cavity to the middle body oil cavity through the unloading oil way, so that the oil returns to the oil tank through the middle body oil cavity. The oil way system of the diaphragm compressor is more convenient and quicker to control, and the safety of operation in a complex environment is improved.

Description

Technical Field

[0001] This application relates to the technical field of diaphragm compressors, and particularly to an oil circuit system for a diaphragm compressor. Background Art

[0002] A diaphragm compressor is a reciprocating compressor that compresses and transports gases by means of a diaphragm reciprocating in a cylinder. It is a positive displacement compressor. Due to its good sealing performance, wide pressure range, and large compression ratio, it is widely used in petrochemical fields such as hydrogen refueling stations to compress and transport various high-purity gases, precious rare gases, toxic and harmful gases, and corrosive gases.

[0003] Before starting the diaphragm compressor, it is necessary to fill the diaphragm head oil cavity with oil. When shutting down or when the oil pressure in the diaphragm head oil cavity is too high, it is necessary to drain the oil from the diaphragm head oil cavity. Currently, the most commonly used method for filling and draining oil is for manual operation to control the opening and closing of the oil circuit through a hand valve. However, affected by factors such as the compression medium of the diaphragm compressor mostly being toxic and corrosive chemical gases and the environment, in some cases, it is not convenient for personnel to operate closely, making the overall operation of the diaphragm compressor complex, requiring professional operators, and the safety of the operators cannot be reliably guaranteed. Moreover, it is also easy to cause machine failures due to human operation errors. Summary of the Utility Model

[0004] This application provides an oil circuit system for a diaphragm compressor to solve the technical problems of inconvenient operation and inability to guarantee safety of the above-mentioned diaphragm compressor.

[0005] The technical solution adopted in this application is as follows:

[0006] An oil circuit system for a diaphragm compressor includes a crankcase and at least one diaphragm head. The crankcase is connected to the diaphragm head through a middle body. A diaphragm is arranged in the diaphragm head, and a piston is arranged in the middle body. The crankshaft in the crankcase drives the piston to reciprocate in the middle body through a connecting rod. Each diaphragm head and each middle body are separated into an air cavity, a diaphragm head oil cavity, and a middle body oil cavity by the diaphragm and the piston. The middle body oil cavity is communicated with the oil tank of the crankcase. The oil circuit system further includes a filling oil circuit and a unloading oil circuit. The filling oil circuit includes a main filling oil path and a filling oil branch corresponding to each diaphragm head oil cavity. The main filling oil path is connected to the oil tank of the crankcase, and the filling oil branch is connected to the diaphragm head oil cavity. A filling oil pump is arranged on the main filling oil path. The filling oil pump can pump the oil in the oil tank into the diaphragm head oil cavity through the main filling oil path and the filling oil branch. The unloading oil circuit is connected to the diaphragm head oil cavity and the middle body oil cavity. An automatic unloading valve is arranged on the unloading oil circuit. The automatic unloading valve can unload the oil in the diaphragm head oil cavity to the middle body oil cavity through the unloading oil circuit, so that the oil returns to the oil tank through the middle body oil cavity.

[0007] The oil circuit system of the diaphragm compressor provided in this application further includes the following additional technical features:

[0008] The oil circuit system further includes a supplementary oil circuit, which connects the fuel tank and the diaphragm head oil chamber. A gear pump is provided on the supplementary oil circuit, and the gear pump can pump the oil in the fuel tank into the diaphragm head oil chamber through the supplementary oil circuit.

[0009] The outlet end of the supplementary oil circuit is connected to the fluid path of the filling oil circuit to connect to the diaphragm head oil chamber through the filling oil circuit.

[0010] A first one-way valve is provided on the supplementary oil circuit to make the supplementary oil circuit conduct unidirectionally with the filling oil circuit through the first one-way valve.

[0011] The outlet of the gear pump is also connected to the lubricating oil injection port of the crankshaft through a lubricating oil circuit.

[0012] The gear pump is arranged in the crankcase and is in transmission connection with the crankshaft in the crankcase to perform the oil pumping work driven by the crankshaft; alternatively, the gear pump is arranged outside the crankcase, and the oil circuit system of the diaphragm compressor further includes a driving motor for driving the gear pump to perform the oil pumping work.

[0013] A filter for filtering the oil is provided on the fluid path from the fuel tank to the gear pump.

[0014] A second one-way valve is provided on the filling oil branch to make the filling oil circuit conduct unidirectionally with the diaphragm head oil chamber through the second one-way valve.

[0015] The filling oil pump is a pneumatic diaphragm pump, which is connected to an external air source to be powered by the external air source. A control valve is provided on the fluid path from the external air source to the pneumatic diaphragm pump.

[0016] The control valve and / or the automatic unloading valve is a pneumatic ball valve.

[0017] Due to the adoption of the above technical solutions, the technical effects achieved by this application at least include:

[0018] 1. The oil circuit system of the diaphragm compressor provided in this application can pump the oil in the fuel tank into the diaphragm head oil chamber quantitatively through program control of the filling oil pump to prepare for the startup of the diaphragm compressor; in the case of shutdown or excessive oil pressure, the automatic unloading valve can be controlled by program to unload the oil in the diaphragm head oil chamber into the intermediate body, so that the oil returns to the fuel tank through the intermediate body to achieve the purpose of unloading. Therefore, the diaphragm compressor controls the start and stop of the oil circuit system through programs, reducing the complexity of operation, making the operation more simple and fast, and at the same time improving the safety of operators in complex and dangerous environments.

[0019] 2. The oil circuit system of the diaphragm compressor of the present application is also integrated with automatic oil replenishment and lubrication functions. When the diaphragm compressor is working, the gear pump can pump the oil in the oil tank into the diaphragm head oil cavity through the oil replenishment circuit to achieve automatic oil replenishment. At the same time, the gear pump can pump the oil in the oil tank into the lubricating oil injection port of the crankshaft through the lubricating oil circuit, so that the lubricating oil enters the preset positions, such as the connection position between the connecting rod and the crankshaft, the connection position between the connecting rod and the piston, etc., to achieve the lubrication of the moving mechanism and improve the service life.

[0020] 3. The oil filling pump is selected as a pneumatic diaphragm pump. The pneumatic diaphragm pump has good self-priming performance and can start without liquid and does not require additional liquid supply. The delivery flow of the pneumatic diaphragm pump can be adjusted according to needs and can meet the requirements of different occasions. The pneumatic diaphragm pump has good corrosion resistance and can transport various corrosive media, with a wide range of applications.

[0021] 4. The automatic unloading valve and the control valve are selected as pneumatic ball valves. The pneumatic ball valve has a relatively fast execution speed. The pneumatic ball valve can achieve local control and remote centralized control. The opening and closing of the valve can be controlled in the control room without having to go to the site or high-altitude and dangerous areas for manual control, saving a great deal of human resources and time and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0023] Figure 1 is a schematic diagram of the oil circuit system of the diaphragm compressor provided by the embodiment of the present application.

[0024] List of components and reference numerals:

[0025] 11 Crankcase, 12 Diaphragm head, 13 Intermediate body, 14 Diaphragm, 15 Air cavity, 16 Diaphragm head oil cavity, 17 Crankshaft, 18 Connecting rod, 19 Piston, 20 Oil filling circuit, 201 Main oil filling path, 202 Oil filling branch, 21 Unloading oil circuit, 22 Oil filling pump, 23 Automatic unloading valve, 24 Control valve, 25 Oil replenishment circuit, 26 Gear pump, 27 First check valve, 28 Lubricating oil circuit, 29 Filter, 30 Second check valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail by way of examples in conjunction with the drawings of the specification.

[0027] In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, the present application may be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0028] In the present application, unless otherwise clearly defined and limited, terms such as "install", "connect", "link", "fix", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0030] In an embodiment of the present application, a diaphragm compressor oil circuit system is provided. For the convenience of description and understanding, the following content provided by the present application is all elaborated on the basis of the illustrated product structure. Of course, those skilled in the art can understand that the above structure is only a specific example and schematic description, and does not constitute a specific limitation on the technical solution provided by the present application.

[0031] Such as Figure 1As shown in the figure, an oil circuit system for a diaphragm compressor provided by the present application includes a crankcase 11 and at least one diaphragm head 12. The crankcase 11 is connected to the diaphragm head 12 through a middle body 13. A diaphragm 14 is provided inside the diaphragm head 12, and a piston 19 is provided inside the middle body 13. A crankshaft 17 inside the crankcase 11 drives the piston 19 to reciprocate inside the middle body 13 through a connecting rod 18. Each diaphragm head 12 and each middle body 13 are separated into an air chamber 15, a diaphragm head oil chamber 16, and a middle body oil chamber by the diaphragm 14 and the piston 19. The middle body oil chamber is communicated with the fuel tank of the crankcase 11. The oil circuit system further includes a filling oil circuit 20 and a unloading oil circuit 21. The filling oil circuit 20 includes a main filling oil path 201 and a filling oil branch 202 corresponding to each diaphragm head oil chamber 16. The main filling oil path 201 is connected to the fuel tank of the crankcase 11, and the filling oil branch 202 is connected to the diaphragm head oil chamber 16. A filling oil pump 22 is provided on the main filling oil path 201. The filling oil pump 22 can pump the oil in the fuel tank into the diaphragm head oil chamber 16 through the main filling oil path 201 and the filling oil branch 202. The unloading oil circuit 21 is connected to the diaphragm head oil chamber 16 and the middle body oil chamber. An automatic unloading valve 23 is provided on the unloading oil circuit 21. The automatic unloading valve 23 can unload the oil in the diaphragm head oil chamber 16 to the middle body oil chamber, so that the oil can return to the fuel tank through the middle body oil chamber.

[0032] Specifically, the diaphragm compressor can be provided with an electric motor or a fuel engine as a power source. The power source drives the piston 19 to reciprocate inside the middle body 13 through the transmission of the crankshaft 17 and the connecting rod 18. During the reciprocating movement of the piston 19, the diaphragm 14 is acted on by the oil in the diaphragm head oil chamber 16, so that the diaphragm 14 reciprocates to change the volume of the air chamber 15, thereby realizing the compression process of the gas in the air chamber 15. In the present application, the number of diaphragm heads 12 included in the oil circuit system of the diaphragm compressor is not limited. Figure 1 An embodiment in which the oil circuit system of the diaphragm compressor includes two diaphragm heads 12 is schematically shown in the figure. Of course, the number of diaphragm heads 12 can also be 1, 3, etc. For Figure 1 the embodiment in which the oil circuit system includes two diaphragm heads 12, the filling oil circuit 20 can be divided into two filling oil branches 202, so that the filling oil pump 22 pumps oil into the two diaphragm head oil chambers 16 synchronously through the two filling oil branches 202. Correspondingly, each of the two diaphragm heads 12 is also provided with an unloading oil circuit 21 and an automatic unloading valve 23.

[0033] The oil circuit system of the present application can pump the oil in the fuel tank into the diaphragm head oil cavity 16 in a quantitative manner through program control of the oil filling pump 22 to prepare for starting the diaphragm compressor. Specifically, the oil filling time of the oil filling pump 22 pumping oil into the diaphragm head oil cavity 16 can be preset through the program. When the oil in the diaphragm head oil cavity 16 reaches the preset amount, the oil filling pump 22 is controlled to stop. In the case of the diaphragm compressor stopping or the oil pressure in the diaphragm head oil cavity 16 being too high, the automatic unloading valve 23 can be controlled through the program to unload the oil in the diaphragm head oil cavity 16 into the intermediate body oil cavity, so that the oil returns to the fuel tank through the intermediate body oil cavity to achieve the purpose of unloading. Therefore, the diaphragm compressor controls the start and stop of the oil circuit system through the program, reducing the complexity of the operation, making the operation more simple and fast, and at the same time improving the safety of the operators in complex and dangerous environments.

[0034] Regarding the specific structure of the oil filling pump 22, in a preferred embodiment, the oil filling pump 22 is set as a pneumatic diaphragm pump, and the pneumatic diaphragm pump is connected to an external air source to be powered by the external air source. A control valve 24 is provided on the fluid path from the external air source to the pneumatic diaphragm pump. The pneumatic diaphragm pump uses compressed air as the power source and is a positive displacement pump with volume changes caused by the reciprocating deformation of the diaphragm. Specifically, an air compressor can be selected as the external air source. The characteristics of the pneumatic diaphragm pump are mainly reflected in the following aspects: First, it has good self-priming performance and can start without liquid and does not require additional liquid supply; second, the delivery flow rate of the pneumatic diaphragm pump can be adjusted according to needs to meet the requirements of different occasions; in addition, the pneumatic diaphragm pump has good corrosion resistance and can transport various corrosive media, with a wide range of applications. The control valve 24 is used to conduct or cut off the fluid path between the external air source and the pneumatic diaphragm pump, and air valves, solenoid valves, etc. can be selected.

[0035] In a preferred embodiment, the control valve 24 is set as a pneumatic ball valve. The pneumatic ball valve has a relatively fast execution speed. The pneumatic ball valve can achieve local control and remote centralized control. The opening and closing of the valve can be controlled in the control room without having to go to the site or high-altitude and dangerous areas for manual control, saving a great deal of human resources and time and improving safety. In other embodiments, the oil filling pump 22 can also be selected as a plunger pump or other suitable structures.

[0036] In another preferred embodiment, the automatic unloading valve 23 can also be set as a pneumatic ball valve. In the case of encountering shutdown, etc., the program controls the pneumatic ball valve to open automatically, unload the oil in the diaphragm head oil cavity 16 into the intermediate body 13, and the oil finally returns to the fuel tank of the crankcase 11 to achieve the purpose of unloading.

[0037] As a preferred implementation manner of the present application, such as Figure 1As shown, the oil circuit system further includes a makeup oil circuit 25, which connects the fuel tank and the diaphragm head oil chamber 16. A gear pump 26 is provided on the makeup oil circuit 25, and the gear pump 26 can pump the oil in the fuel tank into the diaphragm head oil chamber 16 through the makeup oil circuit 25. Specifically, the makeup oil circuit 25 can be used as a path for the fuel tank to supplement oil into the diaphragm head oil chamber 16 during the operation of the diaphragm compressor. The gear pump 26 pumps the oil in the fuel tank into the diaphragm head oil chamber 16 through the makeup oil circuit 25 to achieve automatic oil replenishment, ensure the stable pressure in the diaphragm head oil chamber 16, and ensure that the gas is compressed stably.

[0038] As a preferred embodiment under this implementation manner, the oil outlet end of the makeup oil circuit 25 is connected to the fluid path of the filling oil circuit 20 to connect to the diaphragm head oil chamber 16 through the filling oil circuit 20. Those skilled in the art can understand that, compared with the filling oil circuit 20 and the makeup oil circuit 25 being independent oil circuits, in this embodiment, connecting the oil outlet end of the makeup oil circuit 25 to the fluid path of the filling oil circuit 20 enables the gear pump 26 to pump oil into the diaphragm head oil chamber 16 through the makeup oil circuit 25 and the filling oil circuit 20 in sequence. This method helps to simplify the oil circuits in the oil circuit system, further improve the integration degree of the oil circuit system, and save space. During specific implementation, the oil outlet end of the makeup oil circuit 25 can be connected to the fluid path of the main filling oil path 201, and the oil outlet end of the makeup oil circuit 25 can also be connected to the fluid path of the filling oil branch 202. It only needs to connect the oil outlet end of the makeup oil circuit 25 to the fluid path between the filling oil pump 22 and the diaphragm head oil chamber 16.

[0039] Furthermore, a first one-way valve 27 is provided on the makeup oil circuit 25 to make the makeup oil circuit 25 conduct unidirectionally with the filling oil circuit 20 through the first one-way valve 27. By setting the first one-way valve 27, it avoids the oil from flowing back through the makeup oil circuit 25 when the filling oil pump 22 pumps oil into the diaphragm head oil chamber 16, ensures the reliable operation of the process of the filling oil pump 22 pumping oil into the diaphragm head oil chamber 16, and precisely controls the filling oil volume before starting the machine.

[0040] As a preferred embodiment under this implementation manner, the oil outlet of the gear pump 26 is also connected to the lubricating oil injection port of the crankshaft 17 through a lubricating oil circuit 28. Those skilled in the art can understand that during the operation of the diaphragm compressor, in addition to automatically pumping oil into the diaphragm head oil chamber 16 through the gear pump 26, the oil in the fuel tank can also be pumped into the lubricating oil injection port of the crankshaft 17 through the lubricating oil circuit 28, so that the lubricating oil enters the preset positions, such as the connection position between the connecting rod 18 and the crankshaft 17, the connection position between the connecting rod 18 and the piston 19, etc., to achieve the lubrication of the moving mechanism and improve the service life.

[0041] Regarding the driving method of the gear pump, as a preferred embodiment, as Figure 1As shown, the gear pump 26 is disposed within the crankcase 11 and is in driving connection with the crankshaft 17 within the crankcase 11 to perform oil pumping work driven by the crankshaft 17. In this embodiment, during the operation of the diaphragm compressor, when the power source drives the crankshaft 17 to rotate, while the crankshaft 17 drives the connecting rod 18 to move, it also drives the gear pump 26 to operate automatically, causing the gear pump 26 to automatically pump oil towards the diaphragm head oil cavity 16 and the lubricating oil injection port. Regarding the transmission mode between the crankshaft 17 and the gear pump 26, it can be transmitted through a gear mechanism or a gear-rack mechanism. As an alternative embodiment, the gear pump can also be disposed outside the crankcase, and the diaphragm compressor oil circuit system further includes a driving motor for driving the gear pump to perform oil pumping work, so as to drive the gear pump to perform oil pumping work through the driving motor during the operation of the diaphragm compressor, without relying on the movement of the crankshaft.

[0042] As a preferred embodiment under this embodiment mode, a filter 29 for filtering the oil is provided on the fluid path from the fuel tank to the gear pump 26. Through the filter 29, impurities in the oil in the fuel tank can be filtered out, which helps to protect the structure of the gear pump 26 and can also ensure the purity of the oil pumped by the gear pump 26 to the diaphragm head oil cavity 16 and the crankshaft 17, improving the working stability.

[0043] In a preferred embodiment, as Figure 1 shown, a second one-way valve 30 is provided on the oil filling branch 202, enabling the oil filling path 20 to be in one-way conduction with the diaphragm head oil cavity 16 through the second one-way valve 30. By setting the second one-way valve 30, the oil in the diaphragm head oil cavity 16 can be prevented from leaking and flowing back, ensuring stable operation. In the embodiment where the oil outlet end of the aforementioned oil replenishing path 25 is connected to the fluid path of the oil filling path 20, specifically, the oil outlet end of the oil replenishing path 25 can be connected to the fluid path between the oil filling pump 22 and the second one-way valve 30.

[0044] What is not described in this application can be achieved by adopting or referring to existing technologies.

[0045] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0046] The above are only the embodiments of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. A diaphragm compressor oil circuit system, comprising a crankcase and at least one diaphragm head, the crankcase is connected to the diaphragm head through a middle body, a diaphragm is arranged in the diaphragm head, a piston is arranged in the middle body, the crankshaft in the crankcase drives the piston to reciprocate in the middle body through a connecting rod, each of the diaphragm head and each of the middle body is divided into an air cavity, a diaphragm head oil cavity and a middle body oil cavity by the diaphragm and the piston, the middle body oil cavity is connected to the oil tank of the crankcase, characterized in that The oil circuit system also includes an oil filling circuit and an oil unloading circuit, the oil filling circuit including an oil filling main circuit and an oil filling branch circuit corresponding to each of the diaphragm head oil chambers, the oil filling main circuit is connected to the oil tank of the crankcase, the oil filling branch circuit is connected to the diaphragm head oil chamber, an oil filling pump is provided on the oil filling main circuit, the oil filling pump can pump the oil in the oil tank into the diaphragm head oil chamber through the oil filling main circuit and the oil filling branch circuit, the unloading oil circuit connects the diaphragm head oil chamber and the middle body oil chamber, an automatic unloading valve is provided on the unloading oil circuit, the automatic unloading valve can unload the oil in the diaphragm head oil chamber to the middle body oil chamber through the unloading oil circuit, so that the oil returns to the oil tank through the middle body oil chamber.

2. The diaphragm compressor oil circuit system according to claim 1, characterized in that: It also includes an oil supply circuit, which connects the oil tank and the membrane head oil chamber. A gear pump is provided on the oil supply circuit, and the gear pump can pump the oil in the oil tank into the membrane head oil chamber through the oil supply circuit.

3. The diaphragm compressor oil circuit system according to claim 2, characterized in that: The oil outlet end of the oil replenishment circuit is connected to the fluid path of the oil filling circuit to be connected to the membrane head oil chamber through the oil filling circuit.

4. The diaphragm compressor oil circuit system according to claim 3, characterized in that: The oil replenishment circuit is provided with a first one-way valve, so that the oil replenishment circuit is in one-way communication with the oil filling circuit through the first one-way valve.

5. The diaphragm compressor oil circuit system according to claim 2, characterized in that: The oil outlet of the gear pump is also connected to the lubricating oil injection port of the crankshaft through a lubricating oil passage.

6. The diaphragm compressor oil circuit system according to claim 2, characterized in that: The gear pump is arranged in the crankcase and is drivingly connected to the crankshaft in the crankcase so as to perform oil pumping work under the drive of the crankshaft; Alternatively, the gear pump is arranged on the outside of the crankcase, and the diaphragm compressor oil circuit system also includes a drive motor for driving the gear pump to perform oil pumping work.

7. The diaphragm compressor oil circuit system according to any one of claims 2 to 6, characterized in that: A filter for filtering oil is provided on the fluid path from the oil tank to the gear pump.

8. The diaphragm compressor oil circuit system according to any one of claims 1 to 6, characterized in that: A second one-way valve is disposed on the oil filling branch, so that the oil filling path is in one-way communication with the diaphragm head oil chamber through the second one-way valve.

9. The diaphragm compressor oil circuit system according to any one of claims 1 to 6, characterized in that: The oil charging pump is configured as a pneumatic diaphragm pump, which is connected to an external air source to be powered by the external air source, and a control valve is provided on the fluid path from the external air source to the pneumatic diaphragm pump.

10. The diaphragm compressor oil circuit system according to claim 9, characterized in that: The control valve and / or the automatic unloading valve is a pneumatic ball valve.

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