Diaphragm head assembly and diaphragm compressor

Abstract

The present invention discloses a diaphragm head assembly and a diaphragm compressor, wherein the diaphragm head assembly includes a cylinder body, an oil cylinder body, a diaphragm, a piston, a compression check valve, an expansion check valve, an oil replenishment assembly and an oil overflow assembly, wherein the oil cylinder body also has a compression channel and an expansion channel connecting the piston cavity and the oil cavity, wherein the compression check valve is arranged in the compression channel, and the expansion check valve is arranged in the expansion channel, and the opening pressure of the expansion check valve is less than the suction pressure of the intake valve. During the expansion process of the diaphragm head assembly of the present invention, the oil pressure in the oil cavity will always be in a positive pressure state, which can effectively prevent the diaphragm from slapping the oil cylinder body due to the reduction of the oil amount in the oil cavity, thereby protecting the diaphragm from damage, which can not only improve the service life of the diaphragm, but also prevent the fragments generated by the diaphragm slapping the cylinder body from contaminating the compressed working fluid, thereby improving the operating reliability of the diaphragm compressor equipment and reducing the maintenance cost of the diaphragm compressor equipment.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm compressors, and in particular to a diaphragm head assembly and a diaphragm compressor. Background Art

[0002] The diaphragm compressor is a basic working unit composed of a group of diaphragms compressed by a cylinder body and an oil cylinder body. The air-side diaphragm cavity is formed between the cylinder body and the diaphragm, and the oil-side diaphragm cavity is formed between the oil cylinder body and the diaphragm. A piston is also arranged in the oil cylinder body. The piston reciprocates in the oil cylinder body and pushes the hydraulic oil in the oil-side diaphragm cavity to move at the same time. The hydraulic oil pushes the diaphragm to deform to complete the compression and exhaust of the gas in the air-side diaphragm cavity.

[0003] In the related art, in order to ensure the normal operation of the diaphragm compressor, an oil replenishment component and an oil overflow component are provided on the oil cylinder body to realize the normal suction and exhaust process of each cycle. However, as the working time of the diaphragm compressor increases, the wear of the oil replenishment and oil overflow components increases, or due to the increased wear of the piston ring, the hydraulic oil discharge of the diaphragm compressor per working cycle will be greater than the oil replenishment amount, causing the diaphragm to hit the oil cylinder body, resulting in a significant reduction in the life of the diaphragm. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, an embodiment of the present invention provides a diaphragm head assembly to increase the service life of a diaphragm, and an embodiment of the present invention also provides a diaphragm compressor to increase the service life of a diaphragm.

[0005] The diaphragm head assembly of the embodiment of the present invention comprises a cylinder body, an oil cylinder body, a diaphragm, a piston, a compression check valve, an expansion check valve, an oil replenishment assembly and an oil overflow assembly, wherein the cylinder body is connected to the oil cylinder body, the diaphragm is arranged between the cylinder body and the oil cylinder body, an air cavity is defined between the cylinder body and the diaphragm, an oil cavity is defined between the oil cylinder body and the diaphragm, an air intake valve and an exhaust valve are arranged on the cylinder body, a piston cavity is provided on the oil cylinder body, the piston is arranged in the piston cavity and can reciprocate in the piston cavity, and the oil cylinder body also has a compression channel and an expansion channel connecting the piston cavity and the oil cavity;

[0006] The compression check valve is arranged in the compression channel with its outlet end facing the oil chamber, the expansion check valve is arranged in the expansion channel with its outlet end facing the piston chamber, and the opening pressure of the expansion check valve is less than the suction pressure of the intake valve; the oil replenishing assembly and the oil overflow assembly are respectively used for replenishing oil and draining oil from the oil chamber.

[0007] In some embodiments, the opening pressure of the compression check valve is less than the exhaust pressure of the exhaust valve.

[0008] In some embodiments, there are multiple compression channels, and each compression channel is provided with the compression one-way valve.

[0009] In some embodiments, there are multiple expansion channels, and each compression channel is provided with the expansion one-way valve.

[0010] In some embodiments, the cylinder block is connected to the oil cylinder block via stud bolts, and the number of the stud bolts is multiple.

[0011] In some embodiments, the cylinder body has an intake passage and an exhaust passage communicating with the air cavity, the intake valve is arranged in the intake passage, and the exhaust valve is arranged in the exhaust passage.

[0012] In some embodiments, the oil replenishment assembly includes an oil replenishment pump, an oil inlet pipeline and an oil replenishment valve, the inlet end of the oil inlet pipeline is connected to the oil replenishment pump, the outlet end of the oil inlet pipeline is connected to the oil chamber, and the oil replenishment valve is arranged on the oil inlet pipeline.

[0013] In some embodiments, the oil overflow assembly includes an oil outlet pipeline and an oil overflow valve, the inlet end of the oil outlet pipeline is connected to the oil cavity, the outlet end of the oil outlet pipeline is arranged outside the oil cavity, and the oil overflow valve is arranged on the oil overflow pipeline.

[0014] In some embodiments, the diaphragm includes an air side diaphragm, an intermediate diaphragm and an oil side diaphragm, the intermediate diaphragm is arranged between the air side diaphragm and the oil side diaphragm, the air side diaphragm is arranged adjacent to the cylinder body, and the oil side diaphragm is arranged adjacent to the oil cylinder body.

[0015] The diaphragm compressor of the embodiment of the present invention includes the diaphragm head assembly described in any one of the above embodiments.

[0016] When the diaphragm head assembly of the embodiment of the present invention is working, when the wear of the oil replenishing assembly and the oil overflow assembly increases with the increase of the working time of the diaphragm compressor, or the wear of the piston ring increases, causing the discharge of hydraulic oil in each working cycle of the diaphragm compressor to be greater than the oil replenishing amount, during the expansion process, the oil pressure in the oil chamber will always be in a positive pressure state, which can effectively prevent the diaphragm from hitting the cylinder body due to the reduction of the oil amount in the oil chamber, thereby protecting the diaphragm from damage. Not only can the service life of the diaphragm be improved, but also the fragments generated by the diaphragm hitting the cylinder body can be prevented from contaminating the compressed working fluid, thereby improving the operating reliability of the diaphragm compressor equipment and reducing the maintenance cost of the diaphragm compressor equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a working state of a membrane head assembly according to an embodiment of the present invention.

[0018] Figure 2It is a schematic diagram of another working state of the membrane head assembly according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] 1. Cylinder body; 101. Intake passage; 102. Exhaust passage; 2. Cylinder body; 201. Piston chamber; 202. Compression passage; 203. Expansion passage; 3. Diaphragm; 4. Piston; 5. Air chamber; 6. Oil chamber; 7. Intake valve; 8. Exhaust valve; 9. Compression check valve; 10. Expansion check valve; 11. Oil replenishment assembly; 1101. Oil inlet pipeline; 1102. Oil replenishment valve; 12. Oil overflow assembly; 1201. Oil outlet pipeline; 1202. Oil overflow valve; 13. Stud bolts. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0022] The diaphragm compressor of the embodiment of the present invention includes a diaphragm head assembly, and the diaphragm head assembly of the present application is described in detail below with reference to the accompanying drawings. Figure 1 and Figure 2 As shown, the diaphragm head assembly of the embodiment of the present invention includes a cylinder body 1, an oil cylinder body 2, a diaphragm 3, a piston 4, a compression check valve 9, an expansion check valve 10, an oil replenishment assembly 11 and an oil overflow assembly 12.

[0023] The cylinder body 1 is connected to the oil cylinder body 2, and the diaphragm 3 is arranged between the cylinder body 1 and the oil cylinder body 2. An air cavity 5 is defined between the cylinder body 1 and the diaphragm 3, and an oil cavity 6 is defined between the oil cylinder body 2 and the diaphragm 3. The cylinder body 1 is provided with an intake valve 7 and an exhaust valve 8, and the oil cylinder body 2 has a piston cavity 201. The piston 4 is arranged in the piston cavity 201 and can reciprocate in the piston cavity 201. The oil cylinder body 2 also has a compression channel 202 and an expansion channel 203 connecting the piston cavity 201 and the oil cavity 6.

[0024] The compression check valve 9 is arranged in the compression channel 202 with its outlet end facing the oil chamber 6. The expansion check valve 10 is arranged in the expansion channel 203 with its outlet end facing the piston chamber 201. The opening pressure of the expansion check valve 10 is less than the suction pressure of the intake valve 7. The oil replenishing assembly 11 and the oil overflow assembly 12 are respectively used for replenishing oil and draining oil from the oil chamber 6.

[0025] It should be noted that, when the piston 4 moves upward, in order to prevent overpressure from being generated in the oil chamber 6 when the piston 4 moves upward, when the oil chamber 6 reaches the preset pressure, the high-pressure oil in the oil chamber 6 needs to be depressurized in time. In addition, when the diaphragm compressor works for a long time, the temperature of the hydraulic oil in the oil chamber 6 will increase and needs to be cooled. Therefore, the high-temperature hydraulic oil in the oil chamber 6 is discharged through the oil overflow component 12, and the hydraulic oil can be cooled at low temperature while depressurizing the oil chamber 6, so that the diaphragm compressor can work normally.

[0026] When the piston 4 moves downward, due to the wear of the oil overflow assembly 12 and the piston ring, the hydraulic oil in the oil chamber 6 will flow out at the worn part, resulting in a reduction in the amount of oil in the oil chamber 6. In order to ensure that the diaphragm 3 does not rattle due to the reduction of the hydraulic oil in the oil chamber 6, the oil replenishing assembly 11 is required to replenish the hydraulic oil in the oil chamber 6 by generally less than 0.5% per cycle so that the diaphragm compressor can work normally.

[0027] like Figure 1 The figure shows the working schematic diagram of the piston 4 when it moves upward. When the piston 4 moves from the lower dead center to the upper dead center, the oil pressure in the piston chamber 201 increases, and the hydraulic oil in the piston chamber 201 enters the oil chamber 6 through the compression check valve 9. The hydraulic oil in the oil chamber 6 pushes the diaphragm 3 to deform upward. At this time, the hydraulic oil in the oil chamber 6 and the gas in the air chamber 5 are compressed together. As the piston 4 moves further upward, the pressure of the compressed gas in the air chamber 5 is greater than the opening pressure of the exhaust valve 8, and the exhaust valve 8 opens to start the exhaust process. When the diaphragm 3 moves to the upper surface of the air chamber 5 close to the cylinder body 1, the gas in the air chamber 5 is completely discharged, and the piston 4 has not reached the upper dead center at this time. As the piston 4 continues to move upward, the oil pressure in the oil chamber 6 is greater than the oil leakage pressure of the oil overflow assembly 12, and the oil overflow assembly 12 opens to discharge the hydraulic oil in the oil chamber 6 to reduce the oil pressure in the oil chamber 6 and avoid overpressure. The gas compression process is completed.

[0028] like Figure 2The schematic diagram of the operation of the piston 4 when it moves downward is shown in FIG. 1 . The diaphragm 3 separates from the upper surface of the air chamber 5 and starts to move downward. The oil overflow assembly 12 is closed. At this time, the oil pressure in the oil chamber 6 is still high. The expansion check valve 10 is opened. The hydraulic oil in the oil chamber 6 enters the piston chamber 201 through the expansion check valve 10. The volume of the hydraulic oil in the oil chamber 6 increases and begins to expand. The oil pressure in the oil chamber 6 begins to decrease. The diaphragm 3 begins to deform downward under the action of the hydraulic oil. As the piston 4 continues to move downward, when the oil pressure in the oil chamber 6 continues to decrease to the suction pressure of the intake valve 7, the intake valve 7 opens and starts to inhale. At the same time, during the suction process, the oil replenishment assembly 11 injects a certain volume of hydraulic oil into the oil chamber 6 for replenishment. When the hydraulic oil pressure in the oil chamber 6 continues to decrease to the opening pressure of the expansion check valve 10, the expansion check valve 10 is closed. When the piston 4 continues to move downward, the oil pressure in the oil chamber 6 remains unchanged, and the oil pressure in the piston chamber 201 continues to decrease, which ensures that the oil pressure in the oil chamber 6 is always in a positive pressure state.

[0029] When the wear of the oil replenishing component 11 and the oil overflow component 12 increases with the increase of the working time of the diaphragm compressor, or the wear of the piston ring increases, resulting in the discharge of hydraulic oil in each working cycle of the diaphragm compressor being greater than the oil replenishing amount, during the expansion process, the oil pressure in the oil chamber 6 will always be in a positive pressure state, which can effectively prevent the diaphragm 3 from hitting the cylinder body 2 due to the reduction of the oil amount in the oil chamber 6, thereby protecting the diaphragm 3 from damage. It can not only improve the service life of the diaphragm 3, but also prevent the diaphragm 3 from contaminating the compressed working fluid due to the fragments generated by hitting the cylinder body, thereby improving the operating reliability of the diaphragm compressor equipment and reducing the maintenance cost of the diaphragm compressor equipment.

[0030] In some embodiments, the opening pressure of the compression check valve 9 is less than the exhaust pressure of the exhaust valve 8. It is understandable that the purpose of setting the compression check valve 9 is to prevent the hydraulic oil in the oil chamber 6 from entering the piston chamber 201 through the compression channel 202 when the piston 4 moves downward, so that the hydraulic oil in the oil chamber 6 can enter the piston chamber 201 only through the expansion channel 203. Therefore, the opening pressure of the compression check valve 9 does not need to be set high, and a smaller opening pressure value can be used. By setting the opening pressure of the compression check valve 9 to be less than the exhaust pressure of the exhaust valve 8, the compression check valve 9 can be opened before the oil pressure in the piston chamber 201 reaches the exhaust pressure of the exhaust valve 8, so that the hydraulic oil in the piston chamber 201 enters the oil chamber 6 to drive the diaphragm 3 to compress the gas in the gas chamber 5 to the exhaust pressure.

[0031] In some embodiments, there are multiple compression channels 202, and each compression channel 202 is provided with a compression check valve 9. For example, the number of compression channels 202 can be two, three, four or even more, and multiple compression channels 202 are evenly spaced on the cylinder body 2. By providing multiple compression channels 202 and providing a compression check valve 9 in each compression channel 202, when a compression check valve 9 fails to open normally under the opening pressure, other normal compression check valves 9 can continue to work, avoiding the safety risk of cylinder explosion, which is conducive to improving the working safety of the diaphragm compressor of the embodiment of the present invention.

[0032] In some embodiments, there are multiple expansion channels 203, and each compression channel 202 is provided with an expansion check valve 10. For example, the number of expansion channels 203 can be two, three, four or even more, and multiple expansion channels 203 are evenly spaced on the oil cylinder body 2. By providing multiple expansion channels 203 and providing an expansion check valve 10 in each expansion channel 203, when a certain expansion check valve 10 fails and cannot be opened normally under the opening pressure, other normal expansion check valves 10 can continue to work, avoiding the safety risk of explosion of the piston 4 cylinder, which is conducive to improving the working safety of the diaphragm compressor of the embodiment of the present invention.

[0033] Alternatively, if Figure 1 and Figure 2 As shown, the cylinder block 1 is connected to the oil cylinder block 2 via stud bolts 13, so that the cylinder block 1 and the oil cylinder block 2 are easily assembled. The number of stud bolts 13 is multiple, and the stud bolts 13 can also be evenly stressed to improve the connection reliability between the cylinder block 1 and the oil cylinder block 2.

[0034] In some embodiments, the cylinder body 1 is provided with an intake passage 101 and an exhaust passage 102 communicating with the air cavity 5, the intake valve 7 is arranged in the intake passage 101, and the exhaust valve 8 is arranged in the exhaust passage 102. By providing the intake passage 101 and the exhaust passage 102 on the cylinder body 1 to install the intake valve 7 and the exhaust valve 8, the intake valve 7 and the exhaust valve 8 can be protected, and the intake valve 7 and the exhaust valve 8 can be prevented from being damaged due to collision with objects during the use of the diaphragm compressor, and the protection safety is high.

[0035] Optionally, the oil replenishment assembly 11 includes an oil replenishment pump (not shown in the figure), an oil inlet pipeline 1101 and an oil replenishment valve 1102, the inlet end of the oil inlet pipeline 1101 is connected to the oil replenishment pump, the outlet end of the oil inlet pipeline 1101 is connected to the oil chamber 6, and the oil replenishment valve 1102 is arranged on the oil inlet pipeline 1101. For example, the oil replenishment pump is an oil replenishment plunger pump. Specifically, when the oil chamber 6 is replenished with oil, the oil replenishment plunger pump is turned on to deliver hydraulic oil with a certain pressure to the oil chamber 6 through the oil replenishment valve 1102 and the oil inlet pipeline 1101.

[0036] Optionally, the oil overflow component 12 includes an oil outlet pipeline 1201 and an oil overflow valve 1202, the inlet end of the oil outlet pipeline 1201 is connected to the oil chamber 6, the outlet end of the oil outlet pipeline 1201 is arranged outside the oil chamber 6, and the oil overflow valve 1202 is arranged on the oil overflow pipeline.

[0037] In some embodiments, the diaphragm 3 includes an air side diaphragm 3, an intermediate diaphragm 3 and an oil side diaphragm 3, the intermediate diaphragm 3 is arranged between the air side diaphragm 3 and the oil side diaphragm 3, the air side diaphragm 3 is arranged adjacent to the cylinder body 1, and the oil side diaphragm 3 is arranged adjacent to the oil cylinder body 2.

[0038] The diaphragm compressor of the embodiment of the present invention can effectively prevent the diaphragm 3 from hitting the cylinder body 2 because the oil pressure in the oil chamber 6 is always in a positive pressure state, thereby protecting the diaphragm 3 from damage, and increasing the service life of the diaphragm 3, thereby increasing the service life of the diaphragm compressor, and preventing the diaphragm 3 from contaminating the compressed working fluid due to fragments generated by hitting the cylinder body, thereby improving the operating reliability of the diaphragm compressor equipment and reducing the maintenance cost of the diaphragm compressor equipment.

[0039] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A membrane head assembly, characterized in that: include: A cylinder body (1), an oil cylinder body (2), a diaphragm (3) and a piston (4), wherein the cylinder body (1) is connected to the oil cylinder body (2), the diaphragm (3) is arranged between the cylinder body (1) and the oil cylinder body (2), an air cavity (5) is defined between the cylinder body (1) and the diaphragm (3), an oil cavity (6) is defined between the oil cylinder body (2) and the diaphragm (3), an air intake valve (7) and an exhaust valve (8) are provided on the cylinder body (1), a piston cavity (201) is provided on the oil cylinder body (2), the piston (4) is arranged in the piston cavity (201) and can reciprocate in the piston cavity (201), and the oil cylinder body (2) also has a compression channel (202) and an expansion channel (203) which communicate the piston cavity (201) with the oil cavity (6); a compression check valve (9) and an expansion check valve (10), wherein the compression check valve (9) is arranged in the compression passage (202) and its outlet end is arranged toward the oil chamber (6), and the expansion check valve (10) is arranged in the expansion passage (203) and its outlet end is arranged toward the piston chamber (201), and the opening pressure of the expansion check valve (10) is less than the suction pressure of the intake valve (7); An oil replenishment component (11) and an oil overflow component (12), wherein the oil replenishment component (11) and the oil overflow component (12) are used to replenish oil and drain oil from the oil chamber (6), respectively; When the piston (4) moves downward, the diaphragm (3) separates from the upper surface of the air chamber (5) and begins to move downward, the oil overflow assembly (12) is closed, the oil pressure in the oil chamber (6) is still high, the expansion check valve (10) is opened, the hydraulic oil in the oil chamber (6) enters the piston chamber (201) through the expansion check valve (10), the volume of the hydraulic oil in the oil chamber (6) increases and begins to expand, the oil pressure in the oil chamber (6) begins to decrease, and the diaphragm (3) begins to deform downward under the action of the hydraulic oil; as the piston (4) continues to move downward, when the oil chamber (6) When the oil pressure in the oil chamber (6) continues to decrease to the suction pressure of the intake valve (7), the intake valve (7) opens and starts to inhale, and during the suction process, the oil replenishing component (11) injects a certain volume of hydraulic oil into the oil chamber (6) for replenishing oil; when the hydraulic oil pressure in the oil chamber (6) continues to decrease to the opening pressure of the expansion check valve (10), the expansion check valve (10) closes; when the piston (4) continues to move downward, the oil pressure in the oil chamber (6) remains unchanged, and the oil pressure in the piston chamber (201) continues to decrease, thereby ensuring that the oil pressure in the oil chamber (6) is always in a positive pressure state.

2. The membrane head assembly according to claim 1, characterized in that: The opening pressure of the compression check valve (9) is lower than the exhaust pressure of the exhaust valve (8).

3. The membrane head assembly according to claim 2, characterized in that: There are a plurality of compression channels (202), and each compression channel (202) is provided with a compression one-way valve (9).

4. The membrane head assembly according to claim 3, characterized in that: There are a plurality of expansion channels (203), and each expansion channel (203) is provided with an expansion check valve (10).

5. The membrane head assembly according to claim 1, characterized in that: The cylinder body (1) is connected to the oil cylinder body (2) via stud bolts (13), and the number of stud bolts (13) is multiple.

6. The membrane head assembly according to claim 1, characterized in that: The cylinder body (1) is provided with an intake passage (101) and an exhaust passage (102) which are in communication with the air chamber (5); the intake valve (7) is arranged in the intake passage (101), and the exhaust valve (8) is arranged in the exhaust passage (102).

7. The membrane head assembly according to claim 1, characterized in that: The oil replenishment assembly (11) comprises an oil replenishment pump, an oil inlet pipeline (1101) and an oil replenishment valve (1102); the inlet end of the oil inlet pipeline (1101) is in communication with the oil replenishment pump, the outlet end of the oil inlet pipeline (1101) is in communication with the oil chamber (6), and the oil replenishment valve (1102) is arranged on the oil inlet pipeline (1101).

8. The membrane head assembly according to claim 7, characterized in that: The oil overflow assembly (12) comprises an oil outlet pipeline (1201) and an oil overflow valve (1202); the inlet end of the oil outlet pipeline (1201) is in communication with the oil chamber (6); the outlet end of the oil outlet pipeline (1201) is arranged outside the oil chamber (6); and the oil overflow valve (1202) is arranged on the oil overflow pipeline.

9. The membrane head assembly according to any one of claims 1 to 8, characterized in that: The diaphragm (3) comprises an air side diaphragm, an intermediate diaphragm and an oil side diaphragm, the intermediate diaphragm being arranged between the air side diaphragm and the oil side diaphragm, the air side diaphragm being arranged adjacent to the cylinder body (1), and the oil side diaphragm being arranged adjacent to the oil cylinder body (2).

10. A diaphragm compressor, characterized in that: A membrane head assembly comprising any one of claims 1-9.

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