Diaphragm compressor

Abstract

The diaphragm compressor comprises an oil side diaphragm head and a piston assembly, and the oil side diaphragm head is provided with an oil side diaphragm cavity and a through hole which are arranged in the axial direction of the oil side diaphragm head and communicate with each other; the piston assembly comprises a piston rod, a first guide piece and a piston head, and at least part of the piston rod movably penetrates through the through hole; the first guide piece is movably arranged in the through hole and located on the side, close to the oil side film cavity, of the piston rod. The piston head is arranged in the through hole and located on the side, close to the oil side film cavity, of the first guiding piece. The piston head is hermetically connected with the oil side diaphragm head; wherein the piston rod, the first guide piece and the piston head can move in the axial direction, and when the piston rod moves in the direction close to the oil side film cavity in the axial direction, the first guide piece abuts against the piston rod and the piston head. The piston head, the first guide piece and the piston rod are independent of one another and are not connected, the centering performance of the piston rod and the through hole does not directly affect the centering performance of the piston and the through hole, and eccentric wear and clamping of the piston are avoided.

Description

Technical Field

[0001] This application belongs to the field of diaphragm compressor technology, and specifically relates to a diaphragm compressor. Background Technology

[0002] Diaphragm compressors are suitable for high-pressure and ultra-high-pressure operating environments due to their superior sealing performance. Under high-pressure conditions, the sealing of the oil piston is crucial to the service life of the diaphragm compressor. The oil piston is driven by a crank-connecting rod mechanism, and the alignment between the oil piston and the piston cylinder is ensured by the machining and assembly precision of components such as the compressor crankcase, cylinder body, crosshead, and cylinder. The higher the operating pressure, the more difficult it is to seal the oil piston, and the higher the requirements for the alignment between the oil piston and piston cylinder. When the alignment between the oil piston and piston cylinder is not met, it will lead to uneven wear of the oil piston, causing the compressor to malfunction. Utility Model Content

[0003] Purpose of the utility model: This application provides a diaphragm compressor, which aims to solve the problem that when the alignment between the existing oil piston and piston cylinder cannot meet the requirements, it will cause uneven wear of the oil piston and prevent the compressor from working properly.

[0004] Technical solution: A diaphragm compressor according to an embodiment of this application includes:

[0005] An oil-side film head has an oil-side film cavity and a through hole arranged along the axial direction of the oil-side film head, wherein the oil-side film cavity communicates with the through hole;

[0006] Piston assembly, including:

[0007] The piston rod is at least partially movable within the through hole;

[0008] The first guide member is movably disposed within the through hole and located on the side of the piston rod near the oil-side film cavity;

[0009] A piston head is disposed within the through hole and located on the side of the first guide member near the oil-side film cavity; the piston head is sealed to the oil-side film head.

[0010] The piston rod, the first guide member, and the piston head are all movable along the axial direction. When the piston rod moves along the axial direction toward the direction close to the oil-side film cavity, the first guide member abuts against the piston rod and the piston head respectively.

[0011] In some embodiments, the first guide is spherical and can make point contact with the piston head and the piston rod, respectively.

[0012] In some embodiments, the piston rod includes:

[0013] The rod body, at least partially movable, passes through the through hole;

[0014] The second guide member is connected to the side of the rod body near the first guide member, and the second guide member can abut against the first guide member.

[0015] In some embodiments,

[0016] The second guide member has a first side facing the first guide member;

[0017] The piston head has a second side facing the first guide member;

[0018] Both the first side and the second side are planes perpendicular to the axial direction.

[0019] In some embodiments, the hardness of the piston head and the hardness of the second guide are both less than the hardness of the first guide.

[0020] In some embodiments, the piston head and the second guide are both copper alloy parts, and the first guide is an alloy steel ball.

[0021] In some embodiments,

[0022] The rod body is provided with a mounting hole on the side near the first guide member;

[0023] The second guide includes:

[0024] The body is connected to the rod, and the side of the body away from the rod is used to abut against the first guide member;

[0025] A positioning protrusion is connected to the side of the body away from the first guide member. The positioning protrusion is inserted into the mounting hole and connected to the rod.

[0026] In some embodiments, the diameter of the first guide is equal to the diameter of the through hole.

[0027] In some embodiments, the piston head, the first guide member, and the through hole share a common central axis.

[0028] In some embodiments, when the piston rod moves to its furthest distance along the axial direction, the piston head is located within the through hole.

[0029] In some embodiments, the outer diameter of the piston rod is smaller than the diameter of the through hole.

[0030] In some embodiments, the diaphragm compressor further includes:

[0031] An air-side die head is connected to the oil-side die head and is located on the side of the oil-side die cavity away from the through hole; the air-side die head has an air-side mold cavity on the side facing the oil-side die head;

[0032] A diaphragm is disposed between the gas-side diaphragm head and the oil-side diaphragm head, and respectively covers the gas-side diaphragm cavity and the oil-side diaphragm cavity with the gas-side diaphragm head and the oil-side diaphragm head;

[0033] A drive structure is disposed on the side of the oil-side film head away from the gas-side film head. The output end of the drive structure is connected to the end of the piston rod away from the first guide member, and is used to drive the piston assembly to move along the axial direction.

[0034] Beneficial effects: Compared with the prior art, a diaphragm compressor according to an embodiment of this application includes an oil-side diaphragm head and a piston assembly. The oil-side diaphragm head has an oil-side diaphragm cavity and a through hole arranged axially along the oil-side diaphragm head, and the oil-side diaphragm cavity communicates with the through hole. The piston assembly includes a piston rod, a first guide member, and a piston head. The piston rod is at least partially movably disposed within the through hole. The first guide member is movably disposed within the through hole and located on the side of the piston rod near the oil-side diaphragm cavity. The piston head is disposed within the through hole and located on the side of the first guide member near the oil-side diaphragm cavity. The piston head is sealed to the oil-side diaphragm head. The piston rod, the first guide member, and the piston head are all axially movable. When the piston rod moves axially toward the direction near the oil-side diaphragm cavity, the first guide member abuts against the piston rod and the piston head respectively. In this embodiment of the piston assembly, the piston head, the first guide member, and the piston rod are independent and not connected to each other. The three have a high degree of freedom. The alignment of the piston rod with the through hole does not directly affect the alignment of the piston with the through hole. The piston is in a floating state within the through hole. The driving force of the piston rod is transmitted to the piston through the movable first guide member. The direction of the driving force of the piston rod can be adjusted through the first guide member, thereby ensuring better alignment between the piston and the through hole. This is not affected by machining and assembly precision, and can avoid the phenomenon of piston wear and jamming, making the piston seal more reliable. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a diaphragm compressor according to an embodiment of this application;

[0037] Figure 2 yes Figure 1 Enlarged view of section A;

[0038] Figure 3 This is an exploded view of the piston rod of a diaphragm compressor according to an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the initial state of a piston assembly of a diaphragm compressor according to an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of the force direction of the piston head of a diaphragm compressor under compression conditions according to an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the force direction of the piston head of a diaphragm compressor under intake conditions, according to an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100, Oil-side diaphragm head; 110, Oil-side diaphragm cavity; 120, Through hole; 200, Piston assembly; 210, Piston rod; 211, Rod body; 212, Second guide; 2121, Body; 2122, Positioning protrusion; 213, First side surface; 214, Mounting hole; 220, First guide; 230, Piston head; 231, Second side surface; 300, Hydraulic oil; 400, Air-side diaphragm head; 410, Air-side diaphragm cavity; 500, Diaphragm; 600, Drive structure; X, Axial direction. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0045] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0046] Please refer to the following: Figure 1 , Figure 2 , Figure 3 and Figure 4 This application provides a diaphragm compressor, including an oil-side diaphragm head 100 and a piston assembly 200. The oil-side diaphragm head 100 has an oil-side diaphragm cavity 110 and a through hole 120 arranged along the axial direction X of the oil-side diaphragm head 100, and the oil-side diaphragm cavity 110 communicates with the through hole 120. The piston assembly 200 includes a piston rod 210, a first guide member 220, and a piston head 230. The piston rod 210 is at least partially movably disposed within the through hole 120. The first guide member 220 is movably disposed within the through hole 120 and is located on the side of the piston rod 210 near the oil-side diaphragm cavity 110. The piston head 230... 30 is disposed in the through hole 120 and located on the side of the first guide member 220 near the oil-side film cavity 110; the piston head 230 is sealed to the oil-side film head 100; wherein, the piston rod 210, the first guide member 220 and the piston head 230 are all movable along the axial direction X. When the piston rod 210 moves along the axial direction X toward the direction near the oil-side film cavity 110, the first guide member 220 abuts against the piston rod 210 and the piston head 230 respectively, and the first guide member 220 and the piston head 230 move with the piston rod 210 toward the direction near the oil-side mold cavity.

[0047] In this embodiment, the piston head 230, the first guide member 220, and the piston rod 210 of the piston assembly 200 are independent and not connected to each other. The three have a high degree of freedom. The alignment of the piston rod 210 with the through hole 120 does not directly affect the alignment of the piston with the through hole 120. The piston is in a floating state within the through hole 120. The driving force of the piston rod 210 is transmitted to the piston through the movable first guide member 220. The direction of the driving force of the piston rod 210 can be adjusted through the first guide member 220, thereby better ensuring the alignment of the piston with the through hole 120. It is not affected by the machining and assembly precision, which can avoid the phenomenon of piston wear and jamming, and make the piston sealing more reliable.

[0048] Specifically, in this embodiment, the piston rod 210 is movably inserted into the through hole 120, and the piston rod 210 is connected to the output end of the drive structure 600 to reciprocate along the axial direction X within the through hole 120. The first guide member 220 is spaced between the piston rod 210 and the piston head 230, and is not connected to either the piston rod 210 or the piston head 230. The first guide member 220 can move within the through hole 120. Therefore, when the piston rod 210 moves axially X toward the oil-side diaphragm cavity 110, after the piston rod 210 reaches the position of the first guide member 220, it can push the first guide member 220 to continue moving toward the oil-side diaphragm cavity 110 until the first guide member 220 contacts the piston head 230. Under the push of the piston rod 210, the first guide member 220 transmits the pushing force of the piston rod 210 to the piston head 230, causing the piston head 230 to also move toward the oil-side diaphragm cavity 110, thus achieving the compression of the hydraulic oil 300. During this process, both the first guide member 220 and the piston head 230 are subjected to thrust, specifically as follows: Figure 5 As shown, the piston head 230 is subjected to a thrust F1, and the first guide member 220 is in contact with the piston rod 210 and the piston head 230.

[0049] It should be noted that, in this embodiment, the first guide member 220 is movably disposed between the piston head 230 and the piston rod 210, which not only enables force transmission but also achieves a non-fixed connection between the piston head 230 and the piston rod 210. This improves the flexibility of pairing the piston head 230 and the piston rod 210, reduces assembly difficulty and the requirements for dimensional errors of each component, and reduces the impact of non-alignment of the piston rod 210 on the piston head 230. This effectively avoids the piston head 230 from being worn and jammed, and improves the service life of the piston assembly 200.

[0050] It should also be noted that, in the embodiments of this application, the diaphragm compressor is separated and sealed by a diaphragm 500, including an oil-side diaphragm cavity 110 and a gas-side diaphragm cavity 410. The oil-side diaphragm cavity 110 is filled with hydraulic oil 300, and the through hole 120 is also filled with a portion of hydraulic oil 300. The hydraulic oil 300 is located on the side of the piston head 230 away from the first guide member 220. When hydraulic oil 300 needs to be squeezed towards the air-side diaphragm cavity 410, piston rod 210 moves towards the oil-side diaphragm cavity 110, pushing the first guide member 220 and piston head 230 together towards the oil-side diaphragm cavity 110. Since piston head 230 is sealed to the oil-side diaphragm head 100 (specifically, piston head 230 can be sealed to the inner wall of through hole 120, where the seal is a dynamic seal, and piston head 230 remains sealed to the inner wall of through hole 120 during its movement within the through hole 120), hydraulic oil 300 is prevented from overflowing to the side where the first guide member 220 and piston rod 210 are located. During the compression of the air-side diaphragm cavity 410, the first guide member 220 continuously transmits the thrust of piston rod 210 to piston head 230, continuously pushing piston head 230 towards the oil-side diaphragm cavity 110. After the compression action is completed, the piston rod 210 returns to its original position. At this time, the piston rod 210 and the first guide member 220 can be disconnected. The first guide member 220 and the piston head 230 are free from the thrust of the piston rod 210. However, gas will be gradually refilled into the gas-side diaphragm cavity 410. At this time, the gas pressure in the gas-side diaphragm cavity 410 will drive the diaphragm 500 to deform towards the side where the oil-side diaphragm cavity 110 is located and drive the hydraulic oil 300 to flow back. The hydraulic oil 300 flows back and pushes the piston head 230 to move away from the oil-side diaphragm cavity 110. The piston head 230 further pushes the first guide member 220 to move in the direction of retraction of the piston rod 210, thereby keeping the piston head 230, the first guide member 220 and the piston rod 210 moving synchronously away from the oil-side diaphragm cavity 110, and realizing the reset of the piston assembly 200.

[0051] It should also be noted that the first guide member 220 is not connected to the piston rod 210 or the piston head 230. Therefore, when the piston rod 210, the first guide member 220 and the piston head 230 abut in sequence, the direction of the force can be changed at the two middle abutment points. This ensures that the alignment of the piston rod 210 with the through hole 120 does not directly affect the alignment of the piston head 230 with the through hole 120. At the same time, since the piston head 230 is sealed to the inner wall of the through hole 120, the initial alignment of the piston head 230 with the through hole 120 is good. The first guide member 220 can interact, so it can adapt to the position of the piston head 230 to apply force, reducing the possibility of uneven wear between the piston head 230 and the inner wall of the through hole 120.

[0052] Please refer to the following: Figure 1, Figure 2 and Figure 4 In some embodiments, the first guide member 220 is spherical, and the first guide member 220 can make point contact with the piston head 230 and the piston rod 210 respectively.

[0053] In this embodiment, the first guide member 220 is spherical and can make point contact with the piston head 230 and the piston rod 210 respectively. At this time, it can be ensured that the driving force is transmitted vertically along the contact point, so that the driving force is applied vertically along the axial direction X, reducing the possibility of driving force deviation.

[0054] Furthermore, in some embodiments, the diameter of the first guide member 220 is equal to the diameter of the through hole 120. In this case, the contact point is located on the central axis of the through hole 120, and the corresponding driving force is also along the central axis of the through hole 120. This can prevent the piston head 230 from deflecting, which is beneficial to ensuring the sealing of the piston head 230 and further reducing the possibility of uneven wear of the piston head 230.

[0055] Please refer to the following: Figure 2 , Figure 3 and Figure 4 In some embodiments, the piston rod 210 includes a rod body 211 and a second guide member 212. The rod body 211 is at least partially movably inserted into the through hole 120. The second guide member 212 is connected to the side of the rod body 211 near the first guide member 220, and the second guide member 212 can abut against the first guide member 220.

[0056] In this embodiment, the piston rod 210 includes a rod body 211 and a second guide member 212. The rod body 211 is connected to the output end of the drive structure 600 to output driving force, and the second guide member 212 abuts against the first guide member 220 to transmit driving force. By making the second guide member 212 an independent structure, its structure can be flexibly configured to fit the diameter of the first guide member 220 and the through hole 120, effectively reducing the overall material usage of the piston rod 210 while ensuring that the piston rod 210 has sufficient pushing and guiding area.

[0057] like Figure 2 As shown, in some embodiments, the second guide 212 has a first side 213 facing the first guide 220; the piston head 230 has a second side 231 facing the first guide 220; both the first side 213 and the second side 231 are planes perpendicular to the axial direction X.

[0058] In this embodiment of the application, by setting the first side 213 and the second side 231 to be planes perpendicular to the axial direction X, and in conjunction with the spherical first guide member 220, the driving force of the piston rod 211 can be fully transmitted to the piston head 230, thereby improving driving efficiency, reducing energy loss, and also reducing the possibility of uneven wear of the piston head 230.

[0059] In some embodiments, the hardness of the piston head 230 and the hardness of the second guide member 212 are both less than the hardness of the first guide member 220.

[0060] In this embodiment, the hardness of the first guide member 220 is set to be greater than that of the piston head 230 and the second guide member 212. At this time, the rod body 211 can drive the second guide member 212 to abut against the first guide member 220. Then, when the first guide member 220 abuts against the piston head 230, the contact stress between the first guide member 220 and the second guide member 212 and the piston head 230 can be reduced, avoiding deformation of the first guide member, thereby ensuring the service life of the first guide member 220 and the accuracy of the driving force transmission, and reducing the possibility of force transmission deviation of the first guide member 220.

[0061] Preferably, the piston head 230 and the second guide member 212 can both be copper alloy parts, and the first guide member 220 is an alloy steel ball. Compared with alloy steel, copper alloy parts are softer, which allows the piston head 230 and the second guide member 212 to effectively prevent deformation of the first guide body when in contact with the first guide member 220.

[0062] like Figure 3 As shown, in some embodiments, the rod 211 has a mounting hole 214 on the side near the first guide member 220; the second guide member 212 includes a body 2121 and a positioning protrusion 2122. The body 2121 is connected to the rod 211, and the side of the body 2121 away from the rod 211 is used to abut against the first guide member 220; the positioning protrusion 2122 is connected to the side of the body 2121 away from the first guide member 220, and the positioning protrusion 2122 is inserted into the mounting hole 214 and connected to the rod 211.

[0063] In this embodiment, the above-described structure facilitates the connection and assembly of the second guide member 212 and the rod 211, while ensuring assembly stability. It also effectively guarantees the connection and contact between the second guide member 212 and the rod 211, ensuring force balance across all parts. Furthermore, the mounting hole 214 can be a threaded hole, and the positioning protrusion 2122 can have external threads on its outer side. The positioning protrusion 2122 is screwed into the mounting hole 214, which improves the ease of assembly between the second guide member 212 and the rod 211.

[0064] In some embodiments, the piston head 230, the first guide member 220, and the through hole 120 share a common central axis.

[0065] In this embodiment, the point of contact between the spherical first guide member 220 and the piston head 230 is located on the central axis of the piston head 230, the first guide member 220 and the through hole 120, which can further prevent the piston head 230 from getting stuck due to uneven wear and ensure the sealing performance of the piston head 230.

[0066] Furthermore, in some embodiments, the outer diameter of the piston rod 210 is smaller than the diameter of the through hole 120. This facilitates the reciprocating movement of the piston rod 210 within the through hole 120, reduces friction, simplifies the determination process, and minimizes wear.

[0067] In some embodiments, when the piston rod 210 moves to its furthest distance along the axial direction X, the piston head 230 is located within the through hole 120.

[0068] In this embodiment, the piston head 230, which has a high degree of freedom in the axial direction X, will not come out of the through hole 120, so that the piston head 230 is always located in the through hole 120 for piston movement, thus ensuring the overall reliability of the piston structure.

[0069] like Figure 1 As shown, in some embodiments, the diaphragm compressor of this application further includes a gas-side diaphragm head 400, a diaphragm 500, and a drive structure 600. The gas-side diaphragm head 400 has a gas-side cavity and is connected to the oil-side diaphragm head 100. The diaphragm 500 is disposed between the gas-side diaphragm head 400 and the oil-side diaphragm head 100, and is sealed to both the gas-side diaphragm head 400 and the oil-side diaphragm head 100 to cover the gas-side diaphragm cavity 410 and the oil-side diaphragm cavity 110. The oil-side diaphragm cavity 110 is filled with hydraulic oil 300. The piston assembly 200 moves toward the oil-side diaphragm cavity 110 to compress the hydraulic oil 300. The hydraulic oil 300 deforms the diaphragm 500 to compress the space of the gas-side diaphragm cavity 410, thereby achieving gas compression. After compression, the piston rod 210 retracts, and gas is continuously introduced into the gas-side mold cavity. The gas compresses the diaphragm 500, deforming it into the oil-side mold cavity 110, thereby compressing the hydraulic oil 300. The hydraulic oil 300 pushes the piston head 230 to move towards the piston rod 210. Figure 6As shown, at this time, the hydraulic oil 300 applies a thrust F2 to the piston head 230, and the piston head 230 moves towards the side where the piston rod 210 is located after being subjected to the force. During the movement, the piston head 230 pushes the first guide member 220 to move towards the piston rod 210, realizing the reciprocating movement of the piston head 230. During this process, the alignment of the piston head 230 with the through hole 120 of the oil-side film head 100 is not affected by the alignment of the piston rod 210 with the through hole 120, which can effectively reduce the wear of the piston head 230 and improve the sealing performance and service life of the piston head 230.

[0070] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0071] The diaphragm compressor provided in the embodiments of this application has been described in detail above, and specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solution and core idea of ​​this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A diaphragm compressor, characterized in that, include: An oil-side film head has an oil-side film cavity and a through hole arranged along the axial direction of the oil-side film head, wherein the oil-side film cavity communicates with the through hole; Piston assembly, including: The piston rod is at least partially movable within the through hole; The first guide member is movably disposed within the through hole and located on the side of the piston rod near the oil-side film cavity; A piston head is movably disposed within the through hole and located on the side of the first guide member near the oil-side film cavity; the piston head is sealed to the oil-side film head. The piston rod, the first guide member, and the piston head are all movable along the axial direction. When the piston rod moves along the axial direction toward the direction close to the oil-side film cavity, the first guide member abuts against the piston rod and the piston head respectively.

2. The diaphragm compressor according to claim 1, characterized in that, The first guide member is spherical and can make point contact with the piston head and the piston rod respectively.

3. The diaphragm compressor according to claim 2, characterized in that, The piston rod includes: The rod body, at least partially movable, passes through the through hole; The second guide member is connected to the side of the rod body near the first guide member, and the second guide member can abut against the first guide member.

4. The diaphragm compressor according to claim 3, characterized in that, The second guide member has a first side facing the first guide member; The piston head has a second side facing the first guide member; Both the first side and the second side are planes perpendicular to the axial direction.

5. The diaphragm compressor according to claim 3, characterized in that, The hardness of the piston head and the hardness of the second guide are both less than the hardness of the first guide.

6. The diaphragm compressor according to claim 5, characterized in that, Both the piston head and the second guide are copper alloy parts, and the first guide is an alloy steel ball.

7. The diaphragm compressor according to claim 3, characterized in that, The rod body is provided with a mounting hole on the side near the first guide member; The second guide includes: The body is connected to the rod, and the side of the body away from the rod is used to abut against the first guide member; A positioning protrusion is connected to the side of the body away from the first guide member. The positioning protrusion is inserted into the mounting hole and connected to the rod.

8. The diaphragm compressor according to claim 2, characterized in that, The diameter of the first guide is equal to the diameter of the through hole.

9. The diaphragm compressor according to claim 8, characterized in that, The piston head, the first guide member, and the through hole share a common central axis.

10. The diaphragm compressor according to claim 8, characterized in that, The outer diameter of the piston rod is smaller than the diameter of the through hole.

11. The diaphragm compressor according to claim 1, characterized in that, When the piston rod moves to its furthest distance along the axial direction, the piston head is located inside the through hole.

12. The diaphragm compressor according to claim 1, characterized in that, The diaphragm compressor also includes: An air-side membrane head is connected to the oil-side membrane head and is disposed on the side of the oil-side membrane cavity away from the through hole; the air-side membrane head has an air-side membrane cavity on the side facing the oil-side membrane head; A diaphragm is disposed between the gas-side diaphragm head and the oil-side diaphragm head, and respectively covers the gas-side diaphragm cavity and the oil-side diaphragm cavity with the gas-side diaphragm head and the oil-side diaphragm head; A drive structure is disposed on the side of the oil-side film head away from the gas-side film head. The output end of the drive structure is connected to the end of the piston rod away from the first guide member, and is used to drive the piston assembly to move along the axial direction.

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