Diaphragm compressor oil cavity structure and diaphragm compressor

Abstract

The application relates to the technical field of diaphragm compressors, in particular to a diaphragm compressor oil cavity structure and a diaphragm compressor. The diaphragm compressor oil cavity structure comprises the following: an oil side membrane head is provided with an oil distribution disc and an oil cylinder sleeve; a piston is arranged in the oil cylinder sleeve; a diaphragm is arranged between the oil distribution disc and the gas distribution disc; a space between the diaphragm and the piston constitutes an oil cavity; a flow inducer is arranged in the oil cavity between the oil distribution disc and the oil cylinder sleeve, and the flow inducer is suitable for guiding hydraulic oil to flow from the periphery of the flow inducer so as to block the hydraulic oil from directly impacting the central area of the diaphragm. According to the application, the flow inducer is arranged in the oil cavity, the hydraulic oil driven by the piston first passes through the flow inducer to change the flow field characteristics, the flow of the hydraulic oil after the flow induction is more uniform, and then the diaphragm is driven to deform through the oil distribution disc; the hydraulic oil after the flow induction no longer impacts the central area of the diaphragm, the deformation environment of the diaphragm is improved; the impact force of the hydraulic oil on the central area of the diaphragm is eliminated, the service life of the diaphragm is prolonged, and the efficiency of the diaphragm compressor is improved.

Description

Technical Field

[0001] This invention relates to the field of diaphragm compressor technology, specifically to a diaphragm compressor oil chamber structure and a diaphragm compressor. Background Technology

[0002] Diaphragm compressors are a type of positive displacement compressor. Due to their advantages of good sealing performance, wide pressure range, and large compression ratio, they are widely used in petrochemical fields such as hydrogen refueling stations to compress and transport various high-purity gases, precious and rare gases, toxic and harmful gases, or corrosive gases.

[0003] The diaphragm compressor's main body consists of a gas-side diaphragm head, an oil-side diaphragm head, and a diaphragm. The gas-side and oil-side diaphragm heads sandwich the diaphragm and are detachably connected by a set of bolts. The peripheral portion of the diaphragm is fixed and supported by the oil-side and gas-side diaphragm heads, while the middle portion of the diaphragm forms an "oil-side diaphragm cavity" with the oil-side diaphragm head, and a "gas-side diaphragm cavity" with the gas-side diaphragm head. The oil-side diaphragm cavity is filled with hydraulic oil, and the gas-side diaphragm cavity is filled with the working fluid to be compressed. A piston driven by a crank-connecting rod structure pushes the hydraulic oil in the oil-side diaphragm cavity, thereby driving the diaphragm to deform and compress the gas-side diaphragm cavity, achieving the compression and exhaust of the working fluid. Therefore, the diaphragm compressor relies on a piston pushing hydraulic oil, which in turn drives the diaphragm to flex and deform, thus compressing gases and other working fluids. In the oil cavity structure of a traditional diaphragm compressor, the hydraulic oil pushed by the piston passes through an oil groove or distribution hole and directly impacts the diaphragm. Because the piston is located in the center of the oil chamber, the hydraulic oil causes the central area of ​​the diaphragm to experience the greatest impact force, leading to misalignment of the diaphragm's flexural deformation. The center of the diaphragm will prematurely adhere to the exhaust port of the gas-side diaphragm chamber, forming a closed volume, resulting in reduced efficiency of the diaphragm compressor and a sharp decrease in the diaphragm's lifespan. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the diaphragm compressor, where the piston is located in the center of the oil chamber, the hydraulic oil has too great an impact on the central area of ​​the diaphragm, resulting in diaphragm flexure deformation disorder and a sharp reduction in diaphragm life, as well as a reduction in the efficiency of the diaphragm compressor.

[0005] To overcome the above-mentioned defects, the present invention provides a diaphragm compressor oil chamber structure, comprising:

[0006] The oil-side film head is equipped with an oil distribution plate and an oil cylinder liner; a piston is installed inside the oil cylinder liner.

[0007] The air-side membrane head is equipped with an air distribution plate;

[0008] A diaphragm is disposed between the oil distribution plate and the air distribution plate; the space between the diaphragm and the piston forms an oil chamber; the piston is adapted to reciprocate within the cylinder liner to drive hydraulic oil to flow within the oil chamber;

[0009] A flow deflector is disposed in the oil cavity between the oil distribution plate and the cylinder liner. The flow deflector is adapted to guide hydraulic oil to flow from the periphery of the flow deflector to prevent the hydraulic oil from directly impacting the central area of ​​the diaphragm.

[0010] Optionally, a cap is provided on the flow coil at a position directly opposite the center region of the diaphragm.

[0011] Optionally, the flow diffuser and the cover are integrated into one unit.

[0012] Optionally, the flow diffuser has an "I" shaped structure, with both ends of the "I" shaped structure being crescent-shaped.

[0013] Optionally, the flow diffuser is fixed to the oil-side film head by fasteners.

[0014] Optionally, a cooling structure is provided within the flow coil.

[0015] Optionally, the cooling structure includes:

[0016] Microchannels are disposed within the flow coil;

[0017] A microchannel inlet, connected to a microchannel, wherein the microchannel inlet is suitable for introducing refrigerant;

[0018] A microchannel outlet, connected to the microchannel, is suitable for discharging refrigerant.

[0019] Optionally, the cooling structure is connected to both the refrigerant inlet and the refrigerant outlet provided on the oil-side film head; the refrigerant inlet is adapted to introduce refrigerant; and the refrigerant outlet is adapted to discharge refrigerant.

[0020] Optionally, both the refrigerant inlet and the refrigerant outlet are connected to an external refrigeration unit via pipelines.

[0021] The present invention also provides a diaphragm compressor, including the aforementioned diaphragm compressor oil chamber structure.

[0022] The technical solution of the present invention has the following advantages compared with the prior art:

[0023] 1. The diaphragm compressor oil chamber structure provided by the present invention includes: an oil-side diaphragm head, provided with an oil distribution plate and an oil cylinder liner; a piston is provided inside the oil cylinder liner; an air-side diaphragm head, provided with an air distribution plate; a diaphragm, disposed between the oil distribution plate and the air distribution plate; the space between the diaphragm and the piston forms an oil chamber; the piston is adapted to reciprocate within the oil cylinder liner to drive hydraulic oil to flow within the oil chamber; a flow deflector is disposed within the oil chamber between the oil distribution plate and the oil cylinder liner, the flow deflector being adapted to guide hydraulic oil to flow from the periphery of the flow deflector to prevent hydraulic oil from directly impacting the central area of ​​the diaphragm; the present application adopts the above technical solution, by setting a flow deflector in the oil chamber, the hydraulic oil driven by the piston first passes through the flow deflector to change the flow field characteristics, the hydraulic oil after the flow deflector will flow more uniformly, and then the diaphragm is driven to deform by the oil distribution plate; the hydraulic oil after being rectified by the flow deflector no longer impacts the central area of ​​the diaphragm, improving the deformation environment of the diaphragm; eliminating the impact force of hydraulic oil on the central area of ​​the diaphragm, extending the life of the diaphragm, and improving the efficiency of the diaphragm compressor.

[0024] 2. The present invention provides a cover on the flow coiler at a position directly opposite the center region of the diaphragm; the present application adopts the above technical solution, and the cover serves to seal and bear pressure.

[0025] 3. The flow coiler and the cover are integrally formed in this invention; the above technical solution is adopted in this application to further improve the overall strength of the flow coiler and the cover, and improve the reliability of sealing and pressure bearing.

[0026] 4. The flow winding of the present invention has an "I" shaped structure, and both ends of the "I" shaped structure are crescent-shaped; the present application adopts the above technical solution, which has a simple structure, is easy to manufacture, and has a lower cost.

[0027] 5. The flow diffuser of the present invention is fixed to the oil-side film head by fasteners; the present application adopts the above technical solution, and the installation of the flow diffuser is more secure.

[0028] 6. The present invention provides a cooling structure within the flow coil; the present application adopts the above technical solution, with a built-in cooling structure in the flow coil, the flow coil can further serve as an evaporator, playing a role in cooling and heat dissipation, and the structure is compact; when the hydraulic oil flows through the flow coil, the hydraulic oil can be fully cooled; the heat exchange between the hydraulic oil and the outside world is enhanced, the oil temperature is effectively reduced, the hydraulic oil temperature is controlled within a suitable working range, the aging of the hydraulic oil is slowed down; and the life of the diaphragm compressor is improved.

[0029] 7. The cooling structure of the present invention includes: a microchannel disposed within the flow coil; a microchannel inlet communicating with the microchannel, the microchannel inlet being adapted to introduce refrigerant; and a microchannel outlet communicating with the microchannel, the microchannel outlet being adapted to discharge refrigerant. The present application adopts the above technical solution to increase the heat dissipation area and maximize the efficiency of cooling heat exchange.

[0030] 8. The cooling structure of the present invention is connected to both the refrigerant inlet and the refrigerant outlet provided on the oil-side film head; the refrigerant inlet is suitable for introducing refrigerant; the refrigerant outlet is suitable for discharging refrigerant; the present application adopts the above technical solution to reliably introduce and discharge refrigerant.

[0031] 9. In this invention, both the refrigerant inlet and the refrigerant outlet are connected to an external refrigeration unit via pipelines; this application adopts the above technical solution to provide a stable and reliable refrigerant.

[0032] 10. The diaphragm compressor provided by the present invention includes the aforementioned diaphragm compressor oil chamber structure; the present application adopts the above technical solution, by setting a flow bypass in the oil chamber, the piston-driven hydraulic oil first passes through the flow bypass to change the flow field characteristics, the hydraulic oil after the flow bypass will flow more uniformly, and then drives the diaphragm to deform through the oil distribution plate; the hydraulic oil after being rectified by the flow bypass no longer impacts the central area of ​​the diaphragm, improving the deformation environment of the diaphragm; eliminating the impact force of hydraulic oil on the central area of ​​the diaphragm, extending the life of the diaphragm, and improving the efficiency of the diaphragm compressor. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a cross-sectional view of the diaphragm compressor oil chamber structure provided in an embodiment of the present invention.

[0035] Figure 2 This is a three-dimensional structural diagram of the flow coil provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of the flow coil mounting location provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the flow of hydraulic oil in the oil chamber structure of a diaphragm compressor according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the internal structure of the flow coil provided in an embodiment of the present invention;

[0039] Figure 6 This is a cross-sectional view of the diaphragm compressor oil chamber structure connected to an external refrigeration unit, as provided in an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Oil-side diaphragm head; 2. Gas-side diaphragm head; 3. Oil distribution plate; 4. Gas distribution plate; 5. Diaphragm; 6. Cylinder liner; 7. Piston; 8. Flow coiler; 9. Refrigerant inlet; 10. Refrigerant outlet; 11. Refrigeration unit; 12. Bolt hole; 13. Cap; 14. Microchannel; 15. Microchannel inlet; 16. Microchannel outlet. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] like Figures 1 to 6 One specific embodiment of the diaphragm compressor oil chamber structure shown includes: an oil-side diaphragm head 1 and a gas-side diaphragm head 2 connected together, a diaphragm 5, and a flow coil 8.

[0047] like Figure 1 and Figure 4As shown, the oil-side diaphragm head 1 is provided with an oil distribution plate 3 and an oil cylinder sleeve 6, with the oil cylinder sleeve 6 located on the central axis of the oil-side diaphragm head 1; a piston 7 is provided inside the oil cylinder sleeve 6; the air-side diaphragm head 2 is provided with an air distribution plate 4; the diaphragm 5 is disposed between the oil distribution plate 3 and the air distribution plate 4, specifically, the diaphragm 5 is fixedly supported between the oil distribution plate 3 and the air distribution plate 4; the space between the diaphragm 5 and the piston 7 forms an oil cavity; the piston 7 is adapted to reciprocate within the oil cylinder sleeve 6 to drive the hydraulic oil to flow within the oil cavity; the flow deflector 8 is disposed within the oil cavity between the oil distribution plate 3 and the oil cylinder sleeve 6, and the flow deflector 8 is adapted to guide the hydraulic oil to flow from the periphery of the flow deflector 8 to prevent the hydraulic oil from directly impacting the central area of ​​the diaphragm 5. The piston 7 drives the hydraulic oil to move, and the flow of the hydraulic oil along the central axis of the oil cavity is blocked by the flow deflector 8. The hydraulic oil bypasses the diffuser 8, flowing past its sides. This bypassing of the diffuser results in a more uniform flow of the hydraulic oil, preventing it from impacting the diaphragm 5 along the centerline. Figure 4 The arrows in the diagram indicate the direction of hydraulic oil flow.

[0048] like Figure 2 and Figure 3 As shown, a cover 13 is provided on the flow coiler 8 at a position directly opposite the center region of the diaphragm 5. The flow coiler 8 and the cover 13 are integrally formed, specifically, they can be welded together for use in high-pressure or ultra-high-pressure diaphragm compressors. The flow coiler 8 has an "I"-shaped structure, with both ends of the "I"-shaped structure being crescent-shaped. The flow coiler 8 is fixed to the oil-side diaphragm head 1 by fasteners. Specifically, bolt holes 12 are provided on the crescent-shaped portions on both sides of the flow coiler 8, and bolts are passed through the bolt holes 12 to fix the flow coiler 8 to the oil-side diaphragm head 1.

[0049] When diaphragm compressors are used in high-pressure environments such as hydrogen refueling stations, the hydraulic oil pressure typically reaches 100 MPa or even higher. Under high pressure, hydraulic oil has a certain degree of compressibility. In practical applications, hydraulic oil is not a pure liquid; that is, it is difficult to guarantee the purity of the hydraulic oil in a diaphragm compressor. It generally contains some gas in the form of tiny bubbles, and these gases themselves have a certain degree of solubility in the hydraulic oil. Hydraulic oil mixed with gas generates heat during compression, and the higher the pressure, the greater the heat generated. To ensure the structural strength and rigidity of the diaphragm compressor, the oil chamber wall is very thick, resulting in poor heat dissipation from the hydraulic oil. These factors lead to generally excessively high hydraulic oil temperatures in high-pressure diaphragm compressors; the oil pressure in diaphragm compressors used in hydrogen refueling stations can reach 100 MPa, and when the oil pressure exceeds 100 MPa, the oil temperature can reach 110℃. The suitable operating temperature for hydraulic oil is no more than 60℃; prolonged exposure to high temperatures accelerates the aging of the hydraulic oil. High temperatures also reduce the viscosity of the hydraulic oil, increasing leakage. Prolonged exposure of the piston to high-temperature hydraulic oil accelerates piston ring aging, reduces piston ring life, and increases machine failure rate. The coordinated operation of the gas-solid-liquid system means that diaphragm deformation is highly susceptible to the characteristics of the hydraulic oil flow field. The design of the oil chamber structure has a significant impact on the efficiency and diaphragm life of the diaphragm compressor.

[0050] Therefore, as Figure 1 , Figure 5 and Figure 6 As shown, a cooling structure is provided inside the flow coiler 8. The cooling structure includes a microchannel inlet 15, a microchannel 14, and a microchannel outlet 16 connected in sequence. The microchannel 14 is disposed inside the flow coiler 8; the microchannel inlet 15 is adapted to introduce refrigerant; and the microchannel outlet 16 is adapted to discharge refrigerant. The cooling structure is connected to the refrigerant inlet 9 and refrigerant outlet 10 provided on the oil-side film head 1; the refrigerant inlet 9 is adapted to introduce refrigerant; and the refrigerant outlet 10 is adapted to discharge refrigerant. Both the refrigerant inlet 9 and refrigerant outlet 10 are connected to an external refrigeration unit 11 via pipelines. The condensed refrigerant is introduced into the microchannel 14 inside the flow coiler 8 through the refrigerant inlet 9 and the microchannel inlet 15. The refrigerant evaporates and absorbs heat within the internal microchannel 14, carrying away a large amount of heat and achieving cooling of the oil cavity. The evaporated refrigerant returns to the refrigeration unit 11 through the microchannel outlet 16 and the refrigerant outlet 10, completing the working cycle.

[0051] The present invention also provides a diaphragm compressor, including the aforementioned diaphragm compressor oil chamber structure.

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A diaphragm compressor oil chamber structure, characterized in that, include: The oil-side film head (1) is provided with an oil distribution plate (3) and an oil cylinder liner (6); a piston (7) is provided inside the oil cylinder liner (6); The air-side membrane head (2) is equipped with an air distribution plate (4); A diaphragm (5) is disposed between the oil distribution plate (3) and the air distribution plate (4); the space between the diaphragm (5) and the piston (7) forms an oil cavity; the piston (7) is adapted to reciprocate within the cylinder liner (6) to drive hydraulic oil to flow within the oil cavity; The flow diffuser (8) is located in the oil cavity between the oil distribution plate (3) and the cylinder liner (6). The flow diffuser (8) is adapted to guide hydraulic oil to flow from the periphery of the flow diffuser (8) to prevent the hydraulic oil from directly impacting the central area of ​​the diaphragm (5). The flow diffuser (8) is fixed to the oil-side diaphragm head (1) by fasteners and is spaced apart from the oil distribution plate (3). A cooling structure is provided in the flow diffuser (8).

2. The diaphragm compressor oil chamber structure according to claim 1, characterized in that, A cap (13) is provided on the flow coil (8) at a position directly opposite the center region of the diaphragm (5).

3. The diaphragm compressor oil chamber structure according to claim 2, characterized in that, The flow coil (8) and the cover (13) are integrated into one unit.

4. The diaphragm compressor oil chamber structure according to claim 1, characterized in that, The flow winding (8) has an "I" shaped structure, and both ends of the "I" shaped structure are crescent-shaped.

5. The diaphragm compressor oil chamber structure according to claim 1, characterized in that, The cooling structure includes: Microchannel (14) is disposed within the flow coil (8); The microchannel inlet (15) is connected to the microchannel (14), and the microchannel inlet (15) is suitable for introducing refrigerant; Microchannel outlet (16) is connected to microchannel (14) and the microchannel outlet (16) is adapted to discharge refrigerant.

6. The diaphragm compressor oil chamber structure according to claim 1, characterized in that, The cooling structure is connected to the refrigerant inlet (9) and refrigerant outlet (10) provided on the oil-side film head (1); the refrigerant inlet (9) is suitable for introducing refrigerant; the refrigerant outlet (10) is suitable for discharging refrigerant.

7. The diaphragm compressor oil chamber structure according to claim 6, characterized in that, The refrigerant inlet (9) and refrigerant outlet (10) are both connected to the external refrigeration unit (11) through pipelines.

8. A diaphragm compressor, characterized in that, The diaphragm compressor oil chamber structure includes any one of claims 1-7.

Images