Gas-liquid separation device

Abstract

The application relates to a gas-liquid separation device, which comprises a first pipe, a second pipe and a filter screen. The first pipe has a flow cavity. The second pipe is located at the outer periphery of the first pipe. A backflow cavity is formed between the second pipe and the first pipe, and the backflow cavity is communicated with the flow cavity. The gas-liquid separation device has a containing cavity. The second pipe has a suction inlet. The filter screen is fixedly connected or positionally connected with the second pipe. At least part of the filter screen is located at the suction inlet. The mesh holes of the filter screen are communicated with the containing cavity and the backflow cavity. Therefore, the filtering effect of the gas-liquid separation device on gaseous refrigerant can be improved.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, specifically to a gas-liquid separation device. Background Technology

[0002] The main function of a gas-liquid separator is to separate the gas and liquid phases of the refrigerant, ensuring that the refrigerant entering the compressor is gaseous.

[0003] In existing technology, after the gas-liquid two-phase refrigerant impacts the dispersing cup, it undergoes gas-liquid separation due to gravity. The liquid refrigerant mixed with refrigeration oil is stored at the bottom of the chamber, while the gaseous refrigerant is output through a U-shaped tube to the outlet of the gas-liquid separator. Since the filter of the gas-liquid separator is installed at the bottom of the U-shaped tube and connected to the oil return hole of the U-shaped tube, when the gaseous refrigerant flows to the oil return hole, it carries the liquid refrigerant mixed with refrigeration oil to the outlet of the gas-liquid separator.

[0004] In existing gas-liquid separation devices, liquid refrigerant mixed with refrigeration oil is filtered before entering the U-tube. However, gaseous refrigerant is not filtered before being output to the compressor through the outlet of the gas-liquid separation device, increasing the risk of compressor damage. Summary of the Invention

[0005] Therefore, it is necessary to provide a gas-liquid separation device that can improve the filtration effect of gaseous refrigerant in the gas-liquid separation device to address the above problems.

[0006] The technical solution adopted in this technical solution is as follows:

[0007] A gas-liquid separation device includes a first pipe, a second pipe, and a filter screen. The first pipe has a flow cavity, the second pipe is located on the outer periphery of the first pipe, and a return cavity is formed between the second pipe and the first pipe, the return cavity communicating with the flow cavity. The gas-liquid separation device has a receiving cavity, the second pipe has a suction port, and the filter screen is fixedly connected or limitedly connected to the second pipe, at least a portion of the filter screen is located at the suction port, and the mesh of the filter screen communicates with the receiving cavity and the return cavity.

[0008] In the gas-liquid separation device provided in this application, the filter screen is fixedly connected or limited to the second pipe fitting, and at least part of the filter screen is located at the suction port. The mesh of the filter screen connects the receiving cavity and the return cavity. In this way, the mesh of the filter screen connects the receiving cavity and the return cavity, and the gaseous refrigerant located in the receiving cavity can enter the return cavity after being filtered by the filter screen, and then flow into the flow cavity through the return cavity, which can improve the filtration effect of the gas-liquid separation device on the gaseous refrigerant. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural schematic diagram of the gas-liquid separation device provided in this application;

[0010] Figure 2 yes Figure 1 Top view of a gas-liquid separator;

[0011] Figure 3 yes Figure 2 Cross-sectional view of the gas-liquid separator along point AA;

[0012] Figure 4 yes Figure 3 Enlarged view of circle A in the gas-liquid separator;

[0013] Figure 5 yes Figure 2 Explosion diagram of a gas-liquid separator;

[0014] Figure 6 yes Figure 5 A schematic diagram of the structure of the first pipe component of the gas-liquid separator;

[0015] Figure 7 yes Figure 5 Another structural schematic diagram of the first pipe component of the gas-liquid separator;

[0016] Figure 8 yes Figure 2 A schematic diagram of the second pipe component of the gas-liquid separator;

[0017] Figure 9 yes Figure 8 A schematic diagram of the second pipe component of the gas-liquid separator from another perspective.

[0018] Explanation of key component symbols:

[0019] 100. Gas-liquid separator; 101. Receiving cavity; 10. Body; 20. End cap; 21. Extension; 211. Limiting groove; 22. Inlet; 23. Outlet; 24. Assembly cavity; 241. Slot; 242. Stepped wall; 30. Pipe assembly; 31. First pipe fitting; 311. Flow cavity; 312. Assembly section; 313. Guide section; 314. Pipe section; 32. Distributor; 321. Plate section; 322. Cover section; 323. Conical structure; 33. Limiting groove 34. Second fitting; 341. Inlet; 342. Equalization hole; 35. Return chamber; 351. First chamber; 352. Second chamber; 353. Third chamber; 36. First bracket; 361. First support member; 362. First annular member; 363. Through hole; 37. Second bracket; 371. Second support member; 372. Second annular member; 38. Oil return hole; 39. Filter screen; 40. Snap ring; 50. One-way valve; 60. Filter element; 70. Dryer element.

[0020] The above description of the main component symbols, together with the accompanying drawings and specific technical solutions, provides a more detailed explanation of the present invention. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention.

[0022] The present application will be further described below with reference to the accompanying drawings and specific technical solutions:

[0023] Figures 1 to 9 This diagram illustrates a technical solution for a gas-liquid separation device 100. The gas-liquid separation device 100 includes a pipe assembly 30, which includes a first pipe 31 and a second pipe 34. The gas-liquid separation device 100 includes a filter screen 39. The first pipe 31 has a flow cavity 311, and the second pipe 34 is located on the outer periphery of the first pipe 31. A return cavity 35 is provided between the second pipe 34 and the first pipe 31, and the return cavity 35 is connected to the flow cavity 311. The gas-liquid separation device 100 has a receiving cavity 101, and the second pipe 34 has a suction port 341. The filter screen 39 is fixedly connected or limited to the second pipe 34, and at least a portion of the filter screen 39 is located at the suction port 341. The suction port 341 is used for the flow of gaseous refrigerant, and the mesh of the filter screen 39 is connected to the receiving cavity 101 and the return cavity 35. In this embodiment, both the first pipe 31 and the second pipe 34 are plastic parts. The first pipe 31 and the second pipe 34 are coaxially arranged, and the second pipe 34 surrounds the outer periphery of the first pipe 31. Compared with the U-shaped pipe in the prior art, the coaxially arranged first pipe 31 and the second pipe 34 in this embodiment can occupy less space in the receiving cavity 101. It should be noted that the gaseous refrigerant located in the receiving cavity 101 will be filtered by the filter screen 39 in the flow path from the suction port 341 to the return cavity 35. The filter screen 39 has a good filtration effect on the gaseous refrigerant.

[0024] In addition, in some embodiments, there are at least two intake ports 341, which are arranged around the outer wall of the second pipe 34, so that the gaseous refrigerant in the receiving cavity 101 can be more smoothly transferred from the intake port 341 to the return cavity 35.

[0025] In the prior art, the gas-liquid separation device 100 filters the liquid refrigerant mixed with refrigeration oil that enters the U-tube. However, the gaseous refrigerant is not filtered and is output to the compressor through the outlet 23 of the gas-liquid separation device 100, which increases the risk of damaging the compressor.

[0026] In the gas-liquid separation device 100 provided in this application, the filter screen 39 is fixedly connected or limited to the second pipe 34. At least part of the filter screen 39 is located at the suction port 341. The mesh of the filter screen 39 connects the receiving cavity 101 and the return cavity 35. In this way, the mesh of the filter screen 39 connects the receiving cavity 101 and the return cavity 35. The gaseous refrigerant located in the receiving cavity 101 can enter the return cavity 35 after being filtered by the filter screen 39, and then flow to the flow cavity 311 through the return cavity 35. This can improve the filtration effect of the gas-liquid separation device 100 on the gaseous refrigerant.

[0027] Combination Figure 8 and Figure 9 As shown, the second pipe fitting 34 is injection molded with the filter screen 39 as an insert, and the filter screen 39 is injection molded and fixed to the second pipe fitting 34. It should be noted that since the second pipe fitting 34 is injection molded with the filter screen 39 as an insert, it is only necessary to restrict the second pipe fitting 34 to simultaneously restrict the filter screen 39, eliminating the need to install the filter screen 39 on the second pipe fitting 34. This simplifies the assembly process and improves assembly efficiency.

[0028] Combination Figure 3 and Figure 7 As shown, the first pipe fitting 31 includes an assembly portion 312, and at least a portion of the second pipe fitting 34 is press-fitted with the outer wall of the assembly portion 312. The first pipe fitting 31 has a balancing hole 342. Along the axial direction of the gas-liquid separator 100, in this embodiment, the gas-liquid separator 100 is as follows: Figure 3 As shown in the H direction. The assembly part 312 is far away from the bottom of the cavity forming the receiving cavity 101 relative to the equalization hole 342. The equalization hole 342 connects the flow cavity 311 and the return cavity 35. It should be noted that, since the assembly part 312 is far away from the bottom of the cavity forming the receiving cavity 101 relative to the equalization hole 342, at least part of the second pipe 34 is interference-fitted with the assembly part 312, which can play a certain sealing role. This can reduce the probability of gaseous refrigerant in the receiving cavity 101 leaking into the return cavity 35 from the joint between the assembly part 312 and the second pipe 34. This allows the gaseous refrigerant in the receiving cavity 101 to be filtered by the filter screen 39 located at the suction port 341 before entering the return cavity 35, which can improve the filtration effect of the gas-liquid separator 100 on the gaseous refrigerant.

[0029] The gas-liquid separator 100 includes a head 20 and a body 10. The head 20 is welded to the body 10. The head 20 includes an extension 21. Along the axial direction of the gas-liquid separator 100, the extension 21 extends toward the bottom wall of the cavity 101. The first pipe 31 includes a guide portion 313 and a pipe portion 314. The guide portion 313 is integrally formed with the assembly portion 312 and the pipe portion 314. The assembly portion 312 surrounds the outer periphery of the extension 21. Along the radial direction of the first pipe 31, the radial dimension of the assembly portion 312 is larger than the radial dimension of the pipe portion 314. The assembly portion 312 is in a limiting fit with the extension 21. Along the axial direction of the gas-liquid separator 100, the assembly portion 312 is closer to the head 20 relative to the guide portion 313, and the pipe portion 314 is closer to the bottom of the cavity 101 relative to the guide portion 313. The equalization hole 342 is located in the guide portion 313. It should be noted that the limiting cooperation between the assembly part 312 and the extension part 21 can effectively restrict the first pipe 31 within the extension part 21. Since the assembly part 312 is closer to the end cap 20 than the guide part 313, and the pipe part 314 is closer to the bottom of the cavity forming the receiving cavity 101 than the guide part 313, and the equalization hole 342 is located in the guide part 313, the gaseous refrigerant in the receiving cavity 101 enters the return cavity 35 after being filtered by the filter screen 39 located at the suction port 341. This improves the filtration effect of the gas-liquid separator 100 on the gaseous refrigerant.

[0030] Please refer to the following for details. Figure 3The gas-liquid separation device 100 includes a liquid dispersing component 32 and a filter component 60. The liquid dispersing component 32 is integrally formed with the first pipe component 31. Along the axial direction of the gas-liquid separation device 100, a portion of the liquid dispersing component 32 abuts against the end cap 20, and a portion of the liquid dispersing component 32 abuts against the second pipe component 34. One end of the second pipe component 34 abuts against the liquid dispersing component 32, and the other end of the second pipe component 34 is press-fitted with the filter component 60. The end of the filter component 60 away from the end cap 20 abuts against the bottom of the cavity forming the receiving cavity 101. In this embodiment, both the first pipe component 31 and the liquid dispersing component 32 are plastic parts, and the first pipe component 31 and the liquid dispersing component 32 are injection molded into an integral structure. It should be noted that, along the axial direction of the gas-liquid separation device 100, one end of the second pipe component 34 abuts against the liquid dispersing component 32, and the other end of the second pipe component 34 is press-fitted with the filter component 60. The end of the filter component 60 away from the end cap 20 abuts against the bottom of the cavity forming the receiving cavity 101. In other words, one end of the second pipe fitting 34 abuts against the liquid dispersant 32, and the other end of the second pipe fitting 34 abuts against the bottom of the receiving cavity 101 through the filter element 60. The upper end of the liquid dispersant 32 abuts against the bottom wall of the end cap 20, and the lower end of the liquid dispersant 32 abuts against the second pipe fitting 34. In this way, the second pipe fitting 34, the filter element 60, and the end cap 20 cooperate to axially limit the liquid dispersant 32, and the limiting effect is good, making it difficult for the liquid dispersant 32 to slide up and down axially. Understandably, if the liquid dispersant 32 could slide axially, the distance between the liquid dispersant 32 and the inlet 22 would change constantly, which would affect the performance of gas-liquid separation and result in poor stability.

[0031] Combination Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the liquid dispersing component 32 includes a plate portion 321 and a cover portion 322. Along the axial direction of the gas-liquid separator 100, the cover portion 322 extends from the outer periphery of the plate portion 321 toward the direction away from the end cap 20. The second pipe 34 abuts against the side of the plate portion 321 away from the end cap 20, and one end of the assembly portion 312 abuts against the end cap 20. Specifically, the second pipe 34 abuts against the side of the plate portion 321 away from the end cap 20, and one end of the assembly portion 312 abuts against the end cap 20. In this way, the second pipe 34 and the end cap 20 cooperate with each other to achieve axial restriction of the liquid dispersing component 32.

[0032] Combination Figure 3 and Figure 5 As shown, the liquid distribution component 32 further includes a conical structure 323, which protrudes from the plate portion 321 toward the inlet 22. It should be noted that when the gas-liquid two-phase refrigerant is discharged from the inlet 22, it can improve the gas-liquid separation effect of the gas-liquid two-phase refrigerant when it impacts the conical structure 323.

[0033] Combination Figure 3 and Figure 5As shown, the conical structure 323 is further arranged opposite to the inlet 22. Here, "opposite" means that along the axial direction of the gas-liquid separator 100, the top of the conical structure 323 is offset from the center of the inlet 22, so that the gas-liquid two-phase refrigerant output from the inlet 22 will flow through the plate 321 after being impacted by the conical structure 323, which can improve the gas-liquid separation effect.

[0034] There is a gap (not shown in the figure) between the first pipe 31 and the bottom of the cavity forming the return cavity 35. The return cavity 35 includes a first cavity 351 and a second cavity 352. The suction port 341 is located on the side wall of the second pipe 34. The first cavity 351 is connected to the receiving cavity 101 through the suction port 341. The second cavity 352 connects the first cavity 351 and the flow cavity 311. Along the radial direction of the second pipe 34, the flow area of ​​the first cavity 351 is larger than the flow area of ​​the second cavity 352. It should be noted that there is a gap between the first fitting 31 and the return cavity 35. When the gas-liquid two-phase refrigerant is output from the inlet 22, after the gas-liquid two-phase refrigerant impacts the dispersant 32, the liquid refrigerant flows from the inner wall of the body 10 to the bottom of the receiving cavity 101, while the gaseous refrigerant is located in the upper part of the receiving cavity 101. The gaseous refrigerant can enter from the suction port 341, and this part of the gaseous refrigerant will be output from the gap to the return cavity 35, and finally output from the outlet 23. It should be explained that since the flow area of ​​the first cavity 351 is larger than that of the second cavity 352, the gaseous refrigerant flows from the larger flow area of ​​the first cavity 351 to the smaller flow area of ​​the second cavity 352. In this way, the first cavity 351 can more smoothly guide the gaseous refrigerant located in the receiving cavity 101 from the suction port 341 to the second cavity 352, resulting in a better guiding effect.

[0035] The reflux chamber 35 also includes a third chamber 353. Along the axial direction of the gas-liquid separator 100, the first chamber 351 is located at the upper end of the reflux chamber 35, the second chamber 352 is located in the middle part of the reflux chamber 35, and the third chamber 353 is located at the lower end of the reflux chamber 35. The third chamber 353 connects the flow chamber 311 and the second chamber 352. Along the radial direction of the second pipe 34, the flow area of ​​the second chamber 352 is greater than the flow area of ​​the third chamber 353. It should be noted that when the gaseous refrigerant enters through the suction port 341, it passes through the first chamber 351, the second chamber 352, and the third chamber 353 in sequence. Since the flow area of ​​the first chamber 351 is larger than that of the second chamber 352, the gaseous refrigerant flows from the larger flow area of ​​the first chamber 351 to the smaller flow area of ​​the second chamber 352. In this way, the first chamber 351 can more smoothly guide the suction port 341 to the second chamber 352. Since the oil return hole 38 is located at the bottom of the second pipe fitting 34, and the flow area of ​​the third chamber 353 is smaller than that of the second chamber 352, the flow rate of the gaseous refrigerant in the third chamber 353 increases due to the reduced flow cross-sectional area of ​​the flow area. This allows the refrigeration oil mixed with some liquid refrigerant to be drawn into the flow chamber 311 more smoothly from the oil return hole 38, resulting in a better oil return effect.

[0036] Combination Figure 3 , Figure 5 , Figure 8 and Figure 9 As shown, the gas-liquid separation device 100 further includes a first support 36 and a second support 37. Along the radial direction of the second pipe 34, the first support 36 extends from the outer periphery of the second pipe 34 toward the side wall forming the receiving cavity 101. The radially outer side of the first support 36 abuts or is clearance-fitted with the side wall forming the receiving cavity 101. The second support 37 extends from the outer periphery of the second pipe 34 toward the side wall forming the receiving cavity 101. The radially outer side of the second support 37 abuts or is clearance-fitted with the side wall forming the receiving cavity 101. Along the axial direction of the gas-liquid separation device 100, the first support 36 and the second support 37 are arranged at intervals. The first support 36 is disposed near the liquid dispersing member 32, and the second support 37 is disposed near the bottom of the receiving cavity 101. The gas-liquid separation device 100 includes a drying member 70, which is located between the first support 36 and the second support 37. Both the first support 36 and the second support 37 have through holes 363. It should be noted that the drying element 70 is located between the first support 36 and the second support 37. The first support 36 and the second support 37 cooperate with each other to achieve axial restriction of the drying element 70, and the restriction effect is good.

[0037] More specifically, the first support 36 includes at least two first support members 361 and at least two first annular members 362. The at least two first support members 361 are arranged circumferentially spaced along the second tube 34, and the at least two first annular members 362 are arranged radially spaced along the second tube 34. The wall forming the through hole 363 includes a portion of the wall of the first annular member 362 and a portion of the wall of the first support member 361.

[0038] The second support 37 includes at least two second support members 371 and at least two second annular members 372. The at least two second support members 371 are arranged circumferentially along the second tube 34, and the at least two second annular members 372 are arranged radially along the second tube 34. The wall forming the through hole 363 includes a portion of the wall of the second annular member 372 and a portion of the wall of the second support member 371.

[0039] It should be noted that the first support member 361 and the first annular member 362 are arranged in a cross pattern, as are the second support member 371 and the second annular member 372. Compared to the traditional baffle opening, this embodiment can save material costs while providing a certain degree of restriction on the drying member 70. Furthermore, the cross arrangement of the first support member 361 and the first annular member 362, and the cross arrangement of the second support member 371 and the second annular member 372, results in through holes 363 of varying sizes, allowing the liquid refrigerant to flow more smoothly to the bottom of the receiving cavity 101.

[0040] Along the radial direction of the first pipe fitting 31, the radial dimension of the assembly part 312 is greater than the radial dimension of the pipe part 314, and the guide part 313 is provided with a reduced diameter from the assembly part 312 toward the pipe part 314. It should be noted that the assembly part 312 surrounds the outer periphery of the extension part 21 and is limited and fitted to the extension part 21. The pipe part 314 is located at one end of the guide part 313 near the bottom of the receiving cavity 101. The assembly part 312 is located at one end of the guide part 313 near the end cap 20. The guide part 313 is tapered from the assembly part 312 toward the pipe part 314. The guide part 313 has a trumpet-shaped structure. The radial dimension of the end of the guide part 313 near the assembly part 312 is larger than the radial dimension of the end of the guide part 313 near the pipe part 314. In this way, the guide part 313 can guide the gaseous refrigerant mixed with some refrigeration oil that is input from the pipe part 314 to the inner cavity of the extension part 21. The guide part 313 can effectively reduce the flow resistance of the refrigerant, which can reduce the pressure on the compressor in the external system. If the flow resistance is high, a compressor with higher power is required to drive it.

[0041] In some embodiments, along the axial direction of the gas-liquid separation device 100, the drying element 70 is located between the first support 36 and the second support 37, with one end of the drying element 70 abutting against the first support 36 and the other end of the drying element 70 abutting against the second support 37. In this way, the first support 36 and the second support 37 can axially restrict the drying element 70, resulting in a good restriction effect.

[0042] In addition, both the first support 36 and the second support 37 have at least two through holes 363, which connect to the receiving cavity 101. In this way, after the gas-liquid two-phase refrigerant is output from the inlet 22 and impacts the liquid distribution component 32, the liquid refrigerant can flow through the through holes 363 to the bottom of the receiving cavity 101.

[0043] Combination Figure 3 and Figure 4 As shown, the first pipe fitting 31 includes a limiting protrusion 33 located on the inner wall forming the flow cavity 311, and the extension 21 has a limiting groove 211; or, the first pipe fitting 31 has a limiting groove 211, and the extension 21 includes a limiting protrusion 33 located on the outer wall of the extension 21, with at least a portion of the limiting protrusion 33 located in the limiting groove 211. It should be noted that in this embodiment, the limiting protrusion 33 is circumferentially disposed on the inner wall forming the flow cavity 311, and the extension 21 has a limiting groove 211 that mates with the limiting protrusion 33. The limiting protrusion 33 and the limiting groove 211 engage in a limiting fit, thereby restricting the first pipe fitting 31 to the extension 21.

[0044] In some embodiments, the first pipe 31 has a limiting groove 211, and the extension 21 includes a limiting protrusion 33 located on the outer wall of the extension 21, with at least a portion of the limiting protrusion 33 located in the limiting groove 211. It should be noted that in this embodiment, the limiting protrusion 33 is circumferentially disposed on the outer wall of the extension 21, and the pipe portion 314 has a limiting groove 211 that engages with the limiting protrusion 33. The limiting protrusion 33 and the limiting groove 211 engage in a limiting fit, thereby restricting the first pipe 31 to the extension 21.

[0045] The end cap 20 has an inlet 22, an outlet 23, and an assembly cavity 24. The gas-liquid separation device 100 includes a one-way valve 50. The assembly cavity 24 connects the outlet 23 and the flow cavity 311. At least a portion of the one-way valve 50 is located in the assembly cavity 24, and the one-way valve 50 is limitedly connected to the inner wall forming the assembly cavity 24. Specifically, the gas-liquid separation device 100 also includes a sealing ring (not shown in the figure). The sealing ring is fitted around the outer periphery of the one-way valve 50, with one end abutting against the peripheral wall of the one-way valve 50 and the other end abutting against the inner wall forming the assembly cavity 24. Specifically, the sealing ring can provide a certain sealing effect, reducing refrigerant leakage into the gap between the one-way valve 50 and the wall forming the assembly cavity 24.

[0046] It should be noted that by placing the one-way valve 50 within the assembly cavity 24 of the extension 21, the gaseous refrigerant located in the receiving cavity 101 can only flow through the return cavity 35 to the flow cavity 311, and then exit from the outlet 23 through the one-way valve 50. Understandably, the one-way valve 50 reduces refrigerant leakage from other piping structures in the refrigeration system from the outlet 23 into the flow cavity 311.

[0047] The gas-liquid separator 100 includes a retaining spring 40, and an assembly cavity 24 has a retaining groove 241. The wall forming the assembly cavity 24 includes a stepped wall 242. At least a portion of the retaining spring 40 is located within the retaining groove 241. Along the axial direction of the gas-liquid separator 100, a portion of the one-way valve 50 abuts against the stepped wall 242, and a portion of the one-way valve 50 abuts against the retaining spring 40. It should be noted that at least a portion of the retaining spring 40 is located within the retaining groove 241. Along the axial direction of the gas-liquid separator 100, a portion of the one-way valve 50 abuts against the stepped wall 242, and a portion of the one-way valve 50 abuts against the retaining spring 40. In other words, at least a portion of the one-way valve 50 is located between the stepped wall 242 and the retaining spring 40. Thus, the stepped wall 242 and the retaining spring 40 cooperate with each other to axially restrict the one-way valve 50, resulting in a good restrictive effect.

[0048] It should be noted that the above descriptions of specific examples illustrate the principles and implementation methods of this application. These examples are merely for the purpose of helping to understand the method and core ideas of this application. It should be pointed out that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A gas-liquid separation device, characterized in that, It includes a first pipe fitting (31), a second pipe fitting (34), and a filter screen (39). The first pipe fitting (31) has a flow cavity (311). The second pipe fitting (34) is located on the outer periphery of the first pipe fitting (31). A return cavity (35) is provided between the second pipe fitting (34) and the first pipe fitting (31). The return cavity (35) is connected to the flow cavity (311). The gas-liquid separation device (100) has a receiving cavity (101), the second pipe (34) has an intake port (341), the filter screen (39) is fixedly connected or limitedly connected to the second pipe (34), at least part of the filter screen (39) is located in the intake port (341), and the mesh of the filter screen (39) communicates the receiving cavity (101) and the return cavity (35).

2. The gas-liquid separation device according to claim 1, characterized in that, The second pipe fitting (34) is injection molded with the filter screen (39) as an insert, and the filter screen (39) is injection molded and fixed to the second pipe fitting (34).

3. The gas-liquid separation device according to claim 1 or 2, characterized in that, The first pipe fitting (31) includes an assembly portion (312), at least a portion of the second pipe fitting (34) is interference-fitted with the outer wall of the assembly portion (312), and the first pipe fitting (31) has a balancing hole (342); Along the axial direction of the gas-liquid separator (100), the assembly part (312) is away from the bottom of the cavity forming the receiving cavity (101) relative to the equalization hole (342), and the equalization hole (342) connects the flow cavity (311) and the return cavity (35).

4. The gas-liquid separation device according to claim 3, characterized in that, The gas-liquid separation device (100) includes a head (20), the head (20) including an extension (21) along the axial direction of the gas-liquid separation device (100), the extension (21) extending toward the bottom wall forming the receiving cavity (101); The first pipe fitting (31) includes a flow guide (313) and a pipe (314). The assembly part (312) surrounds the outer periphery of the extension (21). The assembly part (312) is in a limiting fit with the extension (21). Along the axial direction of the gas-liquid separator (100), the assembly part (312) is closer to the end cap (20) relative to the flow guide (313). The pipe (314) is closer to the bottom of the cavity forming the receiving cavity (101) relative to the flow guide (313). The equalization hole (342) is located in the flow guide (313).

5. The gas-liquid separation device according to claim 4, characterized in that, The gas-liquid separation device (100) includes a liquid dispersing component (32) and a filter component (60). The liquid dispersing component (32) is integral with the first pipe component (31). Along the axial direction of the gas-liquid separation device (100), a portion of the liquid dispersing component (32) abuts against the end cap (20), a portion of the liquid dispersing component (32) abuts against the second pipe component (34), one end of the second pipe component (34) abuts against the liquid dispersing component (32), and the other end of the second pipe component (34) is press-fitted with the filter component (60). The end of the filter component (60) away from the end cap (20) abuts against the bottom of the cavity forming the receiving cavity (101).

6. The gas-liquid separation device according to any one of claims 1, 2, 4 and 5, characterized in that, There is a gap between the first tube (31) and the bottom of the cavity forming the return cavity (35). The return cavity (35) includes a first cavity (351) and a second cavity (352). The suction port (341) is located on the side wall of the second tube (34). The first cavity (351) is connected to the receiving cavity (101) through the suction port (341). The second cavity (352) connects the first cavity (351) and the flow cavity (311). Along the radial direction of the second tube (34), the flow area of ​​the first cavity (351) is larger than the flow area of ​​the second cavity (352).

7. The gas-liquid separation device according to claim 6, characterized in that, The reflux chamber (35) further includes a third chamber (353), which connects the flow chamber (311) and the second chamber (352). Along the radial direction of the second pipe fitting (34), the flow area of ​​the second chamber (352) is greater than the flow area of ​​the third chamber (353).

8. The gas-liquid separation device according to any one of claims 1, 2, 4 and 5, characterized in that, The gas-liquid separation device (100) includes a first support (36) and a second support (37). Along the radial direction of the second pipe (34), the first support (36) extends from the outer periphery of the second pipe (34) toward the sidewall forming the receiving cavity (101), and the second support (37) extends from the outer periphery of the second pipe (34) toward the sidewall forming the receiving cavity (101). Along the axial direction of the gas-liquid separation device (100), the first support (36) and the second support (37) are arranged at intervals. The gas-liquid separation device (100) includes a drying element (70) located between the first support (36) and the second support (37). Both the first support (36) and the second support (37) have through holes (363).

9. The gas-liquid separation device according to claim 4, characterized in that, Along the radial direction of the first pipe fitting (31), the radial dimension of the assembly part (312) is greater than the radial dimension of the pipe part (314), and the guide part (313) is provided with a reduced diameter from the assembly part (312) toward the pipe part (314).

10. The gas-liquid separation device according to claim 4 or 5, characterized in that, The first pipe fitting (31) includes a limiting protrusion (33) located on the inner wall forming the flow cavity (311), and the extension (21) has a limiting groove (211); Alternatively, the first fitting (31) has a limiting groove (211), and the extension (21) includes a limiting protrusion (33) located on the outer wall of the extension (21), with at least a portion of the limiting protrusion (33) located in the limiting groove (211).

11. The gas-liquid separation device according to claim 10, characterized in that, The gas-liquid separation device (100) includes a limiting protrusion (33) located on the inner wall forming the flow cavity (311), and the extension (21) has a limiting groove (211), with at least a portion of the limiting protrusion (33) located in the limiting groove (211).

12. The gas-liquid separation device according to claim 4, characterized in that, The end cap (20) has an outlet (23) and an assembly cavity (24). The gas-liquid separation device (100) includes a one-way valve (50). The assembly cavity (24) connects the outlet (23) and the flow cavity (311). At least a portion of the one-way valve (50) is located in the assembly cavity (24). The one-way valve (50) is limitedly connected to the inner wall forming the assembly cavity (24).

13. The gas-liquid separation device according to claim 12, characterized in that, The gas-liquid separator (100) includes a retaining ring (40), the assembly cavity (24) has a retaining groove (241), the wall forming the assembly cavity (24) includes a stepped wall (242), at least a portion of the retaining ring (40) is located in the retaining groove (241), along the axial direction of the gas-liquid separator (100), a portion of the one-way valve (50) abuts against the stepped wall (242), and a portion of the one-way valve (50) abuts against the retaining ring (40).

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