Gas-liquid separator and gas-liquid separator assembly

Abstract

The utility model provides a gas-liquid separator which comprises a steel device body and a copper adapter, the copper adapter is formed through a stamping process, one end of the copper adapter is connected with the steel device body in a welded mode, and the other end of the copper adapter is connected with the steel device body in a welded mode. The other end part of the copper adapter is provided with a first interface part, a second interface part and a connecting part for connecting the first interface part and the second interface part; the connecting part comprises a first connecting part and a second connecting part which are oppositely arranged, and a gap is formed between the first connecting part and the second connecting part. Due to the arrangement, the gas-liquid separator can be conveniently connected with more than two connecting pipes, the requirement for reducing the arrangement space is facilitated, and the consumption of copper materials can be reduced.

Description

Technical Field

[0001] This application belongs to the field of refrigeration technology, and specifically relates to a gas-liquid separator and a gas-liquid separator assembly. Background Technology

[0002] Currently, the commonly used pipe fittings for gas-liquid separators in the refrigeration field are single-hole, single-diameter types. Each fitting can only connect to one pipe. When multiple pipes need to be connected, the usual solution is to add openings to the separator's shell. If the openings are too close together, excessive local stress or high fluid pressure in the separator can easily lead to shell rupture or leaks at the connections. If the openings are too far apart, the pipe connections become scattered, making pipe arrangement inconvenient and space-consuming. Therefore, it is necessary to improve the above technology to solve the encountered technical problems. Utility Model Content

[0003] Therefore, it is necessary to address the above problems by providing a gas-liquid separator, the specific solution of which is as follows:

[0004] A gas-liquid separator includes: a steel body and a copper adapter, the copper adapter being formed by a stamping process, one end of the copper adapter being welded to the steel body, and the other end of the copper adapter being provided with a first interface portion, a second interface portion, and a connecting portion connecting the first interface portion and the second interface portion; the connecting portion includes a first connecting portion and a second connecting portion disposed opposite to each other, with a gap between the first connecting portion and the second connecting portion.

[0005] The gas-liquid separator provided in this application, firstly, incorporates a copper adapter with a first interface and a second interface. This design not only facilitates the connection between the gas-liquid separator and the two connecting pipes but also reduces the required layout space. Secondly, the two interface sections are connected by a first connecting section and a second connecting section, with a gap between them. This reduces the wall thickness reduction rate of the two connecting sections and improves the connection strength. Finally, the copper adapter is formed by stamping a copper tube, which relatively reduces the material consumption of the copper adapter.

[0006] This application also provides a gas-liquid separator assembly, the specific solution of which is as follows:

[0007] A gas-liquid separator assembly includes a gas-liquid separator, an inlet pipe, and an outlet pipe. The gas-liquid separator includes a steel body and a copper adapter. One end of the copper adapter is welded to the steel body, and the other end of the copper adapter is provided with a first interface portion, a second interface portion, and a connecting portion connecting the first interface portion and the second interface portion. The connecting portion includes a first connecting portion and a second connecting portion disposed opposite to each other, with a gap between the first connecting portion and the second connecting portion. The inlet pipe includes a first copper connector that is welded to the first interface portion. The outlet pipe includes a third copper connector that is welded to the second interface portion. The inner diameter d1 of the inlet pipe is smaller than the inner diameter d2 of the outlet pipe.

[0008] This application provides a gas-liquid separator assembly in which the inner diameter d1 of the inlet pipe is smaller than the inner diameter d2 of the outlet pipe. The gas separated in the separation chamber is quickly drawn out through the outlet pipe with a larger diameter, which reduces the pressure in the separation chamber and can relatively improve the separation efficiency of the separator. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram of a gas-liquid separator;

[0010] Figure 2 This is a cross-sectional view of a gas-liquid separator;

[0011] Figure 3 A perspective view of the first embodiment of the copper adapter;

[0012] Figure 4 This is a projection diagram of the copper adapter.

[0013] Figure 5 A perspective view of the second embodiment of the copper adapter;

[0014] Figure 6 This is a projection view of the second embodiment of the copper adapter;

[0015] Figure 7 This is a three-dimensional view of the gas-liquid separator assembly;

[0016] Figure 8 This is a cross-sectional view of the gas-liquid separator assembly.

[0017] Figure 9 for Figure 8 A partial view;

[0018] 100. Gas-liquid separator; 1. Steel body; 2. Copper adapter; 21. First interface; 22. Second interface; 23. First connecting part; 24. Second connecting part; 211. First opening; 221. Second opening; 2111. First end; 2112. Second end; 2211. Third end; 2212. Fourth end; 10. Separation chamber; 11. Connecting end; 25. Third interface; 251. Undulated / convex 3. Inlet pipe; 4. Outlet pipe; 31. First inlet end; 32. First outlet end; 41. Second inlet end; 42. Second outlet end; 5. Electronic expansion valve; 6. Silencer; 30. First steel piping; 33. First copper connecting pipe; 34. Second copper connecting pipe; 52. First copper connector; 40. Second steel piping; 60. Connection end; 61. Second copper connector; 43. Third copper connecting pipe; 44. Fourth copper connecting pipe; 51. Connecting pipe; Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] Currently, the commonly used pipe fittings for gas-liquid separators in the refrigeration field are single-hole, single-diameter types. Each fitting can only connect to one pipe. When multiple pipes need to be connected, the usual solution is to add openings to the separator's shell. If the openings are too close together, excessive local stress or high fluid pressure in the separator can easily lead to shell rupture or leaks at the connections. If the openings are too far apart, the pipe connections become scattered, making pipe arrangement inconvenient and space-consuming. Therefore, it is necessary to improve the above technology to solve the encountered technical problems.

[0021] To solve the above problems, see Figure 1-6This application provides a gas-liquid separator 100, which is a container for gas-liquid separation by storing refrigerant to prevent excessive intake of liquid refrigerant into the compressor. The gas-liquid separator 100 includes a steel body 1 made of steel and a copper adapter 2 made of copper. The copper adapter 2 is manufactured by stamping a copper tube, making the process relatively simple and convenient. One end of the copper adapter 2 is welded to the steel body 1. The welding method can be brazing, and it can be pre-fixed before welding for ease of connection. The other end of the copper adapter 2 is provided with at least a first interface portion 21, a second interface portion 22, and a connecting portion connecting the first interface portion 21 and the second interface portion 22. This connecting portion is formed when the copper tube is stamped. The connecting portion includes a first connecting portion 23 and a second connecting portion 24 disposed opposite to each other, with a gap between the first connecting portion 23 and the second connecting portion 24. The gas-liquid separator 100 provided in this application firstly features a copper adapter 2 at the connecting end 11, with two interface portions at one end. This facilitates connection between the gas-liquid separator and the inlet pipe 3 and outlet pipe 4, while also reducing the required layout space. Secondly, the two interface portions are connected by a first connecting portion 23 and a second connecting portion 24, with a gap between them. This reduces the wall thickness reduction rate of the two connecting portions and improves the connection strength. Finally, the copper adapter is formed by stamping a copper tube, which relatively reduces the material consumption of the copper adapter 2.

[0022] Furthermore, in the current technology, the gas-liquid separator 100 is provided with a copper adapter at its end. This copper adapter is made by machining a copper rod to form two interface sections for connecting the inlet and outlet pipes. Machining the copper rod into copper connectors not only consumes more copper, but also wastes copper material during the machining of the interface sections. In contrast, the copper adapter 2 in this application is made of copper material and is formed by stamping copper tubing. Copper material has good plasticity and ductility, and can be forged, cast, stretched, and rolled into various shapes and sizes. The copper tubing is stamped to form a first interface section 21, a second interface section 22, and a connecting section that connects the two interface sections. The connecting section includes a first connecting section 23 and a second connecting section 24 arranged opposite each other with a gap between them. Because copper material has good plasticity and ductility, after stamping, it can maintain its stamped state for a long time without increasing the gap due to material springback. In addition, setting a gap between the two connecting parts can further reduce problems such as cracks or breaks caused by the thinning of the wall thickness of the copper adapter 2 due to stamping. These problems will affect the product qualification rate and the connection strength at the connection point.

[0023] The gas-liquid separator 100 is generally installed on the inlet side of the compressor. Its main function is to separate the liquid and gas in the refrigerant, ensuring that the liquid enters the appropriate position in the refrigeration system to prevent liquid from entering the compressor, avoiding liquid slugging, and protecting the normal operation of the compressor. A copper adapter 2 is connected to the connecting end 11 of the gas-liquid separator 100. The inlet pipe 3 and outlet pipe 4 are connected to the steel body 1 through the copper adapter 2. To improve separation efficiency, the inner diameter d2 of the outlet pipe 4 is larger than the inner diameter d1 of the inlet pipe 3. This helps to quickly discharge the separated gas and improve the separation efficiency within the separation chamber. Because the inner diameter d2 of the outlet pipe 4 is larger than the inner diameter d1 of the inlet pipe 3, the inner diameters of the first interface 21 and the second interface 22 are not equal, i.e., their cross-sectional areas are different. Since the exhaust pipe 4 and the intake pipe 3 are made of the same material and have the same wall thickness, if the intake pipe 3 is welded to the first interface 21 and the exhaust pipe 4 is welded to the second interface 22, the cross-sectional area of ​​the first interface 21 is smaller than that of the second interface 22; if the intake pipe 3 is welded to the second interface 22 and the exhaust pipe 4 is welded to the first interface 21, the cross-sectional area of ​​the second interface 22 is smaller than that of the first interface 21.

[0024] On the one hand, refer to Figure 3-4 This application provides a copper adapter 2. The connecting portion of the copper adapter 2 is projected onto a plane perpendicular to the axis of the copper adapter 2. The projected shape of the connecting portion can be a V-shaped groove with a gradually widening groove width. The bottom wall of the V-shaped groove is an arc-shaped surface, which facilitates the connection of the first interface portion 21 and the second interface portion 22, making the transition of the connection smoother. It also helps to form an arc-shaped structure for the first interface portion 21 and the second interface portion 22, which facilitates the subsequent connection of the air inlet pipe 3 and the air outlet pipe 4. The first interface portion 21 and the second interface portion 22 are mainly used to connect the air inlet pipe 3 and the air outlet pipe 4 of the gas-liquid separator 100. The first interface portion 21 and the second interface portion 22 are arc-shaped structures with openings, which is more conducive to connecting and fixing the air inlet pipe 3 and the air outlet pipe 4. The first and second ends of the openings of the two interface portions are connected by the first connecting portion 23 and the second connecting portion 24, respectively. Specifically, the first interface portion 21 has an arc-shaped structure and includes a first opening 211, which includes a first end portion 2111 and a second end portion 2112; the second interface portion 22 has an arc-shaped structure and includes a second opening 221, which includes a third end portion 2211 and a fourth end portion 2212; the first end portion 2111 and the fourth end portion 2212 are connected by a first connecting portion 23, and the second end portion 2112 and the third end portion 2211 are connected by a second connecting portion 24.

[0025] Furthermore, there is a gap L between the first connecting part 23 and the second connecting part 24, satisfying that: L is greater than 0, and L is less than the smaller of D1 and D2. Although there is a gap between the first connecting part 23 and the second connecting part 24, the gap must be appropriate. If it is too large, it will not only be inconvenient to install, but also make it easy to fail to weld properly and cause leakage. If it is too small, the wall thickness of the copper adapter 2 will become too thin, resulting in cracks and other problems, thus affecting the connection strength. Therefore, it is preferable that: L is greater than or equal to half of the smaller of D1 and D2; and L is less than the smaller of D1 and D2. That is, if D1 < D2, then D1 / 2 ≤ L < D1; if D2 < D1, then D2 / 2 ≤ L < D2.

[0026] Furthermore, the center distance between the first interface 21 and the second interface 22 is defined as L1, where L1 is the distance from the center of the first interface 21 to the center of the second interface 22. It satisfies the following condition: L1≥(D1+D2) / 2. When L1=(D1+D2) / 2, when the air inlet pipe 3 and the air outlet pipe 4 are installed on the first interface 21 and the second interface 22 respectively, the outer wall of the air inlet pipe 3 and the outer wall of the air outlet pipe 4 fit tightly together. This arrangement can be pre-fixed before welding to facilitate subsequent welding operations. Of course, L1 cannot be too large. If it is too large, it will not only make the wall thickness of the connecting part of the copper adapter 2 thinner, affecting the connection strength, but also if the center distance is too large, too much solder will be required during welding, which will not only waste solder, but also easily lead to incomplete solder filling and leakage. In addition, the other end of the copper adapter 2 is provided with a third interface part 25. The steel body 1 includes a connecting end 11, and the third interface part 25 is welded to the connecting end 11. The air inlet pipe 3 of the gas-liquid separator 100 needs to penetrate into the interior of the steel body 1. If L1 is greater than the outer diameter of the third interface part 25, D3, the insertion of the air inlet pipe 3 will be restricted. Therefore, it is preferable that (D1+D2) / 2≤L1; and L1≤D3-(D1+D2) / 2.

[0027] Furthermore, the steel body 1 includes a connecting end 11, and the third interface portion 25 is welded to the connecting end 11. Specifically, to facilitate the insertion of the air inlet pipe 3 into the steel body 1, the third interface portion 25 is inserted into the connecting end 11. The outer wall of the third interface portion 25 is provided with a concave-convex portion 251, or the inner wall of the connecting end 11 is provided with a concave-convex portion 251. In this application, "concave-convex portion" refers to a structure with the shape of a protrusion, ridge, or groove formed by wire drawing or extrusion processes. The concave-convex portion 251 makes the hole wall of the third interface portion 25 and the connecting end 11 have a partially gapped and partially interference fit structure. The solder can fill the concave-convex portion 251 through capillary action, thereby improving the connection strength.

[0028] See Figures 5-6This application also provides another type of copper adapter 2. The connecting portion of the copper adapter 2 is projected onto a plane perpendicular to the axis of the copper adapter 2. The projected shape of the connecting portion can be a trapezoidal groove with a gradually widening groove width, and the bottom wall of the trapezoidal groove is flat. This arrangement can relatively reduce the opening size of the first opening 211 and the second opening 221, which helps to form a more regular arc-shaped structure for the first interface portion 21 and the second interface portion 22, making it more convenient to install and fix the air inlet pipe 3 and the air outlet pipe 4. Specifically, the bottom walls of the first connecting portion 23 and the second connecting portion 24 are arranged opposite to each other, and the groove width gradually increases in opposite directions. The line connecting the center A of the first interface portion 21 and the center B of the second interface portion 22 is defined as line AB. The first connecting portion 23 and the second connecting portion 24 both extend along the direction of line AB. The bottoms of the first connecting portion 23 and the second connecting portion 24 are both flat and parallel to each other. This design allows for a smaller gap between the first connecting part 23 and the second connecting part 24, which facilitates the flow of solder during welding, reduces the amount of solder used, and also relatively reduces the risk of leakage.

[0029] See Figures 7-9 This application also provides a gas-liquid separator assembly, including a gas-liquid separator 100, an inlet pipe 3, and an outlet pipe 4. The gas-liquid separator 100 includes a steel body 1 and a copper adapter 2. One end of the copper adapter 2 is welded to the steel body 1, and the other end of the copper adapter 2 is provided with a first interface portion 21, a second interface portion 22, and a connecting portion connecting the first interface portion 21 and the second interface portion 22. The connecting portion includes a first connecting portion 23 and a second connecting portion 24 disposed opposite to each other, with a gap between the first connecting portion 23 and the second connecting portion 24. The inlet pipe 3 includes a first copper connecting pipe 33, which is welded to the first interface portion 21. The outlet pipe 4 includes a third copper connecting pipe 43, which is welded to the second interface portion 22. The inner diameter d1 of the inlet pipe 3 is smaller than the inner diameter d2 of the outlet pipe 4. This design allows for rapid extraction of the separated gas from the separation chamber from the outlet pipe 4, while maintaining a constant compressor suction pressure. This helps reduce the pressure inside the steel body 1 and improves separation efficiency. Furthermore, by creating a gap between the first connecting part 23 and the second connecting part 24, solder flows into this gap during welding of the inlet pipe 3 and the outlet pipe 4. The solder within this gap not only provides a sealing effect but also further enhances the welding strength.

[0030] The gas-liquid separator 100 includes a separation chamber 10. The inlet pipe 3 includes a first inlet end 31 and a first outlet end 32. The first inlet end 31 is located outside the steel body 1, and the first outlet end 32 passes through the first interface portion 21 and is inserted into the separation chamber 10, located inside the steel body 1. The outlet pipe 4 includes a second inlet end 41 and a second outlet end 42. The second outlet end 42 is located outside the steel body 1, and the second inlet end 41 is welded to the second interface portion 22; alternatively, the second inlet end 41 passes through the second interface portion 22 and is inserted into the separation chamber 10. The first outlet end 32 is close to the bottom of the steel body 1 to reduce noise generated by liquid impact. Additionally, the first outlet end 32 should not be lower than the liquid level of the gas-liquid separator 100 to avoid "bubbling" and affecting the gas-liquid separation effect. The second inlet end 41 is closer to the connection end 11 than the first outlet end 32. The axial distance H between the first outlet end 32 and the second inlet end 41 in the axial direction of the gas-liquid separator 100 satisfies: H ≥ 50 mm. This section is used for gas storage. If the exhaust speed of the exhaust pipe 4 is slow or obstructed, this section can store the gas that cannot be discharged in time without affecting the separation efficiency of the gas-liquid two-phase mixed gas entering the separation chamber 10.

[0031] The gas-liquid separator 100 is made of steel, while the system piping is mostly made of copper. For easy connection to the system piping, the system piping is generally made of copper. A copper adapter 2 is installed at one end of the gas-liquid separator 100. One end of the copper system piping connects to the copper adapter 2, and the other end connects to the system piping. Of course, given the current rise in copper prices, to save costs, the system piping can also be made of steel piping with copper connectors at both ends.

[0032] Specifically, the refrigeration system will be equipped with various refrigeration components as needed. It may also require a filter to remove impurities from the refrigeration cycle and protect the lifespan of the components. Typically, the filter is located between the gas-liquid separator 100 and the compressor inlet. Additionally, a silencer can be installed in the system to eliminate or reduce noise generated by the working fluid flow. A filter screen can also be added inside the silencer to provide both noise reduction and filtration. Furthermore, an electronic expansion valve 5 is installed before the gas-liquid separator 100 for throttling.

[0033] The gas-liquid separator assembly includes an electronic expansion valve 5, which is located at the inlet end of the gas-liquid separator 100 and connected to the inlet pipe 3. The electronic expansion valve 5 includes a connecting pipe 51. The inlet pipe 3 includes a first steel pipe 30, with a first copper connecting pipe 33 and a second copper connecting pipe 34 connected to its two ends respectively. The first copper connecting pipe 33 is welded to the first interface portion 21. If the connecting pipe 51 is made of copper, the second copper connecting pipe 34 is welded to the connecting pipe 51 (not shown); or, see... Figure 7If the connector 51 is made of steel, a first copper connector 52 is provided at the free end of the connector 51, and the second copper connector 34 is welded to the first copper connector 52.

[0034] See Figure 7 The gas-liquid separator assembly includes a steel silencer 6, which is located at the inlet end of the compressor and connected to the outlet pipe 4 of the gas-liquid separator 100. A filter screen can also be installed inside the steel silencer 6 to act as a filter, meaning that filtration occurs simultaneously with silencing, preventing impurities from entering the compressor. The steel silencer 6 includes a connecting end 60 and a second copper connector 61 welded to the connecting end 60. The outlet pipe 4 includes a second steel pipe 40, with a third copper connector 43 and a fourth copper connector 44 connected to its two ends, respectively. The third copper connector 43 is welded to the second interface 22, and the fourth copper connector 44 is welded to the second copper connector 61. By using stainless steel as the main material for the piping and installing copper connectors at both ends, piping costs can be saved, thereby reducing the overall system cost.

[0035] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and intended to aid in understanding the method and core concepts of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A gas-liquid separator (100) characterized by, The application relates to a steel-copper adapter, which comprises a steel body (1) and a copper adapter (2) formed by a stamping process, one end of the copper adapter (2) is welded to the steel body (1), the other end of the copper adapter (2) is provided with a first interface part (21), a second interface part (22) and a connecting part connecting the first interface part (21) and the second interface part (22); the connecting part comprises oppositely arranged first and second connecting parts (23) and (24) with a spacing therebetween.

2. The gas-liquid separator of claim 1, wherein, The first interface part (21) comprises a first opening part (211) comprising a first end (2111) and a second end (2112); the second interface part (22) comprises a second opening part (221) comprising a third end (2211) and a fourth end (2212); the first end (2111) is connected to the fourth end (2212) through the first connecting part (23), and the second end (2112) is connected to the third end (2211) through the second connecting part (24).

3. The gas-liquid separator of claim 2, wherein, The cross-sectional areas of the first interface part (21) and the second interface part (22) are not equal.

4. The gas-liquid separator of claim 3, wherein, The first interface part (21) is in a circular arc structure, the second interface part (22) is in a circular arc structure; the inner diameter of the first interface part (21) is defined as D1, the inner diameter of the second interface part (22) is defined as D2, the spacing value L between the first connecting part (23) and the second connecting part (24) satisfies the condition that L is greater than or equal to half of the smaller value of D1 and D2, and L is smaller than the smaller value of D1 and D2.

5. The gas-liquid separator according to claim 3 or 4, characterized in that The copper adapter (2) has a third interface part (25) welded to the steel body (1), the outer diameter of the third interface part (25) is defined as D3, the center distance between the first interface part (21) and the second interface part (22) is defined as L1, and (D1+D2) / 2<=L1; and L1<=D3-(D1+D2) / 2.

6. The gas-liquid separator of claim 5, wherein, The steel body (1) comprises a connecting end (11), and the third interface part (25) is welded to the connecting end (11). The third interface part (25) is inserted into the connecting end (11), and the outer wall of the third interface part (25) is provided with a concave-convex part (251), or the inner wall of the connecting end (11) is provided with a concave-convex part (251).

7. A gas-liquid separator assembly characterized by, The gas-liquid separator (100) includes a steel body (1) and a copper adapter (2), one end of the copper adapter (2) is welded to the connecting end (11) of the steel body (1), and the other end of the copper adapter (2) is provided with a first interface part (21), a second interface part (22) and a connecting part connecting the first interface part (21) and the second interface part (22); the connecting part includes oppositely arranged first and second connecting parts (23) and (24), and the first and second connecting parts (23) and (24) have a spacing therebetween; the gas inlet pipe (3) includes a first copper connecting pipe (33) welded to the first interface part (21), and the gas outlet pipe (4) includes a third copper connecting pipe (43) welded to the second interface part (22); the inner diameter d1 of the gas inlet pipe (3) is smaller than the inner diameter d2 of the gas outlet pipe (4).

8. The gas-liquid separator assembly of claim 7, wherein, The gas-liquid separator (100) includes a separation cavity (10), the gas inlet pipe (3) includes a first inlet end (31) located outside the steel body (1) and a first outlet end (32) inserted into the separation cavity (10) through the first interface part (21) and located inside the steel body (1); the gas outlet pipe (4) includes a second inlet end (41) welded to the second interface part (22) and a second outlet end (42) located outside the steel body (1); or the second inlet end (41) is inserted into the separation cavity (10) through the second interface part (22); The second inlet end (41) is closer to the connecting end (11) than the first outlet end (32), and the axial distance H between the first outlet end (32) and the second inlet end (41) in the axial direction of the gas-liquid separator (100) satisfies H≥50mm.

9. The gas-liquid separator assembly of claim 7, wherein, The electronic expansion valve (5) includes a connecting pipe (51), the gas inlet pipe (3) includes a first steel pipe (30), and the first steel pipe (30) is provided with the first copper connecting pipe (33) and a second copper connecting pipe (34) at two ends thereof; The connecting pipe (51) is a copper connecting pipe, and the second copper connecting pipe (34) is welded to the connecting pipe (51); or the connecting pipe (51) is a steel connecting pipe, and a first copper connector (52) is arranged at a free end of the connecting pipe (51), and the second copper connecting pipe (34) is welded to the first copper connector (52).

10. The gas-liquid separator assembly of claim 8, wherein, The electronic expansion valve (5) includes a connecting pipe (51), the gas inlet pipe (3) includes a first steel pipe (30), and the first steel pipe (30) is provided with the first copper connecting pipe (33) and a second copper connecting pipe (34) at two ends thereof; The connecting pipe (51) is a copper connecting pipe, the second copper connecting pipe (34) is welded to the connecting pipe (51); or the connecting pipe (51) is a steel connecting pipe, a first copper connector (52) is arranged at a free end of the connecting pipe (51), and the second copper connecting pipe (34) is welded to the first copper connector (52).

11. The gas-liquid separator assembly of any of claims 7-10, wherein, The steel muffler (6) comprises a connecting end (60) and a second copper connector (61) welded to the connecting end (60), the air outlet pipe (4) comprises a second steel pipe (40), and the second steel pipe (40) is provided with the third copper connecting pipe (43) and the fourth copper connecting pipe (44) at two ends respectively, and the fourth copper connecting pipe (44) is welded to the second copper connector (61).

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