Pipeline connecting structure and gas collecting pipe assembly

Abstract

The utility model provides a pipeline connecting structure which is used for a refrigerating system, the pipeline connecting structure comprises a first pipe fitting, a second pipe fitting and an adapter, and a through hole penetrating through the side wall part is formed in the side wall part of the first pipe fitting; the second pipe fitting comprises a connecting section, the adapter comprises a first joint part and a second joint part, a part of the outer wall part of the connecting section is in welded connection with the first joint part, and the matched welding position of the connecting section and the first joint part is filled with welding flux; the second joint part is connected with at least part of the side wall part of the periphery of the through hole in a welding mode, and the matched welding position of the second joint part and the side wall part is filled with welding flux. A part of the outer wall part of the connecting section is connected with the inner wall part of the through hole in a welding manner, and a welding flux is filled at the matched welding part of the connecting section and the inner wall part; the connecting section comprises a first end part, and the first end part penetrates through the through hole and extends into the cavity of the first pipe fitting. In this way, the welding strength of the first pipe fitting and the second pipe fitting can be relatively improved, and machining convenience can be improved.

Description

Technical Field

[0001] This application pertains to refrigerant piping assemblies in air conditioning systems, and more specifically, relates to a piping connection structure and a gas collection pipe assembly. Background Technology

[0002] In the refrigerant piping of an air conditioning system, the refrigerant is in a state of high temperature and high pressure, which places high demands on the connection strength between the pipe components. The refrigerant piping is usually set with main pipes and branch pipes. The side wall of the main pipe is provided with flange holes to increase the welding area between the branch pipe and the main pipe, thereby improving the connection strength. When processing the flange holes of stainless steel main pipes, due to the properties of stainless steel, the probability of cracking is very high, resulting in high product processing difficulty and high defect rate. Utility Model Content

[0003] Therefore, it is necessary to provide a pipe connection structure that can improve the connection strength between pipe components and is easy to process, addressing the above problems. The specific technical solution is as follows:

[0004] The pipeline connection structure includes a first pipe fitting, a second pipe fitting, and an adapter. The first pipe fitting has a through hole penetrating the side wall. The second pipe fitting includes a connecting section. The adapter includes a first joint and a second joint. A portion of the outer wall of the connecting section is welded to the first joint, and the weld joint is filled with solder. The second joint is welded to at least a portion of the side wall of the through hole, and the weld joint is filled with solder. A portion of the outer wall of the connecting section is welded to the inner wall of the through hole, and the weld joint is filled with solder. The connecting section includes a first end, which extends through the through hole into the cavity of the first pipe fitting.

[0005] This application provides a pipeline connection structure. First, an adapter is used to connect the first and second pipe fittings together, and the structure of the adapter increases the welding strength between the first and second pipe fittings. Second, compared with the current technology of machining a flanged hole on the first pipe fitting, the adapter can be machined separately, which can reduce problems such as cracking of the first pipe fitting due to flanges, and further reduce the product processing difficulty and product defect rate. Finally, the inner wall of the connecting section and the through hole, the connecting section and the first joint, and the second joint and the outer side wall of the through hole are all welded together, and the weld joints are filled with solder. This arrangement not only realizes the connection between the components, but also strengthens the sealing and reduces the risk of refrigerant leakage.

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

[0007] The gas collecting pipe assembly includes a first pipe and multiple adapter components. Each adapter component includes a second pipe and an adapter, which are welded together. The first pipe has multiple through holes on its sidewall, which penetrate the sidewall. The number of adapter components is the same as the number of through holes. The second pipe includes a connecting section. The adapter includes a first joint and a second joint. A portion of the outer wall of the connecting section is welded to the first joint, and the weld joint is filled with solder. The second joint is welded to at least a portion of the sidewall surrounding the through hole, and the weld joint is filled with solder. A portion of the outer wall of the connecting section is welded to the inner wall of the through hole, and the weld joint is filled with solder. A first end of the connecting section extends through the through hole into the cavity of the first pipe.

[0008] The gas collecting pipe assembly provided in this application firstly connects the first and second pipe components together using an adapter, the structure of which increases the connection strength between the first and second pipe components. Secondly, the gas collecting pipe assembly includes multiple through holes. If multiple through holes are machined on the first pipe component using existing technology, the risk of wall breakage of the first pipe component is greater. The adapter can be machined separately, which can reduce problems such as breakage of the first pipe component due to multiple flanging, and further reduce the product processing difficulty and product defect rate. Finally, the inner wall of the connecting section and the through hole, the connecting section and the first joint, and the second joint and the outer periphery of the through hole are all connected by welding, and the weld joints are filled with solder. This setting not only realizes the connection between the components, but also strengthens the sealing, reduces the risk of refrigerant leakage, and improves the service life of the gas collecting pipe assembly. Attached Figure Description

[0009] Figure 1 A three-dimensional view of a gas collection pipe assembly;

[0010] Figure 2 A three-dimensional view of a gas collecting pipe sub-assembly;

[0011] Figure 3 It is a type of pipeline connection structure ( Figure 2 A three-dimensional diagram of the local structure;

[0012] Figure 4 A projection diagram of a pipeline connection structure;

[0013] Figure 5 A projection diagram of a pipeline connection structure;

[0014] Figure 6 A projection diagram of a pipeline connection structure;

[0015] Figure 7A projection diagram of another type of pipeline connection structure;

[0016] Figure 8 A projection view of a second pipe fitting according to one embodiment;

[0017] Figure 9 A projection view of the second pipe fitting according to another embodiment;

[0018] Figure 10 A 3D view of the adapter;

[0019] Figure 11 A projection diagram of the adapter;

[0020] Figure 12 A projection view of a branch pipe according to one embodiment;

[0021] 100. Gas collection pipe assembly; 200. Sub-assembly; 1. First pipe fitting; 2. Second pipe fitting; 20. Connecting section; 3. Adapter; 10. Side wall portion; 11. Through hole; 21. First connecting portion; 22. Second connecting portion; 23. First end; 30. First joint portion; 31. Second joint portion; 32. Step portion; 24. First outer wall portion; 4. Receiving cavity; 5. First welding ring; 25. Second end; 250. Boss portion; 301. End face; 6. Second welding ring; 8. Branch pipe; 80. Joint portion; 81. Piping; 26. Flared section; 27. Transition portion; 29. ​​Wire drawing portion; Detailed Implementation

[0022] 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.

[0023] In the refrigerant piping of an air conditioning system, the refrigerant is in a state of high temperature and high pressure, which places high demands on the connection strength between the pipe components. The refrigerant piping is usually set with main pipes and branch pipes. The side wall of the main pipe is provided with flange holes to increase the welding area between the branch pipe and the main pipe, thereby improving the connection strength. When processing the flange holes of stainless steel main pipes, due to the properties of stainless steel, the probability of cracking is very high, resulting in high product processing difficulty and high defect rate.

[0024] To solve the above technical problems, please refer to Figures 3-11This application provides a pipe connection structure for a refrigeration system, which can improve the connection strength between two pipe components, namely, a main pipe and a branch pipe, and also makes the pipe component product easier to process. The pipe connection structure includes a first pipe component 1, a second pipe component 2, and an adapter 3. The side wall portion 10 of the first pipe component 1 is provided with a through hole 11 penetrating the side wall portion 10. The second pipe component 2 includes a connecting section 20. The adapter 3 includes a first joint portion 30 and a second joint portion 31. A portion of the outer wall portion of the connecting section 20 is welded to the first joint portion 30, and the mating weld is filled with solder. The second joint portion 31 is welded to at least a portion of the side wall portion 10 around the through hole 11, and the mating weld is filled with solder. A portion of the outer wall portion of the connecting section 20 is welded to the inner wall portion of the through hole 11, and the mating weld is filled with solder. The connecting section 20 includes a first end portion 23, which extends through the through hole 11 into the cavity of the first pipe component 1. The welding connection method mentioned above can be brazing, such as tunnel furnace brazing. During tunnel furnace brazing, the solder melts at high temperature and penetrates and fills the mating joints of various components under the action of capillary action, forming a weld, which serves both as a connection and a sealing function. First, by using an adapter 3 to connect the first pipe fitting 1 and the second pipe fitting 2 together, the structure of the adapter 3 increases the welding strength between the first pipe fitting 1 and the second pipe fitting 2. Then, the gas collecting pipe assembly 100 includes multiple through holes 11. If multiple through holes 11 are machined on the first pipe fitting 1 using existing technology, the risk of wall breakage of the first pipe fitting 1 will be greater. The adapter 3 can be machined separately, which can reduce the problem of breakage of the first pipe fitting 1 due to multiple flanging, and further reduce the product processing difficulty and product defect rate. Finally, the inner wall of the connecting section 20 and the through hole 11, the connecting section 20 and the first joint 30, and the second joint 31 and the outer periphery of the through hole 11 are all connected by welding, and the welding joints are filled with solder. This setting not only realizes the connection between the components, but also strengthens the sealing and reduces the risk of refrigerant leakage.

[0025] Furthermore, the adapter 3 sealably connects the first pipe 1 and the second pipe 2. Here, "sealed connection" means that the first pipe 1 and the second pipe 2 are connected through the adapter 3, and when the refrigerant flows between the first pipe 1 and the second pipe 2, there will be no leakage at the mating connection between the adapter 3 and the first pipe 1 and the second pipe 2.

[0026] The portion where the connecting section 20 is welded to the inner wall of the through hole 11 is defined as the second connecting portion 22. The second connecting portion 22 is closer to the first end 23 than the first connecting portion 21. The second connecting portion 22 is tightly fitted to the inner wall of the through hole 11, which serves to pre-fix the connection and reduce the use of tooling fixtures. Furthermore, the second connecting portion 22 is brazed to the inner wall of the through hole 11, and the weld joint is filled with solder to form a first weld, which strengthens the sealing effect and reduces the risk of refrigerant leakage from this weld joint. The second joint 31 is welded to at least a portion of the side wall 10 on the outer periphery of the through hole 11, and the weld joint is filled with solder to form a second weld, which further reduces the risk of refrigerant leakage from this weld joint. Furthermore, to increase the connection area between the second joint 31 and at least a portion of the sidewall portion 10 around the outer periphery of the through hole 11, and to further improve the connection strength and sealing performance, the second joint 31 extends along the extension direction of the sidewall portion 10 by a stepped portion 32, and the extension length L of the second joint 31 satisfies: L≥3mm. This arrangement satisfies the welding length between the two welded parts, which is beneficial to improving welding strength and quality. In addition, it also increases corrosion resistance and reduces the risk of leakage due to corrosion. Further, see [reference needed]. Figure 6 , Figures 10-11 Looking at the adapter 3 along the axis of the second pipe 2, the projected shape of the adapter 3 can be circular, square, square with rounded corners, elliptical, etc. (specific illustrations are not given), or other irregular shapes, as long as the shape of the second joint 31 of the adapter 3 is compatible with the shape of at least part of the side wall of the outer periphery of the through hole 11, and the length L1 of the second joint 31 extending from the step 32 is ≥3mm.

[0027] The part where the connecting section 20 and the first joint 30 are welded together is defined as the first connecting part 21. The first joint 30 is a straight pipe section that extends along a direction perpendicular to the axis of the first pipe fitting 1. The inner wall of the first joint 30 is brazed to the first connecting part 21. Solder filler is used to form a third weld between the inner wall of the first joint 30 and the outer wall of the first connecting part 21, which can reduce the risk of refrigerant leakage from this welded joint. Assuming there is no adapter 3, if the first pipe fitting 1 is inserted into the inner cavity of the second pipe fitting 2 and welded together, the weld area will be small due to the limited wall thickness of the pipe fittings, affecting the weld strength and making refrigerant leakage more likely. By adding the adapter 3, which seals the first pipe fitting 1 and the second pipe fitting 2, the weld strength between them is improved. Furthermore, the second and third welds further enhance the seal, further reducing the risk of refrigerant leakage from this welded joint.

[0028] The outer wall portion of the connecting segment 20 located between the first connecting portion 21 and the second connecting portion 22 is defined as the first outer wall portion 24. The adapter 3 includes a stepped portion 32 connecting the first joint portion 30 and the second joint portion 31. At least a portion of the inner wall portion of the stepped portion 32 and the first outer wall portion 24 form a receiving cavity 4. The opening of the receiving cavity 4 faces the side wall portion 10. The receiving cavity 4 is used to place the first welding ring 5. After the first welding ring 5 melts, at least a portion of the receiving cavity 4 is filled with solder. Furthermore, the inner diameter of the first welding ring 5 is larger than the outer diameter of the connecting segment 20. The first welding ring 5 is placed in the receiving cavity 4 such that the inner surface of the first welding ring 5 and the outer wall surface of the connecting segment 20 have a radial distance. With this configuration, after the first welding ring 5 melts under high temperature, the gap between the inner wall portion of the connecting segment 20 that is guided to the through hole 11 and the first connecting portion 21 is reduced. More solder flows to the gap between the second joint portion 31 and a portion of the side wall portion around the outer periphery of the through hole 11, which is beneficial to improving welding strength and sealing performance. Furthermore, the inner wall of the receiving cavity 4 includes a vertical inner wall. The outer wall of the first welding ring 5 is preferably set against the vertical inner wall of the receiving cavity 4, so that the molten solder can more easily penetrate into the fitting gap between the second joint 31 and the outer peripheral wall of the through hole 11. Furthermore, when placing the first welding ring 5 in the receiving cavity 4, it should be able to press the first welding ring 5 into the receiving cavity 4 and not protrude from the opening of the receiving cavity 4. At this time, the depth H of the receiving cavity 4 must meet the diameter requirement of the first welding ring 5. Along the axial direction of the adapter 3, the minimum depth H of the receiving cavity 4 should be greater than the diameter of the first welding ring 5; preferably, H > 1 mm.

[0029] Furthermore, the first pipe fitting 1, the second pipe fitting 2, and the adapter 3 are connected by brazing. The brazing connection can be done in a tunnel furnace. For ease of connection, the first pipe fitting 1 and the adapter 3 are made of the same material, both including steel, preferably stainless steel; while at least a portion of the second pipe fitting 2 is made of copper, and the connection between the second pipe fitting 2 and the adapter 3 includes copper.

[0030] Specifically, the first pipe fitting 1, the second pipe fitting 2, and the adapter 3 are connected by brazing in a tunnel furnace. Due to the large number of components, it is not enough to only set the first welding ring 5 in the receiving cavity 4. In addition, a second welding ring 6 is provided on the end face 301 of the first joint 30 of the adapter 3. During the manufacturing process of the pipe connection structure, the second welding ring 6 is first sleeved on the second pipe fitting 2, and then the connecting section 20 of the second pipe fitting 2 is pressed into the adapter 3. During the pressing process, the first connecting part 21 and the first joint 30 are tightly fitted, and the second welding ring 6 is stuck against the end face 301 of the first joint 30 due to the obstruction of the first joint 30. During subsequent tunnel furnace welding, the second welding ring 6 melts under the high temperature of the tunnel furnace. Under the action of capillary action, part of the molten solder penetrates into the fitting gap between the first joint 30 and the first connecting part 21, and part of the molten solder penetrates along the surface of the connecting section 20 into the fitting gap between the second connecting part 22 and the inner wall of the through hole 11. After the molten solder cools, it forms a weld, which realizes the connection and plays a sealing role. To better guide the flow of solder, at least a portion of the outer wall of the connecting section 20 is provided with a wire drawing section 29. The wire drawing section 29 is made by a wire drawing process. The wire drawing tool moves along the axial direction of the second pipe 2 on the outer wall surface of the second pipe 2 to obtain the wire drawing section 29 extending along the axial direction of the second pipe 2, and is evenly distributed in the circumference of the connecting section 20. The wire drawing section can also be replaced by grooves, protrusions, or embossing. The wire drawing section 29 can achieve a tight fit when the second pipe 2 is engaged with the adapter 3 and the first pipe 1, and also provide a fitting gap at the fitting parts. The second welding ring 6 melts into flowing solder, and the solder penetrates into the fitting gap through capillary action. After cooling, it forms a weld, which plays a role in connection and sealing.

[0031] The first welding ring 5 melts under the high temperature of the tunnel furnace. Part of the molten solder fills the partial receiving cavity 4, and part of it penetrates into the fitting gap between the second joint 31 and at least part of the side wall 10 of the outer periphery of the through hole 11. After the molten solder cools, it forms a weld, thus realizing the connection and sealing between the second joint 31 and at least part of the side wall 10 of the outer periphery of the through hole 11. In summary, the connection method of this pipeline connection structure adopts tunnel furnace welding. First, the second welding ring 6 is fitted onto the second pipe fitting 2; then, the second pipe fitting 2 is pressed into the adapter 3 to a suitable position. The first joint 30 between the second pipe fitting 2 and the adapter 3 is tightly fitted, which can play a role in pre-fixation. The first welding ring 5 is placed in the receiving cavity 4 formed by the first outer wall 24 of the adapter 3 and the second pipe fitting 2. The inner diameter of the first welding ring 5 is larger than the outer diameter of the first outer wall 24. The combination of the second pipe fitting 2 and the adapter 3 is assembled with the first pipe fitting 1. The first end 23 of the second pipe fitting 2 is inserted into the cavity of the first pipe fitting 1 through the through hole 11. The second connecting part 22 of the second pipe fitting 2 is tightly fitted with the inner wall of the through hole 11, which can play a role in pre-fixation. Finally, the assembled component is placed in the tunnel furnace for welding. The first welding ring 5 and the second welding ring 6 melt under the action of high temperature and flow into the fitting gap of each component. After cooling, a weld is formed. The formation of the weld can not only connect the various components, but also play a role in sealing.

[0032] Furthermore, there is a fitting gap between the inner wall surface of the second joint 31 and the outer wall surface of at least a portion of the side wall portion 10 around the through hole 11. The two are connected by brazing, and the welding method can be tunnel furnace brazing. Solder fills the gap between the inner wall surface of the second joint 31 and the outer wall surface of the at least a portion of the side wall portion 10 around the through hole 11, and the solder forms a weld, which plays a role in connection, fixation and sealing. In addition, if the fitting gap between the two is too large, not only will a lot of solder be needed, but it is also easy to have poor welding and leakage problems. If the gap is too small, it will affect the flow of solder, and the solder will not fill in the gap, resulting in poor welding and leakage problems. Therefore, the inner wall surface of the second joint 31 is designed to match the shape of the outer wall surface of at least a portion of the side wall portion 10 around the through hole 11, and it is easier to set a suitable fitting gap between the two. The adapter 3 is an integrally formed structure. In order to facilitate welding with the stainless steel first pipe 1, the material of the adapter 3 is preferably stainless steel. As a material with high hardness and high toughness, stainless steel presents certain challenges in stamping. The sheet metal parts can be stamped by progressive stamping dies. Multiple stampings are performed by progressive stamping dies, which is more conducive to the forming of the adapter 3 and reduces subsequent deformation due to the springback force of the stainless steel material. This ensures that the shape of at least part of the side wall 10 of the second joint 31 and the outer periphery of the through hole 11 are compatible and that a suitable fitting clearance is maintained, which is beneficial to improving welding quality and service life.

[0033] Furthermore, the first joint 30 is a straight pipe section extending along an axis perpendicular to the first pipe fitting 1. The first joint 30 is tightly fitted to the inner wall of the second pipe fitting 2 and connected by brazing. Tunnel furnace brazing can be used for this connection. During manufacturing, the second pipe fitting 2 needs to be press-fitted into the adapter 3. The tight fit between the first joint 30 and part of the outer wall of the second pipe fitting 2 serves as a pre-fixing mechanism. Alternatively, tooling fixtures can be used for installation and positioning, but the tight fit eliminates the need for fixtures during subsequent welding, simplifying processing. The welding length L1 between the first joint 30 and the second pipe fitting 2 is defined as: L1 ≥ 3mm. This setting satisfies the welding length requirement between the two welded parts, improving welding strength and quality, and also increasing corrosion resistance, reducing the risk of leakage due to corrosion.

[0034] This application also provides a second pipe fitting 2, see reference. Figure 8 The second pipe fitting 2 includes a flared section 26. A transition section 27 is provided between the connecting section 20 and the flared section 26. The outer diameter of the transition section 27 gradually increases from the connecting section 20 to the flared section. An axial space is provided between the transition section 27 and the end face 301 of the first joint 30 for placing the second welding ring 6. After the second welding ring 6 melts, at least part of the axial space is filled with solder.

[0035] This application also provides another type of second pipe fitting 2, see [reference] Figure 9 The second pipe fitting 2 is provided with a boss portion 250, which is located at the end opposite to the first end 23, i.e., the second end 25. The second end 25 is located opposite to the first end 23. The boss portion 250 extends radially away from the axis of the adapter 3. Along the axis of the adapter 3, there is an axial space between the boss portion 250 and the end face 301 of the first joint portion 30 of the adapter 3 for placing the second welding ring 6. After the second welding ring 6 melts, part of the solder fills at least part of the axial space.

[0036] See Figures 1-2 , Figure 12 In the refrigerant piping of air conditioning systems, a manifold assembly 100 is commonly used to distribute the refrigerant flow. This manifold assembly 100 is mostly connected to the inlet and outlet ends of the condenser and evaporator. Traditional manifold assemblies 100 are entirely made of copper, resulting in high material costs. To reduce costs, current technology has introduced manifold assemblies where the first fitting 1 of the manifold assembly 100 is made of stainless steel, and then copper branch pipes 8 are welded onto the first fitting 1.

[0037] However, in actual production, the copper branch pipe 8 presents two problems: firstly, it has issues with the sealing of the welded connection with the first fitting 1; secondly, due to the large demand for the gas collecting pipe assembly 100, although the stainless steel first fitting 1 reduces costs for a certain length, the cost remains high because the branch pipe 8 is made of copper. Therefore, designing a low-cost stainless steel gas collecting pipe with good sealing performance has become an urgent problem to be solved.

[0038] The above-mentioned pipe connection structure is used in refrigeration systems and can be applied to gas collection pipe assemblies, four-way valve assemblies, etc. It is generally used in refrigerant pipes where the axes of the first pipe fitting 1 and the second pipe fitting 2 are perpendicular to each other. The following mainly introduces a gas collection pipe assembly 100 using the above-mentioned pipe connection structure. This application provides a gas collection pipe assembly 100. The connection between the first pipe fitting 1 and the second pipe fitting 2 in the gas collection pipe assembly 100 adopts the above-mentioned pipe connection structure. The gas collection pipe assembly 100 includes a first pipe fitting 1 and a plurality of adapter assemblies. The side wall portion 10 of the first pipe fitting 1 is provided with a plurality of through holes 11, which penetrate the side wall portion 10. The adapter assembly includes a second pipe fitting 2 and an adapter 3. The adapter 3 sealably connects the second pipe fitting 2 and the first pipe fitting 1. The number of through holes 11 and adapter assemblies is the same. The adapter 3 includes a first joint 30 and a second joint 31. A portion of the outer wall of the connecting section 20 is welded to the first joint 30, and the mating weld is filled with solder. The second joint 31 is welded to at least a portion of the side wall 10 on the outer periphery of the through hole 11, and the mating weld is filled with solder. A portion of the outer wall of the connecting section 20 is welded to the inner wall of the through hole 11, and the mating weld is filled with solder. The first end 23 of the connecting section 20 extends through the through hole 11 into the cavity of the first pipe 1. The gas collecting pipe assembly 100 provided in this application firstly connects the first pipe 1 and the second pipe 2 together by using an adapter 3. The structure of the adapter 3 increases the connection strength between the first pipe 1 and the second pipe 2. Secondly, the gas collecting pipe assembly 100 includes multiple through holes 11. If multiple through holes 11 are machined on the first pipe 1 using existing technology, the risk of breakage of the side wall portion 10 of the first pipe 1 is greater. The adapter 3 can be machined separately, which can reduce the breakage of the first pipe 1 due to multiple flanging, and further reduce the product processing difficulty and product defect rate. Finally, the inner wall portion of the connecting section 20 and the through hole 11, the connecting section 20 and the first joint portion 30, and the second joint portion 31 and the outer periphery of the through hole 11 are all connected by welding, and the weld joints are filled with solder. This arrangement not only realizes the connection between the components, but also strengthens the sealing, reduces the risk of refrigerant leakage, and improves the service life of the gas collecting pipe assembly 100.

[0039] The first fitting 1, the second fitting 2, and the adapter 3 are welded together in a tunnel furnace. The gas collecting pipe assembly 100 includes multiple branch pipes 8, the number of which is the same as the number of the second fitting 2. In this case, the second fitting 2 serves as a transition pipe, and at least some of the branch pipes 8 are made of the same material as the second fitting 2. Specifically, the second fitting 2 and the branch pipes 8 are made of the same material, copper. The branch pipes 8 are copper tubes. The second fitting 2 and the branch pipes 8 are welded one-to-one by flame brazing. If the copper branch pipes 8 are put into the tunnel furnace together with the adapter 3, the first fitting 1, and the second fitting 2, the copper branch pipes 8 will anneal to a soft state after welding, making them very prone to deformation and discoloration during production, handling, and transportation. In addition, the branch pipes 8 may be relatively long, making welding in the tunnel furnace inconvenient. For some customers, it is convenient to purchase only the gas collecting pipe sub-assemblies without the branch pipes 8 for easy transportation; for the gas collecting pipe assembly manufacturer, the sub-assemblies 200 of the gas collecting pipe assembly 100 (without the branch pipes 8) are more convenient for water testing. It can also solve the problem of reduced fatigue life of pipe fittings caused by coarse grains after brazing in copper tube furnaces. The second pipe fitting 2 and the branch pipe 8 are welded by flame brazing, which can solve the above-mentioned technical problems.

[0040] This application also provides another type of branch pipe 8, which includes a connector 80 and a pipe 81. The material of the connector 80 is the same as that of the second pipe fitting 2, both being copper. The material of the pipe 81 is stainless steel. The connector 80 and the pipe 81 are welded together, and the welding method can be tunnel furnace welding. The connector 80 and the second pipe fitting 2 are welded together by flame brazing. Here, the second pipe fitting 2 can be understood as a transition pipe. The use of stainless steel for the pipe 81 can further reduce the cost of the gas collecting pipe assembly 100.

[0041] 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 pipe connection structure for a refrigeration system, characterized by comprising: The pipeline connecting structure comprises a first pipe fitting (1), a second pipe fitting (2) and an adapter (3), a side wall part (10) of the first pipe fitting (1) is provided with a through hole (11) penetrating through the side wall part (10); the second pipe fitting (2) comprises a connecting section (20), the adapter (3) comprises a first joint part (30) and a second joint part (31), a part of an outer wall part of the connecting section (20) is welded to the first joint part (30), and the mating welding part of the two is filled with solder; the second joint part (31) is welded to at least part of the side wall part (10) of the periphery of the through hole (11), and the mating welding part of the two is filled with solder; a part of the outer wall part of the connecting section (20) is welded to the inner wall part of the through hole (11), and the mating welding part of the two is filled with solder; the connecting section (20) comprises a first end part (23), the first end part (23) extends into the cavity of the first pipe fitting (1) through the through hole (11).

2. The pipe connection structure according to claim 1, characterized by The part where the connecting section (20) is welded to the first joint part (30) is defined as a first connecting part (21), the first joint part (30) is a straight pipe section, the first joint part (30) extends along the direction perpendicular to the axis of the first pipe fitting (1), the first joint part (30) is brazed to the first connecting part (21), and the inner wall surface of the first joint part (30) and the outer wall surface of the first connecting part (21) are filled with solder.

3. The pipe connection structure according to claim 2, characterized by The part where the connecting section (20) is welded to the inner wall part of the through hole (11) is defined as a second connecting part (22), the outer wall part between the first connecting part (21) and the second connecting part (22) is a first outer wall part (24), the second connecting part (22) is closer to the first end part (23) relative to the first connecting part (21), the adapter (3) comprises a step part (32) connecting the first joint part (30) and the second joint part (31), at least part of the inner wall part of the step part (32) forms a containing cavity (4) for placing a first solder ring (5) with the first outer wall part (24), the opening of the containing cavity (4) faces the side wall part (10), and part of the containing cavity (4) is filled with solder.

4. The pipe connection structure according to claim 3, characterized by The second joint part (31) extends along the extension direction of the side wall part (10) from the step part (32), and the extension length L of the second joint part (31) satisfies: L≥3mm.

5. The pipe connection structure according to claim 3, characterized by Along the axis direction of the adapter (3), the minimum depth H of the containing cavity (4) satisfies: H>1mm.

6. The pipe connection structure according to claim 4, characterized by Along the axis direction of the adapter (3), the minimum depth H of the containing cavity (4) satisfies: H>1mm.

7. The pipe connection structure according to any one of claims 1 to 6, characterized by The inner wall surface of the second joint part (31) and the outer wall surface of at least part of the side wall part (10) of the periphery of the through hole (11) are matched in shape and brazed, and the inner wall surface of the second joint part (31) and the outer wall surface of at least part of the side wall part (10) of the periphery of the through hole (11) are filled with solder.

8. The pipe connection structure according to claim 7, characterized by The first pipe (1) and the adapter (3) are made of the same material, which is steel material, and the second pipe (2) is made of copper material; The second pipe (2) comprises a boss (250) arranged at a second end (25) of the second pipe (2) opposite to the first end (23), the boss (250) extending away from the axis of the adapter (3) along the radial direction of the adapter (3), and the boss (250) and the end face (301) of the first joint (30) have an axial space for placing a second solder ring (6) along the axis of the adapter (3), at least part of the axial space being filled with solder. Alternatively, the second pipe (2) comprises a flared section (26), and a transition section (27) is arranged between the connecting section (20) and the flared section (26), the outer diameter of the transition section (27) gradually increasing from the connecting section (20) to the flared section (26), and the transition section (27) and the end face (301) of the first joint (30) form an axial space for placing a second solder ring (6), at least part of the axial space being filled with solder.

9. A gas collector assembly characterized by, The manifold assembly (100) comprises a first pipe (1), a plurality of adapter assemblies, each adapter assembly comprising a second pipe (2) and an adapter (3), the second pipe (2) and the adapter (3) being welded together, the side wall (10) of the first pipe (1) is provided with a plurality of through holes (11) penetrating the side wall (10), and the number of the adapter assemblies is consistent with the number of the through holes (11); the second pipe (2) comprises a connecting section (20), the adapter (3) comprises a first joint (30) and a second joint (31), part of the outer wall of the connecting section (20) is welded to the first joint (30), and the welding joint is filled with solder; the second joint (31) is welded to at least part of the side wall (10) of the outer periphery of the through hole (11), and the welding joint is filled with solder; part of the outer wall of the connecting section (20) is welded to the inner wall of the through hole (11), and the welding joint is filled with solder; the first end (23) of the connecting section (20) extends into the cavity of the first pipe (1) through the through hole (11).

10. The gas collector assembly of claim 9, wherein, A plurality of branch pipes (8) are provided, and the plurality of branch pipes (8) are brazed to the plurality of second pipes (2) one by one.

11. The gas collector assembly of claim 10, wherein, The first pipe (1) and the adapter (3) are made of the same material, which is steel material, and the second pipe (2) is made of copper material; The first pipe (1) and the adapter (3) are made of the same material, which is steel material, and the second pipe (2) is made of copper material; Alternatively, the branch pipe (8) comprises a joint portion (80) and a pipe (81), the joint portion (80) and the pipe (81) are welded, the joint portion (80) is of the same material as the second pipe fitting (2) and comprises a copper material, the first pipe fitting (1), the pipe (81) and the adapter (3) are of the same material and comprise a steel material.

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