Processing method of gas collecting tube assembly and gas collecting tube assembly

Abstract

The invention provides a machining method of a gas collecting pipe assembly and the gas collecting pipe assembly. A connecting pipe, an adapter and a first welding ring are provided; the connecting pipe and the adapter are assembled to form an adapter assembly with a containing cavity; the first welding ring is placed in the containing cavity; a main pipe is provided, and a through hole penetrating through the side wall part is formed in the side wall part of the main pipe; the adapter assembly and the main pipe are assembled, the first end of the connecting pipe penetrates through the through hole and extends into a cavity of the main pipe, and part of the outer wall of the connecting pipe is in close fit with the inner wall of the through hole to form a sub-assembly; and the sub-assembly is subjected to tunnel furnace brazing. In this way, the welding quality of the main pipe and the connecting pipe can be relatively improved, and machining convenience can be improved.

Description

Technical Field

[0001] The present application relates to a method for processing a refrigerant pipe assembly of an air conditioning system, and more specifically, to a method for processing an air collecting pipe assembly and an air collecting pipe assembly. Background Art

[0002] In the refrigerant pipeline of the air-conditioning system, the refrigerant in the pipeline will be in a high temperature and high pressure state, and there are relatively high requirements for the connection strength between the pipeline parts. The refrigerant pipeline is usually equipped with a main pipe and a branch pipe. The side wall of the main pipe is provided with a flanging hole to increase the welding area between the branch pipe and the main pipe, thereby improving the connection strength. At present, the pipeline connection structure of the flanging structure has begun to be used in batches, but due to the material properties of the stainless steel main pipe, the probability of cracking during flanging is very high, resulting in difficulty in product processing and a high defect rate. Summary of the invention

[0003] Based on this, it is necessary to provide a processing method for a gas collecting pipe assembly to address the above problems. The specific technical solution is as follows:

[0004] Provide a connecting pipe, an adapter and a first welding ring; assemble the connecting pipe and the adapter to form an adapter assembly having an accommodating cavity; place the first welding ring in the accommodating cavity; provide a main pipe, the side wall of which is provided with a through hole penetrating the side wall; assemble the adapter assembly and the main pipe, extend the first end of the connecting pipe through the through hole into the cavity of the main pipe, and a part of the outer wall of the connecting pipe is tightly matched with the inner wall of the through hole to form a subassembly; and perform tunnel furnace brazing on the subassembly.

[0005] The present application provides a processing method for a gas collecting pipe assembly. First, a main pipe and a connecting pipe are connected together by using an adapter, and the adapter increases the welding strength between the main pipe and the connecting pipe; then, a plurality of through holes are provided on the main pipe. If a plurality of through holes are processed on the main pipe using the method of the prior art, the risk of the wall of the main pipe being broken is greater. The adapter can be processed separately, which can reduce the problems such as the breakage of the main pipe caused by multiple flanging, and further reduce the difficulty of product processing and the product defect rate; in addition, the first end of the connecting pipe passes through the through hole and extends into the cavity of the main pipe, and part of the outer wall of the connecting pipe is The adapter is tightly fitted with the inner wall of the through hole. The tight fit setting can be pre-positioned before brazing without the need for additional tooling and fixtures, further reducing the difficulty of product processing. Finally, the subassembly is welded in a tunnel furnace, so that the main pipe, the adapter and the connecting pipe can be welded at one time, reducing the number of welding steps. A first welding ring is placed in the accommodating cavity of the adapter assembly. During tunnel furnace brazing, the first welding ring will melt and penetrate into and fill in the various matching gaps of the subassembly, which not only achieves a connecting effect but also plays a sealing role to prevent refrigerant from leaking from the connection between the connecting pipe and the main pipe.

[0006] The present application also provides a gas collecting pipe assembly, the specific scheme is as follows:

[0007] A collecting pipe assembly, the collecting pipe assembly includes a main pipe and a plurality of adapter assemblies, the side wall portion of the main pipe is provided with a plurality of through holes; the through holes penetrate the side wall portion, the adapter assembly includes a connecting pipe and an adapter, the adapter sealingly joins the connecting pipe and the main pipe, the number of the connecting pipes, the adapter and the through holes is consistent; the connecting pipe includes a connecting section, the connecting section includes a first end portion, the first end portion passes through the through hole and extends into the cavity of the main pipe; the adapter includes a straight pipe section and a fixing portion, the fixing portion is connected to at least a portion of the side wall portion of the outer periphery of the through hole by brazing, a portion of the outer wall portion of the connecting section is tightly matched with the inner wall portion of the through hole, and the connecting section is connected to the straight pipe section by brazing.

[0008] The gas collecting pipe assembly provided by the present application firstly connects the main pipe and the connecting pipe together by using an adapter, and the structure of the adapter (fixed part and straight pipe section) increases the connection strength between the main pipe and the connecting pipe; then, the gas collecting pipe assembly is provided with a plurality of through holes. If a plurality of through holes are processed on the main pipe by the method of the prior art, the risk of the wall of the main pipe being broken is greater. The adapter can be processed separately, which can reduce the problems such as the breakage of the main pipe caused by multiple flanging, and further reduce the difficulty of product processing and the product defect rate; in addition, the first end portion of the connecting section extends into the cavity of the main pipe through the through hole, and the connecting section Part of the outer wall is tightly fitted with the inner wall of the through hole. The tight fit setting can be used for pre-positioning before brazing without the need for additional tooling and fixtures, which further reduces the difficulty of product processing. The setting of the straight pipe section can further ensure the coaxiality of the connecting pipe and the through hole. Finally, the fixed portion and at least part of the side wall of the outer periphery of the through hole are connected by brazing, and the connecting section and the straight pipe section are connected by brazing. During brazing, the welding joints are generally 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 increases the life of the gas collecting pipe assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a perspective view of a gas collecting pipe assembly;

[0010] Figure 2 is a perspective view of a gas collecting pipe subassembly;

[0011] Figure 3 A three-dimensional diagram of a partial structure of a gas collecting pipe assembly;

[0012] Figure 4 A projection diagram of a local structure of a gas collecting pipe assembly;

[0013] Figure 5A projection diagram of a local structure of a gas collecting pipe assembly;

[0014] Figure 6 A projection diagram of a local structure of a gas collecting pipe assembly;

[0015] Figure 7 A projection diagram of a partial structure of another gas collecting pipe assembly;

[0016] Figure 8 A projection diagram of a connecting pipe of an embodiment;

[0017] Fig. 9 A projection diagram of a connecting pipe of another embodiment;

[0018] Fig.10 is a three-dimensional diagram of the adapter;

[0019] Fig.11 is a projection diagram of the adapter;

[0020] Fig.12 A projection diagram of a branch pipe of an embodiment;

[0021] 100, gas collecting pipe assembly; 300, adapter assembly; 200, subassembly; 1, main pipe; 2, connecting pipe; 20, connecting section; 3, adapter; 10, side wall; 11, through hole; 21, first connecting section; 22, second connecting section; 23, first end; 30, straight pipe section; 31, fixing section; 32, step section; 24, first outer wall; 4, accommodating cavity; 5, first welding ring; 25, second end; 250, boss section; 301, end face; 6, second welding ring; 8, branch pipe; 80, joint section; 81, piping; 26, flaring section; 27, transition section; 29, wire drawing section; DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] In the refrigerant pipeline of the air-conditioning system, the refrigerant in the pipeline will be in a high temperature and high pressure state, and there are relatively high requirements for the connection strength between the pipeline parts. The refrigerant pipeline is usually equipped with a main pipe and a branch pipe. The side wall of the main pipe is provided with a flanging hole to increase the welding area between the branch pipe and the main pipe, thereby improving the connection strength. At present, the pipeline connection structure of the flanging structure has begun to be used in batches, but due to the material properties of the stainless steel main pipe, the probability of cracking during flanging is very high, resulting in difficulty in product processing and a high defect rate.

[0024] To solve the above technical problems, see Figure 1-Figure 12The present application provides a gas collecting pipe assembly, a gas collecting pipe assembly 100, the gas collecting pipe assembly 100 includes a main pipe 1, a plurality of adapter assemblies 300, the side wall portion 10 of the main pipe 1 is provided with a plurality of through holes 11; the through holes 11 penetrate the side wall portion, the adapter assembly 300 includes a connecting pipe 2 and an adapter 3, the adapter 3 sealingly joins the connecting pipe 2 and the main pipe 1, the number of the connecting pipe 2, the adapter 3 and the through holes 11 is consistent; the connecting pipe 2 includes a connecting section 20, the connecting section 20 includes a first end portion 23, the first end portion 23 passes through the through hole 11 and extends into the cavity of the main pipe 1; the adapter 3 includes a straight pipe section 30 and a fixing portion 31, the fixing portion 31 is connected to at least a portion of the side wall portion 10 of the outer periphery of the through hole 11 by brazing, a portion of the outer wall portion of the connecting section 20 is tightly matched with the inner wall portion of the through hole 11, and the connecting section 20 is connected to the straight pipe section 30 by brazing. In this arrangement, first, the main pipe 1 and the connecting pipe 2 are connected together by using the adapter 3, and the structure of the adapter 3 (fixing portion 31 and straight pipe section 30) increases the connection strength between the main pipe 1 and the connecting pipe 2; then, the gas collecting pipe assembly 100 is provided with a plurality of through holes 11. If a plurality of through holes 11 are processed on the main pipe 1 using the method of the prior art, the risk of the wall of the main pipe 1 being broken is greater. The adapter 3 can be processed separately, which can reduce the problem of the main pipe 1 being broken due to multiple flanging, and further reduce the difficulty of product processing and the product defect rate; in addition, the first end portion 23 of the connecting section 20 passes through the through hole 11 and extends into the cavity of the main pipe 1, and the connecting section Part of the outer wall of 20 is tightly fitted with the inner wall of the through hole 11. The tight fit setting can be pre-positioned before brazing without the need for additional tooling and fixtures, further reducing the difficulty of product processing; the setting of the straight pipe section 30 can further ensure the coaxiality of the connecting pipe 2 and the through hole 11; finally, the fixing portion 31 is connected to at least part of the side wall portion 10 of the outer periphery of the through hole 11 by brazing, and the connecting section 20 is connected to the straight pipe section 30 by brazing. During brazing, the welding joints are generally filled with solder. This setting not only realizes the connection between the components but also plays a role in strengthening the seal, reduces the risk of refrigerant leakage, and increases the life of the collecting pipe assembly.

[0025] Specifically, a portion of the outer wall of the connecting section 20 is brazed to the straight pipe section 30, and the matching welding place of the two is filled with solder; the fixing portion 31 is brazed to at least a portion of the side wall 10 of the outer periphery of the through hole 11, and the matching welding place of the two is filled with solder; a portion of the outer wall of the connecting section 20 is brazed to the inner wall of the through hole 11, and the matching welding place of the two is filled with solder; the connecting section 20 includes a first end 23, and the first end 23 passes through the through hole 11 and extends into the cavity of the main pipe 1. The above-mentioned welding connection method can be a brazing connection, such as tunnel furnace brazing. During tunnel furnace brazing, the solder is melted by high temperature and penetrates and fills the matching connection of each component under the action of the capillary to form a weld, which plays a role of connection while also strengthening the sealing, reducing the risk of refrigerant leakage.

[0026] Furthermore, the adapter 3 seals the main pipe 1 and the connecting pipe 2, where the seals are connected to each other through the adapter 3, and when the refrigerant flows between the main pipe 1 and the connecting pipe 2, it will not leak at the fitting connection between the adapter 3 and the main pipe 1 and the connecting pipe 2.

[0027] The part where the connecting section 20 is welded to the inner wall of the through hole 11 is defined as the second connecting part 22. The second connecting part 22 is closer to the first end 23 than the first connecting part 21. The second connecting part 22 is tightly matched with the inner wall of the through hole 11, and the tight match can play a role of pre-fixing; further, the second connecting part 22 is connected to the inner wall of the through hole 11 by brazing, and the welding connection is filled with solder to form a first weld, which plays a sealing role and can reduce the risk of refrigerant leakage from the matching weld. The fixing part 31 is welded to at least part of the side wall 10 of the outer periphery of the through hole 11, and the matching weld of the two is filled with solder to form a second weld, which plays a sealing role and can also reduce the risk of refrigerant leakage from the matching weld. Further, in order to increase the connection area between the fixing part 31 and at least part of the side wall 10 of the outer periphery of the through hole 11, and further improve the connection strength and sealing performance, the fixing part 31 is extended from the step part 32 along the extension direction of the side wall 10, and the extension length L of the fixing part 31 satisfies: L≥3mm. This setting satisfies the welding length between the two welded parts, which is beneficial to improve the welding strength and quality. In addition, the corrosion resistance is also increased, reducing the risk of leakage due to corrosion. Figure 6 , Figure 10-11 Looking at the adapter 3 along the axial direction of the connecting pipe 2, the projection shape of the adapter 3 can be circular, square, square with rounded corners, elliptical, etc. (specific figures are not shown), and of course, it can also be other irregular shapes, as long as the fixing portion 31 of the adapter 3 is compatible with the outer shape of at least part of the side wall of the outer periphery of the through hole 11, and the length L1 of the fixing portion 31 extending from the step portion 32 is ≥3mm.

[0028] The position where the connecting section 20 and the inner wall of the straight pipe section 30 are welded is defined as the first connecting section 21. The straight pipe section 30 extends in a direction perpendicular to the axis of the main pipe 1. The inner wall of the straight pipe section 30 is brazed to the first connecting section 21. The inner wall surface of the straight pipe section 30 and the outer wall surface of the first connecting section 21 are filled with solder to form a third weld, which plays a sealing role and can reduce the risk of refrigerant leakage from the matching weld. Assuming that there is no adapter 3, the main pipe 1 is inserted into the inner cavity of the connecting pipe 2 and welded. Due to the limited wall thickness of the pipe fitting, the welding area between the two is small, which affects the welding strength between the two and is prone to refrigerant leakage. At this time, by adding the adapter 3, the adapter 3 seals the main pipe 1 and the connecting pipe 2, which not only improves the welding strength between the main pipe 1 and the connecting pipe 2, but the second weld and the third weld mentioned above also play a role in strengthening the seal, which can further reduce the risk of refrigerant leakage from the matching weld.

[0029] The outer wall portion on the connecting section 20 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 step portion 32 connecting the straight pipe section 30 and the fixing portion 31. At least part of the inner wall portion of the step 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 is melted, at least part of the receiving cavity 4 is filled with solder. Further, the inner diameter of the first welding ring 5 is provided to be larger than the outer diameter of the connecting section 20. The first welding ring 5 is placed in the receiving cavity 4 so that the inner surface of the first welding ring 5 and the outer wall surface of the connecting section 20 have a radial spacing. The inner diameter of the first welding ring 5 here refers to the inner diameter when the installation is completed. In this way, after the first solder ring 5 melts under high temperature, the solder flowing to the matching gap between the inner wall of the through hole 11 and the first connecting part 21 guided by the connecting section 20 is reduced, and more solder flows to the matching gap between the fixing part 31 and the part of the side wall of the outer periphery of the through hole 11, which is beneficial to improve the welding strength and sealing performance. Further, the inner wall of the accommodating cavity 4 includes a vertical inner wall, and the outer wall of the first solder ring 5 is preferably arranged close to the vertical inner wall of the accommodating cavity 4, so that the melted solder can more easily penetrate and flow into the matching gap between the fixing part 31 and the part of the outer peripheral wall of the outer periphery of the through hole 11. Further, when the first solder ring 5 is placed in the accommodating cavity 4, the first solder ring 5 should be able to be pressed into the accommodating cavity 4 and should not protrude from the opening of the accommodating cavity 4. At this time, the depth H of the accommodating cavity 4 must meet the diameter requirement of the first solder ring 5. Along the axial direction of the adapter 3, the minimum depth H of the accommodating cavity 4 should be greater than the diameter of the first solder ring 5, preferably, H>1mm.

[0030] Furthermore, the main pipe 1, the connecting pipe 2 and the adapter 3 are connected by brazing, and the brazing connection can be tunnel furnace welding. To facilitate the connection, the main pipe 1 and the adapter 3 are made of the same material, both including steel material, preferably stainless steel; in order to achieve the connection between the adapter 3 and the copper branch pipe 8, the material of the connecting pipe 2 includes copper material.

[0031] Specifically, the main pipe 1, the connecting pipe 2 and the adapter 3 are connected by tunnel furnace brazing. The assembly after the pipe 1, the connecting pipe 2 and the adapter 3 are connected can be called a gas collecting pipe subassembly 200. Due to the large number of components, it may not be enough to only set the first welding ring 5 in the accommodating cavity 4, which will affect the welding quality. In order to further improve the welding quality and welding strength between the main pipe 1, the connecting pipe 2 and the adapter 3, a second welding ring 6 is set on the end face 301 of the straight pipe section 30 of the adapter 3. In the manufacturing process of the gas collecting pipe subassembly 200, the second welding ring 6 is first sleeved on the connecting pipe 2, and then the connecting section 20 of the connecting pipe 2 is pressed into the adapter 3. In the process of pressing, the first connecting part 21 is connected with the straight pipe section 30. Further, the matching mode is preferably tight fitting, so that the adapter 3 and the connecting pipe 2 can be positioned without a fixture during subsequent welding. The second welding ring 6 is blocked by the straight pipe section 30 and stays against the end face 301 of the straight pipe section 30. During the subsequent tunnel furnace welding, the second welding ring 6 melts under the action of the high temperature of the tunnel furnace. Under the action of capillary phenomenon, part of the molten solder penetrates and flows into the fitting gap between the straight pipe section 30 and the first connecting part 21. Furthermore, another part of the molten solder penetrates along the surface of the connecting section 20 and flows into the fitting gap between the second connecting part 22 and the inner wall of the through hole 11. After the molten solder cools, a weld is formed, thereby achieving connection and playing a sealing role. In order to better guide the flow of solder, at least part of the outer wall of the connection section 20 is provided with a drawing portion 29, which is made by a drawing process. The drawing tool moves along the axial direction of the connection tube 2 on the outer wall surface of the connection tube 2 to obtain the drawing portion 29 extending along the axial direction of the connection tube 2, and is evenly distributed in the circumference of the connection section 20; the drawing portion 29 can also be replaced by a groove, a convex point or a convex mark, etc. The setting of the drawing portion 29 can achieve a tight fit when the connection tube 2 is matched with the adapter 3 and the main tube 1, and the matching part has a matching gap. The second welding ring 6 melts into flowing solder, and the solder penetrates into the matching gap through capillary phenomenon. After cooling, a weld is formed, which plays a role of connection and sealing. The drawing portion 29 can fully cover the outer wall of the connection section 20, or only cover part of the outer wall, such as the outer wall corresponding to the first connection part 21 and the second connection part 22. When fully covered, it is convenient to process and more conducive to guiding the solder to flow into the matching gap between the second connection part 22 and the inner wall of the through hole 11.

[0032] The first welding ring 5 melts under the action of the high temperature of the tunnel furnace, and a part of the molten solder fills part of the accommodating cavity 4, and a part of it penetrates and flows into the fitting gap between the fixing part 31 and at least a part of the side wall part 10 of the outer periphery of the through hole 11. The molten solder forms a weld after cooling, thereby realizing the connection and sealing between the fixing part 31 and at least a part of the side wall part 10 of the outer periphery of the through hole 11. To summarize, the connection method of the gas collecting pipe subassembly 200 adopts tunnel furnace welding. First, the second welding ring 6 is sleeved on the connecting pipe 2; then the connecting pipe 2 is pressed into the adapter 3 to a suitable position, and a tight fit is adopted between the connecting pipe 2 and the straight pipe section 30 of the adapter 3, which can play a role of pre-fixation. The first welding ring 5 is placed in the accommodating cavity 4 formed by the adapter 3 and the first outer wall portion 24 of the connecting pipe 2. The inner diameter of the first welding ring 5 is larger than the outer diameter of the first outer wall portion 24. The inner diameter of the lower welding ring should be clarified here. Generally, in order to facilitate installation, the welding ring generally adopts an open welding ring. The inner diameter of the welding ring in this application refers to the inner diameter of the welding ring after the welding ring is installed. Assemble the connecting pipe 2 and the adapter 3 into an adapter assembly 300, assemble the adapter assembly 300 and the main pipe 1, and extend the first end portion 23 of the connecting pipe 2 through the through hole 11 into the cavity of the main pipe 1. The second connecting portion 22 of the connecting pipe 2 and the inner wall of the through hole 11 are tightly matched, which can play a role of pre-fixing; finally, put the assembled gas collecting pipe subassembly 200 into a tunnel furnace for welding, and the first welding ring 5 and the second welding ring 6 melt under the action of high temperature and flow into the matching gap of each component, and form a weld after cooling. The formation of the weld can not only connect the various components, but also play a role of strengthening the sealing.

[0033] Furthermore, there is a matching gap between the inner wall surface of the fixing portion 31 and the outer wall surface of at least part of the side wall portion 10 of the outer periphery of the through hole 11, and the two are connected by brazing, and the welding method can be tunnel furnace brazing. Solder is filled between at least part of the inner wall surface of the fixing portion 31 and the outer wall surface of at least part of the side wall portion 10 of the outer periphery of the through hole 11, and the solder forms a weld seam, which plays a role in connection, fixing and sealing. In addition, if the matching gap between the two is too large, not only a lot of solder needs to be filled, but it is also easy to cause leakage due to poor welding. If the gap is too small, it will affect the flow of the solder, so that the solder is not filled in place, resulting in poor welding and leakage. Therefore, the shape of the inner wall surface of the fixing portion 31 is adapted to the shape of the outer wall surface of at least part of the side wall portion 10 of the outer periphery of the through hole 11, and it is relatively easy to set a suitable matching gap between the two. The adapter 3 is an integrally formed structure. In order to facilitate welding with the stainless steel main pipe 1, the material of the adapter 3 is preferably stainless steel. Stainless steel, as a material with high hardness and strong toughness, presents certain challenges in stamping processing. The sheet metal can be stamped by a progressive stamping die, and multiple stamping processes can be performed by the progressive stamping die. This is more conducive to the forming of the adapter 3 and reduces subsequent deformation due to the resilience of the stainless steel material. In this way, the shapes of the fixing portion 31 and at least part of the side wall portion 10 of the outer periphery of the through hole 11 can be kept compatible and a suitable fitting clearance can be maintained, which is beneficial to improving the welding quality and life.

[0034] Furthermore, the adapter 3 is provided with a straight pipe section 30, which extends along the axis direction perpendicular to the main pipe 1. The straight pipe section 30 and part of the outer wall of the connecting pipe 2 are tightly matched and connected by brazing. The brazing method can be tunnel furnace brazing; during the manufacturing process, the connecting pipe 2 needs to be pressed into the adapter 3 first, and the straight pipe section 30 and part of the outer wall of the connecting pipe 2 are tightly matched, which can play a role of pre-fixation. Of course, the straight pipe section 30 and the connecting pipe 2 can also be installed and positioned by a fixture, but it is more convenient to use a tight fit. In the subsequent welding, no fixture is required, which makes the processing convenient. The welding length L1 between the straight pipe section 30 and the connecting pipe 2 is defined to meet: L1 ≥ 3mm. This setting meets the welding length between the two welded parts, which is conducive to improving the welding strength and welding quality between the two. In addition, the corrosion resistance is also increased, reducing the risk of leakage due to corrosion.

[0035] The present application also provides a connecting pipe 2, see Figure 8 The connecting pipe 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, and an axial space is provided between the transition section 27 and the end face 301 of the straight pipe section 30 for placing the second welding ring 6. After the second welding ring 6 is melted, at least part of the axial space is filled with solder.

[0036] This application also provides another connecting pipe 2, see Fig. 9 The connecting pipe 2 is provided with a boss portion 250, and the boss portion 250 is provided at the end opposite to the first end portion 23. The boss portion 250 extends along the radial direction of the adapter 3 toward the axial direction away from the adapter 3; along the axial direction of the adapter 3, there is an axial space between the boss portion 250 and the end face 301 of the straight pipe section 30 of the adapter 3, which is used to place the second welding ring 6. After the second welding ring 6 is melted, part of the solder fills at least part of the axial space.

[0037] See also Figure 1-Figure 2 In the refrigerant pipeline of the air-conditioning system, a collecting pipe assembly 100 is often used to distribute the flow of refrigerant. This collecting pipe assembly 100 is mostly connected to the inlet and outlet ends of the condenser and the evaporator. The traditional collecting pipe assembly 100 is made entirely of copper, which has a high material cost. In order to reduce costs, the current technology has produced a collecting pipe assembly in which the main pipe 1 of the collecting pipe assembly 100 is made of stainless steel pipe, and then the branch pipe 8 made of copper is welded to the main pipe 1. However, in the actual production process, the branch pipe 8 made of copper has the problem of sealing when welded to the main pipe 1; on the other hand, due to the large demand for the collecting pipe assembly 100, the main pipe 1 made of stainless steel, although the cost is reduced in a certain length, is still very high because the branch pipe 8 is made of copper.

[0038] The gas collecting pipe assembly 100 includes a plurality of branch pipes 8 , the number of which is the same as the number of the connecting pipes 2 . At this time, the connecting pipes 2 serve as transition pipes, and the material of at least some of the branch pipes 8 is the same as that of the connecting pipes 2 .

[0039] Specifically, the materials of the connecting pipe 2 and the branch pipe 8 are the same, both of which include copper. The branch pipe 8 is a copper pipe, and the connecting pipe 2 and the branch pipe 8 are welded one by one by flame brazing. If the copper branch pipe 8 enters the tunnel furnace together with the adapter 3, the main pipe 1, and the connecting pipe 2, the copper branch pipe 8 is annealed into a soft state after welding, and it is very easy to deform and discolor during the production, turnover and transportation process. In addition, the branch pipe 8 may be relatively long, and it is not convenient to weld it in the tunnel furnace. For some customers, they can only purchase the subassembly 200 of the gas collecting pipe without the branch pipe 8, which is convenient for transportation; for the manufacturer of the gas collecting pipe assembly, the gas collecting pipe subassembly 200 (without the branch pipe 8) is more convenient for water inspection tests. It can also solve the problem of reduced fatigue life of pipe fittings caused by coarse grains after brazing in the copper tube furnace. The connecting pipe 2 and the branch pipe 8 are welded by flame brazing, which can solve the above technical problems.

[0040] This application also provides another branch pipe 8, see Fig.12The branch pipe 8 includes a joint 80 and a pipe 81. The material of the joint 80 is the same as that of the connecting pipe 2, both of which are made of copper. The material of the pipe 81 is made of stainless steel. The joint 80 and the pipe 81 are welded together, and the welding method can be tunnel furnace welding. The joint 80 and the connecting pipe 2 are welded by flame brazing. The connecting pipe 2 here can be understood as a transition pipe. The pipe 81 is made of stainless steel, which can further reduce the cost of the gas collecting pipe assembly 100.

[0041] The present application provides a method for processing a gas collecting pipe assembly, the method comprising the following steps:

[0042] Providing a connecting pipe 2, an adapter 3 and a first welding ring 5;

[0043] The connecting pipe 2 and the adapter 3 are assembled so as to be matched and connected with each other to form an adapter assembly 300 having an accommodating cavity 4; the accommodating cavity 4 is mainly used to place the welding ring required for brazing.

[0044] Placing the first welding ring 5 in the accommodating cavity 4;

[0045] A main pipe 1 having a side wall portion 10 with a through hole 11 is provided, and the through hole 11 penetrates the side wall portion 10 of the main pipe 1;

[0046] Assemble the adapter assembly 300 and the main pipe 1 , extend the first end 23 of the connecting pipe 2 through the through hole 11 into the cavity of the main pipe 1 , and tightly fit a portion of the outer wall of the connecting pipe 2 with the inner wall of the through hole 11 to form a subassembly 200 .

[0047] The subassembly 200 is subjected to tunnel furnace welding.

[0048] The gas collecting pipe assembly 100 manufactured by the above processing method, first, the main pipe 1 and the connecting pipe 2 are connected together by using the adapter 3, and the adapter 3 increases the welding strength between the main pipe 1 and the connecting pipe 2; then, the main pipe 1 is provided with a plurality of through holes 11. If the plurality of through holes 11 are processed on the main pipe 1 by the method of the prior art, the risk of the wall of the main pipe 1 being broken is greater. The adapter 3 can be processed separately, which can reduce the problems such as the breakage of the main pipe 1 caused by multiple flanging, and further reduce the difficulty of product processing and the product defect rate; in addition, the first end portion 23 of the connecting pipe 2 passes through the through hole 11 and extends into the cavity of the main pipe 1, and part of the outer wall of the connecting pipe 2 is The part is tightly matched with the inner wall of the through hole 11. The tight fit setting can be pre-positioned before brazing without the need for additional tooling and fixtures, further reducing the difficulty of product processing; finally, the subassembly 200 is welded by a tunnel furnace, so that the three components of the main pipe 1, the adapter 3, and the connecting pipe 2 can be welded at one time, reducing the number of welding steps; and a first welding ring 5 is placed in the accommodating cavity 4 of the adapter assembly 300. During tunnel furnace brazing, the first welding ring 5 will melt and penetrate into and fill the various matching gaps of the gas collecting pipe subassembly 200, which not only realizes the connection function but also plays a sealing role to prevent the refrigerant from leaking from the connection between the connecting pipe 2 and the main pipe 1.

[0049] Before assembling the connecting pipe 2 and the adapter 3, the processing method of the gas collecting pipe assembly includes the following steps:

[0050] A stainless steel sheet metal part is provided, and the sheet metal part is subjected to a stamping process by a progressive die to obtain a transition part 3 with a straight pipe section 30;

[0051] The connecting pipe 2 and the adapter 3 are assembled so that a portion of the outer wall of the connecting pipe 2 is matched and connected with at least a portion of the inner wall of the straight pipe section 30 to form an adapter assembly 300 .

[0052] The adapter 3 in the present application is an integrally formed structure. In order to facilitate welding with the stainless steel main pipe 1, the material of the adapter 3 is stainless steel. Stainless steel, as a material with high hardness and strong toughness, presents certain challenges in stamping processing. The sheet metal can be stamped by a progressive die, and multiple molding can be performed by the progressive die, which is more conducive to the molding of the adapter 3 and reduces subsequent deformation due to the resilience of the stainless steel material.

[0053] Before placing the first welding ring 5, the following steps are also included:

[0054] The sheet metal part is punched by a progressive die to punch out an adapter 3 with a step portion 32 and a fixing portion 31; the step portion 32 is formed between the fixing portion 31 and the straight pipe section 30;

[0055] The first end portion 23 of the connecting pipe 2 passes through the straight pipe section 30 . At this time, an accommodating chamber 4 is formed between a portion of the outer wall of the connecting pipe 2 and the inner wall of the step portion 32 .

[0056] The process of assembling the connecting pipe 2 and the adapter 3 also includes the following steps:

[0057] Providing a copper tube, processing the copper tube to obtain a copper tube blank of a connecting tube 2, and machining a part of the outer wall of the copper tube blank to obtain a connecting tube 2 with a connecting section 20;

[0058] Providing a second welding ring 6, and sleeve the second welding ring 6 on the outer side of the connecting pipe 2;

[0059] The first end 23 of the connecting pipe 2 with the second welding ring 6 is pressed through the straight pipe section 30 to a suitable position, so that part of the outer wall of the connecting section 20 is tightly matched with the inner wall of the straight pipe section 30, and the second welding ring 6 is set against the end surface 301 of the straight pipe section 30. The suitable position here refers to the first end 23 extending into the cavity of the main pipe 1.

[0060] The material of the second welding ring 6 can be bronze solder or phosphor copper solder; the second welding ring 6 is an open welding ring, and the second welding ring 6 is sleeved on the outer side of the connecting pipe 2; the connecting pipe 2 is pressed into the adapter 3, so that the inner wall of the connecting section 20 and the straight pipe section 30 are tightly matched, and as the connecting pipe 2 is inserted and moved, the second welding ring 6 is retained and abutted against the end face 301 of the straight pipe section 30. The setting of the second welding ring 6 further improves the welding quality and sealing of the subassembly 200. Specifically, the second welding ring 6 melts under the high temperature of the tunnel furnace, and a part of the melted solder fills the matching gap between the straight pipe section 30 and the outer wall of the connecting section 20, and a part of the melted solder penetrates along the surface of the connecting section 20 and flows into the matching gap between the outer wall of the connecting section 20 and the inner wall of the through hole 11, and forms a weld after cooling, which plays a role in connecting and strengthening the sealing.

[0061] Furthermore, before assembling the adapter assembly 300 and the main pipe 1, the following steps are also included:

[0062] A first soldering ring 5 is provided, and the inner diameter of the first soldering ring 5 is larger than the outer diameter of the connecting section 20. The first soldering ring 5 is placed in the accommodating cavity 4 so that the inner surface of the first soldering ring 5 and the outer wall surface of the connecting section 20 have a radial spacing. In this way, after the first soldering ring 5 is melted under the action of high temperature, more melted solder flows into the matching gap between the fixing portion 31 and the side wall portion of the outer periphery of the through hole 11, which is conducive to improving the welding strength and sealing performance between the two.

[0063] The processing of the connecting section 20 also includes the following steps:

[0064] A wire drawing tool is provided to perform wire drawing on a portion of the outer wall of the copper tube blank to obtain a connection section 20 with a wire drawing portion 29. Specifically, the wire drawing tool starts from the first end 23 and moves to a suitable position along the axial direction of the connection tube 2 to perform wire drawing, and processes a portion of the outer wall of the connection tube 2 to obtain a connection section 20 with a wire drawing portion 29. The wire drawing portion 29 extends along the axial direction of the connection section 20 and is evenly distributed in the circumference of the connection section 20; the wire drawing portion 29 can be continuously arranged on the outer wall of the connection section 20, or can be arranged in sections on a portion of the outer wall of the connection section 20, such as on the outer wall corresponding to the first connection section 21 and the second connection section 22. The wire drawing portion 29 can also be replaced by grooves, convex points or convex marks. The setting of the wire drawing portion 29 can achieve a tight fit when the connecting pipe 2 is matched with the adapter 3 and the main pipe 1, and can also make the matching parts have a matching gap. The welding ring melts at the high temperature of the tunnel furnace, and the molten solder penetrates into the matching gap through capillary phenomenon, and forms a weld after cooling, which plays a role of connection and sealing.

[0065] In order to improve the welding strength and quality of the connecting pipe 2 and the adapter 3, and to enhance the corrosion resistance of the welding part, and reduce the risk of leakage due to corrosion, the processing method also includes the following steps:

[0066] Insert the connecting section 20 into the straight pipe section 30 so that the first end 23 of the connecting section 20 passes through the straight pipe section 30 and is inserted into the cavity of the main pipe 1 . The matching length L1 of the connecting section 20 and the straight pipe section 30 is ≥3 mm.

[0067] The gas collecting pipe assembly 100 further includes a branch pipe 8, and the processing method further includes the following steps:

[0068] Provide a branch pipe 8, and weld the branch pipe 8 to the connecting pipe 2 by flame brazing. The material of the end portion of the branch pipe 8 connected to the connecting pipe 2 is the same as that of the connecting pipe 2, and the branch pipe 8 is welded by flame brazing. It is more convenient to use flame brazing for welding the same materials.

[0069] Specifically, a copper tube is provided, and the copper tube is machined to obtain a branch tube 8, and the branch tube 8 is welded to the connecting tube 2 by flame brazing. Further, the second end 25 of the connecting tube 2 is flame brazed and connected to the branch tube 8, and the second end 25 is opposite to the first end 23, and the outer wall of the second end 25 may be provided with a wire drawing portion or may not be provided. The connecting tube 2 and the branch tube 8 are welded by flame brazing, and the branch tube 8 is a copper tube. If the copper branch tube 8 enters the tunnel furnace together with the adapter 3, the main tube 1, and the connecting tube 2, the copper branch tube 8 is annealed into a soft state after welding, and it is very easy to deform and discolor during the production, turnover and transportation process. In addition, the branch tube 8 may be relatively long, and it is not convenient to weld it in the tunnel furnace. For some customers, they can only purchase the subassembly 200 of the gas collecting pipe without the branch tube 8, which is convenient for transportation; for the manufacturer of the gas collecting pipe assembly, the subassembly 200 of the gas collecting pipe assembly 100 (with the branch tube 8 removed) is more convenient for water inspection test. It can also solve the problem of reduced fatigue life of pipe fittings caused by coarse grains after brazing in a copper tube furnace. The connecting pipe 2 and the branch pipe 8 are welded by flame brazing to solve the above technical problem.

[0070] The present application also provides another embodiment of a branch pipe 8, the processing method of which includes the following steps:

[0071] Providing a copper tube, and machining the copper tube to obtain a joint portion 80;

[0072] Providing a stainless steel pipe, and machining the stainless steel pipe to obtain a pipe 81;

[0073] The joint portion 80 and the pipe 81 are brazed to form the branch pipe 8;

[0074] The joint portion 80 of the branch pipe 8 is welded to the connecting pipe 2 by flame brazing. The second end portion 25 of the connecting pipe 2 is connected to the branch pipe 8 by flame brazing, and the second end portion 25 is opposite to the first end portion 23. The outer wall portion of the second end portion 25 may be provided with a wire drawing portion or may not be provided. The pipe 81 is made of stainless steel, which can not only reduce the cost of the branch pipe 8, but also further reduce the cost of the gas collecting pipe assembly 100.

[0075] The above specific examples are used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A method for processing a gas collecting pipe assembly, the method comprising the following steps: Providing a connecting pipe (2), an adapter (3) and a first welding ring (5); Assembling the connecting pipe (2) and the adapter (3) to form an adapter assembly (300) having a receiving cavity (4); placing the first welding ring (5) in the receiving cavity (4); A main pipe (1) is provided, wherein a side wall portion (10) of the main pipe (1) is provided with a through hole (11) penetrating the side wall portion (10); Assembling the adapter assembly (300) and the main pipe (1), passing the first end portion (23) of the connecting pipe (2) through the through hole (11) and extending into the cavity of the main pipe (1), and a portion of the outer wall of the connecting pipe (2) tightly fits with the inner wall of the through hole (11), thereby forming a subassembly (200); The subassembly (200) is subjected to tunnel furnace brazing.

2. The processing method according to claim 1, before assembling the connecting pipe (2) and the adapter (3), further comprises the following steps: Providing a stainless steel sheet metal part, and performing a stamping process on the sheet metal part using a progressive die to obtain the adapter (3) with a straight pipe section (30); The connecting pipe (2) and the adapter (3) are assembled so that a portion of the outer wall of the connecting pipe (2) is matched and connected with at least a portion of the inner wall of the straight pipe section (30), thereby forming the adapter assembly (100).

3. The processing method according to claim 2, characterized in that: Before placing the first welding ring (5), the following steps are also included: The sheet metal part is subjected to a stamping process by using the progressive die to form an adapter (3) having a step portion (32) and a fixing portion (30); the step portion (32) is formed between the fixing portion (30) and the straight pipe section (30); The first end portion (23) of the connecting pipe (2) is passed through the straight pipe section (30), so that a portion of the outer wall of the connecting pipe (2) and the inner wall of the step portion (32) form the accommodating cavity (4).

4. The processing method according to claim 2 or 3, characterized in that: Before assembling the connecting pipe (2) and the adapter (3), the following steps are also included: Providing a copper tube, machining the copper tube to obtain a copper tube blank of the connecting tube 2, and machining a portion of the outer wall of the copper tube blank to obtain the connecting tube (2) with a connecting section (20); A second welding ring (6) is provided, and the second welding ring (6) is sleeved on the outer side of the connecting pipe (2); the first end (23) of the connecting pipe (2) sleeved with the second welding ring (6) is pressed and passed through the straight pipe section (30) into the cavity of the main pipe 1, so that a part of the outer wall of the connecting section (20) is tightly matched with the inner wall of the straight pipe section (30), so that the second welding ring (6) is close to the end surface (301) of the straight pipe section (30).

5. The processing method according to claim 4, characterized in that: Before assembling the adapter assembly (300) and the main pipe (1), the following steps are also included: Providing welding ring material to manufacture a first welding ring (5) having an inner diameter greater than an outer diameter of the connecting section (20); The first welding ring (5) is sleeved on the outside of the connecting section (20) and placed in the accommodating cavity (4), so that the inner surface of the first welding ring (5) and the outer wall of the connecting section (30) have a radial spacing.

6. The processing method according to claim 4 or 5, characterized in that: The processing of the connecting section (20) further includes the following steps: A wire drawing tool is provided, which starts from the first end (23) and moves to a suitable position along the axial direction of the connecting tube (2) to perform wire drawing processing, and processes part of the outer wall of the connecting tube (2) to obtain the connecting section (20) with a wire drawing portion (29).

7. The processing method according to any one of claims 1 to 6, characterized in that: The method further comprises the following steps: providing a copper tube, machining the copper tube to obtain a branch tube (8), and connecting the branch tube (8) to the connecting tube (2) by flame brazing; or, Providing a copper tube, and machining the copper tube to obtain a joint portion (80); Providing a stainless steel pipe, and machining the stainless steel pipe to obtain a pipe (81); The joint portion (80) and the pipe (81) are welded by brazing to form a branch pipe (8); The joint portion (80) and the connecting pipe (2) are connected by flame brazing.

8. A gas collecting pipe assembly, characterized in that: The gas collecting pipe assembly (100) comprises a main pipe (1) and a plurality of adapter assemblies. The side wall portion (10) of the main pipe (1) is provided with a plurality of through holes (11); the through holes (11) penetrate the side wall portion (10); the adapter assembly comprises a connecting pipe (2) and an adapter (3); the adapter (3) sealably connects the connecting pipe (2) and the main pipe (1); the number of the connecting pipe (2), the adapter (2) and the through holes (11) is the same; the connecting pipe (2) comprises a connecting section (20). The connecting section (20) comprises a first end portion (23), the first end portion (23) passes through the through hole (11) and extends into the cavity of the main pipe (1); the adapter (3) comprises a straight pipe section (30) and a fixing portion (31), the fixing portion (30) is connected to at least a portion of the side wall portion (10) of the outer periphery of the through hole (11) by brazing, a portion of the outer wall portion of the connecting section (20) is tightly matched with the inner wall portion of the through hole (11), and the connecting section (20) is connected to the straight pipe section (30) by brazing.

9. The gas collecting pipe assembly according to claim 8, characterized in that: The invention comprises a branch pipe (8), the number of the branch pipe (8) is the same as that of the connecting pipe (2), the connecting pipe (2) comprises a second end portion (25), the second end portion (25) is arranged opposite to the first end portion (23), and the branch pipe (8) and the second end portion (25) are connected in a one-to-one correspondence through flame brazing.

10. The gas collecting pipe assembly according to claim 8 or 9, characterized in that: Part of the outer wall of the connecting section (20) is connected to the straight pipe section (30) by brazing, and the matching welding point between the two is filled with solder; the fixing portion (31) is connected to at least part of the side wall (10) of the outer periphery of the through hole (11) by brazing, and the matching welding point between the two is filled with solder; part of the outer wall of the connecting section (20) is connected to the inner wall of the through hole (11) by brazing, and the matching welding point between the two is filled with solder.

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