Liquid collecting pipe assembly machining method, liquid collecting pipe assembly, heat exchanger and refrigerating system

Abstract

The invention provides a collector tube assembly machining method, a collector tube assembly, a heat exchanger and a refrigerating system. The collector tube assembly comprises a main body part and connecting tube parts, and the machining method comprises the steps that the main body part is machined, specifically, main tube holes are machined in the circumferential wall of a stainless steel main tube, and a main tube connecting part used for welding the connecting tube parts is formed in each main tube hole to form the main body part; the hole diameter phi 0 of the main pipe connecting part is larger than or equal to 18 mm and smaller than or equal to 65 mm. The copper connecting pipe is inserted into the stainless steel sleeve, and the copper connecting pipe and the stainless steel sleeve are welded to form the connecting pipe part. Assembling and welding the main body part and the pipe connecting part: assembling the front end of the stainless steel sleeve in the pipe connecting part to a main pipe connecting part on the main body part, and welding the assembling part of the stainless steel sleeve and the main pipe connecting part by adopting self-fluxing circular seam welding or self-fluxing wire feeding type circular seam welding.

Description

Technical Field

[0001] The invention relates to the field of refrigeration accessories, and in particular to a method for processing a liquid collecting pipe assembly, a liquid collecting pipe assembly, a heat exchanger and a refrigeration system. Background Art

[0002] In the refrigeration system, in order to realize the collection or distribution of refrigerant, it is necessary to set a collecting pipe assembly at both ends of the heat exchanger. In the collecting pipe assembly, a connecting pipe hole needs to be opened on the peripheral wall of the main pipe to realize the vertical insertion and welding of the branch pipe. In order to improve the welding strength of the branch pipe, the connecting pipe hole is usually processed into a flanging structure; however, due to the limitation of the amount of material migration during flanging, the flanging height of the connecting pipe hole is also usually low (less than 2.5mm). In recent years, the high price of copper has caused refrigeration system accessories to gradually develop in the low-cost direction of "less copper, steel instead of copper". Compared with copper materials, the flanging height of the connecting pipe hole on the stainless steel main pipe is lower. When it is brazed with the branch pipe (especially the brazing of dissimilar metals with the copper branch pipe), the connecting pipe hole with limited flanging height leads to a very short length of the brazing layer at this place, which not only has low connection strength but also has poor pressure resistance and corrosion resistance.

[0003] To this end, it is proposed to add a connecting sleeve between the stainless steel main pipe and the branch pipe, and use a first brazing material with better corrosion resistance to perform tunnel furnace welding between the connecting sleeve and the pipe hole to improve the corrosion resistance of this part; then use a second brazing material to perform tunnel furnace brazing of the connecting sleeve and the branch pipe. Although this scheme can improve the corrosion resistance of the brazing layer at the pipe hole to a certain extent, the problem of low connection strength and poor pressure resistance at this part is still unsolved due to the limitation of the flange height of the pipe hole. In addition, in this scheme, the stainless steel main pipe needs to be brazed in the tunnel furnace at least twice to achieve the welding of the connecting sleeve and the branch pipe, and the length of the stainless steel main pipe is generally long (usually more than 300mm). Multiple tunnel furnace brazing not only has high welding cost but also extremely low welding efficiency, so it is difficult to achieve the low-cost design of "less copper, steel instead of copper". Furthermore, since the current refrigeration system pipelines are still mainly copper pipelines, after the liquid collecting pipe assembly is stainless steeled, a copper connecting section needs to be set at the end of the branch pipe to facilitate welding. After multiple tunnel furnace brazing, the grain size of the copper connecting section will become larger, which seriously affects its strength and pressure resistance.

[0004] In order to solve the problem of low connection strength at the pipe hole, the inventor has also proposed to add multiple lining plates on the peripheral wall of the stainless steel main pipe, and use the superposition of multiple lining plate holes to increase the brazing depth of the copper pipe. However, the increase in the number of lining plates will lead to a significant increase in the penetration path and penetration area of ​​the brazing material, and welding problems such as cold welding and broken welding are very likely to occur between adjacent lining plates. Further, the invention proposes a pipe connection structure with an outer lining seat in Chinese patent CN221004242U, and the brazing depth of the pipe is increased through the connection hole on the outer lining seat. In this scheme, the depth of the connection hole is not limited by the material and wall thickness of the main pipe, and the length of the brazing layer at the connection hole can be set according to the needs of the pipe, thereby solving the problem of insufficient brazing depth at the pipe hole when the pipeline is vertically connected. However, the special-shaped outer lining seat structure makes the component difficult to process, and it can only be formed by casting or machining. Casting not only has high processing costs and low efficiency, but also has the problem of poor connection strength due to defects such as large grain size and a certain amount of pores and inclusions in the structure. However, machining has the problems of difficult tool processing, high cost, low efficiency, and difficulty in ensuring the curvature consistency of the sheet base after processing. When the sheet base is attached to the outer wall of the main pipe, the gap between the two is poorly uniform, and welding quality problems such as cold welding and broken welding are very likely to occur during brazing. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a method for processing a liquid collecting pipe assembly, a liquid collecting pipe assembly, a heat exchanger and a refrigeration system with excellent welding strength and simple and efficient welding process.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a method for processing a manifold assembly, wherein the manifold assembly includes a main body component and a connecting pipe component. The processing method includes:

[0007] Processing of the main body: main pipe holes are processed on the peripheral wall of the stainless steel main pipe, and a main pipe connection part for welding the pipe connection part is formed at each main pipe hole to form the main body part; the hole diameter Φ0 at the main pipe connection part is greater than or equal to 18mm and less than or equal to 65mm;

[0008] Processing of pipe parts: insert the copper pipe into the stainless steel sleeve, and weld the two to form the pipe parts;

[0009] Assemble and weld the main body component and the connecting pipe component: Assemble the front end of the stainless steel sleeve in the connecting pipe component to the main pipe connecting portion on the main body component, and use self-fluxing girth welding or self-fluxing wire feeding girth welding for welding at the assembly point of the two.

[0010] According to one embodiment of the present invention, the processing of the connecting pipe component further includes:

[0011] When inserting the copper pipe into the stainless steel sleeve, ensure that the insertion depth L1 is greater than or equal to the larger of 0.05Φ0 and 2.5mm, where Φ0 is the hole diameter at the main pipe connection part;

[0012] The stainless steel sleeve and the copper pipe are welded by self-fluxing welding or wire feeding welding to form a pipe weld. The pipe weld is a continuous circumferential weld or a plurality of local welds distributed at intervals.

[0013] According to one embodiment of the present invention, the pipe weld is an arc weld, and the process of welding the pipe weld includes:

[0014] Using an arc welding torch to heat the end of the stainless steel sleeve, partially melting at least one end of the stainless steel sleeve and the copper pipe to form a molten pool;

[0015] The arc welding gun or the welding workpiece formed by the stainless steel sleeve and the copper pipe is rotated to form an arc weld in the circumferential direction.

[0016] According to an embodiment of the present invention, after the molten pool is formed, a brazing material containing a third metal is introduced into the molten pool, and the brazing material is melted based on the heat of the arc to form a pipe weld containing the third metal element.

[0017] According to one embodiment of the present invention, the step of processing the connecting pipe component further includes:

[0018] The stainless steel sleeve and the copper pipe are assembled by brazing, and a pipe brazing layer is formed in the assembly gap between the stainless steel sleeve and the copper pipe;

[0019] Alternatively, the stainless steel sleeve and the copper pipe are welded by self-fluxing welding or wire feeding welding to form a pipe weld; then the sleeve-assembled stainless steel sleeve and the copper pipe are brazed to form a pipe brazing layer in the assembly gap between the stainless steel sleeve and the copper pipe.

[0020] According to one embodiment of the present invention, a tin bronze brazing material or a brazing material with a liquidus line below 920° C. is used to braze the stainless steel sleeve and the copper pipe to form a pipe brazing layer.

[0021] According to one embodiment of the present invention, when processing the pipe connection component, an exhaust hole is opened on the pipe wall of the copper pipe connection and / or the stainless steel sleeve, and when the sleeve is assembled, it is ensured that the exhaust hole is located at the overlapping part of the copper pipe connection and the stainless steel sleeve;

[0022] When the stainless steel sleeve and the copper pipe are brazed together, the gas in the assembly gap between the stainless steel sleeve and the copper pipe is discharged from the exhaust hole.

[0023] According to one embodiment of the present invention, the processing method further includes:

[0024] When processing the main parts: fit the stainless steel receiving plate to the outer peripheral wall of the main pipe, and ensure that the receiving hole on the stainless steel receiving plate is basically coaxial with the main pipe hole; use a tunnel furnace to braze the stainless steel receiving plate and the main pipe, and form a main pipe connection part at the receiving hole;

[0025] When assembling and welding the main body component and the connecting pipe component: the front end of the stainless steel sleeve is inserted into the receiving hole, and the stainless steel sleeve is coaxially positioned based on the receiving hole; then, the outer wall of the stainless steel sleeve and the receiving hole are welded by self-fluxing girth welding or self-fluxing wire feeding girth welding.

[0026] According to one embodiment of the present invention, the processing method further includes:

[0027] When processing the main body component: the diameter of the receiving hole is set to be larger than the diameter of the main pipe hole, and the diameter difference between the two is basically close to or larger than the wall thickness of the front end of the stainless steel sleeve; when assembling and welding the main body component and the connecting pipe component: the front end of the stainless steel sleeve is inserted into the receiving hole until the front end surface of the stainless steel sleeve abuts against the outer peripheral wall of the main pipe, and the insertion depth of the stainless steel sleeve is limited based on the outer peripheral wall of the main pipe;

[0028] Alternatively, when processing the main body component: the diameter of the receiving hole is set to be basically close to the diameter of the main pipe hole; when assembling and welding the main body component and the connecting pipe component, the front end of the stainless steel sleeve is inserted into the receiving hole and the main pipe hole.

[0029] According to one embodiment of the present invention, the processing method further includes:

[0030] When processing the main body component: each main pipe hole is flanging-processed to form a flanging portion, and a main pipe connecting portion is formed at the flanging portion;

[0031] When assembling and welding the main body component and the connecting pipe component: the front end of the stainless steel sleeve is inserted into the flange part, and the stainless steel sleeve is coaxially positioned based on the flange part; then, the outer wall of the stainless steel sleeve and the flange part are welded by self-fluxing girth welding or self-fluxing wire feeding girth welding.

[0032] According to one embodiment of the present invention, when assembling and welding the main body component and the connecting pipe component, the front end of the stainless steel sleeve in the connecting pipe component is butt-jointed and assembled with the main pipe connection portion on the main body component; thereafter, the butt joint is welded using self-fluxing girth welding or self-fluxing wire feeding girth welding.

[0033] On the other hand, the present invention also provides another method for processing a manifold assembly, the manifold assembly comprising a main body component and a connecting pipe component, the processing method comprising:

[0034] Processing of main parts: a main pipe connection part is set at the shaft end of the stainless steel main pipe, and the hole diameter at the main pipe connection part is greater than or equal to 18mm;

[0035] Processing of pipe parts: insert the copper pipe into the stainless steel sleeve, and weld the two to form the pipe parts;

[0036] Assemble and weld the main body component and the connecting pipe component: Assemble the front end of the stainless steel sleeve in the connecting pipe component to the main pipe connecting portion on the main body component, and use self-fluxing girth welding or self-fluxing wire feeding girth welding for welding at the assembly point of the two.

[0037] On the other hand, the present invention also provides another method for processing a manifold assembly, wherein the manifold assembly includes a main body component and a connecting pipe component, and the method for processing the manifold assembly includes:

[0038] Main parts processing:

[0039] A main pipe hole is machined on the peripheral wall of the stainless steel main pipe;

[0040] Process the receiving plate and fit it to the outer wall of the main pipe, and ensure that the receiving hole on the receiving plate is basically coaxial with the main pipe hole and the hole diameter Φ0 at the receiving hole is greater than or equal to 18mm and less than or equal to

[0041] 65mm;

[0042] Processing the copper connecting sleeve and inserting the front end of the copper connecting sleeve into the receiving hole;

[0043] The main body is formed by furnace brazing of the integral welding main pipe, the receiving plate and the copper connecting sleeve;

[0044] Copper pipe assembly welding: insert the copper pipe into the copper connecting sleeve of the main component and weld the two together by one or more combinations of self-fluxing welding, self-fluxing wire feeding welding, flame brazing or high-frequency brazing.

[0045] On the other hand, the present invention further provides a liquid collecting pipe assembly, which is processed by the above method, and the liquid collecting pipe assembly comprises:

[0046] The main body comprises a stainless steel main pipe, and a main pipe hole is provided on the peripheral wall of the main pipe, a main pipe connecting part is formed at the edge of the main pipe hole, and the hole diameter Φ0 of the main pipe connecting part is greater than or equal to 18 mm and less than or equal to 65 mm;

[0047] The pipe component comprises a stainless steel sleeve and a copper pipe, wherein the copper pipe is inserted into and welded into the stainless steel sleeve;

[0048] The front end of the stainless steel sleeve in the connecting pipe component is connected to the main pipe connecting part in the main body component through a self-melting ring weld or a self-melting wire feeding ring weld.

[0049] According to one embodiment of the present invention, the main body component also includes a stainless steel receiving plate welded to the outer peripheral wall of the main pipe, and a receiving hole basically coaxial with the main pipe hole is formed on the stainless steel receiving plate, and a main pipe connecting part is formed at the receiving hole to weld the front end of the stainless steel sleeve in the pipe connection component.

[0050] According to an embodiment of the present invention, the main pipe connection portion is a flange portion formed at the edge of the main pipe hole, and the flange portion is welded to the front end of the stainless steel sleeve in the pipe connection component.

[0051] According to an embodiment of the present invention, the front end of the stainless steel sleeve in the connecting pipe component is sleeve-fitted or butt-fitted to the main pipe connecting portion, and the assembly of the two is welded to form a self-fluxing girth weld or a self-fluxing wire-feeding girth weld.

[0052] According to one embodiment of the present invention, in the pipe component, a pipe weld is formed between the stainless steel sleeve and the copper pipe by autogenous welding or autogenous wire feeding welding, and the pipe weld is a continuous ring weld or a plurality of local welds distributed at intervals.

[0053] According to an embodiment of the present invention, the pipe weld is an arc weld formed by arc welding and the arc weld is formed between at least one end of the stainless steel sleeve and the copper pipe.

[0054] According to one embodiment of the present invention, a brazing layer formed by welding with tin bronze brazing material or brazing material with a liquidus line below 920° C. is formed in the assembly gap between the stainless steel sleeve and the copper pipe in the pipe component.

[0055] According to an embodiment of the present invention, at the overlapping portion of the stainless steel sleeve and the copper pipe, an exhaust hole for exhausting gas is formed on the pipe wall of the copper pipe and / or the stainless steel sleeve.

[0056] On the other hand, the present invention also provides another liquid collecting pipe assembly, which includes a main body component and a pipe connecting part. The main body component includes a stainless steel main pipe, and the main pipe shaft end is provided with a main pipe connecting part, and the hole diameter at the main pipe connecting part is greater than or equal to 18 mm. The pipe connecting part includes a stainless steel sleeve and a copper pipe connecting part, and the copper pipe connecting part is inserted and welded into the stainless steel sleeve. Among them, the front end of the stainless steel sleeve in the pipe connecting part is connected to the main pipe connecting part in the main body component through a self-melting girth weld or a self-melting wire feeding girth weld.

[0057] On the other hand, the present invention also provides another liquid collecting pipe assembly, which includes a main body component and a copper pipe. The main body component includes a stainless steel main pipe, a receiving plate and a copper connecting sleeve. A main pipe hole is opened on the peripheral wall of the main pipe. The receiving plate is welded to the outer peripheral wall of the main pipe. A receiving hole that is substantially coaxial with the main pipe hole is formed on the receiving plate, and the hole diameter Φ0 of the receiving hole is greater than or equal to 18 mm and less than or equal to 65 mm. The front end of the copper connecting sleeve is brazed and connected to the receiving hole. The copper pipe is inserted into the copper connecting sleeve of the main body component. A self-fluxing pipe weld and / or a pipe brazing layer formed by non-furnace brazing are formed between the copper connecting sleeve and the copper pipe. The pipe weld is a continuous ring weld or a plurality of local welds distributed at intervals formed by self-fluxing welding or self-fluxing wire feeding welding.

[0058] On the other hand, the present invention further provides a heat exchanger, which includes the above-mentioned collecting pipe assembly.

[0059] On the other hand, the present invention further provides a refrigeration system, which includes the above-mentioned collecting pipe assembly and / or heat exchanger.

[0060] In summary, the processing method of the collecting pipe assembly provided by the present invention divides the collecting pipe assembly into a main body component and a connecting pipe component that can be processed independently. After the two components are processed independently, they can be formed through a welding process. This setting makes the large-sized main body component not affected by the assembly and welding of the connecting pipe component, reduces the welding process of the large-sized main body component to reduce the processing cost and improve the processing efficiency; at the same time, the split processing of the main body component also makes it possible to match connecting pipe components of different structures or specifications and has good versatility. Furthermore, this setting also makes the copper connecting pipe not affected by the welding assembly of the main body component, and its welding method is more flexible and has better strength and ductility after welding.

[0061] In the pipe connection part, the setting of the stainless steel sleeve enables the same metal welding to be formed at the main pipe connection part with limited welding depth, which provides conditions for the use of self-melting girth welding or self-melting wire feeding girth welding to form a high-strength and dense joint weld. The weld formed by self-melting welding is formed by the melting of the base material and the mutual dissolution of the elements and then recrystallization in a homogeneous epitaxial manner. Its connection strength is much higher than the tin bronze brazing layer with loose metallographic structure formed by metallurgical diffusion and mutual dissolution. The excellent welding performance greatly reduces the influence of welding depth on welding strength, thereby effectively solving the problems of low welding strength and easy leakage caused by insufficient brazing depth at the main pipe connection of the existing collecting pipe assembly. In addition, the setting of the stainless steel sleeve also transfers the copper-steel dissimilar metal welding to the axial connection of the stainless steel sleeve and the copper pipe connection with arbitrarily adjustable assembly depth; the dissimilar metal welding between the two can be carried out by a combination of brazing and / or self-melting welding to ensure that the connection strength, air tightness and corrosion resistance of the welding point can well meet the requirements of the refrigeration system.

[0062] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 The figure is a schematic flow chart of the method for processing the liquid collecting tube assembly provided in the first embodiment of the present invention.

[0064] Figure 2 Shown Figure 1 Schematic diagram of the process of step S10.

[0065] Figure 3 Shown Figure 1 Schematic diagram of the process of step S20.

[0066] Figure 4 Shown is the use of Figure 1 A schematic structural diagram of a liquid collecting pipe assembly manufactured by the method shown.

[0067] Figure 5 Shown Figure 4 Schematic diagram of a partial cross section.

[0068] Figure 6 Shown Figure 5 Assembly diagram of the main body parts and the connecting pipe parts.

[0069] Figure 7 Shown Figure 5 A magnified schematic diagram of center A.

[0070] Figure 8 and Fig. 9 FIG. 1 is a partial cross-sectional schematic diagram of a liquid collecting pipe assembly in another embodiment of the present invention.

[0071] Fig.10 and Fig.11 Shown is a schematic diagram of the welding assembly of a connecting pipe component in another embodiment of the present invention.

[0072] Fig.12 and Fig. 12A Shown is a schematic structural diagram of a liquid collecting pipe assembly provided in another embodiment of the present invention.

[0073] Fig.13 FIG. 1 is a flow chart of step S20 in the method for processing a liquid collecting tube assembly according to the second embodiment of the present invention.

[0074] Fig.14 Shown is the use of Fig.13 A schematic partial cross-sectional view of a collecting pipe assembly obtained after processing by the method shown.

[0075] Fig.15 Shown Fig.14 Schematic diagram of the structure of the Zhongtong pipe.

[0076] Fig.16 Shown is a schematic structural diagram of a copper connecting pipe provided by another embodiment of the present invention.

[0077] Fig.17 Shown is a schematic structural diagram of a liquid collecting pipe assembly provided in Embodiment 3 of the present invention.

[0078] Fig.18 Shown Fig.17 Schematic diagram of the structure from another perspective.

[0079] Fig.19 Shown Fig.18 Schematic diagram of the cross section along line BB.

[0080] Fig. 20 Shown Fig.19 Enlarged schematic diagram of point C in the middle.

[0081] Fig.21 The figure is a schematic diagram of the process of the processing method of the liquid collecting pipe assembly provided in the fourth embodiment of the present invention.

[0082] Fig. 22 Shown is the use of Fig.21 A schematic structural diagram of a liquid collecting pipe assembly manufactured by the method shown.

[0083] Fig.23 Shown Fig. 22 Schematic diagram of a partial cross section.

[0084] Fig.24 The figure is a schematic diagram of the process of the processing method of the liquid collecting pipe assembly provided in the fifth embodiment of the present invention.

[0085] Fig.25 Shown is the use of Fig.24 A schematic structural diagram of a liquid collecting pipe assembly manufactured by the method shown. DETAILED DESCRIPTION

[0086] Embodiment 1

[0087] In the stainless steel collecting pipe assembly, the assembly depth of the pipe hole on the peripheral wall of the stainless steel main pipe is limited. When copper-steel dissimilar metal brazing is performed at this location, the short tin bronze brazing layer not only has low connection strength but also has poor corrosion resistance. In order to solve the problem of poor corrosion resistance, some people have proposed to add a connecting sleeve so that the first brazing material with better corrosion resistance can be used for welding at the pipe hole, but this solution still cannot solve the problem of low brazing strength at the pipe hole. In addition, in this solution, large-sized main pipes require at least two long tunnel furnace brazings to achieve the welding of the connecting sleeve and the branch pipe. Multiple furnace welding of large-sized components not only has low welding efficiency but also high welding cost, so it is difficult to achieve a low-cost design of "less copper, steel instead of copper".

[0088] In view of this, this embodiment provides an efficient processing method for a high-strength liquid collecting pipe assembly. Figures 1 to 7As shown, the liquid collecting pipe assembly provided in this embodiment includes a main body part 101 and a pipe connecting part 102. The processing method of the liquid collecting pipe assembly includes: Step S10, processing the main body part 101: processing the main pipe hole 11 on the peripheral wall of the stainless steel main pipe 1, and forming a main pipe connecting part for welding the pipe connecting part 102 at each main pipe hole 11 to form the main body part 101, and the hole diameter Φ0 at the main pipe connecting part is greater than or equal to 18mm and less than or equal to 65mm. Step S20, processing the pipe connecting part 102: inserting the copper pipe 4 into the stainless steel sleeve 3, and the two are welded to form the pipe connecting part 102. Step S30, assembling and welding the main body part 101 and the pipe connecting part 102: assembling the front end of the stainless steel sleeve 3 in the pipe connecting part 102 to the main pipe connecting part on the main body part 101, and the assembly of the two is welded by self-fluxing girth welding or self-fluxing wire feeding girth welding.

[0089] In this embodiment, only step S10 and step S20 are used to identify the processing steps of the main body component 101 and the connecting pipe component 102. The present invention does not limit the processing order of the two. During processing, the main body component 101 can be processed first, and then the connecting pipe component 102; the connecting pipe component 102 can be processed first, and then the main body component 101; or the two components can be processed simultaneously.

[0090] In this embodiment, the main body component 101 includes a stainless steel main pipe 1 and a stainless steel receiving plate 2 that is welded to the outer peripheral wall of the main pipe 1. The stainless steel receiving plate 2 is formed with a receiving hole 21 that is basically coaxial with the main pipe hole 11. A main pipe connecting portion is formed at the receiving hole 21 to weld the front end of the stainless steel sleeve 3 in the pipe connection component 102.

[0091] In the processing method of the collecting pipe assembly provided in this embodiment, the main body component 101 and the connecting pipe component 102 are processed independently, and after the processing of the two components is completed, they can be formed by a self-fluxing girth welding or a self-fluxing wire feeding girth welding. This arrangement makes the large-sized main body component 101 not affected by the welding and assembly of the connecting pipe component 102, and the large-sized main body component 101 does not need or only needs one tunnel furnace brazing, thereby greatly improving the welding efficiency and reducing the welding cost. At the same time, the welding of the connecting pipe component 102 is not limited by the main body component, and the connecting pipe components with smaller sizes are very flexible whether it is self-fluxing welding, brazing, or post-welding processing. Specifically, when the connecting pipe component 10 is brazed, the connecting pipe component 102 can also be placed vertically on the conveyor belt of the tunnel furnace to facilitate the penetration of the brazing material; in addition, even if the small-sized connecting pipe component 102 needs to be processed after welding (such as cleaning, etc.), it is also very convenient. Furthermore, when the stainless steel sleeve 3 and the copper pipe 4 are processed by self-melting welding, brass brazing or high-frequency brazing or other non-furnace brazing methods, the grain size of the copper pipe 4 will not be affected by long-term high temperature, so that the copper pipe 4 has high strength and ductility.

[0092] In addition, in the refrigeration industry, the installation dimensions of refrigeration products (such as heat exchangers) of different client manufacturers are different. When processing the liquid collecting pipe assembly, the copper pipe 4 needs to be customized according to the actual installation dimensions of the client product. Such a manufacturing method leads to a large number of product models in the production process, which seriously affects the production cycle and inventory pressure. In this embodiment, the independent processing of the main part 101 also enables it to be matched and welded with pipe parts 102 of various specifications. Specifically, the main part 101 can be prefabricated and stored in the warehouse through step S10; after the customer places an order, it is only necessary to process the pipe part 102 in step S20 according to the customer's order; then, the pipe part 102 is assembled and welded to the main part 101 through step S30. Such a processing method not only greatly shortens the product delivery time, but also pipe parts 102 of different specifications can share the same main part 101, which greatly reduces the models generated during the product manufacturing process and reduces the inventory pressure caused by the customization of the pipe part 102.

[0093] Furthermore, the arrangement of the stainless steel sleeve 3 in the pipe connection part 102 allows a vertical connection of the same metal to be formed at the main pipe connection part (i.e., the receiving hole 21), so that high-strength self-fluxing girth welding or self-fluxing wire feeding girth welding can be used for welding at this place. During self-fluxing welding, the main pipe connection part and the stainless steel sleeve 3 made of stainless steel are partially melted and mutually dissolved to form a liquid weld. When the liquid weld solidifies, it crystallizes and grows by homogeneous or heteroepitaxial means starting from the fusion zone, and is connected to the unmelted parent materials (stainless steel receiving plate 2 and stainless steel sleeve 3) on both sides through metal bonds to form a self-fluxing girth weld 20. Compared with the brazing layer formed by metallurgical diffusion and mutual dissolution (especially the tin bronze brazing layer with loose metallographic structure), the self-fluxing girth weld 20 with the same composition as the parent material and connected by metal bonds is far superior to the traditional brazing layer in terms of connection strength and corrosion resistance. The excellent performance of the self-fluxing ring weld 20 means that the welding strength between the receiving hole 21 and the stainless steel sleeve 3 is no longer limited by the assembly depth of the receiving hole 21, thereby effectively solving the problems of low welding strength and easy leakage caused by insufficient brazing depth at the main pipe connection in the existing collecting pipe assembly.

[0094] Figures 1 to 3 A schematic diagram of a specific process flow of the liquid collecting tube assembly processing method provided in this embodiment. Figures 4 to 7 FIG. 1 is a schematic diagram of the structure of the corresponding liquid collecting pipe assembly. Figures 1 to 7 The processing method of the liquid collecting pipe assembly provided in this embodiment and the structure of the liquid collecting pipe assembly formed after the processing are introduced in detail.

[0095] In this embodiment, step S10 of processing the main component 101 includes:

[0096] Step S101 , processing a main pipe hole 11 on the peripheral wall of a stainless steel main pipe 1 .

[0097] Step S102 , the stainless steel receiving plate 2 is processed by a stamping process to be bent into a curved surface matching the outer peripheral wall of the main pipe 1 and a receiving hole 21 is formed.

[0098] Step S103, attach the stainless steel receiving plate 2 to the outer peripheral wall of the main pipe 1, and ensure that the receiving hole 21 on the stainless steel receiving plate 2 is substantially coaxial with the main pipe hole 11;

[0099] Step S104: brazing the stainless steel receiving plate 2 and the main pipe 1 at the receiving hole 21 by using a tunnel furnace to form a main pipe connection portion.

[0100] In this embodiment, a stainless steel receiving plate 2 is added to provide an assembly depth for the connecting pipe component 102. Specifically, the receiving hole 21 with a certain depth can limit the coaxiality of the front end 31 of the stainless steel sleeve in the circumferential direction to ensure that the axis of the stainless steel sleeve 3 basically coincides with the axis of the main pipe hole 11 after assembly. As mentioned above, the high-strength and corrosion-resistant self-melting ring weld 20 between the receiving hole 21 (i.e., the main pipe connection part) and the stainless steel sleeve 3 greatly reduces the influence of the assembly depth at the receiving hole 21 on the welding strength, so only one or two stainless steel receiving plates 2 are required on the outer peripheral wall of the main pipe 1. Preferably, the number of stainless steel receiving plates 2 is one; at this time, there is only an assembly gap between the stainless steel receiving plate 2 and the outer peripheral wall of the main pipe 1, the brazing path is very short, and the brazing material can quickly penetrate into the assembly gap to form a uniform and full brazing layer. Preferably, in step S104, oxygen-free copper brazing material with excellent welding fluidity is used for welding, and the oxygen-free copper brazing layer formed by the brazing material after welding is not only corrosion-resistant but also has high connection strength; further, the high-fluidity brazing material also provides conditions for the superposition of multiple stainless steel receiving plates. However, the present invention does not make any limitation to this. The larger contact area between the stainless steel receiving plate and the outer peripheral wall of the main pipe also allows other brazing materials to be used for welding between the two, such as tin bronze brazing material.

[0101] Further, such as Figure 2 and Figure 7 As shown, step S10 also includes step S103-1, using autogenous welding (such as argon arc welding or laser welding) or wire feeding welding to form a receiving plate reinforcement weld 30 between the edge of the stainless steel receiving plate 3 and the peripheral wall of the main pipe 1 to improve the assembly strength of the stainless steel receiving plate 2. Specifically, the receiving plate reinforcement weld 30 is a continuous circumferential weld or a plurality of local welds distributed at intervals. Afterwards, step S104 is performed to braze the stainless steel receiving plate 3 and the main pipe 1 using an oxygen-free copper tunnel furnace. However, the present invention does not make any limitation to this. In other embodiments, step S10 may not include step S103-1.

[0102] In this embodiment, when processing the receiving hole 21 in step S102, the receiving hole diameter Φ0 is set to be larger than the main pipe hole diameter Φ, and the diameter difference ΔΦ between the two is substantially close to or larger than the wall thickness of the front end 31 of the stainless steel sleeve. This setting enables the insertion depth of the front end 31 of the stainless steel sleeve to be axially limited based on the outer peripheral wall of the main pipe 1 when assembling the connecting pipe component 102 in step S30, without the need to additionally set an assembly limiting part to simplify the assembly process, such as Figure 6 and Figure 7 As shown. Further, in order to improve the assembly stability and connection strength of the stainless steel sleeve 3, the end surface of the front end 31 of the stainless steel sleeve can also be processed into a curved surface to fit the outer peripheral wall of the main pipe 1. Specifically, the end surface of the front end 31 of the stainless steel sleeve can be processed into a curved surface by laser cutting. However, the present invention does not make any limitation to this.

[0103] In other embodiments, when the receiving hole is opened in step S102, the receiving hole diameter Φ0 can be set to be substantially close to the main hole diameter Φ. Correspondingly, in step S30, when the main body component 101 and the connecting pipe component 102 are assembled and welded, the front end 31 of the stainless steel sleeve is inserted into the receiving hole 21 and the main hole 11. Figure 8 At this time, the receiving hole 21 and the main pipe hole 11 together provide the stainless steel sleeve 3 with assembly depth and coaxial positioning, and the outer peripheral wall of the stainless steel sleeve 3 is connected to the receiving hole 21 through the self-melting ring weld 20. Figure 8 In the embodiment, the end surface of the front end 31 of the stainless steel sleeve is substantially flush with the inner circumferential wall of the main pipe 1. However, the present invention does not limit this in any way. In other embodiments, the front end surface of the stainless steel sleeve 3 may extend into the inner cavity of the main pipe through the main pipe hole 11 (e.g. Fig. 9 This arrangement can satisfy the assembly length between the stainless steel sleeve 3 and the copper pipe 4 when the exposed length of the stainless steel sleeve 3 (the length exposed from the main pipe 1) is limited.

[0104] After the main body part 101 and the pipe part 102 are assembled, in step S30, the outer wall of the stainless steel sleeve 3 and the receiving hole 21 are welded by self-fluxing girth welding to form a self-fluxing girth weld 20. Specifically, arc welding (such as argon arc welding) can be used to form the self-fluxing girth weld 20. However, the present invention is not limited to this. In other embodiments, wire feeding can be performed on the basis of self-fluxing welding, and other metal elements can be added to form a self-fluxing wire feeding weld with better welding performance.

[0105] In the processing method of the collecting pipe assembly provided in this embodiment, the main pipe connection part and the stainless steel sleeve 3 in step S30 are self-melting welded with the same metal. This setting transfers the copper-steel dissimilar metal welding point on the collecting pipe assembly from the main pipe hole 11 with limited welding depth and vertical connection to the axial connection between the stainless steel sleeve 3 and the copper pipe 4 on the pipe part 102 with arbitrarily adjustable assembly depth. For the processing of the pipe part 102 (step S20), this embodiment uses self-melting welding or self-melting wire feeding welding to form a high-strength pipe weld 10 to ensure that the copper-steel dissimilar metal welding can meet the requirements of the refrigeration system in terms of connection strength, air tightness and corrosion resistance. However, the present invention does not make any limitation to this. The sleeve assembly length between the stainless steel sleeve 3 and the copper pipe 4 is freely adjustable, so that other embodiments of the present invention can increase the brazing area by increasing the sleeve assembly length, thereby improving the performance of the brazing layer between the two.

[0106] In this embodiment, the stainless steel sleeve 3 and the copper pipe 4 in the pipe member 102 are welded by arc welding to form a pipe weld. However, the present invention is not limited to this. In other embodiments, other self-melting welding methods, such as resistance welding, high-frequency welding, etc., can also be used between the stainless steel sleeve and the copper pipe.

[0107] Specifically, Figure 3 As shown, step S20 includes:

[0108] Step S201, insert the copper pipe 4 into the stainless steel sleeve 3, and ensure that the insertion depth L1 is greater than or equal to the larger of 0.05Φ0 and 2.5mm, where Φ0 is the aperture at the main pipe connection part, that is, the aperture of the receiving hole 21. Specifically, during assembly, the copper pipe 4 can be inserted into the stainless steel sleeve 3 from the end 32 of the stainless steel sleeve.

[0109] Step S202: using an arc welding torch to heat the end of the stainless steel sleeve 3, partially melting at least one end of the stainless steel sleeve 3 and the copper pipe 4 to form a molten pool.

[0110] Step S203, rotating the arc welding gun or the welding workpiece formed by the stainless steel sleeve 3 and the copper pipe 4 to form an arc weld (ie, pipe weld 10) in the circumferential direction.

[0111] In this embodiment, step S202 is to perform arc welding between the stainless steel sleeve end 32 and the copper pipe 4 to form a pipe weld 10. Figure 5 and Figure 7 However, the present invention does not limit this. In other embodiments, arc welding can be performed between the front end 31 of the stainless steel sleeve and the copper pipe 4 to form the pipe weld 10. The pipe component 102 formed after welding is as shown in FIG. Fig.10 Alternatively, arc welding is performed on both ends of the stainless steel sleeve 3 to form two pipe welds 10, as shown in FIG. Fig.11shown.

[0112] Furthermore, in other embodiments, after the molten pool is formed in step S202, a brazing material containing a third metal may be fed into the molten pool by wire feeding, and the performance of the pipe weld 10 formed after welding may be further improved by adding the third metal element, and the added metal element may be any one or more combinations of nickel, aluminum, and silicon. Specifically, when the added metal element is nickel, a nickel-based brazing material containing a nickel percentage greater than or equal to 60% is used.

[0113] Although this embodiment uses the self-fluxing welding or self-fluxing wire feeding welding between the stainless steel sleeve 3 and the copper pipe 4 as an example to illustrate. However, the present invention does not impose any limitation on this. In other embodiments, the stainless steel sleeve and the copper pipe can also be connected only by brazing, that is, only a brazing layer is formed in the assembly gap between the two, such as a tin bronze brazing layer or a brazing layer formed by welding a brazing material with a liquidus line below 920°C. At this time, the length of the brazing layer can be increased by adjusting the assembly depth of the stainless steel sleeve and the copper pipe, so that the connection strength and sealing can meet the requirements of the refrigeration system. Alternatively, self-fluxing welding and brazing are connected, as in Example 2

[0114] Corresponding to the above-mentioned processing method of the collecting tube assembly, Figure 5 As shown, this embodiment provides a liquid collecting pipe assembly, which includes a main body part 101 and a pipe connecting part 102. The main body part 101 includes a stainless steel main pipe 1, and a main pipe hole 11 is provided on the peripheral wall of the main pipe 1. A main pipe connecting part is formed at the edge of the main pipe hole 11, and the hole diameter Φ0 at the main pipe connecting part is greater than or equal to 18 mm and less than or equal to 65 mm. The pipe connecting part 102 includes a stainless steel sleeve 3 and a copper pipe 4, and the copper pipe 4 is inserted into the stainless steel sleeve 3 along the end of the stainless steel sleeve 3 and welded into the stainless steel sleeve 3. Among them, the front end 31 of the stainless steel sleeve in the pipe connecting part 102 is connected to the main pipe connecting part in the main body part 101 through a self-melting girth weld 20 or a self-melting wire feeding girth weld.

[0115] The liquid collecting pipe assembly provided in this embodiment includes a main body component 101 and a pipe connecting component 102 connected in a split manner. This arrangement not only greatly simplifies the processing procedures of the main body component 101 and improves the processing efficiency, but also improves its versatility, thereby greatly shortening the production cycle of the liquid collecting pipe assembly. Furthermore, the high-strength self-melting ring weld 20 between the main pipe connecting part and the stainless steel sleeve 3 makes the main body connecting part 12 with limited assembly depth no longer become a welding weak point, thereby well solving the problem of low connection strength and easy leakage caused by the limited assembly length at the pipe connecting hole of the existing water collecting pipe assembly.

[0116] In this embodiment, if Figure 5 , Figure 6 as well as Figure 7As shown, the main body 101 also includes a stainless steel receiving plate 2 welded to the outer peripheral wall of the main pipe 1, and a receiving hole 21 substantially coaxial with the main pipe hole 11 is formed on the stainless steel receiving plate 2, and a main pipe connecting portion is formed at the receiving hole 21 to connect the front end 31 of the stainless steel sleeve in the pipe connecting part 102. However, the present invention does not make any limitation to this. In other embodiments, the main body may also include only the main pipe. In this case, the front end of the stainless steel sleeve in the pipe connecting part is processed into a curved surface and then butted against the outer wall of the main pipe near the main pipe hole, and welded by self-melting girth welding or self-melting wire feeding girth welding. In this structure, the outer wall of the main pipe near the main pipe hole forms a main pipe connecting portion. Alternatively, the front end of the stainless steel sleeve is inserted into the main pipe hole and then welded, and a main pipe connecting portion is formed at the main pipe hole.

[0117] In this embodiment, a pipe weld 10 formed by autogenous welding or autogenous wire feeding welding is formed between the stainless steel sleeve 3 and the copper pipe 4. The pipe weld 10 is a continuous ring weld or a plurality of local welds distributed at intervals. The pipe weld 10 is an arc weld formed by arc welding and is formed between the stainless steel sleeve end 32 and the copper pipe 4. However, the present invention does not make any limitation to this. In other embodiments, the pipe weld 10 can also be formed between the stainless steel sleeve front end 31 and the copper pipe 4, such as Fig.10 Or, formed at both ends of the stainless steel sleeve 3, such as Fig.11 However, the present invention does not make any limitation to this. In the liquid collecting pipe assembly provided in this embodiment, the axial assembly depth of the stainless steel sleeve and the copper pipe can be adjusted so that the two can be connected by a brazing layer.

[0118] Fig.12 FIG. 1 is a schematic diagram of the structure of a liquid collecting pipe assembly provided by another embodiment of the present invention. In this structure, the liquid collecting pipe assembly includes a main body 101, a connecting pipe 102, and a branch pipe 103 welded to the connecting pipe 102. A plurality of branch pipes 1031 are also welded to the main pipe of each branch pipe 103. Fig.12 The branch / collector 103 in the embodiment may be a whole copper pipe or a liquid collecting pipe assembly provided in this embodiment. Fig. 12A At this time, the distribution / collection branch 103 includes a main body component 101', a plurality of connecting pipe components 102' welded to the peripheral wall of the main body component 101', and another connecting pipe component 102" welded to the axial end of the main body component 101'.

[0119] Correspondingly, this embodiment provides a heat exchanger including the above-mentioned manifold assembly, which is an evaporator or a condenser. Specifically, the manifold assembly can collect or distribute the refrigerant according to its installation occasion, and the refrigerant can also be a gaseous refrigerant, a liquid refrigerant or other refrigerant (such as chilled water).

[0120] Correspondingly, this embodiment also provides a refrigeration system including the above-mentioned collecting pipe assembly or heat exchanger, which can be a central air-conditioning module, a central air-conditioning water system, or a low-temperature heat pump system using carbon dioxide refrigerant and a cold storage system.

[0121] Implementation II

[0122] This embodiment is basically the same as the first embodiment and its variations, except that: in step S20, the connecting pipe component 102 is processed by combining autogenous welding and brazing.

[0123] Specifically, Fig.13 As shown, step S20 also includes:

[0124] Step S204 , after forming the pipe weld 10 by welding, the stainless steel sleeve 3 and the copper pipe 4 that are sleeve-assembled are brazed to form a pipe brazing layer 40 in the assembly gap between the stainless steel sleeve 3 and the copper pipe 4 .

[0125] In this embodiment, the stainless steel sleeve 3 and the copper pipe 4 are axially sleeved and assembled, and the assembly length between the two is freely adjustable. This arrangement allows the sleeve assembly length to be adjusted during brazing to increase the brazing area and improve the brazing performance. Specifically, tin bronze brazing material is used for tunnel furnace brazing of the stainless steel sleeve 3 and the copper pipe 4. However, the present invention does not make any limitation to this. In other embodiments, brazing material with a liquidus line below 920°C (such as copper-silver-phosphorus brazing material) can also be used for tunnel furnace brazing to avoid the reduction in the hardness of the copper pipe due to the increase in the grain size of the copper pipe after long-term high-temperature tunnel furnace brazing. Although this embodiment is described by taking the tunnel furnace brazing of stainless steel sleeves and copper pipes as an example. However, the present invention does not make any limitation to this. In other embodiments, other brazing methods such as flame brazing can also be used to weld the stainless steel sleeve and the copper pipe to form a pipe brazing layer.

[0126] In this embodiment, the connecting pipe weld 10 and the connecting pipe brazing layer 40 form double protection in terms of connection strength and sealing, which not only greatly improves the connection strength and pressure resistance after copper-steel dissimilar metal welding; at the same time, the connecting pipe weld 10 located at the end 32 of the stainless steel sleeve can isolate and protect the connecting pipe brazing layer 40 to avoid corrosion of the connecting pipe brazing layer 40 by external harmful substances and has good corrosion resistance.

[0127] In this embodiment, the pipe weld 10 is a continuous circumferential weld for illustration. However, the present invention does not limit this. The excellent performance of the pipe brazing layer 40 allows the pipe weld 10 to be a plurality of local welds distributed at intervals in other embodiments; or, only the pipe brazing layer 40 is used to weld the stainless steel sleeve and the copper pipe without providing a pipe weld.

[0128] In this embodiment, in order to further increase the penetration path of the pipe brazing layer 40, step S30 further opens a vent hole 41 on the pipe wall of the copper pipe 4 and ensures that the vent hole 41 is inserted into the stainless steel sleeve 3, that is, the vent hole 41 is located on the peripheral wall of the copper pipe 4 in the sleeve area. During brazing, the gas in the assembly gap between the stainless steel sleeve 3 and the copper pipe 4 is discharged to the inner cavity of the copper pipe 4 through the vent hole 41, reducing the resistance in the assembly gap to increase the penetration path of the brazing material.

[0129] Fig.14 FIG. 1 is a partial schematic diagram of a liquid collecting pipe assembly processed by the liquid collecting pipe assembly processing method provided in this embodiment. Fig.15 for Fig.14 Schematic diagram of the structure of the copper pipe 4. Specifically, two rows of exhaust holes distributed along the axial direction are opened on the pipe wall of the copper pipe 4 in the sleeve area, and each row includes a plurality of exhaust holes 41 distributed along the circumferential direction. However, the present invention does not make any limitation to this. In other embodiments, the copper pipe may also be provided with a row (such as Fig.16 As shown) or more than three rows of exhaust holes, or other irregular arrangements. Further, in other embodiments, exhaust holes can also be opened on the stainless steel sleeve wall in the sleeve area; in this case, the pipe weld is preferably arranged on the stainless steel sleeve peripheral wall near the copper pipe insertion end.

[0130] Regarding the processing of the main body component 101, this embodiment is basically the same as the first embodiment and its variations, and will not be described herein in detail.

[0131] Embodiment 3

[0132] This embodiment is basically the same as the first embodiment and its variations, except that: in this embodiment, Figures 17 to 20 As shown, no stainless steel receiving plate is provided on the main body component 101 , and the main pipe connecting portion is a flange portion 111 .

[0133] Specifically, when the main body is processed in step S10 , each main pipe hole 11 is flanging-processed to form a flanging portion 111 , and a main pipe connecting portion is formed at the flanging portion 111 .

[0134] When the welding main body component and the pipe component are assembled in step S30: the front end 31 of the stainless steel sleeve is inserted into the flange portion 111, and the stainless steel sleeve 3 is coaxially positioned based on the flange portion 111; then, the outer wall of the stainless steel sleeve 3 and the flange portion 111 are welded by self-fluxing girth welding to form a self-fluxing girth weld 20. However, the present invention is not limited to this. In other embodiments, self-fluxing wire feeding girth welding can also be used to form a self-fluxing wire feeding girth weld containing a third metal element to further improve the weld performance.

[0135] In addition, in other embodiments, the stainless steel sleeve can also be butt-connected to the flange portion after being axially positioned by a tool, and then self-fluxing girth welding or self-fluxing wire feeding girth welding can be performed.

[0136] Regarding the processing of the connecting pipe component 102, this embodiment is basically the same as the first and second embodiments, and will not be described in detail here.

[0137] Embodiment 4

[0138] This embodiment is basically the same as the first embodiment and its variations, except that: in the processing method of the liquid collecting pipe assembly provided in this embodiment, the position of the main pipe connecting part on the main body component 101 is different. Fig. 22 and Fig.23 As shown, in this embodiment, the main pipe connection portion on the main body component 101 is located at the axial end of the main pipe 1 , and the axial end of the main pipe 1 is connected to the external system pipeline through the connecting pipe component 102 .

[0139] In this embodiment, if Fig.21 As shown, the processing method of the collecting tube assembly includes:

[0140] Step S10 ′: main body component processing: a main pipe connecting portion is provided at the axial end of the stainless steel main pipe 1 , and the hole diameter at the main pipe connecting portion is greater than or equal to 18 mm.

[0141] Step S20: Processing the pipe component: inserting the copper pipe into the stainless steel sleeve, and welding the two together to form the pipe component;

[0142] Step S30': assemble and weld the main body component and the pipe component: assemble the front end of the stainless steel sleeve in the pipe component to the main pipe connection portion on the main body component, and weld the assembly of the two by self-fluxing girth welding or self-fluxing wire feeding girth welding.

[0143] Correspondingly, such as Fig.21 As shown, the liquid collecting pipe assembly provided in this embodiment includes a main body part 101 and a pipe connecting part 102. The main body part 101 includes a stainless steel main pipe 1, and the axial end of the main pipe 1 is provided with a main pipe connecting part and the aperture at the main pipe connecting part is greater than or equal to 18 mm. The pipe connecting part 102 includes a stainless steel sleeve 3 and a copper pipe 4. The copper pipe 4 is inserted into and welded into the stainless steel sleeve 3. Among them, the front end 31 of the stainless steel sleeve in the pipe connecting part 102 is connected to the main pipe connecting part in the main body part 101 through a self-melting girth weld or a self-melting wire feeding girth weld.

[0144] In this embodiment, the main pipe shaft end is expanded to form an expanded connection section 13, and the expanded connection section 13 forms a main pipe connection portion. However, the present invention is not limited to this. In other embodiments, the main pipe shaft end may be narrowed to form a main pipe connection portion; or, the shaft end of the main pipe may be directly used as the main pipe connection portion without processing.

[0145] Similar to the first embodiment, in the liquid collecting pipe assembly processing method and the liquid collecting pipe assembly provided in this embodiment, the split structure of the main body component 101 and the connecting pipe component 102 allows the two to be processed independently, and the main body component 101 does not need to be welded following the connecting pipe component 102, which greatly reduces the welding steps experienced by the main body component 101 and thus improves the welding efficiency; at the same time, this arrangement also allows the main body component 101 to match connecting pipe components 102 of different specifications and has good versatility.

[0146] Although this embodiment is described by taking the example that the main pipe connection part is formed at the main pipe shaft end. However, the present invention does not limit this. In other embodiments, the main pipe connection part is formed on both the main pipe hole on the main pipe peripheral wall and the main pipe shaft end, that is, the combination of the first embodiment and this embodiment. In this case, the manifold assembly will include a pipe connection part welded to the main pipe hole and another pipe connection part welded to the main pipe shaft end.

[0147] Embodiment 5

[0148] As described in the first embodiment, the arrangement of the stainless steel sleeve 3 enables the processing of the pipe part 102 composed of the copper pipe 4 and the stainless steel sleeve 3 to be independent of the large-sized main body part 101. This arrangement can not only reduce the welding process experienced by the main body part 101 and improve the welding efficiency, but also make the welding assembly of the copper pipe 4 more flexible. When the copper pipe 4 and the stainless steel sleeve 3 are connected by the self-fluxing pipe weld 10, the copper pipe 4 does not need to undergo long-term high-temperature furnace brazing, so its grain size is not affected by welding and has excellent strength, pressure resistance and ductility.

[0149] Based on the same idea, Fig.25 The embodiment shown provides another collecting pipe assembly, which includes a main body part 101" and a copper pipe 4. The main body part 101" includes a stainless steel main pipe 1, a receiving plate 2 and a copper connecting sleeve 3'. A main pipe hole 11 is opened on the peripheral wall of the main pipe 1. The receiving plate 2 is welded to the outer peripheral wall of the main pipe 1. A receiving hole 21 is formed on the receiving plate 2, which is substantially coaxial with the main pipe hole 11, and the hole diameter Φ0 of the receiving hole 21 is greater than or equal to 18 mm and less than or equal to 65 mm. The front end of the copper connecting sleeve 3' is brazed and connected to the receiving hole 21. The copper pipe 4 is inserted into the copper connecting sleeve 3' of the main body part 101", and a pipe weld and / or a pipe brazing layer 40' formed by non-furnace brazing is formed between the copper connecting sleeve 3' and the copper pipe 4. The pipe weld is a continuous ring weld or a plurality of spaced local welds formed by self-fluxing welding or self-fluxing wire feeding welding.

[0150] In this embodiment, the diameter of the main pipe hole 11 is smaller than the diameter of the receiving hole 21, and the front end of the copper connection sleeve 3' extends through the receiving hole 21 and abuts against the outer peripheral wall of the main pipe 1 attached to the main pipe hole 11. The main pipe 1, the receiving plate 2 and the copper connection sleeve 3' are integrally welded by furnace brazing, the peripheral wall of the copper connection sleeve 3' is brazed and connected to the receiving hole 21, and the front end surface of the copper connection sleeve 3' is brazed to the outer peripheral wall of the main pipe 1. In this structure, the outer peripheral wall of the main pipe 1 and the receiving hole 21 jointly provide the copper connection sleeve 3' with a welding depth. However, the present invention does not make any limitation to this. In other embodiments, the diameter of the receiving hole can also be set to be basically close to the diameter of the main pipe hole, and the front end of the copper connection sleeve is inserted into the main pipe hole through the receiving hole, and the receiving hole and the main pipe hole jointly provide the copper connection sleeve with a welding depth to ensure that its welding strength meets the requirements of the refrigeration system. In this embodiment, the receiving hole is a through hole. However, the present invention does not make any limitation to this. In other embodiments, the receiving hole may also be a flanged hole to further increase the welding depth of the copper connecting sleeve.

[0151] In the collecting pipe assembly provided in the present embodiment, the arrangement of the copper connecting sleeve 3' in the main body component 101" enables the same metal welding to be formed between it and the copper connecting pipe 4, which provides conditions for the independent welding of the copper connecting pipe 4 and its welding method is more flexible and diverse. Specifically, in the present embodiment, the copper connecting sleeve 3' and the copper connecting pipe 4 are welded by flame brazing to form a connecting pipe brazing layer 40'. Compared with furnace brazing, the welding temperature of flame brazing is lower and the welding heating time is short. The grain size of the copper connecting pipe 4 will not become coarse due to high-temperature and long-term welding. Therefore, after welding, the copper connecting pipe 4 still has excellent strength, pressure resistance and ductility, and can be well applied not only to air-conditioning systems with relatively low pressure, but also to high-pressure refrigeration systems, such as low-temperature heat pump systems or cold storage systems using carbon dioxide refrigerant.

[0152] In this embodiment, although the grain size of the copper connection sleeve 3' will become larger after furnace brazing and affect its performance, since its length is much shorter than the copper pipe 4, the impact of furnace brazing on its strength and pressure resistance is significantly smaller than that of the copper pipe 4. Further, during assembly, the high-strength copper pipe 4 is inserted into the copper connection sleeve 3' and the insertion end of the copper pipe 4 extends over the receiving hole 21. The two are under pressure together at the overlapping part of the sleeve, and the copper connection sleeve 3' is not under pressure alone at any place, thereby greatly improving the strength and pressure resistance. Further, this arrangement allows the length of the copper connection sleeve 3' to be shorter when meeting the welding assembly requirements, so it has higher strength.

[0153] Although the present embodiment is described by flame brazing as an example. However, the present invention does not impose any limitation on this. In other embodiments, other brazing methods such as high-frequency brazing or laser brazing may also be used. Although the present embodiment is described by taking the example of a pipe brazing layer 40' formed between the copper connecting sleeve 3' and the copper pipe 4. However, the present invention does not impose any limitation on this. In other embodiments, the two may also be connected by a pipe weld (such as a pipe self-melting ring weld formed by argon arc welding or argon arc wire feeding welding); or, a pipe weld and a pipe brazing layer may be combined; in this case, the pipe weld is a ring weld or a local weld.

[0154] In this embodiment, the receiving plate 2 is a stainless steel receiving plate. However, the present invention does not make any limitation to this. In other embodiments, the receiving plate can also be a copper receiving plate.

[0155] Corresponding to the above-mentioned collecting pipe assembly, Fig.24 As shown, this embodiment also provides a processing method for the liquid collecting pipe assembly, and the steps are as follows:

[0156] Step S10": Processing of the main body component 101":

[0157] Step S101 ”, processing a main pipe hole 11 on the peripheral wall of the stainless steel main pipe 1 .

[0158] Step S102”, process the receiving plate 2 and attach the receiving plate 2 to the outer peripheral wall of the main pipe 1, and ensure that the receiving hole 21 on the receiving plate 2 is substantially coaxial with the main pipe hole 11 and the hole diameter of the receiving hole 21 is Φ0

[0159] Greater than or equal to 18mm and less than or equal to 65mm;

[0160] Step S103”, processing the copper connection sleeve 3’ and inserting the front end of the copper connection sleeve 3’ into the receiving hole 21;

[0162] Step S104”, using furnace brazing to weld the main pipe 1, the receiving plate 2 and the copper connecting sleeve 3’ in an integrated manner;

[0163] Step S20": Assembling and welding the copper pipe 4: insert the copper pipe 4 into the copper connecting sleeve 3' and weld the two together by using one or more combinations of self-fluxing welding, self-fluxing wire feeding welding, flame brazing or high-frequency brazing.

[0164] In summary, the processing method of the collecting pipe assembly provided by the present invention divides the collecting pipe assembly into a main body component and a connecting pipe component that can be processed independently. After the two components are processed independently, they can be formed through a welding process. This setting makes the large-sized main body component not affected by the assembly and welding of the connecting pipe component, reduces the welding process of the large-sized main body component to reduce the processing cost and improve the processing efficiency; at the same time, the split processing of the main body component also makes it possible to match connecting pipe components of different structures or specifications and has good versatility. Furthermore, this setting also makes the copper connecting pipe not affected by the welding assembly of the main body component, and its welding method is more flexible and has better strength and ductility after welding.

[0165] In the pipe connection part, the setting of the stainless steel sleeve enables the same metal welding to be formed at the main pipe connection part with limited welding depth, which provides conditions for the use of self-melting girth welding or self-melting wire feeding girth welding to form a high-strength and dense joint weld. The weld formed by self-melting welding is formed by the melting of the base material and the mutual dissolution of the elements and then recrystallization in a homogeneous epitaxial manner. Its connection strength is much higher than the tin bronze brazing layer with loose metallographic structure formed by metallurgical diffusion and mutual dissolution. The excellent welding performance greatly reduces the influence of welding depth on welding strength, thereby effectively solving the problems of low welding strength and easy leakage caused by insufficient brazing depth at the main pipe connection of the existing collecting pipe assembly. In addition, the setting of the stainless steel sleeve also transfers the copper-steel dissimilar metal welding to the axial connection of the stainless steel sleeve and the copper pipe connection with arbitrarily adjustable assembly depth; the dissimilar metal welding between the two can be carried out by a combination of brazing and / or self-melting welding to ensure that the connection strength, air tightness and corrosion resistance of the welding point can well meet the requirements of the refrigeration system.

[0166] Although the present invention has been disclosed as above by the preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection required by the claims.

Claims

1. A method for processing a liquid collecting pipe assembly, characterized in that: The collecting pipe assembly comprises a main body component and a connecting pipe component, and the processing method comprises: Processing of the main part: a main pipe hole is processed on the peripheral wall of the stainless steel main pipe, and a main pipe connection part for welding the pipe part is formed at each main pipe hole to form the main part; the hole diameter Φ0 at the main pipe connection part is greater than or equal to 18 mm and less than or equal to 65 mm; Processing of pipe parts: insert the copper pipe into the stainless steel sleeve, and weld the two to form the pipe parts; Assemble and weld the main body component and the connecting pipe component: Assemble the front end of the stainless steel sleeve in the connecting pipe component to the main pipe connecting portion on the main body component, and use self-fluxing girth welding or self-fluxing wire feeding girth welding for welding at the assembly point of the two.

2. The method for processing a manifold assembly according to claim 1, characterized in that: The processing of the pipe parts also includes: When inserting the copper pipe into the stainless steel sleeve, ensure that the insertion depth L1 is greater than or equal to the larger of 0.05Φ0 and 2.5mm, where Φ0 is the hole diameter at the main pipe connection part; The stainless steel sleeve and the copper pipe are welded by self-fluxing welding or wire feeding welding to form a pipe weld, wherein the pipe weld is a continuous circumferential weld or a plurality of local welds distributed at intervals.

3. The method for processing a manifold assembly according to claim 2, characterized in that: The pipe weld is an arc weld, and the process of welding the pipe weld includes: Using an arc welding torch to heat the end of the stainless steel sleeve, partially melting at least one end of the stainless steel sleeve and the copper pipe to form a molten pool; The arc welding gun or the welding workpiece formed by the stainless steel sleeve and the copper pipe is rotated to form an arc weld in the circumferential direction.

4. The method for processing a manifold assembly according to claim 3, characterized in that: After the molten pool is formed, a brazing material containing a third metal is fed into the molten pool, and the brazing material is melted based on the heat of the arc to form a pipe weld containing the third metal element.

5. The method for processing a manifold assembly according to claim 1 or 2, characterized in that: The steps of processing the take-over parts also include: The stainless steel sleeve and the copper pipe are assembled by brazing, and a pipe brazing layer is formed in the assembly gap between the stainless steel sleeve and the copper pipe; Alternatively, the stainless steel sleeve and the copper pipe are welded by self-fluxing welding or wire feeding welding to form a pipe weld; then the sleeve-assembled stainless steel sleeve and the copper pipe are brazed to form a pipe brazing layer in the assembly gap between the stainless steel sleeve and the copper pipe.

6. The method for processing a manifold assembly according to claim 5, characterized in that: The stainless steel sleeve and the copper pipe are brazed with tin bronze brazing material or brazing material with a liquidus temperature lower than 920°C to form a pipe brazing layer.

7. The method for processing a manifold assembly according to claim 5, characterized in that: When processing the pipe part, a vent hole is opened on the pipe wall of the copper pipe and / or the stainless steel sleeve, and during the sleeve assembly, the vent hole is ensured to be located at the overlapping part of the copper pipe and the stainless steel sleeve; When the stainless steel sleeve and the copper pipe are brazed together, the gas in the assembly gap between the stainless steel sleeve and the copper pipe is discharged from the exhaust hole.

8. The method for processing a manifold assembly according to claim 1, characterized in that: The processing method also includes: When processing the main parts: fit the stainless steel receiving plate to the outer peripheral wall of the main pipe, and ensure that the receiving hole on the stainless steel receiving plate is basically coaxial with the main pipe hole; use a tunnel furnace to braze the stainless steel receiving plate and the main pipe, and form a main pipe connection part at the receiving hole; When assembling and welding the main body component and the connecting pipe component: the front end of the stainless steel sleeve is inserted into the receiving hole, and the stainless steel sleeve is coaxially positioned based on the receiving hole; then, the outer wall of the stainless steel sleeve and the receiving hole are welded by self-fluxing girth welding or self-fluxing wire feeding girth welding.

9. The method for processing a manifold assembly according to claim 8, characterized in that: The processing method also includes: When processing the main body component: the diameter of the receiving hole is set to be larger than the diameter of the main pipe hole, and the diameter difference between the two is basically close to or larger than the wall thickness of the front end of the stainless steel sleeve; when assembling and welding the main body component and the connecting pipe component: the front end of the stainless steel sleeve is inserted into the receiving hole until the front end surface of the stainless steel sleeve abuts against the outer peripheral wall of the main pipe, and the insertion depth of the stainless steel sleeve is limited based on the outer peripheral wall of the main pipe; Alternatively, when processing the main body component: the diameter of the receiving hole is set to be basically close to the diameter of the main pipe hole; when assembling and welding the main body component and the connecting pipe component, the front end of the stainless steel sleeve is inserted into the receiving hole and the main pipe hole.

10. The method for processing a manifold assembly according to claim 1, characterized in that: The processing method also includes: When processing the main body component: each main pipe hole is flanging-processed to form a flanging portion, and a main pipe connecting portion is formed at the flanging portion; When assembling and welding the main body component and the connecting pipe component: the front end of the stainless steel sleeve is inserted into the flange part, and the stainless steel sleeve is coaxially positioned based on the flange part; then, the outer wall of the stainless steel sleeve and the flange part are welded by self-fluxing girth welding or self-fluxing wire feeding girth welding.

11. The method for processing a manifold assembly according to claim 1, characterized in that: When assembling and welding the main body component and the connecting pipe component, the front end of the stainless steel sleeve in the connecting pipe component is butt-jointed and assembled to the main pipe connection part on the main body component; then, the butt joint is welded by self-fluxing girth welding or self-fluxing wire feeding girth welding.

12. A method for processing a liquid collecting pipe assembly, characterized in that: The collecting pipe assembly comprises a main body component and a connecting pipe component, and the processing method comprises: Processing of main parts: a main pipe connection part is set at the shaft end of the stainless steel main pipe, and the hole diameter at the main pipe connection part is greater than or equal to 18mm; Processing of pipe parts: insert the copper pipe into the stainless steel sleeve, and weld the two to form the pipe parts; Assemble and weld the main body component and the connecting pipe component: Assemble the front end of the stainless steel sleeve in the connecting pipe component to the main pipe connecting portion on the main body component, and use self-fluxing girth welding or self-fluxing wire feeding girth welding for welding at the assembly point of the two.

13. A method for processing a liquid collecting pipe assembly, characterized in that: The collecting pipe assembly comprises a main body component and a connecting pipe component, and the processing method comprises: Main parts processing: A main pipe hole is machined on the peripheral wall of the stainless steel main pipe; Process the receiving plate and fit it to the outer wall of the main pipe, and ensure that the receiving hole on the receiving plate is basically coaxial with the main pipe hole and the hole diameter Φ0 at the receiving hole is greater than or equal to 18mm and less than or equal to 65mm; Processing the copper connecting sleeve and inserting the front end of the copper connecting sleeve into the receiving hole; The main body is formed by furnace brazing of the integral welding main pipe, the receiving plate and the copper connecting sleeve; Copper pipe assembly welding: insert the copper pipe into the copper connecting sleeve of the main component and weld the two together by one or more combinations of self-fluxing welding, self-fluxing wire feeding welding, flame brazing or high-frequency brazing.

14. A liquid collecting pipe assembly, characterized in that: Processed by the method according to claim 1, the collecting pipe assembly comprises: The main body part comprises a stainless steel main pipe, and a main pipe hole is provided on the peripheral wall of the main pipe, a main pipe connecting part is formed at the edge of the main pipe hole, and the hole diameter Φ0 of the main pipe connecting part is greater than or equal to 18 mm and less than or equal to 65 mm; A pipe connecting member, comprising a stainless steel sleeve and a copper pipe connecting member, wherein the copper pipe connecting member is inserted into and welded into the stainless steel sleeve; The front end of the stainless steel sleeve in the connecting pipe component is connected to the main pipe connecting part in the main body component through a self-melting ring weld or a self-melting wire feeding ring weld.

15. The manifold assembly according to claim 14, characterized in that: The main body component also includes a stainless steel receiving plate welded to the outer peripheral wall of the main pipe, the stainless steel receiving plate is formed with a receiving hole substantially coaxial with the main pipe hole, and a main pipe connecting portion is formed at the receiving hole to weld the front end of the stainless steel sleeve in the receiving pipe component.

16. The header assembly according to claim 14, characterized in that: The main pipe connecting portion is a flanged portion formed at the edge of the main pipe hole, and the flanged portion is welded to the front end of the stainless steel sleeve in the pipe connecting component.

17. The manifold assembly according to claim 14, characterized in that: The front end of the stainless steel sleeve in the pipe connection part is sleeve-fitted or butt-fitted to the main pipe connection part, and the assembly part of the two is welded to form a self-fluxing ring weld or a self-fluxing wire feeding ring weld.

18. The manifold assembly according to claim 14, wherein: In the pipe component, a pipe weld formed by self-fluxing welding or self-fluxing wire feeding welding is formed between the stainless steel sleeve and the copper pipe. The pipe weld is a continuous ring weld or a plurality of local welds distributed at intervals.

19. The manifold assembly according to claim 18, wherein: The pipe weld is an arc weld formed by arc welding and is formed between at least one end of the stainless steel sleeve and the copper pipe.

20. The header assembly according to claim 14, wherein: In the connecting pipe component, a brazing layer formed by welding with tin bronze brazing material or brazing material with a liquidus line lower than 920° C. is formed in the assembly gap between the stainless steel sleeve and the copper connecting pipe.

21. The manifold assembly according to claim 20, characterized in that At the overlapping part of the stainless steel sleeve and the copper pipe, an exhaust hole for exhausting gas is formed on the pipe wall of the copper pipe and / or the stainless steel sleeve.

22. A liquid collecting pipe assembly, characterized in that: Processed by the method of claim 12, the manifold assembly comprises: The main body component comprises a stainless steel main pipe, the main pipe shaft end is provided with a main pipe connecting portion, and the hole diameter of the main pipe connecting portion is greater than or equal to 18 mm; A pipe connecting member, comprising a stainless steel sleeve and a copper pipe connecting member, wherein the copper pipe connecting member is inserted into and welded into the stainless steel sleeve; The front end of the stainless steel sleeve in the connecting pipe component is connected to the main pipe connecting part in the main body component through a self-melting ring weld or a self-melting wire feeding ring weld.

23. A liquid collecting pipe assembly, characterized in that: Processed by the method of claim 13, the manifold assembly comprises: The main body comprises a stainless steel main pipe, a receiving plate and a copper connecting sleeve. A main pipe hole is formed on the peripheral wall of the main pipe. The receiving plate is welded to the outer peripheral wall of the main pipe. A receiving hole substantially coaxial with the main pipe hole is formed on the receiving plate and the hole diameter Φ0 of the receiving hole is greater than or equal to 18 mm and less than or equal to 65 mm. The front end of the copper connecting sleeve is brazed and connected to the receiving hole. The copper pipe is inserted into the copper connecting sleeve of the main component. A self-fluxing pipe weld and / or a pipe brazing layer formed by non-furnace brazing is formed between the copper connecting sleeve and the copper pipe. The pipe weld is a continuous ring weld or a plurality of spaced local welds formed by self-fluxing welding or self-fluxing wire feeding welding.

24. A heat exchanger, characterized in that: The invention comprises the liquid collecting pipe assembly as described in claims 13 to 23.

25. A refrigeration system, characterized in that: It comprises the collecting pipe assembly according to claims 13 to 23; and / or the heat exchanger according to claim 24.

Images