Bushing, pipeline assembly and manufacturing method of pipeline assembly

Abstract

The invention discloses a lining, a pipeline assembly and a manufacturing method of the pipeline assembly, the lining is used for a refrigerating system, the lining comprises a slotting part and a plurality of grooves, the slotting part comprises a gap, and the extending direction of the grooves is the same as the extending direction of the gap. The gap provides a certain deformation space for radial shrinkage of the bushing, the press-fitting resistance of the bushing is reduced, press-fitting is easier, the flowing directions of welding flux are consistent during welding, the welding flux can flow more smoothly, the welding seam quality can be further relatively improved, and the welding quality is improved.

Description

[Technical field]

[0001] The invention relates to a refrigeration system, and in particular to a bushing, a pipeline assembly and a method for manufacturing the pipeline assembly. [Background technology]

[0002] The refrigeration parts in the air-conditioning system need to be connected to the system pipes. The pipes in the air-conditioning system are generally copper pipes. In order to facilitate the connection with the copper pipes in the system, bushings are generally provided for transition. In the related technology, seamless bushings are used for bushings. Interference fit is generally used when bushings and refrigeration parts are matched. The amount of interference fit needs to be limited. When the amount of interference fit is large, it will lead to difficulties in press fitting, and it is also easy to damage the solder flow path, making it difficult for the solder to flow, affecting the welding strength. [Summary of the invention]

[0003] The present invention provides a bushing with small press-fitting resistance and convenient press-fitting. The specific technical scheme is as follows:

[0004] A bushing is used in a refrigeration system. The bushing comprises a slotted portion and a plurality of grooves. The slotted portion comprises a slit. The extending direction of the groove is the same as the extending direction of the slit.

[0005] The bushing provided by the present invention has the beneficial effect that: when the bushing is pressed, the gap provides a certain deformation space for the bushing during radial contraction, thereby reducing the bushing press-fitting resistance and making press-fitting easier; in addition, the gaps and grooves on the bushing are both flow channels for the solder, and the gaps and grooves extend in the same direction, which relatively reduces the risk of solder accumulation, allowing the solder to flow smoothly, the weld to be fuller, and the strength of the welding part to be better.

[0006] The present invention also provides a pipeline assembly, and the specific technical solution is as follows:

[0007] A pipe assembly is used in a refrigeration system. The pipe assembly includes a bushing and a first pipe fitting. The first pipe fitting includes a connecting end. At least a portion of the outer wall of the bushing is welded to at least a portion of the inner wall of the connecting end. The inner wall of the connecting end is provided with a step portion. An accommodating portion is formed between the step portion and the end of the bushing located inside the connecting end. The accommodating portion is provided with a first welding ring. The first welding ring melts and flows to at least a portion of the gap and at least a portion of the groove.

[0008] The pipeline assembly provided by the present invention has the beneficial effect that when the bushing is connected to the first pipe fitting, the gap provides a certain deformation space for the bushing during radial contraction, thereby reducing the bushing press-fitting resistance and making press-fitting easier. In addition, the groove and the gap of the bushing extend in the same direction, so that during welding, the solder flows more smoothly, which can further improve the connection strength between the bushing and the first pipe fitting.

[0009] The present invention also provides a method for manufacturing a pipeline assembly, wherein the pipeline assembly comprises a first pipe member and a bushing, wherein the first pipe member comprises a connecting end portion, and the manufacturing method comprises the following steps:

[0010] Providing a plate-like material as a manufacturing base material for the bushing;

[0011] Rolling the substrate into a cylindrical substrate with opposite end faces, so that two parallel end faces of the substrate face each other and a gap is formed between the two end faces;

[0012] Machining the outer wall of the cylindrical substrate to form a groove on the surface thereof, wherein the groove and the slit extend in the same direction;

[0013] Cutting and flanging the substrate with the groove to obtain the bushing;

[0014] The first pipe and solder are provided, the first pipe, the solder and the bushing are assembled, the first pipe and the bushing are connected by welding, and the solder melts and flows to at least a portion of the gap and at least a portion of the groove.

[0015] The manufacturing method of the pipeline assembly provided by the present invention has the following beneficial effects: when manufacturing the bushing, machining is performed first and then blanking is performed, which can improve production efficiency compared with blanking first and then wire drawing in the related technology; when press-fitting the bushing, the gap provides a certain deformation space for the bushing during radial contraction, which can reduce the bushing press-fitting resistance and make press-fitting easier; in addition, the groove and the gap of the bushing extend in the same direction, so that during welding, the solder flows more smoothly, which can further improve the connection strength between the bushing and the first pipe fitting.

Brief Description of the Drawings

[0016] Figure 1 A perspective view of the bushing is shown;

[0017] Figure 2 A front view of the bushing is shown;

[0018] Figure 3 A top view of the bushing is shown;

[0019] Figure 4 A second embodiment of the bushing is shown;

[0020] Figure 5 A perspective view of a first embodiment of a pipeline assembly is shown;

[0021] Figure 6 Shows Figure 5 A cross-sectional view of

[0022] Figure 7 Shows Figure 6 A magnified image of

[0023] Figure 8 A cross-sectional view of a second embodiment of a pipeline assembly is shown;

[0024] 100. Pipeline assembly; 1. First pipe fitting; 2. Bushing; 11. Connecting end; 27. Slit portion; 20. Groove; 271. Gap; 21. First end surface; 22. Second end surface; 23. Inner wall surface; 24. Outer wall surface; 272. First slit surface; 273. Second slit surface; 3. Body; 25. First flange portion; 26. Second flange portion; 274. First slit portion; 2741. First gap; 275. Second slit portion; 2751. Second gap; 34. Guide surface; 31. First groove; 251. Second groove; 111. Step portion; 4. Second pipe fitting; [Specific implementation method]

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts shown in the drawings relative to each other, just for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0027] The refrigeration parts in the air-conditioning system need to be connected to the system pipes. The pipes in the air-conditioning system are generally copper pipes. In order to facilitate the connection with the copper pipes in the system, bushings are generally provided for transfer. The refrigeration parts described in the present application may be silencers, liquid reservoirs, oil separators, filters, pipe fittings, etc.; in the related art, the bushings used are seamless bushings, and the bushings and refrigeration parts are generally fitted with interference fit, and the amount of interference fit needs to be limited. When the amount of interference fit is large, it will lead to difficulties in press fitting, and it is also easy to damage the solder flow channel, making it difficult for the solder to flow, affecting the welding strength.

[0028] To solve the above problems, see Figures 1 to 8The present application provides a bushing 2 for a refrigeration system, wherein the bushing 2 is provided with a slit portion 27 and a plurality of grooves 20, wherein the slit portion 27 includes a slit 271, and the extending direction of the groove 20 is the same as the extending direction of the slit 271. Specifically, along the axial direction of the bushing 2, the slit 271 penetrates both end faces of the bushing 2, and along the radial direction of the bushing 2, the slit 271 penetrates the side wall of the bushing 2. When the bushing 2 is pressed, the slit 271 provides a certain deformation space for the bushing 2 during radial contraction, which can reduce the pressing resistance of the bushing 2, making the pressing easier, and also reduce the possibility of damaging the solder flow channel, so that the solder flow is relatively easier and not easy to accumulate; in addition, the extending direction of the groove 20 provided on the bushing 2 is the same as the extending direction of the slit 271, and during welding, the solder flows in the same direction, which can make the solder flow smoother, reduce the risk of solder leakage or accumulation, and further improve the weld quality and thus improve the welding quality.

[0029] Specifically, the bushing 2 can be made of a pipe or a plate. The material of the bushing 2 can be copper, steel, aluminum, etc., which needs to be determined according to the system pipe and the use environment. Currently, the material of the system pipe is mostly copper, and the corresponding bushing 2 material is preferably copper. The bushing 2 is a cylindrical body with a slightly C-shaped cross-section around a central axis. The slit portion 27 also includes a first slit surface 272 and a second slit surface 273. The end surfaces of the bushing 2 are respectively a first end surface 21 and a second end surface 22. The first end surface 21 and the second end surface 22 are arranged at both ends of the bushing 2 and surround the central axis of the bushing 2. The first slit surface 272 connects the first end surface 21 and the second end surface 22, and the second slit surface 273 connects the first end surface 21 and the second end surface 22. Along the axial direction of the bushing 2, the gap 271 passes through the first end surface 21 and the second end surface. 22; the side wall portion of the bushing 2 includes an inner wall surface 23 and an outer wall surface 24; the first slit surface 272 connects the inner wall surface 23 and the outer wall surface 24, the second slit surface 273 connects the inner wall surface 23 and the outer wall surface 24, and along the radial direction of the bushing 2, the gap 271 penetrates the inner wall surface 23 and the outer wall surface 24; the gap 271 is set, and when the bushing 2 is pressed, the gap 271 provides a certain deformation space for the bushing 2 to shrink in the radial direction, and the bushing 2 can shrink radially, so that the pressing resistance is smaller, it is more convenient to press, and the risk of damaging the solder flow channel can be reduced, so that the solder flow is relatively easier.

[0030] In this embodiment, preferably, the first slotted surface 272 and the second slotted surface 273 are respectively straight surfaces extending along the axial direction of the bushing 2, and the first slotted surface 272 and the second slotted surface 273 are arranged parallel to each other in the circumferential direction of the bushing 2. Such an arrangement is not only convenient for manufacturing, but also the first slotted surface 272 and the second slotted surface 273 are arranged parallel to each other. When the bushing 2 is installed into the first pipe 1, when the bushing 2 contracts radially, the distance between the first slotted surface 272 and the second slotted surface 273 can change evenly. After the bushing 2 is fully installed, the distance from any point on the first slotted surface 272 to the second slotted surface 273 in the circumferential direction of the bushing 2 is nearly equal. In this way, during welding, the solder can flow evenly along the compressed gap 271, reducing the possibility of the solder being blocked because the gap 271 is too small or the possibility of the solder leaking because the gap is too large, thereby making the weld full, improving the strength of the weld part, and reducing the weld leakage rate.

[0031] Of course, the slotted surface can also be a non-straight surface, that is, the first slotted surface 272 and the second slotted surface 273 are respectively non-straight surfaces that do not extend along the axial straight line of the bushing 2. The slotted surface can be in various shapes such as U-shaped, wavy, curved, etc., as long as: the first slotted surface 272 and the second slotted surface 273 are adjacently arranged in the circumferential direction of the bushing 2, and can provide a deformation space for the radial contraction of the bushing 2. Slotted surfaces of other shapes are not described in detail here.

[0032] Furthermore, the bushing 2 also includes a generally cylindrical body 3, the slit portion 27 includes a first slit portion 274, the first slit portion 274 is arranged on the body 3, the first slit portion 274 includes a first slit 2741, and the outer wall surface of the body 3 is provided with a first groove 31, the extension direction of the first groove 31 is the same as the extension direction of the first slit 2741, the first groove 31 and the first slit 2741 serve as solder flow channels, and the extension directions of the two are the same, so that when the solder is melted by heat, it can flow into the first groove 31 and the first slit 2741 through capillary phenomenon, and the two have the same extension direction, so that the direction of solder flow can be consistent, which can relatively reduce the risk of poor solder flow, improve the quality of the weld, and further make the weld fuller and more beautiful. In addition, such a setting is more convenient to manufacture. The bushing 2 also includes a first flange portion 25, which is connected to one end of the main body 3. The first flange portion 25 includes a second groove 251. The second groove 251 is arranged on the end surface of the first flange portion 25 relatively close to the main body 3. At least part of the second groove 251 is connected to the first groove 31. With this arrangement, during welding, the melted solder flows into the second groove 251 through the first groove 31, which can increase the space for accommodating the solder and reduce the risk of solder leakage, thereby further improving the connection strength between the bushing 2 and the refrigeration parts. The slit portion 27 also includes a second slit portion 275, and the second slit portion 275 includes a second slit 2751. The second slit 2751 is arranged on the first flange portion 25. In the axial direction of the bushing 2, the second slit 2751 penetrates the two end surfaces of the first flange portion 25. In the radial direction of the bushing 2, the second slit 2751 penetrates the wall of the second flange portion 26. The second slit 2751 is connected with the first slit 2741. The second groove 251 extends along the radial direction of the bushing 2, and the extension direction of the second slit 2751 is the same as the extension direction of the second groove 251. In this way, when the solder is heated and melted, it can flow into the second groove 251 and the second slit 2751 through the capillary phenomenon. The two extend in the same direction, so that the direction of solder flow is consistent, which can relatively reduce the risk of poor solder flow, improve the quality of the weld, and further make the weld fuller and more beautiful. In addition, such a setting is more convenient to manufacture.

[0033] The bushing 2 includes a slotted portion 27, and the slotted portion 27 includes a first slotted surface 272 and a second slotted surface 273. In the circumferential direction of the bushing 2, the first slotted surface 272 and the second slotted surface 273 are arranged in parallel, and the spacing between the two can be set at 0.1mm-1mm. The spacing between the first slotted surface 272 and the second slotted surface 273 is the width dimension of the gap 271 in the circumferential direction of the bushing 2, and the width dimension of the gap 271 in the circumferential direction of the bushing 2 is defined as L. The L value is a variable. The value of L is different before and after the bushing 2 is installed with the refrigeration parts. If the L value is too large after installation, the solder will flow out of the slot 271 in large quantities due to capillary phenomenon after melting during welding, which is easy to cause solder leakage. If the L value is too small after installation, the solder is easily blocked and accumulated, resulting in poor solder flow.

[0034] In order to further illustrate the influence of the gap 271 on the press-fitting resistance of the bushing 2, an example is given: before the bushing 2 is installed, the size of the gap 271 in the circumferential direction of the bushing 2 is defined as L1, and after the bushing 2 is installed, the size of the gap 271 in the circumferential direction of the bushing 2 is defined as L2, which satisfies: L2 is less than L1. In the current technology, when a seamless copper bushing is used, the bushing 2 and the connecting end 11 of the refrigeration part are matched by interference fit. According to the matching dimension chain, the interference amount generally needs to be 0.01 to 0.08 mm. Generally, the outer diameter tolerance of the bushing wire drawing is 0.04 mm, and the inner diameter tolerance of the connecting end 11 is 0.03 mm. At the same time, the minimum interference amount of 0.01 mm must be guaranteed; if the tolerance is reduced, the manufacturing accuracy and manufacturing cost of the parts will be greatly improved. If the interference amount is large during welding after press-fitting, the solder will have difficulty in flowing, making the weld not full enough, affecting the strength of the weld part, and increasing the weld leakage rate. To solve the above problem, preferably, before the bushing 2 is installed, the L1 value is controlled within the range of 0.1-0.13mm, so that the interference between the bushing 2 and the connecting end 11 after manufacture can be controlled within 0.01-0.08mm. However, since the bushing 2 has elasticity, the actual interference between the bushing 2 and the connecting end 11 after manufacture can be controlled within 0-0.05mm. Setting the size of the gap 271 in this way can not only facilitate press-fitting, but also facilitate solder flow to make the weld fuller, thereby further improving the welding strength, without reducing the tolerance and significantly increasing the difficulty and cost of parts manufacturing.

[0035] The present application also provides a pipe assembly 100 for a refrigeration system. The material of the first pipe fitting 1 can be iron, aluminum, steel, copper and other materials. The first pipe fitting 1 in the present application can be the refrigeration part mentioned above, and can be a muffler, a liquid reservoir, an oil separator, a filter, a pipe fitting and the like. The first pipe fitting 1 made of steel is mainly described below. The first pipe fitting 1 has a connecting end 11 for fluid inflow or fluid outflow, and a step 111 is provided on the inner wall surface of the connecting end 11. The pipe assembly 100 also includes the bushing 2 mentioned above. The material of the bushing 2 can be copper. In the process of manufacturing the pipe assembly 100, the bushing 2 and the connecting end 11 can be fixed by interference fit. In order to make the connection more firm, it can be further connected by welding. At least part of the outer wall of the bushing 2 is welded to at least the inside of the connecting end 11. The welding method can be brazing, furnace welding, argon arc welding, laser welding and the like.

[0036] Specifically, the bushing 2 includes a generally cylindrical body 3, and at least a portion of the outer wall of the body 3 is welded to at least the inside of the connecting end 11. During welding, the solder melts, and at least a portion of the gap 271 and at least a portion of the groove 20 are filled with solder. The gap 271 and the groove 20 both serve as solder flow channels, which increases the solder accommodating space, reduces the risk of solder leakage and overflow, and further improves the welding strength between the two. In addition, when the bushing 2 is pressed onto the connecting end 11 of the first pipe fitting 1, the gap 271 provides the bushing 2 with a radial contraction deformation space, which can relatively reduce the pressing resistance, make pressing easier, and also reduce the risk of the solder flow channel being damaged.

[0037] The bushing 2 includes a first flange portion 25, and at least part of the outer wall of the body 3 is welded to the inner wall of the connecting end portion 11. The first flange portion 25 is relatively located on the axial outer side of the first pipe 1. The first flange portion 25 and the end face of the connecting end portion 11 can be directly pressed and matched to axially position the bushing 2. In this arrangement, the area of ​​the weld exposed to the outside is reduced, which can relatively slow down the speed of the weld corrosion and further improve the welding strength of the bushing 2 and the first pipe 1. Of course, the first flange portion 25 and the end face of the connecting end portion 11 can also be indirectly matched through solder to axially position the bushing 2; specifically, the first flange portion 25 and the end face of the connecting end portion 11 have an axial gap, which can be used to place solder. In the welding process, the solder is heated and melted to fill the gap, and the bushing 2 and the first pipe 1 are fixedly connected.

[0038] The pipeline assembly 100 also includes a second pipe fitting 4, and the bushing 2 includes a second flange portion 26. The second flange portion 26 is arranged at an end of the main body 3 away from the first flange portion 25, and the second flange portion 26 is located on the inner side of the main body 3. The second flange portion 26 is used to axially position the second pipe fitting 4 connected to the bushing 2, thereby improving the installation accuracy between the second pipe fitting 4 and the bushing 2; at least part of the outer wall of one end of the second pipe fitting 4 is welded to at least part of the inner wall of the bushing 2. During welding, the solder melts, and at least part of the gap 271 is filled with solder. The gap 271 serves as a solder circulation channel, which increases the solder accommodating space, reduces the risk of solder leakage and overflow, and further improves the welding strength between the two.

[0039] A guide surface 34 whose diameter gradually decreases toward the axis is formed by shrinking at one end of the body 3 away from the first flange portion 25, and a first groove 31 is formed on the outer wall of the body 3 by machining. The first groove 31 is distributed circumferentially along the outer wall of the body 3. The machining method can be turning, extrusion, wire drawing, etc., preferably wire drawing. In this way, the solder melts and penetrates into the first groove 31 through the capillary effect, and completely fills the matching gap between the body 3 and the connecting end 11. The first groove 31 is set. When the bushing 2 and the connecting end 11 are welded together, the contact area between the solder and the outer peripheral wall of the body 3 can be effectively expanded, and the welding strength between the bushing 2 and the first pipe 1 is further improved. Preferably, the first groove 31 is evenly distributed circumferentially on the outer peripheral wall of the body 3, which is convenient for manufacturing and more conducive to the smooth flow of solder. Further, in order to make the solder flow more smoothly, the first groove 31 and the gap 271 are not connected, and preferably the extension direction of the two is the same.

[0040] Furthermore, a second groove 251 may be provided at the end surface of the first flange portion 25 close to the body 3, and the first groove 31 and the second groove 251 are connected to each other, so as to facilitate the flow of solder during welding. After the second groove 251 is provided, the solder melts and flows into the second groove 251 through the first groove 31 by the capillary effect, and completely fills the fitting gap between the first flange portion 25 and the end surface of the connecting end 11, thereby slowing down the corrosion rate of the external environment on the weld of the first pipe fitting and prolonging the life of the pipeline assembly. In addition, such a setting can also facilitate the observation of the flow of solder between the bushing 2 and the connecting end 11 to judge whether the welding quality is qualified, and can also provide relatively more space to accommodate the solder, further reducing the risk of the solder overflowing the fitting gap between the bushing 2 and the connecting end 11. In order to make the solder flow more smoothly, the second groove 251 and the gap 271 are not connected. Preferably, the extension direction of the second groove 251 is the same as the extension direction of the gap 271; with this arrangement, when the first flange portion 25 and the end face of the connecting end portion 11 are welded together, the solder melts and passes through the second groove 251 and the gap 271 through a capillary effect, and is completely filled into the fitting gap between the first flange portion 25 and the end face of the connecting end portion 11. In this solution, the direction of solder flow is consistent, which can relatively reduce the risk of poor solder flow, further make the weld fuller, and improve the weld quality.

[0041] During the assembly process of the pipeline assembly 100, the bushing 2 is inserted into the connection end 11 of the first pipe 1, so that at least part of the outer wall of the body 3 is matched with at least part of the inner wall of the connection end 11, and a step portion 111 is provided inside the connection end 11. An annular solder (such as a solder ring) can be preset in the connection end 11 of the bushing 2, so that the solder ring is retained on the step portion 111, and then the bushing 2 is pressed into the connection, and a receiving portion for accommodating the preset solder is formed between the guide surface 34 and the step portion 111. The assembly is placed in a furnace welding device and heated to an appropriate process temperature, and the solder melts and fills the gap space between the body 3 and the inner wall of the connection end 11 by capillary effect, completing the consolidation of the bushing 2 and the first pipe 1, and forming the pipeline assembly 100. Furthermore, during the assembly of the pipe assembly 100, the first flange portion 25 and the end surface of the connection end portion 11 can be directly pressed together, or a gap can be provided between the two, and solder is arranged in the gap. Compared with the two schemes, it is preferred that the first flange portion 25 and the end surface of the connection end portion 11 are directly pressed together. This arrangement reduces the possibility of the weld being exposed to the air and causing weld corrosion, and does not affect the overall strength of the first pipe fitting, making the system work more reliable. In addition, the solder is placed in the receiving portion between the guide surface 34 and the step portion 111, and the flow of the solder can be easily observed from the outside.

[0042] In the above embodiment, the first groove 31 and the second groove 251 may also be replaced by convex marks, ridges, etc. The extending direction of the ridges or convex marks is the same as the extending direction of the gap, and the same technical effect can be produced.

[0043] In the above embodiments, the bushing 2 is respectively arranged at the inlet end and the outlet end of the flow path. It should be understood that, according to actual needs, it can be arranged only at the inlet end or the outlet end of the flow path, which also belongs to the technical protection scope of the present invention.

[0044] The present application also provides a method for manufacturing a pipeline assembly 100. The pipeline assembly 100 includes at least a first pipe 1 and a bushing 2. The method for manufacturing the pipeline assembly 100 includes at least the following steps:

[0045] Providing a plate-like material as a manufacturing base material for the bushing;

[0046] Rolling the substrate into a cylindrical substrate with opposite end faces, so that two parallel end faces of the substrate face each other and a gap 271 is formed between the two end faces;

[0047] The outer wall of the cylindrical substrate is machined to form a groove 20 on the surface thereof, wherein the groove 20 and the slit 271 extend in the same direction;

[0048] Cutting and flanging the substrate with the groove 20 to obtain the bushing 2;

[0049] The first pipe 1 and solder are provided, the first pipe, the solder and the bushing are assembled, the first pipe 1 and the bushing 2 are connected by welding, and the solder melts and flows to at least a part of the gap and at least a part of the groove.

[0050] The present application also provides another method for manufacturing a pipeline assembly 100, wherein the pipeline assembly includes a first pipe member 1 and a bushing 2, and the method for manufacturing the pipeline assembly includes at least the following steps:

[0051] Providing a pipe as a base material for manufacturing the bushing;

[0052] Performing grooving on the substrate to obtain a substrate with a slit 271, wherein the slit extends along the axial direction of the substrate and passes through both ends of the substrate;

[0053] The outer wall of the substrate with the slit is machined to form a groove 20 on the surface, and the groove 20 and the slit 271 extend in the same direction;

[0054] Cutting and flanging the substrate with the groove 20 to obtain the bushing 2;

[0055] A first pipe 1 and solder are provided, the first pipe 1 , the solder and the bushing 2 are assembled, and the first pipe 1 and the bushing 2 are connected by welding, and the solder melts and flows to at least a portion of the gap 271 and at least a portion of the groove 20 .

[0056] The pipeline assembly 100 manufactured by the above method has a gap 271 during the assembly process when the bushing 2 is pressed onto the first pipe fitting 1. The gap 271 provides the bushing 2 with a deformation space for radial contraction, thereby reducing the pressing resistance and making the assembly more convenient and easy. In addition, the bushing 2 is provided with a groove 20, and the extension direction of the groove 20 is the same as that of the gap 271. The groove 20 and the gap 271 serve as solder flow channels. After the solder melts, it flows to at least part of the groove 20 and at least part of the gap 271. This can relatively increase the space for accommodating the solder and relatively reduce the risk of solder leakage and overflow. In addition, the solder flows in a consistent direction, which further improves the quality of the weld and thus improves the welding strength.

[0057] In the above manufacturing method, the grooves are machined by machining, and the machining can be done by turning, extrusion, wire drawing and other processing methods, and wire drawing is preferred to process the grooves; the grooving processing described in the second embodiment of the manufacturing method is mainly used to process gaps, and the grooving processing can be done by turning, stamping, etc., as long as the gaps on the pipe can be processed.

[0058] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A bushing for a refrigeration system, the bushing (2) comprising a slotted portion (27) and a plurality of grooves (20), the slotted portion (27) comprising a slit (271), and the extending direction of the groove (20) being the same as the extending direction of the slit (271).

2. The bushing according to claim 1, characterized in that: Along the axial direction of the bushing (2), the slit (271) penetrates both end surfaces of the bushing (2), and along the radial direction of the bushing (2), the slit (271) penetrates the side wall of the bushing (2).

3. The bushing according to claim 2, characterized in that: The end surfaces of the bushing (2) are respectively a first end surface (21) and a second end surface (22); the slit portion (27) comprises a first slit surface (272) and a second slit surface (273); The first slotted surface (272) connects the first end surface (21) and the second end surface (22), and the second slotted surface (273) connects the first end surface (21) and the second end surface (22). ； The bushing (2) further comprises an inner wall surface (23) and an outer wall surface (24); the first slotted surface (272) connects the inner wall surface (23) and the outer wall surface (24); and the second slotted surface (273) connects the inner wall surface (23) and the outer wall surface (24).

4. The bushing according to any one of claims 1 to 3, characterized in that: The bushing (2) comprises a body (3), the slit portion (27) comprises a first slit portion (274), the first slit portion (274) comprises a first gap (2741), and the outer wall surface of the body (3) is provided with a first groove (31), and the extension direction of the first groove (31) is the same as the extension direction of the first gap (2741).

5. The bushing according to claim 4, characterized in that: The bushing (2) comprises a first flange portion (25), the first flange portion (25) being connected to one end of the body (3), the first flange portion (25) comprising a second groove (251), at least a portion of the second groove (251) being connected to the first groove (31), the slit portion (27) comprising a second slit portion (275), the second slit portion (275) comprising a second gap (2751), the second gap (2751) being connected to the first gap (2741), and the extension direction of the second gap (2751) being the same as the extension direction of the second groove (251).

6. The bushing according to claim 5, characterized in that: The slit portion (27) comprises a first slit surface (272) and a second slit surface (273). In the circumferential direction of the bushing (2), the first slit surface (272) and the second slit surface (273) are arranged in parallel, and the distance between the two is set at 0.1 mm-1 mm.

7. A piping assembly for a refrigeration system, the piping assembly comprising a bushing (2) as claimed in any one of claims 1 to 6 and a first pipe fitting (1), the first pipe fitting (1) comprising a connecting end (11), at least a portion of the outer wall of the bushing (2) being welded to at least a portion of the inner wall of the connecting end (11), and at least a portion of the gap (271) and at least a portion of the groove (20) being filled with solder.

8. The pipeline assembly according to claim 7, characterized in that: The pipeline assembly includes a second pipe fitting (4), and the bushing (2) includes a second flange portion (26), the second flange portion (26) is used to axially limit the second pipe fitting (4), at least a portion of the outer wall of one end of the second pipe fitting (4) is welded to at least a portion of the inner wall of the bushing (2), and at least a portion of the gap (271) is filled with solder.

9. A method for manufacturing a pipeline assembly, the pipeline assembly comprising at least a first pipe member (1) and a bushing (2), the pipeline assembly manufacturing method comprising at least the following steps: Providing a plate-like material as a manufacturing base material for the bushing; Rolling the substrate into a cylindrical substrate with opposite end faces, so that two parallel end faces of the substrate face each other and a gap (271) is formed between the two end faces; The outer wall of the cylindrical substrate is machined to form a groove (20) on the surface thereof, wherein the groove (20) and the slit (271) extend in the same direction; Cutting and flanging the base material with the groove (20) to obtain the bushing (2); The first pipe (1) and solder are provided, the first pipe, the solder and the bushing are assembled, the first pipe (1) and the bushing (2) are connected by welding, and the solder melts and flows to at least part of the gap and at least part of the groove.

10. A method for manufacturing a pipeline assembly, the pipeline assembly comprising at least a first pipe member (1) and a bushing (2), the pipeline assembly manufacturing method comprising at least the following steps: Providing a pipe as a base material for manufacturing the bushing; Performing grooving processing on the substrate to obtain a substrate with a slit (271), wherein the slit (271) extends along the axial direction of the substrate and penetrates both ends of the substrate; The outer wall of the substrate with the slit (271) is machined to form a groove (20) on the surface thereof, wherein the groove (20) and the slit (271) extend in the same direction; Cutting and flanging the base material with the groove (20) to obtain the bushing (2); A first pipe (1) and solder are provided, the first pipe (1), the solder and the bushing (2) are assembled, the first pipe (1) and the bushing (2) are connected by welding, and the solder melts and flows to at least a portion of the gap (271) and at least a portion of the groove (20).

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