Fittings, Tube Assemblies and Heat Exchangers

Abstract

The fitting, pipe assembly, and heat exchange system include a main body (10), the side of which has a plurality of through holes (11) spaced apart from one another, a cam (12) provided at the opening of the through holes (11), and a flange hole (13) drilled in the end face of the cam (12) away from the through holes (11), with the flange hole (13) communicating with the through holes (11).

Description

[Technical field]

[0001] (Related Applications) This application claims priority to a Chinese patent application filed on August 14, 2020, bearing application number 202021693721.2 and entitled "Stainless Steel Air Collecting Pipe Assembly", the entire contents of which are incorporated herein by reference. This application claims priority to a Chinese patent application filed on August 14, 2020, bearing application number 202021702236.7 and entitled "Pipe Assembly and Air Collecting Pipe Assembly", the entire contents of which are incorporated herein by reference. This application claims priority to a Chinese patent application filed on August 17, 2020, bearing application number 202021715568.9 and entitled "Joint, Collecting Pipe and Heat Exchanger", the entire contents of which are incorporated herein by reference. This application claims priority to a Chinese patent application filed on August 17, 2020, bearing application number 202021715888.4 and entitled "Air Collection Pipe Assembly," the entire contents of which are incorporated herein by reference.

[0002] TECHNICAL FIELD This application relates to the field of refrigeration, and in particular to fittings, tube assemblies and heat exchangers. [Background technology]

[0003] The throttle valve is mainly applied to the air conditioning and cooling system and is an important component of the cooling system. The two-way throttle valve is mainly applied to the cooling and heating type air conditioning system, and two throttle valve assemblies are installed in parallel or in series to realize the function of flowing in both directions.

[0004] Conventional throttle valves have a relatively large number of parts, a complicated assembly process, and high production costs. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a pipe assembly having the following technical aspects. The device includes a body, and a plurality of through holes are formed on a side surface of the body at intervals, and the openings of the through holes are Convex There is a system in place, Convex A flange hole is drilled in the end face remote from the through hole, and the flange hole and the through hole are in communication with each other.

[0006] A preliminary hole is cut out in advance in the main body, and then a flange hole having a substantially circular cross section is formed by drawing using a circular die. Convex The intermediate region of the pipe has a certain height, and when the branch pipe is welded, the welding material Convex It can flow easily and improve the weld strength. Convex The distance between the end face away from the through hole and the main body is too short. Convex It can be seen that this avoids problems such as poor welding due to a lack of space for the welding material to flow, and also that by forming the flange holes by punching the main body once after cutting out the preliminary holes in the main body, it is possible to avoid cracking of the hole walls of the flange holes by forming the flange holes by punching the main body once.

[0007] In one embodiment, Convex The end face away from the body is flat.

[0008] In one embodiment, Convex The end face remote from the body is an arcuate surface, and the absolute value H of the height difference between the center point of the arcuate surface and both end points of the arcuate surface along the axial direction of the flange hole is 1 mm or less.

[0009] In one embodiment, a body and Convex and one end of the arcuate portion is Convex and the other end is connected to the main body.

[0010] In one embodiment, the radius of the arcuate portion is in the range of 0.5-4.

[0011] In one embodiment, the radius of the arcuate portion is in the range of 2 to 3.5.

[0012] In one embodiment, the body is a stainless steel body; Convex is made of stainless steel Convex It is.

[0013] The present application further provides a pipe assembly including a fitting according to any one of the above claims.

[0014] In one embodiment, the pipe assembly includes a plurality of branch pipes, each of which is connected to a fitting, and the branch pipes are copper branch pipes.

[0015] In one embodiment, the pipe assembly includes a fitting and a curved pipe connected to an end of the fitting, and the pipe assembly includes a connection sleeve, one end of which is connected to the curved pipe and the other end of which is provided with a first connection hole, and the outer wall of the fitting and the connection hole are transition-fitted or interference-fitted to fixedly connect the connection sleeve and the fitting.

[0016] In one embodiment, the first connection hole includes a first hole segment and a second hole segment, and a fitting is sequentially inserted into the first hole segment and the second hole segment, and the fitting and the first hole segment are transition-fitted and the fitting and the second hole segment are interference-fitted.

[0017] In one embodiment, along the axial direction of the first connection hole, the length of the second hole segment is less than or equal to one third of the length of the first connection hole.

[0018] In one embodiment, the first hole segment is a tapered hole and the second hole segment is a tapered hole, and the taper angles of the tapered hole of the first hole segment and the tapered hole of the second hole segment are both less than 10 degrees.

[0019] In one embodiment, the first connecting hole further includes a third hole segment, the third hole segment being disposed between the first hole segment and the second hole segment, the third hole segment being a circular hole, the diameter of the circular hole of the third hole segment being the same as the diameter of the small diameter end of the first hole segment, and the diameter of the circular hole of the third hole segment being the same as the diameter of the large diameter end of the second hole segment.

[0020] In one embodiment, the first hole segment is a tapered hole, the taper angle of the tapered hole of the first hole segment is less than 10 degrees, and the second hole segment is a circular hole, the diameter of the small diameter end of the first hole segment is the same as the diameter of the circular hole of the second hole segment.

[0021] In one embodiment, the first hole segment is a circular hole and the second hole segment is a circular hole, the diameter of the first hole segment being greater than the diameter of the second hole segment.

[0022] In one embodiment, the first connecting hole further includes a third hole segment, the third hole segment being disposed between the first hole segment and the second hole segment, the third hole segment being a tapered hole, the diameter of the larger diameter end of the tapered hole of the third hole segment being the same as the diameter of the circular hole of the first hole segment, and the diameter of the smaller diameter end of the tapered hole of the third hole segment being the same as the diameter of the circular hole of the second hole segment.

[0023] In one embodiment, the first hole segment is a circular hole and the second hole segment is a tapered hole, the taper angle of the tapered hole of the second hole segment is less than or equal to 10 degrees, and the diameter of the circular hole of the first hole segment is greater than or equal to the diameter of the large diameter end of the tapered hole of the second hole segment.

[0024] In one embodiment, the tube assembly further includes a locating recess formed inwardly along an outer surface of the connection sleeve.

[0025] In one embodiment, the pipe assembly further includes an end cover, the end cover having at least one second connection hole penetrating the end cover, one end of the branch pipe is fixed to the second connection hole to fixedly communicate between the fitting and the branch pipe, and an outer peripheral wall of the end cover and an inner peripheral wall of the fitting are fitted by a transition fit or an interference fit.

[0026] In one embodiment, the second connecting hole includes a fourth hole segment and a fifth hole segment, the diameter of the fourth hole segment is larger than the diameter of the fifth hole segment, and the branch pipe is fixed to the fourth hole segment.

[0027] In one embodiment, the diameter of the fifth hole segment is equal to or greater than the inner diameter of the branch pipe.

[0028] In one embodiment, the end cover further includes a step located between the fourth hole segment and the fifth hole segment, and an end of the branch pipe abuts against the step.

[0029] In one embodiment, along the axial direction of the connecting hole, the length of the fourth hole segment is greater than one third of the length of the end cover.

[0030] In one embodiment, the branch pipe includes an insertion portion and an extension portion, an outer diameter size of the insertion portion is smaller than an outer diameter size of the extension portion, and there is a tapered surface transition between the insertion portion and the extension portion, and the extension portion can be fitted into the second connection hole.

[0031] In one embodiment, the length of the insertion portion of the second connection hole along the axial direction is equal to or less than the length of the end cover.

[0032] In one embodiment, the end cover further includes a flange disposed on one end surface of the end cover, the diameter of the flange being equal to or greater than the inner diameter of the fitting.

[0033] In one embodiment, a fillet is provided between the other end surface of the end cover and the outer peripheral wall of the end cover.

[0034] In one embodiment, the end cover is a stainless steel end cover.

[0035] In one embodiment, the pipe assembly includes a joint, a plurality of branch pipes, a multi-way pipe, or a first curved pipe, and the joint material is stainless steel; At least one of the branch pipes has a length of 50 mm or more, and the branch pipe having a length of 50 mm or more is made of stainless steel and is welded to the joint, and / or At least one of the branch pipes has one end connected to the joint and welded to the joint, and the other end connected to the multi-directional pipe or the first curved pipe, and the material of the at least one branch pipe is stainless steel.

[0036] In one embodiment, a curved pipe extends from one end of the joint, and the curved pipe is made of stainless steel.

[0037] In one embodiment, the branch pipe and the joint are clearance-fitted, and the gap value is 0.01 to 0.1 mm; Alternatively, an interference fit is provided between the branch pipe and the joint.

[0038] In one embodiment, a plurality of third connecting holes are drilled in the outer wall of the joint, and some of the plurality of branch pipes are fixed in the third connecting holes in one-to-one correspondence.

[0039] In one embodiment, a positioning portion is provided on the outer wall of one end of the branch pipe connected to the fitting, the positioning portion protruding from the outer wall of the branch pipe along the diameter direction of the branch pipe, and when the branch pipe is installed in the connection hole, the positioning portion can abut against the outer wall of the fitting.

[0040] In one embodiment, an insert segment is provided at one end of the branch pipe connected to the joint, and a transition connection is made between the insert segment and the branch pipe via an inclined surface; The tube assembly includes a weld ring that is fitted to the beveled surface and capable of abutting against the outer wall of the fitting.

[0041] In one embodiment, the branch pipe has a reduced diameter segment at one end connected to the multi-directional pipe, the reduced diameter segment being capable of being inserted into the multi-directional pipe.

[0042] In one embodiment, the branch pipe has an enlarged segment at one end connected to the multi-directional pipe, and the multi-directional pipe can be fitted within the enlarged segment.

[0043] In one embodiment, the outer wall of the insert segment is circumferentially slotted, the slot being used for the penetration depth of the weld material.

[0044] In one embodiment, the reduced diameter segment has a circumferential capillary surface on its outer wall.

[0045] The present application further provides a heat exchanger comprising a tube assembly according to any one of the above claims.

[0046] Compared with the prior art, the joint provided in this application has a pre-cut hole in the body, and then the joint is connected by drawing. Convex and forming a flange hole, and forming a through hole by a preliminary hole after molding; Convex provides sufficient space for the flow of welding material, which can improve the welding quality; and since the flange hole of the joint of the present application is not formed by a single punching, it can effectively prevent the hole wall of the flange hole from cracking. [Brief description of the drawings]

[0047] [Figure 1] FIG. 2 is a top view of a portion of the structure of the body and protrusion of the fitting provided in the present application. [Diagram 2] FIG. 2 is a structural schematic diagram of a body and a protrusion of a joint provided in the present application. [Diagram 3] FIG. 3 is an enlarged view of a portion A in FIG. [Figure 4] FIG. 2 is a structural schematic diagram of a pipe assembly according to the first embodiment provided in the present application. [Diagram 5]FIG. 2 is a structural schematic diagram of a main body and a part of a protrusion of a joint according to an embodiment provided in the present application. [Figure 6] FIG. 13 is a structural schematic diagram of a body and a portion of a protrusion of a joint according to another embodiment provided in the present application. [Figure 7] FIG. 13 is a structural schematic diagram of a body and a portion of a protrusion of a joint according to another embodiment provided in the present application. [Figure 8] FIG. 2 is a structural schematic diagram of a pipe assembly according to a second embodiment provided in the present application. [Figure 9] FIG. 2 is a structural schematic diagram of the above-mentioned pipe assembly joint and pipe assembly provided in the present application engaged with each other. [Figure 10] FIG. 2 is a schematic diagram of a connecting sleeve of an embodiment of a pipe assembly provided in the present application. [Figure 11] FIG. 13 is a schematic diagram of a connecting sleeve of a pipe assembly according to another embodiment provided in the present application. [Figure 12] FIG. 13 is a schematic diagram of a connecting sleeve of a pipe assembly according to another embodiment provided in the present application. [Figure 13] FIG. 13 is a schematic diagram of a connecting sleeve of a pipe assembly according to another embodiment provided in the present application. [Figure 14] FIG. 13 is a schematic diagram of a connecting sleeve of a pipe assembly according to another embodiment provided in the present application. [Figure 15] FIG. 13 is a schematic diagram of a connecting sleeve of a pipe assembly according to another embodiment provided in the present application. [Figure 16] FIG. 11 is a structural schematic diagram of a pipe assembly according to a third embodiment provided in the present application. [Figure 17] FIG. 2 is a cross-sectional schematic diagram of a tube assembly according to the above embodiment of the present application. [Figure 18] FIG. 2 is a structural schematic diagram of the end cover of the above embodiment of the present application. [Figure 19] FIG. 2 is a cross-sectional schematic diagram of a tube assembly according to another embodiment of the present application. [Figure 20] FIG. 20 is a structural schematic diagram of the end cover of the embodiment of FIG. 19. [Figure 21] FIG. 11 is a structural schematic diagram of a pipe assembly according to a fourth embodiment provided in the present application. [Figure 22] FIG. 22 is a partially enlarged structural schematic diagram of an embodiment in which a branch pipe and a joint in FIG. 21 are welded together. [Diagram 23] 22 is a partially enlarged structural schematic diagram of another embodiment in which the branch pipe and the joint in FIG. 21 are welded together. FIG. [Figure 24] FIG. 24 is a partially enlarged schematic structural view of the branch pipe in FIG. 23. [Diagram 25] FIG. 22 is a partially enlarged structural schematic diagram of a reduced diameter segment in one embodiment of FIG. 21. [Figure 26] FIG. 22 is a partially enlarged structural schematic diagram of a reduced diameter segment in another embodiment of FIG. 21. [Figure 27] FIG. 22 is a schematic diagram of a partially expanded structure of an expanded diameter segment in one embodiment of FIG. 21.

[0048] In the drawings, the meanings of the symbols are as follows: 100 pipe assembly, 101 joint, 10 body, 11 through hole, 12 Convex , 121 flat surface, 122 arc surface, 13 flange hole, 14 arc portion, 15 third connection hole, 16 protrusion, 20 branch pipe, 21 insertion portion, 22 extension portion, 23 positioning portion, 24 insertion segment, 241 groove opening, 25 inclined surface, 26 reduced diameter segment, 27 expanded diameter segment, 30 curved pipe, 40 inlet pipe, 41 multi-directional pipe, 50 connection sleeve, 51 first connection hole, 511 first hole segment, 512 second hole segment, 52 positioning recess, 51A first connection hole, 511A first hole segment, 512A second hole segment, 51B connection hole, 511B first hole segment, 512B second hole segment, 513B third hole segment, 51C first connection hole, 511C first hole segment, 512C second hole segment, 51D first connection hole, 511D first hole segment, 512D second hole segment, 51E first connection hole, 511E First hole segment, 512E, second hole segment, 513E, third hole segment, 60, end cover, 61, second connection hole, 611, fourth hole segment, 612, fifth hole segment, 613, step portion, 62, flange, 63, fillet, 70, weld ring. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0049] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only a part of the embodiments of the present application, and are not all of the embodiments. All other embodiments that a person skilled in the art can obtain based on the embodiments of the present application without creative effort fall within the scope of protection of the present application.

[0050] It should be noted that when an assembly is said to be "attached" to another assembly, the other It may be directly attached to an assembly, or there may be intervening assemblies. When an assembly is considered to be "mounted" to another assembly, it may be directly mounted to the other assembly, or there may be intervening assemblies present at the same time. When an assembly is considered to be "secured" to another assembly, it may be directly secured to the other assembly, or there may be intervening assemblies present at the same time.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. Herein, the terms used in the specification of this application are merely intended to describe specific embodiments and are not intended to limit the present application. As used herein, the term "and / or" includes any and / or combinations of one or more of the associated listed items.

[0052] 1 to 27, a heat exchanger (not shown) provided in the present application is attached to a cooling system for heat exchange, the heat exchanger includes a heat exchange tube (not shown) and a tube assembly 100, and the heat exchange tube and the tube assembly 100 are fixedly connected. The tube assembly 100 may be an air or liquid collecting tube attached to the outlet and / or inlet of the heat exchanger and used for collecting flow. In this embodiment, the heat exchanger is an evaporator, and the tube assembly 100 is attached to the inlet of the evaporator.

[0053] Example 1 1 to 7, which are structural schematic diagrams of a joint 101 and a pipe assembly 100 provided in Example 1 of the present application.

[0054] Referring to FIG. 1 to FIG. 3, FIG. 1 shows a body 10 and a connector 101 provided in the present application. Convex 2 is a top view of a portion of the structure of the fitting 101 provided in the present application; Convex 12, and FIG. 3 is a partially enlarged view of A in FIG.

[0055] The pipe assembly 100 includes a fitting 101, which includes a body 10 having a plurality of through holes 11 drilled in a side surface of the body 10, the plurality of through holes 11 being uniformly arranged at intervals.

[0056] Specifically, a preliminary hole (not shown) is drilled in advance in the main body 10, and then a circular die is used to draw the main body 10 so that the cross section is approximately circular. Convex 12 is formed, a flange hole 13 is formed, and a through hole 11 having a substantially circular cross section is formed by the preliminary hole after molding.

[0057] Instead of directly punching the side of the body 10 in one go to form the flange hole, a preliminary hole is pre-cut in the side of the body 10 and then the flange hole is formed by flanging. Convex It can be seen that forming the flange hole 12 can prevent the wall of the flange hole 13 from cracking. Also, the preliminary holes are drilled in the main body 10 beforehand, and then the flange hole 13 is formed by drawing. Convex When the intermediate position of 12 is close to the main body 10 without being too low and is welded to the branch pipe 20 described below, Convex 12 provides a space for the welding material to flow, allowing the welding material to flow sufficiently and improving the robustness of the weld.

[0058] In this embodiment, the main body 10 and Convex 12 does not participate in heat exchange, so the main body 10 and Convex 12 is made of stainless steel, 10 is made of stainless steel Convex12, which will reduce costs.

[0059] Main unit 10 and Convex 12, and one end of the arcuate portion 14 is Convex 12 and the other end is connected to the main body 10. Convex By providing a fillet between the 12 and the main body 10, Convex It can be seen that the stress concentration problem between the core 12 and the body 10 can be alleviated.

[0060] Specifically, the arcuate degree range of the arcuate portion 14 is 0.5-4, but the arcuate degree range of the arcuate portion 14 may be 0.5, 1, 2, 3, 4, or any other arbitrary value between 0.5-4.

[0061] Preferably, the arcuate degree range of the arcuate portion 14 is 2 to 3.5. When designed in this way, Convex The stress concentration problem between the arc-shaped portion 12 and the body 10 can be alleviated. If the arc degree of the arc-shaped portion 14 is too small, Convex Stress concentration occurs between the arc-shaped portion 12 and the body 10, and if the arc degree of the arc-shaped portion 14 is too large, it is not possible to arrange a plurality of through holes 11; Convex It also affects the height of 12, Convex This affects the weld strength between the pipe 12 and the branch pipe 20 described below.

[0062] Referring to FIG. 4, FIG. 4 is a structural schematic diagram of a pipe assembly 100 provided in the present application, where the pipe assembly 100 further includes a plurality of branch pipes 20 which are copper branch pipes, and the plurality of branch pipes 20 are each connected to a fitting 101.

[0063] Specifically, the branch pipes 20 are connected to the flange holes 13 in a one-to-one correspondence, and the branch pipes 20 are fixed in the flange holes 13 by welding, which makes it easy to weld and fix the pipe assembly 100 and the copper heat exchange pipe. Since welding between the same materials is relatively easy, the heat exchange pipe is usually made of copper, and the branch pipes 20 are made of copper branch pipes, so that users can easily weld them.

[0064] The pipe assembly 100 further includes a curved pipe 30 and an inlet pipe 40, the curved pipe 30 is located at one end of the pipe assembly 100, one end of the curved pipe 30 is connected to the main body 10, and the other end is connected to the heat exchange tube, the inlet pipe 40 is connected to the main body 10 and is used to connect other pipelines of the cooling system, so that the refrigerant enters the pipe assembly 100 and enters the heat exchange tube to perform heat exchange, and the curved pipe 30 is a U-shaped tube.

[0065] Referring to FIG. 5, FIG. 5 shows the body 10 and the joint 101 of one embodiment provided in the present application. Convex FIG. 1 is a schematic diagram of a portion of the flange hole 13. The end face of the flange hole 13 away from the through hole 11 is a flat surface 121. When designed in this way, Convex 12 ensures sufficient space for the welding material to flow, and Convex The wall of the flange hole 13 being too thin due to the height of the flange hole 12 being too high does not affect the strength of the weld with the branch pipe 20.

[0066] Referring to FIG. 6, FIG. 6 shows the body 10 and the connector 101 of another embodiment of the connector provided in the present application. Convex 12 is a schematic diagram of a portion of the structure of fitting 101 in embodiment 1. The structure of fitting 101 in this embodiment is basically the same as the structure of fitting 101 in embodiment 1, and the explanation of the similarities will be omitted. The difference is that the end face of flange hole 13 away from through hole 11 is an arcuate surface 122, and the arcuate surface 122 is provided so as to protrude in a direction away from through hole 11.

[0067] Along the axial direction of the flange hole 13, the height difference H between the center point of the arcuate surface 122 and both end points of the arcuate surface 122 is 1 mm or less, that is, the height difference between the highest point and the lowest point of the main body 10 from the arcuate surface 122 is 1 mm or less, whereby Convex 12 has sufficient space for the welding material to flow, and Convex If the height of 12 is too high, Convex If 12 is pulled out excessively, the wall of the flange hole 13 becomes relatively thin, which affects the weld strength with the branch pipe 20.

[0068] Referring to FIG. 7, FIG. 7 shows the body 10 and the joint 101 of another embodiment provided in the present application. Convex 12 is a schematic diagram of a portion of the structure; The structure of the joint 101 in this embodiment is basically the same as the structure of the joint 101 in embodiment 1, and the explanation of the similarities will be omitted. The difference is that the end face of the flange hole 13 away from the through hole 11 is an arcuate surface 122, and the arcuate surface 122 is concave in the direction approaching the through hole 11.

[0069] Along the axial direction of the flange hole 13, the height difference H between both end points of the arcuate surface 122 and the center point of the arcuate surface 122 is 1 mm or less, that is, the height difference between the highest point and the lowest point of the main body 10 from the arcuate surface 122 is 1 mm or less, whereby Convex 12 has sufficient space for the welding material to flow.

[0070] In the process, a preliminary hole is cut in advance on the side of the body 10, and then the body is pulled out. Convex 12 and flange hole 13 are formed, and through hole 11 is formed after forming the preliminary hole. With this design, it is possible to prevent the hole wall of flange hole 13 from cracking, and after branch pipe 20 is inserted into flange hole 13, branch pipe 20 is fixed by welding. Convex 12 provides space for the welding material to flow, which can increase the welding strength.

[0071] Example 2 8 to 15 are structural schematic diagrams of the tube assembly provided in Example 2 of the present application.

[0072] As shown in Fig. 8, the present application further provides a pipe assembly, the pipe assembly 100 may include a joint 101 and a curved pipe 30 attached to the end of the joint 101, and may further include branch pipes attached to the side wall of the joint 101, and in order to ensure that the relative position between the curved pipe 30 and each branch pipe meets the requirements or regulations of the air conditioning manufacturer, when the curved pipe 30 is attached to the joint 101, the relative position between the curved pipe 30 and each branch pipe can be adjusted to meet the requirements, or after the curved pipe 30 is fixed and adjusted to the joint 101, it is necessary to ensure that the curved pipe 30 does not deflect during the welding process. Furthermore, the curved pipe 30 of the pipe assembly provided in the present application may be a U-shaped curved pipe or a U-shaped copper curved pipe.

[0073] Specifically, as shown in Fig. 8 to Fig. 11, the pipe assembly 100 further includes a connection sleeve 50 used for connecting the joint 101 and the curved pipe 30, one end of the connection sleeve 50 is connected to the curved pipe 30, and the other end of the connection sleeve 50 is provided with a first connection hole 51, and the outer peripheral wall of the joint 101 and the first connection hole 51 are transition-fitted and / or interference-fitted to fixedly connect the connection sleeve 50 and the joint 101. The curved pipe 30 is fixedly connected to the connection sleeve 50, and the outer peripheral wall of the joint 101 is engaged with the first connection hole 51 of the connection sleeve 50 by the transition fit or the interference fit, so that the joint 101 can be connected to the connection sleeve 50, and the curved pipe 30 and the joint 101 can be fixedly connected through the connection sleeve 50. It should be noted that whether the connection sleeve 50 is fixed to the curved pipe 30 first or the joint 101 first is not limited in the present application.

[0074] As shown in Figures 9 and 10, in one embodiment of the connection sleeve 50 provided in the present application, the first connection hole 51 includes a first hole segment 511 and a second hole segment 512, the fitting 101 is sequentially inserted into the first hole segment 511 and the second hole segment 512, the fitting 101 and the first hole segment 511 are transition-fitted, and the fitting 101 and the second hole segment 512 are interference-fitted. The fitting 101 is connected by adopting two-stage engagement, so that the curved pipe 30 can be better fixed to the fitting 101, and during the fixing process, the position of the curved pipe 30 can be adjusted so that the positions of the curved pipe 30 and other branch pipes meet the requirements. Specifically, the joint 101 can be temporarily fixed in the second hole segment 512 by the interference fit between the joint 101 and the second hole segment 512, the joint 101 and the first connecting hole 51 can be prevented from rotating during the welding process, and the relative position between the joint 101 and the curved pipe 30 and other branch pipes can be adjusted to meet the requirements (i.e., the second hole segment of the joint 101 can be adjusted to meet the requirements). After that, the joint 101 is further fixed in the first hole segment 511 by welding through the transition fit between the joint 101 and the first hole segment 511, so as to realize the fixing of the joint 101 and the first connection hole 51. In other words, the interference fit at the second hole segment 512 can realize the position adjustment and fixing of the relative positions between the branch pipes of the curved pipe 30 to meet the requirements when the curved pipe 30 is attached to the joint 101, and the transition fit at the first hole segment 511 can ensure that the curved pipe 30 is not deflected during the welding process after the curved pipe 30 is fixed and adjusted in position to the joint 101.

[0075] Furthermore, in order to ensure the welding length for engaging the first hole segment 511 and the fitting 101, the length of the second hole segment 512 along the axial direction of the first connection hole 51 is less than one-third of the length of the first connection hole 51, thereby ensuring the welding quality during the engagement process between the first hole segment 511 and the fitting 101.

[0076] 10, in another embodiment of the pipe assembly 100 provided in the present application, in which the first hole segment 511 of the first connecting hole 51 is a tapered hole, the second hole segment 512 is a tapered hole, and the taper angles of the tapered hole of the first hole segment 511 and the tapered hole of the second hole segment 512 are both less than 10 degrees. Specifically, by making the taper angle of the tapered hole of the first hole segment 511 and the taper angle of the tapered hole of the second hole segment 512 less than 10 degrees, the inclination of the tapered hole can be reduced, and the engagement between the first connecting hole 51 and the outer circumferential wall of the joint 101 can be better realized.

[0077] 11, which is a description of another embodiment of the present application, the first hole segment 511A of the first connection hole 51A is a tapered hole, the taper angle of the tapered hole of the first hole segment 511A is 10 degrees or less, and the second hole segment 512A of the first connection hole 51A is a circular hole, and the diameter of the small diameter end of the first hole segment 511A is the same as the diameter of the circular hole of the second hole segment 512A. Specifically, when the first hole segment 511A is a tapered hole and the second hole segment 512A is a circular hole, the circular hole of the second hole segment 512A and the fitting 101 can be interference-fitted, and the tapered hole of the first hole segment 511A and the fitting 101 can be transition-fitted, and the engagement between the outer peripheral wall of the fitting 101 and the first connection hole 51A can be well realized.

[0078] As shown in FIG. 12, a description of another embodiment of the pipe assembly 100 of the present application, in which the first connecting hole 51B further includes a third hole segment 513B in addition to the first hole segment 511B and the second hole segment 512B, the third hole segment 513B is disposed between the first hole segment 511B and the second hole segment 512B, the third hole segment 513B is a circular hole, the diameter of the circular hole of the third hole segment 513B is the same as the diameter of the small diameter end of the first hole segment 511B, and the diameter of the circular hole of the third hole segment 513B is the same as the diameter of the large diameter end of the second hole segment 512B.

[0079] 13, a description of another embodiment of the pipe assembly 100 provided in the present application, in which the first hole segment 511C of the first connecting hole 51C in the pipe assembly is a circular hole, the second hole segment 512C is a circular hole, and the diameter of the first hole segment 511C is larger than the diameter of the second hole segment 512C. Specifically, the circular hole of the first hole segment 511C and the fitting 101 are transition-fitted, and the circular hole of the second hole segment 512C and the fitting 101 are interference-fitted, so that the fixed engagement between the outer peripheral wall of the fitting 101 and the first connecting hole 51C can be well realized, and the fixed connection between the fitting 101 and the curved pipe 30 can be realized.

[0080] As shown in FIG. 14, in the description of one embodiment of a pipe assembly 100 according to the second embodiment of the present application, The first hole segment 511D of the first connection hole 51D is a circular hole, the second hole segment 512D is a tapered hole, the taper angle of the tapered hole of the second hole segment 512D is 10 degrees or less, and the diameter of the circular hole of the first hole segment 511D is greater than or equal to the diameter of the large diameter end of the tapered hole of the second hole segment 512D, and the transition fit between the circular hole of the first hole segment 511D and the outer peripheral wall of the fitting 101 and the interference fit between the tapered hole of the second hole segment 512D and the outer peripheral wall of the fitting 101 fix the fitting 101 to the connection sleeve 50, thereby realizing a fixed connection between the fitting 101 and the curved pipe 30.

[0081] It should be explained that if the diameter of the circular hole of the first hole segment 511D is larger than the diameter of the large diameter end of the tapered hole of the second hole segment 512D, there is a step (not shown) between the circular hole of the first hole segment 511D and the tapered hole of the second hole segment 512D to change the diameter change transition from the circular hole of the first hole segment 511D to the tapered hole of the second hole segment 512D. The second hole segment 512D only needs to meet the requirement that it can be interference-fitted with the fitting 101. Similarly, if the diameter of the circular hole of the first hole segment 511D is the same as the diameter of the large diameter end of the tapered hole of the second hole segment 512D, in this case, one end of the first hole segment 511D and the large diameter end of the second hole segment 512D are overlapped and connected (i.e., as shown in FIG. 14).

[0082] As shown in FIG. 15, a description of another embodiment of the pipe assembly 100 of the second embodiment of the present application, in which the first connecting hole 51E further includes a third hole segment 513E, and the third hole segment 513E is disposed between the first hole segment 511E and the second hole segment 512E, and the third hole segment 513E is a tapered hole, and the diameter of the large diameter end of the tapered hole of the third hole segment 513E is the same as the diameter of the circular hole of the first hole segment 511E, and the diameter of the small diameter end of the tapered hole of the third hole segment 513E is the same as the diameter of the circular hole of the second hole segment 512E.

[0083] 9 , in order to better secure the connection between the outer peripheral wall of the fitting 101 and the connection sleeve 50, the pipe assembly 100 further includes at least one positioning recess 52 formed along the outer surface of the connection sleeve 50 by recessing inward, so as to ensure a fixed connection between the fitting 101 and the curved pipe 30. Preferably, in order to better secure the connection between the fitting 101 and the connection sleeve 50, a plurality of positioning recesses 52 are provided, and the plurality of positioning recesses 52 are provided symmetrically along the axis of the first connection hole 51.

[0084] Example 3 16 to 20 are structural schematic diagrams of the tube assembly provided in Example 3 of the present application.

[0085] 16, the pipe assembly provided in the present application generally includes a joint 101 and a plurality of branch pipes 20, where the branch pipes 20 are used to be attached to the joint 101, and the branch pipes 20 are divided into a branch pipe 20 attached to a side wall of the joint 101 and a branch pipe 20 attached to an end of the joint 101. In this embodiment 3, the branch pipes 20 are intended to be attached to the end of the joint 101.

[0086] As shown in Fig. 16 and Fig. 17, the present application provides a description of a pipe assembly, the pipe assembly 100 including a joint 101, a branch pipe 20, and an end cover 60 used for fixedly connecting the joint 101 and the branch pipe 20, the end cover 60 is provided with at least one second connection hole 61 penetrating the end cover 60, one end of the branch pipe 20 is fixed to the second connection hole 61 to fix and communicate the joint 101 and the branch pipe 20, and the outer peripheral wall of the end cover 60 and the inner peripheral wall of the joint 101 are transition-fitted or interference-fitted. Specifically, the branch pipe 20 is inserted into the second connection hole 61 and then welded to the second connection hole 61. The branch pipe 20 can be fixed to the end cover 60 by fixing the branch pipe 20 to the end cover 60. A transition fit or interference fit is adopted between the outer peripheral wall of the end cover 60 and the inner peripheral wall of the fitting 101, and the gap value is -0.1 mm to 0.1 mm. Therefore, by providing the end cover 60, it becomes easy to fixedly connect the branch pipe 20 and the fitting 101, and the second connection hole 61 penetrating the end cover 60 can ensure communication between the fitting 101 and the branch pipe 20.

[0087] 18, specifically, the end cover 60 further includes a flange 62 provided on one end surface of the end cover 60, and the diameter of the flange 62 is equal to or larger than the inner diameter of the joint 101. As a result, the flange 62 abuts against the end of the joint 101, thereby limiting the insertion of the joint 101 into the end cover 60.

[0088] As shown in FIG. 18, a fillet 63 is provided between the other end face of the end cover 60 and the outer peripheral wall of the end cover 60, making it easy to insert the end cover 60 into the inner diameter of the joint 101 and assemble it.

[0089] In one embodiment of the present application, the end cover 60 is an end cover made of a stainless steel material, and on the premise that the fixing between the joint 101 and the branch pipe 20 is ensured, the cost can be reduced.

[0090] As shown in Figures 17 and 18, in an embodiment in which the end cover 60 provided in the present application fixedly connects the fitting 101 and the branch pipe 20, the second connection hole 61 of the end cover 60 includes a fourth hole segment 611 and a fifth hole segment 612, the diameter of the fourth hole segment 611 is larger than the diameter of the fifth hole segment 612, and the branch pipe 20 is fixably inserted into the fourth hole segment 611, so that the branch pipe 20 can be fixed into the fourth hole segment 611 but cannot be inserted into the fifth hole segment 612, thereby avoiding the branch pipe 20 protruding from the end cover 60.

[0091] As shown in FIG. 18 , the diameter of the fourth hole segment 611 is greater than or equal to the outer diameter of the branch pipe 20, and the diameter of the fifth hole segment 612 is greater than or equal to the inner diameter of the branch pipe 20, thereby ensuring that the fluid does not encounter resistance in the process of flowing from the branch pipe 20 to the fifth hole segment 612, and ensuring the flow capacity of the pipe assembly 100.

[0092] As shown in FIG. 18, the end cover 60 further includes a step portion 613 located between the fourth hole segment 611 and the fifth hole segment 612, such that the end of the branch pipe 20 abuts against the step portion 613, and the step portion 613 can limit the insertion of the branch pipe 20 into the fifth hole segment 612.

[0093] 18, the length of the fourth hole segment 611 along the axial direction of the second connecting hole 61 is greater than one third of the length of the end cover 60. Specifically, the length L1 of the fourth hole segment 611 along the axial direction of the second connecting hole 61 is greater than one third of the length L2 of the second connecting hole 61 of the end cover 60 along the axial direction, i.e., L1>1 / 3 of L2, which ensures that the branch pipe 20 is firmly fixed to the end cover 60 and can prevent problems such as shaking caused by a weak connection between the branch pipe 20 and the end cover 60.

[0094] As shown in Figures 19 and 20, the embodiment of the end cover 60 of another embodiment provided in the present application is described, in which the joint 101 and the branch pipe 20 are fixedly connected. The branch pipe 20 includes an insertion portion 21 and an extension portion 22, the outer diameter size of the insertion portion 21 is smaller than the outer diameter size of the extension portion 22, and there is a taper surface transition between the insertion portion 21 and the extension portion 22. The extension portion 22 can be fitted into the fourth hole segment 611, and further, the extension portion 22 and the fourth hole segment 611 can be fixed to each other. The locking action between the end cover 60 and the second connecting hole 61 limits the length of the branch pipe 20 inserted into the fourth hole segment 611. Specifically, when the branch pipe 20 is inserted to a certain position in the fourth hole segment 611, the extension portion 22 comes into contact with the edge of the end cover 60, limiting the branch pipe 20 from being further inserted into the fourth hole segment 611. Here, after the insertion portion 21 is inserted into the second connecting hole 61, they may be fixed to each other by welding. To ensure the fixing quality, it is necessary to ensure that the length of the insertion portion 21 is at least one third of the axial length of the fourth hole segment 611 of the end cover 60.

[0095] As shown in FIG. 19, in order to prevent the insertion portion 21 of the branch pipe 20 from penetrating the second connecting hole 61, the axial length of the fourth hole segment 611 of the insertion portion 21 is less than or equal to the axial length of the second connecting hole 61 of the end cover 60.

[0096] Example 4 21 to 27 are structural schematic diagrams of the tube assembly provided in Example 4 of the present application.

[0097] As shown in FIG. 21 , specifically, the air collection pipe assembly 100 includes a fitting 101, a plurality of branch pipes 20, a multi-directional pipe 41 and / or a first curved pipe (not shown), in which the fitting 101 is made of stainless steel, and among the plurality of branch pipes 20, at least one branch pipe 20 has a length of 50 mm or more, and the branch pipe 20 having a length of 50 mm or more is made of stainless steel and is welded to the fitting 101, and / or one end of at least one branch pipe 20 among the plurality of branch pipes 20 is connected to the fitting 101 and welded to the fitting 101, and the other end is connected to the multi-directional pipe 41 or the first curved pipe, and the at least one branch pipe 20 is made of stainless steel. When the length of the branch pipe 20 is 50 mm or more, the material of the branch pipe 20 is stainless steel, and when the branch pipe 20 is connected to the multi-directional pipe 41 or the first curved pipe, the branch pipe 20 is made of stainless steel, which can be seen to avoid problems of softening and deformation of the copper pipe that may occur when the branch pipe 20 is too long or when the branch pipe 20 and the fitting 101 are welded to pipelines made of different materials.

[0098] In this embodiment, the first curved pipe is made up of a plurality of branch pipes with long curves.

[0099] Furthermore, the material of the remaining branch pipes 20 (those whose length is shorter than 50 mm or which are not connected to the multi-directional pipe 41 or the first curved pipe) is copper, but is not limited to copper, and the material of the remaining branch pipes 20 may be, for example, stainless steel, or a combination of copper and stainless steel.

[0100] In one embodiment, a curved pipe 30 extends from one end of the joint 101, and the material of the curved pipe 30 is stainless steel. That is, stainless steel is used as the material of the pipeline at the bent portion of the joint 101, which makes it easy to form the joint 101 by integral bending and improves the hardness of the connection portion.

[0101] Furthermore, as shown in Figures 21 to 23, a plurality of third connection holes 15 are drilled in the outer wall of the fitting 101, and some of the multiple branch pipes 20 are fixed in the third connection holes 15 in one-to-one correspondence, so that some of the refrigerant in the fitting 101 flows from these branch pipes 20 into the fitting 101.

[0102] 22, in one embodiment, a positioning portion 23 is provided on the outer wall of one end of the branch pipe 20 connected to the fitting 101, and the positioning portion 23 protrudes from the outer wall of the branch pipe 20 along the diameter direction of the branch pipe 20, and when the branch pipe 20 is attached into the third connecting hole 15, the positioning portion 23 can abut against the outer wall of the fitting 101. It can be seen that when connected to the joint 101, the positioning portion 23 abuts against the outer wall of the joint 101 and can play a restricting role, thereby preventing the branch pipe 20 from being excessively inserted into the inside of the joint 101.

[0103] Furthermore, a plurality of protrusions 16 are further provided on the outer wall of the joint 101, and one third connection hole 15 is drilled for each of the protrusions 16. A positioning portion 23 is provided on the outer wall of the branch pipe 20, and when the branch pipe 20 enters the third connection hole 15 and is connected to the joint 101, the positioning portion 23 abuts against the protrusions 16, thereby achieving a restricting effect.

[0104] 23, in one embodiment, the branch pipe 20 has an end connected to the joint 101 provided with an insert segment 24, the outer surface of the insert segment 24 is provided with an inclined surface 25, and the pipe assembly 100 includes a weld ring 70, which is fitted to the inclined surface 25 of the insert segment 24 and can be abutted against the outer wall of the joint 101. It can be understood that the inclined surface 25 serves as a guide, and the weld ring 70 can be abutted against the large diameter end of the inclined surface 25 by being engaged with the weld ring 70 in use. Of course, the end of the insert segment 24 remote from the joint 101 may be transitionally connected via another structure, such as a stepped surface, etc.

[0105] Furthermore, a plurality of protrusions 16 are further provided on the outer wall of the joint 101, and one third connection hole 15 is drilled corresponding to each of the protrusions 16. The welding ring 70 is fitted onto the outer wall of the inclined surface 25, and when the branch pipe 20 enters the third connection hole 15 and is connected to the joint 101, the welding ring 70 abuts against the protrusions 16 and can perform a restricting function.

[0106] As shown in FIG. 24, a groove 241 is further provided in the circumferential direction of the outer wall of the insertion segment 24, and the groove 241 is used to receive the welding material when welding the fitting 101 and the branch pipe 20 together, and to prevent the welding material from falling into the inside of the fitting 101 through the gap during welding.

[0107] Preferably, the groove opening 241 is multiple, the multiple groove openings 241 are spaced apart along the circumferential direction of the insertion segment 24, and the width of each groove opening 241 extends along the axial direction of the insertion segment 24. It can be seen that providing multiple groove openings 241 can more fully receive the welding material, and further prevent the welding material from falling into the joint 101 through the gap during welding.

[0108] Of course, in other embodiments, the width of each groove 241 may extend along the circumferential direction of the insert segment 24, or may extend along the circumferential direction of the circumferential insert segment 24 and at the same time extend along the axial direction of the insert segment 24, i.e., the width of each groove 241 may extend spirally.

[0109] In one embodiment, the branch pipe 20 and the joint 101 are clearance-fitted with a gap value of 0.01 mm to 0.1 mm, which allows the welding material to penetrate easily and prevents loosening and falling off during welding. Alternatively, the branch pipe 20 and the joint 101 are interference-fitted, and the branch pipe 20 has a pattern (not shown), which ensures a tighter assembly of the branch pipe 20 through a transition fit.

[0110] As shown in Figures 25 and 26, in one embodiment, the branch pipe 20 has a reduced diameter segment 26 at one end connected to the multi-directional pipe 41, and the reduced diameter segment 26 is inserted into the multi-directional pipe 41 to realize the connection between the branch pipe 20 and the multi-directional pipe 41.

[0111] Preferably, the outer wall of the narrowing segment 26 is provided with a capillary action surface (not shown) in the circumferential direction. The capillary action surface is cut to form a mesh of grooves, but it is understood that the capillary action surface may be provided with grooves of other shapes, for example, the capillary action surface may be cut to form linear, oblique, curved or wavy grooves. In another embodiment, the capillary action surface is ground to form a rough surface. The provision of the capillary action surface increases the roughness of the outer wall of the narrowing segment 26 in the circumferential direction, resulting in a tighter connection.

[0112] As shown in FIG. 27, in another embodiment, the branch pipe 20 has an expanded diameter segment 27 at one end connected to the multi-directional pipe 41, and the multi-directional pipe 41 is inserted into the expanded diameter segment 27 to realize the connection between the branch pipe 20 and the multi-directional pipe 41.

[0113] In the pipe assembly 100 provided in the present application, when the length of the branch pipe 20 is 50 mm or more, the material of the branch pipe 20 is stainless steel, and when the branch pipe 20 is connected to the multi-directional pipe 41 or the first curved pipe, the branch pipe 20 is made of stainless steel, thereby avoiding the problems of softening and deformation of the copper pipe that may occur when the branch pipe 20 is too long or when the branch pipe 20 and the joint 101 are welded to pipelines made of different materials, improving the hardness of the branch pipe 20 when connected to the multi-directional pipe 41, and reducing costs.

[0114] The technical features of the above embodiments may be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combinations of these technical features are not contradictory, they should all be considered within the scope of the present specification.

[0115] The above examples merely show some embodiments of the present application, and the description is specific and detailed, but should not be understood as limiting the scope of the application. It should be noted that those skilled in the art can make some further modifications and improvements without departing from the spirit of the present application, all of which are within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of the appended claims.

Claims

1. The device includes a main body, a side surface of the main body is provided with a plurality of through holes spaced apart from one another, a protrusion is provided at the opening of each of the through holes, and a flange hole is provided at an end surface of the protrusion away from the through holes, the flange hole and the through hole are in communication with each other, A joint, wherein the end face of the convex portion remote from the main body is an arcuate surface, and the absolute value H of the height difference between the center point of the arcuate surface and both end points of the arcuate surface along the axial direction of the flange hole is 1 mm or less.

2. A fitting as described in claim 1, wherein the arc surface protrudes in a direction away from the through hole.

3. A fitting as described in claim 1, wherein the arc surface is concave toward the through hole.

4. 2. The joint according to claim 1, further comprising an arc-shaped portion between the body and the protrusion, one end of the arc-shaped portion being connected to the protrusion and the other end being connected to the body.

5. 5. The joint according to claim 4, wherein the arcuate portion has an arc degree range of 0.5 to 4.

6. 5. The joint according to claim 4, wherein the arcuate portion has an arc degree range of 2 to 3.

5.

7. 2. The joint according to claim 1, wherein the body is a stainless steel body and the protrusion is a stainless steel protrusion.

8. A pipe assembly comprising a fitting according to any one of claims 1 to 7.

9. 9. The pipe assembly of claim 8, wherein the pipe assembly includes a plurality of branch pipes, each of the plurality of branch pipes being connected to the fitting, and the branch pipes being copper branch pipes.

10. 9. The pipe assembly according to claim 8, comprising a fitting and a curved pipe connected to an end of the fitting, the pipe assembly including a connection sleeve, one end of the connection sleeve being connected to the curved pipe, and the other end of the connection sleeve being provided with a first connection hole, and an outer peripheral wall of the fitting and the first connection hole are fitted by a transition fit or an interference fit to fixedly connect the connection sleeve and the fitting.

11. 11. The pipe assembly of claim 10, wherein the first connection hole includes a first hole segment and a second hole segment, the fitting is inserted sequentially into the first hole segment and the second hole segment, the fitting and the first hole segment are transition-fitted, and the fitting and the second hole segment are interference-fitted.

12. The pipe assembly according to claim 11 , wherein along the axial direction of the first connecting hole, the length of the second hole segment is less than or equal to one-third of the length of the first connecting hole.

13. 13. The tube assembly of claim 12, wherein the first hole segment is a tapered hole and the second hole segment is a tapered hole, and the taper angles of the tapered hole of the first hole segment and the tapered hole of the second hole segment are both less than or equal to 10 degrees.

14. 14. The pipe assembly of claim 13, wherein the first connecting hole further comprises a third hole segment, the third hole segment being disposed between the first hole segment and the second hole segment, the third hole segment being a circular hole, the diameter of the circular hole of the third hole segment being the same as the diameter of the small diameter end of the first hole segment, and the diameter of the circular hole of the third hole segment being the same as the diameter of the large diameter end of the second hole segment.

15. 13. The pipe assembly of claim 12, wherein the first hole segment is a tapered hole having a taper angle of 10 degrees or less, and the second hole segment is a circular hole, and a diameter of a small diameter end of the first hole segment is the same as a diameter of the circular hole of the second hole segment.

16. The pipe assembly of claim 12 , wherein the first hole segment is a circular hole and the second hole segment is a circular hole, and the diameter of the second hole segment is greater than the diameter of the second hole segment.

17. 17. The pipe assembly of claim 16, wherein the first connecting hole further comprises a third hole segment, the third hole segment being disposed between the first hole segment and the second hole segment, the third hole segment being a tapered hole, the diameter of a larger diameter end of the tapered hole of the third hole segment being the same as the diameter of the circular hole of the first hole segment, and the diameter of a smaller diameter end of the tapered hole of the third hole segment being the same as the diameter of the circular hole of the second hole segment.

18. 13. The pipe assembly of claim 12, wherein the first hole segment is a circular hole and the second hole segment is a tapered hole, a taper angle of the tapered hole of the second hole segment is 10 degrees or less, and a diameter of the circular hole of the first hole segment is equal to or greater than a diameter of a large diameter end of the tapered hole of the second hole segment.

19. 19. A pipe assembly according to any one of claims 10 to 18, wherein the pipe assembly further comprises at least one locating depression recessed inwardly along an outer surface of the connection sleeve.

20. 9. The pipe assembly according to claim 8, comprising a fitting and a branch pipe, the pipe assembly further comprising an end cover, the end cover having at least one second connection hole penetrating the end cover, one end of the branch pipe being fixed to the second connection hole to fixedly communicate between the fitting and the branch pipe, and an outer peripheral wall of the end cover and an inner peripheral wall of the fitting being fitted by a transition fit or an interference fit.

21. 21. The pipe assembly of claim 20, wherein the second connecting hole includes a fourth hole segment and a fifth hole segment, the diameter of the fourth hole segment being greater than the diameter of the fifth hole segment, and the branch pipe is fixed to the fourth hole segment.

22. 22. The pipe assembly of claim 21, wherein the diameter of the fifth hole segment is equal to or greater than an inner diameter of the branch pipe.

23. 22. The pipe assembly of claim 21, wherein the end cover further includes a step located between the fourth hole segment and the fifth hole segment, an end of the branch pipe abutting against the step.

24. A pipe assembly as described in claim 21, wherein the length of the fourth hole segment along the axial direction of the second connection hole is greater than one-third the length of the end cover.

25. 21. The pipe assembly of claim 20, wherein the branch pipe includes an insertion portion and an extension portion, an outer diameter size of the insertion portion being smaller than an outer diameter size of the extension portion, and a tapered surface transition between the insertion portion and the extension portion, and the extension portion can be fitted into the second connection hole.

26. 26. The pipe assembly according to claim 25, wherein a length of the insertion portion along an axial direction of the second connection hole is equal to or less than a length of the end cover.

27. 26. The pipe assembly according to claim 21 or 25, wherein the end cover further includes a flange provided on one end surface of the end cover, the diameter of the flange being equal to or greater than the inner diameter of the fitting.

28. 28. The tube assembly of claim 27, further comprising a fillet between the other end surface of the end cover and an outer peripheral wall of the end cover.

29. 21. The tube assembly of claim 20, wherein the end cover is a stainless steel end cover.

30. A pipe assembly including a joint, a plurality of branch pipes, a multi-directional pipe, or a first curved pipe, the joint material being stainless steel, At least one of the branch pipes has a length of 50 mm, and the branch pipe having a length of 50 mm or more is made of stainless steel and is welded to the joint; and / or 9. The pipe assembly according to claim 8, wherein one end of at least one of the plurality of branch pipes is connected to the fitting and welded to the fitting, and the other end is connected to the multi-directional pipe or the first curved pipe, and the material of at least one of the branch pipes is stainless steel.

31. The pipe assembly according to claim 30, wherein a curved pipe extends from one end of the joint, and the curved pipe is made of stainless steel.

32. The branch pipe and the joint are clearance-fitted, and the gap value is 0.01 to 0.1 mm; 31. The pipe assembly of claim 30, wherein an interference fit is provided between the branch pipe and the fitting.

33. The pipe assembly according to claim 30, wherein a plurality of third connection holes are drilled in an outer wall of the joint, and some of the branch pipes among the plurality of branch pipes are fixed in the third connection holes in one-to-one correspondence.

34. The pipe assembly according to claim 33, wherein an outer wall of one end of the branch pipe connected to the fitting is provided with a positioning portion, the positioning portion protruding from the outer wall of the branch pipe along a diameter direction of the branch pipe, and the positioning portion can be abutted against the outer wall of the fitting when the branch pipe is installed in the third connection hole.

35. An insert segment is provided at one end of the branch pipe connected to the joint, and the insert segment and the branch pipe are connected to each other via an inclined surface; 34. The pipe assembly of claim 33, wherein the pipe assembly includes a weld ring, the weld ring being capable of being fitted to the beveled surface and abutted against an outer wall of the fitting.

36. 31. The pipe assembly of claim 30, wherein the branch pipe has a reduced diameter segment at one end connected to the multi-directional pipe, the reduced diameter segment being insertable within the multi-directional pipe.

37. 31. The pipe assembly of claim 30, wherein the branch pipe has an enlarged segment at one end connected to the multi-directional pipe, the multi-directional pipe being insertable within the enlarged segment.

38. 36. The pipe assembly of claim 35, wherein the insert segment has an outer wall circumferentially grooved, the groove being used for a penetration depth of a weld material.

39. 37. The tube assembly of claim 36, wherein the reduced diameter segment has an outer wall circumferentially provided with a capillary action surface.

40. 40. A heat exchanger comprising a tube assembly according to any one of claims 8 to 39.

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