KR20230049095A - Pipe members, pipe assemblies and heat exchangers - Google Patents

Abstract

In the pipe member, pipe assembly and heat exchange system, the pipe member includes a body (10). A plurality of through holes 11 spaced apart from each other are opened on the side surface of the main body 10 . A boss 12 is installed at a hole opening point of the through hole 11 . The boss 12 has a flange hole 13 opened at a cross section away from the through hole 11 . The flange hole 13 communicates with the through hole 11 .

Description

Pipe members, pipe assemblies and heat exchangers

This application claims priority to a Chinese patent application filed on August 14, 2020 with application number 202021693721.2 and titled "Stainless Steel Gas Collection Pipe Assembly", which is incorporated herein in its entirety. This application claims priority to a Chinese patent application filed on August 14, 2020 with application number 202021702236.7 and titled "Pipe assembly and gas collection pipe assembly", which is incorporated herein in its entirety. This application claims priority to a Chinese patent application filed on August 17, 2020 with application number 202021715568.9 and titled "Pipe member, header pipe and heat exchanger", which is incorporated herein in its entirety. . This application claims priority to a Chinese patent application filed on August 17, 2020 with application number 202021715888.4 and titled "Gas Collection Pipe Assembly", which is incorporated herein in its entirety.

This application relates to the field of refrigeration technology, and more particularly to pipe members, pipe assemblies and heat exchangers.

The throttle valve is an important component of the refrigeration system, mainly applied to the air conditioning refrigeration system. The two-way throttle valve is mainly applied to air conditioning and heating systems, and two throttle valve assemblies are installed in parallel or in series to implement a two-way distribution function.

The conventional throttle valve has a relatively large number of parts, a complicated assembly process, and a high production cost.

In order to solve the above problems, the present application provides a pipe assembly employing the following technical solutions.

The pipe member includes a body. A plurality of through holes spaced apart from each other are opened on the side surface of the main body. A boss is installed at a hole opening point of the through hole. The boss is formed with a flange hole at a cross section away from the through hole. The flange hole communicates with the through hole.

It can be understood that first, a preliminary hole is drilled on the main body, and then a flange hole having a cross section close to a circular shape is formed by drawing with a circular mold. The middle region of the boss thus formed has a constant height. When the branch pipe is welded, the solder can flow on the boss, and the welding strength is improved. It is possible to prevent problems such as defective welding due to a lack of space for solder to flow on the boss because the distance between the end surface of the boss and the main body away from the through hole is too short. At the same time, it is possible to prevent cracks from occurring in the hole wall of the flange hole by first drilling a preliminary hole in the main body and then forming a flange hole in the flange by one-time stamping of the main body.

In one embodiment, the boss is planar in cross section away from the body.

In one embodiment, the boss has an arc surface at a cross section far from the main body, and an absolute value (H) of a height difference between a center point of the arc surface and both end points of the arc surface along an axial direction of the flange hole is 1 mm or less.

In one embodiment, an arc portion is provided between the main body and the boss. One end of the arc portion is connected to the boss, and the other end is connected to the main body.

In one embodiment, the arc degree range of the arc-shaped portion is 0.5 to 4.

In one embodiment, the arc degree range of the arc-shaped portion is 2 to 3.5.

In one embodiment, the body is a stainless steel body and the boss is a stainless steel boss.

The present application further provides a pipe assembly including the pipe member according to any one of the above.

In one embodiment, the pipe assembly includes a plurality of branch pipes. Each of the plurality of branch pipes is connected to the pipe member. The branch pipe is a copper branch pipe.

In one embodiment, it includes a pipe member and a bend connected to the end of the pipe member. The pipe assembly includes a connecting sleeve. One end of the connection sleeve is connected to the bend pipe. A first connection hole is installed at the other end of the connection sleeve. An outer circumferential wall of the pipe member and the connection hole are intermediately fitted or press-fitted to fix and connect the connection sleeve and the pipe member.

In one embodiment, the first connection hole includes a first hole section and a second hole section. The pipe member is sequentially inserted into the first hole section and the second hole section. The pipe member and the first hole section are intermediately fitted. The pipe member and the second hole section are press fit.

In one embodiment, along the axial direction of the first connection hole, the length of the second hole section is less than 1/3 of the length of the first connection hole.

In one embodiment, the first hole section is a tapered hole, and the second hole section is a tapered hole. Both the taper angles of the tapered holes of the first hole section and the tapered holes of the second hole section are 10 degrees or less.

In one embodiment, the first connection hole further includes a third hole section. The third hole section is installed between the first hole section and the second hole section. The third hole section is a circular hole. The diameter of the circular hole of the third hole section is equal to the diameter of the small diameter end of the first hole section. The diameter of the circular hole of the third hole section is equal to the diameter of the large diameter end of the second hole section.

In one embodiment, the first hole section is a tapered hole. A taper angle of the tapered hole in the first hole section is 10 degrees or less. The second hole section is a circular hole. The diameter of the small diameter end of the first hole section is equal to the diameter of the circular hole of the second hole section.

In one embodiment, the first hole section is a circular hole, and the second hole section is a circular hole. A diameter of the second hole section is greater than a diameter of the second hole section.

In one embodiment, the first connection hole further includes a third hole section. The third hole section is installed between the first hole section and the second hole section. The third hole section is a tapered hole. The diameter of the large-diameter end of the tapered hole in the third hole section is equal to the diameter of the circular hole in the first hole section. The diameter of the small-diameter end of the tapered hole of the third hole section is equal to the diameter of the circular hole of the second hole section.

In one embodiment, the first hole section is a circular hole, and the second hole section is a tapered hole. A taper angle of the tapered hole of the second hole section is 10 degrees or less. The diameter of the circular hole in the first hole section is equal to or greater than the diameter of the large diameter end of the tapered hole in the second hole section.

In one embodiment, the pipe assembly further comprises at least one positioning bubble. The positioning bubble is formed concave inward along the outer surface of the connecting sleeve.

In one embodiment, the pipe assembly further includes an end cover. At least one second connection hole passing through the end cover is installed in the end cover. One end of the branch pipe is fixed to the second connection hole. An outer circumferential wall of the end cover is intermediately fitted or press-fitted with an inner circumferential wall of the pipe member to fix and communicate the pipe member and the branch pipe.

In one embodiment, the second connection hole includes a fourth hole section and a fifth hole section. A diameter of the fourth hole section is greater than a diameter of the fifth hole section. The branch pipe is fixed to the fourth hole section.

In one embodiment, the diameter of the fifth hole section is greater than or equal to the inner diameter of the branch pipe.

In one embodiment, the end cover further includes a stepped portion. The stepped portion is located between the fourth hole section and the fifth hole section. An end of the branch pipe abuts on the stepped portion.

In one embodiment, along the axial direction of the connection hole, the length of the fourth hole section is greater than 1/3 of the length of the end cover.

In one embodiment, the branch pipe includes an insertion portion and an external extension portion. An outer diameter dimension of the insertion portion is smaller than an outer diameter dimension of the outer extension portion. A tapered surface transition is formed between the insertion portion and the external extension portion, and the external extension portion may be hooked into the second connection hole.

In one embodiment, a length of the insertion part along the axial direction of the second connection hole is less than or equal to a length of the end cover.

In one embodiment, the end cover further includes a flange installed on one end surface of the end cover. The diameter of the flange is greater than or equal to the inside diameter of the pipe member.

In one embodiment, an arc angle is installed between the other end surface of the end cover and an outer circumferential wall of the end cover.

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

In one embodiment, the pipe assembly includes a pipe member, a plurality of branch pipes, a multi-channel pipe or a first bend pipe. The pipe member material is stainless steel.

A length of at least one of the branch pipes in the plurality of branch pipes is 50 mm or more. The material of the branch pipe having a length of 50 mm or more is stainless steel and is connected to the pipe member by welding.

And/or one end of at least one of the plurality of branch pipes communicates with the pipe member and is connected to the pipe member by welding. The other end communicates with the multi-channel pipe or the first bend pipe, and the material of at least one branch pipe is stainless steel.

In one embodiment, a bend pipe is extended at one end of the pipe member. The material of the bend pipe is stainless steel.

In one embodiment, there is a gap fit between the branch pipe and the pipe member. The clearance value is 0.01 to 0.1 mm.

Alternatively, an interference fit is formed between the branch pipe and the pipe member.

In one embodiment, a plurality of third connection holes are opened on the outer wall of the pipe member. Some of the plurality of branch pipes are fixed in a one-to-one correspondence within the third connection hole.

In one embodiment, a positioning unit is installed on one end of the outer wall to which the branch pipe and the pipe member are connected. The positioning unit protrudes from the outer wall of the branch pipe in a radial direction of the branch pipe. When the branch pipe is mounted in the connection hole, the positioning unit may come into contact with an outer wall of the pipe member.

In one embodiment, an insertion connection section is installed at one end where the branch pipe and the pipe member are connected. The insertion connection section and the branch pipe are connected to be transitioned by an inclined surface.

The pipe assembly includes a welded ring. The welding ring is installed to cover the inclined surface and may come into contact with the outer wall of the pipe member.

In one embodiment, a necking section is provided at one end to which the branch pipe and the multi-channel pipe are connected. The necking section may be inserted into and connected to the multi-channel pipe.

In one embodiment, a flaring section is provided at one end to which the branch pipe and the multi-channel pipe are connected. The multi-channel pipe may be inserted and connected within the flaring section.

In one embodiment, a groove opening is installed in a circumferential direction of an outer wall of the insertion connection section. The groove opening is used for solder penetration.

In one embodiment, a capillary action surface is installed in the circumferential direction of the outer wall of the necking section.

The present application further provides a heat exchanger including the pipe assembly according to any one of the above.

Compared with the prior art, the pipe member provided in the present application first drills a preliminary hole on the main body, then draws to form a boss, and at the same time forms a flange hole. The preformed hole forms a through hole. The boss provides a sufficient flow space for the solder, so that welding quality can be enhanced. In addition, since the flange hole of the pipe member of the present application is not formed by one-time stamping, cracking of the hole wall of the flange hole can be effectively prevented.

1 is a plan view of some structures of a body and a boss of a pipe member according to the present application.
2 is a structural diagram of a main body and a boss of a pipe member according to the present application.
FIG. 3 is a partially enlarged view of point A in FIG. 2 .
4 is a structural diagram of a pipe assembly according to a first embodiment of the present application.
5 is a partial structural diagram of a main body and a boss of a pipe member according to an embodiment of the present application.
6 is a partial structural diagram of a main body and a boss of a pipe member according to another embodiment of the present application.
7 is a partial structural diagram of a main body and a boss of a pipe member according to another embodiment of the present application.
8 is a structural diagram of a pipe assembly according to a second embodiment of the present application.
9 is a structural diagram in which a pipe member and a pipe assembly of the pipe assembly according to the present application are matched.
10 is a schematic view of a connecting sleeve of a pipe assembly according to an embodiment of the present application.
11 is a schematic view of a connecting sleeve of a pipe assembly according to another embodiment of the present application.
12 is a schematic view of a connecting sleeve of a pipe assembly according to another embodiment of the present application.
13 is a schematic view of a connecting sleeve of a pipe assembly according to another embodiment of the present application.
14 is a schematic view of a connecting sleeve of a pipe assembly according to another embodiment of the present application.
15 is a schematic view of a connecting sleeve of a pipe assembly according to another embodiment of the present application.
16 is a structural diagram of a pipe assembly according to a third embodiment of the present application.
17 is a cross-sectional view of a pipe assembly according to the embodiment of the present application.
18 is a structural diagram of an end cover according to the above embodiment of the present application.
19 is a cross-sectional view of a pipe assembly according to another embodiment of the present application.
20 is a structural diagram of an end cover in the embodiment of FIG. 19;
21 is a structural diagram of a pipe assembly according to a fourth embodiment of the present application.
22 is a partially enlarged structural view of an embodiment in which the branch pipe and the pipe member are welded in FIG. 21 .
23 is a partially enlarged structural view of another embodiment in which the branch pipe and the pipe member are welded in FIG. 21 .
24 is a partial enlarged structural view of the branch pipe in FIG. 23;
25 is a partially enlarged structural diagram of a necking section according to an embodiment in FIG. 21 .
26 is a partially enlarged structural diagram of a necking section according to another embodiment in FIG. 21 .
27 is a partially enlarged structural diagram of a flaring section according to an embodiment in FIG. 21 .
The meaning of each symbol in the drawing is as follows.
100 pipe assembly, 101 pipe member, 10 main body, 11 through hole, 12 boss, 121 flat surface, 122 arc surface, 13 flange hole, 14 arc part, 15 third connection hole, 16 protrusion , 20 branch pipe, 21 insertion part, 22 external extension part, 23 positioning part, 24 insertion connection section, 241 groove opening, 25 inclined plane, 26 necking section, 27 flaring section, 30 51A is the first hole section, 512 is the second hole section, 52 is the positioning bubble, 51A is the first Connection hole, 511A is the first hole section, 512A is the second hole section, 51B is the connection hole, 511B is the first hole section, 512B is the second hole section, 513B is the third hole section, 51C is the first connection hole, 511C is the first hole section, 512C is the second hole section, 51D is the first connection hole, 511D is the first hole section, 512D is the second hole section, 51E is the first connection hole, 511E is the first hole section, 512E is a second hole section, 513E is a third hole section, 60 is an end cover, 61 is a second connection hole, 611 is a fourth hole section, 612 is a fifth hole section, 613 is a stepped portion, 62 is a flange, 63 is a The arc angle, 70, is a welded ring.

DESCRIPTION OF EMBODIMENTS The following clearly and completely describes the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. The described embodiments are only some rather than all of the present application. All other embodiments obtained by a person skilled in the art without creative work based on the embodiments of the present application fall within the protection scope of the present application.

Note that when a component is described as being “mounted” on another component, it may be directly mounted on the other component or there may be an intervening component. When a component is described as being “installed” on another component, it may be directly installed on the other component or intervening components may exist simultaneously. When one component is described as being "fixed" to another component, it may be directly fixed to the other component or intervening components may exist simultaneously.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Terms used herein in the specification of the present application are for describing specific embodiments, and are not intended to limit the present application. As used herein, the term “or/and” includes any and all combinations of one or more of the related listed items.

1 to 27, the present application provides a heat exchanger (not shown). The heat exchanger is installed in a refrigeration system and used for heat exchange. The heat exchanger includes a heat exchange tube (not shown) and a pipe assembly 100 . The heat exchange tube is fixedly connected to the pipe assembly 100 . The pipe assembly 100 may be a gas collection pipe or a liquid collection pipe, and is mounted at the outlet and/or inlet points of the heat exchanger and used to collect the flow. In this embodiment, the heat exchanger is an evaporator. The pipe assembly 100 is mounted at the inlet point of the evaporator.

[Example 1]

1 to 7 show structural views of a pipe member 101 and a pipe assembly 100 according to the first embodiment of the present application.

Referring to FIGS. 1 to 3 , FIG. 1 is a plan view of some structures of the main body 10 and the boss 12 of the pipe member 101 according to the present application. 2 is a structural diagram of the body 10 and the boss 12 of the pipe member 101 according to the present application. FIG. 3 is a partially enlarged view of point A in FIG. 2 .

The pipe assembly 100 includes a pipe member 101 . The pipe member 101 includes a body 10 . A plurality of through holes 11 are opened on the side surface of the main body 10 . The plurality of through holes 11 are all equally spaced apart.

Specifically, first, a preliminary hole (not shown) is opened on the main body 10, and a boss 12 having a cross section close to a circular shape is formed by drawing with a circular mold, and at the same time, a flange hole 13 is formed. The formed preliminary hole forms a through hole 11 having a cross section close to circular.

First, by drilling a preliminary hole on the side of the main body 10 and then forming a boss 12 on the flange, the flange hole is not formed by one-time stamping directly on the side of the main body 10, but on the hole wall of the flange hole 13. It can be understood that cracks can be prevented from occurring. In addition, the intermediate position of the boss 12 formed by first opening and drawing a preliminary hole on the main body 10 is too low to approach the main body 10. When welding with the branch pipe 20 described below, the boss 12 can provide a solder flow space so that the solder can sufficiently flow, so that the welding strength is enhanced.

In this embodiment, since the body 10 and the boss 12 are not involved in heat exchange, the body 10 and the boss 12 are installed as the stainless steel body 10 and the stainless steel boss 12, can lower the cost.

An arc portion 14 is provided between the main body 10 and the boss 12 . One end of the arc portion 14 is connected to the boss 12, and the other end is connected to the main body 10. It can be appreciated that a fillet is installed between the boss 12 and the body 10 to alleviate the problem of stress concentration between the boss 12 and the body 10 .

Specifically, the arc degree range of the arc-shaped portion 14 is 0.5 to 4. The radius range of the arc portion 14 may be 0.5, 1, 2, 3, 4, or any value between 0.5 and 4.

Preferably, the arcuate range of the arcuate portion 14 is 2 to 3.5. Through this installation, the problem of stress concentration between the boss 12 and the main body 10 can be alleviated. If the arc of the arc portion 14 is too small, stress concentration may exist between the boss 12 and the main body 10 . If the radius of the arc-shaped portion 14 is too large, the plurality of through holes 11 cannot be arranged. In addition, the height of the boss 12 may be affected, and the welding strength between the boss 12 and the branch pipe 20 may be affected.

Referring to Figure 4, Figure 4 is a structural diagram of the pipe assembly 100 according to the present application. The pipe assembly 100 further includes a plurality of branch pipes 20 . The plurality of branch pipes 20 are copper branch pipes. Each of the plurality of branch pipes 20 is connected to the pipe member 101 .

Specifically, the plurality of branch pipes 20 are connected in a one-to-one correspondence to the flange hole 13 point. Since the branch pipe 20 is fixed in the flange hole 13 by welding, it is easy to weld and fix the pipe assembly 100 and the heat exchange tube made of copper. It can be appreciated that welding between identical materials is relatively simple. The heat exchange pipe is usually made of copper, and the branch pipe 20 is installed as a copper branch pipe so that users can easily weld it.

The pipe assembly 100 further includes a bend pipe 30 and an inlet pipe 40 . The bend pipe 30 is located at one end of the pipe assembly 100. One end of the bend pipe 30 is connected to the main body 10, and the other end communicates with the heat exchange pipe. The inlet pipe 40 is connected to the body 10. This connects other pipelines of the refrigeration system, introduces the refrigerant into the pipe assembly 100, and is introduced into the heat exchange tube to perform heat exchange. The bend pipe 30 is a U-shaped pipe.

Referring to FIG. 5 , FIG. 5 is a partial structural view of the body 10 and the boss 12 of the pipe member 101 according to an embodiment of the present application. The cross section of the flange hole 13 away from the through hole 11 is a plane 121. Through this installation, sufficient space is created on the boss 12 for the solder to flow. In addition, the boss 12 is too high, so that the wall of the flange hole 13 is too thin, so that the welding strength with the branch pipe 20 is not affected.

Referring to FIG. 6, FIG. 6 is a partial structural view of the body 10 and the boss 12 of the pipe member 101 according to another embodiment of the present application. Since the structure of the pipe member 101 of this embodiment is basically the same as that of the pipe member 101 of the first embodiment, the same parts will not be repeatedly described here. The difference is that the cross section far from the through hole 11 of the flange hole 13 is the arc surface 122, and the arc surface 122 is installed so as to protrude toward the direction away from the through hole 11.

Along the axial direction of the flange hole 13, the height difference H between the center point of the arc surface 122 and both ends of the arc surface 122 is not greater than 1 mm. That is, since the height difference between the highest point and the lowest point of the arc surface 122 from the main body 10 is 1 mm or less, the boss 12 has a sufficient space for the solder to flow. If the height of the boss 12 is too large, the boss 12 is stretched too long, and the hole wall of the flange hole 13 becomes relatively thin, which may affect the connection strength of the branch pipe 20.

Referring to FIG. 7 , FIG. 7 is a partial structural view of the body 10 and the boss 12 of the pipe member 101 according to another embodiment of the present application. Since the structure of the pipe member 101 of this embodiment is basically the same as that of the pipe member 101 of the first embodiment, the same parts will not be repeatedly described here. The difference is:

A cross section of the flange hole 13 far from the through hole 11 is an arc surface 122, and the arc surface 122 is concave toward a direction close to the through hole 11.

Along the axial direction of the flange hole 13, the height difference (H) between the end points of both ends of the arc surface 122 and the center point of the arc surface 122 is not greater than 1 mm. That is, the arc surface 122 has a height difference between the highest point and the lowest point from the main body 10 of 1 mm or less. This makes the boss 12 have enough space for the solder to flow.

In the process of processing, a preliminary hole is first drilled on the side of the main body 10, and then the boss 12 and the flange hole 13 are formed by drawing. After the preliminary hole is formed, the through hole 11 is formed. This installation can prevent cracks from occurring in the hole wall of the flange hole 13 . Also, after the branch pipe 20 is inserted into the flange hole 13, the branch pipe 20 is fixed by welding. The boss 12 can provide a solder flow space to enhance welding strength.

[Example 2]

8 to 15 are structural diagrams of a pipe assembly according to a second embodiment of the present application.

As shown in Fig. 8, the present application further provides a pipe assembly. The pipe assembly 100 may include a pipe member 101 and a bend pipe 30 mounted at an end of the pipe member 101 . In addition, each branch pipe mounted on the side wall of the pipe member 101 may be included. In order to ensure that the relative position of the bend pipe 30 and each branch pipe meets the requirements or regulations of the air conditioning system manufacturer, when the bend pipe 30 is mounted on the pipe member 101, the position is adjusted to The relative position between (30) and each branch can be made to meet your needs. Alternatively, after the bend pipe 30 is fixed on the pipe member 101 to adjust the position, it is possible to ensure that the bend pipe 30 is not deflected during the welding process. In addition, the bend pipe 30 of the pipe assembly provided in the present application may be a U-shaped bend pipe or a U-shaped bend pipe made of copper.

Specifically, as shown in FIGS. 8 to 11 , the pipe assembly 100 further includes a connection sleeve 50 used to connect the pipe member 101 and the bend pipe 30 . One end of the connection sleeve 50 is connected to the bend pipe 30. A first connection hole 51 is installed at the other end of the connection sleeve 50 . The outer circumferential wall of the pipe member 101 and the first connection hole 51 are intermediately fitted and/or press-fitted, so that the connection sleeve 50 and the pipe member 101 are fixedly connected. The bend pipe 30 is fixedly connected to the connecting sleeve 50. The outer circumferential wall of the pipe member 101 may be matched to the first connection hole 51 of the connection sleeve 50 by means of an intermediate fit or interference fit. The pipe member 101 may be connected on the connection sleeve 50, and furthermore, the bend pipe 30 and the pipe member 101 may be fixedly connected through the connection sleeve 50. Note that the present application does not limit whether the connecting sleeve 50 is fixed on the bend pipe 30 first or on the pipe member 101 first.

9 and 10 show an embodiment of the connecting sleeve 50 according to the present application. The first connection hole 51 includes a first hole section 511 and a second hole section 512 . The pipe member 101 is sequentially inserted into the first hole section 511 and the second hole section 512 . The pipe member 101 and the first hole section 511 are intermediately fitted, and the pipe member 101 and the second hole section 512 are press-fitted. The pipe member 101 is matched and connected by a two-stage matching method, so that the bend pipe 30 can be better fixed on the pipe member 101 and the position of the bend pipe 30 can be adjusted during the fixing process. Therefore, the location of the bend pipe 30 and other branch pipes makes it easy to meet the requirements. Specifically, the interference fit between the pipe member 101 and the second hole section 512 preliminarily fixes the pipe member 101 in the second hole section 512, so that the pipe member 101 and the first connection hole ( 51) can be prevented from rotating during the welding process. In addition, by adjusting the relative position of the pipe member 101 and the bend pipe 30 (that is, it can be implemented through rotation of the pipe member 101 about the second hole section 512), the bend pipe 30 and other people It can ensure that the relative positioning of institutions continues to meet requirements. Then, the pipe member 101 is additionally fixed in the first hole section 511 by a welding method through an intermediate fit between the pipe member 101 and the first hole section 511, and the pipe member 101 and Fixing of the first connection hole 51 may be implemented. In other words, the interference fit at the point of the second hole section 512 adjusts the position when the bend pipe 30 is mounted on the pipe member 101 so that the relative position between the bend pipe 30 and each branch pipe is required. and implement it so that it can be fixed. The middle fit of the first hole section 511 can ensure that the bend pipe 30 is not deflected during the welding process after adjusting the position by fixing the bend pipe 30 on the pipe member 101.

In addition, in order to ensure a welding length in which the first hole section 511 and the pipe member 101 are matched, the length of the second hole section 512 along the axial direction of the first connection hole 51 is It is less than 1/3 of the length of the hole 51. Accordingly, welding quality may be guaranteed through a matching process between the first hole section 511 and the pipe member 101 .

10 shows another embodiment of the pipe assembly 100 according to the present application. Here, the first hole section 511 of the first connection hole 51 is a tapered hole, and the second hole section 512 is a tapered hole. Both the taper angles of the tapered holes of the first hole section 511 and the tapered holes of the second hole section 512 are 10 degrees or less. Specifically, the taper angle of the tapered hole of the first hole section 511 and the taper angle of the tapered hole of the second hole section 512 are installed so as not to be greater than 10 degrees. Through this, by reducing the inclination of the tapered hole, matching between the first connection hole 51 and the outer circumferential wall of the pipe member 101 can be better realized.

11 shows another embodiment of the present application. The first hole section 511A of the first connection hole 51A is a tapered hole. The taper angle of the tapered hole of the first hole section 511A is 10 degrees or less. The second hole section 512A of the first connection hole 51A is a circular hole. The diameter of the small diameter end of the first hole section 511A is the same as the diameter of the circular hole of the second hole section 512A. Specifically, the first hole section 511A is implemented as a tapered hole, and the second hole section 512A is implemented as a circular hole. The circular hole of the second hole section 512A may be press fit with the pipe member 101, and the tapered hole of the first hole section 511A may be half-fitted with the pipe member 101. Accordingly, matching between the outer circumferential wall of the pipe member 101 and the first connection hole 51A can be well realized.

12 shows another embodiment of the pipe assembly 100 according to the present application. The first connection hole 51B further includes a third hole section 513B in addition to including the first hole section 511B and the second hole section 512B. The third hole section 513B is installed between the first hole section 511B and the second hole section 512B. The third hole section 513B is a circular hole. The diameter of the circular hole of the third hole section 513B is equal to the diameter of the small diameter end of the first hole section 511B. The diameter of the circular hole of the third hole section 513B is equal to the diameter of the large diameter end of the second hole section 512B.

13 shows another embodiment of the pipe assembly 100 according to the present application. The first hole section 511C of the first connection hole 51C in the pipe assembly is a circular hole. The second hole section 512C is a circular hole. The diameter of the first hole section 511C is larger than that of the second hole section 512C. Specifically, the circular hole of the first hole section 511C is intermediately fitted with the pipe member 101 . The circular hole of the second hole section 512C is press-fitted with the pipe member 101 . Accordingly, it is possible to properly implement fixed matching between the outer circumferential wall of the pipe member 101 and the first connection hole 51C, and to implement a fixed connection between the pipe member 101 and the bend pipe 30 .

14 shows an embodiment of a pipe assembly 100 according to a second embodiment of the present application. The first hole section 511D of the first connection hole 51D is a circular hole, and the second hole section 512D is a tapered hole. The taper angle of the tapered hole of the second hole section 512D is 10 degrees or less. The diameter of the circular hole of the first hole section 511D is equal to or greater than the diameter of the large diameter end of the tapered hole of the second hole section 512D. Through the middle fit of the circular hole of the first hole section 511D and the outer circumferential wall of the pipe member 101 and the interference fit of the tapered hole of the second hole section 512D and the outer circumferential wall of the pipe member 101 , By fixing the pipe member 101 on the connection sleeve 50, it is possible to implement a fixed connection between the pipe member 101 and the bend pipe 30.

When the diameter of the circular hole of the first hole section 511D is greater than the diameter of the large diameter end of the tapered hole of the second hole section 512D, the circular hole of the first hole section 511D and the taper of the second hole section 512D There may be a step (not shown) between the mold holes. This changes the change in diameter from the circular hole of the first hole section 511D to the tapered hole of the second hole section 512D. The second hole section 512D only needs to be able to satisfy the requirements to enable interference fit with the pipe member 101. Similarly, if the diameter of the circular hole of the first hole section 511D is equal to the diameter of the large diameter end of the tapered hole of the second hole section 512D, then one end of the first hole section 511D and the second hole section ( 512D) are overlapped and connected (ie, as shown in FIG. 14).

15 shows another embodiment of the pipe assembly 100 according to the second embodiment of the present application. The first connection hole 51E further includes a third hole section 513E. The third hole section 513E is installed between the first hole section 511E and the second hole section 512E. The third hole section 513E is a tapered hole. The diameter of the large-diameter end of the tapered hole of the third hole section 513E is equal to the diameter of the circular hole of the first hole section 511E. The diameter of the small-diameter end of the tapered hole of the third hole section 513E is the same as the diameter of the circular hole of the second hole section 512E.

As shown in FIG. 9 , in order to ensure a secure connection between the outer circumferential wall of the pipe member 101 and the connecting sleeve 50, the pipe assembly 100 further includes at least one positioning bubble 52. Since the positioning bubble 52 is concave inward along the outer surface of the connecting sleeve 50, it is possible to ensure a fixed connection between the pipe member 101 and the bend pipe 30. Preferably, a plurality of positioning bubbles 52 are installed. The plurality of positioning bubbles 52 are installed symmetrically along the axis of the first connection hole 51 . Therefore, a better connection between the pipe member 101 and the connecting sleeve 50 is achieved.

[Example 3]

16 to 20 are structural diagrams of a pipe assembly according to a third embodiment of the present application.

As shown in FIG. 16, the present application provides a pipe assembly. Typically, a pipe member 101 and a plurality of branch pipes 20 are included. Here, the branch pipe 20 is used for mounting on the pipe member 101. The branch pipe 20 is divided into a branch pipe 20 mounted on the side wall of the pipe member 101 and a branch pipe 20 mounted on an end portion of the pipe member 101 . In this Embodiment 3, the branch pipe 20 is used to attach to the end of the pipe member 101.

16 and 17 show a pipe assembly according to the present application. The pipe assembly 100 includes a pipe member 101, a branch pipe 20, and an end cover 60 used to securely connect the pipe member 101 and the branch pipe 20. At least one second connection hole 61 passing through the end cover 60 is installed in the end cover 60 . One end of the branch pipe 20 is fixed to the second connection hole 61 . The outer circumferential wall of the end cover 60 and the inner circumferential wall of the pipe member 101 are intermediately fitted or press-fitted, so that the pipe member 101 and the branch pipe 20 are fixed and communicated. Specifically, the branch pipe 20 is inserted into the second connection hole 61 . The branch pipe 20 may be fixed on the end cover 60 by fixing through a welding method. The outer circumferential wall of the end cover 60 and the inner circumferential wall of the pipe member 101 are intermediately fitted or press-fitted. Its clearance value is -0.1 mm to 0.1 mm. Therefore, through the installation of the end cover 60, the branch pipe 20 and the pipe member 101 are easily fixedly connected. In addition, the second connection hole 61 penetrating the end cover 60 may ensure communication between the pipe member 101 and the branch pipe 20 .

As shown in FIG. 18, specifically, the end cover 60 further includes a flange 62 installed on one end of the end cover 60. The diameter of the flange 62 is equal to or greater than the inside diameter of the pipe member 101 . The flange 62 comes into contact with the end of the pipe member 101, and acts to restrict the insertion of the end cover 60 into the pipe member 101.

As shown in FIG. 18, an arc angle 63 is installed between the other end surface of the end cover 60 and the outer circumferential wall of the end cover 60, and the end cover 60 is fitted to the inner diameter of the pipe member 101. Easy to insert and assemble.

In one embodiment of the present application, the end cover 60 is an end cover made of a stainless steel material. This reduces cost under the premise that fixing of the pipe member 101 and the branch pipe 20 can be guaranteed.

17 and 18 illustrate an embodiment in which the end cover 60 according to the present application fixedly connects the pipe member 101 and the branch pipe 20. The second connection hole 61 of the end cover 60 includes a fourth hole section 611 and a fifth hole section 612 . The diameter of the fourth hole section 611 is greater than that of the fifth hole section 612 . Also, the branch pipe 20 may be inserted to be fixed to the fourth hole section 611 . Therefore, the branch pipe 20 can be fixed to the fourth hole section 611 but cannot be inserted into the fifth hole section 612 to prevent the branch pipe 20 from protruding from the end cover 60 can

As shown in FIG. 18 , the diameter of the fourth hole section 611 is equal to or greater than the outer diameter of the branch pipe 20, and the diameter of the fifth hole section 612 is not smaller than the inner diameter of the branch pipe 20. Accordingly, it is possible to ensure that the flow capacity of the pipe assembly 100 is ensured without encountering resistance while the fluid flows from the branch pipe 20 to the fifth hole section 612 .

As shown in FIG. 18 , the end cover 60 further includes a stepped portion 613 . The stepped portion 613 is located between the fourth hole section 611 and the fifth hole section 612 . An end of the branch pipe 20 abuts against the stepped portion 613 . The stepped portion 613 may restrict insertion of the branch pipe 20 into the fifth hole section 612 .

As shown in FIG. 18, along the axial direction of the second connection hole 61, the length of the fourth hole section 611 is greater than 1/3 of the length of the end cover 60. Specifically, the fourth hole section 611 has a length L1 along the axial direction of the second connection hole 61 is a length L2 along the axial direction of the second connection hole 61 of the end cover 60 greater than 1/3 of That is, L1 > 1/3L2. Therefore, it is possible to ensure that the branch pipe 20 is firmly fixed on the end cover 60, and the connection between the branch pipe 20 and the end cover 60 is not firm, thereby preventing a problem of shaking or the like from occurring.

19 and 20 illustrate an embodiment in which the end cover 60 fixedly connects the pipe member 101 and the branch pipe 20 according to another embodiment of the present application. The branch pipe 20 includes an insertion portion 21 and an external extension portion 22 . The outer diameter of the insertion portion 21 is smaller than the outer diameter of the outer extension portion 22 . Also, between the insertion part 21 and the outer extension part 22 is a tapered surface transition, and the outer extension part 22 can be hooked into the fourth hole section 611 . Through the engaging action of the external extension 22 and the fourth hole section 611, the branch pipe 20 may be inserted into the fourth hole section 611 to limit the length. Specifically, when the branch pipe 20 is inserted into a certain position of the fourth hole section 611, the external extension part 22 is in contact with the edge point of the end cover 60, so that the branch pipe 20 is Further insertion into the 4-hole section 611 may be restricted. Here, after inserting the insertion part 21 into the second connection hole 61, the two may be fixed through a welding method. In order to ensure fixing quality, it is necessary to ensure that the length of insertion of the insertion part 21 is not smaller than 1/3 of the length along the axial direction of the fourth hole section 611 of the end cover 60.

As shown in FIG. 19 , the length of the insertion part 21 along the axial direction of the fourth hole section 611 is less than or equal to the length along the axial direction of the second connection hole 61 of the end cover 60 . Therefore, it is possible to prevent the insertion portion 21 of the branch pipe 20 from penetrating the second connection hole 61 .

[Example 4]

21 to 27 are structural diagrams of a pipe assembly according to a fourth embodiment of the present application.

As shown in FIG. 21, specifically, the gas collection pipe assembly 100 includes a pipe member 101, a plurality of branch pipes 20, a multi-channel pipe 41, and/or a first bend pipe (not shown). do. The material of the pipe member 101 is stainless steel. The length of at least one branch pipe 20 in the plurality of branch pipes 20 is 50 mm or more. The material of the branch pipe 20 having a length of 50 mm or more is stainless steel, and is connected to the pipe member 101 by welding. And/or one end of at least one branch pipe 20 of the plurality of branch pipes 20 communicates with the pipe member 101 and is connected to the pipe member 101 by welding. The other end communicates with the multi-channel pipe 41 or the first bend pipe, and the material of the at least one branch pipe 20 is stainless steel. When the length of the branch pipe 20 is not smaller than 50 mm, the material of the branch pipe 20 adopts stainless steel, and when the branch pipe 20 is connected to the multi-channel pipe 41 or the first bend pipe, the branch pipe 20 ) It can be understood that the material adopts stainless steel. Through this, problems of copper pipe softening and deformation occurring when the branch pipe 20 is too long or when the branch pipe 20 and the pipe member 101 are welded to each other with pipes of different materials are prevented.

In this embodiment, the first bend is composed of a plurality of long and bent branch pipes.

In addition, the material of the branch pipe 20 (the length of the branch pipe 20 is less than 50 mm or is not connected to the multi-channel pipe 41 or the first bend pipe) is copper, but is not limited to copper. For example, the material of the remaining branch pipe 20 may be stainless steel or a combination of copper and stainless steel.

In one embodiment, a bend pipe 30 is extended at one end of the pipe member 101. The material of the bend pipe 30 is stainless steel. That is, the pipe material at the bending point of the pipe member 101 is made of stainless steel so that the pipe member 101 can be easily bent and molded integrally. It also improves the hardness of the connection point.

21 to 23, a plurality of third connection holes 15 are formed on the outer wall of the pipe member 101. Some branch pipes 20 among the plurality of branch pipes 20 are fixed in a one-to-one correspondence in the third connection hole 15 . Accordingly, some refrigerant in the pipe member 101 flows into the pipe member 101 from the branch pipe 20 .

As shown in FIG. 22, in one embodiment, a positioning unit 23 is installed on one end of the outer wall where the branch pipe 20 and the pipe member 101 are connected. The positioning unit 23 protrudes from the outer wall of the branch pipe 20 along the radial direction of the branch pipe 20 . When the branch pipe 20 is mounted in the third connection hole 15, the positioning unit 23 may come into contact with the outer wall of the pipe member 101. It can be understood that the positioning unit 23 is installed on the outer wall of the branch pipe 20. When the branch pipe 20 extends into the third connection hole 15 and is connected to the pipe member 101, the positioning unit 23 may come into contact with the outer wall of the pipe member 101 to perform a position limiting action. Through this, the branch pipe 20 is prevented from being inserted too deeply into the pipe member 101.

In addition, a plurality of protrusions 16 are further installed on the outer wall of the pipe member 101 . One third connection hole 15 is opened in each protrusion 16 . A positioning unit 23 is installed on the outer wall of the branch pipe 20 . When the branch pipe 20 extends into the third connection hole 15 and is connected to the pipe member 101, the positioning unit 23 may come into contact with the protrusion 16 to perform a position limiting action.

As shown in FIG. 23, in one embodiment, an insertion connection section 24 is installed at one end where the branch pipe 20 and the pipe member 101 are connected. An inclined surface 25 is provided on the outer surface of the insertion connection section 24 . Pipe assembly 100 includes a weld ring 70 . The welding ring 70 is installed to cover the point of the inclined surface 25 of the insertion connection section 24, and may come into contact with the outer wall of the pipe member 101. It can be understood that the installation of the inclined surface 25 serves as a guide, and by matching and using the welding ring 70, the welding ring 70 can contact the large diameter end of the inclined surface 25. Of course, the insertion connection section 24 may be connected so that one end far from the pipe member 101 is transitioned by another structure such as a stepped surface.

In addition, a plurality of protrusions 16 are further installed on the outer wall of the pipe member 101 . On each protrusion 16, one third connection hole 15 is opened to correspond. The welding ring 70 is installed to cover the outer wall of the inclined surface 25 . When the branch pipe 20 extends into the third connection hole 15 and is connected to the pipe member 101, the welding ring 70 may come into contact with the protrusion 16 to perform a position limiting action.

As shown in FIG. 24, a groove opening 241 is also provided in the circumferential direction of the outer wall of the insertion section 24. When the groove opening 241 is used for welding the pipe member 101 and the branch pipe 20, it receives solder to prevent the solder from falling into the pipe member 101 through the gap during welding.

Preferably, the groove opening 241 includes a plurality. A plurality of groove openings 241 are spaced apart along the circumferential direction of the insertion connection section 24 . The width of each groove opening 241 extends along the axial direction of the insertion connection section 24 . It can be understood that by providing the plurality of groove openings 241, the solder can be more sufficiently accommodated, and the solder can be further prevented from falling into the pipe member 101 through the gap during welding.

Of course, in another embodiment, the width of each groove opening 241 extends along the circumferential direction of the insertion connection section 24, or extends along the circumferential direction of the insertion connection section 24 and the axis of the insertion connection section 24. It may extend along the direction. That is, the width of each groove opening 241 may extend in a spiral manner.

In one embodiment, a gap fit is adopted between the branch pipe 20 and the pipe member 101. The clearance value is 0.01mm to 0.1mm, and it is easy to penetrate the solder to ensure that there is no problem of loosening and falling off during welding. Alternatively, an interference fit is adopted between the branch pipe 20 and the pipe member 101. The branch pipe 20 has a drawing pattern (not shown), and it is possible to ensure that the branch pipe 20 is assembled more firmly through an intermediate fit.

25 and 26, in one embodiment, a necking section 26 is provided at one end where the branch pipe 20 and the multi-channel pipe 41 are connected. The necking section 26 is inserted into and connected to the multi-channel pipe 41 to implement a connection between the branch pipe 20 and the multi-channel pipe 41.

Preferably, a capillary action surface (not shown) is provided in the circumferential direction of the outer wall of the necking section 26. The capillary action surface forms mesh pattern concave grooves through scoring. Of course, the capillary action surface may form concave grooves of other shapes. For example, the capillary action surface forms straight, inclined, bent, or wavy concave grooves through scoring. In another embodiment, the capillary action surface is roughened by grinding. By providing the capillary action surface, the roughness in the circumferential direction of the outer wall of the necking section 26 can be increased to make the connection more intimate.

As shown in FIG. 27, in another embodiment, a flaring section 27 is provided at one end where the branch pipe 20 and the multi-channel pipe 41 are connected. The multi-channel pipe 41 is inserted into and connected to the flaring section 27, so that the branch pipe 20 and the multi-channel pipe 41 can be connected.

In the pipe assembly 100 provided in this application, when the length of the branch pipe 20 is not smaller than 50 mm, the material of the branch pipe 20 is stainless steel, and the branch pipe 20 is a multi-channel pipe 41 Or when connected to the first bend pipe, the material of the branch pipe 20 adopts stainless steel. Through this, problems of copper pipe softening and deformation occurring when the branch pipe 20 is too long or when the branch pipe 20 and the pipe member 101 are welded to each other with pipes of different materials are prevented. In addition, the connection hardness between the branch pipe 20 and the multi-channel pipe 41 is improved and the cost is lowered.

The technical features of the foregoing embodiments may be arbitrarily combined. For concise description, all possible combinations of technical features according to the foregoing embodiments have not been described, but as long as there is no contradiction in the combinations of technical features, they should all be considered within the scope described in the present invention.

The foregoing embodiments represent various embodiments of the present application, and the description is relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present application. It should be noted that those skilled in the art to which the present invention pertains may make modifications and improvements without departing from the spirit of the present application, all of which fall within the protection scope of the present application. Therefore, the scope of protection of the patent of this application is based on the appended claims.

Claims (40)

In the pipe member,
Including a main body, a plurality of through holes spaced apart from each other are opened on a side surface of the main body, a boss is installed at a hole opening point of the through hole, and a flange hole is opened in a cross section of the boss far from the through hole, and the flange hole A pipe member characterized in that communicates with the through hole. According to claim 1,
The boss is a pipe member having a flat cross section away from the main body. According to claim 1,
The boss has an arc surface at a cross section far from the main body, and the absolute value (H) of the height difference between the center point of the arc surface and the end points of both ends of the arc surface along the axial direction of the flange hole is 1 mm or less. According to claim 1,
An arc portion is provided between the main body and the boss, one end of the arc portion is connected to the boss, and the other end is connected to the main body. According to claim 4,
The arc degree range of the arc-shaped portion is a pipe member of 0.5 to 4. According to claim 4,
The arc degree range of the arc-shaped portion is a pipe member of 2 to 3.5. According to claim 1,
The pipe member according to claim 1, wherein the body is a stainless steel body and the boss is a stainless steel boss. A pipe assembly comprising the pipe member according to any one of claims 1 to 7. According to claim 8,
The pipe assembly includes a plurality of branch pipes, each of the plurality of branch pipes is connected to the pipe member, and the branch pipes are copper branch pipes. According to claim 8,
A pipe member and a bend pipe connected to an end of the pipe member, wherein the pipe assembly includes a connection sleeve, one end of the connection sleeve is connected to the bend pipe, and a first connection hole is installed at the other end of the connection sleeve. , The outer circumferential wall of the pipe member and the connection hole are intermediately fitted or press-fitted, thereby fixing and connecting the connection sleeve and the pipe member. According to claim 10,
The first connection hole includes a first hole section and a second hole section, the pipe member is sequentially inserted into the first hole section and the second hole section, and the pipe member and the first hole section are The pipe assembly is intermediately fitted, and the pipe member and the second hole section are press-fitted. According to claim 11,
Along the axial direction of the first connection hole, the length of the second hole section is 1/3 or less of the length of the first connection hole pipe assembly. According to claim 12,
The first hole section is a tapered hole, the second hole section is a tapered hole, and the taper angles of the tapered holes of the first hole section and the tapered holes of the second hole section are both 10 degrees or less Pipe assembly. According to claim 13,
The first connection hole further includes a third hole section, the third hole section is installed between the first hole section and the second hole section, the third hole section is a circular hole, and the third hole section is provided. The diameter of the circular hole of the section is equal to the diameter of the small diameter end of the first hole section, and the diameter of the circular hole of the third hole section is equal to the diameter of the large diameter end of the second hole section. According to claim 12,
The first hole section is a tapered hole, the taper angle of the tapered hole of the first hole section is 10 degrees or less, the second hole section is a circular hole, and the diameter of the small diameter end of the first hole section is A pipe assembly equal to the diameter of the round hole in the two-hole section. According to claim 12,
Wherein the first hole section is a circular hole, the second hole section is a circular hole, and the diameter of the second hole section is greater than the diameter of the second hole section. According to claim 16,
The first connection hole further includes a third hole section, the third hole section is installed between the first hole section and the second hole section, the third hole section is a tapered hole, and the third hole section is a tapered hole. The diameter of the large diameter end of the tapered hole in the hole section is equal to the diameter of the circular hole in the first hole section, and the diameter of the small diameter end of the tapered hole in the third hole section is equal to the diameter of the circular hole in the second hole section Pipe assembly . According to claim 12,
The first hole section is a circular hole, the second hole section is a tapered hole, the taper angle of the tapered hole of the second hole section is 10 degrees or less, and the diameter of the circular hole of the first hole section is the first Pipe assemblies that are equal to or greater than the diameter of the large diameter end of the tapered hole in the two-hole section. According to any one of claims 10 to 18,
The pipe assembly further comprises at least one locating bubble, the locating bubble being concave inwardly along an outer surface of the connecting sleeve. According to claim 8,
It includes a pipe member and a branch pipe, wherein the pipe assembly further includes an end cover, and at least one second connection hole penetrating the end cover is installed in the end cover, and one end of the branch pipe is installed in the end cover. The pipe assembly is fixed to the second connection hole, and the outer circumferential wall of the end cover is intermediately fitted or press-fitted with the inner circumferential wall of the pipe member to fix and communicate the pipe member and the branch pipe. According to claim 20,
The second connection hole includes a fourth hole section and a fifth hole section, a diameter of the fourth hole section is greater than a diameter of the fifth hole section, and the branch pipe is a pipe fixed to the fourth hole section. assembly. According to claim 21,
The diameter of the fifth hole section is greater than or equal to the inner diameter of the branch pipe assembly. According to claim 21,
The end cover further includes a stepped portion, the stepped portion is located between the fourth hole section and the fifth hole section, and an end of the branch pipe abuts on the stepped portion. According to claim 21,
Along the axial direction of the connection hole, the length of the fourth hole section is greater than 1/3 of the length of the end cover pipe assembly. According to claim 20,
The branch pipe includes an insertion portion and an external extension, an outer diameter of the insertion portion is smaller than an outer diameter of the outer extension, a tapered surface transition between the insertion portion and the external extension, and the outer extension portion comprises the second A pipe assembly that can be hooked into a connecting hole. According to claim 25,
A length of the insertion portion along the axial direction of the second connection hole is less than or equal to a length of the end cover pipe assembly. The method of claim 21 or 25,
The end cover further includes a flange installed on one end surface of the end cover, and a diameter of the flange is greater than or equal to an inner diameter of the pipe member. The method of claim 27,
A pipe assembly in which an arc angle is installed between the other end surface of the end cover and the outer circumferential wall of the end cover. According to claim 20,
The end cover is a stainless steel end cover pipe assembly. According to claim 8,
A pipe member, a plurality of branch pipes, a multi-channel pipe or a first bend pipe, wherein the pipe member material is stainless steel,
The length of at least one of the branch pipes in the plurality of branch pipes is 50 mm or more, and the material of the branch pipe having a length of 50 mm or more is stainless steel and is connected to the pipe member by welding; and/or
One end of at least one of the plurality of branch pipes communicates with the pipe member and is connected to the pipe member by welding, and the other end communicates with the multi-channel pipe or the first bend pipe, and Pipe assembly where the outlet is stainless steel. 31. The method of claim 30,
A pipe assembly wherein a bend pipe is extended at one end of the pipe member, and the material of the bend pipe is stainless steel. 31. The method of claim 30,
There is a clearance fit between the branch pipe and the pipe member, and the clearance value is 0.01 to 0.1 mm; or
A pipe assembly that is press-fitted between the branch pipe and the pipe member. 31. The method of claim 30,
A pipe assembly wherein a plurality of third connection holes are opened on an outer wall of the pipe member, and some of the plurality of branch pipes are fixed in a one-to-one correspondence within the third connection holes. 34. The method of claim 33,
A positioning unit is installed on an outer wall of one end where the branch pipe and the pipe member are connected, the positioning unit protrudes from the outer wall of the branch pipe along a radial direction of the branch pipe, and the branch pipe is mounted in the connecting hole. When it is, the positioning unit pipe assembly that can come into contact with the outer wall of the pipe member. 34. The method of claim 33,
An insertion connection section is installed at one end where the branch pipe and the pipe member are connected, and the insertion connection section and the branch pipe are connected so as to be transitioned by an inclined surface,
The pipe assembly includes a welding ring, the welding ring is installed to cover the inclined surface point, and can come into contact with the outer wall of the pipe member. 31. The method of claim 30,
A pipe assembly wherein a necking section is provided at one end where the branch pipe and the multi-channel pipe are connected, and the necking section can be inserted into the multi-channel pipe. 31. The method of claim 30,
A pipe assembly wherein a flaring section is provided at one end where the branch pipe and the multi-channel pipe are connected, and the multi-channel pipe can be inserted into and connected to the flaring section. The method of claim 35,
A groove opening is provided in a circumferential direction of an outer wall of the insertion connection section, and the groove opening is used for solder welding. 37. The method of claim 36,
A pipe assembly in which a capillary action surface is installed in the circumferential direction of the outer wall of the necking section. A heat exchanger comprising a pipe assembly according to any one of claims 8 to 39.

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