CN219064275U - Collecting pipe welding structure and heat exchanger - Google Patents

Abstract

The application relates to a collecting pipe welding structure, this collecting pipe welding structure include first takeover, second takeover and soldered connection, and the soldered connection includes first grafting section, second grafting section and welded section, and the soldered connection is integrated into one piece structure. The welding section protrudes out of the first inserting section along the radial direction of the welding head and forms a first annular step surface close to the first inserting section, one end of the first connecting pipe is sleeved on the first inserting section and stops on the first annular step surface, and the end surface of the first connecting pipe is welded with the first annular step surface in a sealing mode. The welding section protrudes out of the second inserting section along the radial direction of the welding head and forms a second annular step surface close to the second inserting section, one end of the second connecting pipe is sleeved on the second inserting section and stops on the second annular step surface, and the end surface of the second connecting pipe is welded with the second annular step surface in a sealing mode. The utility model provides a pressure manifold welded structure and heat exchanger has solved current pressure manifold and has been difficult to satisfy the problem that the leak source easily detects and the installation is fixed simple and convenient simultaneously.

Description

Collecting pipe welding structure and heat exchanger

Technical Field

The application relates to the technical field of pipeline connection, in particular to a collecting pipe welding structure and a heat exchanger.

Background

In the technical field of new energy automobiles, a partition plate is usually inserted into different positions in the same collecting pipe respectively, and the partition plate is welded with the inner wall of the collecting pipe, so that the collecting pipe is divided into a plurality of independent sections which are not communicated with each other, and the independent sections are respectively communicated with different heat exchange loops. However, since the separator is provided inside the header, it is impossible to detect whether there is a leak at the welded portion of the separator and the inner wall of the header by the conventional nondestructive inspection apparatus.

In order to solve the problem that the leakage point cannot be detected, a method of using an independent collecting pipe for each flow channel is generally adopted. However, each individual manifold requires a separate fastener for attachment, thereby greatly increasing the complexity of the manifold attachment.

Disclosure of Invention

Based on this, it is necessary to provide a header welding structure and a heat exchanger, which solve the problems that the existing header is difficult to simultaneously satisfy the easy detection of the leakage point and the installation and fixation are simple and convenient.

The utility model provides a pressure manifold welded structure includes first takeover, second takeover and connects the soldered connection that first takeover and second takeover, and the soldered connection includes first grafting section, second grafting section and connects the welding section of first grafting section and second grafting section, and first grafting section, second grafting section and welding section are integrated into one piece structure. The welding section protrudes out of the first inserting section along the radial direction of the welding head and forms a first annular step surface close to the first inserting section, one end of the first connecting pipe is sleeved on the first inserting section and is stopped on the first annular step surface, and the end surface of the first connecting pipe close to the first annular step surface and the first annular step surface are welded in a sealing mode so as to seal an opening of the corresponding end of the first connecting pipe. The welding section protrudes out of the second inserting section along the radial direction of the welding head and forms a second annular step surface close to the second inserting section, one end of the second connecting pipe is sleeved on the second inserting section and is stopped on the second annular step surface, and the end surface, close to the second annular step surface, of the second connecting pipe is welded with the second annular step surface in a sealing mode so as to seal an opening of the corresponding end of the second connecting pipe.

In one embodiment, the first plugging section is provided with a first rotation stopping protrusion protruding radially along the first plugging section, the first connecting pipe is provided with a first bayonet corresponding to the first rotation stopping protrusion, and the first rotation stopping protrusion is inserted into the first bayonet along the radial direction of the first plugging section, so that the first rotation stopping protrusion is fixedly clamped and matched with the inner wall of the first bayonet along the circumferential direction of the first plugging section.

In one embodiment, one end of the first rotation stopping protrusion is connected to the first annular step surface of the welding section, the other end of the first rotation stopping protrusion extends along the axial direction of the first inserting section towards a direction away from the first annular step surface, and the length of the first rotation stopping protrusion extending along the axial direction of the first inserting section is smaller than the axial length of the first inserting section.

In one embodiment, the first bayonet penetrates through the side wall of the first connecting pipe along the radial direction of the first connecting pipe, and the side wall of the first bayonet and the side wall of the first rotation stopping protrusion are welded in a sealing mode.

In one embodiment, the second insertion section is provided with a second rotation stopping protrusion protruding radially along the second insertion section, the second connection pipe is provided with a second bayonet corresponding to the second rotation stopping protrusion, and the second rotation stopping protrusion is inserted into the second bayonet along the radial direction of the second insertion section, so that the second rotation stopping protrusion is fixedly clamped and matched with the inner wall of the second bayonet along the circumferential direction of the second insertion section.

In one embodiment, one end of the second rotation stopping protrusion is connected to the second annular step surface of the welding section, the other end of the second rotation stopping protrusion extends along the axial direction of the second inserting section towards a direction away from the second annular step surface, and the length of the second rotation stopping protrusion extending along the axial direction of the second inserting section is smaller than the axial length of the second inserting section.

In one embodiment, the second bayonet penetrates through the side wall of the second connecting pipe along the radial direction of the second connecting pipe, and the side wall of the second bayonet and the side wall of the second rotation stopping protrusion are welded in a sealing mode.

In one embodiment, the first plugging section is in a triangular prism shape, and the first connecting pipe is in a triangular prism shape corresponding to the first plugging section; or the first connecting pipe is in a quadrangular prism shape corresponding to the first connecting section;

and/or the second splicing section is in a triangular prism shape, and the second connecting pipe is in a triangular prism shape corresponding to the second splicing section; or the second connecting pipe is in a quadrangular shape corresponding to the second connecting section.

In one embodiment, the height of the welding section protruding from the first plug section in the radial direction of the welding head is greater than or equal to the wall thickness of the first connecting tube.

And/or the height of the welding section protruding out of the second inserting section along the radial direction of the welding head is larger than or equal to the wall thickness of the second connecting pipe.

The application also provides a heat exchanger, which comprises the collecting pipe welding structure in any embodiment.

Compared with the prior art, the collecting pipe welding structure and the heat exchanger provided by the application have the advantages that as the first connecting pipe and the second connecting pipe are welded through the welding head, the first connecting pipe and the second connecting pipe are not required to be independently fixed by arranging the fastener for each connecting pipe, and only any one of the first connecting pipe and the second connecting pipe is required to be fixed, so that the whole collecting pipe welding structure can be installed and fixed.

Further, one end of the first connecting pipe is sleeved on the first inserting section and is stopped on the first annular step surface, and the end surface of the first connecting pipe, which is close to the first annular step surface, is welded with the first annular step surface in a sealing manner. Therefore, when a leakage point is generated at the welding position of the end face of the first connecting pipe and the first annular step face, leaked medium can enter the outer side of the first connecting pipe from the inside of the first connecting pipe through the leakage point. And, because the first grafting section, second grafting section and welded segment are integrated into one piece structure again, consequently, the welding head does not have the leakage point by oneself, and the medium in the first takeover can not pass through the welding head and then in the second takeover, that is to say, the medium in the first takeover can only enter into the outside of first takeover through the welded part between first takeover and the first annular step face. In this way, the detection of the leak point at the sealed weld of the first connection piece becomes very simple, even without the aid of specialized detection equipment, and the specific location of the leak can be known only by visual inspection.

Similarly, one end of the second connecting pipe is sleeved on the second inserting section and is stopped on the second annular step surface, and the end surface of the second connecting pipe, which is close to the second annular step surface, is welded with the second annular step surface in a sealing way. Therefore, when a leakage point is generated at the welding position of the end face of the second connecting pipe and the second annular step face, leaked medium can enter the outer side of the second connecting pipe from the inside of the second connecting pipe through the leakage point. And, because the first grafting section, second grafting section and welded segment are integrated into one piece structure again, consequently, the welding head does not have the leakage point by oneself, and the medium in the second takeover can not pass through the welding head and then in the first takeover, that is to say, the medium in the second takeover can only enter into the outside of second takeover through the welded part between second takeover and the second annular step face. In this way, the detection of the leak at the sealed weld of the second connection tube becomes very simple, even without the aid of specialized detection equipment, and the specific location of the leak can be known only by visual inspection.

In sum, the collecting pipe welding structure effectively solves the problems that the existing collecting pipe is difficult to meet the requirement of easily detecting leakage points and is simple and convenient to install and fix.

Drawings

In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings that are required to be used in the description of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is an exploded view of a heat exchanger according to an embodiment provided herein;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a cross-sectional view of a header welding structure according to one embodiment provided herein;

fig. 4 is an exploded view of a header welding structure of another embodiment provided herein.

Reference numerals: 1000. a collecting pipe welding structure; 100. a first connection pipe; 110. a first bayonet; 200. a second connection pipe; 210. a second bayonet; 300. a welding head; 310. a first plug section; 311. a first rotation stopping protrusion; 320. a second plug section; 321. a second rotation stopping protrusion; 330. a welding section; 331. a first annular step surface; 332. a second annular step surface.

Detailed Description

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

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. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the technical field of new energy automobiles, a partition plate is usually inserted into different positions in the same collecting pipe respectively, and the partition plate is welded with the inner wall of the collecting pipe, so that the collecting pipe is divided into a plurality of independent sections which are not communicated with each other, and the independent sections are respectively communicated with different heat exchange loops. However, since the separator is provided inside the header, it is impossible to detect whether there is a leak at the welded portion of the separator and the inner wall of the header by the conventional nondestructive inspection apparatus.

In order to solve the problem that the leakage point cannot be detected, a method of using an independent collecting pipe for each flow channel is generally adopted. However, each individual manifold requires a separate fastener for attachment, thereby greatly increasing the complexity of the manifold attachment.

Referring to fig. 1-4, in order to solve the problems that the existing collecting pipe is difficult to meet the requirement of easily detecting the leakage point and is simple and convenient to install and fix, the application provides a collecting pipe welding structure 1000, the collecting pipe welding structure 1000 comprises a first connecting pipe 100, a second connecting pipe 200 and a welding head 300 for connecting the first connecting pipe 100 and the second connecting pipe 200, the welding head 300 comprises a first inserting section 310, a second inserting section 320 and a welding section 330 for connecting the first inserting section 310 and the second inserting section 320, and the first inserting section 310, the second inserting section 320 and the welding section 330 are integrally formed. The welding section 330 protrudes out of the first inserting section 310 along the radial direction of the welding head 300 and forms a first annular step surface 331 close to the first inserting section 310, one end of the first connecting pipe 100 is sleeved on the first inserting section 310 and stops on the first annular step surface 331, and the end surface of the first connecting pipe 100 close to the first annular step surface 331 and the first annular step surface 331 are sealed and welded to seal an opening of a corresponding end of the first connecting pipe 100. The welding section 330 protrudes out of the second plugging section 320 along the radial direction of the welding head 300 and forms a second annular step surface 332 close to the second plugging section 320, one end of the second connecting pipe 200 is sleeved on the second plugging section 320 and stops against the second annular step surface 332, and the end surface of the second connecting pipe 200 close to the second annular step surface 332 and the second annular step surface 332 are sealed and welded to seal the opening of the corresponding end of the second connecting pipe 200.

Incidentally, the "seal weld" refers to a weld where the end face of the first adapter tube 100 and the first annular step surface 331 form an annular shape in the circumferential direction, and a weld where the end face of the second adapter tube 200 and the second annular step surface 332 form an annular shape in the circumferential direction.

Since the first connection pipe 100 and the second connection pipe 200 are welded by the welding head 300, it is not necessary to separately provide a fastener for each connection pipe to fix, and only any one of the first connection pipe 100 and the second connection pipe 200 needs to be fixed, so that the whole header welding structure 1000 can be installed and fixed.

Further, since one end of the first connecting tube 100 is sleeved on the first inserting section 310 and stops against the first annular step surface 331, and the end surface of the first connecting tube 100 close to the first annular step surface 331 is welded with the first annular step surface 331 in a sealing manner. Therefore, when a leak point is generated at the welded portion of the end surface of the first adapter tube 100 and the first annular step surface 331, the leaked medium can enter the outside of the first adapter tube 100 from within the first adapter tube 100 through the leak point. Moreover, since the first socket section 310, the second socket section 320 and the welding section 330 are integrally formed, there is no leakage point in the welding head 300 itself, that is, the medium in the first adapter tube 100 cannot pass through the welding head 300 and then the second adapter tube 200, that is, the medium in the first adapter tube 100 can only enter the outside of the first adapter tube 100 through the welding position between the first adapter tube 100 and the first annular step surface 331. In this way, the detection of the leak at the sealing weld of the first adapter tube 100 becomes very simple, even without the aid of specialized detection equipment, and the specific location of the leak can be known only by visual inspection.

Similarly, since one end of the second connecting tube 200 is sleeved on the second plug section 320 and stops against the second annular step surface 332, and the end surface of the second connecting tube 200 close to the second annular step surface 332 is welded with the second annular step surface 332 in a sealing manner. Therefore, when a leakage point is generated at the welded portion of the end surface of the second adapter tube 200 and the second annular step surface 332, the leaked medium can enter the outside of the second adapter tube 200 from within the second adapter tube 200 through the leakage point. Moreover, since the first socket section 310, the second socket section 320 and the welding section 330 are integrally formed, there is no leakage point in the welding head 300 itself, that is, the medium in the second adapter tube 200 cannot pass through the welding head 300 and thus the first adapter tube 100, that is, the medium in the second adapter tube 200 can only enter the outer side of the second adapter tube 200 through the welding point between the second adapter tube 200 and the second annular step surface 332. In this way, the detection of the leakage point at the sealing weld of the second adapter tube 200 becomes very simple, even without the aid of specialized detection equipment, and the specific location of the leakage can be known only by visual inspection.

It can be seen from the above that, the collecting pipe welding structure 1000 provided by the application effectively solves the problems that the existing collecting pipe is difficult to simultaneously meet the requirement that the leakage point is easy to detect and the installation is simple and convenient.

Specifically, in one embodiment, the welding head 300 is a metal piece, and the welding head 300 is formed by a turning process, which is beneficial to improving the structural strength of the welding head 300. However, in other embodiments, the welding head 300 may be formed by a casting process, which is beneficial to reducing the difficulty of manufacturing the welding head 300.

In one embodiment, as shown in fig. 3, the height of the welding segment 330 protruding from the first socket segment 310 along the radial direction of the welding head 300 is greater than or equal to the wall thickness of the first adapter tube 100.

In this way, it is advantageous to increase the welding area at the port of the first adapter tube 100 and to facilitate the detection of the leakage point at the welding by the detection device.

Likewise, in one embodiment, as shown in FIG. 3, the height of the weld segment 330 protruding from the second socket segment 320 along the radial direction of the weld head 300 is greater than or equal to the wall thickness of the second adapter tube 200.

In this way, it is advantageous to increase the welding area at the port of the second adapter tube 200 and to facilitate the detection of the leakage point at the welding by the detection device.

In one embodiment, the first adapter tube 100 and the first socket segment 310 are threadedly engaged, and the second adapter tube 200 and the second socket segment 320 are threadedly engaged.

In an embodiment, as shown in fig. 2, the first socket section 310 is provided with a first rotation stopping protrusion 311 protruding along a radial direction thereof, the first adapter 100 is provided with a first bayonet 110 corresponding to the first rotation stopping protrusion 311, and the first rotation stopping protrusion 311 is inserted into the first bayonet 110 along the radial direction of the first socket section 310, so that the first rotation stopping protrusion 311 is fixedly and clamped with an inner wall of the first bayonet 110 along the circumferential direction of the first socket section 310.

In this way, the first connecting tube 100 can be prevented from rotating relative to the first inserting section 310, which is beneficial to improving the welding firmness of the first connecting tube 100 and the welding head 300.

Further, in an embodiment, as shown in fig. 2, one end of the first rotation stopping protrusion 311 is connected to the first annular step surface 331 of the welding section 330, the other end extends along the axial direction of the first inserting section 310 in a direction away from the first annular step surface 331, and the length of the first rotation stopping protrusion 311 extending along the axial direction of the first inserting section 310 is smaller than the axial length of the first inserting section 310.

In this way, the structural strength of the first rotation stopping protrusion 311 is improved.

Still further, in an embodiment, a plurality of first rotation stopping protrusions 311 are disposed at intervals along the circumference of the first socket section 310.

Further, in an embodiment, as shown in fig. 2, the first bayonet 110 penetrates through the sidewall of the first adapter tube 100 along the radial direction of the first adapter tube 100, and the sidewall of the first bayonet 110 and the sidewall of the first rotation stopping protrusion 311 are welded in a sealing manner.

In this way, leakage at the junction of the first rotation stopping protrusion 311 and the first bayonet 110 can be avoided.

Similarly, in an embodiment, as shown in fig. 2, the second socket section 320 is provided with a second rotation stopping protrusion 321 protruding along a radial direction of the second socket section 320, and the second adapter 200 is provided with a second bayonet 210 corresponding to the second rotation stopping protrusion 321, and the second rotation stopping protrusion 321 is inserted into the second bayonet 210 along the radial direction of the second socket section 320, so that the second rotation stopping protrusion 321 is fixedly clamped and matched with an inner wall of the second bayonet 210 along the circumferential direction of the second socket section 320.

In this way, the second connection pipe 200 can be prevented from rotating relative to the second socket section 320, which is beneficial to improving the welding firmness of the second connection pipe 200 and the welding head 300.

Further, in an embodiment, as shown in fig. 2, one end of the second rotation stopping protrusion 321 is connected to the second annular step surface 332 of the welding section 330, the other end extends along the axial direction of the second plug section 320 in a direction away from the second annular step surface 332, and the length of the second rotation stopping protrusion 321 extending along the axial direction of the second plug section 320 is smaller than the axial length of the second plug section 320.

In this way, the structural strength of the second rotation stopping protrusion 321 is improved.

Further, in an embodiment, a plurality of second rotation stopping protrusions 321 are disposed at intervals along the circumference of the second socket section 320.

Further, in an embodiment, as shown in fig. 2, the second bayonet 210 penetrates the sidewall of the second adapter tube 200 along the radial direction of the second adapter tube 200, and the sidewall of the second bayonet 210 and the sidewall of the second rotation stopping protrusion 321 are welded in a sealing manner.

In this way, leakage at the junction of the second rotation stopping protrusion 321 and the second bayonet 210 can be avoided.

However, in other embodiments, as shown in fig. 4, the first socket section 310 may be further configured in a triangular prism shape, a quadrangular prism shape, or other polygonal column shapes, and correspondingly, the first adapter 100 may be configured in a triangular prism shape, a quadrangular prism shape, or other polygonal column shapes. And, the second socket section 320 may be further configured in a triangular prism shape, a quadrangular prism shape, or other polygonal column shape, and correspondingly, the second connection pipe 200 may be configured in a triangular prism shape, a quadrangular prism shape, or other polygonal column shape.

In this way, the first adapter tube 100 is prevented from rotating relative to the welding head 300, and the second adapter tube 200 is prevented from rotating relative to the welding head 300.

The present application also provides a heat exchanger comprising the header welding structure 1000 of any one of the above embodiments.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of the present application is to be determined by the following claims.

Claims (10)

1. The utility model provides a header welding structure which is characterized in that, including first takeover (100), second takeover (200) and connect first takeover (100) with welded joint (300) of second takeover (200), welded joint (300) include first grafting section (310), second grafting section (320) and connect first grafting section (310) with welded section (330) of second grafting section (320), and first grafting section (310), second grafting section (320) and welded section (330) are integrated into one piece structure;

the welding section (330) protrudes out of the first inserting section (310) along the radial direction of the welding head (300) and forms a first annular step surface (331) close to the first inserting section (310), one end of the first connecting pipe (100) is sleeved on the first inserting section (310) and stops against the first annular step surface (331), and the end surface, close to the first annular step surface (331), of the first connecting pipe (100) and the first annular step surface (331) are subjected to sealing welding so as to seal an opening of the corresponding end of the first connecting pipe (100);

the welding section (330) protrudes out of the second inserting section (320) along the radial direction of the welding head (300) and forms a second annular step surface (332) close to the second inserting section (320), one end of the second connecting pipe (200) is sleeved on the second inserting section (320) and stops against the second annular step surface (332), and the end surface, close to the second annular step surface (332), of the second connecting pipe (200) and the second annular step surface (332) are welded in a sealing mode so as to seal the opening of the corresponding end of the second connecting pipe (200).

2. Header welding structure according to claim 1, characterized in that the first insertion section (310) is provided with a first rotation stopping protrusion (311) protruding radially along itself, the first adapter tube (100) is provided with a first bayonet (110) corresponding to the first rotation stopping protrusion (311), and the first rotation stopping protrusion (311) is inserted into the first bayonet (110) along the radial direction of the first insertion section (310), so that the first rotation stopping protrusion (311) is fixedly clamped and matched with the inner wall of the first bayonet (110) along the circumferential direction of the first insertion section (310).

3. The header welding structure according to claim 2, wherein the first rotation stopping protrusion (311) has one end connected to a first annular step surface (331) of the welding section (330), the other end extending in a direction away from the first annular step surface (331) along an axial direction of the first insertion section (310), and a length of the first rotation stopping protrusion (311) extending in the axial direction of the first insertion section (310) is smaller than an axial length of the first insertion section (310).

4. Header welding structure according to claim 2, characterized in that the first bayonet (110) penetrates the side wall of the first adapter tube (100) along the radial direction of the first adapter tube (100), and the side wall of the first bayonet (110) and the side wall of the first rotation stopping protrusion (311) are welded in a sealing manner.

5. Header welding structure according to claim 1, characterized in that the second insertion section (320) is provided with a second rotation stopping protrusion (321) protruding radially along itself, the second connection tube (200) is provided with a second bayonet (210) corresponding to the second rotation stopping protrusion (321), and the second rotation stopping protrusion (321) is inserted into the second bayonet (210) along the radial direction of the second insertion section (320), so that the second rotation stopping protrusion (321) is fixedly clamped and matched with the inner wall of the second bayonet (210) along the circumferential direction of the second insertion section (320).

6. The header welding structure according to claim 5, wherein one end of the second rotation stopping protrusion (321) is connected to a second annular step surface (332) of the welding section (330), the other end extends along the axial direction of the second insertion section (320) toward a direction away from the second annular step surface (332), and the length of the second rotation stopping protrusion (321) extending along the axial direction of the second insertion section (320) is smaller than the axial length of the second insertion section (320).

7. The header welding structure according to claim 5, wherein the second bayonet (210) penetrates a sidewall of the second adapter tube (200) in a radial direction of the second adapter tube (200), and a sidewall of the second bayonet (210) and a sidewall of the second rotation stopping protrusion (321) are sealed and welded.

8. The header welding structure according to claim 1, wherein the first insertion section (310) has a triangular prism shape, and the first connection pipe (100) has a triangular prism shape corresponding to the first insertion section (310); alternatively, the first plug section (310) has a quadrangular prism shape, and the first connecting tube (100) has a quadrangular prism shape corresponding to the first plug section (310);

and/or, the second plug-in section (320) is in a triangular prism shape, and the second connecting pipe (200) is in a triangular prism shape corresponding to the second plug-in section (320); alternatively, the second connecting section (320) has a quadrangular prism shape, and the second connecting tube (200) has a quadrangular prism shape corresponding to the second connecting section (320).

9. The header welding structure according to claim 1, wherein a height of the welding section (330) protruding from the first insertion section (310) in a radial direction of the welding head (300) is greater than or equal to a wall thickness of the first connection pipe (100);

and/or the height of the welding section (330) protruding out of the second plug section (320) along the radial direction of the welding head (300) is greater than or equal to the wall thickness of the second connecting pipe (200).

10. A heat exchanger comprising a header welding structure (1000) according to any one of claims 1-9.

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