Heat exchanger

Abstract

The heat exchanger comprises a distribution guide pipe and a heat exchange core body, the heat exchange core body comprises a mounting plate and a first pipe connector, the first pipe connector is arranged on the mounting plate, the heat exchange core body is provided with a first hole channel, at least part of the distribution guide pipe is located in the first hole channel, and the first pipe connector forms part of the first hole channel. And the first pipe joint is fixedly connected with the distribution guide pipe. According to the distribution guide pipe, in the actual application process, due to the fact that the first pipe connector is arranged on the installation plate of the heat exchange core body and forms part of the first hole channel, and at least part of the distribution guide pipe is located in the first hole channel of the heat exchange core body, installation and fixation of the distribution guide pipe can be completed by fixedly connecting the distribution guide pipe with the first pipe connector; the structure is simple and operation is very convenient.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange technology, and more particularly to a heat exchanger. Background Art

[0002] The heat exchanger includes a multi-layer inter-plate channel and a first hole channel. The inter-plate channel is used for refrigerant circulation, and the first hole channel is used for refrigerant to flow into the heat exchanger. At present, a distribution conduit with multiple small holes is usually added to the first hole channel, so that the refrigerant can be distributed more evenly to each inter-plate channel after secondary distribution through the small holes on the distribution conduit. However, the installation structure of the existing distribution conduit of the heat exchanger is mostly complicated.

[0003] In summary, how to solve the problem of the complex installation structure of the distribution conduit has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, the present invention provides a heat exchanger to solve the problem of complex installation structure of the distribution conduit.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A heat exchanger includes a distribution duct and a heat exchange core, wherein the heat exchange core includes a mounting plate and a first pipe joint, wherein the first pipe joint is arranged on the mounting plate, and the heat exchange core has a first channel, wherein at least part of the distribution duct is located in the first channel, the first pipe joint forms part of the first channel, and the first pipe joint is fixedly connected to the distribution duct.

[0007] In the heat exchanger of the above embodiment, a first pipe joint is provided on the mounting plate of the heat exchange core, and the first pipe joint forms part of the first channel, and at least part of the distribution duct is located in the first channel of the heat exchange core. The distribution duct can be installed and fixed by fixing it to the first pipe joint. The structure is simple and the operation is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 A schematic diagram of the axial structure of a distribution conduit provided in an embodiment of the present invention;

[0010] Figure 2A schematic diagram of the main structure of a distribution conduit provided by an embodiment of the present invention;

[0011] Figure 3 for Figure 2 AA cross-sectional structural diagram;

[0012] Figure 4 A schematic diagram of the axial structure of the distribution conduit provided by an embodiment of the present invention installed on a heat exchanger;

[0013] Figure 5 A schematic diagram of a top view of a distribution conduit provided in an embodiment of the present invention installed on a heat exchanger;

[0014] Figure 6 for Figure 5 BB cross-sectional structure diagram;

[0015] Figure 7 A schematic diagram of a first pipe joint and a mounting plate as an integrated structure provided in an embodiment of the present invention;

[0016] Figure 8 A schematic structural diagram of a heat exchanger provided in an embodiment of the present invention in which a first pipe joint is not installed on a fluid medium inlet;

[0017] Fig. 9 A schematic cross-sectional structural diagram of a first pipe joint provided in an embodiment of the present invention.

[0018] in, Figure 1-Figure 9 middle:

[0019] Distribution conduit 1, pipe body 11, distribution hole 110, fluid inlet end 111, closed bottom end 112, second pipe joint 12, error prevention part 120, wrench position 121, external thread 122, external end side 123;

[0020] First pipe joint 2, internal thread 21;

[0021] The heat exchange core 3 , the core portion 30 , the fluid medium inlet 31 , the mounting plate 32 , the bottom plate 33 , the plate 34 , the top plate 35 , the first fluid channel 36 , the second fluid channel 37 , and the first hole 38 . DETAILED DESCRIPTION

[0022] The core of the present invention is to provide a heat exchanger to solve the problem of complex installation structure of the distribution conduit.

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Reference Figure 1-Figure 3 Combination Figure 4-Figure 6 As shown, the present invention provides a heat exchanger, including a distribution pipe 1 and a heat exchange core 3 , wherein the heat exchange core 3 includes a mounting plate 32 and a first pipe joint 2 .

[0025] Among them, the mounting plate 32 is mainly used to facilitate the installation of the heat exchanger; the first pipe joint 2 is arranged on the mounting plate 32, and the first pipe joint 2 and the mounting plate 32 can be specifically designed as a split fixed connection structure, such as the first pipe joint 2 and the mounting plate 32 are connected by a split welding method. This split fixed connection structure of the first pipe joint 2 and the mounting plate 32 facilitates the molding of the first pipe joint 2 and the mounting plate 32, and the welding connection of the first pipe joint 2 and the mounting plate 32 is stable. In other embodiments, the first pipe joint 2 and the mounting plate 32 can also be designed as other split structures, such as the first pipe joint 2 and the mounting plate 32 are threaded or clamped. The mounting plate 32 can be designed to be located at the top of the heat exchanger or at the bottom of the heat exchanger. Of course, it is understandable that the first pipe joint 2 and the mounting plate 32 can also be designed as an integrated structure, such as an integrated molding method. In actual application, the configuration can be selected according to actual needs.

[0026] In addition, the heat exchange core 3 has a first hole 38 , at least a portion of the distribution conduit 1 is located in the first hole 38 , the first pipe joint 2 forms a portion of the first hole 38 , and the first pipe joint 2 is fixedly connected to the distribution conduit 1 .

[0027] It should be noted that those skilled in the art should be able to understand the basic working principle and structure of the heat exchanger. In addition to the mounting plate 32, its structure generally also includes a core portion 30. The core portion 30 includes a plurality of plates 34, a bottom plate 33 and a top plate 35. The plurality of plates 34 are stacked and arranged, and a heat exchange channel is formed between two adjacent plates 34. The bottom plate 33 is arranged below the bottom plate 34, and the top plate 35 is arranged above the top plate 34. When the mounting plate 32 is arranged at the top of the heat exchanger, the top plate 35 is located between the mounting plate 32 and the top plate 34. When the mounting plate 32 is arranged at the bottom of the heat exchanger, the bottom plate 33 is located between the mounting plate 32 and the bottom plate 34. Among them, one of the two adjacent heat exchange channels is configured as a first fluid channel 36, and the other is configured as a second fluid channel 37. The first fluid channel 36 and the second fluid channel 37 are alternately stacked and arranged, and the first fluid channel 36 and the second fluid channel 37 are not connected to each other. The first fluid channel 36 is used to pass the first fluid medium, such as refrigerant, etc.; the second fluid channel 37 is used to pass the second fluid medium, such as water, etc., and the first fluid medium and the second fluid medium can exchange heat. In addition, in order to ensure that the first fluid channel 36 can realize the circulation of the first fluid medium, the first fluid channel 36 is correspondingly provided with a first channel 38 for the inflow of the first fluid medium and a second channel for the outflow of the first fluid medium. In order to ensure that the second fluid channel 37 can realize the circulation of the second fluid medium, the second fluid channel 37 is correspondingly provided with a third channel for the inflow of the second fluid medium and a fourth channel for the outflow of the second fluid medium.

[0028] In actual application of the above-mentioned heat exchanger, since a first pipe joint 2 is provided on the mounting plate 32 of the heat exchange core 3, the first pipe joint 2 forms part of the first channel 38, and at least part of the distribution conduit 1 is located in the first channel 38 of the heat exchange core 3, the distribution conduit 1 can be installed and fixed by fixing it to the first pipe joint 2, which has a simple structure and is very convenient to operate.

[0029] It should be noted that the distribution conduit 1 can also be installed in the third channel for the second fluid medium to flow in. Its installation structure is similar to the structure of the distribution conduit 1 installed in the first channel 38 mentioned above, and it is mainly used to distribute the second fluid medium.

[0030] In some specific embodiments, reference Figure 1-Figure 3 Combination Figure 4-Figure 6 and Fig. 9As shown, the distribution conduit 1 may specifically include a tube body 11 and a second tube joint 12, wherein the second tube joint 12 is disposed at the fluid inlet end 111 of the tube body 11, and the second tube joint 12 is fixedly connected to the first tube joint 2; wherein the fixed connection may include a threaded connection, an interference fit connection, or a snap connection. By designing the distribution conduit 1 into the above-mentioned structural form, the installation of the distribution conduit 1 is transformed into the connection of two tube joints, which is not only simple in structure and very convenient to operate, but also easier to ensure the accuracy and reliability of the installation position. wherein, by designing the fixed connection between the second tube joint 12 and the first tube joint 2 into a threaded connection structural form, the second tube joint 12 and the first tube joint 2 can be rotated at an adaptive angle according to the needs during the connection and docking process to adjust the directional angle of the distribution hole 110 on the tube body 11 to which the second tube joint 12 is connected, and the angle adjustment is more flexible, which helps to improve the accuracy and reliability of the installation of the distribution conduit 1. Of course, it is understandable that the above-mentioned threaded connection method is only an example of a detachable connection structure in the embodiment of the present invention. In actual application, other detachable connection structures can also be designed, such as locking two pipe joints with a locking nut, bonding or clamping, etc., and the angle can also be adjusted according to needs. In actual application, the configuration can be selected according to actual needs, and no further specific limitation is made here.

[0031] It should be noted that the pipe body 11 and the second pipe joint 12 can be designed as an integrated structure. For example, when the distribution conduit 1 is made of metal, it can be integrally formed by machining or other integral forming methods. For example, when the distribution conduit 1 is made of plastic, it can be injection molded, which is simple to mold and convenient to process. Of course, it is understandable that the pipe body 11 and the second pipe joint 12 can also be designed as a split fixed connection structure, such as a non-detachable connection method of welding connection, or a detachable connection method such as threaded connection. In actual application, it can be configured according to actual needs, and no more specific restrictions are made here.

[0032] It should also be noted that the second pipe joint 12 may also be designed with an external connection structure, which is used to connect to the supply pipeline of the first fluid medium outside the heat exchanger. The specific structure may be designed as shown in FIG. Fig. 9 The structural form shown, that is, the external structure is a groove structure formed on the outer peripheral surface of the second pipe joint 12, which is connected to the pipe joint on the supply pipeline through the groove. Of course, it can also be designed as a structural form of other pipe joint docking, which is not further limited here.

[0033] In some specific embodiments, reference Figure 1-Figure 3The tube body 11 and the second tube joint 12 are preferably designed to be coaxially arranged. By designing this structural form, when the second tube joint 12 is docked with the first tube joint 2, it is more convenient to control the installation angle of the tube body 11 and the insertion is more convenient.

[0034] In some specific implementation schemes, a sealant may be provided in the matching gap between the second pipe joint 12 and the first pipe joint 2. Figure 1-Figure 3 Combination Figure 4-Figure 6 and Fig. 9 As shown, when the second pipe joint 12 and the first pipe joint 2 are threadedly matched, thread glue can also be provided in the corresponding thread matching gap. Specifically, the second pipe joint 12 includes an external thread 122, and the first pipe joint 2 includes an internal thread 21, and the external thread 122 is threadedly matched with the internal thread 21. Before the assembly operation of the second pipe joint 12 and the first pipe joint 2 is performed, a small amount of thread glue can be pre-coated on at least part of the thread matching position of the external thread 122 of the second pipe joint 12 and / or the internal thread 21 of the first pipe joint 2, and then the second pipe joint 12 is screwed into the internal thread of the first pipe joint 2. The screwing method can use tools such as wrenches, or can be directly screwed manually. The assembly of the two is completed when the thread glue solidifies. By providing the sealant, not only can the sealing of the connection between the second pipe joint 12 and the first pipe joint 2 be improved, but also the angle fixation of the distribution conduit 1 can be made more accurate and reliable, and the orientation change or angle deviation of the distribution hole 110 caused by loose threads can be effectively prevented.

[0035] In some specific embodiments, reference Figure 1-Figure 3 Combination Figure 4-Figure 6 The tube body 11 includes a distribution hole 110, which is arranged on the tube wall of the tube body 11. The heat exchange core 3 includes multiple layers of first fluid channels 36 and multiple layers of second fluid channels 37. The distribution holes 110 of the distribution conduit 1 are used to match and communicate with the multiple layers of first fluid channels 36 one by one, that is, the number of the distribution holes 110 is the same as that of the first fluid channels 36, and they are connected one by one, so that the fluid medium can be distributed to each layer of the first fluid channels 36. Of course, it can be understood that when the distribution conduit 1 is also provided in the third channel corresponding to the second fluid channel 37, the distribution holes 110 of the corresponding distribution conduit 1 should also be matched and connected with the multiple layers of second fluid channels 37 one by one, that is, the number of the corresponding distribution holes 110 is the same as that of the second fluid channels 37, and they are connected one by one, so that the fluid medium can be distributed to each layer of the second fluid channels 37.

[0036] In some specific embodiments, reference Figure 1-Figure 3The distribution holes 110 provided on the tube wall of the tube body 11 are preferably designed to be arranged in a straight line along the height direction of the tube body 11. By designing the distribution holes 110 to be arranged in a straight line along the height direction of the tube body 11, it is more convenient to arrange the installation position of the distribution holes 110. Of course, it can be understood that the distribution holes 110 are designed to be arranged in a straight line along the height direction of the tube body 11 only as a preferred example of the embodiment of the present invention. In actual application, they can also be designed to be arranged in a non-linear manner along the height direction of the tube body 11. The configuration can be selected according to actual needs, and no more specific limitations are made here.

[0037] It should be noted that, refer to Figure 1-Figure 3 Combination Figure 6 As shown, the tube body 11 may include a closed bottom end 112, and the closed bottom end 112 may be designed to have a first preset assembly gap with the bottom plate 33. By designing this structural form, it is more convenient to adjust the position of the tube body 11. For example, when the second pipe joint 12 and the first pipe joint 2 are threaded, due to the existence of the first preset assembly gap, the second pipe joint 12 has a certain operating margin when rotating relative to the first pipe joint 2. Of course, it is understandable that in actual application, the closed bottom end 112 and the bottom plate 33 may also be designed to be in contact with each other. The advantage of this structural form is that the contact and abutment between the tube body 11 and the bottom plate 33 can make the distribution conduit 1 more convenient to install, easier to determine the installation position, and the structure after installation is more stable and reliable.

[0038] In a further embodiment, the distribution conduit 1 may further include an anti-mistake portion 120, which may be located at the top of the distribution conduit 1 or at the outer wall of the distribution conduit 1. In this case, the distribution holes 110 are preferably designed to be arranged in a straight line along the height direction of the tube body 11, and the anti-mistake portion 120 is aligned with the distribution holes 110, so that the installation position of the distribution holes 110 can be identified. The anti-mistake portion 120 is designed to match the anti-mistake matching structure corresponding to the anti-mistake portion 120 at the corresponding position of the mounting plate 32 or the first pipe joint 2. When the anti-mistake portion 120 is aligned with the anti-mistake matching structure, it indicates that the position is found. This anti-mistake structure makes it easier for the operator to quickly find the required assembly position during the assembly operation. The anti-mistake portion 120 can be specifically designed on the outer end face of the second pipe joint 12, or it can be designed at a position close to the outer end face of the second pipe joint 12, as long as it is convenient for the operator to observe.

[0039] It should be noted that the above-mentioned error prevention part 120 can be specifically configured as a convex part, a concave part or a coating mark, etc. The convex part includes a first convex structure and / or a second convex structure, the first convex structure is configured to be formed by a local convexity from the top surface of the distribution conduit 1 to the side away from the top surface, and the second convex structure is configured to be formed by a local convexity from the peripheral wall of the distribution conduit 1 to the side away from the peripheral wall; the concave part includes a first concave structure and / or a second concave structure, the first concave structure is configured to be formed by a local concaveity from the top surface of the distribution conduit 1, and the second concave structure is configured to be formed by a local concaveity from the peripheral wall of the distribution conduit 1. The specific shape of the error prevention part 120 is not limited. For example, refer to Figure 1 As shown, the "1"-shaped protrusion or groove, or a line, a bump, etc., has the same direction as the distribution hole 110 along the circumferential direction, as long as the marking anti-error portion 120 can assist the operator in accurately identifying and ensuring the setting position of the distribution hole 110.

[0040] In some more specific embodiments, the distribution conduit 1 may further include a wrench position 121, which is arranged on the outer end side 123 of the second pipe joint 12, and the wrench position 121 is used to match with a wrench tool, so as to adjust the assembly angle of the second pipe joint 12 and the first pipe joint 2. Among them, the wrench position 121 can be specifically configured as at least one of anti-skid patterns, anti-skid convex points and rotation-limiting surfaces. Of course, the wrench position 121 can also be designed as other structural forms, mainly to match with a wrench tool. By designing the wrench position 121, the second pipe joint 12 is more convenient to operate when the thread rotates relative to the first pipe joint 2.

[0041] In some other specific embodiments, there may be a second preset assembly gap between the outer tube wall of the tube body 11 and the hole wall of the first hole 38. By designing the second preset assembly gap, the first fluid medium is distributed once through the distribution hole 110 on the tube body 11 of the distribution conduit 1 and enters the second assembly gap. The first fluid medium enters the first hole 38 after secondary distribution from the second preset assembly gap. After entering the second preset assembly gap, the first fluid medium can be secondary distributed, which helps to improve the uniformity of distribution. Of course, it is understandable that the outer tube wall of the tube body 11 and the hole wall of the first hole 38 can also be designed to be in a contact setting mode. This contact setting mode makes the structure of the tube body 11 more stable and reliable after installation.

[0042] It should be noted that, refer to Figure 6-Figure 9As shown, in the actual assembly process of the above heat exchanger, the bottom plate 33, the multi-layer plate 34 and the top plate 35 can be stacked in sequence, and then assembled with the mounting plate 32 and the first pipe joint 2, and the whole can be put into a brazing furnace for brazing, and then the distribution duct 1 can be assembled with the first pipe joint 2. Of course, it is also possible to stack the mounting plate 32, the top plate 35, the multi-layer plate 34 and the bottom plate 33 in sequence and then put them into a brazing furnace for welding to form the heat exchange core 3, and then assemble the first pipe joint 2 and the mounting plate 32 separately, and then assemble the distribution duct 1 with the first pipe joint 2; or the distribution duct 1 and the first pipe joint 2 are assembled and then assembled with the heat exchange core 3. Alternatively, the mounting plate 32 and the first pipe joint 2 are an integral structure, and the core part 30 formed by stacking the top plate 35, the multi-layer plate 34 and the bottom plate 33 in sequence and brazing is assembled with the integral structure, and then the distribution duct 1 is assembled to the first pipe joint 2. In addition, the outer periphery of the first pipe joint 2 may be provided with external threads, the corner holes of the mounting plate 32 may be provided with internal threads, the first pipe joint 2 or the mounting plate 32 may be coated with sealant, and the first pipe joint 2 and the mounting plate 32 may be threadedly connected.

[0043] In addition, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0044] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0045] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0047] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A heat exchanger, characterized in that: The invention comprises a distribution conduit (1) and a heat exchange core (3), wherein the heat exchange core (3) comprises a mounting plate (32) and a first pipe joint (2), wherein the first pipe joint (2) is arranged on the mounting plate (32), the heat exchange core (3) has a first hole (38), at least part of the distribution conduit (1) is located in the first hole (38), the first pipe joint (2) forms part of the first hole (38), and the first pipe joint (2) is fixedly connected to the distribution conduit (1).

2. The heat exchanger according to claim 1, characterized in that The distribution conduit (1) comprises a pipe body (11) and a second pipe joint (12), wherein the second pipe joint (12) is arranged at a fluid inlet end (111) of the pipe body (11), and the second pipe joint (12) is fixedly connected to the first pipe joint (2); Wherein, the fixed connection includes a threaded connection, an interference fit connection or a snap connection.

3. The heat exchanger according to claim 2, characterized in that A sealant is also provided in the fitting gap between the second pipe joint (12) and the first pipe joint (2).

4. The heat exchanger according to claim 2 or 3, characterized in that: The second pipe joint (12) comprises an external thread (122), the first pipe joint (2) comprises an internal thread (21), and the external thread (122) is threadably matched with the internal thread (21).

5. The heat exchanger according to claim 4, characterized in that The tube body (11) comprises a distribution hole (110), and the distribution hole (110) is arranged on the tube wall of the tube body (11). The heat exchange core (3) comprises a plurality of first fluid channels (36) and a plurality of second fluid channels (37). The first fluid channels (36) and the second fluid channels (37) are alternately stacked, and the first fluid channels (36) and the second fluid channels (37) are not connected to each other. The distribution hole (110) is used to match and connect with the plurality of first fluid channels (36) one by one to distribute fluid medium to each layer of the first fluid channels (36).

6. The heat exchanger according to claim 5, characterized in that The heat exchange core (3) comprises a core portion (30), the core portion (30) comprises a plurality of plates (34), the plurality of plates (34) are arranged in a stacked manner, and a heat exchange channel is formed between two adjacent plates (34); Among them, one of the two adjacent heat exchange channels is configured as the first fluid channel (36), and the other is configured as the second fluid channel (37).

7. The heat exchanger according to claim 6, characterized in that The tube body (11) includes a closed bottom end (112), and the core portion (30) includes a bottom plate (33) and a top plate (35), wherein the bottom plate (33) is arranged below the bottommost plate (34), and the top plate (35) is arranged above the topmost plate (34), and the closed bottom end (112) and the bottom plate (33) have a first preset assembly gap or contact setting.

8. The heat exchanger according to any one of claims 5 to 7, characterized in that: The distribution conduit (1) comprises an anti-error portion (120), the anti-error portion (120) being located at the top end and / or the outer peripheral wall of the distribution conduit (1), the distribution holes (110) being arranged in a straight line along the height direction of the tube body (11), and the anti-error portion (120) being arranged in alignment with the distribution holes (110) for identifying the installation orientation of the distribution holes (110); Wherein, the anti-error portion (120) is configured as a convex portion, a concave portion or a coating mark, the convex portion includes a first convex structure and / or a second convex structure, the first convex structure is configured to be locally convex from the top end surface of the distribution conduit (1) to the side away from the top end surface, and the second convex structure is configured to be locally convex from the peripheral wall of the distribution conduit (1) to the side away from the peripheral wall; the concave portion includes a first concave structure and / or a second concave structure, the first concave structure is configured to be locally concave from the top end surface of the distribution conduit (1), and the second concave structure is configured to be locally concave from the peripheral wall of the distribution conduit (1).

9. The heat exchanger according to claim 8, characterized in that The distribution conduit (1) comprises a wrench position (121), which is arranged on the outer end side (123) of the second pipe joint (12), and the wrench position (121) is used to match a wrench tool to facilitate adjustment of the assembly angle of the second pipe joint (12) and the first pipe joint (2).

10. The heat exchanger according to claim 9, characterized in that A second preset assembly gap or contact setting is provided between the outer tube wall of the tube body (11) and the hole wall of the first hole channel (38).

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