Brazing structure for capillary heat exchanger and capillary heat exchanger
By incorporating internal brazing grooves into the inner and outer tube sheet structures of the capillary heat exchanger, the problems of uneven brazing and defects are solved, thereby improving brazing quality and heat transfer performance and reducing the risk of leakage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHUTIAN HUATONG PHARM EQUIP CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-04-28
AI Technical Summary
Existing capillary heat exchangers are prone to uneven brazing or defects during the brazing process, leading to leaks, and the flow of brazing filler metal affects the appearance quality and heat transfer performance.
The design employs an inner and outer tube sheet structure, with the brazing filler groove located inside the component. The brazing filler groove is positioned at the contact point between the inner and outer tube sheets and the heat exchange tubes, ensuring that the brazing filler filler is filled inside the component and preventing it from flowing to the outside.
It effectively solved the problems of uneven brazing and defects, improved brazing quality, reduced leakage risk, and improved appearance and heat transfer performance.
Smart Images
Figure CN224168946U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of capillary heat exchanger technology, and in particular to a brazing structure for a capillary heat exchanger and a capillary heat exchanger. Background Technology
[0002] When brazing existing capillary heat exchangers, due to the small diameter of the capillary tubes, the welding is usually completed by applying brazing filler metal to the outside of the component connection.
[0003] However, this brazing method is prone to uneven brazing or defects, which can lead to heat exchanger leaks. Furthermore, when brazing with filler metal applied externally, the filler metal can flow onto the outer surface of the heat exchanger, affecting its appearance and sometimes even welding capillary tubes together, thus negatively impacting the heat transfer performance and leak detection. Utility Model Content
[0004] In view of this, the purpose of this application is to provide a brazing structure and a capillary heat exchanger for a capillary heat exchanger, so as to solve the problem of how to braze a capillary heat exchanger.
[0005] According to a first aspect of the present invention, a brazing structure for a capillary heat exchanger is provided, wherein the brazing structure for the capillary heat exchanger includes: a cylindrical body in which a plurality of heat exchange tubes are inserted; an inner tube plate sleeved at the end of the cylindrical body, wherein the heat exchange tubes are inserted through the inner tube plate, and a first brazing groove is provided inside the inner tube plate at the contact point with the heat exchange tubes; and an outer tube plate installed at the end of the inner tube plate away from the cylindrical body, wherein the heat exchange tubes are inserted through the outer tube plate, and a second brazing groove is provided inside the outer tube plate at the contact point with the heat exchange tubes, and a third brazing groove is provided between the outer tube plate and the inner tube plate.
[0006] Preferably, the inner tube sheet includes: an inner tube sheet body, a first end of which is sleeved on the end of the cylinder, a second end of which is provided with a first cylindrical groove, the bottom of which is provided with a plurality of first tube holes for the heat exchange tubes to pass through, and a first brazing groove formed on the outer periphery of the first tube holes; and an inner tube sheet brazing plate, which is installed in the first cylindrical groove, the heat exchange tubes passing through the inner tube sheet brazing plate, and the first brazing groove being sandwiched between the inner tube sheet brazing plate and the inner tube sheet body.
[0007] Preferably, the outer tube sheet includes: an outer tube sheet brazing plate, a first end portion of which extends into the first cylindrical groove, and the heat exchange tube passing through the outer tube sheet brazing plate; and an outer tube sheet body, on the side facing the outer tube sheet brazing plate, a second cylindrical groove is formed, the bottom of which is provided with a plurality of second tube holes for the heat exchange tube to pass through, the second brazing groove is formed on the outer periphery of the second tube holes, the outer tube sheet body is sleeved on the second end of the outer tube sheet brazing plate, and the second brazing groove is sandwiched between the outer tube sheet brazing plate and the outer tube sheet body.
[0008] Preferably, the inner tube sheet brazing plate is disposed at the bottom of the first cylindrical groove, and a fourth brazing groove is provided on the side wall of the first cylindrical groove at the location corresponding to the inner tube sheet brazing plate.
[0009] Preferably, the first end of the outer tube sheet brazing plate is in contact with the inner tube sheet brazing plate, and the sidewall of the first cylindrical groove is provided with the third brazing groove at the first end corresponding to the outer tube sheet brazing plate.
[0010] Preferably, the second end of the brazing plate of the outer tube sheet is in contact with the bottom of the second cylindrical groove, and a fifth brazing groove is provided on the side wall of the second cylindrical groove at the contact point with the brazing plate of the outer tube sheet.
[0011] Preferably, a sixth brazing groove is provided at the first end of the inner tube sheet body at the contact point with the cylinder.
[0012] Preferably, the brazing structure for the capillary heat exchanger further includes a connecting pipe, an opening is provided on the side wall of the inner tube sheet body, the first end of the connecting pipe is inserted into the opening, and a seventh brazing groove is provided at the contact point between the first end of the connecting pipe and the opening.
[0013] Preferably, the outer periphery of the first end of the connector is chamfered, and the seventh brazing groove is provided at the chamfer.
[0014] According to a second aspect of the present invention, a capillary heat exchanger is provided, wherein the capillary heat exchanger includes the brazed structure for a capillary heat exchanger as described above.
[0015] This utility model discloses a brazing structure for a capillary heat exchanger and a capillary heat exchanger in which multiple heat exchange tubes are inserted into a cylindrical body. An inner tube sheet is fitted onto the end of the cylindrical body, and the heat exchange tubes pass through the inner tube sheet. A first brazing groove is provided inside the inner tube sheet at the contact point with the heat exchange tubes. An outer tube sheet is installed at the end of the inner tube sheet away from the cylindrical body, and the heat exchange tubes pass through the outer tube sheet. A second brazing groove is provided inside the outer tube sheet at the contact point with the heat exchange tubes. A third brazing groove is provided between the outer tube sheet and the inner tube sheet. This design places the brazing filler metal on the inner side of the components, reducing the risk of brazing filler metal flowing to the outer side of the components, ensuring more complete filling of the gaps between the components, and reducing the risk of brazing defects. This effectively solves the problem of how to braze a capillary heat exchanger.
[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the brazing structure for a capillary heat exchanger according to the present invention.
[0019] Figure 2 This is a partially enlarged view of the brazing structure for a capillary heat exchanger according to this utility model.
[0020] Figure 3 This is a schematic diagram of a capillary heat exchanger according to the present invention.
[0021] Reference numerals in the attached drawings: 1-Cylinder; 2-Inner tube sheet; 21-Inner tube sheet body; 22-Inner tube sheet brazing plate; 3-Outer tube sheet; 31-Outer tube sheet body; 32-Outer tube sheet brazing plate; 4-Heat exchange tube; 5-Connecting pipe; 100-First brazing filler groove; 200-Second brazing filler groove; 300-Third brazing filler groove; 400-Fourth brazing filler groove; 500-Fifth brazing filler groove; 600-Sixth brazing filler groove; 700-Seventh brazing filler groove. Detailed Implementation
[0022] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.
[0023] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.
[0024] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.
[0025] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.
[0026] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.
[0027] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.
[0028] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.
[0029] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.
[0030] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.
[0031] like Figures 1 to 3 As shown, according to a first aspect of the present invention, a brazing structure for a capillary heat exchanger is provided, the brazing structure for the capillary heat exchanger including a cylinder 1, an inner tube sheet 2 and an outer tube sheet 3.
[0032] In the following description, reference will be made to Figures 1 to 3 The specific structure of the above-mentioned components used in the brazing structure of the capillary heat exchanger and the connection relationship of the above-mentioned components are described in detail.
[0033] like Figures 1 to 3As shown, in this embodiment, a plurality of heat exchange tubes 4 can be inserted into the cylinder 1. An inner tube plate 2 can be sleeved on the end of the cylinder 1, and the heat exchange tubes 4 pass through the inner tube plate 2. A first brazing groove 100 can be formed inside the inner tube plate 2 at the contact point with the heat exchange tubes 4 to braze and fix the heat exchange tubes 4 to the inner tube plate 2. An outer tube plate 3 is installed at the end of the inner tube plate 2 away from the cylinder 1, and the heat exchange tubes 4 pass through the outer tube plate 3. A second brazing groove 200 can be provided inside the outer tube plate 3 at the contact point with the heat exchange tubes 4 to braze and fix the heat exchange tubes 4 to the outer tube plate 3. Additionally, a third brazing groove 300 can be provided between the outer tube plate 3 and the inner tube plate 2 to braze and fix the outer tube plate 3 to the inner tube plate 2. This design allows the brazing filler metal to be trapped inside the parts, reducing the risk of brazing filler metal flowing to the outside of the parts, ensuring more complete filling of the gaps between the parts, and reducing the risk of brazing defects.
[0034] Preferred, such as Figure 1 and Figure 2 As shown, in this embodiment, the inner tube sheet 2 may further include an inner tube sheet body 21 and an inner tube sheet brazing plate 22. The inner tube sheet body 21 may be a cylindrical structure, and the first end of the inner tube sheet body 21 (e.g., Figure 2 The lower end shown can be an open end, and the second end of the inner tube sheet body 21 (as shown) can be an open end. Figure 2 The upper end shown can be a closed end. The inner tube sheet brazing plate 22 can be a circular plate.
[0035] Specifically, the first end of the inner tube sheet body 21 can be sleeved on the end of the cylinder 1. The second end of the inner tube sheet body 21, on the side away from the cylinder 1, can be provided with a first cylindrical groove. The bottom of the first cylindrical groove has multiple first tube holes. These first tube holes communicate with the interior of the inner tube sheet body 21 and are used for the passage of the heat exchange tube 4. A first brazing groove 100 can be formed around the outer periphery of the first tube holes to facilitate the fixing of the heat exchange tube 4. The inner tube sheet brazing plate 22 can be installed in the first cylindrical groove, such that the first brazing groove 100 is sandwiched between the inner tube sheet brazing plate 22 and the inner tube sheet body 21 to prevent brazing filler metal from flowing to the outside of the component. The inner tube sheet brazing plate 22 can also have tube holes, through which the heat exchange tube 4 passes.
[0036] Furthermore, preferably, such as Figure 1 and Figure 2As shown, in this embodiment, the thickness of the inner tube sheet brazing plate 22 is less than the depth of the first cylindrical groove. The inner tube sheet brazing plate 22 can be disposed at the bottom of the first cylindrical groove, that is, the bottom surface of the inner tube sheet brazing plate 22 is in contact with the bottom surface of the first cylindrical groove. This arrangement can reduce the gap between the inner tube sheet brazing plate 22 and the inner tube sheet body 21, and prevent the brazing filler metal in the first brazing filler metal groove 100 from flowing to the outside of the part. In addition, the sidewall of the inner tube sheet brazing plate 22 can be in contact with the sidewall of the first cylindrical groove. The sidewall of the first cylindrical groove can be provided with an annular fourth brazing filler metal groove 400 at the corresponding position of the inner tube sheet brazing plate 22, so as to braze and fix the inner tube sheet brazing plate 22 to the inner tube sheet body 21.
[0037] Preferred, such as Figure 1 and Figure 2 As shown, in this embodiment, the outer tube sheet 3 may include an outer tube sheet brazing plate 32 and an outer tube sheet body 31. The outer tube sheet brazing plate 32 may be a cylindrical structure. The first end of the outer tube sheet brazing plate 32 (e.g., Figure 2 The lower end shown can be an open end, and the second end of the outer tube sheet brazing plate 32 (as shown) can be an open end. Figure 2 The upper end shown can be a closed end. The outer tube sheet body 31 can be approximately a plate-like structure, and the outer tube sheet body 31 can cover the second end of the outer tube sheet brazing plate 32.
[0038] Specifically, the first end of the outer tube sheet brazing plate 32 can partially extend into the first cylindrical groove, and a tube hole is formed at the second end of the outer tube sheet brazing plate 32, through which the heat exchange tube 4 passes. The outer tube sheet body 31 can form a second cylindrical groove on the side facing the outer tube sheet brazing plate 32. Multiple second tube holes are formed at the bottom of the second cylindrical groove. The second tube holes penetrate both ends of the outer tube sheet body 31, and the heat exchange tube 4 passes through the second tube holes. A second brazing filler groove 200 can be formed around the outer periphery of the second tube holes to facilitate the fixing of the heat exchange tube 4. The outer tube sheet body 31 can be fitted onto the second end of the outer tube sheet brazing plate 32 through the second cylindrical groove, so that the second brazing filler groove 200 is sandwiched between the outer tube sheet brazing plate 32 and the outer tube sheet body 31 to prevent brazing filler from flowing to the outside of the part.
[0039] Furthermore, preferably, such as Figure 1 and Figure 2As shown, in this embodiment, the second end of the outer tube sheet brazing plate 32 can contact the bottom of the second cylindrical groove. This arrangement reduces the gap between the inner and outer tube sheet brazing plates 22 and the outer tube sheet body 31, preventing the brazing filler metal in the second brazing filler groove 200 from flowing to the outside of the part. Additionally, the sidewall of the outer tube sheet brazing plate 32 can contact the sidewall of the second cylindrical groove. A fifth annular brazing filler groove 500 can be formed at the contact point between the sidewall of the second cylindrical groove and the outer tube sheet brazing plate 32 to braze and fix the outer tube sheet brazing plate 32 to the outer tube sheet body 31.
[0040] Further optimized, such as Figure 1 and Figure 2 As shown, in this embodiment, the first end of the outer tube sheet brazing plate 32 can contact the upper surface of the inner tube sheet brazing plate 22. Additionally, the sidewall of the outer tube sheet brazing plate 32 can contact the sidewall of the first cylindrical groove. The sidewall of the first cylindrical groove can have an annular third brazing groove 300 at the corresponding first end of the outer tube sheet brazing plate 32 to braze and fix the inner tube sheet 2 and the outer tube sheet 3.
[0041] In addition, preferred, such as Figure 1 and Figure 2 As shown, in this embodiment, the cylinder 1 can partially extend into the first end of the inner tube sheet body 21, and the end of the cylinder 1 contacts the inner wall of the first end of the inner tube sheet body 21. The first end of the inner tube sheet body 21 may have an annular sixth brazing groove 600 at the contact point with the cylinder 1 to braze and fix the inner tube sheet 2 and the cylinder 1.
[0042] Preferred, such as Figures 1 to 3 As shown, in this embodiment, the brazing structure for the capillary heat exchanger may further include a connecting pipe 5, which can be a pipe fitting communicating with the interior of the inner tube sheet 2. Specifically, an opening may be provided on the side wall of the inner tube sheet body 21. The first end of the connecting pipe 5 (e.g. Figure 2 The left end shown can be inserted into the opening to install the connector 5 onto the inner tube sheet body 21. A seventh brazing groove 700 can be provided at the contact point between the first end of the connector 5 and the opening.
[0043] Specifically, such as Figure 2As shown, in this embodiment, the connector 5 can be inserted radially into the opening along the inner tube sheet body 21. A stop structure can be provided within the opening to position the connector 5. After insertion into the opening, the outer wall of the connector 5 contacts the inner tube sheet body 21. An annular seventh brazing groove 700 can be formed at the contact point between the inner tube sheet body 21 and the outer wall of the connector 5. Furthermore, a chamfer can be provided on the outer periphery of the first end of the connector 5 on the outer wall of both the inner tube sheet body 21 and the connector 5, and an annular seventh brazing groove 700 can also be formed at the chamfer. This effectively brazes and fixes the inner tube sheet body 21 and the connector 5.
[0044] In addition, such as Figures 1 to 3 As shown, according to a second aspect of the present invention, a capillary heat exchanger is provided, the capillary heat exchanger comprising the brazed structure for a capillary heat exchanger as described above.
[0045] During use, the capillary heat exchanger can be assembled from bottom to top. First, the outer tube sheet body 31 located at the bottom of the capillary heat exchanger can be placed. Then, the heat exchange tubes 4 are inserted into the second tube hole, and then brazing filler metal is applied to the second brazing filler groove 200 and the fifth brazing filler groove 500. Next, the outer tube sheet brazing plate 32 is placed into the second cylindrical groove. Subsequently, the inner tube sheet brazing plate 22 is placed on the outer tube sheet brazing plate 32. After applying brazing filler metal to the first brazing filler groove 100, the fourth brazing filler groove 400, and the third brazing filler groove 300, the inner tube sheet body 21 is installed on the inner tube sheet brazing plate 22. After applying brazing filler metal to the sixth brazing filler groove 600, the bottom end of the cylinder 1 is inserted into the inner tube sheet body 21.
[0046] The inner tube sheet 2 and outer tube sheet 3, located at the top of the cylinder 1, are installed using a similar method. Specifically, after filling the sixth brazing groove 600 with brazing filler metal, the inner tube sheet body 21 is fitted onto the top of the cylinder 1. Then, the first brazing groove 100, the fourth brazing groove 400, and the third brazing groove 300 are filled with brazing filler metal, and the inner tube sheet brazing plate 22 is placed into the first cylindrical groove. Subsequently, the outer tube sheet brazing plate 32 is placed on the inner tube sheet brazing plate 22. Then, the second brazing groove 200 and the fifth brazing groove 500 are filled with brazing filler metal, and the outer tube sheet body 31 is fitted onto the outer tube sheet brazing plate 32.
[0047] During this installation process, the capillary heat exchanger is assembled from bottom to top, thereby compacting and expelling air from the joints between components. The capillary heat exchanger uses a concealed placement method for the brazing filler metal, which makes it easier for the filler metal to fill the gaps between components and reduces the risk of the filler metal flowing to the outside of the components.
[0048] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.
Claims
1. A brazing structure for a capillary heat exchanger, characterized in that, The brazing structure for the capillary heat exchanger includes: The cylindrical body contains multiple heat exchange tubes; An inner tube sheet is sleeved at the end of the cylinder, and the heat exchange tubes pass through the inner tube sheet. A first brazing groove is provided inside the inner tube sheet at the contact point with the heat exchange tubes. An outer tube sheet is installed at the end of the inner tube sheet away from the cylinder. The heat exchange tube passes through the outer tube sheet. A second brazing groove is provided inside the outer tube sheet at the contact point with the heat exchange tube. A third brazing groove is provided between the outer tube sheet and the inner tube sheet.
2. The brazing structure for a capillary heat exchanger according to claim 1, characterized in that, The inner tube sheet includes: An inner tube sheet body, the first end of which is sleeved on the end of the cylinder, and the second end of which is provided with a first cylindrical groove, the bottom of which is provided with a plurality of first tube holes for the heat exchange tubes to pass through, and a first brazing filler groove is formed on the outer periphery of the first tube holes; and The inner tube sheet brazing plate is installed in the first cylindrical groove, the heat exchange tube passes through the inner tube sheet brazing plate, and the first brazing groove is sandwiched between the inner tube sheet brazing plate and the inner tube sheet body.
3. The brazing structure for a capillary heat exchanger according to claim 2, characterized in that, The outer tube sheet includes: An outer tube sheet brazing plate, wherein a first end portion of the outer tube sheet brazing plate extends into the first cylindrical groove, and the heat exchange tubes pass through the outer tube sheet brazing plate; and The outer tube sheet body has a second cylindrical groove formed on the side facing the outer tube sheet brazing plate. The bottom of the cylindrical groove is provided with a plurality of second tube holes for the heat exchange tubes to pass through. The second brazing groove is opened on the outer periphery of the second tube holes. The outer tube sheet body is sleeved on the second end of the outer tube sheet brazing plate, and the second brazing groove is sandwiched between the outer tube sheet brazing plate and the outer tube sheet body.
4. The brazing structure for a capillary heat exchanger according to claim 3, characterized in that, The inner tube sheet brazing plate is disposed at the bottom of the first cylindrical groove, and a fourth brazing groove is provided on the side wall of the first cylindrical groove at the location corresponding to the inner tube sheet brazing plate.
5. The brazing structure for a capillary heat exchanger according to claim 4, characterized in that, The first end of the outer tube sheet brazing plate is in contact with the inner tube sheet brazing plate, and the side wall of the first cylindrical groove is provided with the third brazing groove at the first end of the outer tube sheet brazing plate.
6. The brazing structure for a capillary heat exchanger according to claim 5, characterized in that, The second end of the brazing plate of the outer tube sheet is in contact with the bottom of the second cylindrical groove, and a fifth brazing groove is provided on the side wall of the second cylindrical groove at the contact point with the brazing plate of the outer tube sheet.
7. The brazing structure for a capillary heat exchanger according to claim 2, characterized in that, The first end of the inner tube sheet body is provided with a sixth brazing groove at the contact point with the cylinder.
8. The brazing structure for a capillary heat exchanger according to claim 2, characterized in that, The brazing structure for the capillary heat exchanger also includes a connecting pipe. An opening is provided on the side wall of the inner tube sheet body. The first end of the connecting pipe is inserted into the opening. A seventh brazing groove is provided at the contact point between the first end of the connecting pipe and the opening.
9. The brazing structure for a capillary heat exchanger according to claim 8, characterized in that, The outer periphery of the first end of the connector is chamfered, and the seventh brazing groove is provided at the chamfer.
10. A capillary heat exchanger, characterized in that, The capillary heat exchanger includes the brazed structure for a capillary heat exchanger as described in any one of claims 1 to 9.