Capillary tube heat exchanger

Abstract

The utility model relates to a capillary tube heat exchanger. The capillary tube heat exchanger comprises a heat exchange cylinder, a heat exchange tube and two outer tube plates, and a containing cavity and two medium inlets and outlets communicating with the containing cavity are formed in the heat exchange cylinder. The heat exchange tube is arranged in the containing cavity in a penetrating mode, and the two ends of the heat exchange tube penetrate out of the two ends of the heat exchange cylinder respectively. The two outer tube plates are connected to the two ends of the heat exchange tube respectively, each outer tube plate is provided with a first tube hole allowing the heat exchange tube to penetrate through, the hole wall of each first tube hole is welded to the heat exchange tube, and the hole wall of each first tube hole is provided with a first filling groove used for being filled with welding flux. According to the capillary tube heat exchanger, the welding flux is buried in the first filler groove in a hidden mode, and the problems of welding flux accumulation, welding omission, welding lack and the like caused by exposed welding flux can be avoided. The sealing performance between the outer tube plate and the heat exchange tube is further improved, the sealing performance of the capillary tube heat exchanger is further improved, and meanwhile the overall appearance of the capillary tube heat exchanger can be kept clean and simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to a capillary tube heat exchanger. BACKGROUND

[0002] The capillary tube heat exchanger has excellent heat transfer performance due to the small diameter, thin wall and small thermal resistance of the heat exchange tube inside the capillary tube heat exchanger, and is widely used in the heat exchange fields of medicine, petrochemical industry, cooling and heating engineering, etc.

[0003] In the related art, the capillary tube heat exchanger usually includes a cylinder, two tube plates respectively connected at both ends of the cylinder, and a heat exchange tube penetrating between the two tube plates. By injecting a first medium into the cylinder and injecting a second medium into the heat exchange tube, heat exchange between the first medium and the second medium can be realized. The tube plate of the capillary tube heat exchanger is usually welded with the heat exchange tube. However, in the related art, the welding part of the tube plate and the heat exchange tube is prone to problems such as solder accumulation, incomplete welding and missing welding, which not only affects the sealing between the tube plate and the heat exchange tube, but also cannot guarantee the cleanliness of the product appearance. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a capillary tube heat exchanger to avoid the problems of solder accumulation, incomplete welding and missing welding at the welding part.

[0005] The present application provides a capillary tube heat exchanger, comprising:

[0006] A heat exchange cylinder is formed with a cavity and two medium inlets and outlets communicating with the cavity;

[0007] A heat exchange tube penetrates the cavity, and both ends of the heat exchange tube penetrate out of both ends of the heat exchange cylinder;

[0008] Two outer tube plates are respectively connected at both ends of the heat exchange tube, each heat exchange tube is provided with a first tube hole for the heat exchange tube to penetrate, and the hole wall of the first tube hole is welded with the heat exchange tube, wherein the hole wall of the first tube hole is provided with a first filler groove for filling solder.

[0009] The technical solutions are further described as follows:

[0010] In one embodiment, the heat exchange cylinder comprises:

[0011] A cylinder is a hollow structure with both ends open;

[0012] Two short section pipes, two short section pipes are connected at both ends of the cylinder respectively, and two short section pipes and the cylinder are enclosed to form the cavity, wherein one end of the short section pipe is an open end with an opening, the open end is connected with the end of the cylinder, the other end of the short section pipe is connected with an inner tube plate to form a closed end, two ends of the heat exchange pipe penetrate through two inner tube plates respectively, and two medium inlets and outlets are arranged on the side wall of two short section pipes respectively.

[0013] In one embodiment, the inner tube plate is provided with a second tube hole for the heat exchange pipe to penetrate out, and the hole wall of the second tube hole is welded with the heat exchange pipe, wherein the hole wall of the second tube hole is provided with a second filler groove for filling the welding material.

[0014] In one embodiment, the first filler groove and / or the second filler groove are annular grooves arranged circumferentially around the heat exchange pipe.

[0015] In one embodiment, the end of the cylinder is inserted into the open end of the short section pipe, and the outer wall of the cylinder is welded with the inner wall of the open end.

[0016] In one embodiment, the outer wall of the cylinder and / or the inner wall of the open end is provided with a third filler groove for filling the welding material.

[0017] In one embodiment, the number of third filler grooves is two or more, and each third filler groove is arranged along the axial direction of the cylinder.

[0018] In one embodiment, the third filler groove is an annular groove arranged circumferentially around the cylinder.

[0019] In one embodiment, the cross section of the third filler groove is rectangular or trapezoidal, and the slot width of the third filler groove with trapezoidal cross section is greater than the slot bottom width.

[0020] In one embodiment, the number of heat exchange pipes is multiple, the multiple heat exchange pipes are arranged in parallel and spaced apart, a plurality of first tube holes are arranged on the outer tube plate, the heat exchange pipes are correspondingly arranged in the first tube holes, and the hole wall of each first tube hole is provided with the first filler groove.

[0021] In the capillary heat exchanger, the first tube hole is formed on the outer tube plate, the end of the heat exchange tube is inserted into the first tube hole, and the hole wall of the first tube hole is welded with the heat exchange tube, so that the stability and sealing of the connection between the outer tube plate and the heat exchange tube are improved, the end of the heat exchange tube and the cavity of the heat exchange cylinder can be effectively isolated, and cross contamination of the first medium and the second medium is avoided. Meanwhile, the first filler groove is formed on the hole wall of the first tube hole, and the solder is uniformly applied in the first filler groove during assembly. The solder includes but is not limited to brazing filler metal. When the welding process is performed, the solder is melted in a high-temperature environment to fill the space in the entire first filler groove, so as to firmly weld and fix the outer tube plate and the heat exchange tube together. Compared with the traditional welding scheme of exposing the solder, the solder is embedded in the first filler groove in the present application, so that the problems of solder accumulation, missing welding and the like caused by the exposed solder are avoided. The sealing between the outer tube plate and the heat exchange tube is further improved, and the sealing performance of the capillary heat exchanger is improved, and the overall appearance of the capillary heat exchanger can be kept clean and simple. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve the purpose of explaining the present application. The accompanying drawings do not constitute an inappropriate limitation on the present application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without creating labor.

[0024] In addition, the drawings are not drawn to scale 1:1, and the relative sizes of the various elements are only exemplarily drawn in the drawings, but not necessarily drawn according to the true scale. In the drawings:

[0025] Figure 1 The structure sectional view of the capillary heat exchanger of an embodiment.

[0026] Figure 2 The left view of the capillary heat exchanger of an embodiment.

[0027] Figure 3 The structure schematic view of the outer tube plate and the heat exchange tube of an embodiment.

[0028] Figure 4 The cooperation schematic view of the short section tube and the heat exchange tube and the cylinder of an embodiment.

[0029] Figure 5 The cooperation schematic view of the short section tube and the heat exchange tube and the cylinder of another embodiment.

[0030] Figure 6 The matching diagram of the short section pipe, the heat exchange pipe and the cylinder for another embodiment.

[0031] Figure 7 The matching diagram of the short section pipe, the heat exchange pipe and the cylinder for another embodiment.

[0032] Explanation of reference signs:

[0033] 10, heat exchange cylinder; 11, cylinder; 111, cavity; 12, short section pipe; 121, medium inlet and outlet; 122, third packing groove; 13, inner pipe plate; 131, second pipe hole; 132, second packing groove; 20, outer pipe plate; 21, first pipe hole; 22, first packing groove; 30, heat exchange pipe; 40, baffle. DETAILED DESCRIPTION

[0034] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways other than those described herein without departing from the spirit of the present application. It is therefore intended that the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0037] In the present application, unless specifically defined and limited otherwise, if there is a description of "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless specifically defined and limited otherwise, if there is a description of "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0040] Specifically, in the conventional capillary heat exchanger, the heat exchange tube bundle is arranged relatively closely, and since the coaxiality matching requirement between the various components of the capillary heat exchanger is relatively high, during the assembly process, the filler is placed on the welding position, and before being put into the furnace for welding, the capillary heat exchanger with completed assembly filler is placed horizontally on the tool positioning. If the filler is placed directly, it may cause the filler to flow to the lowest end under the action of gravity in the high-temperature processing state. At this time, the weld at the high end produces a leak, and the weld at the low end produces a filler accumulation, directly affecting the welding sealing performance and appearance of the capillary heat exchanger.

[0041] Based on this, an embodiment of the present application provides a capillary heat exchanger. Specifically, referring to Figure 1 and Figure 2The capillary heat exchanger of one embodiment comprises a heat exchange cylinder 10, a heat exchange tube 30 and two outer tube plates 20. The heat exchange cylinder 10 is formed with a cavity 111 and two medium outlets 121 communicating with the cavity 111. The heat exchange tube 30 is arranged in the cavity 111, and the two ends of the heat exchange tube 30 respectively pass through the two ends of the heat exchange cylinder 10. The two outer tube plates 20 are respectively connected to the two ends of the heat exchange tube 30. The capillary heat exchanger is combined with the heat exchange cylinder 10, the heat exchange tube 30 and the two outer tube plates 20. Figure 3 Each outer tube plate 20 is provided with a first tube hole 21 for the heat exchange tube 30 to pass through, and the hole wall of the first tube hole 21 is welded with the heat exchange tube 30. The hole wall of the first tube hole 21 is provided with a first filler groove 22 for filling the welding material.

[0042] Exemplarily, in the working process of the capillary heat exchanger, the first medium can be introduced into the cavity 111 of the heat exchange cylinder 10 through one of the medium outlets 121, and the first medium in the cavity 111 can be discharged through the other medium outlet 121, so as to realize the circulation of the first medium in the cavity 111. The first medium can be refrigerant or heat medium. The outer tube plate 20 is used to connect with external equipment, and the second medium can be introduced into the heat exchange tube 30 through the external equipment. The second medium can be liquid or gas which needs to be heat exchanged. In this way, the heat exchange between the first medium in the cavity 111 and the second medium in the heat exchange tube 30 through the tube wall of the heat exchange tube 30 can be realized.

[0043] In the capillary heat exchanger, the first tube hole 21 is arranged on the outer tube plate 20, and the end of the heat exchange tube 30 is inserted into the first tube hole 21, and the hole wall of the first tube hole 21 is welded with the heat exchange tube 30, so as to enhance the connection stability and sealing performance of the outer tube plate 20 and the heat exchange tube 30, and the end of the heat exchange tube 30 and the cavity 111 of the heat exchange cylinder 10 can be effectively isolated by the outer tube plate 20, so as to avoid the cross contamination between the first medium and the second medium. Meanwhile, the first filler groove 22 is arranged on the hole wall of the first tube hole 21, and the welding material, which includes but is not limited to brazing material, can be uniformly coated in the first filler groove 22 in the assembly process. When the welding process is performed, the welding material is melted in the high temperature environment to fill the space in the first filler groove 22, so as to firmly weld and fix the outer tube plate 20 and the heat exchange tube 30 together. Compared with the traditional welding scheme of exposing the welding material, the welding material is embedded in the first filler groove 22 in the present application, so as to avoid the problems of welding material accumulation, missing welding and the like caused by exposing the welding material. The sealing performance between the outer tube plate 20 and the heat exchange tube 30 is further improved, and the sealing performance of the capillary heat exchanger is improved, and the overall appearance of the capillary heat exchanger can be kept clean and simple.

[0044] Optionally, in an embodiment, the first filler groove 22 is an annular groove arranged circumferentially around the heat exchange tube 30. In this way, the solder in the first filler groove 22 can form an annular weld between the hole wall of the first tube hole 21 and the heat exchange tube 30 after melting, thereby improving the sealing performance between the outer tube plate 20 and the heat exchange tube 30. Further, the number of first filler grooves 22 is not limited to one, and in other embodiments, the number of first filler grooves 22 can also be two, three, four or more, and each first filler groove 22 is arranged axially along the heat exchange tube 30. In this way, the solder can form multiple annular welds between the hole wall of the first tube hole 21 and the heat exchange tube 30 after melting, thereby improving the sealing performance between the outer tube plate 20 and the heat exchange tube 30.

[0045] Referring to Figure 1 In an embodiment, the heat exchange cylinder 10 includes a cylinder body 11 and two stub tubes 12, wherein the cylinder body 11 is a hollow structure with open ends; the two stub tubes 12 are connected to the two ends of the cylinder body 11, and the two stub tubes 12 and the cylinder body 11 together enclose a cavity 111, wherein one end of the stub tube 12 is an open end with an opening, the open end is connected to the end of the cylinder body 11, the other end of the stub tube 12 is connected to an inner tube plate 13 to form a closed end, and the two ends of the heat exchange tube 30 respectively penetrate through the two inner tube plates 13, and the two medium inlets and outlets 121 are respectively arranged on the side walls of the two stub tubes 12.

[0046] By arranging the stub tube 12 at both ends of the cylinder body 11, forming a closed end by arranging the inner tube plate 13 at the section of each stub tube 12 away from the cylinder body 11, and making the two ends of the heat exchange tube 30 respectively penetrate through the two inner tube plates 13, in combination with the outer tube plate 20 connected to the end of the heat exchange tube 30, the port of the heat exchange tube 30 and the cavity 111 of the heat exchange cylinder 10 are sealed by the double tube plates (the inner tube plate 13 and the outer tube plate 20), which further prevents the first medium in the cavity 111 from entering the heat exchange tube 30 from the two ends of the heat exchange tube 30, thereby preventing cross contamination between the first medium and the second medium.

[0047] Further, referring to Figure 4The inner tube plate 13 is provided with a second tube hole 131 for the heat exchange tube 30 to pass through, and the hole wall of the second tube hole 131 is welded with the heat exchange tube 30. The hole wall of the second tube hole 131 is provided with a second filler groove 132 for filling the welding material. In this way, during the assembly process, the welding material can be uniformly applied in the second filler groove 132. When the welding process is performed, the welding material will melt in the high temperature environment to fill the space in the entire second filler groove 132, so as to weld and fix the outer tube plate 20 and the heat exchange tube 30 together, thereby improving the connection stability and sealing performance of the inner tube plate 13 and the heat exchange tube 30. Compared with the traditional welding method of exposing the welding material, the welding material is embedded in the second filler groove 132 in the present application, which can avoid the problems of welding material accumulation, welding leakage and incomplete welding caused by exposing the welding material. The sealing performance between the inner tube plate 13 and the heat exchange tube 30 is further improved, and the overall appearance of the capillary heat exchanger can be kept clean and simple.

[0048] Optionally, in an embodiment, the second filler groove 132 is an annular groove arranged around the circumference of the heat exchange tube 30. In this way, after the welding material in the second filler groove 132 melts, an annular welding seam can be formed between the hole wall of the second tube hole 131 and the heat exchange tube 30, thereby improving the sealing performance between the inner tube plate 13 and the heat exchange tube 30. Further, the number of second filler grooves 132 is not limited to one. In other embodiments, the number of second filler grooves 132 can also be two, three, four or more, and each second filler groove 132 is arranged along the axial direction of the heat exchange tube 30. In this way, after the welding material melts, multiple annular welding seams can be formed between the hole wall of the second tube hole 131 and the heat exchange tube 30, thereby improving the sealing performance between the inner tube plate 13 and the heat exchange tube 30.

[0049] Referring to Figure 1 In an embodiment, the end of the cylinder body 11 is inserted into the open end of the short joint pipe 12, and the outer wall of the cylinder body 11 is welded with the inner wall of the open end. By inserting the end of the cylinder body 11 into the open end of the short joint pipe 12, the connection stability of the cylinder body 11 and the short joint pipe 12 can be improved, and the coaxiality between the outer tube plate 20 and the short joint pipe 12 can be ensured, thereby further improving the installation accuracy and avoiding the problem of product unqualification caused by dimensional deviation during the assembly process or the machining process. By welding the outer wall of the cylinder body 11 with the inner wall of the open end of the short joint pipe 12, the connection stability of the cylinder body 11 and the short joint pipe 12 is further improved, and the sealing performance between the cylinder body 11 and the short joint pipe 12 is also improved. For example, the cylinder body 11 and the short joint pipe 12 can be welded and fixed by brazing process.

[0050] Further, referring to Figure 4The inner wall of the open end is provided with a third filler groove 122 for filling solder. During assembly, solder is uniformly applied in the third filler groove 122, and then welding is performed between the outer wall of the cylinder body 11 and the inner wall of the open end, so as to firmly weld and fix the cylinder body 11 and the short pipe 12 together. Compared with the traditional way of welding with exposed solder, in the present application, by embedding the solder in the third filler groove 122, the problems of solder accumulation, incomplete welding and the like caused by exposed solder can be avoided. The sealing performance between the cylinder body 11 and the short pipe 12 is further improved, and meanwhile the overall appearance of the capillary tube heat exchanger can be kept clean and simple.

[0051] It is worth noting that in other embodiments, the outer wall of the cylinder body 11 can also be provided with a third filler groove 122. In this way, during assembly, solder is uniformly applied in the third filler groove 122, and then welding is performed, so as to firmly weld and fix the cylinder body 11 and the short pipe 12 together, and the problems of solder accumulation, incomplete welding and the like can be avoided.

[0052] Optionally, in an embodiment, the third filler groove 122 is an annular groove arranged in the circumferential direction of the cylinder body 11. In this way, after the solder in the third filler groove 122 melts, an annular weld joint can be formed between the short pipe 12 and the cylinder body 11, so as to improve the sealing performance between the short pipe 12 and the cylinder body 11.

[0053] Optionally, in an embodiment, the number of third filler grooves 122 is not limited to one. As shown in Figure 5 and Figure 6 in other embodiments, the number of third filler grooves 122 can also be two, three, four or more, and each third filler groove 122 is arranged in the axial direction of the heat exchange pipe 30. In this way, after the solder melts, a plurality of annular weld joints can be formed between the cylinder body 11 and the short pipe 12, so as to improve the sealing performance between the cylinder body 11 and the short pipe 12.

[0054] Referring to Figure 6 , in an embodiment, the cross section of the third filler groove 122 is rectangular, wherein the cross section of the third filler groove 122 refers to the cross section of the third filler groove 122 in the radial direction of the short pipe 12. Referring to Figure 7 , in another embodiment, the cross section of the third filler groove 122 is trapezoidal, and the slot width of the third filler groove 122 with the trapezoidal cross section is greater than the slot bottom width. In this way, it is easier to fill the solder into the first filler groove 22.

[0055] Continuing to refer to Figure 1Optionally, the capillary heat exchanger comprises a plurality of baffles 40, which are arranged in the cavity 111 along the length direction of the cylinder 11 to form a tortuous flow path in the cavity 111. Each baffle 40 is provided with a through hole for the heat exchange tube 30 to pass through. For example, as shown in Figure 1 The baffles 40 are arranged in the top wall of the cavity 111, and the baffles 40 are arranged in the bottom wall of the cavity 111. Along the length direction of the cylinder 11, the baffles 40 arranged in the top wall of the cavity 111 and the baffles 40 arranged in the bottom wall of the cavity 111 are arranged alternately. In this way, a tortuous flow path is formed in the cavity 111, the path and time of the first medium flowing through the cavity 111 are prolonged, the first medium can be more fully contacted with the heat exchange tube 30, and the heat exchange efficiency is further improved.

[0056] Referring to Figure 4 The number of the heat exchange tubes 30 is multiple, the multiple heat exchange tubes 30 are arranged in parallel and at intervals, and the outer tube plate 20 is provided with a plurality of first tube holes 21. The heat exchange tube 30 is arranged in the first tube hole 21 one by one, and the hole wall of each first tube hole 21 is provided with a first filler groove 22, so that each heat exchange tube 30 can be tightly connected with the outer tube plate 20. The second medium is introduced into the multiple heat exchange tubes 30 at the same time, the flow of the second medium is improved, and the heat exchange efficiency of the second medium is also improved. For example, the heat exchange tube 30 is a capillary tube, which has a small diameter and a thin wall, and can effectively improve the heat exchange efficiency.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0058] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A capillary heat exchanger, characterized by, The application relates to a heat exchange cylinder. The heat exchange cylinder comprises: a cylinder body which is a hollow structure with two open ends; two short section pipes which are connected to the two ends of the cylinder body respectively and jointly form the cavity with the cylinder body, wherein one end of the short section pipe is an open end with an opening, the open end is connected to the end of the cylinder body, the other end of the short section pipe is connected to an inner pipe plate to form a closed end, the two ends of the heat exchange pipe respectively penetrate through the two inner pipe plates, and the two medium outlets are respectively arranged on the side walls of the two short section pipes.

2. The capillary heat exchanger according to claim 1, characterized in that The inner pipe plate is provided with a second pipe hole for the heat exchange pipe to penetrate, and the hole wall of the second pipe hole is welded with the heat exchange pipe, wherein the hole wall of the second pipe hole is provided with a second filler groove for filling welding material. The first filler groove and / or the second filler groove are annular grooves arranged in the circumferential direction of the heat exchange pipe. The end of the cylinder body is inserted into the open end of the short section pipe, and the outer wall of the cylinder body is welded with the inner wall of the open end.

3. The capillary heat exchanger according to claim 2, characterized in that The outer wall of the cylinder body and / or the inner wall of the open end is provided with a third filler groove for filling welding material.

4. The capillary heat exchanger according to claim 3, characterized in that The number of the third filler grooves is two or more, and each third filler groove is arranged in the axial direction of the cylinder body.

5. The capillary heat exchanger of claim 2, wherein The third filler groove is an annular groove arranged in the circumferential direction of the cylinder body.

6. The capillary heat exchanger of claim 5, wherein The cross section of the third filler groove is rectangular or trapezoidal, and the notch width of the third filler groove with the trapezoidal cross section is greater than the groove bottom width.

7. The capillary heat exchanger of claim 6, wherein The number of the heat exchange pipes is multiple, the multiple heat exchange pipes are arranged in parallel and at intervals, a plurality of first pipe holes are arranged on the outer pipe plate, the heat exchange pipes are correspondingly arranged in the first pipe holes, and the hole wall of each first pipe hole is provided with the first filler groove.

8. The capillary heat exchanger of claim 6, wherein ​ 9. The capillary heat exchanger of claim 6, wherein ​ 10. The capillary heat exchanger according to any one of claims 1 to 9, characterized in that ​

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