Capillary tube heat exchanger

Abstract

The capillary tube heat exchanger comprises a barrel, a short section tube outer tube plate and a heat exchange tube, and the barrel is provided with a containing cavity with the two ends open. One end of the short section pipe is an open end with an opening, the other end of the short section pipe is connected with an inner pipe plate to form a closed end, the open end of the short section pipe is connected with the end of the barrel, and a drainage opening communicated with the containing cavity is further formed in the side wall of the short section pipe. The outer tube plate is connected with one side, deviating from the barrel, of the inner tube plate. The heat exchange tube is arranged in the containing cavity in a penetrating mode, and the end of the heat exchange tube penetrates through the inner tube plate and the outer tube plate and extends out of the containing cavity. According to the capillary tube heat exchanger, the sealing performance of the capillary tube heat exchanger is effectively improved, the problem that a first medium in the barrel and a second medium in the heat exchange tube are mixed due to leakage points at the end of the barrel is solved, and then cross contamination of the first medium and the second medium is avoided.

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 of the first medium and the second medium can be realized. However, in the related art, the sealing performance of the capillary tube heat exchanger is not ideal, which can easily cause the first medium in the cylinder to be confused with the second medium in the heat exchange tube, resulting in cross contamination of the first medium and the second medium. UTILITY MODEL CONTENT

[0004] Therefore, it is necessary to provide a capillary tube heat exchanger for improving the sealing performance of the capillary tube heat exchanger.

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

[0006] a cylinder, the cylinder being provided with a cavity with two open ends;

[0007] a short section tube, one end of the short section tube being an open end with an opening, the other end of the short section tube being connected with an inner tube plate to form a closed end, the open end being connected with an end portion of the cylinder, and a side wall of the short section tube being further provided with a drainage port in communication with the cavity;

[0008] an outer tube plate, the outer tube plate being connected with the inner tube plate away from the cylinder;

[0009] a heat exchange tube, the heat exchange tube penetrating in the cavity, and end portions of the heat exchange tube penetrating through the inner tube plate and the outer tube plate and extending out of the cavity.

[0010] The technical solutions are further described as follows:

[0011] In one of the embodiments, one of the inner tube plate and the outer tube plate is provided with a boss portion, and the other is provided with a groove, and the boss portion is inserted into the groove.

[0012] In one of the embodiments, the boss portion is a hollow structure, so as to form an overflow cavity between the inner tube plate and the outer tube plate, and an outer wall of the boss portion is further provided with an overflow port in communication with the overflow cavity.

[0013] In one of the embodiments, the boss portion is provided with a plurality of overflow openings which are arranged at intervals along the circumference of the short section pipe.

[0014] In one of the embodiments, the boss portion is welded with the groove wall of the groove, and the groove wall and / or the outer wall of the boss portion is provided with a filler groove for accommodating the welding material.

[0015] In one of the embodiments, the end portion of the cylinder is inserted into the open end, and the outer wall of the cylinder is welded with the inner wall of the open end.

[0016] In one of the embodiments, the outer pipe plate is provided with a first sealing ring on the side facing away from the short section pipe.

[0017] In one of the embodiments, the capillary tube heat exchanger further comprises a connecting pipe, one end of the connecting pipe is communicated with the flow guide opening, and the other end of the connecting pipe is formed with a chuck for connecting external equipment, and the chuck is provided with a second sealing ring on the side facing away from the short section pipe.

[0018] In one of the embodiments, the capillary tube heat exchanger comprises a plurality of baffles which are arranged at intervals along the length direction of the cylinder in the accommodating cavity to form a zigzag flow channel in the accommodating cavity, and each of the baffles is provided with a through hole for the heat exchange pipe to pass through.

[0019] In one of the embodiments, the number of the heat exchange pipes is a plurality, and the plurality of heat exchange pipes are parallel and spaced to pass through the accommodating cavity; and / or, the number of the short section pipes is two, and the two short section pipes are connected at the two ends of the cylinder respectively, the outer pipe plate is connected to the side of each of the inner pipe plates facing away from the cylinder, and the two ends of the heat exchange pipe pass out of the two outer pipe plates respectively.

[0020] In the capillary tube heat exchanger, the short section pipe is arranged at the end portion of the cylinder, the inner pipe plate is arranged at the closed end of the short section pipe, the outer pipe plate is connected to the side of the inner pipe plate facing away from the cylinder, and the end portion of the heat exchange pipe passes through the inner pipe plate and the outer pipe plate to pass out of the accommodating cavity, so that the double pipe plates (the inner pipe plate and the outer pipe plate) are arranged between the end portion of the cylinder and the end portion of the heat exchange pipe to achieve the sealed isolation, the sealing performance of the capillary tube heat exchanger is effectively improved, the problem that the first medium in the cylinder and the second medium in the heat exchange pipe are mixed due to the leakage of the end portion of the cylinder is avoided, and the cross contamination of the first medium and the second medium is further avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings which form a part of this application are is to provide further understanding of this application, and the schematic embodiments of this application and the description thereof are used to explain this application, and do not constitute improper limitations to this application.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0023] In addition, the drawings are not drawn in the ratio of 1:1, and the relative sizes of the various elements are only exemplarily drawn in the drawings, and are not necessarily drawn in the true ratio. In the drawings:

[0024] Figure 1 Structure sectional view of a capillary heat exchanger of an embodiment.

[0025] Figure 2 Left view of a capillary heat exchanger of an embodiment.

[0026] Figure 3 Structure schematic view of an outer tube plate and a short section tube of an embodiment.

[0027] Explanation of reference signs:

[0028] 10, barrel; 11, cavity; 20, short section tube; 21, inner tube plate; 211, groove; 212, packing groove; 22, open end; 23, flow guide; 30, outer tube plate; 31, boss part; 32, overflow cavity; 33, overflow port; 40, heat exchange tube; 50, baffle; 60, connecting tube; 61, chuck. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, 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 application and simplifying the description, and do not indicate or imply 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 a limitation on the application.

[0031] In addition, if there are these terms "first", "second", 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 indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise explicitly specified and limited, if there are terms such as "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; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0033] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on" or "under" the second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] It is to be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for the purpose of illustration only and do not indicate the only orientation of the embodiments.

[0035] An embodiment of the present application provides a capillary heat exchanger. Specifically, referring to Figures 1 to 3 An embodiment of the capillary heat exchanger comprises a cylinder 10, a short section pipe 20, an outer pipe plate 30, and a heat exchange pipe 40. The cylinder 10 is provided with a cavity 11 with two open ends. One end of the short section pipe 20 is an open end 22 with an opening, and the other end of the short section pipe 20 is connected with an inner pipe plate 21 to form a closed end. The open end 22 of the short section pipe 20 is connected with the end of the cylinder 10, and the sidewall of the short section pipe 20 is further provided with a drainage port 23 in communication with the cavity 11. The outer pipe plate 30 is connected with the side of the inner pipe plate 21 away from the cylinder 10. The heat exchange pipe 40 is arranged in the cavity 11, and the end of the heat exchange pipe 40 penetrates through the inner pipe plate 21 and the outer pipe plate 30 and extends out of the cavity 11.

[0036] Exemplarily, in the working process of the capillary heat exchanger, the drainage port 23 is used to connect with a first external device, and the first external device can pass a first medium into the cavity 11 of the cylinder 10 through the drainage port 23. The first medium can be a coolant or a heat medium. The outer pipe plate 30 is used to connect with a second external device, and the second external device can pass a second medium into the heat exchange pipe 40. The second medium can be a liquid or a gas that needs to be heat exchanged. In this way, the first medium and the second medium can be heat exchanged through the pipe wall of the heat exchange pipe 40 in the cavity 11.

[0037] Further, in the capillary heat exchanger, by arranging the short section pipe 20 at the end of the cylinder 10, arranging the inner pipe plate 21 at the closed end of the short section pipe 20, connecting the outer pipe plate 30 with the side of the inner pipe plate 21 away from the cylinder 10, and making the end of the heat exchange pipe 40 penetrate through the inner pipe plate 21 and the outer pipe plate 30 and extend out of the cavity 11, a double pipe plate (the inner pipe plate 21 and the outer pipe plate 30) is formed between the end of the cylinder 10 and the end of the heat exchange pipe 40, which effectively improves the sealing performance of the capillary heat exchanger, avoids the confusion between the first medium in the cylinder 10 and the second medium in the heat exchange pipe 40 due to the leakage at the end of the cylinder 10, and further avoids the cross contamination between the first medium and the second medium.

[0038] Specifically, referring to Figure 1In an embodiment, the number of short sections 20 is two, and the two short sections 20 are connected at two ends of the barrel 10 respectively. The inner tube plate 21 of each short section 20 is connected with an outer tube plate 30 at a side away from the barrel 10, and the two ends of the heat exchange tube 40 pass through the two outer tube plates 30 respectively. Specifically, the two short sections 20 have the same structure as the two outer tube plates 30, which will not be described herein. The flow guide 23 of one short section 20 is used for the first medium to flow in, and the flow guide 23 of the other short section 20 is used for the first medium to flow out, so that the first medium can flow in the cavity 11. Similarly, one end of the heat exchange tube is used for the second medium to flow in, and the other end of the heat exchange tube is used for the second medium to flow out.

[0039] By arranging the short sections 20 at the two ends of the barrel 10 and connecting the inner tube plate 21 of each short section 20 with the outer tube plate 30 at a side away from the barrel 10, the two ends of the barrel 10 can be sealed by the double tube plates (the inner tube plate 21 and the outer tube plate 30), which further improves the sealing effect of the two ends of the barrel 10. Meanwhile, the two ends of the heat exchange tube 40 pass through the two outer tube plates 30 respectively, so that the two ends of the heat exchange tube 40 can be sealed from the cavity 11 of the barrel 10 by the double tube plates (the inner tube plate 21 and the outer tube plate 30), which further prevents the first medium from entering the heat exchange tube 40 from the two ends of the heat exchange tube 40, thereby preventing the first medium from being contaminated by the second medium.

[0040] Referring to Figure 1 , the number of heat exchange tubes 40 is multiple, and the multiple heat exchange tubes 40 are arranged in parallel and spaced apart in the cavity 11. By simultaneously passing the second medium through the multiple heat exchange tubes 40, the flow of the second medium is improved, and the heat exchange efficiency of the second medium is also improved. Exemplarily, the heat exchange tube 40 is a capillary tube, which has a small diameter and a thin wall, so that the heat exchange efficiency can be effectively improved.

[0041] Referring to Figure 3 , optionally, in an embodiment, one of the inner tube plate 21 and the outer tube plate 30 is provided with a boss portion 31, and the other is provided with a groove 211, and the boss portion 31 is inserted into the groove 211. Exemplarily, as shown in Figure 1 , the side of the inner tube plate 21 away from the barrel 10 is provided with a groove 211, and the side of the outer tube plate 30 close to the inner tube plate 21 is provided with a boss portion 31, and the boss portion 31 is inserted into the groove 211. By assembling the boss portion 31 and the groove 211, the size spacing between the inner tube plate 21 and the outer tube plate 30 can be accurately positioned, so as to avoid installation size deviation, and the coaxiality between the outer tube plate 30 and the short section 20 can be ensured, which further improves the installation precision and avoids the problem of product unqualification caused by size deviation in the assembly process or the processing process.

[0042] Understandably, in other embodiments, the boss portion 31 can also be arranged on the side of the inner tube plate 21 away from the cylinder 10, and correspondingly, the groove 211 is arranged on the side of the outer tube plate 30 close to the inner tube plate 21, so that the boss portion 31 on the inner tube plate 21 is inserted into the groove 211 of the outer tube plate 30, thereby achieving accurate positioning of the size gap between the inner tube plate 21 and the outer tube plate 30, and improving the coaxiality between the outer tube plate 30 and the short section tube 20.

[0043] Continuing to refer to Figure 3 In an embodiment, the boss portion 31 is a hollow structure, so that the overflow cavity 32 is formed between the inner tube plate 21 and the outer tube plate 30, and the outer wall of the boss portion 31 is further provided with an overflow port 33 in communication with the overflow cavity 32. In this way, when the inner tube plate 21 has a leakage point, the first medium in the cavity 11 can enter the overflow cavity 32. At the same time, by arranging the overflow port 33 in communication with the overflow cavity 32 on the outer wall of the boss portion 31, on the one hand, the first medium in the overflow cavity 32 can be discharged from the overflow port 33 in time, avoiding the direct penetration of the first medium into the heat exchange tube 40 through the outer tube plate 30, thereby avoiding the cross contamination of the first medium and the second medium. On the other hand, it is also convenient for the staff to timely find out whether the capillary tube heat exchanger has a leakage condition.

[0044] Further, the boss portion 31 is provided with a plurality of overflow ports 33, and the plurality of overflow ports 33 are arranged on the boss portion 31 in a circumferential direction of the short section tube 20. For example, the overflow port 33 is provided with 4, and the 4 overflow ports 33 are arranged uniformly in the circumferential direction. In this way, when the capillary tube heat exchanger is installed at different azimuth angles, the first medium entering the overflow cavity 32 can be discharged in time through the overflow port 33, so that the staff can timely find out whether the capillary tube heat exchanger has a leakage condition. Understandably, in other embodiments, the number of overflow ports 33 can be 1, 2, 3, 5 or more, which is not limited herein.

[0045] Optionally, in an embodiment, the boss portion 31 is welded with the groove wall of the groove 211, so that on the one hand, the stability of the connection between the outer tube plate 30 and the short section tube 20 can be improved, and on the other hand, the sealing between the outer tube plate 30 and the short section tube 20 can be improved. For example, the boss portion 31 and the groove wall of the groove 211 can be welded by brazing process.

[0046] Referring to Figure 3Further, the groove wall of the groove 211 is provided with a filler groove 212 for accommodating solder. Illustratively, the filler groove 212 is an annular groove. Specifically, during the assembly process, solder, including but not limited to brazing filler metal, can be uniformly applied in the filler groove 212. When the welding process is performed, the solder will melt in the high-temperature environment to fill the entire space in the filler groove 212, so as to firmly weld and fix the outer tube plate 30 and the short length pipe 20 together. Compared with the conventional welding scheme using external solder, in the present application, by embedding the solder in the filler groove 212, the problems of solder accumulation, incomplete welding, and the like caused by external solder can be avoided. 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.

[0047] It is worth noting that in other embodiments, the outer wall of the boss portion 31 can also be provided with a filler groove 212. Thus, during the assembly process, solder, including but not limited to brazing filler metal, can be uniformly applied in the filler groove 212, and then welding is performed, so as to firmly weld and fix the outer tube plate 30 and the short length pipe 20 together, and the problems of solder accumulation, incomplete welding, and the like caused by external solder can be avoided.

[0048] Referring to Figure 1 In an embodiment, the end portion of the cylinder body 10 is inserted into the open end 22. By inserting the end portion of the cylinder body 10 into the open end 22, the connection stability of the cylinder body 10 and the short length pipe 20 can be enhanced, and meanwhile, the coaxiality between the outer tube plate 30 and the short length pipe 20 can be ensured, so as to further improve the installation precision and avoid the problem of product unqualification caused by dimensional deviation during the assembly process or the processing process.

[0049] Further, the outer wall of the cylinder body 10 and the inner wall of the open end 22 are welded. In this way, on the one hand, the connection stability of the cylinder body 10 and the short length pipe 20 can be further enhanced, and on the other hand, the sealing performance between the cylinder body 10 and the short length pipe 20 can be enhanced. Illustratively, the cylinder body 10 and the short length pipe 20 can be fixed by brazing process.

[0050] Illustratively, at least one of the outer wall of the cylinder body 10 and the inner wall of the open end 22 can also be provided with a filler groove 212. During the assembly process, solder, including but not limited to brazing filler metal, can be uniformly applied in the filler groove 212, and then welding between the outer wall of the cylinder body 10 and the inner wall of the open end 22 is performed, so as to firmly weld and fix the cylinder body 10 and the short length pipe 20 together, and the problems of solder accumulation, incomplete welding, and the like caused by external solder can be avoided.

[0051] Referring to Figure 1In an embodiment, the outer tube plate 30 is provided with a first sealing ring (not shown) on the side facing away from the short section tube 20. Specifically, the side of the outer tube plate 30 facing away from the short section tube 20 is used to connect a second external device, and by providing the first sealing ring on the side of the outer tube plate 30 facing away from the short section tube 20, the sealing performance between the outer tube plate 30 and the second external device can be ensured. For example, the side of the outer tube plate 30 facing away from the short section tube 20 is provided with a first sealing groove, and the first sealing ring is arranged in the first sealing groove, thereby limiting the first sealing ring and preventing displacement and misplacement of the first sealing ring from causing leakage.

[0052] Referring to Figure 1 In an embodiment, the capillary heat exchanger further comprises a connecting tube 60, one end of the connecting tube 60 is in communication with the drainage port 23, and the other end of the connecting tube 60 is formed with a chuck 61 for connecting an external device. The chuck 61 is provided with a second sealing ring (not shown) on the side facing away from the short section tube 20. Specifically, the chuck 61 is used to connect a first external device, and by providing the second sealing ring on the side of the chuck 61, the sealing performance between the chuck 61 and the first external device can be ensured. For example, the side of the chuck 61 is provided with a second sealing groove, and the second sealing ring is arranged in the second sealing groove, thereby limiting the second sealing ring and preventing displacement and misplacement of the second sealing ring from causing leakage.

[0053] Continuing to refer to Figure 1 Optionally, the capillary heat exchanger comprises a plurality of baffles 50, which are arranged in the cavity 11 along the length direction of the cylinder body 10 to form a tortuous flow channel in the cavity 11. Each baffle 50 is provided with a through hole for the heat exchange tube 40 to pass through. For example, as shown in Figure 1 some of the plurality of baffles 50 are arranged at the top wall of the cavity 11, and the other part of the baffles 50 are arranged at the bottom wall of the cavity 11. Along the length direction of the cylinder body 10, the baffles 50 arranged at the top wall of the cavity 11 and the baffles 50 arranged at the bottom wall of the cavity 11 are arranged alternately, so as to form a tortuous flow channel in the cavity 11, thereby prolonging the path and time of the first medium flowing through the cavity 11, and enabling the first medium to contact the heat exchange tube 40 more fully, and further improving the heat exchange efficiency.

[0054] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0055] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A capillary heat exchanger, characterized by, The capillary tube heat exchanger comprises: a barrel provided with a cavity with two open ends; a short section pipe, one end of which is an open end with an opening, the other end of which is connected with an inner pipe plate to form a closed end, the open end is connected with the end of the barrel, and the side wall of the short section pipe is further provided with a drainage port in communication with the cavity; an outer pipe plate connected with the inner pipe plate away from the barrel; a heat exchange pipe arranged in the cavity, and the end of the heat exchange pipe extends out of the cavity through the inner pipe plate and the outer pipe plate.

2. The capillary heat exchanger according to claim 1, characterized in that One of the inner pipe plate and the outer pipe plate is provided with a boss part, and the other is provided with a groove, and the boss part is inserted into the groove.

3. The capillary heat exchanger according to claim 2, characterized in that The boss part is a hollow structure to form an overflow cavity between the inner pipe plate and the outer pipe plate, and the outer wall of the boss part is further provided with an overflow port in communication with the overflow cavity.

4. The capillary heat exchanger according to claim 3, characterized in that The boss part is provided with a plurality of overflow ports, which are arranged in the boss part along the circumference of the short section pipe.

5. The capillary heat exchanger of claim 2, wherein The boss part and the groove wall are welded, and the groove wall and / or the outer wall of the boss part is provided with a filler groove for accommodating the welding material.

6. The capillary heat exchanger of claim 1, wherein The end of the barrel is inserted into the open end, and the outer wall of the barrel is welded with the inner wall of the open end.

7. The capillary heat exchanger of claim 1, wherein The outer pipe plate away from the short section pipe is provided with a first sealing ring.

8. The capillary heat exchanger of claim 1, wherein The capillary tube heat exchanger further comprises a connecting pipe, one end of which is in communication with the drainage port, and the other end of which is formed with a chuck for connecting external equipment, and the chuck away from the short section pipe is provided with a second sealing ring.

9. The capillary heat exchanger of claim 1, wherein The capillary tube heat exchanger comprises a plurality of baffles, which are arranged in the cavity along the length direction of the barrel to form a zigzag flow channel in the cavity, and each baffle is provided with a through hole for the heat exchange pipe to pass through.

10. The capillary heat exchanger according to any one of claims 1 to 9, characterized in that The number of heat exchange pipes is multiple, and the multiple heat exchange pipes are arranged in parallel and at intervals in the cavity; and / or, the number of short section pipes is two, and the two short section pipes are connected at the two ends of the barrel respectively, the inner pipe plate away from the barrel of each short section pipe is connected with the outer pipe plate, and the two ends of the heat exchange pipe extend out of the two outer pipe plates respectively.

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