Heat exchanger

Abstract

The application provides a heat exchanger, which comprises a plurality of heat exchange pipes and a plurality of connecting pipes, the plurality of heat exchange pipes have first heat exchange pipes and second heat exchange pipes arranged adjacently, and the first heat exchange pipes and the second heat exchange pipes are communicated through at least one connecting pipe. The connecting pipe comprises an arc-shaped bending section, the maximum width of the arc-shaped bending section is D along the arrangement direction of the first heat exchange pipes and the second heat exchange pipes, the outer surface of the first heat exchange pipe on the side far from the second heat exchange pipe has a first distance H1 from the outer surface of the second heat exchange pipe on the side far from the first heat exchange pipe, and D>H1. Thus, the arc-shaped bending section can obtain a larger bending radius R in the case that the distance between the two adjacent heat exchange pipes is reduced, the reliability of the connecting pipe is ensured, and the problems such as wrinkle, deformation and pipe wall thinning of the arc-shaped bending section can be reduced in the case that the distance between the two adjacent heat exchange pipes is reduced. Thus, the heat exchanger can balance the heat exchange performance and the reliability of the bending part of the connecting pipe.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and more particularly to a heat exchanger used in the field of refrigeration, heating, ventilation and air conditioning. Background Technology

[0002] In related technologies, heat exchangers include multiple heat exchange tubes. When some heat exchange tubes form a loop, two heat exchange tubes are connected by a U-shaped connecting pipe. To improve the heat exchange performance of the heat exchanger, the number of heat exchange tubes needs to be increased. With the space occupied remaining the same, the spacing between adjacent heat exchange tubes decreases, which increases the design difficulty of the connecting pipe and makes it difficult to ensure the reliability of the connecting pipe, thus affecting the heat exchange performance and reliability of the heat exchanger. Utility Model Content

[0003] The purpose of this application is to provide a heat exchanger that can balance heat exchange performance and the reliability of connecting pipes.

[0004] This application provides a heat exchanger, comprising: Multiple heat exchange tubes and multiple connecting tubes, wherein the multiple heat exchange tubes have a first heat exchange tube and a second heat exchange tube arranged adjacent to each other, and the first heat exchange tube and the second heat exchange tube are connected through at least one of the connecting tubes; The connecting pipe includes an arc-shaped bend section along the arrangement direction of the first heat exchange tube and the second heat exchange tube. The maximum width of the arc-shaped bend section is D. There is a first distance H1 between the outer surface of the first heat exchange tube away from the second heat exchange tube and the outer surface of the second heat exchange tube away from the first heat exchange tube, where D > H1.

[0005] The technical solution provided in this application can achieve the following beneficial effects: The heat exchanger provided in this application, when the distance between two adjacent heat exchange tubes is small, can achieve a larger bending radius R by making the maximum width D of the arc-shaped bend section in the arrangement direction of the first and second heat exchange tubes greater than the first distance H1 between the outer surfaces of the first and second heat exchange tubes. This ensures the reliability of the connecting pipe and reduces problems such as wrinkles, deformation, and thinning of the tube wall in the arc-shaped bend section when the distance between two adjacent heat exchange tubes decreases. Thus, it achieves the goal of ensuring the bending quality at the bending position while reducing the spacing between heat exchange tubes, thus balancing the heat exchange performance of the heat exchanger and the reliability of the bending point of the connecting pipe. Attached Figure Description

[0006] Figure 1 This is a partial schematic diagram of the connection between the connecting pipe and the heat exchange pipe in the related technology; Figure 2 This is a schematic diagram of the structure of a heat exchanger provided in an embodiment of this application; Figure 3 for Figure 2 A partial view of the heat exchanger shown; Figure 4 This is a schematic diagram of the structure of a connecting pipe provided in one embodiment of this application; Figure 5 This is a front view schematic diagram of the connection pipe, the first heat exchange pipe, and the second heat exchange pipe in accordance with one embodiment of this application; Figure 6 This is a front view schematic diagram showing the connection of the connecting pipe, the first heat exchange pipe, and the second heat exchange pipe in another embodiment of this application; Figure 7 This is a front view schematic diagram showing the connection of the connecting pipe, the first heat exchange pipe, and the second heat exchange pipe in another embodiment of this application; Figure 8 This is a schematic diagram of the structure of a connecting pipe provided in another embodiment of this application; Figure 9 This is a front view schematic diagram of a connecting pipe provided in one embodiment of this application; Figure 10 This is a schematic diagram of the structure of a connecting pipe provided in another embodiment of this application; Figure 11 for Figure 10 A front view of the connecting pipe shown; Figure 12 This is a schematic diagram of the structure of a connecting pipe provided in another embodiment of this application; Figure 13 This is a schematic diagram of the connecting pipe provided in another embodiment of this application.

[0007] Figure label: 100 - U-shaped tube; 200 - heat exchange tube; 1-Connecting pipe; 11-Arc-shaped bend; 111-First arc-shaped segment; 112-Second arc-shaped segment; 113-Straight segment; 12-First extension segment; 121-First connecting segment; 13-Second extension segment; 131-Second connecting segment; 1a-Flanged end; 1b-Flanged end; 1c-External thread; 1d-Internal thread; 2-Heat exchange tube; 21-First heat exchange tube; 22-Second heat exchange tube; 3-Fin.

[0008] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0009] To better understand the technical solution of this application, the embodiments of this application are described below with reference to the accompanying drawings.

[0010] It should be clearly stated that the described technical solutions are only a part of the technical solutions in this application, not all of them. Based on the technical solutions in this application, all other technical solutions obtained by a person skilled in the art without inventive effort are within the scope of protection of this application.

[0011] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0012] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0013] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0014] A heat exchanger typically includes connecting pipes and multiple heat exchange tubes. The ends of the heat exchange tubes are connected through the connecting pipes. During operation, heat exchange media such as refrigerant or water flow through the heat exchange tubes and connecting pipes to achieve heat exchange. Heat exchangers may also include multiple fins to increase the heat exchange area and improve the heat exchange efficiency. In some heat exchangers, when the heat exchange tubes form a loop, two heat exchange tubes are connected by a U-shaped tube. Figure 1 This is a partial schematic diagram of the fit between a U-shaped tube and a heat exchange tube in related technologies, such as... Figure 1 As shown, the central angle γ corresponding to the arc-shaped part on the existing U-shaped tube 100 is generally 180°, and the bending radius R' of the U-shaped tube 100 (the radius corresponding to the arc-shaped center line C' of the U-shaped tube 100) is half of the distance H' between the center lines of the two heat exchange tubes 200.

[0015] To improve the heat exchanger's performance, the number of heat exchange tubes 200 is increased. With the same space occupied, the distance between adjacent heat exchange tubes 200 decreases, and consequently, the bending radius R' of the U-shaped tube 100 also decreases. For example, if the bending radius R' is less than twice the diameter of the heat exchange tube 200, the U-shaped tube 100 will experience wrinkles, deformation, and thinning at the bends. These wrinkles and deformations increase the flow resistance of the heat exchange medium within the U-shaped tube 100, and the thinned wall areas are weaker and more susceptible to corrosion, leading to pipe leaks and affecting the heat exchanger's performance and reliability.

[0016] The diameter of heat exchange tube 200 refers to its outer diameter. The term "diameter" as used below refers to the outer diameter of the corresponding pipe, and will not be elaborated further below.

[0017] To address the issues of deformation, wrinkling, and thinning of the outer wall of the U-shaped tube 100 when two adjacent heat exchange tubes 200 are close together, this application provides a novel U-shaped connecting tube and a heat exchanger using the novel U-shaped connecting tube.

[0018] Figure 2 This is a schematic diagram of the structure of the heat exchanger provided in the embodiment of this application. Figure 3 for Figure 2 A partial view of the heat exchanger shown. Figure 3 The fins in the middle region of the heat exchanger shown are not shown. Figure 2 and Figure 3 As shown, the heat exchanger includes multiple fins 3, multiple heat exchange tubes 2, and multiple connecting pipes 1. The multiple fins 3 are arranged at intervals along the thickness direction Z of the fins 3, or at intervals along the length direction of the heat exchange tubes 2. The connecting pipes 1 can be connected to the heat exchange tubes 2. For example, the fins 3 may have through holes, and the heat exchange tubes 2 can pass through the corresponding through holes on the multiple fins 3. The heat exchange tubes 2 are in contact with the fins 3, and the fins 3 are connected to the tube wall of the heat exchange tubes 2 to increase the heat exchange area, thereby improving the heat exchange effect.

[0019] In some other heat exchangers, the fins 3 may have through slots (not shown in the figure). Multiple fins 3 are arranged at intervals along the thickness direction Z of the fins 3, or at intervals along the length direction of the heat exchange tubes 2. The heat exchange tubes 2 can pass through corresponding through slots on the multiple fins 3. The fins 3 are connected to the tube wall of the heat exchange tubes 2 to increase the heat exchange area, thereby improving the heat exchange effect. In some other heat exchangers, the fins 3 may also be corrugated fins (not shown in the figure). The fins 3 are located between adjacent heat exchange tubes 2. The fins 3 are connected to the tube wall of the heat exchange tubes 2 to increase heat exchange and improve the heat exchange effect. There are no restrictions on the structure of the fins in the heat exchanger.

[0020] Figure 4This is a schematic diagram of the structure of the connecting pipe 1 provided in one embodiment of this application. Figure 5 This is a front view schematic diagram of the connection pipe 1, the first heat exchange pipe 21, and the second heat exchange pipe 22 provided in one embodiment of this application, as shown. Figure 4 and Figure 5 As shown, among the plurality of heat exchange tubes 2, there are first heat exchange tubes 21 and second heat exchange tubes 22 arranged adjacent to each other, and the first heat exchange tubes 21 and second heat exchange tubes 22 are connected by at least one connecting pipe 1. The connecting pipe 1 is U-shaped, and can also be called a U-shaped pipe, and the connecting pipe 1 includes an arc-shaped bend section 11.

[0021] like Figure 5 As shown, along the arrangement direction X of the first heat exchange tube 21 and the second heat exchange tube 22, the maximum width of the arc-shaped bend 11 is D. There is a first distance H1 between the outer surface of the first heat exchange tube 21 away from the second heat exchange tube 22 and the outer surface of the second heat exchange tube 22 away from the first heat exchange tube 21, where D > H1.

[0022] Therefore, when the distance between two adjacent heat exchange tubes is small, and the bending radius R of the connecting pipe 1 decreases accordingly, by making the maximum width D of the arc-shaped bending segment 11 in the arrangement direction X of the first heat exchange tube 21 and the second heat exchange tube 22 greater than the first distance H1 between the outer surfaces of the first heat exchange tube 21 and the second heat exchange tube 22, the arc-shaped bending segment 11 can protrude beyond the outer surfaces of the first heat exchange tube 21 and the second heat exchange tube 22 in the arrangement direction X. That is, the arc-shaped bending segment 11 can obtain a larger bending radius R. Thus, even when the distance between two adjacent heat exchange tubes is reduced, problems such as wrinkles, deformation, and thinning of the tube wall in the arc-shaped bending segment 11 can be reduced. This achieves the goal of ensuring the bending quality at the bending position while reducing the distance between two adjacent heat exchange tubes, thus balancing the heat exchange performance of the heat exchanger and the reliability of the bending point of the connecting pipe 1. Here, the bending radius R of the connecting pipe 1 refers to the radius corresponding to the arc-shaped center line C3 of the arc-shaped bending segment 11.

[0023] like Figure 5As shown, the arc-shaped bend 11 is circular, and the central angle corresponding to the arc-shaped bend 11 is α. The central angle α needs to meet a certain angle range. If the central angle α is too small, for example, if the central angle α is less than 180°, it is difficult to ensure that the maximum width D of the arc-shaped bend 11 is greater than the first distance H1 between the outer surfaces of the first heat exchange tube 21 and the second heat exchange tube 22, making it difficult to reduce problems such as wrinkles, deformation, and thinning of the tube wall in the arc-shaped bend 11. If the central angle α is too large, for example, if the central angle α is greater than 270°, the distance between adjacent heat exchange tubes 2 is too small, and there is also a risk of interference with the connecting tube 1, making it inconvenient to install the connecting tube 1 and the heat exchange tube 2, and increasing the difficulty of processing. Therefore, in this embodiment, the central angle α can be made to satisfy: 180°<α<270°, which is beneficial to reduce the distance between the first heat exchange tube 21 and the second heat exchange tube 22. At the same time, the arc-shaped bending section 11 has a large bending radius, which can reduce the problems of wrinkles, deformation, and thinning of the tube wall in the arc-shaped bending section 11 when the distance between two adjacent heat exchange tubes is reduced. This can balance the heat exchange performance of the heat exchanger and the reliability of the bend in the connecting pipe 1.

[0024] like Figure 4 and Figure 5 As shown, the connecting pipe 1 further includes a first extension section 12 and a second extension section 13. One end of the arc-shaped bend section 11 is connected to the first extension section 12, and the other end of the arc-shaped bend section 11 is connected to the second extension section 13. The first extension section 12 is connected to the first heat exchange pipe 21, and the second extension section 13 is connected to the second heat exchange pipe 22. The inner cavities of the first heat exchange pipe 21, the first extension section 12, the arc-shaped bend section 11, the second extension section 13, and the second heat exchange pipe 22 are sequentially connected. In this embodiment, by including the first extension section 12 and the second extension section 13 in the arc-shaped bend section 11, it is easier to connect it to the corresponding first heat exchange pipe 21 and second heat exchange pipe 22.

[0025] The first heat exchange tube 21 and the second heat exchange tube 22 are straight tubes. In order to facilitate connection with the first heat exchange tube 21 and the second heat exchange tube 22, the first extension section 12 and the second extension section 13 can also be straight tubes.

[0026] Figure 6 A front view schematic diagram of the connection pipe 1, the first heat exchange pipe 21, and the second heat exchange pipe 22 provided in another embodiment of this application is shown below. Figure 6As shown, the arc-shaped bend 11 includes a first arc segment 111, a second arc segment 112, and a straight segment 113. One end of the straight segment 113 is connected to the first arc segment 111, the end of the first arc segment 111 away from the straight segment 113 is connected to the first extension segment 12, and the end of the first extension segment 12 away from the first arc segment 111 is connected to the first heat exchange tube 21. The other end of the straight segment 113 is connected to the second arc segment 112, the end of the second arc segment 112 away from the straight segment 113 is connected to the second extension segment 13, and the end of the second extension segment 13 away from the second arc segment 112 is connected to the second heat exchange tube 22. By incorporating straight segments in the first arc segment 111 and the second arc segment 112, the space occupied by the connecting pipe 1 is reduced, facilitating the miniaturization design of the heat exchanger.

[0027] In this embodiment, the first arc segment 111 and the second arc segment 112 are arranged opposite each other in the X direction of the arrangement of the first heat exchange tube 21 and the second heat exchange tube 22. The maximum distance between the surface of the first arc segment 111 away from the second arc segment 112 and the surface of the second arc segment 112 away from the first arc segment 111 is the maximum width D of the arc-shaped bend segment 11. The maximum width D is greater than the first distance H1 between the outer surfaces of the first heat exchange tube 21 and the second heat exchange tube 22. At the bend of the arc-shaped bend segment 11 (i.e., the first arc segment 111 and the second arc segment 112), there will be no problems such as wrinkles, deformation, or thinning of the tube wall. The heat exchange performance of the heat exchanger and the reliability of the bend of the connecting tube can be taken into account.

[0028] Figure 7 A front view schematic diagram of the connection pipe 1, the first heat exchange pipe 21, and the second heat exchange pipe 22 provided in another embodiment of this application is shown below. Figure 7As shown, the arc-shaped bend 11 includes a first arc-shaped segment 111 and a second arc-shaped segment 112. The first arc-shaped segment 111 can be connected to the first extension segment 12, and the second arc-shaped segment 112 can be connected to the second extension segment 13. Along the arrangement direction X of the first heat exchange tube 21 and the second heat exchange tube 22, one end of the first arc-shaped segment 111 away from the second arc-shaped segment 112 protrudes from the surface of the first heat exchange tube 21 away from the second heat exchange tube 22; and / or, along the arrangement direction of the first heat exchange tube 21 and the second heat exchange tube 22, one end of the second arc-shaped segment 112 away from the first arc-shaped segment 111 protrudes from the surface of the second heat exchange tube 22 away from the first heat exchange tube 21. In this embodiment, the first arc segment 111 may protrude from the surface of the first heat exchange tube 21, while the second arc segment 112 may not protrude from the surface of the second heat exchange tube 22; or the second arc segment 112 may protrude from the surface of the second heat exchange tube 22, while the first arc segment 111 may not protrude from the surface of the first heat exchange tube 21. That is, the connecting pipe 1 is configured such that only one side protrudes from one of the first heat exchange tube 21 and the second heat exchange tube 22, and the other side of the connecting pipe 1 does not protrude from the other of the first heat exchange tube 21 and the second heat exchange tube 22. Therefore, on the one hand, the maximum width D of the arc-shaped bending section 11 can be greater than the first distance H1 between the outer surfaces of the first heat exchange tube 21 and the second heat exchange tube 22, which can reduce problems such as wrinkles, deformation, and thinning of the tube wall at the bending part (i.e., the first arc-shaped section 111 and the second arc-shaped section 112) on the arc-shaped bending section 11. On the other hand, it is easier to process and manufacture the connecting tube 1, with high processing efficiency, and one side of the connecting tube 1 does not protrude from the corresponding first heat exchange tube 21 or second heat exchange tube 22, which helps to reduce space occupation.

[0029] For example, such as Figure 7 As shown, along the arrangement direction X of the first heat exchange tube 21 and the second heat exchange tube 22, the end of the first arc segment 111 away from the second arc segment 112 protrudes from the surface of the first heat exchange tube 21 away from the second heat exchange tube 22; the tangent of the end of the second arc segment 112 away from the first arc segment 111 is coplanar with the surface of the second heat exchange tube 22 away from the first heat exchange tube 21, that is, the extension direction of the tangent of the end of the second arc segment 112 away from the first arc segment 111 is the same as the extension direction of the second heat exchange tube 22. The second arc segment 112 does not protrude from the second heat exchange tube 22, and the outer surface of the second arc segment 112 is flush with the outer surface of the second heat exchange tube 22. This makes it easier to assemble and weld with the heat exchange tube, resulting in high processing efficiency and reduced space occupation.

[0030] In some other embodiments, the outer surface of the first arc-shaped segment 111 may be flush with the outer surface of the first heat exchange tube 21, while the second arc-shaped segment 112 protrudes from the second heat exchange tube 22. The technical effects of this structure are similar to... Figure 7 The technical effects of the structures shown are similar, and will not be elaborated further here.

[0031] Of course, in some embodiments, the side of the first arc segment 111 away from the second arc segment 112 protrudes from the first heat exchange tube 21, and the side of the second arc segment 112 away from the first arc segment 111 protrudes from the second heat exchange tube 22, so that the connecting pipe 1 constitutes Figure 5 or Figure 6 The structure shown.

[0032] In some embodiments, the arc-shaped bend 11, the first extension 12, and the second extension 13 are integral structures, meaning they can be integrally formed. This allows the arc-shaped bend 11, the first extension 12, and the second extension 13 to be formed during the forming process of the connecting pipe 1, thereby simplifying the process and improving the structural reliability of the connecting pipe 1. For example, the connecting pipe 1 can be formed by bending using a mold. For instance, the distance between the first extension 12 and the second extension 13 can be preset, determined based on the distance between adjacent heat exchange pipes 2. The bending radius of the arc-shaped bend 11 is determined based on this distance. Then, a mold can be used to bend the pipe blank to form the arc-shaped bend 11, the first extension 12, and the second extension 13. The resulting connecting pipe 1 is free of wrinkles and deformation, and the wall thickness of the connecting pipe 1 is consistent, thus balancing the heat exchange performance of the heat exchanger and the reliability of the bending point of the connecting pipe.

[0033] The outer diameters of the arc-shaped bend section 11, the first extension section 12, and the second extension section 13 are the same or nearly the same, to ensure the controllability of parameters such as flow resistance, flow velocity, and flow rate of the heat exchange medium in each pipeline, and at the same time facilitate processing and manufacturing.

[0034] In some embodiments, the outer diameter of each part of the connecting pipe 1 may be the same as or nearly the same as the outer diameter of the first heat exchange pipe 21 and the second heat exchange pipe 22, wherein the outer diameter of the first heat exchange pipe 21 and the outer diameter of the second heat exchange pipe 22 are both d1. Specifically, the outer diameter of the first extension section 12 and the outer diameter of the first heat exchange pipe 21 may be the same as or nearly the same, and the outer diameter of the second extension section 13 and the outer diameter of the second heat exchange pipe 22 may be the same as or nearly the same. This can reduce the flow resistance of the heat exchange medium between the first extension section 12 and the first heat exchange pipe 21, and between the second extension section 13 and the second heat exchange pipe 22, which is beneficial to ensuring the controllability of parameters such as flow resistance, flow velocity, and flow rate of the heat exchange medium in each pipeline.

[0035] like Figure 5As shown, the arc-shaped bend section 11 has an arc-shaped centerline C3 with a radius of R. The first heat exchange tube 21 has a first centerline C1, and the second heat exchange tube 22 has a second centerline C2. The first centerline C1 and the second centerline C2 are parallel, and the distance between the first centerline C1 and the second centerline C2 is H2, where R > H2 / 2. Therefore, the first heat exchange tube 21 connected to the first extension section 12 and the second heat exchange tube 22 connected to the second extension section 13 can have a small gap. At the same time, the connecting tube 1 can have a large bending radius in the arc-shaped bend section 11. This achieves a large bending radius in the bending area of ​​the connecting tube 1 when the two adjacent heat exchange tubes are close together, which can reduce problems such as wrinkles, deformation, and inconsistent wall thickness of the connecting tube 1 after bending. It can balance the heat exchange performance of the heat exchanger and the reliability of the bending point of the connecting tube.

[0036] Figure 8 This is a schematic diagram of the structure of the connecting pipe 1 provided in another embodiment of this application, as shown below. Figure 8 As shown, at least the portion of the first extension 12 away from the arc-shaped bend 11 is the first connecting segment 121, which is fixedly connected to the first heat exchange tube 21, and / or, at least the portion of the second extension 13 away from the arc-shaped bend 11 is the second connecting segment 131, which is fixedly connected to the second heat exchange tube 22.

[0037] The first connecting segment 121 is a part of the first extension segment 12, and the first connecting segment 121 is located near the end of the first extension segment 12 away from the arc-shaped bend segment 11. The end of the first heat exchange tube 21 can be inserted into the first connecting segment 121, or the first heat exchange tube 21 can be sleeved on the outer surface of the first connecting segment 121, thereby being fixedly connected to the first connecting segment 121 by welding or threaded connection. Similarly, the second connecting segment 131 is a part of the second extension segment 13, and the second connecting segment 131 is located near the end of the second extension segment 13 away from the arc-shaped bend segment 11. The end of the second heat exchange tube 22 can be inserted into the second connecting segment 131, or the second heat exchange tube 22 can be sleeved on the outer surface of the second connecting segment 131, thereby being fixedly connected to the second connecting segment 131 by welding or threaded connection.

[0038] Figure 9 This is a front view of the connecting pipe 1 provided in one embodiment of this application, as shown below. Figure 9 As shown, the outer diameter of the first extension segment 12 and the outer diameter of the second extension segment 13 are both d2. The first extension segment 12 has a certain length L1, the first connecting segment 121 has a certain length L2, the second extension segment 13 has a certain length L3, and the second connecting segment 131 has a certain length L4.

[0039] The first connecting segment 121 and / or the second connecting segment 131 need to meet certain length requirements to ensure the reliability of the connection between the first connecting segment 121 and the second connecting segment 131 and the corresponding first heat exchange tube 21 and second heat exchange tube 22. If the length of the first connecting segment 121 and / or the second connecting segment 131 is too small, it will be difficult to guarantee a reliable connection with the corresponding first heat exchange tube 21 and second heat exchange tube 22. Therefore, in this embodiment, the length L2 of the first connecting segment 121 is greater than d2 / 3, and / or the length of the second connecting segment 131 is greater than d2 / 3. By ensuring that the lengths of the first connecting segment 121 and / or the second connecting segment 131 are within the aforementioned corresponding ranges, the reliability of the connection between the first connecting segment 121 and the first heat exchange tube 21, and between the second connecting segment 131 and the second heat exchange tube 22, can be guaranteed. For example, when welding is used to connect the first connecting segment 121 and the first heat exchange tube 21, and when welding is used to connect the second connecting segment 131 and the second heat exchange tube 22, the reliability of the connection between the first connecting segment 121 and the first heat exchange tube 21, and the reliability of the connection between the second connecting segment 131 and the second heat exchange tube 22, can be guaranteed. The welding process can be high-frequency welding, flame welding, vacuum welding, etc., and is not limited here.

[0040] In one embodiment, such as Figure 9 As shown, the first connecting section 121 and / or the second connecting section 131 can be straight pipes. The inner diameter of the end of the first heat exchange tube 21 used to connect with the first connecting section 121 can be larger than the outer diameter of the first connecting section 121. For example, the port of the first heat exchange tube 21 is flared, which facilitates the first heat exchange tube 21 being fitted onto the outside of the first connecting section 121 and fixedly connected. Similarly, the inner diameter of the end of the second heat exchange tube 22 used to connect with the second connecting section 131 can be larger than the outer diameter of the second connecting section 131. For example, the port of the second heat exchange tube 22 is flared, which facilitates the second heat exchange tube 22 being fitted onto the outside of the second connecting section 131 and fixedly connected.

[0041] Figure 10 This is a schematic diagram of the structure of the connecting pipe 1 provided in another embodiment of this application. Figure 11 for Figure 10 The front view of the connecting pipe 1 shown is as follows: Figure 10 and Figure 11As shown, the end of the first connecting section 121 away from the arc-shaped bend 11 can be formed with a flared end 1a, which facilitates the insertion of the first heat exchange tube 21 into the first connecting section 121. At this time, the end of the first heat exchange tube 21 can be a conventional straight structure, thereby avoiding collision between the first heat exchange tube 21 and the end of the first connecting section 121 during installation. Simultaneously, when using welding to connect the first heat exchange tube 21 and the first connecting section 121, the diameter of the flared end 1a is larger than the outer diameter of the first heat exchange tube 21, which facilitates the addition of solder. Positioning the solder at the flared end 1a makes the connection between the connecting tube 1 and the heat exchange tube 2 more reliable and also facilitates the welding operation.

[0042] Similarly, the end of the second connecting section 131 away from the arc-shaped bend section 11 can be flared 1b, which facilitates the insertion of the second heat exchange tube 22 into the second connecting section 131, and also facilitates the addition of solder and welding operations, which will not be described in detail here.

[0043] In one embodiment, the first connecting segment 121 and the first heat exchange tube 21 can be fixedly connected by welding. During a specific welding operation, the flared end 1a of the first connecting segment 121 or the first heat exchange tube 21 allows solder to accumulate at the flared end 1a, forming a reliable weld at the connection point of the connecting tube 1 and the heat exchange tube 2, thus improving the welding reliability of the connection. Compared to threaded connections, the above-described welding method ensures a more reliable connection and fixation between the connecting tube 1 and the heat exchange tube 2. Similarly, the second connecting segment 131 and the second heat exchange tube 22 can also be fixedly connected by the above-described welding process, which will not be elaborated further here.

[0044] Figure 12 This is a schematic diagram of the structure of the connecting pipe 1 provided in another embodiment of this application, as shown below. Figure 12 As shown, the inner wall of the first connecting section 121 may be provided with an internal thread 1d, and the first heat exchange tube 21 may be provided with an external thread. The first heat exchange tube 21 and the connecting pipe 1 can be threadedly connected through the internal thread 1d of the first connecting section 121 and the external thread of the first heat exchange tube 21. The end of the first connecting section 121 may be provided with a flared end 1a, and the end of the first heat exchange tube 21 can be a conventional straight structure. The first heat exchange tube 21 can be inserted into the first connecting section 121 through the flared end 1a, thereby facilitating the assembly of the first heat exchange tube 21 and the first connecting section 121.

[0045] Similarly, the inner wall of the second connecting section 131 may also be provided with an internal thread 1d, the end of the second connecting section 131 may be provided with a flared end 1b, and the second heat exchange tube 22 may be provided with an external thread. The second heat exchange tube 22 can be inserted into the second connecting section through the flared end 1b, and can be threadedly connected through the internal thread 1d of the second connecting section 131 and the external thread of the second heat exchange tube 22.

[0046] The threaded connection facilitates the assembly of the first heat exchange tube 21 and the second heat exchange tube 22 with the connecting tube 1, and the threaded connection increases the heat exchange area between the heat exchange tube and the corresponding connecting section, which helps to improve the heat exchange efficiency.

[0047] Figure 13 This is a schematic diagram of the structure of the connecting pipe 1 provided in another embodiment of this application, as shown below. Figure 13 As shown, the outer surface of the first connecting section 121 can be provided with an external thread 1c. The first connecting section 121 can be a straight pipe, and the first heat exchange tube 21 can be provided with an internal thread. The first heat exchange tube 21 can be sleeved on the outside of the first connecting section 121, and can be threadedly connected through the external thread 1c on the first connecting section and the internal thread inside the first heat exchange tube 21. Similarly, the outer surface of the second connecting section 131 can be provided with an external thread 1c. The second connecting section 131 can be a straight pipe, and the second heat exchange tube 22 can be provided with an internal thread. The second heat exchange tube 22 can be sleeved on the outside of the second connecting section 131, and can be threadedly connected through the external thread 1c on the second connecting section 131 and the internal thread inside the second heat exchange tube 22. The threaded connection facilitates the assembly of the first heat exchange tube 21 and the second heat exchange tube 22 with the connecting pipe 1, and the threaded fit increases the heat exchange area between the heat exchange tube and the corresponding connecting section, which is beneficial for improving heat exchange efficiency.

[0048] In one embodiment, the inner wall of the connecting pipe 1 may be provided with a protrusion, which may include structural features such as protrusions or internal teeth. The protrusion may be located on the inner wall surface of the arc-shaped bend 11, the inner wall surface of the first extension 12, or the inner wall surface of the second extension 13. The protrusion increases the contact area with the heat exchange medium, which is beneficial for improving heat exchange performance.

[0049] In some other embodiments, the inner wall of the connecting pipe 1 may also be a smooth surface, which is not limited in this embodiment.

[0050] In this embodiment, the material of the connecting pipe 1 can be, but is not limited to, stainless steel, copper, aluminum, and other metallic materials. When stainless steel or copper is used for the connecting pipe 1, the heat exchanger exhibits higher corrosion resistance. While stainless steel has higher strength than copper or aluminum, the connecting pipe 1 made of stainless steel has lower elongation, making it more prone to the aforementioned deformation and wrinkling problems at the bending area. Using the connecting pipe 1 described in this application, even when the connecting pipe 1 is made of stainless steel, problems such as wrinkling, deformation, and thinning of the pipe wall at the bending point can be effectively avoided. This achieves the goal of reducing the heat exchanger tube spacing while ensuring the bending quality at the bending point, thus balancing the heat exchanger's heat transfer performance and the reliability of the connecting pipe's bending point.

[0051] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the technical solutions and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A heat exchanger, characterized in that, include: Multiple heat exchange tubes (2) and multiple connecting tubes (1), wherein the multiple heat exchange tubes (2) have a first heat exchange tube (21) and a second heat exchange tube (22) arranged adjacent to each other, and the first heat exchange tube (21) and the second heat exchange tube (22) are connected through at least one of the connecting tubes (1); The connecting pipe (1) includes an arc-shaped bend (11) along the arrangement direction of the first heat exchange pipe (21) and the second heat exchange pipe (22). The maximum width of the arc-shaped bend (11) is D. There is a first distance H1 between the outer surface of the first heat exchange pipe (21) away from the second heat exchange pipe (22) and the outer surface of the second heat exchange pipe (22) away from the first heat exchange pipe (21), where D > H1.

2. The heat exchanger according to claim 1, characterized in that, The arc-shaped bending segment (11) is circular arc-shaped, and the central angle corresponding to the arc-shaped bending segment (11) is α, 180°<α<270°.

3. The heat exchanger according to claim 1, characterized in that, The connecting pipe (1) further includes a first extension section (12) and a second extension section (13). One end of the arc-shaped bend section (11) is connected to one end of the first extension section (12), and the other end of the arc-shaped bend section (11) is connected to one end of the second extension section (13). The other end of the first extension section (12) is connected to the first heat exchange pipe (21), and the other end of the second extension section (13) is connected to the second heat exchange pipe (22).

4. The heat exchanger according to claim 3, characterized in that, The arc-shaped bending segment (11) includes a first arc segment (111) and a second arc segment (112); Along the arrangement direction of the first heat exchange tube (21) and the second heat exchange tube (22), one end of the first arc-shaped segment (111) away from the second arc-shaped segment (112) protrudes from the surface of the first heat exchange tube (21) away from the second heat exchange tube (22); and / or, Along the arrangement direction of the first heat exchange tube (21) and the second heat exchange tube (22), one end of the second arc segment (112) away from the first arc segment (111) protrudes from the surface of the second heat exchange tube (22) away from the first heat exchange tube (21).

5. The heat exchanger according to claim 4, characterized in that, Along the arrangement direction of the first heat exchange tube (21) and the second heat exchange tube (22), the end of the first arc segment (111) away from the second arc segment (112) protrudes from the surface of the first heat exchange tube (21) away from the second heat exchange tube (22), and the tangent of the end of the second arc segment (112) away from the first arc segment (111) is coplanar with the surface of the second heat exchange tube (22) away from the first heat exchange tube (21).

6. The heat exchanger according to claim 3, characterized in that, The arc-shaped bending segment (11) includes a first arc segment (111), a second arc segment (112), and a straight segment (113). One end of the straight segment (113) is connected to the first arc segment (111), and the other end of the straight segment (113) is connected to the second arc segment (112); The end of the first arc segment (111) away from the straight segment (113) is connected to the first extension segment (12); The end of the second arc segment (112) away from the straight segment (113) is connected to the second extension segment (13).

7. The heat exchanger according to claim 3, characterized in that, The arc-shaped bending section (11), the first extension section (12), and the second extension section (13) are an integral structure.

8. The heat exchanger according to any one of claims 1-7, characterized in that, The arc-shaped bend (11) has an arc-shaped center line C3, the radius of which is R; The first heat exchange tube (21) has a first center line C1, and the second heat exchange tube (22) has a second center line C2. The first center line C1 and the second center line C2 are parallel, and the distance between the first center line C1 and the second center line C2 is H2, where R > H2 / 2.

9. The heat exchanger according to any one of claims 3-7, characterized in that, At least a portion of the first extension segment (12) away from the arc-shaped bend segment (11) is a first connecting segment (121), which is fixedly connected to the first heat exchange tube (21); and / or, At least a portion of the second extension section (13) away from the arc-shaped bend section (11) is a second connecting section (131), which is fixedly connected to the second heat exchange tube (22).

10. The heat exchanger according to claim 9, characterized in that, The outer diameter of the first extension segment (12) and the outer diameter of the second extension segment (13) are both d2, the length of the first connecting segment (121) is L2, and the length of the second connecting segment (131) is L4; The length of the first connecting segment (121) is L2 > d2 / 3; and / or the length of the second connecting segment (131) is L4 > d2 / 3.

11. The heat exchanger according to claim 9, characterized in that, The first connecting segment (121) is a straight pipe, or the end of the first connecting segment (121) away from the arc-shaped bend (11) has a flared end (1a); and / or, The second connecting section (131) is a straight pipe, or the end of the second connecting section (131) away from the arc-shaped bend (11) has a flared end (1b).

12. The heat exchanger according to claim 9, characterized in that, The first connecting section (121) is provided with an internal thread (1d) or an external thread (1c), and the first connecting section (121) is threadedly connected to the first heat exchange tube (21); and / or, The second connecting section (131) is provided with an internal thread (1d) or an external thread (1c), and the second connecting section (131) is threadedly connected to the second heat exchange tube (22).

13. The heat exchanger according to any one of claims 1-7, characterized in that, It also includes multiple fins (3), which are connected to the heat exchange tube (2). The multiple fins (3) are arranged at intervals along the length of the heat exchange tube (2), or the fins (3) are located between adjacent heat exchange tubes (2).

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