Heat exchange tube and heat exchanger

Abstract

The utility model discloses a heat exchange tube and a heat exchanger, and the heat exchange tube comprises a heat exchange tube body; the first connecting piece is detachably connected to the heat exchange tube body; and the corrosion potential of the first connecting piece is lower than that of the heat exchange tube body. The first connecting piece with the corrosion potential lower than that of the heat exchange tube body is detachably connected to the heat exchange tube body, the first connecting piece serves as an anode, the heat exchange tube body serves as a cathode, and the first connecting piece is sacrificed to achieve the anti-corrosion protection effect on the heat exchange tube body; and moreover, the detachable connection is beneficial to replacement of the first connecting piece, and the situation that the protection effect of the first connecting piece is low due to long-time corrosion is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchange tube and a heat exchanger. Background Art

[0002] During the heat exchange process, the heat exchange tubes in the heat exchanger need to be immersed in an aqueous solution containing electrolytes, which causes the heat exchange tubes to be easily corroded, thereby affecting the service life of the heat exchanger.

[0003] In the prior art, the cathodic protection method of sacrificial anode is usually used to protect the heat exchange tube. That is, a metal material with lower corrosion resistance than the heat exchange tube is placed in the heat exchanger. The metal material serves as the anode, the aqueous solution containing electrolyte is used as the conductor, and the heat exchange tube serves as the cathode, so that the metal material is corroded first, thereby protecting the heat exchange tube.

[0004] However, metal materials with low corrosion resistance are placed in an aqueous solution containing electrolytes, and because of their limited protection range, the heat exchange tubes cannot be well protected. Utility Model Content

[0005] The embodiments of the utility model provide a heat exchange tube and a heat exchanger, aiming to solve the problem that the heat exchange tube cannot be well protected because the existing metal material with low corrosion resistance is arranged in an aqueous solution containing electrolyte.

[0006] To solve the above technical problems, the utility model is implemented through the following technical solutions: a heat exchange tube is provided, comprising: a heat exchange tube body; a first connecting piece, wherein the first connecting piece is detachably connected to the heat exchange tube body; wherein the corrosion potential of the first connecting piece is lower than the corrosion potential of the heat exchange tube body.

[0007] Furthermore, the first connecting member includes: two connecting plates, which are respectively arranged on two opposite sides of the heat exchange tube body; and a fixing member, which is detachably connected to the two connecting plates.

[0008] Furthermore, the heat exchange tube body includes: an inner coil; two connecting tubes, the two connecting tubes are respectively connected to the two ends of the inner coil; wherein the two connecting plates are respectively arranged on the opposite sides of the inner coil.

[0009] Furthermore, the inner coil includes a plurality of pipe segments coiled in sequence, the connecting piece extends along the distribution direction of the plurality of pipe segments, and the connecting piece includes: a plurality of fitting portions, each of the fitting portions is fitted with each of the pipe segments; at least one spacer portion, the spacer portion connects two adjacent fitting portions, the spacer portion is located between two adjacent pipe segments, and the fixing piece detachably connects the spacer portions of the two connecting pieces.

[0010] Furthermore, the first connecting member also includes: a reinforcing sheet, which is connected to one of the connecting sheets and extends in a direction away from the other connecting sheet, and the reinforcing sheet is arranged around the periphery of at least one of the fitting portions and at least one of the spacing portions, and the reinforcing sheet is also arranged around the periphery of the fixing member.

[0011] Furthermore, the heat exchange tube includes a plurality of the first connecting members, and the plurality of the first connecting members are arranged at intervals along the winding direction of the inner coil.

[0012] Furthermore, the first connecting member includes: two clamping plates, the two clamping plates are arranged opposite to each other, one ends of the two clamping plates are connected, the other ends of the two clamping plates are separated, and the two clamping plates are detachably clamped on the heat exchange tube body.

[0013] Furthermore, the heat exchange tube body comprises: an inner coil; two connecting tubes, wherein the two connecting tubes are respectively connected to two ends of the inner coil; wherein the two clamping pieces are detachably clamped on the connecting tubes.

[0014] The utility model also provides a heat exchanger, comprising a box body and the heat exchange tube as described above, wherein the heat exchange tube is arranged in the box body.

[0015] Furthermore, the heat exchanger further includes: a second connecting member, the second connecting member is located at a joint in the box body, the second connecting member is connected to the box body, and the corrosion potential of the second connecting member is lower than the corrosion potential of the box body.

[0016] A heat exchange tube and a heat exchanger based on the embodiments of the utility model are detachably connected to the heat exchange tube body through a first connecting piece with a corrosion potential lower than that of the heat exchange tube body. On the one hand, in an aqueous solution environment containing electrolytes, the first connecting piece serves as an anode and the heat exchange tube body serves as a cathode, thereby achieving an anti-corrosion protection effect on the heat exchange tube body at the expense of the first connecting piece. On the other hand, the detachable connection facilitates the replacement of the first connecting piece, thereby preventing the first connecting piece from having a lower protection effect on the heat exchange tube body due to long-term corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a heat exchange tube provided in an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the structure of a connecting piece provided in Embodiment 1 of the utility model;

[0020] Figure 3 A schematic diagram of the structure of another connecting piece provided in the first embodiment of the utility model;

[0021] Figure 4 A schematic diagram of the structure of the clamping piece provided in the second embodiment of the utility model;

[0022] Figure 5 A schematic structural diagram of a heat exchanger provided by an embodiment of the utility model from a first perspective;

[0023] Figure 6 A schematic structural diagram of a heat exchanger from a second perspective provided by an embodiment of the utility model;

[0024] Figure 7 A cross-sectional view AA provided for an embodiment of the utility model;

[0025] Figure 8 A schematic structural diagram of a second connecting member provided in an embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1. Heat exchange tube body; 11. Inner coil; 12. Connecting pipe; 13. Pipe section;

[0028] 2. first connecting member; 21. connecting sheet; 211. fitting portion; 212. spacing portion; 213. connecting hole; 22. reinforcing sheet; 23. clamping sheet;

[0029] 3. Box body; 31. Upper cover; 311. Connecting port; 32. Body; 33. Lower cover; 331. Support member;

[0030] 4. The second connecting piece. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] The technical problem that the heat exchange tubes cannot be well protected is that the existing metal materials with low corrosion resistance are arranged in an aqueous solution containing electrolytes in the prior art.

[0033] Embodiment 1

[0034] See also Figure 1In order to solve the above technical problems, the utility model proposes a heat exchange tube, including a heat exchange tube body 1 and a first connecting member 2, wherein the first connecting member 2 is detachably connected to the heat exchange tube body 1; wherein the corrosion potential of the first connecting member 2 is lower than the corrosion potential of the heat exchange tube body 1.

[0035] In the embodiment of the utility model, the first connecting piece 2 having a lower corrosion potential than the heat exchange tube body 1 is detachably connected to the heat exchange tube body 1. On the one hand, the heat exchange tube is arranged in an aqueous solution environment containing electrolyte, the first connecting piece 2 serves as an anode, and the heat exchange tube body 1 serves as a cathode. Through the cathodic protection method of sacrificial anode, the heat exchange tube body 1 is protected against corrosion by sacrificing the first connecting piece 2. On the other hand, as the first connecting piece 2 is corroded, its protective effect on the heat exchange tube body 1 is gradually reduced. The detachable connection facilitates the disassembly and replacement of the first connecting piece 2, thereby preventing the first connecting piece 2 from having a low protective effect on the heat exchange tube body 1 due to long-term corrosion.

[0036] In the prior art, magnesium strips or magnesium rods are often set on one side of the heat exchange tube as an anode to protect the heat exchange tube from corrosion. However, the metal magnesium is consumed quickly and is easily damaged by untimely replenishment. In a specific embodiment, the heat exchange tube body 1 is made of 316 stainless steel, and the first connecting piece 2 is made of 430 stainless steel. 316 stainless steel has good corrosion resistance. In an aqueous solution containing electrolyte, 430 stainless steel is used as an anode and 316 stainless steel is used as a cathode. The first connecting piece 2 made of 430 stainless steel is corroded first, and the corrosion rate is slow, which can protect the heat exchange tube body 1 made of 316 stainless steel for a long time.

[0037] See also Figure 2-3 In some embodiments, the first connecting member 2 includes two connecting plates 21 and a fixing member (not shown), the two connecting plates 21 are respectively arranged on two opposite sides of the heat exchange tube body 1, and the fixing member is detachably connected to the two connecting plates 21.

[0038] In this embodiment, the two connecting pieces 21 can protect the two opposite sides of the heat exchange tube body 1. The fixing piece can detachably connect the two connecting pieces 21, so that the two connecting pieces 21 are fixed on the heat exchanger body 1, which helps to remove and replace the first connecting piece 2 from the heat exchange tube body 1, thereby preventing the connecting piece 21 from being over-consumed, resulting in a low protective effect on the heat exchange tube body 1. In a specific embodiment, the material of the fixing piece can be the same as or different from that of the connecting piece 21. The corrosion potential of the first connecting piece 2 is lower than that of the heat exchange tube body 1, and the corrosion potential of the two connecting pieces 21 and the fixing piece is lower than that of the heat exchange tube body 1, so that the fixing piece can protect the heat exchange tube body 1 while fixing the connecting piece 21.

[0039] In some embodiments, the heat exchange tube body 1 includes an inner coil 11 and two connecting tubes 12, and the two connecting tubes 12 are respectively connected to the two ends of the inner coil 11; Figure 2 , two connecting pieces 21 are respectively arranged on opposite sides of the inner coil 11; and / or, please refer to Figure 3 The connecting pieces 21 are respectively arranged on two opposite sides of the connecting pipe 12 .

[0040] In this embodiment, the inner coil 11 is used for heating or cooling the fluid, and the two connecting pipes 12 are used for the inflow and outflow of the fluid respectively. The inner coil 11 is wrapped in an aqueous solution containing electrolytes, and the two connecting pieces 21 are respectively arranged on the opposite sides of the inner coil 11, which can effectively protect the inner and outer sides of the inner coil 11, and the two connecting pieces 21 are respectively arranged on the opposite sides of the connecting pipe 12, which can effectively protect the connecting pipe 12. Specifically, the upper and lower ends of the inner coil 11 are respectively bent to connect the two connecting pipes 12, which is conducive to the heat exchange of the fluid in the inner coil 11.

[0041] In a specific embodiment, the inner coil 11 includes a plurality of pipe segments 13 coiled in sequence, and the connecting piece 21 extends along the distribution direction of the plurality of pipe segments 13. The connecting piece 21 includes: a plurality of fitting portions 211 and at least one spacing portion 212. Each fitting portion 211 fits with each pipe segment 13, and the spacing portion 212 connects two adjacent fitting portions 211. The spacing portion 212 is located between two adjacent pipe segments 13, and the fixing piece detachably connects the spacing portions 212 of the two connecting pieces 21.

[0042] In this embodiment, the connecting piece 21 extends along the distribution direction of the plurality of pipe segments 13, which helps each fitting portion 211 to fit each pipe segment 13. The fitting of each fitting portion 211 with each pipe segment 13 can effectively protect each pipe segment 13 from corrosion from the aqueous solution containing electrolyte on the outside. The spacer 212 is arranged between two adjacent pipe segments 13, and the spacers 212 of two connecting pieces 21 are detachably connected by a fixing member, so that the two connecting pieces 21 are fixed on opposite sides of the inner coil 11, thereby effectively protecting the inner coil 11. Specifically, a connecting hole 213 is arranged on the spacer 212, and the fixing member includes a bolt and a nut, and one end of the bolt passes through the two connecting holes 213 on the two opposite spacers 212 of the two connecting pieces 21 in sequence, and is connected to the nut, so that the two connecting pieces 21 are detachably connected. More specifically, the angle between the connecting piece 21 and each pipe segment 13 is between 80° and 100°, which helps each fitting portion 211 to fit each pipe segment 13; in actual application scenarios, the angle between each pipe segment 13 of the inner coil 11 deviates, and the angle between the connecting piece 21 and each pipe segment 13 is 80°, 90° and 100°, which is convenient for corresponding to different pipe segments 13; preferably, the angle between the connecting piece 21 and each pipe segment 13 is 90°, so that each fitting portion 211 corresponds to each pipe segment 13, which is convenient for the fitting of the fitting portion 211.

[0043] Specifically, the fitting portion 211 is in an arc shape, and the radius of the fitting portion 211 on one side of the inner coil 11 is the same as the radius of the outer side of the inner coil 11, so that the fitting portion 211 fits tightly with the inner coil 11, and the spacer portion 212 is in a flat plate shape, which helps to connect the spacer portions 212 of the two connecting plates 21 together through fixings.

[0044] In a more specific embodiment, the first connecting member 2 also includes: a reinforcing sheet 22, which is connected to one of the connecting sheets 21 and extends in a direction away from the other connecting sheet 21, and the reinforcing sheet 22 is arranged around the periphery of at least one fitting portion 211 and at least one spacing portion 212, and the reinforcing sheet 22 is also arranged around the periphery of the fixing member.

[0045] In this embodiment, the reinforcing sheet 22 is used to limit and shape the inner coil 11. The reinforcing sheet 22 spans at least one fitting portion 211, that is, the reinforcing sheet 22 spans at least one pipe section 13. The inner coil 11 is spiral and has compressive elastic force. The reinforcing sheet 22 can further stabilize the connection between the two connecting sheets 21 clamped on both sides of the inner coil 11, preventing the deformation of the inner coil 11 from affecting the protective effect of the first connecting member 2; the reinforcing sheet 22 is arranged around the periphery of the fixing member to facilitate the connection of the reinforcing sheet 22. In a specific embodiment, the first connecting member 2 is provided with three reinforcing sheets 22, which are respectively connected to the two ends and the middle part of the connecting sheet 21, and can better stabilize the inner coil 11. Specifically, the corrosion potential of the reinforcing sheet 22 is lower than the corrosion potential of the heat exchange tube body 1, so that the reinforcing sheet 22 can stabilize the inner coil 11 while also protecting the inner coil 11.

[0046] In another specific embodiment, the inner coil 11 includes a plurality of pipe segments 13 that are bent and turned back in sequence, and the connecting piece 21 extends along the distribution direction of the plurality of pipe segments 13. In this embodiment, the inner coil 11 is wavy, and two connecting pieces 21 are respectively arranged on both sides of the inner coil 11, thereby playing an anti-corrosion role for the inner coil 11.

[0047] In some embodiments, the heat exchange tube includes a plurality of first connectors 2 , and the plurality of first connectors 2 are arranged at intervals along the winding direction of the inner coil 11 .

[0048] In this embodiment, the protection range of each first connecting member 2 is limited. Arranging multiple first connecting members 2 can provide more comprehensive protection for the heat exchange tube body 1. The multiple first connecting members 2 are arranged at intervals along the winding direction of the inner coil 11, that is, the first connecting members 2 are evenly arranged on the inner coil 11, thereby providing all-round protection for the inner coil 11 and effectively preventing the inner coil 11 from corrosion.

[0049] See also Figure 5-8 The utility model also provides a heat exchanger, including a box body 3 and the heat exchange tube as described above, and the heat exchange tube is arranged in the box body 3.

[0050] In this embodiment, the heat exchange tube is arranged in the box body 3. During the heat exchange process, the box body 3 is filled with an aqueous solution containing an electrolyte. The first connecting piece 2 with a corrosion potential lower than the heat exchange tube body 1 is detachably connected to the heat exchange tube body 1, thereby achieving an anti-corrosion protection effect on the heat exchange tube.

[0051] In some embodiments, the heat exchanger further includes: a second connector 4 , which is located at a joint in the housing 3 , is connected to the housing 3 , and has a corrosion potential lower than that of the housing 3 .

[0052] In this embodiment, the corrosion potential of the second connector 4 is lower than that of the box 3. When the heat exchanger is working, the box 3 is filled with an aqueous solution containing electrolytes. The second connector 4 acts as an anode and the box 3 acts as a cathode. The second connector 4 as an anode is corroded first, thereby protecting the box 3 as a cathode to prevent the box 3 from being corroded. To ensure the normal operation of the heat exchanger, it is necessary to prevent the leakage of the aqueous solution in the box 3, that is, the joints in the box 3 need to be kept sealed. Therefore, the second connector 4 is set at the joints in the box 3 to prevent the joints in the box 3 from being corroded. Specifically, the second connector 4 is in the form of a sheet, and the second connector 4 is glued or welded to the joints in the box 3 to protect the box 3.

[0053] In a specific embodiment, the box body 3 includes an upper cover 31, a barrel 32 and a lower cover 33 which are connected in sequence. The upper cover 31 and the barrel 32, and the barrel 32 and the lower cover 33 are connected by welding. A seam is formed between the upper cover 31 and the barrel 32, and a seam is formed between the barrel 32 and the lower cover 33. The second connecting member 4 is arranged at the seam inside the box body 3. The second connecting member 4 is arranged at the inner wall of one end of the upper cover 31 close to the barrel 32, and the second connecting member 4 is arranged at the inner wall of one end of the lower cover 33 close to the barrel 32.

[0054] More specifically, the upper cover 31 is provided with a plurality of connection ports 311 for the inlet and outlet of the electrolyte aqueous solution and the inlet and outlet of the solution to be heat exchanged, and the lower cover 33 is provided with a support member 331 for supporting the entire heat exchanger.

[0055] Embodiment 2

[0056] The difference between the second embodiment and the first embodiment is that, please refer to Figure 4 The first connecting member 2 includes two clamping pieces 23, which are arranged opposite to each other, and one end of the two clamping pieces 23 is connected, and the other ends of the two clamping pieces 23 are separated, and the two clamping pieces 23 are detachably clamped on the heat exchange tube body 1.

[0057] In this embodiment, the two clamping plates 23 are detachably clamped on the heat exchange tube body 1, thereby achieving an anti-corrosion protection effect on the heat exchange tube body 1. The detachable connection allows the first connecting member 2 to change the clamping position and replace the clamping plates 23 in time to prevent the clamping plates 23 from having a low protection effect on the heat exchange tube body 1 due to long-term corrosion. The two clamping plates 23 are detachably clamped on the heat exchange tube body 1 through the clamping force of the two clamping plates 23 themselves, which not only plays an anti-corrosion protection role for the heat exchange tube body 1, but also makes the structure of the first connecting member 2 simple and easy to install.

[0058] In some embodiments, the heat exchange tube body 1 includes: an inner coil 11 and two connecting tubes 12 , wherein the two connecting tubes 12 are respectively connected to two ends of the inner coil 11 ; wherein the two clamping pieces 23 are detachably clamped on the connecting tubes 12 .

[0059] In this embodiment, the two clamping pieces 23 are detachably clamped on the connecting pipe 12, which can effectively prevent the connecting pipe 12 from corrosion. The detachable connection allows the clamping position of the two clamping pieces 23 to be changed according to the position of the connecting pipe 12 immersed in the aqueous solution containing electrolytes, which can more accurately protect the connecting pipe 12. Specifically, the inner coil 11 includes a plurality of pipe sections 13 wound in sequence, and the two clamping pieces 23 are detachably clamped on each pipe section 13 of the inner coil 11, which can effectively protect each pipe section 13 from corrosion from the aqueous solution containing electrolytes on the outside. More specifically, a plurality of first connectors 2 are provided on each pipe section 13, so that the first connectors 2 provide more comprehensive protection for the inner coil 11. More specifically, the two clamping pieces 23 are clamped on one end of the connecting pipe 12 away from the inner coil 11, which helps to provide more comprehensive anti-corrosion protection for the heat exchange tube body 1.

[0060] Embodiment 3

[0061] The difference between the third embodiment and the first embodiment is that the heat exchange tube includes at least two first connectors 2, one of which is similar to the first connector 2 in the first embodiment, including two connectors 21 and a fixing member (not shown), the two connectors 21 are respectively arranged on opposite sides of the heat exchange tube body 1, and the fixing member detachably connects the two connectors 21. Another first connector 2 is similar to the first connector 2 in the second embodiment, including two clamping plates 23, the two clamping plates 23 are arranged opposite to each other, one end of the two clamping plates 23 is connected, the other end of the two clamping plates 23 is separated, and the two clamping plates 23 are detachably clamped on the heat exchange tube body 1.

[0062] In this embodiment, the heat exchange tube includes at least two first connectors 2, and the two different first connectors 2 are helpful to be connected to different positions on the heat exchange tube body 1, so as to provide more comprehensive protection for the heat exchange tube body 1. Specifically, the heat exchange tube body 1 includes an inner coil 11 and two connecting tubes 12, the two connecting tubes 12 are respectively connected to the two ends of the inner coil 11, the two connecting pieces 21 are respectively arranged on the opposite sides of the inner coil 11, and the two clamping pieces 23 are detachably clamped on the two connecting tubes 12. The connecting piece 21 can better protect the opposite sides of the inner coil 11, and the clamping piece 23 can be used to protect the end of the connecting tube 12 far from the inner coil 11, so as to achieve comprehensive protection of the heat exchange tube body 1, and can effectively prevent the heat exchange tube body 1 from being corroded.

[0063] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present utility model, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only to help describe the present utility model and simplify the description, rather than to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present utility model. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat exchange tube, characterized in that: include: Heat exchange tube body; A first connecting member, wherein the first connecting member is detachably connected to the heat exchange tube body; Wherein, the corrosion potential of the first connecting member is lower than the corrosion potential of the heat exchange tube body.

2. The heat exchange tube according to claim 1, characterized in that: The first connecting member comprises: Two connecting plates, the two connecting plates are respectively arranged on two opposite sides of the heat exchange tube body; A fixing piece is used to detachably connect the two connecting pieces.

3. The heat exchange tube according to claim 2, characterized in that: The heat exchange tube body comprises: Inner coil; Two connecting pipes, the two connecting pipes are respectively connected to two ends of the inner coil; Wherein, the two connecting pieces are respectively arranged on two opposite sides of the inner coil.

4. The heat exchange tube according to claim 3, characterized in that: The inner coil includes a plurality of pipe sections coiled in sequence, the connecting piece extends along the distribution direction of the plurality of pipe sections, and the connecting piece includes: A plurality of fitting parts, each of which is fitted with each of the pipe sections; At least one spacer portion, the spacer portion connects two adjacent fitting portions, the spacer portion is located between two adjacent pipe sections, and the fixing member detachably connects the spacer portions of two connecting pieces.

5. The heat exchange tube according to claim 4, characterized in that: The first connecting member further comprises: A reinforcing sheet connected to one of the connecting sheets and extending in a direction away from the other connecting sheet, the reinforcing sheet is arranged around the periphery of at least one of the fitting portions and at least one of the spacing portions, and the reinforcing sheet is also arranged around the periphery of the fixing member.

6. The heat exchange tube according to any one of claims 3 to 5, characterized in that: The heat exchange tube includes a plurality of the first connecting members, and the plurality of the first connecting members are arranged at intervals along the winding direction of the inner coil.

7. The heat exchange tube according to claim 1, characterized in that: The first connecting member comprises: Two clamping plates are arranged opposite to each other, one ends of the two clamping plates are connected, and the other ends of the two clamping plates are separated, and the two clamping plates are detachably clamped on the heat exchange tube body (1).

8. The heat exchange tube according to claim 7, characterized in that: The heat exchange tube body comprises: Inner coil; Two connecting pipes, the two connecting pipes are respectively connected to two ends of the inner coil; Wherein, the two clamping pieces are detachably clamped on the connecting pipe.

9. A heat exchanger, characterized in that: It comprises a box body and a heat exchange tube as claimed in any one of claims 1 to 8, wherein the heat exchange tube is arranged in the box body.

10. The heat exchanger according to claim 9, characterized in that Also includes: The second connecting member is located at a joint in the box body, the second connecting member is connected to the box body, and the corrosion potential of the second connecting member is lower than the corrosion potential of the box body.

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