A heat exchange device

Abstract

The embodiment of the present application provides a heat exchange device, which is convenient to connect with existing equipment. The heat exchange device provided by the embodiment of the present application, the side wall of the shell forms a first inlet and a first outlet, the first medium enters the inside of the shell from the first inlet and leaves the shell from the first outlet; the first heat exchange pipeline, the second heat exchange pipeline and the center pipe are located in the inside of the shell, the side wall is provided with a second inlet and a second outlet, the first heat exchange pipeline is connected with the second inlet and the center pipe, the second heat exchange pipeline is connected with the second outlet and the center pipe, the second medium flows through the first heat exchange pipeline from the second inlet into the center pipe, and then flows through the second heat exchange pipeline from the center pipe to the second outlet, so that the first medium and the second medium realize heat exchange through the first heat exchange pipeline, the second heat exchange pipeline and the center pipe; and since the second inlet and the second outlet are arranged on the side wall, it is convenient to connect with existing equipment.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and more particularly to a heat exchange device. Background Technology

[0002] In the process of recovering gas heat, commonly used high-flow-rate gas indirect heat exchangers, such as finned tube and flat plate types, are very bulky and cannot be directly installed on the exhaust port; moreover, high-flow-rate gas indirect heat exchangers require additional floor space and are inconvenient to connect with existing equipment. Utility Model Content

[0003] This application provides a heat exchange device designed to facilitate connection with existing equipment.

[0004] On one hand, an embodiment of this application provides a heat exchange device including a shell, a central tube, a first heat exchange pipe, and a second heat exchange pipe. The shell includes a sidewall that encloses a first inlet and a first outlet. A second inlet and a second outlet are provided at intervals on the sidewall. The shell is used to circulate a first medium. The central tube is located inside the shell and its two ends are closed. The first heat exchange pipe is located inside the shell and connects the second inlet and the central tube. The second heat exchange pipe is located inside the shell and connects the central tube and the second outlet. The central tube, the first heat exchange pipe, and the second heat exchange pipe are used to circulate a second medium.

[0005] The heat exchange device provided in this application embodiment has a first inlet and a first outlet formed by the sidewalls of the shell. A first medium enters the shell from the first inlet and exits from the first outlet. A first heat exchange pipe, a second heat exchange pipe, and a central pipe are all located inside the shell. A second inlet and a second outlet are provided on the sidewalls. The first heat exchange pipe connects the second inlet and the central pipe, and the second heat exchange pipe connects the second outlet and the central pipe. The second medium flows from the second inlet through the first heat exchange pipe into the central pipe, and then flows from the central pipe through the second heat exchange pipe and out of the second outlet, so that the first medium and the second medium achieve heat exchange through the first heat exchange pipe, the second heat exchange pipe, and the central pipe. Since both the second inlet and the second outlet are located on the sidewalls, it is convenient to connect with existing equipment. Furthermore, the fact that both the second inlet and the second outlet are located on the sidewalls also ensures smooth flow of the first medium within the shell.

[0006] In some embodiments, the first heat exchange pipe and the second heat exchange pipe are spaced apart along the extension direction of the central pipe.

[0007] The above configuration allows the first and second heat exchange pipes to make full use of the space within the casing.

[0008] In some embodiments, the heat exchange device further includes a connecting plate disposed between the first heat exchange pipe and the second heat exchange pipe, with one end of the connecting plate connected to the first heat exchange pipe and the other end of the connecting plate connected to the second heat exchange pipe.

[0009] With the above configuration, the connecting plate connects the first heat exchange pipe and the second heat exchange pipe. Heat from both the first and second heat exchange pipes can be transferred to the connecting plate, increasing the total surface area of ​​both pipes and further improving the heat exchange efficiency of the first and second media. Simultaneously, the connecting plate integrates the first and second heat exchange pipes, forming a unified structure and enhancing their structural strength.

[0010] In some embodiments, the first heat exchange pipe is arranged to be coiled around the central pipe in the circumferential direction.

[0011] The above settings increase the surface area of ​​the first heat exchange pipe and the flow time of the second medium in the first heat exchange pipe, both of which can improve the heat exchange efficiency of the first and second media.

[0012] In some embodiments, the second heat exchange pipe is arranged to coil around the central pipe in the circumferential direction.

[0013] The above settings increase the surface area of ​​the second heat exchange pipe and the flow time of the second medium in the second heat exchange pipe, both of which can improve the heat exchange efficiency of the first and second media.

[0014] In some embodiments, the heat exchange device further includes a first support plate; one end of the first support plate is connected to a portion of the first heat exchange pipe located in the inner ring, and the other end of the first support plate is connected to a portion of the first heat exchange pipe located in the outer ring.

[0015] With the above configuration, the first support plate can fix the distance between the inner and outer rings of the first heat exchange pipe, and can also resist the deformation stress of the coiled first heat exchange pipe, thus preventing the first heat exchange pipe from deforming.

[0016] In some embodiments, the heat exchange device further includes a second support plate; one end of the second support plate is connected to a portion of the second heat exchange pipe located in the inner ring, and the other end of the second support plate is connected to a portion of the second heat exchange pipe located in the outer ring.

[0017] With the above configuration, the second support plate can fix the distance between the inner and outer rings of the second heat exchange pipe, and can also resist the deformation stress of the coiled second heat exchange pipe, thus preventing the first heat exchange pipe from deforming.

[0018] In some embodiments, the heat exchange device further includes a first fixing belt, which is located between the first heat exchange pipe and the side wall, and the first fixing belt surrounds the first heat exchange pipe;

[0019] The above settings are used to counteract the deformation stress of the coiled first heat exchange pipe and prevent the first heat exchange pipe from deforming.

[0020] In some embodiments, the heat exchange device further includes a second fixing belt located between the second heat exchange pipe and the side wall, and the second fixing belt surrounds the second heat exchange pipe.

[0021] The above settings are used to counteract the deformation stress of the coiled second heat exchange pipe and prevent the second heat exchange pipe from deforming.

[0022] In some embodiments, the dimension of the first heat exchange pipe in the direction of extension of the central pipe is greater than the dimension of the first heat exchange pipe in the direction of extension of the central pipe.

[0023] With the above configuration, the first heat exchange pipe can make full use of the internal space of the shell, increasing the heat exchange time between the first medium and the second medium; at the same time, it can prevent the first heat exchange pipe from blocking the flow of the first medium inside the shell.

[0024] In some embodiments, the dimension of the second heat exchange pipe in the direction of extension of the central pipe is greater than the dimension of the second heat exchange pipe in the direction of extension of the central pipe.

[0025] With the above configuration, the second heat exchange pipe can make full use of the internal space of the shell, increasing the heat exchange time between the first medium and the second medium; at the same time, it avoids the second heat exchange pipe from blocking the flow of the first medium inside the shell.

[0026] In some embodiments, multiple first support plates may be provided, and the multiple first support plates are arranged in the radial direction of the central tube to fix the first heat exchange pipe; multiple second support plates may be provided, and the multiple second support plates are arranged in the radial direction of the central tube to fix the second heat exchange pipe.

[0027] In some embodiments, a plurality of first support plates are located in the same plane, and two adjacent first support plates along the radial direction of the central tube are staggered in the circumferential direction of the central tube.

[0028] With the above configuration, when the first medium passes through multiple first support plates staggered in the circumferential direction of the central tube, the first support plates can generate turbulence in the first medium (gas), reduce the flow velocity of the first medium in the first shell, thereby increasing the heat exchange time of the first medium inside the shell and improving the heat exchange efficiency of the first medium and the second medium.

[0029] In some embodiments, a plurality of second support plates are located in the same plane, and two adjacent second support plates along the radial direction of the central tube are staggered in the circumferential direction of the central tube.

[0030] With the above configuration, when the first medium passes through multiple second support plates that are staggered in the circumferential direction of the central tube, the second support plates can also cause the first medium (gas) to generate turbulence, reduce the flow velocity of the first medium in the first shell, thereby increasing the heat exchange time of the first medium inside the shell and improving the heat exchange efficiency of the first medium and the second medium.

[0031] In the above embodiments, the plurality of first support plates may also be staggered in the extension direction of the central tube; the plurality of second support plates may also be staggered in the extension direction of the central tube. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the heat exchange device in the embodiments of this application. Figure 1 ;

[0033] Figure 2 This is a schematic diagram of the heat exchange device in the embodiments of this application. Figure 2 ;

[0034] Figure 3 This is a schematic diagram of the heat exchange device in the embodiments of this application. Figure 3 ;

[0035] Figure 4 This is a schematic diagram of the heat exchange device in the embodiments of this application. Figure 4 .

[0036] Reference numerals: 100, heat exchanger; 10, shell; 11, side wall; 12, first inlet; 13, first outlet; 14, second inlet; 15, second outlet; 20, central tube; 30, first heat exchange pipe; 31, first support plate; 40, second heat exchange pipe; 41, second support plate; 50, connecting plate; Detailed Implementation

[0037] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0038] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0039] This application provides a heat exchange device 100, which includes a housing 10. The housing 10 includes sidewalls 11, which enclose a first inlet 12 and a first outlet 13. The housing 10 is used for the flow of a first medium, wherein the first medium is a gas. The gas enters the interior of the housing 10 through the first inlet 12 and exits the interior of the housing 10 through the first outlet 13. In some embodiments, the sidewalls 11 of the housing 10 are cylindrical, and the first inlet 12 and the first outlet 13 are arranged opposite each other along the height direction of the cylinder. For example, the first inlet 12 is located below the housing 10, and the first outlet 13 is located above the housing 10 to facilitate the flow of gas within the housing 10. In other embodiments, the housing 10 may have other shapes, as long as the housing 10 has a first inlet 12 and a first outlet 13 communicating with the interior of the housing 10.

[0040] The heat exchange device 100 also includes a central tube 20, which is located inside the shell 10. One end of the central tube 20 is close to the first inlet 12, and the other end of the central tube 20 is close to the first outlet 13. In the embodiment where the shell 10 is cylindrical, the extension direction of the central tube 20 is the same as the height direction of the cylinder.

[0041] The heat exchange device 100 also includes a first heat exchange pipe 30 and a second heat exchange pipe 40, both located inside the housing 10. A second inlet 14 and a second outlet 15 are spaced apart on the side wall 11. The first heat exchange pipe 30 connects the second inlet 14 and the central pipe 20, and the second heat exchange pipe 40 connects the second outlet 15 and the central pipe 20. The first heat exchange pipe 30, the second heat exchange pipe 40, and the central pipe 20 are used to circulate a second medium, which is a liquid. The liquid flows from the second inlet 14 through the first heat exchange pipe 30 into the central pipe 20, and then flows from the central pipe 20 through the second heat exchange pipe 40 out of the second outlet 15.

[0042] The heat exchange device 100 provided in this application embodiment has a first inlet 12 and a first outlet 13 enclosed by the side wall 11 of the shell 10. The first medium enters the interior of the shell 10 from the first inlet 12 and exits the shell 10 from the first outlet 13. The first heat exchange pipe 30, the second heat exchange pipe 40, and the central pipe 20 are all located inside the shell 10. The side wall 11 is provided with a second inlet 14 and a second outlet 15. The first heat exchange pipe 30 connects the second inlet 14 and the central pipe 20, and the second heat exchange pipe 40 connects the second outlet 15 and the central pipe 20. The second medium flows from the second inlet 14 through the first heat exchange pipe 30 into the central pipe 20, and flows from the central pipe 20 through the second heat exchange pipe 40 out of the second outlet 15, so that the first medium and the second medium achieve heat exchange through the first heat exchange pipe 30, the second heat exchange pipe 40, and the central pipe 20. Since the second inlet 14 and the second outlet 15 are both provided on the side wall 11, it is convenient to connect with existing equipment. Furthermore, the second inlet 14 and the second outlet 15 are both located on the side wall 11, which can also ensure that the first medium flows smoothly within the housing 10.

[0043] The heat exchange device 100 provided in this application can be used to recover heat from high-temperature flue gas. The heat exchange device 100 is positioned above the exhaust pipe; the first inlet 12 is connected to the exhaust pipe via a flange, and the flue gas enters the housing 10 through the first inlet 12 and exits the housing 10 through the first outlet 13; the second inlet 14 and the second outlet 15 can be connected to a water circulation device, which directs water through the second inlet 14, through the first heat exchange pipe 30, into the central pipe 20, and then through the central pipe 20, through the second heat exchange pipe 40, and out of the second outlet 15. This process heats the water using the heat from the flue gas, thus recovering the heat from the flue gas and improving energy efficiency.

[0044] The heat exchange device 100 provided in this application can also be used to preheat gas. The heat exchange device 100 is positioned below the device requiring high-temperature air. The first outlet 13 is connected to the air inlet of the device requiring high-temperature air. The second inlet 14 and the second outlet 15 can be connected to a water circulation device. The water circulation device directs hot water through the second inlet 14, through the first heat exchange pipe 30, into the central pipe 20, and then through the central pipe 20, through the second heat exchange pipe 40, and out of the second outlet 15. The hot water flowing through the first heat exchange pipe 30, the second heat exchange pipe 40, and the central pipe 20 heats the air inside the shell 10. The heated air rises, and cold air is drawn into the shell 10 through the first inlet 12. This process is repeated to achieve gas preheating.

[0045] In some embodiments, the second inlet 14 is located below the second outlet 15, that is, the second inlet 14 is closer to the ground than the first inlet 12. In this case, when the second medium is a liquid, the flow time of the second medium in the first heat exchange pipe 30, the second heat exchange pipe 40 and the central pipe 20 can be increased, thereby improving the heat exchange effect between the first medium and the second medium.

[0046] In some embodiments, the first heat exchange pipe 30 and the second heat exchange pipe 40 are spaced apart along the extension direction of the central pipe 20 so that the first heat exchange pipe 30 and the second heat exchange pipe 40 can make full use of the space inside the housing 10.

[0047] In conjunction with the above embodiments, since the second inlet 14 is located below the second outlet 15, the first heat exchange pipe 30 is also located below the second heat exchange pipe 40. The first medium enters the interior of the shell 10 from the first inlet 12, first passes through the first heat exchange pipe 30, and exchanges heat with the second medium flowing through the first heat exchange pipe 30; the first medium then passes through the second heat exchange pipe 40 and exchanges heat with the second medium flowing through the second heat exchange pipe 40, which increases the heat exchange time between the first medium and the second medium and improves the heat exchange efficiency.

[0048] In some embodiments, the heat exchange device 100 further includes a connecting plate 50, which is disposed between the first heat exchange pipe 30 and the second heat exchange pipe 40. One end of the connecting plate 50 is connected to the first heat exchange pipe 30, and the other end of the connecting plate 50 is connected to the second heat exchange pipe 40. The connecting plate 50 connects the first heat exchange pipe 30 and the second heat exchange pipe 40, allowing heat from both the first and second heat exchange pipes to be transferred to the connecting plate 50. This increases the total surface area of ​​the first and second heat exchange pipes 30 and 40, further improving the heat exchange efficiency of the first and second media. Simultaneously, the connecting plate 50 connects the first heat exchange pipe 30 and the second heat exchange pipe 40, forming a single unit and improving the structural strength of both.

[0049] In some embodiments, the first heat exchange pipe 30 is coiled around the central pipe 20 in the circumferential direction, that is, the first heat exchange pipe 30 is spiral inside the shell 10, which increases the surface area of ​​the first heat exchange pipe 30 itself and also increases the flow time of the second medium in the first heat exchange pipe 30, both of which can improve the heat exchange efficiency of the first medium and the second medium.

[0050] Similarly, the second heat exchange pipe 40 is coiled around the central pipe 20 in the circumferential direction, that is, the second heat exchange pipe 40 is spiral inside the shell 10, which increases the surface area of ​​the second heat exchange pipe 40 itself and also increases the flow time of the second medium in the second heat exchange pipe 40, both of which can improve the heat exchange efficiency of the first medium and the second medium.

[0051] In some embodiments, the dimension of the first heat exchange pipe 30 in the extension direction of the central pipe 20 is larger than the dimension of the first heat exchange pipe 30 in the radial direction of the central pipe 20. The larger dimension of the first heat exchange pipe 30 in the extension direction of the central pipe 20 allows it to fully utilize the internal space of the shell 10, increasing the heat exchange time between the first and second media; the smaller dimension of the first heat exchange pipe 30 in the radial direction of the central pipe 20 prevents it from obstructing the flow of the first media inside the shell 10.

[0052] In the above embodiment, the first heat exchange pipe 30 includes a first part, a second part, and a third part. The first part connects the second inlet 14 and the second part, and the third part connects the second part and the central pipe 20. The second part is arranged to coil around the central pipe 20. The channel size of the second part is equal everywhere. The channel size of the first part gradually decreases from the end connected to the second inlet to the end connected to the second part to reduce the impact force of the second medium on the first heat exchange pipe. The channel size of the third part gradually decreases from the end connected to the central pipe 20 to the end connected to the second part to reduce the impact force of the second medium on the central pipe.

[0053] In some embodiments, the dimension of the second heat exchange pipe 40 in the extension direction of the central pipe 20 is larger than the dimension of the second heat exchange pipe 40 in the radial direction of the central pipe 20. The larger dimension of the second heat exchange pipe 40 in the extension direction of the central pipe 20 allows it to fully utilize the internal space of the shell 10, increasing the heat exchange time between the first and second media; the smaller dimension of the second heat exchange pipe 40 in the radial direction of the central pipe 20 prevents it from obstructing the flow of the first media inside the shell 10.

[0054] In the above embodiment, the second heat exchange pipe 40 includes a fourth part, a fifth part, and a sixth part. The fourth part connects the central pipe 20 and the fifth part, and the sixth part connects the fifth part and the second outlet 15. The fifth part is arranged around the central pipe 20. The channel size of the fifth part is equal everywhere. The channel size of the fourth part gradually decreases from the end connected to the central pipe to the end connected to the fifth part to reduce the impact force of the second medium on the central pipe. The channel size of the sixth part gradually decreases from the end connected to the second outlet 15 to the end connected to the second part to reduce the impact force of the second medium on the second heat exchange pipe 40.

[0055] In the above embodiments, the first heat exchange pipe 30, which is coiled, forms a plurality of first gaps spaced apart along the radial direction of the central pipe 20, and the second heat exchange pipe 40, which is coiled, forms a plurality of second gaps spaced apart along the radial direction of the central pipe 20. The first gaps and the second gaps are correspondingly arranged in the extension direction of the central pipe 20 to ensure the flow of the first medium inside the shell 10.

[0056] In some embodiments, the heat exchange device 100 further includes a first fixing band and a second fixing band. The first fixing band is located between the first heat exchange pipe 30 and the side wall 11, and surrounds the first heat exchange pipe 30 to counteract the deformation stress of the coiled first heat exchange pipe 30 and prevent deformation of the first heat exchange pipe 30. The second fixing band is located between the second heat exchange pipe 40 and the side wall 11, and surrounds the second heat exchange pipe 40 to counteract the deformation stress of the coiled second heat exchange pipe 40 and prevent deformation of the second heat exchange pipe 40.

[0057] In some embodiments, the heat exchange device 100 further includes a third fixing band located on the side of the first heat exchange pipe 30 opposite to the second heat exchange pipe 40. The third fixing band can fit against the first heat exchange pipe 30 to prevent deformation of the first heat exchange pipe 30 in the extension direction of the central pipe 20. Exemplarily, the third fixing band can be disposed within the housing 10 or at the first inlet 12. The heat exchange device 100 further includes a fourth fixing band located on the side of the second heat exchange pipe 40 opposite to the first heat exchange pipe 30. The fourth fixing band can fit against the second heat exchange pipe 40 to prevent deformation of the second heat exchange pipe 40 in the extension direction of the central pipe 20. Exemplarily, the fourth fixing band can be disposed within the housing 10 or at the first outlet 13.

[0058] In some embodiments, the heat exchange device 100 further includes a first support plate 31. One end of the first support plate 31 is connected to the inner portion of the first heat exchange pipe 30, and the other end is connected to the outer portion of the first heat exchange pipe 30. The first support plate 31 can fix the distance between the inner and outer portions of the first heat exchange pipe 30, and can also resist the deformation stress of the coiled first heat exchange pipe 30, preventing deformation of the first heat exchange pipe 30. In the above embodiments, multiple first support plates 31 can be provided, and the multiple first support plates 31 are arranged in the radial direction of the central tube 20 to fix the first heat exchange pipe 30.

[0059] The heat exchange device 100 also includes a second support plate 41. One end of the second support plate 41 is connected to the inner portion of the second heat exchange pipe 40, and the other end is connected to the outer portion of the second heat exchange pipe 40. The second support plate 41 can fix the distance between the inner and outer portions of the second heat exchange pipe 40, and can also resist the deformation stress of the coiled second heat exchange pipe 40, preventing the first heat exchange pipe 30 from deforming. In the above embodiment, multiple second support plates 41 can also be provided, and multiple second support plates 41 are arranged in the radial direction of the central tube 20 to fix the second heat exchange pipe 40.

[0060] In some embodiments, a plurality of first support plates 31 are located in the same plane, and two adjacent first support plates 31 along the radial direction of the central tube 20 are staggered in the circumferential direction of the central tube 20. When the first medium passes through the plurality of first support plates 31 staggered in the circumferential direction of the central tube 20, the first support plates 31 can cause turbulence in the first medium (gas), reduce the flow velocity of the first medium in the first shell 10, thereby increasing the heat exchange time of the first medium inside the shell 10 and improving the heat exchange efficiency of the first medium and the second medium.

[0061] Similarly, multiple second support plates 41 are located in the same plane, and two adjacent second support plates 41 along the radial direction of the central tube 20 are staggered in the circumferential direction of the central tube 20. When the first medium passes through the multiple second support plates 41 staggered in the circumferential direction of the central tube 20, the second support plates 41 can also cause the first medium (gas) to generate turbulence, reduce the flow velocity of the first medium in the first shell 10, thereby increasing the heat exchange time of the first medium inside the shell 10 and improving the heat exchange efficiency of the first medium and the second medium.

[0062] In the above embodiments, the plurality of first support plates 31 may also be staggered in the extension direction of the central tube 20; the plurality of second support plates 41 may also be staggered in the extension direction of the central tube 20.

[0063] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0064] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0065] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A heat exchange device, characterized in that, include: A housing, the housing including a sidewall enclosing a first inlet and a first outlet, and a second inlet and a second outlet spaced apart on the sidewall, the housing being used for the flow of a first medium; A central tube, located inside the housing, with both ends of the central tube closed; A first heat exchange pipe is located inside the shell and connects the second inlet and the central pipe. The second heat exchange pipe is located inside the shell and connects the central pipe and the second outlet. The central pipe, the first heat exchange pipe, and the second heat exchange pipe are used to circulate the second medium.

2. The heat exchange device according to claim 1, characterized in that, The first heat exchange pipe and the second heat exchange pipe are spaced apart along the extension direction of the central pipe.

3. The heat exchange device according to claim 2, characterized in that, The heat exchange device further includes a connecting plate, which is disposed between the first heat exchange pipe and the second heat exchange pipe. One end of the connecting plate is connected to the first heat exchange pipe, and the other end of the connecting plate is connected to the second heat exchange pipe.

4. The heat exchange device according to claim 2 or 3, characterized in that, The first heat exchange pipe is coiled around the central pipe in the circumferential direction, and the second heat exchange pipe is coiled around the central pipe in the circumferential direction.

5. The heat exchange device according to claim 4, characterized in that, The heat exchange device further includes a first support plate and a second support plate; one end of the first support plate is connected to the portion of the first heat exchange pipe located in the inner ring, and the other end of the first support plate is connected to the portion of the first heat exchange pipe located in the outer ring; one end of the second support plate is connected to the portion of the second heat exchange pipe located in the inner ring, and the other end of the second support plate is connected to the portion of the second heat exchange pipe located in the outer ring.

6. The heat exchange device according to claim 4, characterized in that, The heat exchange device further includes a first fixing belt and a second fixing belt. The first fixing belt is located between the first heat exchange pipe and the side wall and surrounds the first heat exchange pipe. The second fixing belt is located between the second heat exchange pipe and the side wall and surrounds the second heat exchange pipe.

7. The heat exchange device according to claim 5 or 6, characterized in that, The dimension of the first heat exchange pipe in the extension direction of the central pipe is larger than the dimension of the first heat exchange pipe in the extension direction of the central pipe. The dimension of the second heat exchange pipe in the direction of extension of the central pipe is greater than the dimension of the second heat exchange pipe in the direction of extension of the central pipe.

8. The heat exchange device according to claim 7, characterized in that, Multiple first support plates may be provided, and the multiple first support plates are arranged in the radial direction of the central tube to fix the first heat exchange pipe. Multiple second support plates may be provided, and the multiple second support plates are arranged in the radial direction of the central tube to fix the second heat exchange pipe.

9. The heat exchange device according to claim 8, characterized in that, Multiple first support plates are located in the same plane, and two adjacent first support plates along the radial direction of the central tube are staggered in the circumferential direction of the central tube; Multiple second support plates are located in the same plane, and two adjacent second support plates along the radial direction of the central tube are staggered in the circumferential direction of the central tube.

10. The heat exchange device according to claim 8, characterized in that, Multiple first support plates are staggered in the extension direction of the central tube; multiple second support plates are staggered in the extension direction of the central tube.

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