Double-pipe heat exchanger and heat exchange system

Abstract

The embodiment of the utility model provides a double-pipe heat exchanger and a heat exchange system, and relates to the technical field of double-pipe heat exchangers. The double-pipe heat exchanger comprises an inner pipe and an outer pipe, the pipe wall of the inner pipe is in a threaded shape, a first heat exchange space is formed in the inner pipe, the inner pipe is provided with a first liquid inlet and a first liquid outlet, and the first liquid inlet and the first liquid outlet are both communicated with the first heat exchange space. The inner pipe is sleeved with the outer pipe, and a second heat exchange space is defined by the inner wall of the outer pipe and the outer wall of the inner pipe; the outer pipe is provided with a second liquid inlet and a second liquid outlet, and the second liquid inlet and the second liquid outlet both communicate with the second heat exchange space. By arranging the pipe wall of the inner pipe to be in the thread shape, the surface tension effect of the inner pipe can be changed, the flowing path of fluid can be optimized, bending and resistance can be reduced, the fluid can flow more smoothly, therefore, pressure loss in the double-pipe heat exchanger is reduced, pressure drop is effectively reduced, and the working efficiency and performance of the heat exchange pipe sleeve are improved.

Description

Technical Field

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

[0002] A shell-and-tube heat exchanger is a common heat exchange device whose basic operating principle relies primarily on heat conduction between inner and outer tubes. Fluid flow between the inner and outer tubes transfers heat, thereby achieving heat recovery or temperature regulation. In a shell-and-tube heat exchanger, the inner tube typically serves as a passage for either the hot or cold fluid, while the outer tube surrounds the inner tube, creating a heat exchange space. As the hot fluid flows through the inner tube, the heat it carries is transferred through the inner tube wall to the outer tube. The cold fluid in the outer tube then absorbs this heat, achieving heat transfer. Similarly, if the fluid in the inner tube is cold, the hot fluid in the outer tube transfers heat to the inner fluid. The heat exchange efficiency of a shell-and-tube heat exchanger is affected by a variety of factors, such as the gap between the inner and outer tubes, the fluid flow rate and flow rate, and the fluid's thermal conductivity, all of which directly impact the heat exchange effect.

[0003] However, when the temperature of the domestic hot water tank is high, the refrigerant in most of the current shell and tube heat exchangers is almost in a gaseous state. The pressure drop of the gaseous refrigerant when passing through the current shell and tube heat exchanger is very large, which will cause the heat exchange capacity of the heat exchange system to decay. Utility Model Content

[0004] The utility model provides a tube-in-tube heat exchanger, which can reduce pressure drop and improve the working efficiency and performance of the tube-in-tube heat exchanger.

[0005] The embodiment of the present utility model can be implemented as follows:

[0006] An embodiment of the present invention provides a double-tube heat exchanger, comprising:

[0007] an inner tube, wherein the inner tube has a threaded wall, a first heat exchange space is formed in the inner tube, and the inner tube has a first liquid inlet and a first liquid outlet, wherein the first liquid inlet and the first liquid outlet are both in communication with the first heat exchange space;

[0008] An outer tube is sleeved on the outer side of the inner tube, and the inner wall of the outer tube and the outer wall of the inner tube form a second heat exchange space; the outer tube has a second liquid inlet and a second liquid outlet, and the second liquid inlet and the second liquid outlet are both connected to the second heat exchange space.

[0009] In an optional embodiment, the double-tube heat exchanger includes a first pipe section, a first connecting pipe, and a second pipe section connected in sequence, and the double-tube heat exchanger is U-shaped.

[0010] In an optional embodiment, the first pipe section is provided with the first liquid inlet and the second liquid outlet at one end away from the first connecting pipe;

[0011] A first liquid outlet and a second liquid inlet are provided at one end of the second pipe section away from the first connecting pipe.

[0012] In an optional embodiment, a second connecting pipe is provided at both the first liquid inlet and the first liquid outlet, and the second connecting pipe is used to connect the inner pipe with the external pipe.

[0013] In an optional embodiment, the double-tube heat exchanger further includes a reinforcing plate, one end of the reinforcing plate is connected to the first pipe segment, and the other end of the reinforcing plate is connected to the second pipe segment.

[0014] In an optional embodiment, there are multiple reinforcing plates, and the multiple reinforcing plates are arranged at intervals along the axial direction of the first pipe segment.

[0015] An embodiment of the present utility model further provides a heat exchange system, comprising the double-tube heat exchanger described in any of the above embodiments, a water tank, a hot water pump, a compressor, a connecting valve, and a first heat exchanger, wherein the connecting valve comprises a first valve port, a second valve port, a third valve port, and a fourth valve port;

[0016] The outlet of the compressor is connected to the second liquid inlet, the first liquid outlet is connected to the water tank, the water tank is connected to the first liquid inlet, and a hot water pump is provided between the water tank and the first liquid inlet, the second liquid outlet is connected to the first valve port, the second valve port is connected to the first inlet of the first heat exchanger, the third valve port is connected to the first outlet of the first heat exchanger, and the fourth valve port is connected to the inlet of the compressor.

[0017] In an optional embodiment, the shell and tube heat exchanger is U-shaped, and the shell and tube heat exchanger is installed in an "inverted U" shape.

[0018] In an optional embodiment, the heat exchange system further includes a second heat exchanger and an expansion valve, the second valve port is connected to the inlet of the second heat exchanger, the outlet of the second heat exchanger is connected to the first inlet of the first heat exchanger, and an expansion valve is further provided between the first inlet of the first heat exchanger and the outlet of the second heat exchanger.

[0019] In an optional embodiment, the expansion valve is an electronic expansion valve.

[0020] The beneficial effects of the shell and tube heat exchanger and the heat exchange system of the embodiment of the utility model include:

[0021] This double-tube heat exchanger includes an inner tube and an outer tube. The inner tube has a threaded wall, forming a first heat exchange space within the inner tube. The inner tube has a first liquid inlet and a first liquid outlet, both of which are connected to the first heat exchange space. The outer tube is sleeved over the inner tube, with the inner and outer walls of the outer tube forming a second heat exchange space. The outer tube has a second liquid inlet and a second liquid outlet, both of which are connected to the second heat exchange space. Liquids of different temperatures are introduced into the first and second heat exchange spaces, respectively, to achieve heat exchange and meet the requirements of the heat exchange system. By configuring the inner tube wall in a threaded shape, the surface tension of the inner tube is altered, optimizing the fluid flow path, reducing bends and resistance, and allowing the fluid to flow more smoothly, thereby reducing pressure loss in the double-tube heat exchanger. This effectively reduces pressure drop and improves the efficiency and performance of the heat exchange tube sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a double-tube heat exchanger provided in an embodiment of the present utility model;

[0024] Figure 2 A partial exploded schematic diagram of a double-tube heat exchanger provided in an embodiment of the present utility model;

[0025] Figure 3 A schematic diagram of the inner tube wall of a double-tube heat exchanger provided in an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of a heat exchange system provided in an embodiment of the present utility model.

[0027] Icons: 1000-heat exchange system; 100-shell heat exchanger; 110-inner tube; 111-first liquid inlet; 112-first liquid outlet; 120-outer tube; 121-second liquid inlet; 122-second liquid outlet; 130-first pipe section; 140-first connecting pipe; 150-second pipe section; 160-second connecting pipe; 170-reinforcement plate; 180-first heat exchange space; 190-second heat exchange space; 200-water tank; 300-compressor; 400-connecting valve; 410-first valve port; 420-second valve port; 430-third valve port; 440-fourth valve port; 500-first heat exchanger; 600-second heat exchanger; 700-expansion valve; 800-hot water pump. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0033] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0034] The double-tube heat exchanger 100 is a common heat exchange device. Its basic operating principle relies primarily on heat conduction between inner and outer tubes 120. Fluid flow between the inner and outer tubes 120 enables heat transfer and recovery, thereby achieving heat recovery or temperature regulation. In the double-tube heat exchanger 100, the inner tube 110 typically serves as a passage for either hot or cold fluid, while the outer tube 120 surrounds the inner tube 110, creating a heat exchange space. When the hot fluid flows through the inner tube 110, the heat it carries is transferred through the inner tube 110 wall to the outer tube 120. The cold fluid in the outer tube 120 absorbs this heat, achieving heat transfer. Similarly, if the fluid in the inner tube 110 is cold, the hot fluid in the outer tube 120 transfers heat to the fluid in the inner tube 110. The heat exchange efficiency of the double-tube heat exchanger 100 is affected by various factors, such as the gap size between the inner and outer tubes 120, the flow rate and flow rate of the fluids, and the thermal conductivity of the fluids, all of which directly impact the heat exchange effect. However, when the temperature of the domestic hot water tank 200 is high, the refrigerant in most of the current shell and tube heat exchangers 100 is almost in gaseous state. The pressure drop of the gaseous refrigerant when passing through the current shell and tube heat exchanger 100 is very large, which will cause the heat exchange capacity of the heat exchange system 1000 to decay.

[0035] Based on this, see Figure 1 、 Figure 2 and Figure 3 The double-tube heat exchanger 100 provided in the embodiments of the present invention can effectively improve the aforementioned technical problems. The double-tube heat exchanger 100 can reduce pressure drop and improve the operating efficiency and performance of the double-tube heat exchanger 100. The double-tube heat exchanger 100 is applied to a heat exchange system 1000. The heat exchange system 1000 having the double-tube heat exchanger 100 also has the same functions as described above, which will not be described in detail here.

[0036] Figure 1 A schematic diagram of a double-tube heat exchanger 100 provided in an embodiment of the present utility model; Figure 2 A partial exploded schematic diagram of a double-tube heat exchanger 100 provided in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the tube wall of the inner tube 110 of the double-tube heat exchanger 100 provided in an embodiment of the present invention.

[0037] like Figure 1 、 Figure 2 and Figure 3As shown, the shell-and-tube heat exchanger 100 provided in an embodiment of the present invention includes an inner tube 110 and an outer tube 120. The inner tube 110 has a threaded wall, forming a first heat exchange space 180 within the inner tube 110. The inner tube 110 has a first liquid inlet 111 and a first liquid outlet 112, both of which are in communication with the first heat exchange space 180. The outer tube 120 is sleeved over the inner tube 110, and the inner wall of the outer tube 120 and the outer wall of the inner tube 110 enclose a second heat exchange space 190. The outer tube 120 has a second liquid inlet 121 and a second liquid outlet 122, both of which are in communication with the second heat exchange space 190. Liquids of different temperatures are introduced into the first heat exchange space 180 and the second heat exchange space 190, respectively, to achieve heat exchange and meet the requirements of the heat exchange system 1000. By providing the first liquid inlet 111 and the first liquid outlet 112, the heat exchange medium in the first heat exchange space 180 can be circulated; by providing the second liquid inlet 121 and the second liquid outlet 122, the heat exchange medium in the second heat exchange space 190 can be circulated. In addition, by providing the tube wall of the inner tube 110 with a threaded shape, the surface tension of the inner tube 110 can be changed, the flow path of the fluid can be optimized, and bends and resistance can be reduced, allowing the fluid to flow more smoothly, thereby reducing pressure loss in the shell-and-tube heat exchanger 100, thereby effectively reducing pressure drop and improving the operating efficiency and performance of the heat exchange tube shell.

[0038] Commonly used double-tube heat exchangers 100 are mostly disc-shaped, which can easily cause refrigerant to accumulate in the double-tube heat exchanger 100, causing the heat exchange system 1000 to lack refrigerant and cause the heat exchange system 1000 to lose capacity. Figure 1 , and combined with Figure 4 To prevent refrigerant accumulation, the double-tube heat exchanger 100 in this embodiment includes a first pipe section 130, a first connecting pipe 140, and a second pipe section 150 connected in sequence, forming a U-shape. By designing the double-tube heat exchanger 100 in a U-shape and employing an inverted U-shape installation when connecting and installing the double-tube heat exchanger 100 to other structures in the heat exchange system 1000, refrigerant accumulation within the inner tube 110 and / or outer tube 120 of the double-tube heat exchanger 100 can be effectively prevented.

[0039] Please continue reading Figure 1 , and combined with Figure 4In this embodiment, the first pipe section 130 is provided with a first liquid inlet 111 and a second liquid outlet 122 at the end away from the first connecting pipe 140; the second pipe section 150 is provided with a first liquid outlet 112 and a second liquid inlet 121 at the end away from the first connecting pipe 140. Disposing the first liquid inlet 111, the second liquid inlet 121, and the first liquid outlet 112 and the second liquid outlet 122 at the lower end of the shell-and-tube heat exchanger 100 further prevents refrigerant from accumulating within the first heat exchange space 180 and the second heat exchange space 190 of the shell-and-tube heat exchanger 100. Furthermore, the liquid inlet and liquid outlet of the shell-and-tube heat exchanger 100 can be directly connected to the pipes. During installation, the distance between the connecting pipes is shortened, which reduces costs and simplifies the installation process. Of course, the first liquid inlet 111 and the second liquid outlet 122 can also be set at other positions of the first pipe section 130, and the first liquid outlet 112 and the second liquid inlet 121 can also be set at other positions of the second pipe section 150, depending on actual needs and are not limited here.

[0040] In order to facilitate the communication between the first liquid inlet 111 and the first liquid outlet 112 and an external device for providing heat exchange medium, please refer to Figure 1 , and combined with Figure 4 In this embodiment, a second connecting pipe 160 is provided at both the first liquid inlet 111 and the first liquid outlet 112. The second connecting pipe 160 is used to connect the inner tube 110 with the external pipe. Of course, the second liquid inlet 121 and the second liquid outlet 122 can also be provided with a second connecting pipe 160, which is not limited here.

[0041] In order to enhance the overall structural strength of the double-tube heat exchanger 100, please continue to refer to Figure 1 The shell and tube heat exchanger 100 in this embodiment further includes a reinforcing plate 170, one end of which is connected to the first pipe section 130, and the other end of the reinforcing plate 170 is connected to the second pipe section 150. Specifically, the number of reinforcing plates 170 in this embodiment is multiple, and the multiple reinforcing plates 170 are arranged at intervals along the axial direction of the first pipe section 130. The number of reinforcing plates 170 in this embodiment is two. Of course, three, four, five, or other multiple reinforcing plates 170 can also be provided according to actual conditions, and this is not limited here. In addition, other reinforcing structures can also be provided, and they do not necessarily have to be plate-shaped structures. Structures such as triangles are also acceptable, as long as they can strengthen the overall structural strength of the shell and tube heat exchanger 100. The specific design of the reinforcing structure is not limited here.

[0042] Figure 4 This is a schematic diagram of the heat exchange system 1000 provided in an embodiment of the present invention, please refer to Figure 4, this embodiment also provides a heat exchange system 1000, including the above-mentioned shell and tube heat exchanger 100, a water tank 200, a hot water pump 800, a compressor 300, a connecting valve 400 and a first heat exchanger 500, the connecting valve 400 includes a first valve port 410, a second valve port 420, a third valve port 430 and a fourth valve port 440; the outlet of the compressor 300 is connected to the second liquid inlet 121, the first liquid outlet 112 is connected to the water tank 200, the water tank 200 is connected to the first liquid inlet 111, and a hot water pump 800 is arranged between the water tank 200 and the first liquid inlet 111, the second liquid outlet 122 is connected to the first valve port 410, the second valve port 420 is connected to the first inlet of the first heat exchanger 500, the third valve port 430 is connected to the first outlet of the first heat exchanger 500, and the fourth valve port 440 is connected to the inlet of the compressor 300.

[0043] In order to prevent the heat exchanger from accumulating in the shell and tube heat exchanger 100 and thus affecting the overall heat exchange capacity of the heat exchange system 1000, the shell and tube heat exchanger 100 in this embodiment is U-shaped and installed in an "inverted U" shape.

[0044] Please continue reading Figure 4 The heat exchange system 1000 in this embodiment further includes a second heat exchanger 600 and an expansion valve 700. The second valve port 420 is connected to the inlet of the second heat exchanger 600, and the outlet of the second heat exchanger 600 is connected to the first inlet of the first heat exchanger 500. An expansion valve 700 is further disposed between the first inlet of the first heat exchanger 500 and the outlet of the second heat exchanger 600. In this embodiment, the second inlet of the first heat exchanger 500 is connected to the liquid outlet of the cooling and heating equipment, and the second outlet of the first heat exchanger 500 is connected to the liquid inlet of the cooling and heating equipment, thereby enabling heat exchange between the cooling and heating equipment and the first heat exchanger 500. The cooling and heating equipment in this embodiment is an air conditioner, but other equipment may also be used, and this is not limited here.

[0045] The refrigerant circulation process of the heat exchange system 1000 is as follows: the refrigerant is compressed by the compressor 300 to form a high-temperature and high-pressure refrigerant gas, which enters the second heat exchange space 190 of the shell and tube heat exchanger 100 from the second liquid inlet 121 for condensation; then enters the second heat exchanger 600 through the second valve port 420 of the connecting valve 400 to be condensed again to form a medium-temperature and high-pressure refrigerant liquid, and then flows into the expansion valve 700 for throttling and pressure reduction to form a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then enters the first heat exchanger 500 for evaporation to form a low-temperature and low-pressure refrigerant gas, and then flows into the compressor 300 from the first outlet of the first heat exchanger 500 through the third valve port 430.

[0046] Water in water tank 200 flows through first liquid inlet 111 of hot water pump 800 into first heat exchange space 180 of double-tube heat exchanger 100 for heat exchange, producing hot water. The hot water in first heat exchange space 180 of double-tube heat exchanger 100 exchanges heat with the refrigerant in second heat exchange space 190, completing the function of heat exchange system 1000.

[0047] Specifically, in this embodiment, the first heat exchanger 500 is a plate heat exchanger, the second heat exchanger 600 is a fin heat exchanger, and the expansion valve 700 is an electronic expansion valve. Electronic expansion valves offer advantages such as high accuracy, rapid operation, and environmental friendliness. They feature a wide adjustment range, rapid and sensitive operation, accurate adjustment, and stable and reliable performance. Of course, other heat exchangers can be used for the first and second heat exchangers 500 and 600, depending on actual heat exchange requirements and not specified herein. Other expansion valves, such as manual expansion valves, can also be used, and are not specified herein.

[0048] In summary, the shell-and-tube heat exchanger 100 includes an inner tube 110 and an outer tube 120. The inner tube 110 has a threaded wall, forming a first heat exchange space 180 within the inner tube 110. The inner tube 110 has a first liquid inlet 111 and a first liquid outlet 112, both of which are connected to the first heat exchange space 180. Liquids of different temperatures are introduced into the first heat exchange space 180 and the second heat exchange space 190, respectively, to achieve heat exchange, thereby meeting the requirements of the heat exchange system 1000. By configuring the inner tube 110 wall in a threaded shape, the surface tension of the inner tube 110 is modified, optimizing the fluid flow path, reducing bends and resistance, and enabling smoother fluid flow. This reduces pressure loss within the shell-and-tube heat exchanger 100, effectively reducing pressure drop and improving the operating efficiency and performance of the heat exchange shell.

[0049] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A double-tube heat exchanger, characterized in that: include: An inner tube (110), wherein the tube wall of the inner tube (110) is threaded, a first heat exchange space (180) is formed in the inner tube (110), and the inner tube (110) has a first liquid inlet (111) and a first liquid outlet (112), and both the first liquid inlet (111) and the first liquid outlet (112) are in communication with the first heat exchange space (180); An outer tube (120), the outer tube (120) being sleeved outside the inner tube (110), the inner wall of the outer tube (120) and the outer wall of the inner tube (110) enclosing a second heat exchange space (190); the outer tube (120) having a second liquid inlet (121) and a second liquid outlet (122), the second liquid inlet (121) and the second liquid outlet (122) both being in communication with the second heat exchange space (190).

2. The double-tube heat exchanger according to claim 1, characterized in that: The double-tube heat exchanger (100) comprises a first pipe section (130), a first connecting pipe (140), and a second pipe section (150) connected in sequence, and the double-tube heat exchanger (100) is U-shaped.

3. The double-tube heat exchanger according to claim 2, characterized in that: The first liquid inlet (111) and the second liquid outlet (122) are provided at one end of the first pipe section (130) away from the first connecting pipe (140); The first liquid outlet (112) and the second liquid inlet (121) are provided at one end of the second pipe section (150) away from the first connecting pipe (140).

4. The double-tube heat exchanger according to claim 3, characterized in that: A second connecting pipe (160) is provided at both the first liquid inlet (111) and the first liquid outlet (112), and the second connecting pipe (160) is used to connect the inner pipe (110) with an external pipe.

5. The double-tube heat exchanger according to claim 2, characterized in that: The shell and tube heat exchanger (100) further includes a reinforcing plate (170), one end of the reinforcing plate (170) is connected to the first pipe section (130), and the other end of the reinforcing plate (170) is connected to the second pipe section (150).

6. The double-tube heat exchanger according to claim 5, characterized in that: There are multiple reinforcing plates (170), and the multiple reinforcing plates (170) are arranged at intervals along the axial direction of the first pipe section (130).

7. A heat exchange system, characterized in that: The invention comprises the double-tube heat exchanger (100) according to any one of claims 1 to 6, a water tank (200), a hot water pump (800), a compressor (300), a connecting valve (400) and a first heat exchanger (500), wherein the connecting valve (400) comprises a first valve port (410), a second valve port (420), a third valve port (430) and a fourth valve port (440); The outlet of the compressor (300) is communicated with the second liquid inlet (121), the first liquid outlet (112) is communicated with the water tank (200), the water tank (200) is communicated with the first liquid inlet (111), and the hot water pump (800) is arranged between the water tank (200) and the first liquid inlet (111), the second liquid outlet (122) is communicated with the first valve port (410), the second valve port (420) is communicated with the first inlet of the first heat exchanger (500), the third valve port (430) is communicated with the first outlet of the first heat exchanger (500), and the fourth valve port (440) is communicated with the inlet of the compressor (300).

8. The heat exchange system according to claim 7, characterized in that: The shell and tube heat exchanger (100) is U-shaped, and the shell and tube heat exchanger (100) is installed in an "inverted U" shape.

9. The heat exchange system according to claim 7, characterized in that: The heat exchange system (1000) further comprises a second heat exchanger (600) and an expansion valve (700), wherein the second valve port (420) is connected to the inlet of the second heat exchanger (600), the outlet of the second heat exchanger (600) is connected to the first inlet of the first heat exchanger (500), and an expansion valve (700) is further provided between the first inlet of the first heat exchanger (500) and the outlet of the second heat exchanger (600).

10. The heat exchange system according to claim 9, characterized in that: The expansion valve (700) is an electronic expansion valve.

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