Heat exchanger for air source heat pump system and air source heat pump system

Abstract

The invention provides a heat exchanger for an air source heat pump system and the air source heat pump system. The heat exchange part comprises a second containing cavity and a first fluid heat exchange pipe, the first fluid heat exchange pipe is located in the first containing cavity, a phase change material is arranged in the second containing cavity, and the first fluid heat exchange pipe and the second containing cavity communicate with each other to be used for circulating first fluid; and the second fluid heat exchange pipe is arranged in the first containing cavity, and the second fluid heat exchange pipe is used for heating the third fluid and transferring heat to the first fluid in the first fluid heat exchange pipe through the third fluid, so that the heat is transferred into the phase change material of the second containing cavity. The heat exchanger continuously and stably heats the third fluid, meanwhile, redundant heat is transferred into the phase-change material to be stored, in the defrosting process, the second fluid heat exchange pipe stops heating, and the heat stored by the phase-change material is released in the first fluid heat exchange pipe to heat the third fluid through circular flowing of the first fluid.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchange equipment, and in particular to a heat exchanger for an air source heat pump system and an air source heat pump system. Background Art

[0002] Air source heat pump systems are widely used due to their flexible installation and compact structure. However, in complex usage environments, due to various reasons such as defrosting, the air source heat pump system will stop supplying heat for a certain period of time, causing the output temperature of the heated fluid in the heat exchanger in the system to not remain constant and unable to meet the user's heating needs. Summary of the invention

[0003] The embodiments of the present application provide a heat exchanger for an air source heat pump system and an air source heat pump system, aiming to solve the problem that the heat supply to the third fluid cannot be kept constant.

[0004] An embodiment of the first aspect of the present application provides a heat exchanger for an air source heat pump system, which is used to heat a third fluid, including: a cylinder, a heat exchange part, and a second fluid heat exchange tube, the cylinder including a first accommodating chamber and an inlet and an outlet connected to the first accommodating chamber; the heat exchange part including a second accommodating chamber and a first fluid heat exchange tube, the first fluid heat exchange tube is located in the first accommodating chamber, a phase change material is arranged in the second accommodating chamber, the first fluid heat exchange tube and the second accommodating chamber are connected to each other and are used to circulate the first fluid; the second fluid heat exchange tube is arranged in the first accommodating chamber, the second fluid heat exchange tube is used to heat the third fluid and transfer heat to the first fluid in the first fluid heat exchange tube through the third fluid.

[0005] In an embodiment of the present application, the two second accommodating chambers are located at both ends of the first accommodating chamber in the first direction, there are more than two first fluid heat exchange tubes, and each first fluid heat exchange tube is located in the first accommodating chamber and connected between the two second accommodating chambers.

[0006] In an embodiment of the present application, a central tube extending along a first direction is provided in the first accommodating chamber, the central tube is used to accommodate the phase change material, and the central tube is located in the first accommodating chamber and communicates with the two second accommodating chambers.

[0007] In an embodiment of the present application, a circulation pump is provided in one of the second accommodating chambers, and the circulation pump is used to circulate the first fluid through the first fluid heat exchange tube and the second accommodating chamber to form a circulation loop.

[0008] In an embodiment of the present application, the second fluid heat exchange tube includes a plurality of second fluid heat exchange tubes, and at least a portion of the second fluid heat exchange tubes are wound around the outer circumference of the first fluid heat exchange tube.

[0009] In an embodiment of the present application, the first fluid heat exchange tube is used for circulating the first fluid, and the second fluid heat exchange tube is used for circulating the second fluid, and the flow directions of the first fluid and the second fluid are opposite.

[0010] A second aspect of the present application provides an air source heat pump system, comprising the heat exchanger in any one of the embodiments of the first aspect.

[0011] In an embodiment of the present application, the air source heat pump system also includes an air-cooled evaporator, a compressor and a throttling device. The air-cooled evaporator is connected to the compressor and is used to circulate the second fluid; the air-cooled evaporator is used to heat the second fluid, and the compressor is used to compress the second fluid; the compressor is connected to one end of the second fluid heat exchange tube, and the air-cooled evaporator is connected to the other end of the second fluid heat exchange tube, and the throttling device is arranged between the other end of the second fluid heat exchange tube and the air-cooled evaporator.

[0012] In an embodiment of the present application, a first tee is arranged between the compressor and one end of the second fluid heat exchange tube, and a second tee is arranged between the air-cooled evaporator and the throttling device; the first end of the first tee is connected to the compressor, the second end of the first tee is connected to one end of the second fluid heat exchange tube, the third end of the first tee is connected to the first end of the second tee, the second end of the second tee is connected to the air-cooled evaporator, and the third end of the second tee is connected to the throttling device.

[0013] In an embodiment of the present application, a defrost solenoid valve is provided between the third end of the first three-way connection and the first end of the second three-way connection.

[0014] In an embodiment of the present application, a heat exchanger is used to heat a third fluid, and the third fluid is disposed in a first accommodating chamber. A second fluid heat exchange tube is disposed in the first accommodating chamber, and the second fluid heat exchange tube is used to provide heat. The third fluid enters the first accommodating chamber from the inlet, absorbs the heat of the second fluid heat exchange tube, and is then discharged from the outlet. After the second fluid heat exchange tube heats the third fluid, the third fluid transfers heat to the first fluid in the first fluid heat exchange tube in the first accommodating chamber. The first fluid circulates in the second accommodating chamber and the first fluid heat exchange tube, and transfers heat to the phase change material. The phase change material system stores heat from the first fluid. When the second fluid heat exchange tube stops heating, the phase change material undergoes a phase change and releases heat to the first fluid. After the first fluid flows to the first fluid heat exchange tube, it releases heat to the first accommodating chamber to heat the third fluid, thereby achieving a constant temperature of the third fluid in the first accommodating chamber.

[0015] The heat exchanger used in the air source heat pump system in this embodiment can realize continuous and stable heating of the third fluid, and at the same time can transfer excess heat to the phase change material to realize heat storage. During the defrosting process, when the second fluid heat exchange tube stops heating, the phase change material undergoes a phase change and releases the stored heat through the first fluid in the first fluid heat exchange tube to heat the third fluid, thereby preventing the temperature of the third fluid from dropping significantly and alleviating the problem that the heat supply to the third fluid cannot be kept constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0017] Figure 1 is a structural schematic diagram of a heat exchanger for an air source heat pump system provided in an embodiment of the present application;

[0018] Figure 2 is a cross-sectional view of a heat exchanger for an air source heat pump system provided in an embodiment of the present application;

[0019] Figure 3 It is a structural schematic diagram of an air source heat pump system provided in an embodiment of the present application.

[0020] Explanation of the reference numerals: 10, heat exchanger; 20, air-cooled evaporator; 30, compressor; 40, first three-way valve; 50, second three-way valve; 60, defrost solenoid valve; 70, throttling device; 100, cylinder; 110, first accommodating chamber; 120, inlet; 130, outlet; 140, first air collecting pipe; 150, second air collecting pipe; 200, heat exchange part; 210, second accommodating chamber; 220, first fluid heat exchange tube; 230, phase change material; 240, central tube; 250, circulation pump; 300, second fluid heat exchange tube. DETAILED DESCRIPTION

[0021] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0022] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0024] In order to better understand this application, Figures 1 to 3 The heat exchanger and air source heat pump system of the embodiments of the present application are described in detail.

[0025] like Figure 1 As shown, a heat exchanger 10 for an air source heat pump system provided by an embodiment of the first aspect of the present application is used to heat a third fluid. The heat exchanger 10 includes a cylinder 100, a heat exchange part 200 and a second fluid heat exchange tube 300; the cylinder 100 includes a first accommodating chamber 110 and an inlet 120 and an outlet 130 connected to the first accommodating chamber 110; the heat exchange part 200 includes a second accommodating chamber 210 and a first fluid heat exchange tube 220, the first fluid heat exchange tube 220 is located in the first accommodating chamber 110, a phase change material 230 is arranged in the second accommodating chamber 210, the first fluid heat exchange tube 220 and the second accommodating chamber 210 are connected to each other and are used to circulate the first fluid; the second fluid heat exchange tube 300 is arranged in the first accommodating chamber 110, the second fluid heat exchange tube 300 is used to heat the third fluid and transfer heat to the first fluid in the first fluid heat exchange tube 220 through the third fluid.

[0026] In this embodiment, the heat exchanger 10 is used to heat the third fluid, the third fluid is arranged in the first accommodating chamber 110, the first accommodating chamber 110 is provided with a second fluid heat exchange tube 300, the second fluid heat exchange tube 300 is used to provide heat, the third fluid enters the first accommodating chamber 110 from the inlet 120, absorbs the heat of the second fluid heat exchange tube 300, and then is discharged from the outlet 130. After the second fluid heat exchange tube 300 heats the third fluid, the third fluid transfers the heat to the first fluid in the first fluid heat exchange tube 220 in the first accommodating chamber 110, the first fluid circulates in the second accommodating chamber 210 and the first fluid heat exchange tube 220, transfers the heat to the phase change material 230, and the phase change material 230 absorbs the heat of the first fluid to realize heat storage. When the second fluid heat exchange tube 300 stops heating, the phase change material 230 undergoes a phase change to release heat and transfer it to the first fluid. After the first fluid flows to the first fluid heat exchange tube 220, the heat is released into the first accommodating chamber 110 to heat the third fluid, thereby achieving a constant temperature of the third fluid in the first accommodating chamber 110.

[0027] The heat exchanger 10 in this embodiment can realize continuous and stable heating of the third fluid, and at the same time can transfer excess heat to the phase change material 230 to realize heat storage. During the defrosting process of the heating system, the heating system can be an air source heat pump system. When the second fluid heat exchange tube 300 stops heating, the phase change material 230 undergoes a phase change and releases the stored heat through the first fluid circulation to the first fluid heat exchange tube 220 to heat the third fluid, thereby preventing the temperature of the third fluid from dropping significantly and alleviating the problem that the heating of the third fluid cannot be kept constant.

[0028] Optionally, the phase change material 230 may include paraffin, which can store and release energy through the phase change of the material. Among them, paraffin has the advantages of high storage density, stability, safety, environmental protection, etc. The application principle of paraffin is to use it in a solid state at room temperature. When the temperature rises to a certain level, it will change phase while maintaining the solid state, and store the absorbed heat. On the contrary, when the temperature drops, the paraffin will release the previously stored heat. This phase change process is a reversible process, so it can be continuously recycled.

[0029] Optionally, the first fluid may be liquid or gas, which is conducive to circulation in the second accommodating chamber 210 and the first fluid heat exchange tube 220, and the first fluid may include water.

[0030] like Figure 1 As shown, in some optional embodiments, the two second accommodating chambers 210 are located at both ends of the first accommodating chamber 110 in the first direction, there are more than two first fluid heat exchange tubes 220, and each first fluid heat exchange tube 220 is located in the first accommodating chamber 110 and connected between the two second accommodating chambers 210.

[0031] In these optional embodiments, more than two first fluid heat exchange tubes 220 are connected to two second accommodating chambers 210, so that the first fluid can circulate in the two second accommodating chambers 210 and through more than two first fluid heat exchange tubes 220. During the heating process of the second fluid heat exchange tube 300, the circulating first fluid absorbs heat in the first fluid heat exchange tube 220 and enters the two second accommodating chambers 210 to transfer the heat to the phase change material 230. During the process of stopping the heating of the second fluid heat exchange tube 300, the circulating first fluid absorbs the heat released by the phase change material 230 in the second accommodating chamber 210 and circulates to the first fluid heat exchange tube 220 to release the heat to the first accommodating chamber 110 to heat the third fluid. The provision of multiple second accommodating chambers 210 helps to increase the volume of the phase change material 230, which is conducive to increasing the heat storage capacity of the phase change material 230. At the same time, the provision of multiple first fluid heat exchange tubes 220 increases the contact area between the first fluid and the third fluid, which is conducive to improving the efficiency of absorbing and releasing heat.

[0032] like Figure 1 and Figure 2 As shown, in some optional embodiments, a central tube 240 extending along a first direction is provided in the first accommodating chamber 110 . The central tube 240 is used to accommodate the phase change material 230 . The central tube 240 is located in the first accommodating chamber 110 and connects the two second accommodating chambers 210 .

[0033] In these optional embodiments, the central tube 240 is disposed in the first accommodating chamber 110, and there is extra space in the first accommodating chamber 110. Arranging the central tube 240 in the first accommodating chamber 110 is beneficial to increase the storage volume of the phase change material 230. In addition, the central tube 240 can connect the two second accommodating chambers 210, thereby increasing the circulation channels of the two second accommodating chambers 210, which is beneficial to enhance the circulation rate of the first fluid.

[0034] like Figure 1As shown, in some optional embodiments, a circulation pump 250 is provided in one of the second accommodating chambers 210, and the circulation pump 250 is used to form a circulation loop between the first fluid heat exchange tube 220 and the second accommodating chamber 210. In these optional embodiments, the circulation pump 250 is used to promote the circulation of the first fluid in the second accommodating chamber 210 and the first fluid heat exchange tube 220, and enhance the efficiency of the first fluid in transferring heat. Optionally, the circulation pump 250 is located in the second accommodating chamber 210 and is arranged opposite to the central tube 240. The pressure direction of the circulation pump 250 is toward the central tube 240. The circulation pump 250 presses the first fluid in the second accommodating chamber 210 toward the central tube 240, and the first fluid enters another second accommodating chamber 210 through the central tube 240, that is, from the second accommodating chamber 210 on one side in the first direction to the second accommodating chamber 210 on the other side. After the first fluid enters the second accommodating chamber 210 on the other side, it passes through the first fluid heat exchange tube 220 and the first accommodating chamber 110 and then returns to the second accommodating chamber 210 on the one side in the above-mentioned first direction to form a cycle.

[0035] like Figure 1 and Figure 2 As shown, in some optional embodiments, the second fluid heat exchange tube 300 includes a plurality of second fluid heat exchange tubes 300 , and at least a portion of the second fluid heat exchange tubes 300 are wound around the outer circumference of the first fluid heat exchange tube 220 .

[0036] In these optional embodiments, the second fluid heat exchange tube 300 is disposed in the first accommodating chamber 110, and the second fluid heat exchange tube 300 is wound around the outer periphery of the first fluid heat exchange tube 220 to increase the ambient temperature around the first fluid heat exchange tube 220, which can help increase the heat absorbed by the first fluid in the first fluid heat exchange tube 220. In addition, the second fluid heat exchange tube 300 is wound around the first fluid heat exchange tube 220, and the length of the second fluid heat exchange tube 300 corresponding to the first fluid heat exchange tube 220 per unit length is longer, further improving the heat absorption efficiency of the first fluid in the first fluid heat exchange tube 220, and at the same time, the length of the second fluid heat exchange tube 300 in the first accommodating chamber 110 increases the contact area with the third fluid, thereby increasing the heating area of ​​the third fluid.

[0037] like Figure 1 As shown, in some optional embodiments, a first air collecting pipe 140 and a second air collecting pipe 150 are provided in the first accommodating cavity 110, and the first air collecting pipe 140 and the second air collecting pipe 150 are respectively provided on both sides of the first accommodating cavity 110 in the first direction, wherein the first air collecting pipe 140 is connected to the inlets of the plurality of second fluid heat exchange tubes 300, and the second air collecting pipe 150 is connected to the outlets of the plurality of second fluid heat exchange tubes 300.

[0038] In these optional embodiments, the second fluid may be a gas, and the second fluid enters the second fluid heat exchange tube 300 through the inlet of the second fluid heat exchange tube 300 from the first gas header 140, and enters the second gas header 150 through the outlet of the second fluid heat exchange tube 300 and is discharged from the heat exchanger 10. The first gas header 140 and the second gas header 150 are used to connect the plurality of second fluid heat exchange tubes 300, so that the second fluid in each second fluid heat exchange tube 300 has the same mass.

[0039] like Figure 1 As shown, in some optional embodiments, the first fluid heat exchange tube 220 is used to circulate the first fluid, and the second fluid heat exchange tube 300 is used to circulate the second fluid, and the flow directions of the first fluid and the second fluid are opposite.

[0040] In these optional embodiments, during the process of the second fluid heat exchange tube 300 heating the third fluid in the first accommodating chamber 110, since the third fluid absorbs the heat of the second fluid in the second fluid heat exchange tube 300, the temperature of the second fluid gradually decreases in the flow direction of the second fluid.

[0041] After the first fluid absorbs heat from the phase change material 230 in the second accommodating chamber 210, it enters the first fluid heat exchange tube 220 at a low temperature. The first fluid absorbs the temperature of the third fluid through the first fluid heat exchange tube 220, so the temperature of the first fluid gradually increases in the flow direction of the first fluid in the first fluid heat exchange tube 220.

[0042] Since the temperature of the second fluid gradually decreases in the flow direction, the temperature of the corresponding third fluid also gradually decreases in the flow direction of the second fluid. In this embodiment, the flow directions of the first fluid and the second fluid are set opposite, so that the part of the second fluid heat exchange tube 300 with a lower temperature corresponds to the part of the first fluid heat exchange tube 220 with a lower temperature, and the part of the second fluid heat exchange tube 300 with a higher temperature corresponds to the part of the first fluid heat exchange tube 220 with a higher temperature, so as to improve the heat storage efficiency.

[0043] It should be noted that the flow direction may be a flow trend, for example, the overall flow direction of the second fluid is to flow toward the first direction, and the overall flow direction of the first fluid is to flow in the reverse direction of the first direction.

[0044] like Figure 3 As shown, the second aspect of the present application proposes an air source heat pump system, comprising the heat exchanger 10 in any one of the embodiments of the first aspect.

[0045] The air source heat pump system heats the third fluid through the heat exchanger 10. The third fluid can be water or oil, etc. The third fluid is arranged in the first accommodating chamber 110. The first accommodating chamber 110 is provided with a second fluid heat exchange tube 300. The second fluid heat exchange tube 300 is used to provide heat. The third fluid enters the first accommodating chamber 110 from the inlet 120, absorbs the heat of the second fluid heat exchange tube 300, and is discharged from the outlet 130. The third fluid passes through the heat exchanger 10 to obtain a certain amount of heat to increase the temperature.

[0046] After the second fluid heat exchange tube 300 heats the third fluid, the third fluid transfers heat to the first fluid in the first fluid heat exchange tube 220 in the first accommodating chamber 110. The first fluid circulates in the second accommodating chamber 210 and the first fluid heat exchange tube 220, and transfers heat to the phase change material 230. The phase change material 230 absorbs the heat of the first fluid to achieve heat storage. When the second fluid heat exchange tube 300 stops heating, the phase change material 230 undergoes a phase change and releases heat to transfer to the first fluid. After the first fluid flows to the first fluid heat exchange tube 220, it releases heat to the first accommodating chamber 110 to heat the third fluid, thereby achieving a constant temperature of the third fluid in the first accommodating chamber 110.

[0047] The heat exchanger 10 in this embodiment can achieve continuous and stable heating of the third fluid, and at the same time can transfer excess heat to the phase change material 230 to achieve heat storage. When the second fluid heat exchange tube 300 fails, is under maintenance or is in the defrosting process, the second fluid heat exchange tube 300 stops heating, and the phase change material 230 undergoes a phase change to release the stored heat to heat the third fluid, thereby preventing a significant drop in the temperature of the third fluid.

[0048] like Figure 1 and Figure 3 As shown, in some optional embodiments, the air source heat pump system also includes an air-cooled evaporator 20, a compressor 30 and a throttling device 70. The air-cooled evaporator 20 is connected to the compressor 30 and is used to circulate the second fluid; the air-cooled evaporator 20 is used to heat the second fluid, and the compressor 30 is used to compress the second fluid; the compressor 30 is connected to one end of the second fluid heat exchange tube 300, and the air-cooled evaporator 20 is connected to the other end of the second fluid heat exchange tube 300, and the throttling device 70 is arranged between the other end of the second fluid heat exchange tube 300 and the air-cooled evaporator 20.

[0049] In these optional embodiments, the air-cooled evaporator 20 is connected to one end of the second fluid heat exchange tube 300, the compressor 30 is connected to the other end of the second fluid heat exchange tube 300, and the throttling device 70 is disposed between the other end of the second fluid heat exchange tube 300 and the air-cooled evaporator 20. The second fluid passes through the air-cooled evaporator 20, the compressor 30, the second fluid heat exchange tube 300, the throttling device 70 in sequence, and finally returns to the air-cooled evaporator 20. Specifically, the second fluid is changed to a high-temperature and high-pressure state after the compressor 30 does work, enters the second fluid heat exchange tube 300 of the heat exchanger 10 to exchange heat with the third fluid, is cooled in the second fluid heat exchange tube 300, enters the throttling device 70 to be throttled to a low-temperature and low-pressure second fluid, and finally enters the air-cooled evaporator 20, absorbs heat from the air, becomes a saturated or superheated gas, and then does work in the compressor 30 to become a high-temperature and high-pressure state, and so on. The cycle provides continuous heat for the third fluid. Optionally, the air-cooled evaporator 20 is connected to the second air collecting pipe 150 through a throttling device 70, and the compressor 30 is connected to the first air collecting pipe 140. Optionally, the throttling device 70 may be an expansion valve.

[0050] like Figure 3 As shown, in some optional embodiments, a first tee 40 is arranged between the compressor 30 and one end of the second fluid heat exchange tube 300, and a second tee 50 is arranged between the air-cooled evaporator 20 and the throttling device 70; the first end of the first tee 40 is connected to the compressor 30, the second end of the first tee 40 is connected to one end of the second fluid heat exchange tube 300, the third end of the first tee 40 is connected to the first end of the second tee 50, the second end of the second tee 50 is connected to the air-cooled evaporator 20, and the third end of the second tee 50 is connected to the throttling device 70.

[0051] In these optional embodiments, a first tee 40 is provided between the compressor 30 and one end of the second fluid heat exchange tube 300, a second tee 50 is provided between the air-cooled evaporator 20 and the throttling device, and the third end of the first tee 40 is connected to the first end of the second tee 50 so that the air-cooled evaporator 20 and the compressor 30 form a circulation loop. When the air source heat pump system is working in a low temperature and high humidity environment, the evaporator frosts, resulting in a decrease in heating capacity and system energy efficiency ratio. In severe cases, it will cause the system to shut down. In order to ensure the continuous and normal operation of the unit, the evaporator needs to be periodically defrosted. The air-cooled evaporator 20 and the compressor 30 form a circulation loop so that at least part of the second fluid is heated and then circulated back to the air-cooled evaporator 20 by the compressor 30 through the first tee 40 for heating and defrosting. During the heating and defrosting stage, since at least part of the second fluid circulates back to the air-cooled evaporator 20 through the first three-way valve 40, the temperature of the second fluid heat exchange tube 300 in the heat exchanger 10 is reduced. In order to ensure that the third fluid in the heat exchanger 10 has a constant temperature for heating, the first fluid absorbs the heat released by the phase change material 230 in the second accommodating chamber 210 and circulates to the first fluid heat exchange tube 220 to release the heat to the first accommodating chamber 110 to heat the third fluid, thereby ensuring constant heat supply to the third fluid.

[0052] like Figure 3 As shown, in some optional embodiments, a defrost solenoid valve 60 is provided between the third end of the first tee 40 and the first end of the second tee 50 .

[0053] In these optional embodiments, the defrost solenoid valve 60 is disposed between the third end of the first three-way connection 40 and the first end of the second three-way connection 50. When the defrost solenoid valve 60 is opened, at least part of the second fluid is heated and then circulated back to the air-cooled evaporator 20 by the compressor 30 through the first three-way connection 40 for heating and defrosting. When the defrost solenoid valve 60 is closed, the second fluid can be prevented from entering the pipeline between the third end of the first three-way connection 40 and the first end of the second three-way connection 50 to cause heat waste, thereby improving thermal efficiency.

[0054] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A heat exchanger for an air source heat pump system, used for heating a third fluid, characterized in that: include: A cylinder body, comprising a first accommodating chamber and an inlet and an outlet communicating with the first accommodating chamber; A heat exchange part, the heat exchange part comprising a second accommodating chamber and a first fluid heat exchange tube, the first fluid heat exchange tube is located in the first accommodating chamber, a phase change material is arranged in the second accommodating chamber, the first fluid heat exchange tube and the second accommodating chamber are interconnected and used for circulating the first fluid; The second fluid heat exchange tube is disposed in the first accommodating chamber, and is used for heating the third fluid and transferring heat to the first fluid in the first fluid heat exchange tube through the third fluid.

2. The heat exchanger according to claim 1, characterized in that: The two second accommodating chambers are located at two ends of the first accommodating chamber in the first direction. There are more than two first fluid heat exchange tubes. Each of the first fluid heat exchange tubes is located in the first accommodating chamber and is connected between the two second accommodating chambers.

3. The heat exchanger according to claim 2, characterized in that: A central tube extending along the first direction is disposed in the first accommodating chamber, and the central tube is used to accommodate the phase change material. The central tube is located in the first accommodating chamber and communicates with the two second accommodating chambers.

4. The heat exchanger according to claim 2, characterized in that: A circulation pump is provided in one of the second accommodating chambers, and the circulation pump is used to circulate the first fluid through the first fluid heat exchange tube and the second accommodating chamber to form a circulation loop.

5. The heat exchanger according to claim 1, characterized in that: The second fluid heat exchange tube includes a plurality of tubes, and at least part of the second fluid heat exchange tubes is wound around the outer circumference of the first fluid heat exchange tube.

6. The heat exchanger according to claim 5, characterized in that The first fluid heat exchange tube is used for circulating the first fluid, and the second fluid heat exchange tube is used for circulating the second fluid. The flow directions of the first fluid and the second fluid are opposite.

7. An air source heat pump system, characterized in that: A heat exchanger comprising any one of claims 1-6.

8. The air source heat pump system according to claim 7, characterized in that: The air source heat pump system further comprises an air-cooled evaporator, a compressor and a throttling device, wherein the air-cooled evaporator is connected to the compressor and is used for circulating the second fluid; The air-cooled evaporator is used to heat the second fluid, and the compressor is used to compress the second fluid; The compressor is connected to one end of the second fluid heat exchange tube, the air-cooled evaporator is connected to the other end of the second fluid heat exchange tube, and the throttling device is arranged between the other end of the second fluid heat exchange tube and the air-cooled evaporator.

9. The air source heat pump system according to claim 8, characterized in that: A first tee is provided between the compressor and one end of the second fluid heat exchange tube, and a second tee is provided between the air-cooled evaporator and the throttling device; The first end of the first tee is connected to the compressor, the second end of the first tee is connected to one end of the second fluid heat exchange tube, the third end of the first tee is connected to the first end of the second tee, the second end of the second tee is connected to the air-cooled evaporator, and the third end of the second tee is connected to the throttling device.

10. The air source heat pump system according to claim 9, characterized in that: A defrost solenoid valve is provided between the third end of the first three-way connection and the first end of the second three-way connection.

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