Heat pump system

Abstract

The invention discloses a heat pump system which comprises a compressor, a heating heat exchanger and a refrigerating heat exchanger, the compressor, the heating heat exchanger and the refrigerating heat exchanger are connected in series, the heating heat exchanger is connected with a heating working medium pump and a heating buffer water tank, and the refrigerating heat exchanger is connected with a refrigerating working medium pump and a refrigerating buffer water tank. And the heating buffer water tank and the hot and cold buffer water tank are simultaneously connected with the air disc application assembly. And a four-way valve structure is cancelled, and during mode switching, through component control of a working medium side and continuous operation of a refrigerant side, the structure of the refrigerant side is simplified, the operation reliability of a host is improved, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of air-conditioning equipment, and in particular to a heat pump system. Background Art

[0002] Air source heat pumps have the characteristics of energy saving and comfort, and have a variety of applications in air conditioning equipment. However, with the development of technology, the comprehensive application of air source heat pumps needs to be further improved.

[0003] In the process of realizing the present invention, the inventors found that the prior art has at least the following problems: the existing heat pump system switches between cooling and heating through a four-way valve, and in the refrigerant-water heat exchanger, the refrigerant usually flows in reverse when dissipating heat to water, and flows in parallel when absorbing heat from water, resulting in reduced plate exchange efficiency during heat absorption, and at the same time, the waste heat cannot be fully utilized, resulting in energy waste.

[0004] Therefore, how to provide a heat pump system with a simplified refrigerant side structure is a technical problem that those skilled in the art currently need to solve. Summary of the invention

[0005] The object of the present invention is to provide a heat pump system to solve the technical problem of complex structure on the refrigerant side.

[0006] In order to solve the above technical problems, the present invention provides a heat pump system, including a compressor, a heat exchanger, a heating heat exchanger and a cooling heat exchanger. The compressor, the heating heat exchanger and the cooling heat exchanger are connected in series, the heating heat exchanger is connected to a heating working fluid pump, the cooling heat exchanger is connected to a cooling working fluid pump, and the heating working fluid pump and the cooling working fluid pump are also connected to a fan application component at the same time.

[0007] Preferably, it also includes a heat exchanger, a working fluid pump and a hot water tank, the compressor, the heat exchanger, the heating heat exchanger and the cooling heat exchanger are connected in series, and the heat exchanger is connected to the working fluid pump and the hot water tank.

[0008] Preferably, the heating heat exchanger and the heating working fluid pump are connected to the fan disk application component via a heating buffer water tank, and the cooling heat exchanger and the cooling working fluid pump are connected to the fan disk application component via a cooling buffer water tank.

[0009] Preferably, the air disk application component includes a first air disk and four switch control valves, a single heat exchange end is arranged in the first air disk, the four switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank and the cooling buffer water tank, and the two switch control valves connected to the water tank outlet are simultaneously connected to the inlet of the single heat exchange end, and the two switch control valves connected to the water tank inlet are simultaneously connected to the outlet of the single heat exchange end.

[0010] Preferably, the air disk application component includes a second air disk and four switch control valves, and a heating heat exchange end and a cooling heat exchange end are arranged in the second air disk. The four switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank and the cooling buffer water tank, and are correspondingly connected to the inlet and outlet of the heating heat exchange end and the cooling heat exchange end.

[0011] Preferably, the air disk application component includes a third air disk and seven switch control valves, a front heat exchange end and a rear heat exchange end are arranged in the third air disk, the first switch control valve connects the outlet of the heating buffer water tank and the inlet of the front heat exchange end, the second switch control valve connects the inlet of the heating buffer water tank and the outlet of the front heat exchange end, the third switch control valve connects the inlet of the heating buffer water tank and the outlet of the rear heat exchange end, the fourth switch control valve connects the outlet of the cooling buffer water tank and the inlet of the front heat exchange end, the fifth switch control valve connects the outlet of the cooling buffer water tank and the inlet of the rear heat exchange end, the sixth switch control valve connects the inlet of the cooling buffer water tank and the outlet of the rear heat exchange end, and the seventh switch control valve connects the outlet of the front heat exchange end and the inlet of the rear heat exchange end.

[0012] Preferably, it comprises a floor heating pipeline and two switch control valves, wherein the two switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank, and are correspondingly connected to the inlet and outlet of the floor heating pipeline.

[0013] Preferably, it includes a system heat exchanger and four switch control valves, the four switch control valves are respectively connected to the inlet and outlet of the heating heat exchanger and the cooling heat exchanger, and the two switch control valves connected to the outlets of the heating heat exchanger and the cooling heat exchanger are simultaneously connected to the inlet of the system heat exchanger, and the two switch control valves connected to the inlet of the heating heat exchanger and the cooling heat exchanger are simultaneously connected to the outlet of the system heat exchanger.

[0014] Preferably, the flow direction of the refrigerant delivered by the compressor in the heat exchanger is opposite to the flow direction of the working fluid delivered by the working fluid pump in the heat exchanger, the flow direction of the refrigerant delivered by the compressor in the heating heat exchanger is opposite to the flow direction of the working fluid delivered by the heating working fluid pump in the heating heat exchanger, and the flow direction of the refrigerant delivered by the compressor in the refrigeration heat exchanger is opposite to the flow direction of the working fluid delivered by the refrigeration working fluid pump in the refrigeration heat exchanger.

[0015] Preferably, a first auxiliary pump is provided at the inlet of the heating buffer water tank, and a second auxiliary pump is provided at the inlet of the cooling buffer water tank.

[0016] Preferably, a first throttle is provided on the refrigerant pipeline between the heating heat exchanger and the cooling heat exchanger, and a second throttle and an injection enthalpy increase heat exchanger are provided between the compressor and the first throttle.

[0017] The present invention provides a heat pump system, comprising a compressor, a heating heat exchanger and a cooling heat exchanger. The compressor, the heating heat exchanger and the cooling heat exchanger are connected in series. The heating heat exchanger is connected to a heating working fluid pump and a heating buffer water tank. The cooling heat exchanger is connected to a cooling working fluid pump and a cooling buffer water tank. The heating buffer water tank and the hot-cold buffer water tank are also connected to a fan application component at the same time.

[0018] It has multiple working modes, eliminates the four-way valve structure, and adopts a series structure for each component. There is no need for frequent switching of the four-way valve. When the mode is switched, the refrigerant side is controlled by the components on the working fluid side, while the refrigerant side continues to operate, thereby simplifying the refrigerant side structure and changing the auxiliary cross circuit into a simple series circuit, thus avoiding equipment problems caused by four-way valve failure, increasing the reliability of the main engine operation, and improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of Embodiment 1 of the heat pump system provided by the present invention;

[0020] Figure 2 This is a structural schematic diagram of a second embodiment of the heat pump system provided by the present invention;

[0021] Figure 3 This is a schematic structural diagram of Embodiment 3 of the heat pump system provided by the present invention;

[0022] Figure 4 This is a structural schematic diagram of Embodiment 4 of the heat pump system provided by the present invention.

[0023] Among them, compressor 1, heat exchanger 2, heating heat exchanger 3, cooling heat exchanger 4, working fluid pump 5, hot water tank 6, heating working fluid pump 7, heating buffer water tank 8, cooling working fluid pump 9, cooling buffer water tank 10, first air disc 11, second air disc 12, third air disc 13, floor heating pipeline 14, system heat exchanger 15, first throttle 16, first auxiliary pump 17, second auxiliary pump 18, second throttle 19, jet enthalpy increase heat exchanger 20. DETAILED DESCRIPTION

[0024] The core of the present invention is to provide a heat pump system to solve the technical problem of complex structure on the refrigerant side.

[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of Embodiment 1 of the heat pump system provided by the present invention.

[0027] A specific embodiment of the present invention provides a heat pump system, including a compressor 1, a heating heat exchanger 3 and a cooling heat exchanger 4, each heat exchanger is provided with a refrigerant inlet, a refrigerant outlet, a working fluid inlet and a working fluid outlet, and the refrigerant side of each heat exchanger is connected in series. In the first embodiment, the outlet of the compressor 1 is connected to the refrigerant inlet of the heating heat exchanger 3, the refrigerant outlet of the heating heat exchanger 3 is connected to the refrigerant inlet of the cooling heat exchanger 4, and the refrigerant outlet of the cooling heat exchanger 4 is connected to the inlet of the compressor 1, forming a refrigerant side loop, and the refrigerant flows in the above loop. Furthermore, the heating heat exchanger 3 is connected to a heating working fluid pump 7, and the cooling heat exchanger 4 is connected to a cooling working fluid pump 9, and the heating working fluid pump 7 and the cooling working fluid pump 9 are also connected to the fan application component at the same time.

[0028] In order to realize waste heat recovery, a heat exchanger 2, a working fluid pump 5 and a hot water tank 6 are also provided. The heat exchanger 2 is connected in series with the compressor 1, the heating heat exchanger 3 and the cooling heat exchanger 4. The heat exchanger 2 is connected with the working fluid pump 5 and the hot water tank 6. The outlet of the compressor 1 is connected to the refrigerant inlet of the heat exchanger 2, the refrigerant outlet of the heat exchanger 2 is connected to the refrigerant inlet of the heating heat exchanger 3, the refrigerant outlet of the heating heat exchanger 3 is connected to the refrigerant inlet of the cooling heat exchanger 4, and the refrigerant outlet of the cooling heat exchanger 4 is connected to the inlet of the compressor 1, forming a refrigerant side loop, and the refrigerant flows in the above loop. The working fluid outlet of the heat exchanger 2 is connected to the inlet of the coil in the hot water tank 6, and the outlet of the coil in the hot water tank 6 is connected to the inlet of the heat exchanger 2 through the working fluid pump 5.

[0029] In order to improve the stability of the system, a buffer water tank is also provided. The heating heat exchanger 3 and the heating working fluid pump 7 are connected to the fan disk application component through the heating buffer water tank 8, and the cooling heat exchanger 4 and the cooling working fluid pump 9 are connected to the fan disk application component through the cooling buffer water tank 10. Specifically, the working fluid outlet of the heating heat exchanger 3 is connected to the inlet of one side of the heating buffer water tank 8, and the outlet of one side of the heating buffer water tank 8 is connected to the working fluid inlet of the heating heat exchanger 3 through the heating working fluid pump 7, and the inlet and outlet of the other side of the heating buffer water tank 8 are connected to the fan disk application component. Similarly, the working fluid outlet of the cooling heat exchanger 4 is connected to the inlet of one side of the cooling buffer water tank 10, and the outlet of one side of the cooling buffer water tank 10 is connected to the working fluid inlet of the cooling heat exchanger 4 through the cooling working fluid pump 9, and the inlet and outlet of the other side of the cooling buffer water tank 10 are connected to the fan disk application component. Among them, due to the possibility of encountering extreme loads, such as high-temperature cooling, the compressor exhaust temperature is very high, and the working fluid faces extremely high application temperature. Or low-temperature heating, the working fluid faces extremely low application temperature. Therefore, in addition to the need to control the operating temperature on the refrigerant side, the working fluid also needs to use a liquid with a high boiling point and a low freezing point. The working fluid can be considered to be an ethylene glycol aqueous solution, and the concentration needs to be controlled during use. The boiling point of the solution is recommended to be higher than the exhaust protection temperature, and the freezing point must be lower than the refrigerant saturation temperature under the compressor suction pressure during the worst low-temperature operation. The connection method of each inlet and outlet can also be adjusted according to the situation, and sensors, filters, expansion valves and other devices can be provided, all of which are within the scope of protection of the present invention.

[0030] During operation, the compressor 1 is continuously started, and the refrigerant passes through the heat exchanger 2, the heating heat exchanger 3 and the cooling heat exchanger 4 in sequence. When hot water is needed, the working fluid pump 5 drives the working fluid to perform heat exchange with the refrigerant in the heat exchanger 2. After the working fluid is heated, it is transported to the coil in the hot water tank 6, and then heats the hot water in the hot water tank 6. When it is detected that the temperature of the hot water tank 6 reaches the set temperature, the working fluid pump 5 stops running. When heating is needed, the heating working fluid pump 7 drives the working fluid to perform heat exchange with the refrigerant in the heating heat exchanger 3. After the working fluid is heated, it is transported to the terminal to heat the room. When cooling is needed, the cooling working fluid pump 9 drives the working fluid to perform heat exchange with the refrigerant in the cooling heat exchanger 4. After the working fluid is cooled, it is transported to the terminal to cool the room.

[0031] It has multiple working modes, cancels the four-way valve structure, and adopts a series structure for each component. There is no need for frequent switching of the four-way valve. When the mode is switched, the refrigerant side continues to operate through the control of the components on the working fluid side, thereby simplifying the structure of the refrigerant side, and changing the auxiliary cross circuit into a simple series circuit, avoiding equipment problems caused by four-way valve failure, increasing the reliability of the main engine operation, and improving the heat exchange efficiency. When the heating demand is not high, the working fluid pump 5 and the heating working fluid pump 7 work together to make full use of the waste heat, and provide hot water through waste heat recovery. Hot water does not increase power consumption in summer, effectively saving energy. When hot water is needed, the refrigerant pipe is no longer used for direct heating, but hot water is heated by secondary heat exchange, which can reduce the use of valves on the refrigerant side and reduce the risk of leakage during the construction of the refrigerant pipeline project. At the same time, the heating temperature can be accurately controlled to avoid high-temperature scaling.

[0032] In the heat pump system provided by the specific embodiment of the present invention, the fan application component includes a first fan 11 and four switch control valves, namely VA1 to VA4. A single heat exchange terminal is arranged in the first fan 11. The four switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank 8 and the cooling buffer water tank 10, and the two switch control valves connected to the outlet of the water tank are simultaneously connected to the inlet of the single heat exchange terminal, and the two switch control valves connected to the inlet of the water tank are simultaneously connected to the outlet of the single heat exchange terminal. Specifically, VA1 connects the outlet of the heating buffer water tank 8 and the inlet of the single heat exchange terminal, VA2 connects the outlet of the cooling buffer water tank 10 and the inlet of the single heat exchange terminal, VA3 connects the inlet of the heating buffer water tank 8 and the outlet of the single heat exchange terminal, and VA4 connects the inlet of the cooling buffer water tank 10 and the outlet of the single heat exchange terminal. During the working process, VA1 and VA3 are opened, VA2 and VA4 are closed, and the first fan 11 is in heating operation; otherwise, the first fan 11 is in cooling operation.

[0033] The fan disk application component includes a second fan disk 12 and four switch control valves, namely VB1 to VB4. A heating heat exchange terminal and a cooling heat exchange terminal are arranged in the second fan disk 12. The four switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank 8 and the cooling buffer water tank 10, and are correspondingly connected to the inlet and outlet of the heating heat exchange terminal and the cooling heat exchange terminal. Specifically, VB1 connects the outlet of the heating buffer water tank 8 and the inlet of the heating heat exchange terminal, VB2 connects the inlet of the heating buffer water tank 8 and the outlet of the heating heat exchange terminal, VB3 connects the outlet of the cooling buffer water tank 10 and the inlet of the cooling heat exchange terminal, and VB4 connects the inlet of the cooling buffer water tank 10 and the outlet of the cooling heat exchange terminal. During the working process, VB1 and VB2 are opened, VB3 and VB4 are closed, the hot working medium enters the heating heat exchange terminal, and the second fan disc 12 enters the heating operation; VB1 and VB2 are closed, VB3 and VB4 are opened, the cold working medium enters the cooling heat exchange terminal, and the second fan disc 12 enters the cooling operation; VB1, VB2, VB3, and VB4 are all opened, the hot working medium enters the heating heat exchange terminal, and the cold working medium enters the cooling heat exchange terminal at the same time, and the second fan disc 12 enters the non-cooling dehumidification operation.

[0034] The fan disk application component includes a third fan disk 13 and seven switch control valves, namely VC1 to VC7. The third fan disk 13 is provided with a front heat exchange terminal and a rear heat exchange terminal. VC1 connects the outlet of the heating buffer water tank 8 and the inlet of the front heat exchange terminal, VC2 connects the inlet of the heating buffer water tank 8 and the outlet of the front heat exchange terminal, VC3 connects the inlet of the heating buffer water tank 8 and the outlet of the rear heat exchange terminal, VC4 connects the outlet of the cooling buffer water tank 10 and the inlet of the front heat exchange terminal, VC5 connects the outlet of the cooling buffer water tank 10 and the inlet of the rear heat exchange terminal, VC6 connects the inlet of the cooling buffer water tank 10 and the outlet of the rear heat exchange terminal, and VC7 connects the outlet of the front heat exchange terminal and the inlet of the rear heat exchange terminal. VC1, VC3, and VC7 are opened, and VC2, VC4, VC5, and VC6 are closed. The hot working medium first passes through the front heat exchange terminal, and then enters the rear heat exchange terminal through VC7, and the third fan disk 13 enters heating operation. VC4, VC6, VC7 are turned on, VC1, VC2, VC3, VC5 are turned off, the cold working medium first passes through the front heat exchange terminal, then enters the rear heat exchange terminal through VC7, and the third fan disk 13 enters the cooling operation. VC1, VC2, VC5, VC6 are turned on, VC3, VC4, VC7 are turned off, the hot working medium enters the front heat exchange terminal, the cold working medium enters the rear heat exchange terminal, and the third fan disk 13 enters the non-cooling dehumidification operation. In the above method, the two heat exchange terminals are used together to improve the utilization rate of the heat exchange terminals, avoid the formation of wind resistance, and ensure performance.

[0035] The three types of fan disks can be freely selected and used in the project according to the needs. You can use only one, two or all three. Instead of using direct heat exchange between refrigerant and air, it uses two-stage heat exchange between refrigerant-working fluid-air, which reduces the amount of refrigerant in the condenser, reduces the overall refrigerant charge, and has high system energy efficiency.

[0036] A floor heating system can also be provided to further improve energy utilization, including a floor heating pipeline 14 and two switch control valves VD1 and VD2, the two switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank 8, and are correspondingly connected to the inlet and outlet of the floor heating pipeline 14. When VD1 and VD2 are turned on, the floor heating starts to operate.

[0037] Furthermore, it also includes a system heat exchanger 15 and four switch control valves, namely VE1 to VE4, the four switch control valves are respectively connected to the inlet and outlet of the heating heat exchanger 3 and the cooling heat exchanger 4, and the two switch control valves connected to the outlets of the heating heat exchanger 3 and the cooling heat exchanger 4 are simultaneously connected to the inlet of the system heat exchanger 15, and the two switch control valves connected to the inlet of the heating heat exchanger 3 and the cooling heat exchanger 4 are simultaneously connected to the outlet of the system heat exchanger 15.

[0038] When the system detects that the entire system is in a cold demand, VE1 and VE3 are turned on, VE2 and VE4 are turned off, the hot working medium releases heat to the air through the system heat exchanger 15, and the fan strengthens the heat exchange; when the system detects that the entire system is in a hot demand, VE1 and VE3 are turned off, VE2 and VE4 are turned on, the cold working medium absorbs heat from the air through the system heat exchanger 15, and the fan strengthens the heat exchange; when the system heat exchanger 15 is in low-temperature heat absorption operation for a long time and frost is formed on the surface, when it is detected that the defrosting conditions are met, VE1 and VE3 are turned on, VE2 and VE4 are turned off, the fan is turned off, and the hot working medium enters the system heat exchanger 15 to melt the frost on the surface of the system heat exchanger 15.

[0039] The flow direction of the refrigerant delivered by the compressor 1 in the heat exchanger 2 is opposite to the flow direction of the working fluid delivered by the working fluid pump 5 in the heat exchanger 2, the flow direction of the refrigerant delivered by the compressor 1 in the heating heat exchanger 3 is opposite to the flow direction of the working fluid delivered by the heating working fluid pump 7 in the heating heat exchanger 3, and the flow direction of the refrigerant delivered by the compressor 1 in the refrigeration heat exchanger 4 is opposite to the flow direction of the working fluid delivered by the refrigeration working fluid pump 7 in the refrigeration heat exchanger 4. At the same time, the flow directions of the refrigerant and the working fluid in the heat exchanger are opposite, and both are countercurrents during the heat release and heat absorption processes, avoiding the situation of forward flow when a four-way valve is used, thereby improving the heat exchange efficiency.

[0040] Please refer to Figure 2 , Figure 2 This is a schematic structural diagram of Embodiment 2 of the heat pump system provided by the present invention.

[0041] In the second embodiment, in order to improve stability, a secondary pump system is adopted, and a first auxiliary pump 17 is provided at the inlet of the heating buffer water tank 8 , and a second auxiliary pump 18 is provided at the inlet of the cooling buffer water tank 10 .

[0042] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of the third embodiment of the heat pump system provided by the present invention; please refer to Figure 4 , Figure 4 This is a structural schematic diagram of Embodiment 4 of the heat pump system provided by the present invention.

[0043] In the third embodiment, a first throttle 16 is provided on the refrigerant pipeline between the heating heat exchanger 3 and the cooling heat exchanger 4. A second throttle 19 and an injection enthalpy heat exchanger 20 are provided between the compressor 1 and the first throttle 16. Increasing the injection enthalpy can improve the cooling and heating capacity.

[0044] In the fourth embodiment, a secondary pump system and jet enthalpy increase are simultaneously used to achieve improved stability and increase the cooling and heating capacities.

[0045] The heat pump system provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A heat pump system, characterized in that: The invention comprises a compressor (1), a heating heat exchanger (3) and a cooling heat exchanger (4), wherein the compressor (1), the heating heat exchanger (3) and the cooling heat exchanger (4) are connected in series, the heating heat exchanger (3) is connected to a heating working fluid pump (7), the cooling heat exchanger (4) is connected to a cooling working fluid pump (9), and the heating working fluid pump (7) and the cooling working fluid pump (9) are also connected to a fan application component at the same time.

2. The heat pump system according to claim 1, characterized in that: It also comprises a heat exchanger (2), a working fluid pump (5) and a hot water tank (6); the heat exchanger (2) is connected in series with the compressor (1), the heating heat exchanger (3) and the cooling heat exchanger (4); and the heat exchanger (2) is connected to the working fluid pump (5) and the hot water tank (6).

3. The heat pump system according to claim 2, characterized in that: The heating heat exchanger (3) and the heating working fluid pump (7) are connected to the fan application component via a heating buffer water tank (8), and the cooling heat exchanger (4) and the cooling working fluid pump (9) are connected to the fan application component via a cooling buffer water tank (10).

4. The heat pump system according to claim 3, characterized in that: The fan application component comprises a first fan (11) and four switch control valves, wherein a single heat exchange end is arranged in the first fan (11), and the four switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank (8) and the cooling buffer water tank (10), and the two switch control valves connected to the water tank outlet are simultaneously connected to the inlet of the single heat exchange end, and the two switch control valves connected to the water tank inlet are simultaneously connected to the outlet of the single heat exchange end.

5. The heat pump system according to claim 3, characterized in that: The air disk application component comprises a second air disk (12) and four switch control valves, wherein a heating heat exchange end and a cooling heat exchange end are arranged in the second air disk (12), and the four switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank (8) and the cooling buffer water tank (10), and are correspondingly connected to the inlet and outlet of the heating heat exchange end and the cooling heat exchange end.

6. The heat pump system according to claim 3, characterized in that: The fan disk application component comprises a third fan disk (13) and seven switch control valves, wherein a front heat exchange end and a rear heat exchange end are arranged in the third fan disk (13), the first switch control valve connects the outlet of the heating buffer water tank (8) and the inlet of the front heat exchange end, the second switch control valve connects the inlet of the heating buffer water tank (8) and the outlet of the front heat exchange end, the third switch control valve connects the inlet of the heating buffer water tank (8) and the outlet of the rear heat exchange end, the fourth switch control valve connects the outlet of the cooling buffer water tank (10) and the inlet of the front heat exchange end, the fifth switch control valve connects the outlet of the cooling buffer water tank (10) and the inlet of the rear heat exchange end, the sixth switch control valve connects the inlet of the cooling buffer water tank (10) and the outlet of the rear heat exchange end, and the seventh switch control valve connects the outlet of the front heat exchange end and the inlet of the rear heat exchange end.

7. The heat pump system according to claim 3, characterized in that: It comprises a floor heating pipeline (14) and two switch control valves, wherein the two switch control valves are respectively connected to the inlet and outlet of the heating buffer water tank (8), and are correspondingly connected to the inlet and outlet of the floor heating pipeline (14).

8. The heat pump system according to claim 1, characterized in that: The system comprises a system heat exchanger (15) and four switch control valves, wherein the four switch control valves are respectively connected to the inlet and outlet of the heating heat exchanger (3) and the cooling heat exchanger (4), and the two switch control valves connected to the outlets of the heating heat exchanger (3) and the cooling heat exchanger (4) are simultaneously connected to the inlet of the system heat exchanger (15), and the two switch control valves connected to the inlet of the heating heat exchanger (3) and the cooling heat exchanger (4) are simultaneously connected to the outlet of the system heat exchanger (15).

9. The heat pump system according to claim 2, characterized in that: The flow direction of the refrigerant transported by the compressor (1) in the heat exchanger (2) is opposite to the flow direction of the refrigerant transported by the working fluid pump (5) in the heat exchanger (2); the flow direction of the refrigerant transported by the compressor (1) in the heating heat exchanger (3) is opposite to the flow direction of the refrigerant transported by the heating working fluid pump (7) in the heating heat exchanger (3); and the flow direction of the refrigerant transported by the compressor (1) in the refrigeration heat exchanger (4) is opposite to the flow direction of the refrigerant transported by the refrigeration working fluid pump (7) in the refrigeration heat exchanger (4).

10. The heat pump system according to claim 1, characterized in that: A first auxiliary pump (17) is provided at the inlet of the heating buffer water tank (8), and a second auxiliary pump (18) is provided at the inlet of the cooling buffer water tank (10).

11. The heat pump system according to any one of claims 1 to 10, characterized in that: A first throttle (16) is provided on the refrigerant pipeline between the heating heat exchanger (3) and the cooling heat exchanger (4), and a second throttle (19) and an injection enthalpy-increasing heat exchanger (20) are provided between the compressor (1) and the first throttle (16).

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