CN112268380B

CN112268380B - Heat pump system, control method and device thereof, air conditioning equipment and storage medium

Info

Publication number: CN112268380B
Application number: CN202011297027.3A
Authority: CN
Inventors: 杨智峰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2024-03-22
Anticipated expiration: 2040-11-18
Also published as: CN112268380A

Abstract

The present disclosure provides a heat pump system, a control method and a control device thereof, an air conditioning device and a storage medium. Wherein, the heat pump system includes: a compressor; a first indoor heat exchanger and a second indoor heat exchanger; an outdoor heat exchanger; a first control valve; the valve assembly is used for controlling the flow direction and the on-off of the refrigerant to form a refrigerant loop; the valve component is connected with the exhaust port and the air suction port of the compressor, the first end of the outdoor heat exchanger and the first end of the second indoor heat exchanger respectively, the first end of the first indoor heat exchanger is connected with the second end of the outdoor heat exchanger, the second end of the first indoor heat exchanger is connected with the second end of the second indoor heat exchanger, the second end of the first indoor heat exchanger is connected with the second end of the outdoor heat exchanger through a first pipeline, and the first control valve is arranged in a pipeline between the first end of the first indoor heat exchanger and the second end of the outdoor heat exchanger. The heat pump system disclosed by the invention does not need to use an electric heating system, so that the energy consumption can be reduced, the energy-saving performance is improved, and the use sensitivity of a user is improved.

Description

Heat pump system, control method and device thereof, air conditioning equipment and storage medium

Technical Field

The disclosure relates to the technical field of air conditioning equipment, and in particular relates to a heat pump system, a control method and device thereof, air conditioning equipment and a storage medium.

Background

Along with the economic development of modern society, people have higher and higher requirements on the temperature and humidity of air in an industrial production environment, and the application field of constant temperature and humidity environment control equipment is also wider and wider. Currently, the mainstream constant temperature and humidity machine is basically configured with an electric heating function. When the constant temperature and humidity machine is used, when the indoor humidity is greater than the set humidity, a refrigeration mode is needed to be entered for dehumidification, and because dehumidification and dehumidification are coupling processes, when the indoor temperature is less than the set temperature, the indoor electric heating system is needed to be started for indoor heating work so as to avoid negative overshoot of the indoor temperature; when the indoor temperature is less than the set temperature, the temperature needs to be raised, but the outdoor heat exchanger of the conventional heat pump air conditioner inevitably frosts under certain working conditions, the frosting can lead to the reduction of heating performance, when the frosting is serious, the air conditioning system needs to perform defrosting treatment, the conventional hot gasified frost can switch the indoor side into an evaporation state, the defrosting process absorbs heat from the indoor side, the temperature fluctuation in the heating process is overlarge, the temperature control and humidity control precision requirement is not met, and the indoor electric heating is used for adjusting the temperature at the moment. However, if the electric heating system is used for heating, the power consumption of the constant temperature and humidity machine increases and the energy efficiency decreases.

Disclosure of Invention

The inventor researches and discovers that the related technology has the problems of increased power consumption and low energy efficiency.

In view of the above, embodiments of the present disclosure provide a heat pump system, a control method and apparatus thereof, an air conditioning device, and a storage medium, which can reduce energy consumption and improve air outlet temperature adjustability.

Some embodiments of the present disclosure provide a heat pump system comprising:

a compressor;

a first indoor heat exchanger and a second indoor heat exchanger;

an outdoor heat exchanger;

a first control valve; and

the valve assembly is used for controlling the flow direction and the on-off of the refrigerant to form a refrigerant loop;

the valve component is connected with the exhaust port and the air suction port of the compressor, the first end of the outdoor heat exchanger and the first end of the second indoor heat exchanger respectively, the first end of the first indoor heat exchanger is connected with the second end of the outdoor heat exchanger, the second end of the first indoor heat exchanger is connected with the second end of the second indoor heat exchanger, the second end of the first indoor heat exchanger is connected with the second end of the outdoor heat exchanger through a first pipeline, and the first control valve is arranged in a pipeline between the first end of the first indoor heat exchanger and the second end of the outdoor heat exchanger.

In some embodiments, the system further comprises a first expansion valve disposed in the conduit between the second end of the first indoor heat exchanger and the second end of the second indoor heat exchanger, and a second expansion valve disposed in the conduit between the second end of the second indoor heat exchanger and the first conduit.

In some embodiments, the heat exchanger further comprises a gas-liquid separator disposed in the pipeline between the first end of the first indoor heat exchanger and the second end of the outdoor heat exchanger, the gas-liquid separator disposed in the pipeline between the second end of the outdoor heat exchanger and the first pipeline, the gas-liquid inlet of the gas-liquid separator connected to the second end of the outdoor heat exchanger through the second pipeline, the gas outlet of the gas-liquid separator connected to the first control valve, and the liquid outlet of the gas-liquid separator connected to the first pipeline.

In some embodiments, the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger, and the valve assembly is connected to the first end of the first outdoor heat exchanger and the first end of the second outdoor heat exchanger, respectively; the second end of the first outdoor heat exchanger and the second end of the second outdoor heat exchanger are connected with the gas-liquid inlet of the gas-liquid separator through a second pipeline.

In some embodiments, a third expansion valve is disposed in a passage connecting the second end of the first outdoor heat exchanger to the second pipe, and a fourth expansion valve is disposed in a passage connecting the second end of the second outdoor heat exchanger to the second pipe.

In some embodiments, the system further comprises a first outdoor fan and a second outdoor fan, the first outdoor fan and the first outdoor heat exchanger are located in the first air duct, the second outdoor fan and the second outdoor heat exchanger are located in the second air duct, and the first air duct and the second air duct are independently arranged.

In some embodiments, the valve assembly comprises: a first four-way valve and a second four-way valve; the first port of the first four-way valve and the first port of the second four-way valve are respectively connected with an exhaust port of the compressor, and the second port of the first four-way valve and the second port of the second four-way valve are respectively connected with the first end of the second indoor heat exchanger; the third port of the first four-way valve is connected with the first end of the second outdoor heat exchanger, and the third port of the second four-way valve is connected with the first end of the first outdoor heat exchanger; the fourth port of the first four-way valve and the fourth port of the second four-way valve are respectively connected with an air suction port of the compressor.

In some embodiments, the valve assembly further comprises: a second control valve and a third control valve; the second control valve is arranged in a pipeline between the second port of the first four-way valve and the first end of the second indoor heat exchanger; the third control valve is disposed in the line between the second port of the second four-way valve and the first end of the second indoor heat exchanger.

In some embodiments, two first throttling elements are also included; one of the first throttling element has a first end communicated with the air suction port of the compressor and a second end communicated with a pipeline between a second port of the first four-way valve and the second control valve; the first end of the other first throttling element is communicated with the air suction port of the compressor, and the second end of the other first throttling element is communicated with a pipeline between the second port of the second four-way valve and the third control valve.

In some embodiments, the indoor unit further comprises an indoor fan, the first indoor heat exchanger and the second indoor heat exchanger are located in the same air duct, and indoor return air generated by the indoor fan sequentially passes through the second indoor heat exchanger and the first indoor heat exchanger.

In some embodiments, the heat exchanger further comprises a second throttling element and a one-way valve, wherein the second throttling element is arranged in a passage between the second end of the first indoor heat exchanger and the liquid inlet of the one-way valve, and the liquid outlet of the one-way valve is connected with the second end of the second indoor heat exchanger.

In some embodiments, further comprising:

a first stop valve provided in a passage between the second end of the outdoor heat exchanger and the first and second indoor heat exchangers;

and the second stop valve is arranged in the passage between the valve assembly and the first end of the second indoor heat exchanger.

In some embodiments, a heat pump system includes an indoor unit including a first indoor heat exchanger and a second indoor heat exchanger, and an outdoor unit including a compressor, an outdoor heat exchanger, and a valve assembly.

Some embodiments of the present disclosure provide a control method of a heat pump system, applied to control the foregoing heat pump system, including:

Determining an operation mode of the heat pump system;

the actions of the valve assembly and the first control valve in the heat pump system are controlled according to a preset control strategy and based on the operation mode.

In some embodiments, further comprising:

when the operation mode is a dehumidification reheating mode or a first heating mode, controlling the action of the first control valve so that the first indoor heat exchanger is used for reheating air;

when the operation mode is a cooling/dehumidifying mode, a defrosting mode or a second heating mode, the action of the first control valve is controlled so that the first indoor heat exchanger stops reheating the air.

determining an operation mode of the heat pump system;

controlling the actions of a valve assembly and a first control valve in the heat pump system according to a preset control strategy and based on an operation mode;

wherein the operation mode includes: at least some embodiments of the present disclosure in the cooling/dehumidifying mode, the first dehumidifying and reheating mode, the second dehumidifying and reheating mode, the third dehumidifying and reheating mode, the first heating mode, the second heating mode, the first defrosting mode, and the second defrosting mode provide one.

In some embodiments, further comprising:

when the operation mode is the second dehumidification reheating mode, the first control valve is controlled to be conducted, the exhaust port of the compressor is controlled to be communicated with the first end of the first outdoor heat exchanger, and the air suction port of the compressor is controlled to be respectively communicated with the first end of the second outdoor heat exchanger and the first end of the second indoor heat exchanger;

when the operation mode is the third dehumidification reheating mode, the first control valve is controlled to be conducted, the exhaust port of the compressor is controlled to be communicated with the first end of the second outdoor heat exchanger, and the air suction port of the compressor is controlled to be respectively communicated with the first end of the first outdoor heat exchanger and the first end of the second indoor heat exchanger.

In some embodiments, further comprising:

and when the indoor humidity is reduced to the preset humidity and the indoor temperature is smaller than the preset temperature in the state that the operation mode is the second dehumidification reheating mode, reducing the heat exchange amount of the first outdoor heat exchanger.

In some embodiments, further comprising:

and after the preset time, if the indoor temperature is still smaller than the preset temperature, the working frequency of the compressor and the heat exchange amount of the second outdoor heat exchanger are increased.

Some embodiments of the present disclosure provide a control apparatus of a heat pump system, including:

a memory; and

A processor, coupled to the memory, configured to perform the aforementioned method based on instructions stored in the memory.

Some embodiments of the present disclosure provide an air conditioning apparatus including the foregoing heat pump system, and a control device of the foregoing heat pump system.

Some embodiments of the present disclosure provide a computer readable storage medium storing computer instructions for execution by a processor to perform the foregoing method.

Therefore, the heat pump system, the control method and the control device thereof, the air conditioning equipment and the storage medium realize the functions of dehumidification and reheating, heating and warming and the like by using the heat pump system, can realize the dehumidification and reheating of heat recovery, can adjust the air outlet temperature, can reduce energy consumption without using an electric heating system, and can improve the energy-saving performance.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of some embodiments of a heat pump system according to the present disclosure;

FIG. 2 is a schematic diagram of a heat pump system refrigerant flow path in a cooling/dehumidification mode in accordance with some embodiments of the heat pump system of the present disclosure;

FIG. 3 is a schematic diagram of a heat pump system refrigerant flow path in a first dehumidification reheat mode in accordance with some embodiments of the heat pump system of the present disclosure;

FIG. 4 is a schematic diagram of a heat pump system refrigerant flow path in a second dehumidification reheat mode in accordance with some embodiments of the heat pump system of the present disclosure;

FIG. 5 is a schematic diagram of a heat pump system refrigerant flow path in a third dehumidification reheat mode in accordance with some embodiments of the heat pump system of the present disclosure;

FIG. 6 is a schematic diagram of a heat pump system refrigerant flow path in a first heating mode according to some embodiments of the heat pump system of the present disclosure;

FIG. 7 is a schematic diagram of a heat pump system refrigerant flow path in a second heating mode according to some embodiments of the heat pump system of the present disclosure;

FIG. 8 is a schematic diagram of a heat pump system refrigerant flow path in a first defrost mode in accordance with some embodiments of the heat pump system of the present disclosure;

fig. 9 is a schematic diagram of a heat pump system refrigerant flow path in a second defrost mode in accordance with some embodiments of the heat pump system of the present disclosure.

Description of the reference numerals

01. A valve assembly; 02. an outdoor heat exchanger; 1. a compressor; 2. a first four-way valve; 3. a second four-way valve; 4. a second control valve; 5. a third control valve; 6. a first outdoor heat exchanger; 7. a second outdoor heat exchanger; 8. a third expansion valve; 9. a fourth expansion valve; 10. a first outdoor fan; 11. a second outdoor fan; 12. a first stop valve; 13. a second shut-off valve; 14. a gas-liquid separator; 15. a first control valve; 16. a first throttling element; 17. a first indoor heat exchanger; 18. a second indoor heat exchanger; 19. indoor side blower; 20. a first expansion valve; 21. a second throttling element; 22. a one-way valve; 23. a second expansion valve; 100. an outdoor unit; 200. an indoor unit.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

In this disclosure, when a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device. When it is described that a particular device is connected to other devices, the particular device may be directly connected to other devices without intervening devices, or may be directly connected to other devices without intervening devices.

All terms used in the present disclosure have the same meaning as understood by one of ordinary skill in the art to which the present disclosure pertains, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.

As shown in fig. 1, some embodiments of the present disclosure provide a heat pump system comprising: the air conditioner comprises a compressor 1, a first indoor heat exchanger 17, a second indoor heat exchanger 18, an outdoor heat exchanger 02, a first control valve 15 and a valve assembly 01, wherein the valve assembly 01 is used for controlling the flow direction and the on-off of a refrigerant to form a refrigerant loop, the valve assembly 01 is respectively connected with an air outlet and an air suction port of the compressor 1, a first end of the outdoor heat exchanger 02 and a first end of the second indoor heat exchanger 18, the first end of the first indoor heat exchanger 17 is connected with a second end of the outdoor heat exchanger 02, the second end of the first indoor heat exchanger 17 is connected with a second end of the second indoor heat exchanger 18, and the first control valve 15 is arranged in a pipeline between the first end of the first indoor heat exchanger 17 and the second end of the outdoor heat exchanger 02.

The air sent out by the heat pump system under the dehumidification function is cool, and needs to be reheated and supplied with air, and through the actions of the control valve assembly 01 and the first control valve 15, as shown in fig. 3 to 5, the high-temperature and high-pressure refrigerant output by the exhaust port of the compressor 1 passes through the outdoor heat exchanger 02 and becomes medium-temperature and medium-pressure refrigerant, so that the refrigerant enters the first indoor heat exchanger 17, the first indoor heat exchanger 17 generates condensation heat, the refrigerant output by the first indoor heat exchanger 17 enters the refrigerant loop of the heat pump system through the second indoor heat exchanger 18, dehumidification and reheating are realized while the basic function of the heat pump system is maintained, when the indoor humidity is higher than the set humidity, dehumidification is needed to enter a refrigeration mode, and dehumidification are coupling processes, and when the indoor temperature is lower than the set temperature, the condensation heat generated by the first indoor heat exchanger 17 is utilized for reheating and supplying air, so that the indoor temperature negative overshoot is avoided. By reheating the air by utilizing the condensation heat generated by the first indoor heat exchanger 17, an air reheating function during dehumidification is realized, which is more economical and energy-saving compared with an electric heating system.

In some embodiments, as shown in fig. 1-9, the heat pump system further comprises a first expansion valve 20 and a second expansion valve 23, the first expansion valve 20 being disposed in the line between the second end of the first indoor heat exchanger 17 and the second end of the second indoor heat exchanger 18, the second expansion valve 23 being disposed in the line between the second end of the second indoor heat exchanger 18 and the first line. As shown in fig. 3 to 5, the refrigerant outputted from the first indoor heat exchanger 17 after generating condensation heat is throttled by the first expansion valve 20 to become a low-temperature low-pressure refrigerant, and then enters the second indoor heat exchanger 18, the refrigerant obtained from the outdoor heat exchanger 02 after becoming a medium-temperature medium-pressure refrigerant is passed through the second expansion valve 23 to become a low-temperature low-pressure refrigerant, and then enters the second indoor heat exchanger 18, and the second indoor heat exchanger 18 performs cooling and dehumidifying operations, so that the operation reliability and stability of the system are ensured.

In some embodiments, as shown in fig. 1 to 9, the heat pump system further includes a gas-liquid separator 14, the gas-liquid separator 14 is disposed in a pipeline between the first end of the first indoor heat exchanger 17 and the second end of the outdoor heat exchanger 02, the gas-liquid separator 14 is disposed in a pipeline between the second end of the outdoor heat exchanger 02 and the first pipeline, a gas-liquid inlet of the gas-liquid separator 14 is connected to the second end of the outdoor heat exchanger 02 through the second pipeline, a gas outlet of the gas-liquid separator is connected to the first control valve 15, and a liquid outlet of the gas-liquid separator is connected to the first pipeline. The gas-liquid separator 14 can separate the refrigerant into medium-temperature medium-pressure refrigerant after the outdoor heat exchanger 02 and introduce the gas refrigerant into the first indoor heat exchanger 17, so that the first indoor heat exchanger 17 can generate condensation heat well, the heat exchange efficiency is improved, the gas-liquid separator 14 can also temporarily store the refrigerant, the operation stability of a heat pump system is ensured, and the high practicability is realized.

In some embodiments, as shown in connection with fig. 1-9, the outdoor heat exchanger 02 comprises a first outdoor heat exchanger 6 and a second outdoor heat exchanger 7, and the valve assembly 01 is connected to a first end of the first outdoor heat exchanger 6 and a first end of the second outdoor heat exchanger 7, respectively; the second end of the first outdoor heat exchanger 6 and the second end of the second outdoor heat exchanger 7 are connected to the gas-liquid inlet of the gas-liquid separator 14 through a second pipe. Through setting up two indoor heat exchangers and two outdoor heat exchangers 02, under dehumidification reheat mode, two outdoor heat exchangers 02 can independently distribute the refrigerant through two indoor heat exchangers respectively, have realized the independent adjustability of indoor temperature and humidity, have improved indoor air-out temperature adjustability under the circumstances of reducing the energy consumption to obtain ideal indoor humidity and temperature.

In order to achieve that the heat dissipation capacity of the two outdoor heat exchangers 02 can be adjusted independently, in some embodiments, as shown in fig. 2 to 9, the heat pump system further includes a first outdoor fan 10 and a second outdoor fan 11, where the first outdoor fan 10 and the first outdoor heat exchanger 6 are located in a first air duct, and the second outdoor fan 11 and the second outdoor heat exchanger 7 are located in a second air duct, and the first air duct and the second air duct are set independently.

In order to ensure heat exchange stability, as shown in fig. 2 to 9, in some embodiments, a third expansion valve 8 is disposed in a passage where the second end of the first outdoor heat exchanger 6 is connected to the second pipeline, and a fourth expansion valve 9 is disposed in a passage where the second end of the second outdoor heat exchanger 7 is connected to the second pipeline.

In some embodiments, as shown in connection with fig. 2 to 9, the heat pump system further includes an indoor side fan 19, the first indoor heat exchanger 17 and the second indoor heat exchanger 18 are located in the same air duct, and indoor side return air generated by the indoor side fan 19 sequentially passes through the second indoor heat exchanger 18 and the first indoor heat exchanger 17.

As one implementation of the valve assembly 01, in some embodiments, as shown in fig. 2-9, the valve assembly 01 includes: a first four-way valve 2 and a second four-way valve 3; the first port D1 of the first four-way valve 2 and the first port D2 of the second four-way valve 3 are respectively connected with an exhaust port of the compressor 1, and the second port E1 of the first four-way valve 2 and the second port E2 of the second four-way valve 3 are respectively connected with the first end of the second indoor heat exchanger 18; the third port C1 of the first four-way valve 2 is connected with the first end of the second outdoor heat exchanger 7, and the third port C2 of the second four-way valve 3 is connected with the first end of the first outdoor heat exchanger 6; the fourth port S1 of the first four-way valve 2 and the fourth port S2 of the second four-way valve 3 are connected to the intake port of the compressor 1, respectively.

In some embodiments, as shown in fig. 2-9, the valve assembly 01 further comprises: a second control valve 4 and a third control valve 5; the second control valve 4 is arranged in a pipeline between the second port E1 of the first four-way valve 2 and the first end of the second indoor heat exchanger 18; the third control valve 5 is provided in a line between the second port E2 of the second four-way valve 3 and the first end of the second indoor heat exchanger 18. In some embodiments, the control valves include solenoid valves that are turned on when power is applied and turned off when power is lost.

In some embodiments, as shown in fig. 2-9, the heat pump system further includes two first throttling elements 16; one of the first throttling element 16 has a first end communicating with the suction port of the compressor 1 and a second end communicating with a conduit between the second port E1 of the first four-way valve 2 and the second control valve 4; the other first throttling element 16 has a first end communicating with the suction port of the compressor 1 and a second end communicating with the line between the second port E2 of the second four-way valve 3 and the third control valve 5. In some embodiments, the first throttling element 16 comprises a capillary tube or the like. The first throttling element 16 is connected with the second port E1 of the first four-way valve 2 and the air suction port of the compressor 1, so that when the second control valve 4 is powered down (closed) in the second dehumidification reheating mode, liquid refrigerant between the second port E1 of the first four-way valve 2 and the second control valve 4 is discharged, and the problem of liquid impact during reversing of the first four-way valve 2 is avoided. Similarly, the first throttling element 16 is connected with the second port E2 of the second four-way valve 3 and the air suction port of the compressor 1, so that when the third control valve 5 is powered down (closed) in the third dehumidification reheating mode, liquid refrigerant between the second port E2 of the second four-way valve 3 and the third control valve 5 is discharged, and the problem of liquid impact during reversing of the second four-way valve 3 is avoided.

In some embodiments, as shown in fig. 2-9, the heat pump system further includes a second throttling element 21 and a check valve 22, where the second throttling element 21 is disposed in a path between the second end of the first indoor heat exchanger 17 and the liquid inlet of the check valve 22, and the liquid outlet of the check valve 22 is connected to the second end of the second indoor heat exchanger 18. The second throttling element 21 is provided to switch the first indoor heat exchanger 17 to the low pressure side while discharging the liquid refrigerant therein at the time of the cooling/dehumidifying mode, thereby avoiding the problem of the liquid storage of the first indoor heat exchanger 17. The check valve 22 prevents the refrigerant from flowing back into the first indoor heat exchanger 17.

In some embodiments, as shown in fig. 2 to 9, the heat pump system further includes a first stop valve 12 and a second stop valve 13, the first stop valve 12 being disposed in a path between the second end of the outdoor heat exchanger 02 and the first end of the first indoor heat exchanger 17 and the second indoor heat exchanger 18; the second shut-off valve 13 is provided in the passage between the valve assembly 01 and the first end of the second indoor heat exchanger 18.

In some embodiments, as shown in fig. 2 to 9, the heat pump system includes an indoor unit 200 and an outdoor unit 100, the indoor unit 200 includes a first indoor heat exchanger 17 and a second indoor heat exchanger 18, and the outdoor unit 100 includes a compressor 1, an outdoor heat exchanger 02, and a valve assembly 01. That is, in this embodiment, the compressor 1 is provided in the outdoor unit.

Accordingly, some embodiments of the present disclosure provide a control method of a heat pump system, applied to control the aforementioned heat pump system, including:

determining an operation mode of the heat pump system;

the actions of the valve assembly 01 and the first control valve 15 in the heat pump system are controlled according to a preset control strategy and based on the operation mode.

In some embodiments, the operating mode includes: at least one of a cooling/dehumidifying mode, a first dehumidifying and reheating mode, a second dehumidifying and reheating mode, a third dehumidifying and reheating mode, a first heating mode, a second heating mode, a first defrosting mode and a second defrosting mode.

In some embodiments, the method further comprises:

when the operation mode is the dehumidification reheat mode or the first heating mode, the operation of the first control valve 15 is controlled so that the first indoor heat exchanger 17 is used for reheating the air;

when the operation mode is the cooling/dehumidifying mode, the defrosting mode, or the second heating mode, the operation of the first control valve is controlled to stop the reheating of the air by the first indoor heat exchanger 17.

In some embodiments, as shown in fig. 2, when the operation mode is the cooling/dehumidifying mode, the first port D1 of the first four-way valve 2 is controlled to communicate with the third port C1, and the second port E1 is controlled to communicate with the fourth port S1; the first port D2 of the second four-way valve 3 is controlled to be communicated with the third port C2, and the second port E2 is controlled to be communicated with the fourth port S2; the first control valve 15 is controlled to be in the off state, and the second control valve 4 and the third control valve 5 are controlled to be in the on state.

As shown in fig. 2, in the cooling/dehumidifying mode, the refrigerant discharged from the discharge port of the compressor 1 does not pass through the first indoor heat exchanger 17, and the first indoor heat exchanger 17 does not operate. One path of refrigerant discharged from the exhaust port of the compressor 1 passes through the second four-way valve 3, the first outdoor heat exchanger 6, the third expansion valve 8, the first stop valve 12, the gas-liquid separator 14, the second expansion valve 23, the second indoor heat exchanger 18, the second stop valve 13, the second control valve 4 and the third control valve 5, the first four-way valve 2 and the second four-way valve 3, and returns to the air suction port of the compressor 1.

The other refrigerant discharged from the discharge port of the compressor 1 passes through the first four-way valve 2, the second outdoor heat exchanger 7, the fourth expansion valve 9, the first shutoff valve 12, the gas-liquid separator 14, the second expansion valve 23, the second indoor heat exchanger 18, the second shutoff valve 13, the second control valve 4 and the third control valve 5, the first four-way valve 2 and the second four-way valve 3, and returns to the suction port of the compressor 1.

In some embodiments, as shown in fig. 3, when the operation mode is the first dehumidifying and reheating mode, the first port D1 of the first four-way valve 2 is controlled to communicate with the third port C1, and the second port E1 is controlled to communicate with the fourth port S1; the first port D2 of the second four-way valve 3 is controlled to be communicated with the third port C2, and the second port E2 is controlled to be communicated with the fourth port S2; the first control valve 15, the second control valve 4, and the third control valve 5 are controlled to be in the on state.

As shown in fig. 3, in the first dehumidification reheat mode, one path of refrigerant discharged from the exhaust port of the compressor 1 enters the gas-liquid separator 14 through the second four-way valve 3, the first outdoor heat exchanger 6, the third expansion valve 8 and the first stop valve 12, and the gaseous refrigerant separated by the gas-liquid separator 14 enters the first indoor heat exchanger 17, then enters the second indoor heat exchanger 18 through the first expansion valve 20. The liquid refrigerant separated by the gas-liquid separator 14 passes through the second expansion valve 23 and enters the second indoor heat exchanger 18. The first indoor heat exchanger 17 generates condensation heat, the second indoor heat exchanger 18 performs cooling and dehumidifying operation, and the refrigerant passing through the second indoor heat exchanger 18 returns to the air suction port of the compressor 1 through the second stop valve 13, the second control valve 4, the third control valve 5, the first four-way valve 2 and the second four-way valve 3.

The other path of refrigerant discharged from the exhaust port of the compressor 1 enters the gas-liquid separator 14 through the first four-way valve 2, the second outdoor heat exchanger 7, the fourth expansion valve 9 and the first stop valve 12, and the gaseous refrigerant separated by the gas-liquid separator 14 enters the first indoor heat exchanger 17, then enters the second indoor heat exchanger 18 through the first expansion valve 20. The liquid refrigerant separated by the gas-liquid separator 14 passes through the second expansion valve 23 and enters the second indoor heat exchanger 18. The first indoor heat exchanger 17 generates condensation heat, the second indoor heat exchanger 18 performs cooling and dehumidifying operation, and the refrigerant passing through the second indoor heat exchanger 18 returns to the air suction port of the compressor 1 through the second stop valve 13, the second control valve 4, the third control valve 5, the first four-way valve 2 and the second four-way valve 3.

In some embodiments, as shown in fig. 4, when the operation mode is the second dehumidifying and reheating mode, the first port D1 of the first four-way valve 2 is controlled to communicate with the second port E1, and the third port C1 is controlled to communicate with the fourth port S1; the first port D2 of the second four-way valve 3 is controlled to be communicated with the third port C2, and the second port E2 is controlled to be communicated with the fourth port S2; the first control valve 15 and the third control valve 5 are controlled to be in an on state, and the second control valve 4 is controlled to be in an off state.

As shown in fig. 4, in the second dehumidification reheat mode, after the refrigerant discharged from the discharge port of the compressor 1 passes through the second four-way valve 3, the first outdoor heat exchanger 6 and the third expansion valve 8, one path of refrigerant returns to the suction port of the compressor 1 through the fourth expansion valve 9, the second outdoor heat exchanger 7 and the first four-way valve 2; the other path of refrigerant enters the gas-liquid separator 14 through the first stop valve 12, and the gaseous refrigerant separated by the gas-liquid separator 14 enters the first indoor heat exchanger 17, then enters the second indoor heat exchanger 18 through the first expansion valve 20. The liquid refrigerant separated by the gas-liquid separator 14 passes through the second expansion valve 23 and enters the second indoor heat exchanger 18. The first indoor heat exchanger 17 generates condensation heat, the second indoor heat exchanger 18 performs cooling and dehumidifying operation, and the refrigerant passing through the second indoor heat exchanger 18 returns to the air suction port of the compressor 1 through the second stop valve 13, the second control valve 4, the third control valve 5, the first four-way valve 2 and the second four-way valve 3.

In some embodiments, as shown in fig. 5, when the operation mode is the third dehumidifying and reheating mode, the first port D1 of the first four-way valve 2 is controlled to communicate with the third port C1, and the second port E1 is controlled to communicate with the fourth port S1; the first port D2 of the second four-way valve 3 is controlled to be communicated with the second port E2, and the third port C2 is controlled to be communicated with the fourth port S2; the first control valve 15 and the second control valve 4 are controlled to be in an on state, and the third control valve 5 is controlled to be in an off state.

As shown in fig. 5, in the third dehumidification reheat mode, after the refrigerant discharged from the discharge port of the compressor 1 passes through the first four-way valve 2, the second outdoor heat exchanger 7 and the fourth expansion valve 9, one path of refrigerant returns to the suction port of the compressor 1 through the third expansion valve 8, the first outdoor heat exchanger 6 and the second four-way valve 3; the other path of refrigerant enters the gas-liquid separator 14 through the first stop valve 12, and the gaseous refrigerant separated by the gas-liquid separator 14 enters the first indoor heat exchanger 17, then enters the second indoor heat exchanger 18 through the first expansion valve 20. The liquid refrigerant separated by the gas-liquid separator 14 passes through the second expansion valve 23 and enters the second indoor heat exchanger 18. The first indoor heat exchanger 17 generates condensation heat, the second indoor heat exchanger 18 performs cooling and dehumidifying operation, and the refrigerant passing through the second indoor heat exchanger 18 returns to the air suction port of the compressor 1 through the second stop valve 13, the second control valve 4, the third control valve 5, the first four-way valve 2 and the second four-way valve 3.

In some embodiments, dehumidification and reheating are achieved by the first indoor heat exchanger 17 and the second indoor heat exchanger 18 cooperating with each other, the second indoor heat exchanger 18 is responsible for dehumidification and cooling, and since the indoor wet load and the cold load are unequal, the output of the heat pump system is based on the adjustment of the wet load and the cold load, when the wet load is larger than the cold load, the indoor temperature overshoot is caused (the current indoor environment temperature is lower than the set temperature), and at this time, the first indoor heat exchanger 17 intervenes in adjusting the cold load, that is, compensates for outputting excessive refrigerating capacity, so that the indoor temperature is matched with the set value.

In some embodiments, the method further comprises:

and when the indoor humidity is reduced to the preset humidity and the indoor temperature is smaller than the preset temperature in the state that the operation mode is the second dehumidification reheating mode, the heat exchange amount of the first outdoor heat exchanger 6 is reduced. The control is such that the heat exchange amount of the first indoor heat exchanger 17 is increased, thereby increasing the indoor temperature.

When the indoor temperature is still smaller than the preset temperature after the preset time, the working frequency of the compressor 1 and the heat exchange amount of the second outdoor heat exchanger 7 are increased, so that the heat exchange amount of the first indoor heat exchanger 17 is further increased by controlling, and the indoor temperature is increased, and the heat exchange amount of the second indoor heat exchanger 18 is kept unchanged by increasing the heat exchange amount of the second outdoor heat exchanger 7 due to the increase of the frequency of the compressor, so that the indoor humidity is kept unchanged.

In some embodiments, the method further comprises:

in the state that the operation mode is the third dehumidification reheat mode, when the indoor humidity is reduced to the preset humidity and the indoor temperature is smaller than the preset temperature, the heat exchange amount of the second outdoor heat exchanger 7 is reduced. The control is such that the heat exchange amount of the first indoor heat exchanger 17 is increased, thereby increasing the indoor temperature.

When the indoor temperature is still smaller than the preset temperature after the preset time, the working frequency of the compressor 1 and the heat exchange amount of the first outdoor heat exchanger 6 are increased, so that the heat exchange amount of the first indoor heat exchanger 17 is further increased by controlling, and the indoor temperature is increased, and the heat exchange amount of the second indoor heat exchanger 18 is increased due to the increase of the frequency of the compressor, so that the heat exchange amount of the second indoor heat exchanger 18 is kept unchanged by increasing the heat exchange amount of the first outdoor heat exchanger 6, and the indoor humidity is kept unchanged.

In one embodiment, when there is a cold load or a wet load in the room, the system first enters a cooling/dehumidifying mode, the cold load may be represented using a functional relationship of the difference between the indoor ambient temperature and the set temperature, and the wet load may be represented using a functional relationship of the difference between the indoor moisture content and the set moisture content. When the wet load is greater than the cold load, for example, the moisture content is less than the set value, but the indoor temperature is already lower than the set value, the first dehumidification reheat mode is entered.

When the heat exchange amount of the indoor heat exchanger is maximum in the first dehumidification and reheating mode, the indoor wet load requirement is still not met, and the second dehumidification and reheating mode is entered, as shown in fig. 4, the heat exchange amount of the first indoor heat exchanger 17 is increased by reducing the first outdoor heat exchanger 6; by increasing the heat exchange amount of the second outdoor heat exchanger 7, the heat exchange amount of the second indoor heat exchanger 18 is reduced. Or enters the third dehumidification reheat mode, as shown in fig. 5, by decreasing the heat exchange amount of the second outdoor heat exchanger 7, the heat exchange amount of the first indoor heat exchanger 17 is increased; by increasing the heat exchange amount of the first outdoor heat exchanger 6, the heat exchange amount of the second indoor heat exchanger 18 is reduced. The two outdoor heat exchangers 02 can respectively and independently distribute refrigerants passing through the two indoor heat exchangers, so that independent adjustment of indoor temperature and humidity is realized, and the indoor air-out temperature adjustability is improved under the condition of reducing energy consumption, so that ideal indoor humidity and temperature are obtained.

In the heating process, the wet load is generally a humidification load, and the constant temperature and humidity machine is provided with a special humidifier and does not involve the action of an indoor heat exchanger; the winter heat load is mainly realized by the mutual cooperation of the first indoor heat exchanger 17 and the second indoor heat exchanger 18. When the indoor heat load is required, the first heating mode or the second heating mode is started, and the first defrosting mode or the second defrosting mode is triggered according to the condition surface corresponding to whether defrosting is required by the corresponding outdoor side heat exchanger or not.

In some embodiments, as shown in fig. 6, when the operation mode is the first heating mode, the first port D1 of the first four-way valve 2 is controlled to communicate with the second port E1, and the third port C1 is controlled to communicate with the fourth port S1; the first port D1 of the second four-way valve 3 is controlled to be communicated with the second port E1, and the third port C1 is controlled to be communicated with the fourth port S1; the first control valve 15, the second control valve 4, and the third control valve 5 are controlled to be in the on state.

As shown in fig. 6, in the first heating mode, one path of refrigerant discharged from the exhaust port of the compressor 1 passes through the second stop valve 13 by the first four-way valve 2 and the second control valve 4, the other path of refrigerant passes through the second stop valve 13 by the second four-way valve 3 and the third control valve 5, then enters the second indoor heat exchanger 18, the one path of refrigerant enters the gas-liquid separator 14 by the first expansion valve 20, the first indoor heat exchanger 17 and the first control valve 15, and the other path of refrigerant enters the gas-liquid separator 14 by the second expansion valve 23. The refrigerant with high temperature and high pressure enters the second indoor heat exchanger 18, and the second indoor heat exchanger 18 generates condensation heat; the refrigerant is throttled into medium-temperature medium-pressure refrigerant by the first expansion valve 20, and enters the first indoor heat exchanger 17, and the first indoor heat exchanger 17 also generates condensation heat.

The refrigerant outputted by the gas-liquid separator 14 passes through the first stop valve 12, and one path of refrigerant returns to the air suction port of the compressor 1 through the third expansion valve 8, the first outdoor heat exchanger 6 and the second four-way valve 3; the other path of refrigerant returns to the air suction port of the compressor 1 through the fourth expansion valve 9, the second outdoor heat exchanger 7 and the first four-way valve 2.

In some embodiments, as shown in fig. 7, the first port D1 of the first four-way valve 2 is controlled to communicate with the second port E1, and the third port C1 is controlled to communicate with the fourth port S1; the first port D2 of the second four-way valve 3 is controlled to be communicated with the second port E2, and the third port C2 is controlled to be communicated with the fourth port S2; the first control valve 15 is controlled to be in an off state, and the second control valve 4 and the third control valve 5 are controlled to be in an on state.

As shown in fig. 7, in the second heating mode, the refrigerant discharged from the discharge port of the compressor 1 does not pass through the first indoor heat exchanger 17, and the first indoor heat exchanger 17 does not operate. One path of refrigerant discharged from the exhaust port of the compressor 1 passes through the second stop valve 13 through the first four-way valve 2 and the second control valve 4, the other path of refrigerant passes through the second stop valve 13 through the second four-way valve 3 and the third control valve 5, and then enters the second indoor heat exchanger 18, and the refrigerant enters the gas-liquid separator 14 through the second expansion valve 23. The high-temperature and high-pressure refrigerant enters the second indoor heat exchanger 18, and the second indoor heat exchanger 18 generates condensation heat.

When the indoor temperature is less than the set temperature, the temperature needs to be raised, but the heat pump system has the problem that the outdoor heat exchanger 02 frosts and frosts, and the temperature fluctuation can not meet the requirement, and at the moment, the frosting needs to be carried out.

In some embodiments, as shown in fig. 8, when the operation mode is the first defrosting mode, the first port D1 of the first four-way valve 2 is controlled to communicate with the third port C1, and the second port E1 is controlled to communicate with the fourth port S1; the first port D2 of the second four-way valve 3 is controlled to be communicated with the second port E2, and the third port C2 is controlled to be communicated with the fourth port S2; the first control valve 15 and the second control valve 4 are controlled to be in the off state, and the third control valve 5 is controlled to be in the on state.

As shown in fig. 8, in the first defrosting mode, the refrigerant discharged from the discharge port of the compressor 1 does not pass through the first indoor heat exchanger 17, and the first indoor heat exchanger 17 does not operate. The first path of refrigerant discharged from the exhaust port of the compressor 1 passes through the second stop valve 13 through the second four-way valve 3 and the third control valve 5, then enters the second indoor heat exchanger 18, and then enters the gas-liquid separator 14 through the second expansion valve 23. The high-temperature and high-pressure refrigerant enters the second indoor heat exchanger 18, and the second indoor heat exchanger 18 generates condensation heat. The refrigerant outputted from the gas-liquid separator 14 passes through the first stop valve 12, and one path of refrigerant passes through the third expansion valve 8, the first outdoor heat exchanger 6 and the second four-way valve 3, and returns to the air suction port of the compressor 1.

After passing through the first four-way valve 2, the second outdoor heat exchanger 7 and the fourth expansion valve 9, the second refrigerant discharged from the discharge port of the compressor 1 passes through the third expansion valve 8, the first outdoor heat exchanger 6 and the second four-way valve 3, and returns to the suction port of the compressor 1. The second outdoor heat exchanger 7 generates condensation heat, and performs defrosting treatment of the second outdoor heat exchanger 02.

In some embodiments, as shown in fig. 9, when the operation mode is the second defrosting mode, the first port D1 of the first four-way valve 2 is controlled to communicate with the second port E1, and the third port C1 is controlled to communicate with the fourth port S1; the first port D2 of the second four-way valve 3 is controlled to be communicated with the third port C2, and the second port E2 is controlled to be communicated with the fourth port S2; the first control valve 15 and the third control valve 5 are controlled to be in the off state, and the second control valve 4 is controlled to be in the on state.

As shown in fig. 9, in the second defrosting mode, the refrigerant discharged from the discharge port of the compressor 1 does not pass through the first indoor heat exchanger 17, and the first indoor heat exchanger 17 does not operate. The first path of refrigerant discharged from the exhaust port of the compressor 1 passes through the first four-way valve 2 and the second control valve 4, passes through the second stop valve 13, then enters the second indoor heat exchanger 18, and then enters the gas-liquid separator 14 through the second expansion valve 23. The high-temperature and high-pressure refrigerant enters the second indoor heat exchanger 18, and the second indoor heat exchanger 18 generates condensation heat. The refrigerant outputted from the gas-liquid separator 14 passes through the first shutoff valve 12, passes through the fourth expansion valve 9, the second outdoor heat exchanger 7, and the first four-way valve 2, and returns to the intake port of the compressor 1.

The second refrigerant discharged from the discharge port of the compressor 1 passes through the second four-way valve 3, the first outdoor heat exchanger 6, and the third expansion valve 8, and then passes through the fourth expansion valve 9, the second outdoor heat exchanger 7, and the first four-way valve 2, and returns to the suction port of the compressor 1. The first outdoor heat exchanger 6 generates condensation heat, and performs defrosting treatment of the first outdoor heat exchanger 02.

The heat pump system uses the double outdoor heat exchangers, asynchronous defrosting can be achieved by adopting the first defrosting mode and the second defrosting mode, the indoor heat exchanger still keeps a high-pressure state during defrosting, indoor heat output is kept, and indoor temperature fluctuation caused by the fact that the indoor heat exchanger does not heat is reduced during defrosting of a common heat pump air conditioner.

Some embodiments of the present disclosure provide a control device of a heat pump system, comprising a memory for storing instructions and a processor coupled to the memory, configured to perform the aforementioned method based on the instructions stored in the memory.

In some embodiments, the memory includes high-speed RAM memory, non-volatile memory (nonvolatile memory), and the like, and in other embodiments, the memory includes a memory array. The memory may also be partitioned and the blocks may be combined into virtual volumes according to certain rules. The processor includes a central processing unit CPU, or an application specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the control methods of the heat pump system of the present disclosure.

Some embodiments of the present disclosure provide an air conditioning apparatus including the foregoing heat pump system, and a control device of the foregoing heat pump system. In some embodiments, the air conditioning apparatus is a heat pump type constant temperature and humidity machine or the like.

Thus, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A heat pump system, comprising:

a compressor (1);

a first indoor heat exchanger (17) and a second indoor heat exchanger (18);

an outdoor heat exchanger (02);

a first control valve (15); and

the valve assembly (01) is used for controlling the flow direction and the on-off of the refrigerant to form a refrigerant loop;

the valve assembly (01) is respectively connected with the exhaust port and the air suction port of the compressor (1), the first end of the outdoor heat exchanger (02) and the first end of the second indoor heat exchanger (18), the first end of the first indoor heat exchanger (17) is connected with the second end of the outdoor heat exchanger (02), the second end of the first indoor heat exchanger (17) is connected with the second end of the second indoor heat exchanger (18) and is connected with the second end of the outdoor heat exchanger (02) through a first pipeline, and the first control valve (15) is arranged in a pipeline between the first end of the first indoor heat exchanger (17) and the second end of the outdoor heat exchanger (02);

the heat pump system has a dehumidification reheat mode in which the valve assembly (01) and the first control valve (15) are configured to act such that the heat of condensation generated by the first indoor heat exchanger (17) reheats air.

2. The heat pump system according to claim 1, further comprising a first expansion valve (20) and a second expansion valve (23), the first expansion valve (20) being arranged in a line between the second end of the first indoor heat exchanger (17) and the second end of the second indoor heat exchanger (18), the second expansion valve (23) being arranged in a line between the second end of the second indoor heat exchanger (18) and the first line.

3. The heat pump system according to claim 2, further comprising a gas-liquid separator (14), the gas-liquid separator (14) being arranged in a line between the first end of the first indoor heat exchanger (17) and the second end of the outdoor heat exchanger (02), the gas-liquid separator (14) being arranged in a line between the second end of the outdoor heat exchanger (02) and the first line, a gas-liquid inlet of the gas-liquid separator (14) being connected to the second end of the outdoor heat exchanger (02) through a second line, a gas outlet of the gas-liquid separator being connected to the first control valve (15), a liquid outlet of the gas-liquid separator being connected to the first line.

4. A heat pump system according to claim 3, wherein the outdoor heat exchanger (02) comprises a first outdoor heat exchanger (6) and a second outdoor heat exchanger (7), the valve assembly (01) being connected to a first end of the first outdoor heat exchanger (6) and a first end of the second outdoor heat exchanger (7), respectively; the second end of the first outdoor heat exchanger (6) and the second end of the second outdoor heat exchanger (7) are connected with the gas-liquid inlet of the gas-liquid separator (14) through the second pipeline.

5. The heat pump system according to claim 4, wherein a third expansion valve (8) is provided in a passage connecting the second end of the first outdoor heat exchanger (6) to the second pipe, and a fourth expansion valve (9) is provided in a passage connecting the second end of the second outdoor heat exchanger (7) to the second pipe.

6. The heat pump system of claim 4, further comprising a first outdoor fan (10) and a second outdoor fan (11), the first outdoor fan (10) and the first outdoor heat exchanger (6) being located in a first air duct, the second outdoor fan (11) and the second outdoor heat exchanger (7) being located in a second air duct, the first air duct being provided independently of the second air duct.

7. The heat pump system according to claim 4, wherein the valve assembly (01) comprises: a first four-way valve (2) and a second four-way valve (3); a first port (D1) of the first four-way valve (2) and a first port (D2) of the second four-way valve (3) are respectively connected with an exhaust port of the compressor (1), and a second port (E1) of the first four-way valve (2) and a second port (E2) of the second four-way valve (3) are respectively connected with a first end of the second indoor heat exchanger (18); the third port (C1) of the first four-way valve (2) is connected with the first end of the second outdoor heat exchanger (7), and the third port (C2) of the second four-way valve (3) is connected with the first end of the first outdoor heat exchanger (6); a fourth port (S1) of the first four-way valve (2) and a fourth port (S2) of the second four-way valve (3) are respectively connected with an air suction port of the compressor (1).

8. The heat pump system according to claim 7, wherein the valve assembly (01) further comprises: a second control valve (4) and a third control valve (5); the second control valve (4) is arranged in a pipeline between a second port (E1) of the first four-way valve (2) and a first end of the second indoor heat exchanger (18); the third control valve (5) is arranged in a pipeline between the second port (E2) of the second four-way valve (3) and the first end of the second indoor heat exchanger (18).

9. The heat pump system according to claim 8, further comprising two first throttling elements (16); a first end of one first throttling element (16) is communicated with an air suction port of the compressor (1), and a second end of the first throttling element is communicated with a pipeline between a second port (E1) of the first four-way valve (2) and the second control valve (4); a first end of the other first throttling element (16) is communicated with the air suction port of the compressor (1), and a second end of the other first throttling element is communicated with a pipeline between a second port (E2) of the second four-way valve (3) and the third control valve (5).

10. The heat pump system according to claim 1, further comprising an indoor side fan (19), wherein the indoor side fan (19), the first indoor heat exchanger (17) and the second indoor heat exchanger (18) are located in the same air duct, and indoor side return air generated by the indoor side fan (19) sequentially passes through the second indoor heat exchanger (18) and the first indoor heat exchanger (17).

11. The heat pump system according to claim 2, further comprising a second throttling element (21) and a one-way valve (22), wherein the second throttling element (21) is arranged in the path of the second end of the first indoor heat exchanger (17) and the liquid inlet of the one-way valve (22), and the liquid outlet of the one-way valve (22) is connected with the second end of the second indoor heat exchanger (18).

12. The heat pump system of claim 1, further comprising:

a first shutoff valve (12) provided in a passage between a second end of the outdoor heat exchanger (02) and the first end of the first indoor heat exchanger (17) and the second indoor heat exchanger (18);

and a second stop valve (13) provided in a passage between the valve assembly (01) and the first end of the second indoor heat exchanger (18).

13. The heat pump system according to claim 1, comprising an indoor unit (200) and an outdoor unit (100), the indoor unit (200) comprising the first indoor heat exchanger (17) and the second indoor heat exchanger (18), the outdoor unit (100) comprising the compressor (1), the outdoor heat exchanger (02) and the valve assembly (01).

14. A control method of a heat pump system, applied to control the heat pump system according to any one of claims 1 to 13, comprising:

Determining an operation mode of the heat pump system;

-controlling the actions of the valve assembly (01) and the first control valve (15) in the heat pump system according to a preset control strategy and based on the operating mode.

15. The method of claim 14, further comprising:

when the operation mode is a dehumidification reheating mode or a first heating mode, controlling the action of the first control valve (15) so that the first indoor heat exchanger (17) is used for reheating air;

when the operation mode is a cooling/dehumidifying mode, a defrosting mode or a second heating mode, the operation of the first control valve (15) is controlled to stop the reheating of the air by the first indoor heat exchanger (17).

16. A control method of a heat pump system, applied to control the heat pump system according to any one of claims 4 to 9, comprising:

determining an operation mode of the heat pump system;

controlling the actions of a valve assembly (01) and the first control valve (15) in the heat pump system according to a preset control strategy and based on the operation mode;

wherein the operation mode includes: at least one of a cooling/dehumidifying mode, a first dehumidifying and reheating mode, a second dehumidifying and reheating mode, a third dehumidifying and reheating mode, a first heating mode, a second heating mode, a first defrosting mode and a second defrosting mode.

17. The method of claim 16, further comprising:

when the operation mode is a second dehumidification reheating mode, the first control valve (15) is controlled to be conducted, the exhaust port of the compressor (1) is controlled to be communicated with the first end of the first outdoor heat exchanger (6), and the air suction port of the compressor (1) is controlled to be respectively communicated with the first end of the second outdoor heat exchanger (7) and the first end of the second indoor heat exchanger (18);

when the operation mode is a third dehumidification reheating mode, the first control valve (15) is controlled to be conducted, the exhaust port of the compressor (1) is controlled to be communicated with the first end of the second outdoor heat exchanger (7), and the air suction port of the compressor (1) is controlled to be respectively communicated with the first end of the first outdoor heat exchanger (6) and the first end of the second indoor heat exchanger (18).

18. The method of claim 17, further comprising:

and when the running mode is a second dehumidification reheating mode state and the indoor humidity is reduced to the preset humidity and the indoor temperature is smaller than the preset temperature, reducing the heat exchange amount of the first outdoor heat exchanger (6).

19. The method of claim 18, further comprising:

and after the preset time, if the indoor temperature is still smaller than the preset temperature, the working frequency of the compressor (1) and the heat exchange amount of the second outdoor heat exchanger (7) are increased.

20. A control device of a heat pump system, comprising:

a memory; and

a processor coupled to the memory and configured to perform the method of any of claims 14-19 based on instructions stored in the memory.

21. An air conditioning apparatus comprising the heat pump system according to any one of claims 1 to 13, and the control device of the heat pump system according to claim 20.

22. A computer readable storage medium having stored thereon computer instructions for execution by a processor of the method of any of claims 14 to 19.