CN112556233B

CN112556233B - Heat pump system, control method and control device thereof, air conditioning equipment and storage medium

Info

Publication number: CN112556233B
Application number: CN202011529988.2A
Authority: CN
Inventors: 尤文超; 杨智峰; 戴永福
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2024-03-15
Anticipated expiration: 2040-12-22
Also published as: CN112556233A

Abstract

The invention relates to a heat pump system, a control method, a control device, air conditioning equipment and a storage medium thereof, wherein the heat pump system comprises a compressor (1), a first indoor heat exchanger (22), a second indoor heat exchanger (23), an outdoor heat exchanger (30) and a valve assembly (40), the valve assembly (40) is connected with an exhaust port and an air suction port of the compressor (1), the first indoor heat exchanger (22), the second indoor heat exchanger (23) and the outdoor heat exchanger (30), and the valve assembly (40) is configured to control the flow direction of a refrigerant and/or the on-off of a connecting pipeline so as to realize the switching of the heat pump system between different working modes; wherein the operating modes include a cooling mode, a heating mode, and a dehumidifying and reheating mode in which the valve assembly (40) is configured to communicate the discharge port of the compressor (1) with the first interface of the first indoor heat exchanger (22) such that the first indoor heat exchanger (22) functions as a condenser.

Description

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

Technical Field

The present invention relates to the field of air conditioning apparatuses, and in particular, to a heat pump system, a control method and a control device thereof, an air conditioning apparatus, and a storage medium.

Background

At present, in order to improve the comfort level of the environment where people are located, a constant temperature and humidity machine is adopted to control the temperature and the humidity in the environment. Most of the constant temperature and humidity machines need to be provided with an electric heating device, for example, when the indoor humidity is greater than the set humidity and the indoor temperature is less than or equal to the set temperature, the indoor temperature needs to be increased by using the electric heating device in order to avoid the indoor temperature being too low; for another example, when the indoor temperature is less than the set temperature, the indoor temperature needs to be raised, but when the outdoor heat exchanger is frosted, a part of high-temperature and high-pressure refrigerant in the heat pump system needs to be used for defrosting, which reduces the heat exchange capacity of the heat exchanger in the heat pump system, thereby reducing the heating capacity and causing fluctuation of the indoor temperature, and at the moment, the indoor temperature needs to be regulated by using an electric heating device.

The electric heating device can meet the indoor temperature regulation requirement, but can increase the power consumption and reduce the energy efficiency.

It should be noted that the information disclosed in the background section of the present invention is only for increasing the understanding of the general background of the present invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The embodiment of the invention provides a heat pump system, a control method and a control device thereof, air conditioning equipment and a storage medium, and improves the heat exchange performance of the heat pump system.

According to a first aspect of the present invention, there is provided a heat pump system comprising:

a compressor;

a first indoor heat exchanger;

a second indoor heat exchanger;

an outdoor heat exchanger; and

the valve component is connected with the exhaust port and the air suction port of the compressor, the first indoor heat exchanger, the second indoor heat exchanger and the outdoor heat exchanger, and is configured to control the flow direction of a refrigerant and/or the on-off of a connecting pipeline so as to realize the switching of the heat pump system among different working modes;

the working modes comprise a refrigeration mode, a heating mode and a dehumidifying and reheating mode, and in the dehumidifying and reheating mode, the valve assembly is configured to communicate an exhaust port of the compressor with a first interface of the first indoor heat exchanger, so that the first indoor heat exchanger is used as a condenser.

In some embodiments, the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger, and the valve assembly is further configured to cause at least one of the first outdoor heat exchanger and the second outdoor heat exchanger to function as a condenser or cause neither of the first outdoor heat exchanger and the second outdoor heat exchanger to function in the dehumidified reheat mode.

In some embodiments, the dehumidified reheat mode includes a first dehumidified reheat mode, in which both the first and second outdoor heat exchangers function as condensers, a second dehumidified reheat mode, a third dehumidified reheat mode, and a fourth dehumidified reheat mode; in the second dehumidification reheat mode, the first outdoor heat exchanger functions as a condenser, and the second outdoor heat exchanger is in a closed state or functions as an evaporator; in the third dehumidification reheat mode, the second outdoor heat exchanger is used as a condenser, and the first outdoor heat exchanger is in a closed state or is used as an evaporator; in the fourth dehumidification reheat mode, neither the first nor the second outdoor heat exchanger operates; the valve assembly is configured to enable the heat pump system to switch between a first dehumidified reheat mode, a second dehumidified reheat mode, a third dehumidified reheat mode, and a fourth dehumidified reheat mode.

In some embodiments, the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger, the mode of operation comprises a defrost mode in which the valve assembly is configured such that one of the first outdoor heat exchanger and the second outdoor heat exchanger acts as a condenser and the other of the first outdoor heat exchanger and the second outdoor heat exchanger acts as an evaporator.

In some embodiments, the defrosting mode includes a first defrosting mode in which the first outdoor heat exchanger functions as a condenser and a second defrosting mode as an evaporator; in the second defrosting mode, the first outdoor heat exchanger serves as an evaporator, and the second outdoor heat exchanger serves as a condenser; the valve assembly is configured to enable the heat pump system to switch between a first defrost mode and a second defrost mode.

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

In some embodiments, the heat pump system 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 side 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 outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger, the valve assembly comprises a first four-way valve and a second four-way valve, the first port of the first four-way valve is communicated with the exhaust port of the compressor, the second port of the first four-way valve is communicated with the first port of the first outdoor heat exchanger, the third port and the fourth port of the first four-way valve are both communicated with the air suction port of the compressor, the first port of the second four-way valve is communicated with the exhaust port of the compressor, the second port of the second four-way valve is communicated with the first port of the second outdoor heat exchanger, and the third port and the fourth port of the second four-way valve are both communicated with the air suction port of the compressor.

In some embodiments, the valve assembly further comprises a first throttling element connected between the fourth port of the first four-way valve and the suction port of the compressor.

In some embodiments, the valve assembly further comprises a second throttling element connected between the fourth port of the second four-way valve and the suction port of the compressor.

In some embodiments, the valve assembly further comprises a control valve disposed on a connection line between the discharge port of the compressor and the first port of the first indoor heat exchanger.

In some embodiments, the heat pump system further comprises an outdoor unit including a compressor, an outdoor heat exchanger including a first outdoor heat exchanger and a second outdoor heat exchanger, a valve assembly, a first expansion valve connected between a second port of the first outdoor heat exchanger and a first port of the outdoor unit, and a second expansion valve connected between a second port of the second outdoor heat exchanger and a first port of the outdoor unit.

In some embodiments, the heat pump system further comprises an indoor unit comprising a first indoor heat exchanger, a second indoor heat exchanger, a third expansion valve and a fourth expansion valve, the third expansion valve is connected between the second interface of the first indoor heat exchanger and the first interface of the indoor unit, the fourth expansion valve is connected between the first interface of the second indoor heat exchanger and the first interface of the indoor unit, and the first interface of the indoor unit is communicated with the first interface of the outdoor unit.

According to a second aspect of the present invention, there is provided a control method of a heat pump system, applied to control the heat pump system described above, comprising:

determining a working mode of a heat pump system, wherein the working mode comprises a refrigeration mode, a heating mode and a dehumidifying and reheating mode;

and controlling the action of a valve assembly in the heat pump system according to a preset control strategy and based on the working mode.

According to a third aspect of the present invention, there is provided a control method of a heat pump system, applied to control the heat pump system described above, comprising:

and controlling the actions of the first four-way valve, the second four-way valve and the control valve in the heat pump system according to a preset control strategy and based on the working mode.

In some embodiments, the control method includes:

when the working mode is a first dehumidification reheating mode, a first port of the first four-way valve is controlled to be communicated with a second port, a third port of the first four-way valve is controlled to be communicated with a fourth port, the first port of the second four-way valve is controlled to be communicated with the second port, and the third port of the second four-way valve is controlled to be communicated with the fourth port; the control valve is controlled to be in a conducting state.

In some embodiments, the control method includes:

When the working mode is a second dehumidification reheating mode, a first port of the first four-way valve is controlled to be communicated with a second port, a third port of the first four-way valve is controlled to be communicated with a fourth port, and the first port of the second four-way valve is controlled to be communicated with the fourth port, and the second port of the second four-way valve is controlled to be communicated with the third port; the control valve is controlled to be in a conducting state.

In some embodiments, the control method includes:

when the working mode is the second dehumidification reheating mode, the first outdoor heat exchanger is controlled to be in a closed state; or,

when the working mode is the second dehumidification reheating mode, the first outdoor heat exchanger is controlled to enter the working state and used as an evaporator; and

and when the indoor humidity is reduced to the preset humidity and the indoor temperature is smaller than the preset temperature, the working frequency of the compressor is increased.

In some embodiments, the control method includes:

when the working mode is a third dehumidification reheating mode, a first port of the first four-way valve is controlled to be communicated with a fourth port, a second port of the first four-way valve is controlled to be communicated with a third port, the first port of the second four-way valve is controlled to be communicated with the second port, and the third port of the second four-way valve is controlled to be communicated with the fourth port; the control valve is controlled to be in a cut-off state.

In some embodiments, the control method includes:

when the working mode is a third dehumidification reheating mode, the second outdoor heat exchanger is controlled to be in a closed state; or,

When the working mode is a third dehumidification reheating mode, the second outdoor heat exchanger is controlled to enter the working state and used as an evaporator; and

In some embodiments, the control method includes:

when the working mode is a fourth dehumidification reheating mode, a first port of the first four-way valve is controlled to be communicated with a fourth port, a second port of the first four-way valve is controlled to be communicated with a third port, the first port of the second four-way valve is controlled to be communicated with the fourth port, and the second port of the second four-way valve is controlled to be communicated with the third port; the control valve is controlled to be in a cut-off state.

In some embodiments, the control method includes:

when the working mode is a fourth dehumidification reheating mode, the first outdoor heat exchanger and the second outdoor heat exchanger are controlled to be in a closed state; or,

when the working mode is a fourth dehumidification reheating mode, the first outdoor heat exchanger and the second outdoor heat exchanger are controlled to enter the working state and serve as evaporators; and

According to a fourth aspect of the present invention, there is provided a control device of a heat pump system comprising a memory and a processor coupled to the memory, the processor being configured to perform the above-described control method, or to perform the above-described control method, based on instructions stored in the memory.

According to a fifth aspect of the present invention, there is provided an air conditioning apparatus comprising the heat pump system described above and/or a control device of the heat pump system described above.

According to a sixth aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for execution by a processor or for execution by the control method described above.

Based on the technical scheme, the embodiment of the invention controls the flow direction of the refrigerant and/or the on-off of the connecting pipeline through the valve component, can realize the switching of the heat pump system among a refrigerating mode, a heating mode and a dehumidifying and reheating mode, and can enable the exhaust port of the compressor to be communicated with the first interface of the first indoor heat exchanger through the valve component in the dehumidifying and heating mode, namely the first indoor heat exchanger is used as a condenser, so that the indoor environment is heated through the first indoor heat exchanger, the indoor temperature is prevented from being reduced too much due to dehumidification, the heat exchange performance of the heat pump system is improved, the use of an electric heating device is reduced, the power consumption is reduced, and the energy efficiency is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

Fig. 1 is a schematic structural diagram of an embodiment of a heat pump system according to the present invention.

Fig. 2 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention in a cooling mode.

Fig. 3 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention in a first dehumidifying and reheating mode.

Fig. 4 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention in the second dehumidifying and reheating mode.

Fig. 5 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention in a third dehumidification reheat mode.

Fig. 6 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention in a fourth dehumidification reheat mode.

Fig. 7 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention in a heating mode.

Fig. 8 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention in a first defrosting mode.

Fig. 9 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention in the second defrosting mode.

In the figure:

100. an outdoor unit; 200. an indoor unit;

1. a compressor; 2. a first four-way valve; 3. a second four-way valve; 4. a control valve; 5. a first outdoor heat exchanger; 6. a second outdoor heat exchanger; 7. a first outdoor fan; 8. a second outdoor fan; 9. a first throttling element; 10. a second throttling element; 11. a first expansion valve; 12. a second expansion valve; 13. a liquid storage tank; 14. a first stop valve; 15. a second shut-off valve; 16. a third stop valve; 17. a fourth shut-off valve; 18. a fifth shut-off valve; 19. a sixth shut-off valve; 20. a third expansion valve; 21. a fourth expansion valve; 22. a first indoor heat exchanger; 23. a second indoor heat exchanger; 24. an indoor fan; 25. a first connector; 26. a second connector; 27. a third connecting member; 28. a fourth connecting member; 30. an outdoor heat exchanger; 40. a valve assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.

Referring to fig. 1, in some embodiments of a heat pump system provided by the present invention, the heat pump system includes a compressor 1, a first indoor heat exchanger 22, a second indoor heat exchanger 23, an outdoor heat exchanger 30, and a valve assembly 40, where the valve assembly 40 is connected to an exhaust port and an intake port of the compressor 1, the first indoor heat exchanger 22, the second indoor heat exchanger 23, and the outdoor heat exchanger 30, and the valve assembly 40 is configured to control flow direction of a refrigerant and/or on-off of a connection pipeline, so as to implement switching of the heat pump system between different operation modes. Wherein the operation modes include a cooling mode, a heating mode, and a dehumidifying and reheating mode in which the valve assembly 40 is configured to communicate the discharge port of the compressor 1 with the first interface of the first indoor heat exchanger 22 such that the first indoor heat exchanger 22 functions as a condenser.

In the above embodiment, the valve assembly 40 controls the flow direction of the refrigerant and/or the connection and disconnection of the connecting pipeline, so that the heat pump system can be switched among the refrigerating mode, the heating mode and the dehumidifying and reheating mode, and different requirements of users in different seasons can be met. In addition, in the dehumidification and heating mode, the exhaust port of the compressor 1 can be communicated with the first interface of the first indoor heat exchanger 22 through the valve assembly 40, namely, the first indoor heat exchanger 22 is used as a condenser, so that the indoor environment is heated through the first indoor heat exchanger 22, the indoor temperature is prevented from being reduced too much due to dehumidification, the heat exchange performance of the heat pump system is improved, the use of an electric heating device can be reduced, the power consumption is reduced, and the energy efficiency is improved.

In the above embodiment, when the first indoor heat exchanger 22 is used as a condenser, the first port of the first indoor heat exchanger 22 is directly connected to the exhaust port of the compressor 1, so that a part of the exhaust gas of the compressor 1 can be directly introduced into the room to reheat the indoor environment, and the reheat efficiency is high.

In some embodiments, the outdoor heat exchanger 30 includes a first outdoor heat exchanger 5 and a second outdoor heat exchanger 6, and the valve assembly 40 is further configured to cause at least one of the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 to function as a condenser or cause neither of the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 to operate in the dehumidified reheat mode.

In some embodiments, by controlling the valve assembly 40, in the dehumidification and reheating mode, two heat exchangers arranged outdoors can be simultaneously in an operating state and used as condensers, and at this time, the operating frequency of the compressor 1 is higher, and the lubricating oil in the compressor 1 can smoothly circulate along with the refrigerant; two heat exchangers arranged outdoors may also be one in operation and used as a condenser and the other in a closed state or in operation and used as an evaporator; the two heat exchangers arranged outdoors can also be both inoperative, i.e. in an inoperative state.

When both of the heat exchangers provided outdoors are used as condensers, the first indoor heat exchanger 22 as a condenser has a small amount of refrigerant that can be distributed, and has a low temperature raising capability. In the embodiment in which one of the two heat exchangers disposed outdoors is in an operating state and the other is in an operating state and is used as a condenser, the amount of the refrigerant that can be distributed as the first indoor heat exchanger 22 of the condenser is increased, and the temperature rising capability is also improved; further, since the first indoor heat exchanger 22 disposed in the room serves as a condenser and the second indoor heat exchanger 23 serves as an evaporator in the dehumidification reheat mode, better split flow can be achieved for the indoor and outdoor heat exchangers as a whole, and after the frequency of the compressor 1 is increased in order to increase the reheat capacity of the first indoor heat exchanger 22 in the room, the indoor environment can be adjusted to a proper temperature and humidity by dynamic split flow between the second indoor heat exchanger 23 and the outdoor heat exchanger serving as an evaporator. When both of the heat exchangers provided outdoors are not operated, the amount of refrigerant that can be distributed by the first indoor heat exchanger 22 as a condenser is maximized, and the temperature rising capability is maximized.

In some embodiments, the dehumidified reheat mode includes a first dehumidified reheat mode, in which both the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 function as condensers, a second dehumidified reheat mode, a third dehumidified reheat mode, and a fourth dehumidified reheat mode; in the second dehumidification reheat mode, the first outdoor heat exchanger 5 functions as a condenser, and the second outdoor heat exchanger 6 is in a closed state or functions as an evaporator; in the third dehumidification reheat mode, the second outdoor heat exchanger 6 functions as a condenser, and the first outdoor heat exchanger 5 is in a closed state or functions as an evaporator; in the fourth dehumidification reheat mode, neither the first outdoor heat exchanger 5 nor the second outdoor heat exchanger 6 operates; the valve assembly 40 is configured to enable the heat pump system to switch between a first dehumidified reheat mode, a second dehumidified reheat mode, a third dehumidified reheat mode, and a fourth dehumidified reheat mode.

As shown in fig. 3, in the first dehumidifying and reheating mode, the first outdoor heat exchanger 5, the second outdoor heat exchanger 6 and the first indoor heat exchanger 22 are all used as condensers, the second indoor heat exchanger 23 is used as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 23, and the indoor environment can be reheated by the first indoor heat exchanger 22, so that the indoor environment is prevented from being excessively low in temperature in order to meet the dehumidification requirement.

As shown in fig. 4, in the second dehumidifying and reheating mode, the first outdoor heat exchanger 5 is in the off state, the second outdoor heat exchanger 6 and the first indoor heat exchanger 22 both function as condensers, the second indoor heat exchanger 23 functions as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 23, and the indoor environment can be reheated by the first indoor heat exchanger 22, preventing the temperature of the indoor environment from being excessively low in order to satisfy the dehumidification requirement.

In other embodiments, in the second dehumidifying and reheating mode, the first outdoor heat exchanger 5 may be in an operating state and serve as an evaporator, and both the second outdoor heat exchanger 6 and the first indoor heat exchanger 22 serve as condensers, and the second indoor heat exchanger 23 serves as an evaporator, and the indoor environment is cooled and dehumidified by the second indoor heat exchanger 23, and the indoor environment may be reheated by the first indoor heat exchanger 22, so that the indoor environment is prevented from being excessively low in temperature in order to meet the dehumidification requirement. Meanwhile, by using the first outdoor heat exchanger 5 as an evaporator, when the indoor humidity reaches the preset requirement and the indoor temperature is still lower and cannot meet the preset requirement, the reheating capacity of the first indoor heat exchanger 22 can be improved by improving the frequency of the compressor 1, and meanwhile, the refrigerant in the second indoor heat exchanger 23 can be shunted into the first outdoor heat exchanger 5, so that the excessive dehumidification of the indoor environment caused by the improvement of the frequency of the compressor 1 is avoided, and the refrigerating and heating capacities of the heat pump system are dynamically balanced.

As shown in fig. 5, in the third dehumidification reheat mode, the second outdoor heat exchanger 6 is in the off state, the first outdoor heat exchanger 5 and the first indoor heat exchanger 22 both function as condensers, the second indoor heat exchanger 23 functions as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 23, and the indoor environment can be reheated by the first indoor heat exchanger 22, preventing the temperature of the indoor environment from being excessively low in order to satisfy the dehumidification requirement.

In other embodiments, in the third dehumidifying and reheating mode, the second outdoor heat exchanger 6 may be in an operating state and serve as an evaporator, and the first outdoor heat exchanger 5 and the first indoor heat exchanger 22 both serve as condensers, and the second indoor heat exchanger 23 serves as an evaporator, so that the indoor environment is cooled and dehumidified by the second indoor heat exchanger 23, and the indoor environment is reheated by the first indoor heat exchanger 22, so that the indoor environment is prevented from being excessively low in temperature to meet the dehumidification requirement. Meanwhile, by using the second outdoor heat exchanger 6 as an evaporator, when the indoor humidity reaches the preset requirement and the indoor temperature is still lower and cannot meet the preset requirement, the reheating capacity of the first indoor heat exchanger 22 can be improved by improving the frequency of the compressor 1, and meanwhile, the refrigerant in the second indoor heat exchanger 23 can be shunted into the second outdoor heat exchanger 6, so that the excessive dehumidification of the indoor environment caused by the improvement of the frequency of the compressor 1 is avoided, and the refrigerating and heating capacities of the heat pump system are dynamically balanced.

As shown in fig. 6, in the fourth dehumidification reheat mode, the first and second outdoor heat exchangers 5 and 6 are in the closed state, the first indoor heat exchanger 22 serves as a condenser, the second indoor heat exchanger 23 serves as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 23, and the indoor environment is reheated by the first indoor heat exchanger 22, preventing the temperature of the indoor environment from being excessively low in order to satisfy the dehumidification requirement.

In some embodiments, the outdoor heat exchanger 30 includes the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6, and the operating mode includes a defrost mode in which the valve assembly 40 is configured such that one of the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 functions as a condenser and the other of the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 functions as an evaporator.

When the indoor and outdoor environment temperature is low and the heat pump system is needed to be used for heating, the outdoor heat exchanger can rapidly convey the absorbed heat to the indoor, so that the frosting phenomenon easily occurs on the outer surface of the outdoor heat exchanger. In some of the above embodiments, by controlling the valve assembly 40, one of the first and second outdoor heat exchangers 5 and 6 may be made to function as a condenser to melt frost condensed on the outer surface of the other of the first and second outdoor heat exchangers 5 and 6 by heat released from the condenser.

In some embodiments, by controlling the valve assembly 40, switching of the cooling mode, heating mode, dehumidifying and reheating mode and defrosting mode can be achieved, so that the heat pump system can adapt to more working conditions and meet more requirements.

In some embodiments, the defrosting mode includes a first defrosting mode in which the first outdoor heat exchanger 5 functions as a condenser and a second defrosting mode in which the second outdoor heat exchanger 6 functions as an evaporator; in the second defrosting mode, the first outdoor heat exchanger 5 functions as an evaporator, and the second outdoor heat exchanger 6 functions as a condenser; the valve assembly 40 is configured to enable the heat pump system to switch between a first defrost mode and a second defrost mode.

By alternating the two defrosting modes, defrosting operations can be performed on the two outdoor heat exchangers respectively. 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.

In some embodiments, the heat pump system further comprises a first outdoor fan 7 and a second outdoor fan 8, the first outdoor fan 7 and the first outdoor heat exchanger 5 are located in a first air duct, the second outdoor fan 8 and the second outdoor heat exchanger 6 are located in a second air duct, and the first air duct and the second air duct are independently arranged.

In some embodiments, the heat pump system further includes an indoor fan 24, where the indoor fan 24, the first indoor heat exchanger 22 and the second indoor heat exchanger 23 are located in the same air duct, and indoor return air generated by the indoor fan 24 sequentially passes through the second indoor heat exchanger 23 and the first indoor heat exchanger 22.

The second indoor heat exchanger 23 is disposed upstream of the first indoor heat exchanger 22 such that the indoor return air passes through the second indoor heat exchanger 23 before passing through the first indoor heat exchanger 22 by the indoor fan 24. The advantage of this arrangement is that when the heat pump system is in the dehumidification reheat mode, the first indoor heat exchanger 22 acts as a condenser and the second indoor heat exchanger 23 acts as an evaporator, so that heat released by the condenser can be prevented from being directly absorbed by the evaporator, and the energy efficiency of the indoor heat exchanger can be improved.

In some embodiments, the outdoor heat exchanger 30 includes a first outdoor heat exchanger 5 and a second outdoor heat exchanger 6, the valve assembly 40 includes a first four-way valve 2 and a second four-way valve 3, a first port of the first four-way valve 2 communicates with the exhaust port of the compressor 1, a second port of the first four-way valve 2 communicates with the first port of the first outdoor heat exchanger 5, a third port and a fourth port of the first four-way valve 2 each communicate with the intake port of the compressor 1, a first port of the second four-way valve 3 communicates with the exhaust port of the compressor 1, a second port of the second four-way valve 3 communicates with the first port of the second outdoor heat exchanger 6, and a third port and a fourth port of the second four-way valve 3 each communicate with the intake port of the compressor 1.

The first port D1 of the first four-way valve 2 is disposed between the second port C1 and the fourth port E1 of the first four-way valve 2, and the second port C1 of the first four-way valve 2 is disposed between the first port D1 and the third port S1 of the first four-way valve 2.

When the first four-way valve 2 is powered on, the first port D1 is communicated with the fourth port E1, and the second port C1 is communicated with the third port S1; when the first four-way valve 2 is powered down, the first port D1 is communicated with the second port C1, and the third port S1 is communicated with the fourth port E1.

The first port D2 of the second four-way valve 3 is disposed between the second port C2 and the fourth port E2 of the second four-way valve 3, and the second port C2 of the second four-way valve 3 is disposed between the first port D2 and the third port S2 of the second four-way valve 3.

When the second four-way valve 3 is powered on, the first port D2 is communicated with the fourth port E2, and the second port C2 is communicated with the third port S2; when the second four-way valve 3 is powered down, the first port D2 is communicated with the second port C2, and the third port S2 is communicated with the fourth port E2.

In some embodiments, the valve assembly 40 further includes a first throttling element 9, the first throttling element 9 being connected between the fourth port E1 of the first four-way valve 2 and the suction port of the compressor 1.

By arranging the first throttling element 9 between the fourth port E1 of the first four-way valve 2 and the air suction port of the compressor 1, liquid refrigerant on a connecting pipeline between the air discharge port of the compressor 1 and the first four-way valve 2 and on an internal connecting pipeline of the first four-way valve 2 can be timely discharged after the reversing of the first four-way valve 2, so that the problem of liquid impact is avoided.

In some embodiments, the valve assembly 40 further includes a second throttling element 10, the second throttling element 10 being connected between the fourth port E2 of the second four-way valve 3 and the suction port of the compressor 1.

By arranging the second throttling element 10 between the fourth port E2 of the second four-way valve 3 and the air suction port of the compressor 1, liquid refrigerant on a connecting pipeline between the air discharge port of the compressor 1 and the second four-way valve 3 and on an internal connecting pipeline of the second four-way valve 3 can be timely discharged after the second four-way valve 3 is reversed, so that the problem of liquid impact is avoided.

In some embodiments, the first throttling element 9 and the second throttling element 10 may be capillaries.

In some embodiments, the valve assembly 40 further includes a control valve 4, the control valve 4 being disposed on a connection line between the discharge port of the compressor 1 and the first port of the first indoor heat exchanger 22. The control valve 4 may employ an on-off valve for connecting or shutting off a connection line between the discharge port of the compressor 1 and the first port of the first indoor heat exchanger 22.

In some embodiments, the heat pump system further includes an outdoor unit 100, the outdoor unit 100 includes a compressor 1, an outdoor heat exchanger 30, a valve assembly 40, a first expansion valve 11 and a second expansion valve 12, the outdoor heat exchanger 30 includes a first outdoor heat exchanger 5 and a second outdoor heat exchanger 6, the first expansion valve 11 is connected between a second interface of the first outdoor heat exchanger 5 and a first interface of the outdoor unit 100, and the second expansion valve 12 is connected between a second interface of the second outdoor heat exchanger 6 and a first interface of the outdoor unit 100.

In some embodiments, the heat pump system further includes an indoor unit 200, the indoor unit 200 includes a first indoor heat exchanger 22, a second indoor heat exchanger 23, a third expansion valve 20 and a fourth expansion valve 21, the third expansion valve 20 is connected between a second interface of the first indoor heat exchanger 22 and a first interface of the indoor unit 200, the fourth expansion valve 21 is connected between a first interface of the second indoor heat exchanger 23 and a first interface of the indoor unit 200, and the first interface of the indoor unit 200 is in communication with the first interface of the outdoor unit 100.

The operation of one embodiment of the heat pump system of the present invention will be described below based on fig. 1 to 9:

as shown in fig. 1, the heat pump system includes an outdoor unit 100 and an indoor unit 200. The outdoor unit 100 includes a compressor 1, an outdoor heat exchanger 30, and a valve assembly 40, and the indoor unit 200 includes a first indoor heat exchanger 22 and a second indoor heat exchanger 23.

As shown in fig. 2 to 9, the outdoor heat exchanger 30 includes a first outdoor heat exchanger 5 and a second outdoor heat exchanger 6. The valve assembly 40 includes a first four-way valve 2, a second four-way valve 3, and a control valve 4.

The heat pump system further comprises a first outdoor fan 7, a second outdoor fan 8, a first throttling element 9, a second throttling element 10, a first expansion valve 11, a second expansion valve 12, a liquid storage tank 13, a first shut-off valve 14, a second shut-off valve 15, a third shut-off valve 16, a fourth shut-off valve 17, a fifth shut-off valve 18, a sixth shut-off valve 19, a third expansion valve 20, a fourth expansion valve 21, an indoor fan 24, a first connection 25, a second connection 26, a third connection 27 and a fourth connection 28.

The first, second, third and fourth connectors 25, 26, 27 and 28 are all Y-tees. The control valve 4 can adopt a bidirectional ball valve, and a connecting pipeline where the control valve 4 is positioned can bear pressure in a bidirectional way and flow in a bidirectional way.

The first port of the first connecting member 25 communicates with the discharge port of the compressor 1, the second port of the first connecting member 25 communicates with the first port of the second connecting member 26, and the third port of the first connecting member 25 communicates with the first port of the control valve 4. The second port of the second connecting member 26 communicates with the first port D1 of the first four-way valve 2, and the third port of the second connecting member 25 communicates with the first port D2 of the second four-way valve 3.

The second port C1 of the first four-way valve 2 communicates with the first port of the first outdoor heat exchanger 5, the third port S1 of the first four-way valve 2 communicates with the third port of the third connecting member 27, the second port of the third connecting member 27 communicates with the third port S2 of the second four-way valve 3, and the first port of the third connecting member 27 communicates with the second port of the fourth connecting member 28. The fourth port E1 of the first four-way valve 2 communicates with the first end of the first throttling element 9, and the second end of the first throttling element 9 is connected to the connecting line between the first port of the fourth connecting member 27 and the second port of the fourth connecting member 28.

The second port C2 of the second four-way valve 3 communicates with the first port of the second outdoor heat exchanger 6, the third port S2 of the second four-way valve 3 communicates with the second port of the third connecting member 27, the fourth port E2 of the second four-way valve 3 communicates with the first end of the second throttling element 10, and the second end of the second throttling element 10 is connected to a connecting line between the first port of the fourth connecting member 27 and the second port of the fourth connecting member 28. The second port of the control valve 4 communicates with a second shut-off valve 15. The third port of the fourth connection 28 communicates with the third shut-off valve 16.

The first outdoor fan 7 and the first outdoor heat exchanger 5 are located in a first air channel, the second outdoor fan 8 and the second outdoor heat exchanger 6 are located in a second air channel, and the first air channel and the second air channel are independently arranged.

The first end of the first expansion valve 11 communicates with the second port of the first outdoor heat exchanger 5, and the second end of the first expansion valve 11 communicates with the liquid reservoir 13. The first end of the second expansion valve 12 communicates with the second port of the second outdoor heat exchanger 6, and the second end of the second expansion valve 12 communicates with the liquid reservoir 13.

A first stop valve 14 is provided between the liquid storage tank 13 and the first port of the outdoor unit 100, the first port of the indoor unit 200 is communicated with the first port of the outdoor unit 100, and a fourth stop valve 17 is provided between the first port of the indoor unit 200 and the second indoor heat exchanger 23.

The second stop valve 15 is disposed between the second port of the control valve 4 and the second port of the outdoor unit 100, the second port of the outdoor unit 100 is communicated with the second port of the indoor unit 200, and the fifth stop valve 18 is disposed between the second port of the indoor unit 200 and the first port of the first indoor heat exchanger 22.

The third stop valve 16 is disposed between the third port of the fourth connector 28 and the third port of the outdoor unit 100, the third port of the outdoor unit 100 is communicated with the third port of the indoor unit 200, and the sixth stop valve 19 is disposed between the third port of the indoor unit 200 and the second port of the second indoor heat exchanger 23.

The first end of the third expansion valve 20 communicates with the fourth shut-off valve 17 located in the indoor unit 200, and the second end of the third expansion valve 20 communicates with the second port of the first indoor heat exchanger 22. The first end of the fourth expansion valve 21 communicates with the fourth shut-off valve 17 located in the indoor unit 200, and the second end of the fourth expansion valve 21 communicates with the first port of the second indoor heat exchanger 23.

The indoor fan 24, the first indoor heat exchanger 22 and the second indoor heat exchanger 23 are positioned in the same air duct, and indoor side return air generated by the indoor fan 24 sequentially passes through the second indoor heat exchanger 23 and the first indoor heat exchanger 22.

In this embodiment, the heat pump system has a cooling mode, four dehumidification reheat modes, a heating mode, and two defrosting modes, for specific control modes, see tables 1 and 2 below.

TABLE 1 first correspondence table of operating modes and control states of respective components

TABLE 2 second correspondence table of operation modes and control states of respective components

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The connection relation of the components in each operation mode is described in detail as follows:

as shown in fig. 2, in the cooling mode, the first four-way valve 2 and the second four-way valve 3 are powered down, the control valve 4 is powered down, the indoor fan 24, the first outdoor fan 7 and the second outdoor fan 8 are all in operation states, the first expansion valve 11, the second expansion valve 12 and the fourth expansion valve 21 are all in open states, the third expansion valve 20 is in closed states, the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 are all used as condensers, the second indoor heat exchanger 23 is all used as evaporators, and the first indoor heat exchanger 22 is in closed states.

One path of refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the first four-way valve 2, the first outdoor heat exchanger 5 and the first expansion valve 11, and the other path of refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the second four-way valve 3, the second outdoor heat exchanger 6 and the second expansion valve 12. After flowing out of the liquid storage tank 13, the refrigerant entering the liquid storage tank 13 reaches the indoor unit 200 through the first stop valve 14 and the fourth stop valve 17, and then returns to the compressor 1 through the fourth expansion valve 21, the second indoor heat exchanger 23, the sixth stop valve 19, the third stop valve 16 and the fourth connecting piece 28.

The cooling mode is not limited to the mode shown in fig. 2, and either one of the first outdoor heat exchanger 5 or the second outdoor heat exchanger 6 may be turned off by adjusting the valve relationship of the first four-way valve 2 and the second four-way valve 3 as needed, thereby forming a cooling mode different from that shown in fig. 2.

The refrigerating modes in the embodiment of the invention simultaneously comprise a plurality of refrigerating modes, and can meet different requirements of users.

As shown in fig. 3, in the first dehumidifying and reheating mode, the first four-way valve 2 and the second four-way valve 3 are powered down, the control valve 4 is powered on, the indoor fan 24, the first outdoor fan 7 and the second outdoor fan 8 are all in an operating state, the first expansion valve 11, the second expansion valve 12, the third expansion valve 20 and the fourth expansion valve 21 are all in an open state, the first outdoor heat exchanger 5, the second outdoor heat exchanger 6 and the first indoor heat exchanger 22 are all used as condensers, and the second indoor heat exchanger 23 is used as an evaporator.

One path of refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the first four-way valve 2, the first outdoor heat exchanger 5 and the first expansion valve 11, and the other path of refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the second four-way valve 3, the second outdoor heat exchanger 6 and the second expansion valve 12. After flowing out of the liquid storage tank 13, the refrigerant introduced into the liquid storage tank 13 passes through the first shutoff valve 14 and the fourth shutoff valve 17 to reach the indoor unit 200. The other path of refrigerant discharged from the exhaust port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, then is merged with the refrigerant entering the indoor unit 200 from the liquid storage tank 13 through the first stop valve 14 and the fourth stop valve 17 through the third expansion valve 20, and then returns to the compressor 1 through the fourth expansion valve 21, the second indoor heat exchanger 23, the sixth stop valve 19, the third stop valve 16 and the fourth connecting piece 28.

In the indoor unit 200, the second indoor heat exchanger 23 is an evaporator, and can cool and dehumidify the indoor environment; the first indoor heat exchanger 22 is a condenser, and can release heat to the indoor space, so as to avoid the excessively low temperature of the indoor environment due to meeting the humidity requirement.

As shown in fig. 4, in the second dehumidifying and reheating mode, the first four-way valve 2 is powered down, the second four-way valve 3 is powered on, the control valve 4 is powered on, the indoor fan 24 and the first outdoor fan 7 are both in an operating state, the second outdoor fan 8 is in an operating or stopping state, the first expansion valve 11, the third expansion valve 20 and the fourth expansion valve 21 are all in an open state, the second expansion valve 12 is in an open or closed state, the first outdoor heat exchanger 5 and the first indoor heat exchanger 22 are both used as condensers, the second indoor heat exchanger 23 is used as an evaporator, and the second outdoor heat exchanger 6 can not participate in operation or be used as an evaporator. When the second outdoor heat exchanger 6 is used as an evaporator, the second outdoor heat exchanger 6 can split the flow of the low-pressure side in the heat pump system, so that the heat exchange amount of the second indoor heat exchanger 23 is kept unchanged, and the indoor humidity control stability is maintained.

When the second outdoor fan 8 is in a stop state and the second expansion valve 12 is in a closed state, the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the first four-way valve 2, the first outdoor heat exchanger 5 and the first expansion valve 11. After flowing out of the liquid storage tank 13, the refrigerant introduced into the liquid storage tank 13 passes through the first shutoff valve 14 and the fourth shutoff valve 17 to reach the indoor unit 200. The other path of refrigerant discharged from the exhaust port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, then is merged with the refrigerant entering the indoor unit 200 from the liquid storage tank 13 through the first stop valve 14 and the fourth stop valve 17 through the third expansion valve 20, and then returns to the compressor 1 through the fourth expansion valve 21, the second indoor heat exchanger 23, the sixth stop valve 19, the third stop valve 16 and the fourth connecting piece 28. Wherein the second outdoor heat exchanger 6 does not participate in the operation.

When the second outdoor fan 8 is in an operating state and the second expansion valve 12 is in an open state, the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the first four-way valve 2, the first outdoor heat exchanger 5 and the first expansion valve 11. After flowing out of the liquid storage tank 13, the refrigerant introduced into the liquid storage tank 13 passes through the first shutoff valve 14 and the fourth shutoff valve 17 to reach the indoor unit 200. The other path of refrigerant discharged from the exhaust port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, then is converged with refrigerant entering the indoor unit 200 from the liquid storage tank 13 through the first stop valve 14 and the fourth stop valve 17 through the third expansion valve 20, and then returns into the compressor 1 through the fourth expansion valve 21, the second indoor heat exchanger 23, the sixth stop valve 19, the third stop valve 16 and the fourth connecting piece 28; a part of the refrigerant passing through the third expansion valve 20 also flows in the reverse direction to the accumulator 13 through the fourth shut-off valve 17 and the first shut-off valve 14, and returns to the compressor 1 through the second expansion valve 12, the second outdoor heat exchanger 6, the second four-way valve 3, the third connecting member 27 and the fourth connecting member 28. The second outdoor heat exchanger 6 is used as an evaporator.

As shown in fig. 5, in the third dehumidification reheat mode, the first four-way valve 2 is powered on, the second four-way valve 3 is powered off, the control valve 4 is powered on, the indoor fan 24 and the second outdoor fan 8 are both in an operating state, the first outdoor fan 7 is in an operating or stop state, the second expansion valve 12, the third expansion valve 20 and the fourth expansion valve 21 are both in an open or closed state, the first expansion valve 11 is in an open or closed state, the second outdoor heat exchanger 6 and the first indoor heat exchanger 22 are both used as condensers, the second indoor heat exchanger 23 is used as an evaporator, and the first outdoor heat exchanger 5 can not participate in operation or be used as an evaporator. When the first outdoor heat exchanger 5 is used as an evaporator, the first outdoor heat exchanger 5 can split the flow of the low-pressure side in the heat pump system, so that the heat exchange amount of the second indoor heat exchanger 23 is kept unchanged, and the indoor humidity control stability is maintained.

When the first outdoor fan 7 is in a stop state and the first expansion valve 11 is in a closed state, the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the second four-way valve 3, the second outdoor heat exchanger 6 and the second expansion valve 12. After flowing out of the liquid storage tank 13, the refrigerant introduced into the liquid storage tank 13 passes through the first shutoff valve 14 and the fourth shutoff valve 17 to reach the indoor unit 200. The other path of refrigerant discharged from the exhaust port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, then is merged with the refrigerant entering the indoor unit 200 from the liquid storage tank 13 through the first stop valve 14 and the fourth stop valve 17 through the third expansion valve 20, and then returns to the compressor 1 through the fourth expansion valve 21, the second indoor heat exchanger 23, the sixth stop valve 19, the third stop valve 16 and the fourth connecting piece 28. Wherein the first outdoor heat exchanger 5 does not participate in the operation.

When the first outdoor fan 7 is in an operating state and the first expansion valve 11 is in an open state, a path of refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the second four-way valve 3, the second outdoor heat exchanger 6 and the second expansion valve 12. After flowing out of the liquid storage tank 13, the refrigerant introduced into the liquid storage tank 13 passes through the first shutoff valve 14 and the fourth shutoff valve 17 to reach the indoor unit 200. The other path of refrigerant discharged from the exhaust port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, then is converged with refrigerant entering the indoor unit 200 from the liquid storage tank 13 through the first stop valve 14 and the fourth stop valve 17 through the third expansion valve 20, and then returns into the compressor 1 through the fourth expansion valve 21, the second indoor heat exchanger 23, the sixth stop valve 19, the third stop valve 16 and the fourth connecting piece 28; a part of the refrigerant passing through the third expansion valve 20 also flows in the reverse direction to the accumulator 13 through the fourth shut-off valve 17 and the first shut-off valve 14, and returns to the compressor 1 through the first expansion valve 11, the first outdoor heat exchanger 5, the first four-way valve 2, the third connection member 27 and the fourth connection member 28. The first outdoor heat exchanger 5 is used as an evaporator.

As shown in fig. 6, in the fourth dehumidification reheat mode, the first four-way valve 2 and the second four-way valve 3 are both energized, the control valve 4 is energized, the indoor fan 24 is in an operating state, the first outdoor fan 7 and the second outdoor fan 8 are both in a stopped state, the third expansion valve 20 and the fourth expansion valve 21 are both in an opened state, the first expansion valve 11 and the second expansion valve 12 are in a closed state, the first indoor heat exchanger 22 is used as a condenser, the second indoor heat exchanger 23 is used as an evaporator, and the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 are both in a closed state.

The refrigerant discharged from the discharge port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, and then returns to the compressor 1 through the third expansion valve 20, the fourth expansion valve 21, the second indoor heat exchanger 23, the sixth stop valve 19, the third stop valve 16 and the fourth connecting member 28.

In the indoor unit 200, the second indoor heat exchanger 23 is an evaporator, and can cool and dehumidify the indoor environment; the first indoor heat exchanger 22 is a condenser, and can release heat to the indoor space, so as to avoid the excessively low temperature of the indoor environment due to meeting the humidity requirement. The two outdoor heat exchangers are in a stop working state, the cold quantity distribution of the two indoor heat exchangers is uniform, and the dehumidification and temperature control effects are good.

In the four dehumidification reheating modes, the dehumidification and reheating functions are realized through the mutual matching of the first indoor heat exchanger 22 and the second indoor heat exchanger 23, the second indoor heat exchanger 23 is responsible for dehumidification and cooling, as the indoor wet load and the cold load are unequal, the output of the heat pump system takes the large one of the wet load and the cold load as the adjusting basis, when the wet load is larger than the cold load, the indoor temperature overshoot (the current indoor environment temperature is lower than the set temperature) can be caused, and at the moment, the first indoor heat exchanger 22 intervenes in adjusting the cold load, namely, compensates and outputs excessive refrigerating capacity, so that the indoor temperature is matched with the set value.

As shown in fig. 7, in the heating mode, the first four-way valve 2 and the second four-way valve 3 are both powered on, the control valve 4 is powered on, the indoor fan 24, the first outdoor fan 7 and the second outdoor fan 8 are all in operation, the first expansion valve 11, the second expansion valve 12 and the third expansion valve 20 are all in open states, the fourth expansion valve 21 is in closed states, the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 are all used as evaporators, the first indoor heat exchanger 22 is used as a condenser, and the second indoor heat exchanger 23 is in closed states.

The refrigerant discharged from the exhaust port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, then enters the liquid storage tank 13 through the third expansion valve 20, the fourth stop valve 17 and the first stop valve 14, and after the refrigerant entering the liquid storage tank 13 flows out of the liquid storage tank 13, one path of refrigerant returns to the compressor 1 through the first expansion valve 11, the first outdoor heat exchanger 5, the first four-way valve 2, the third connecting piece 27 and the fourth connecting piece 28; the other path returns to the compressor 1 through the second expansion valve 12, the second outdoor heat exchanger 6, the second four-way valve 3, the third connecting member 27 and the fourth connecting member 28. The first indoor heat exchanger 22 is used as a condenser, and heats the indoor environment. The second indoor heat exchanger 23 is in a closed state.

In addition to the heating mode shown in fig. 7, the embodiment of the present invention can close either the first outdoor heat exchanger 5 or the second outdoor heat exchanger 6 by adjusting the valve relationship of the first four-way valve 2 and the second four-way valve 3 according to actual needs, thereby forming a heating mode different from that shown in fig. 7.

The refrigeration mode in the embodiment of the invention simultaneously comprises a plurality of heating modes, so that different requirements of users can be met.

As shown in fig. 8, in the first defrosting mode, the first four-way valve 2 is powered on, the second four-way valve 3 is powered off, the control valve 4 is powered on, the indoor fan 24, the first outdoor fan 7 and the second outdoor fan 8 are all in operation states, the first expansion valve 11, the second expansion valve 12 and the third expansion valve 20 are all in open states, the fourth expansion valve 21 is in a closed state, the second outdoor heat exchanger 6 and the first indoor heat exchanger 22 are all used as condensers, the second indoor heat exchanger 23 does not participate in operation, and the first outdoor heat exchanger 5 is used as an evaporator.

The refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the second four-way valve 3, the second outdoor heat exchanger 6 and the second expansion valve 12. The refrigerant discharged from the exhaust port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, and then enters the liquid storage tank 13 through the third expansion valve 20 and the fourth stop valve 17 and the first stop valve 14. The two paths of refrigerants are converged in the liquid storage tank 13, then flow out of the liquid storage tank 13, and then return to the compressor 1 through the first expansion valve 11, the first outdoor heat exchanger 5, the first four-way valve 2, the third connecting piece 27 and the fourth connecting piece 28.

As shown in fig. 9, in the second defrosting mode, the first four-way valve 2 is powered down, the second four-way valve 3 is powered on, the control valve 4 is powered on, the indoor fan 24, the first outdoor fan 7 and the second outdoor fan 8 are all in operation states, the first expansion valve 11, the second expansion valve 12 and the third expansion valve 20 are all in open states, the fourth expansion valve 21 is in a closed state, the first outdoor heat exchanger 5 and the first indoor heat exchanger 22 are all used as condensers, the second indoor heat exchanger 23 does not participate in operation, and the second outdoor heat exchanger 6 is used as an evaporator.

The refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 13 through the first connecting piece 25, the second connecting piece 26, the first four-way valve 2, the first outdoor heat exchanger 5 and the first expansion valve 11. The refrigerant discharged from the exhaust port of the compressor 1 enters the first indoor heat exchanger 22 through the control valve 4, the second stop valve 15 and the fifth stop valve 18, and then enters the liquid storage tank 13 through the third expansion valve 20, the fourth stop valve 17 and the first stop valve 14. The two paths of refrigerants are converged in the liquid storage tank 13, then flow out of the liquid storage tank 13, and then return to the compressor 1 through the second expansion valve 12, the second outdoor heat exchanger 6, the second four-way valve 3, the third connecting piece 27 and the fourth connecting piece 28.

In the outdoor unit 100, the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 alternately serve as an evaporator and a condenser, and heat discharged from the condenser can be used to melt frost formed by the evaporator due to heat absorption, thereby realizing asynchronous defrosting.

In one embodiment, when there is a cold load or a wet load in the room, the system first enters a cooling 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 in the first dehumidification reheat mode, if the wet load has reached the preset value but the heat load is not satisfied (the current indoor temperature is lower than the preset temperature), the number of steps of the third expansion valve 20 is opened to increase the heat exchange amount of the first indoor heat exchanger 22; if the heat exchange amount of the first indoor heat exchanger 22 is maximum (the heat exchange amount of the first outdoor heat exchanger 5 and the second outdoor heat exchanger 6 is reduced to the minimum), and the indoor heat load requirement is still not met (the current indoor temperature is lower than the preset temperature), entering a second dehumidification reheating mode or a third dehumidification reheating mode; the compressor 1 improves the capacity output, further increases the heat exchange amount of the first indoor heat exchanger 22, switches to the first outdoor heat exchanger 5 or the second outdoor heat exchanger 6 at the low pressure side, and divides the low pressure side flow of the multiple outputs of the compressor 1, so that the heat exchange amount of the second indoor heat exchanger 23 is kept unchanged, and the humidity control stability is maintained.

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 that whether defrosting is required for the corresponding outdoor side heat exchanger or not.

When the indoor temperature is smaller than the set temperature, the temperature needs to be raised, but the heat pump system has the problem that the outdoor heat exchanger frosts and frosts, so that the temperature fluctuation cannot meet the requirement, and the frosting is needed at the moment. 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.

Based on the heat pump system, the invention also provides a control method of the heat pump system, which is applied to control the heat pump system and comprises the following steps:

the action of the valve assembly 40 in the heat pump system is controlled according to a preset control strategy and based on the operating mode.

and controlling the actions of the first four-way valve 2, the second four-way valve 3 and the control valve 4 in the heat pump system according to a preset control strategy and based on the working mode.

In some embodiments, the control method includes:

when the working mode is a first dehumidification reheating mode, a first port of the first four-way valve 2 is controlled to be communicated with a second port, a third port of the first four-way valve 2 is controlled to be communicated with a fourth port, a first port of the second four-way valve 3 is controlled to be communicated with the second port, and the third port of the second four-way valve is controlled to be communicated with the fourth port; the control valve 4 is controlled to be in an on state.

In some embodiments, the control method includes:

when the working mode is the second dehumidification reheating mode, the first port and the second port of the first four-way valve 2 are controlled to be communicated, the third port and the fourth port of the first four-way valve 2 are controlled to be communicated, the first port and the fourth port of the second four-way valve 3 are controlled to be communicated, and the second port and the third port are controlled to be communicated; the control valve 4 is controlled to be in an on state.

In some embodiments, the control method includes:

When the working mode is the second dehumidification reheating mode, the first outdoor heat exchanger 5 is controlled to be in a closed state; or,

when the operation mode is the second dehumidification reheat mode, the first outdoor heat exchanger 5 is controlled to enter an operation state and serve as an evaporator; and

when the indoor humidity is reduced to the preset humidity and the indoor temperature is less than the preset temperature, the operating frequency of the compressor 1 is increased.

In some embodiments, the control method includes:

when the working mode is a third dehumidification reheating mode, the first port and the fourth port of the first four-way valve 2 are controlled to be communicated, the second port and the third port of the first four-way valve 2 are controlled to be communicated, the first port and the second port of the second four-way valve 3 are controlled to be communicated, and the third port and the fourth port of the second four-way valve 3 are controlled to be communicated; the control valve 4 is controlled to be in a closed state.

In some embodiments, the control method includes:

when the working mode is the third dehumidification reheating mode, the second outdoor heat exchanger 6 is controlled to be in a closed state; or,

when the operation mode is the third dehumidification reheat mode, the second outdoor heat exchanger 6 is controlled to enter an operation state and serve as an evaporator; and

In some embodiments, the control method includes:

when the working mode is a fourth dehumidification reheating mode, the first port and the fourth port of the first four-way valve 2 are controlled to be communicated, the second port and the third port of the first four-way valve 2 are controlled to be communicated, the first port and the fourth port of the second four-way valve 3 are controlled to be communicated, and the second port and the third port of the second four-way valve 3 are controlled to be communicated; the control valve 4 is controlled to be in a closed state.

In some embodiments, the control method includes:

when the working mode is a fourth dehumidification reheating mode, the first indoor heat exchanger 5 and the second outdoor heat exchanger 6 are controlled to be in a closed state; or,

when the operation mode is the fourth dehumidification reheating mode, the first indoor heat exchanger 5 and the second outdoor heat exchanger 6 are controlled to enter an operation state and serve as evaporators; and

The invention also provides a control device of the heat pump system, comprising a memory and a processor coupled to the memory, the processor being configured to execute a control method of the heat pump system based on instructions stored in the memory.

The invention also provides air conditioning equipment, which comprises the heat pump system and/or a control device of the heat pump system.

The invention also provides a computer readable storage medium storing computer instructions for execution by a processor of a method of controlling a heat pump system.

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.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications and equivalents of the features disclosed herein may be made to the specific embodiments of the invention or to parts of the features may be substituted without departing from the principles of the invention, and such modifications and equivalents are intended to be encompassed within the scope of the invention as claimed.

Claims

1. A heat pump system, comprising:

a compressor (1);

a first indoor heat exchanger (22);

a second indoor heat exchanger (23);

an outdoor heat exchanger (30); and

the valve assembly (40) is connected with the exhaust port and the air suction port of the compressor (1), the first indoor heat exchanger (22), the second indoor heat exchanger (23) and the outdoor heat exchanger (30), and the valve assembly (40) is configured to control the flow direction of a refrigerant and/or the on-off of a connecting pipeline so as to realize the switching of the heat pump system between different working modes;

wherein the operating modes include a cooling mode, a heating mode, and a dehumidifying and reheating mode in which the valve assembly (40) is configured to communicate a discharge port of the compressor (1) with a first interface of the first indoor heat exchanger (22) such that the first indoor heat exchanger (22) functions as a condenser and the second indoor heat exchanger (23) functions as an evaporator;

the outdoor heat exchanger (30) comprises a first outdoor heat exchanger (5) and a second outdoor heat exchanger (6), the valve assembly (40) being further configured in the dehumidified reheat mode to cause at least one of the first outdoor heat exchanger (5) and the second outdoor heat exchanger (6) to function as a condenser or to cause neither the first outdoor heat exchanger (5) nor the second outdoor heat exchanger (6) to operate;

The dehumidifying and reheating modes include a first dehumidifying and reheating mode, a second dehumidifying and reheating mode, a third dehumidifying and reheating mode and a fourth dehumidifying and reheating mode, wherein in the first dehumidifying and reheating mode, both the first outdoor heat exchanger (5) and the second outdoor heat exchanger (6) are used as condensers; in the second dehumidification reheat mode, the first outdoor heat exchanger (5) functions as a condenser, and the second outdoor heat exchanger (6) is in an off state or functions as an evaporator; in the third dehumidification reheat mode, the second outdoor heat exchanger (6) functions as a condenser, and the first outdoor heat exchanger (5) is in a closed state or functions as an evaporator; in the fourth dehumidification reheat mode, neither the first nor the second outdoor heat exchanger (5, 6) is operated; the valve assembly (40) is configured to enable the heat pump system to switch between the first dehumidified reheat mode, the second dehumidified reheat mode, the third dehumidified reheat mode, and the fourth dehumidified reheat mode;

the valve assembly (40) comprises a first four-way valve (2) and a second four-way valve (3), wherein a first port of the first four-way valve (2) is communicated with an exhaust port of the compressor (1), a second port of the first four-way valve (2) is communicated with a first interface of the first outdoor heat exchanger (5), a third port and a fourth port of the first four-way valve (2) are communicated with an air suction port of the compressor (1), a first port of the second four-way valve (3) is communicated with an exhaust port of the compressor (1), a second port of the second four-way valve (3) is communicated with a first interface of the second outdoor heat exchanger (6), and a third port and a fourth port of the second four-way valve (3) are communicated with the air suction port of the compressor (1).

2. The heat pump system according to claim 1, wherein the operating mode comprises a defrost mode in which the valve assembly (40) is configured to cause one of the first and second outdoor heat exchangers (5, 6) to act as a condenser and the other of the first and second outdoor heat exchangers (5, 6) to act as an evaporator.

3. Heat pump system according to claim 2, characterized in that the defrosting mode comprises a first defrosting mode in which the first outdoor heat exchanger (5) acts as a condenser and a second defrosting mode in which the second outdoor heat exchanger (6) acts as an evaporator; in the second defrosting mode, the first outdoor heat exchanger (5) functions as an evaporator, and the second outdoor heat exchanger (6) functions as a condenser; the valve assembly (40) is configured to enable the heat pump system to switch between the first defrost mode and the second defrost mode.

4. A heat pump system according to any one of claims 1-3, further comprising a first outdoor fan (7) and a second outdoor fan (8), the first outdoor fan (7) and the first outdoor heat exchanger (5) being located in a first air duct, the second outdoor fan (8) and the second outdoor heat exchanger (6) being located in a second air duct, the first air duct being provided independently of the second air duct.

5. The heat pump system of claim 1, further comprising an indoor fan (24), wherein the indoor fan (24), the first indoor heat exchanger (22) and the second indoor heat exchanger (23) are located in the same air duct, and indoor side return air generated by the indoor fan (24) sequentially passes through the second indoor heat exchanger (23) and the first indoor heat exchanger (22).

6. The heat pump system according to claim 1, wherein the valve assembly (40) further comprises a first throttling element (9), the first throttling element (9) being connected between a fourth port of the first four-way valve (2) and an intake of the compressor (1).

7. The heat pump system according to claim 1, wherein the valve assembly (40) further comprises a second throttling element (10), the second throttling element (10) being connected between a fourth port of the second four-way valve (3) and an intake of the compressor (1).

8. The heat pump system according to claim 1, wherein the valve assembly (40) further comprises a control valve (4), the control valve (4) being arranged on a connection line between the discharge of the compressor (1) and the first interface of the first indoor heat exchanger (22).

9. The heat pump system according to claim 1, further comprising an outdoor unit (100), wherein the outdoor unit (100) comprises the compressor (1), the outdoor heat exchanger (30), the valve assembly (40), a first expansion valve (11) and a second expansion valve (12), wherein the outdoor heat exchanger (30) comprises a first outdoor heat exchanger (5) and a second outdoor heat exchanger (6), wherein the first expansion valve (11) is connected between a second interface of the first outdoor heat exchanger (5) and a first interface of the outdoor unit (100), and wherein the second expansion valve (12) is connected between a second interface of the second outdoor heat exchanger (6) and a first interface of the outdoor unit (100).

10. The heat pump system according to claim 9, further comprising an indoor unit (200), the indoor unit (200) comprising the first indoor heat exchanger (22), the second indoor heat exchanger (23), a third expansion valve (20) and a fourth expansion valve (21), the third expansion valve (20) being connected between the second interface of the first indoor heat exchanger (22) and the first interface of the indoor unit (200), the fourth expansion valve (21) being connected between the first interface of the second indoor heat exchanger (23) and the first interface of the indoor unit (200), the first interface of the indoor unit (200) being in communication with the first interface of the outdoor unit (100).

11. A control method of a heat pump system, applied to control the heat pump system according to any one of claims 1 to 10, comprising:

the action of a valve assembly (40) in the heat pump system is controlled according to a preset control strategy and based on the operating mode.

12. A control method of a heat pump system, applied to control the heat pump system according to claim 8, comprising:

and controlling the actions of the first four-way valve (2), the second four-way valve (3) and the control valve (4) in the heat pump system according to a preset control strategy and based on the working mode.

13. The control method according to claim 12, characterized in that the control method includes:

when the working mode is a first dehumidification reheating mode, the first port of the first four-way valve (2) is controlled to be communicated with the second port, the third port of the first four-way valve (3) is controlled to be communicated with the fourth port, and the first port of the second four-way valve (3) is controlled to be communicated with the second port, and the third port of the second four-way valve is controlled to be communicated with the fourth port; and controlling the control valve (4) to be in a conducting state.

14. The control method according to claim 12, characterized in that the control method includes:

when the working mode is a second dehumidification reheating mode, a first port of the first four-way valve (2) is controlled to be communicated with the second port, a third port of the first four-way valve is controlled to be communicated with the fourth port, and a first port of the second four-way valve (3) is controlled to be communicated with the fourth port, and a second port of the second four-way valve is controlled to be communicated with the third port; and controlling the control valve (4) to be in a conducting state.

15. The control method according to claim 14, characterized in that the control method includes:

when the working mode is a second dehumidification reheating mode, the first outdoor heat exchanger (5) is controlled to be in a closed state; or,

when the working mode is a second dehumidification reheating mode, the first outdoor heat exchanger (5) is controlled to enter a working state and is used as an evaporator; and

and when the indoor humidity is reduced to the preset humidity and the indoor temperature is smaller than the preset temperature, the working frequency of the compressor (1) is increased.

16. The control method according to claim 12, characterized in that the control method includes:

when the working mode is a third dehumidification reheating mode, the first port of the first four-way valve (2) is controlled to be communicated with the fourth port, the second port of the first four-way valve is controlled to be communicated with the third port, the first port of the second four-way valve (3) is controlled to be communicated with the second port, and the third port of the second four-way valve is controlled to be communicated with the fourth port; the control valve (4) is controlled to be in a cut-off state.

17. The control method according to claim 16, characterized in that the control method includes:

when the working mode is a third dehumidification reheating mode, the second outdoor heat exchanger (6) is controlled to be in a closed state; or,

when the working mode is a third dehumidification reheating mode, the second outdoor heat exchanger (6) is controlled to enter a working state and is used as an evaporator; and

18. The control method according to claim 12, characterized in that the control method includes:

when the working mode is a fourth dehumidification reheating mode, the first port of the first four-way valve (2) is controlled to be communicated with the fourth port, the second port of the first four-way valve (3) is controlled to be communicated with the third port, and the first port of the second four-way valve (3) is controlled to be communicated with the fourth port, and the second port of the second four-way valve is controlled to be communicated with the third port; the control valve (4) is controlled to be in a cut-off state.

19. The control method according to claim 18, characterized in that the control method includes:

when the working mode is a fourth dehumidification reheating mode, the first outdoor heat exchanger (5) and the second outdoor heat exchanger (6) are controlled to be in a closed state; or,

When the working mode is a fourth dehumidification reheating mode, the first outdoor heat exchanger (5) and the second outdoor heat exchanger (6) are controlled to enter a working state and serve as an evaporator; and

20. A control device of a heat pump system comprising a memory and a processor coupled to the memory, the processor being configured to perform the control method of claim 14 or to perform the control method of any of claims 12-19 based on instructions stored in the memory.

21. An air conditioning apparatus comprising a heat pump system according to any one of claims 1 to 10 and/or a control device for a heat pump system according to claim 20.

22. A computer-readable storage medium storing computer instructions for execution by a processor of the control method of claim 11 or of the control method of any one of claims 12 to 19.