CN214148412U

CN214148412U - Heat pump system and air conditioning equipment

Info

Publication number: CN214148412U
Application number: CN202022683476.3U
Authority: CN
Inventors: 戴永福; 杨智峰; 尤文超
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: 2021-09-07
Anticipated expiration: 2030-11-18

Abstract

The utility model relates to a heat pump system and air conditioning equipment, wherein the heat pump system includes compressor (1), first indoor heat exchanger (19), second indoor heat exchanger (20), outdoor heat exchanger (30) and valve member (40), with the gas vent and the induction port of compressor (1), first indoor heat exchanger (19), second indoor heat exchanger (20) and outdoor heat exchanger (30) are connected, valve member (40) are configured to the flow direction of control refrigerant and/or the break-make of connecting line to realize the switching of heat pump system between different mode; wherein the working modes comprise a cooling mode, a heating mode and a dehumidification and reheat mode, and in the dehumidification and reheat mode, the valve assembly (40) is configured to communicate the exhaust port of the compressor (1) with the first interface of the first indoor heat exchanger (19) so that the first indoor heat exchanger (19) can be used as a condenser.

Description

Heat pump system and air conditioning equipment

Technical Field

The utility model relates to an air conditioning equipment technical field especially relates to a heat pump system and air conditioning equipment.

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 constant temperature and humidity machines need to be provided with an electric heating device, for example, when the indoor humidity is higher than the set humidity and the indoor temperature is lower than or equal to the set temperature, the electric heating device needs to be used for increasing the indoor temperature in order to avoid the indoor temperature being too low; for another example, when the indoor temperature is lower than the set temperature, the indoor temperature needs to be raised, but if the outdoor heat exchanger frosts, 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 capability of the heat exchanger in the heat pump system, thereby reducing the heating capability and causing the indoor temperature to fluctuate, and at this time, the electric heating device also needs to be used for adjusting the indoor temperature.

Although the use of the electric heating device can meet the requirement of adjusting the indoor temperature, the electric heating device can increase the power consumption and reduce the energy efficiency.

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

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a heat pump system and air conditioning equipment improve heat pump system's heat transfer performance.

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

a compressor;

the first indoor heat exchanger and the second indoor heat exchanger;

an outdoor heat exchanger; and

the valve assembly is connected with an exhaust port and a 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 cooling mode, a heating mode and a dehumidification and reheating mode, and in the dehumidification and reheating mode, the valve assembly is configured to communicate the exhaust port of the compressor with the first interface of the first indoor heat exchanger, so that the first indoor heat exchanger can be used as a condenser.

In some embodiments, the outdoor heat exchanger includes 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 in the dehumidification and reheat mode.

In some embodiments, the dehumidification-reheat mode includes a first dehumidification-reheat mode in which the first outdoor heat exchanger and the second outdoor heat exchanger both function as a condenser, a second dehumidification-reheat mode, and a third dehumidification-reheat mode; in the second dehumidification and reheating mode, the first outdoor heat exchanger is used as a condenser, and the second outdoor heat exchanger is in a closed state or used as an evaporator; in the third dehumidification and reheating mode, the second outdoor heat exchanger is used as a condenser, and the first outdoor heat exchanger is in a closed state or used as an evaporator; the valve assembly is configured to switch the heat pump system among a first dehumidification and reheat mode, a second dehumidification and reheat mode and a third dehumidification and reheat mode.

In some embodiments, the outdoor heat exchanger includes a first outdoor heat exchanger and a second outdoor heat exchanger, the operating mode includes 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 functions as a condenser and the other of the first outdoor heat exchanger and the second outdoor heat exchanger functions 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 the second outdoor heat exchanger functions as an evaporator; in the second defrosting mode, the first outdoor heat exchanger is used as an evaporator, and the second outdoor heat exchanger is used as a condenser; the valve assembly is configured to enable the heat pump system to switch between a first defrosting mode and a second defrosting 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 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 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 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 valve assembly includes a first four-way valve, a first port of the first four-way valve is communicated with the exhaust port of the compressor, a second port of the first four-way valve is communicated with the first interface of the first indoor heat exchanger, and a third port and a fourth port of the first four-way valve are both communicated with the suction port of the compressor.

In some embodiments, the outdoor heat exchanger includes a first outdoor heat exchanger and a second outdoor heat exchanger, the valve assembly further includes a second four-way valve and a third four-way valve, a first port of the second four-way valve and a first port of the third four-way valve are respectively communicated with the exhaust port of the compressor, a second port of the second four-way valve is communicated with the first interface of the first outdoor heat exchanger, a second port of the third four-way valve is communicated with the first interface of the second outdoor heat exchanger, a third port of the second four-way valve and a third port of the third four-way valve are respectively communicated with the suction port of the compressor, a fourth port of the second four-way valve is communicated with the first interface of the second indoor heat exchanger, and a fourth port of the third four-way valve is connected to the first connection pipe between the fourth port of the second four-way valve and the first interface of the second indoor heat exchanger.

In some embodiments, the valve assembly further comprises a first control valve and a second control valve, the fourth port of the third four-way valve is connected to the connection point a of the first connection line, the first control valve is disposed on the second connection line between the fourth port of the second four-way valve and the connection point a, and the second control valve is disposed on the third connection line between the fourth port of the third four-way valve and the connection point a.

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

In some embodiments, the heat pump system further includes an indoor unit, the indoor unit includes 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 port of the first indoor heat exchanger and the first port of the indoor unit, the fourth expansion valve is connected between the second port of the second indoor heat exchanger and the first port of the indoor unit, and the first port of the indoor unit is communicated with the first port of the outdoor unit.

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 inlet of the compressor.

In some embodiments, the valve assembly further comprises a second throttling element having a first end connected to the suction port of the compressor, a second end in communication with the connecting line between the fourth port of the second four-way valve and the first control valve, a third throttling element having a first end connected to the suction port of the compressor, and a second end in communication with the connecting line between the fourth port of the third four-way valve and the second control valve.

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

Based on the technical scheme, the embodiment of the utility model provides a flow direction and/or connecting line's break-make through valve member control refrigerant, can realize heat pump system at the refrigeration mode, heat the mode and dehumidify the switching between the reheat mode, and under the dehumidification mode of heating, the gas vent that can make the compressor through the valve member communicates with first interface of first indoor heat exchanger, first indoor heat exchanger is as the condenser promptly, thereby heat the indoor environment through first indoor heat exchanger, avoid causing the indoor temperature to reduce too much because the dehumidification, improve heat pump system's heat transfer performance, can also reduce the electric heater unit of use, reduce power consumption, improve the efficiency.

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 embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

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

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

Fig. 3 is a schematic diagram of an embodiment of the heat pump system of the present invention in the second cooling mode.

Fig. 4 is a schematic structural diagram of an embodiment of the heat pump system in the first dehumidification and reheating mode.

Fig. 5 is a schematic structural diagram of an embodiment of the heat pump system in the second dehumidification and reheating mode.

Fig. 6 is a schematic structural diagram of an embodiment of the heat pump system in the third dehumidification and reheating mode.

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

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

Fig. 9 is a schematic structural diagram of an embodiment of the heat pump system in the first defrosting mode.

Fig. 10 is a schematic structural diagram of an embodiment of the heat pump system 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 third four-way valve; 5. a first throttling element; 61. a third throttling element; 62. a second throttling element; 7. a first control valve; 8. a second control valve; 9. a first outdoor heat exchanger; 10. a second outdoor heat exchanger; 11. a first outdoor fan; 12. a second outdoor fan; 13. a first expansion valve; 14. a second expansion valve; 15. a liquid storage tank; 16. a first shut-off valve; 17. a third expansion valve; 18. a fourth expansion valve; 19. a first indoor heat exchanger; 20. a second indoor heat exchanger; 21. an indoor fan; 22. a second stop valve; 23. a third stop valve; 24. a first connecting member; 25. a second connecting member; 26. a third connecting member; 27. 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 of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the invention.

Referring to fig. 1, in some embodiments of the heat pump system provided by the present invention, the heat pump system includes a compressor 1, a first indoor heat exchanger 19, a second indoor heat exchanger 20, an outdoor heat exchanger 30 and a valve assembly 40, the valve assembly 40 is connected to an exhaust port and an intake port of the compressor 1, the first indoor heat exchanger 19, the second indoor heat exchanger 20 and the outdoor heat exchanger 30, and the valve assembly 40 is configured to control a flow direction of a refrigerant and/or on/off of a connection pipeline, so as to switch the heat pump system between different operation modes. Wherein the operation modes include a cooling mode, a heating mode and a dehumidification and reheat mode, in the dehumidification and reheat mode, the valve assembly 40 is configured to communicate the exhaust port of the compressor 1 with the first port of the first indoor heat exchanger 19, so that the first indoor heat exchanger 19 functions as a condenser.

In the above embodiment, the valve assembly 40 controls the flow direction of the refrigerant and/or the on-off of the connecting pipeline, so that the heat pump system can be switched between the cooling mode, the heating mode and the dehumidification and reheating mode, and different requirements of users in different seasons are met. Moreover, 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 19 through the valve assembly 40, that is, the first indoor heat exchanger 19 is used as a condenser, so that the indoor environment is heated through the first indoor heat exchanger 19, the excessive reduction of the indoor temperature caused by dehumidification is avoided, 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 19 is used as a condenser, the first port of the first indoor heat exchanger 19 is directly communicated with 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 reheating efficiency is high.

In some embodiments, the outdoor heat exchanger 30 includes a first outdoor heat exchanger 9 and a second outdoor heat exchanger 10, and the valve assembly 40 is further configured to cause at least one of the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 to function as a condenser in the dehumidification and reheat mode.

In some embodiments, by controlling the valve assembly 40, in the dehumidification and reheating mode, the two heat exchangers disposed outdoors can be simultaneously operated and used as condensers, and at this time, the operating frequency of the compressor 1 is high, and the lubricating oil in the compressor 1 can smoothly flow along with the refrigerant; one of the two heat exchangers arranged outdoors may be in an operating state and function as a condenser, and the other may be in a closed state and may be in an operating state and function as an evaporator. In the embodiment in which one of the two heat exchangers disposed outdoors is in operation and functions as a condenser and the other is in operation and functions as an evaporator, since the first indoor heat exchanger 19 disposed indoors functions as a condenser and the second indoor heat exchanger 20 functions as an evaporator in the dehumidification reheating mode, the indoor and outdoor heat exchangers can achieve better division as a whole, and after increasing the frequency of the compressor 1 in order to increase the reheating capacity of the first indoor heat exchanger 19, the indoor environment can be adjusted to a suitable temperature and humidity by dynamic division between the second indoor heat exchanger 20 and the outdoor heat exchanger functioning as an evaporator.

In some embodiments, the dehumidification-reheat mode includes a first dehumidification-reheat mode in which the first and second outdoor heat exchangers 9 and 10 each function as a condenser, a second dehumidification-reheat mode, and a third dehumidification-reheat mode; in the second dehumidification-reheat mode, the first outdoor heat exchanger 9 functions as a condenser, and the second outdoor heat exchanger 10 is in an off state or functions as an evaporator; in the third dehumidification-reheat mode, the second outdoor heat exchanger 10 functions as a condenser, and the first outdoor heat exchanger 9 is in an off state or functions as an evaporator; the valve assembly 40 is configured to switch the heat pump system between a first dehumidification and reheat mode, a second dehumidification and reheat mode, and a third dehumidification and reheat mode.

As shown in fig. 4, in the first dehumidification and reheating mode, the first outdoor heat exchanger 9, the second outdoor heat exchanger 10, and the first indoor heat exchanger 19 all function as a condenser, the second indoor heat exchanger 20 functions as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 20, and the indoor environment can be reheated by the first indoor heat exchanger 19, thereby preventing the temperature of the indoor environment from being too low to satisfy the dehumidification requirement.

As shown in fig. 5, in the second dehumidification and reheating mode, the first outdoor heat exchanger 9 is in a closed state, the second outdoor heat exchanger 10 and the first indoor heat exchanger 19 both function as a condenser, the second indoor heat exchanger 20 functions as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 20, and the indoor environment can be reheated by the first indoor heat exchanger 19, thereby preventing the temperature of the indoor environment from being too low to meet the dehumidification requirement.

In other embodiments, in the second dehumidification and reheating mode, the first outdoor heat exchanger 9 may also be in an operating state and used as an evaporator, the second outdoor heat exchanger 10 and the first indoor heat exchanger 19 are both used as condensers, the second indoor heat exchanger 20 is used as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 20, and the indoor environment may be reheated by the first indoor heat exchanger 19 to prevent the temperature of the indoor environment from being too low to meet the dehumidification requirement. Meanwhile, when the indoor humidity reaches a preset requirement and the indoor temperature is still low and cannot meet the preset requirement, the first outdoor heat exchanger 9 is also used as an evaporator, the reheating capacity of the first indoor heat exchanger 19 can be improved by increasing the frequency of the compressor 1, and meanwhile, the refrigerant in the second indoor heat exchanger 20 can be distributed to the first outdoor heat exchanger 9, so that excessive dehumidification of the indoor environment caused by the increase of the frequency of the compressor 1 is avoided.

As shown in fig. 6, in the third dehumidification and reheating mode, the second outdoor heat exchanger 10 is in a closed state, the first outdoor heat exchanger 9 and the first indoor heat exchanger 19 both function as condensers, the second indoor heat exchanger 20 functions as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 20, and the indoor environment can be reheated by the first indoor heat exchanger 19, thereby preventing the temperature of the indoor environment from being too low to meet the dehumidification requirement.

In other embodiments, in the third dehumidification and reheating mode, the second outdoor heat exchanger 10 may also be in an operating state and used as an evaporator, the first outdoor heat exchanger 9 and the first indoor heat exchanger 19 are both used as condensers, the second indoor heat exchanger 20 is used as an evaporator, the indoor environment is cooled and dehumidified by the second indoor heat exchanger 20, and the indoor environment may be reheated by the first indoor heat exchanger 19 to prevent the temperature of the indoor environment from being too low to meet the dehumidification requirement. Meanwhile, by using the second outdoor heat exchanger 10 as an evaporator, when the indoor humidity reaches a preset requirement and the indoor temperature is still low and cannot meet the preset requirement, the reheating capacity of the first indoor heat exchanger 19 can be improved by increasing the frequency of the compressor 1, and meanwhile, the refrigerant in the second indoor heat exchanger 20 can be shunted to the second outdoor heat exchanger 10, so that excessive dehumidification of the indoor environment caused by the increase of the frequency of the compressor 1 is avoided.

In some embodiments, the outdoor heat exchanger 30 includes the first and second outdoor heat exchangers 9, 10, and the operation mode includes a defrost mode in which the valve assembly 40 is configured such that one of the first and second outdoor heat exchangers 9, 10 functions as a condenser and the other of the first and second outdoor heat exchangers 9, 10 functions as an evaporator.

When the indoor and outdoor environment temperature is low and a heat pump system is needed for heating, the outdoor heat exchanger can rapidly convey absorbed heat to the indoor environment, so that the frosting phenomenon easily occurs on the outer surface of the outdoor heat exchanger. In some of the above embodiments, one of the first and second outdoor heat exchangers 9 and 10 may be operated as a condenser by controlling the valve assembly 40 to heat-exchange and melt frost condensed on an outer surface of the other of the first and second outdoor heat exchangers 9 and 10 by heat released from the condenser.

In some embodiments, by controlling the valve assembly 40, the switching between the cooling mode, the heating mode, the dehumidification reheating mode and the defrosting mode can be realized, 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 9 functions as a condenser and the second outdoor heat exchanger 10 functions as an evaporator; in the second defrosting mode, the first outdoor heat exchanger 9 functions as an evaporator, and the second outdoor heat exchanger 10 functions as a condenser; the valve assembly 40 is configured to enable the heat pump system to be switched between a first defrost mode and a second defrost mode.

By alternately carrying out the two defrosting modes, the defrosting operation can be respectively carried out on the two outdoor heat exchangers. The heat pump system uses the double-chamber outer side heat exchanger, adopts the first defrosting mode and the second defrosting mode to realize asynchronous defrosting, and the indoor side heat exchanger still keeps a high-pressure state during defrosting, keeps the heat output of the indoor side, and reduces the fluctuation of the indoor temperature caused by the fact that the indoor side heat exchanger does not heat during defrosting of the common heat pump air conditioner.

In some embodiments, the heat pump system further includes a first outdoor fan 11 and a second outdoor fan 12, the first outdoor fan 11 and the first outdoor heat exchanger 9 are located in a first air duct, the second outdoor fan 12 and the second outdoor heat exchanger 10 are located in a second air duct, and the first air duct and the second air duct are independently disposed.

In some embodiments, the heat pump system further includes an indoor fan 21, the first indoor heat exchanger 19, and the second indoor heat exchanger 20 are located in the same duct, and indoor return air generated by the indoor fan 21 passes through the second indoor heat exchanger 20 and the first indoor heat exchanger 19 in sequence.

The second indoor heat exchanger 20 is disposed upstream of the first indoor heat exchanger 19 so that the indoor side return air can pass through the first indoor heat exchanger 19 before passing through the second indoor heat exchanger 20 by the action of the indoor fan 21. The advantage of this arrangement is that when the heat pump system is in the dehumidification and reheat mode, the first indoor heat exchanger 19 functions as a condenser, and the second indoor heat exchanger 20 functions as an evaporator, so that the heat released by the condenser can be prevented from being directly absorbed by the evaporator, which is beneficial to improving the energy efficiency of the indoor heat exchanger.

In some embodiments, the valve assembly 40 includes the first four-way valve 2, the first port D1 of the first four-way valve 2 is communicated with the exhaust port of the compressor 1, the second port C1 of the first four-way valve 2 is communicated with the first port of the first indoor heat exchanger 19, and the third port S1 and the fourth port E1 of the first four-way valve 2 are both communicated with the suction 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 off, the first port D1 is communicated with the second port C1, and the third port S1 is communicated with the fourth port E1.

In some embodiments, the outdoor heat exchanger 30 includes a first outdoor heat exchanger 9 and a second outdoor heat exchanger 10, the valve assembly 40 further includes a second four-way valve 3 and a third four-way valve 4, a first port D2 of the second four-way valve 3 and a first port D3 of the third four-way valve 4 communicate with the discharge port of the compressor 1, respectively, a second port C2 of the second four-way valve 3 communicates with the first port of the first outdoor heat exchanger 9, a second port C3 of the third four-way valve 4 communicates with the first port of the second outdoor heat exchanger 10, a third port S2 of the second four-way valve 3 and a third port S3 of the third four-way valve 4 communicate with the suction port of the compressor 1, respectively, a fourth port E2 of the second four-way valve 3 communicates with the first port of the second indoor heat exchanger 20, and a fourth port E3 of the third four-way valve 4 is connected to a first connection line between the fourth port E2 of the second four-way valve 3 and the first port of the second indoor heat exchanger 20.

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, 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, the first port D3 of the third four-way valve 4 is disposed between the second port C3 and the fourth port E3 of the third four-way valve 4, and the second port C3 of the third four-way valve 4 is disposed between the first port D3 and the third port S3 of the third four-way valve 4.

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 off, the first port D2 is communicated with the second port C2, and the third port S2 is communicated with the fourth port E2. When the third four-way valve 4 is energized, the first port D3 is communicated with the fourth port E3, and the second port C3 is communicated with the third port S3; when the third four-way valve 4 is powered off, the first port D3 is communicated with the second port C3, and the third port S3 is communicated with the fourth port E3.

In some embodiments, the valve assembly 40 further comprises a first control valve 7 and a second control valve 8, the fourth port E3 of the third four-way valve 4 being connected to connection point a of the first connection line, the first control valve 7 being disposed on the second connection line between the fourth port E2 of the second four-way valve 3 and connection point a, the second control valve 8 being disposed on the third connection line between the fourth port E3 of the third four-way valve 4 and connection point a.

In some embodiments, the heat pump system further includes an outdoor unit 100, the outdoor unit 100 includes a compressor 1, a first outdoor heat exchanger 9, a second outdoor heat exchanger 10, a valve assembly 40, a first expansion valve 13 and a second expansion valve 14, the first expansion valve 13 is connected between the second port of the first outdoor heat exchanger 9 and the first port of the outdoor unit 100, and the second expansion valve 14 is connected between the second port of the second outdoor heat exchanger 10 and the first port 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 19, a second indoor heat exchanger 20, a third expansion valve 17, and a fourth expansion valve 18, the third expansion valve 17 is connected between the second port of the first indoor heat exchanger 19 and the first port of the indoor unit 200, the fourth expansion valve 18 is connected between the second port of the second indoor heat exchanger 20 and the first port of the indoor unit 200, and the first port of the indoor unit 200 is communicated with the first port of the outdoor unit 100.

In some embodiments, the valve assembly 40 further comprises a first throttling element 5, the first throttling element 5 being connected between the fourth port E1 of the first four-way valve 2 and the suction of the compressor 1.

By providing the first throttling element 5 between the fourth port E1 of the first four-way valve 2 and the suction port of the compressor 1, the liquid refrigerant on the connecting line between the discharge port of the compressor 1 and the first four-way valve 2 and the internal connecting line of the first four-way valve 2 can be discharged in time after the first four-way valve 2 is reversed, thereby avoiding the liquid impact problem.

In some embodiments, the valve assembly 40 further comprises a second throttling element 62 and a third throttling element 61, a first end of the second throttling element 62 is connected with the suction port of the compressor 1, a second end of the second throttling element 62 is communicated with a connecting line between the fourth port E2 of the second four-way valve 3 and the first control valve 7, a first end of the third throttling element 61 is connected with the suction port of the compressor 1, and a second end of the third throttling element 61 is communicated with a connecting line between the fourth port E3 of the third four-way valve 4 and the second control valve 8.

By providing the second throttling element 62 between the connection line between the fourth port E2 of the second four-way valve 3 and the first control valve 7 and the suction port of the compressor 1, the liquid refrigerant on the connection line between the fourth port E2 of the second four-way valve 3 and the first control valve 7 can be drained in time, avoiding the liquid slugging problem.

By providing the third throttling element 61 between the connection line between the fourth port E3 of the third four-way valve 4 and the second control valve 8 and the suction port of the compressor 1, the liquid refrigerant on the connection line between the fourth port E3 of the third four-way valve 4 and the second control valve 8 can be drained in time, avoiding the liquid slugging problem.

In some embodiments, the first, second and third throttling elements 5, 62, 61 may be capillary tubes.

The working process of an embodiment of the heat pump system of the present invention is described below based on the accompanying drawings 1 to 10:

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 19 and a second indoor heat exchanger 20.

As shown in fig. 2 to 10, the outdoor heat exchanger 30 includes a first outdoor heat exchanger 9 and a second outdoor heat exchanger 10. The valve assembly 40 includes a first four-way valve 2, a second four-way valve 3, a third four-way valve 4, a first control valve 7, and a second control valve 8.

The heat pump system further includes a first throttling element 5, a second throttling element 62, a third throttling element 61, a first outdoor fan 11, a second outdoor fan 12, a first expansion valve 13, a second expansion valve 14, a reservoir tank 15, a first shutoff valve 16, a third expansion valve 17, a fourth expansion valve 18, an indoor fan 21, a second shutoff valve 22, a third shutoff valve 23, a first connecting member 24, a second connecting member 25, a third connecting member 26, and a fourth connecting member 27.

The first connecting piece 24, the second connecting piece 25, the third connecting piece 26 and the fourth connecting piece 27 are all Y-shaped tee joints. The first control valve 7 and the second control valve 8 can adopt bidirectional ball valves, and connecting pipelines of the first control valve 7 and the second control valve 8 can bear pressure and flow bidirectionally.

A first port of the first connection member 24 is communicated with the exhaust port of the compressor 1, a second port of the first connection member 24 is communicated with a first port of the second connection member 25, and a third port of the first connection member 24 is communicated with a first port D1 of the first four-way valve 2. The second connection port of the second connection member 25 communicates with the first port D2 of the second four-way valve 3, and the third connection port of the second connection member 25 communicates with the first port D3 of the third four-way valve 4.

The second port C1 of the first four-way valve 2 is communicated with the first port of the first indoor heat exchanger 19, the third port S1 of the first four-way valve 2 is communicated with the second port of the fourth connecting member 27, the first port of the fourth connecting member 27 is communicated with the suction port of the compressor 1, the fourth port E1 of the first four-way valve 2 is communicated with the first end of the first throttling element 5, and the second end of the first throttling element 5 is connected to the connecting pipeline between the first port of the fourth connecting member 27 and the suction port of the compressor 1.

The second port C2 of the second four-way valve 3 is communicated with the first port of the first outdoor heat exchanger 9, the third port S2 of the second four-way valve 3 is communicated with the third port of the third connection member 26, the third port of the third connection member 26 is communicated with the third port of the fourth connection member 27, the fourth port E2 of the second four-way valve 3 is communicated with the first end of the first control valve 7, and the second end of the first control valve 7 is communicated with the first port of the second indoor heat exchanger 20.

The second port C3 of the third four-way valve 4 is communicated with the first port of the second outdoor heat exchanger 10, the third port S3 of the third four-way valve 4 is communicated with the second port of the third connecting member 26, the fourth port E3 of the third four-way valve 4 is communicated with the first end of the second control valve 8, and the second end of the second control valve 8 is connected to the connection point a on the connection pipeline between the second end of the first control valve 7 and the first port of the second indoor heat exchanger 20.

The first outdoor fan 11 and the first outdoor heat exchanger 9 are located in the first air duct, the second outdoor fan 12 and the second outdoor heat exchanger 10 are located in the second air duct, and the first air duct and the second air duct are independently arranged.

A first end of the first expansion valve 13 is communicated with the second port of the first outdoor heat exchanger 9, and a second end of the first expansion valve 13 is communicated with the liquid storage tank 15. A first end of the second expansion valve 14 is communicated with the second port of the second outdoor heat exchanger 10, and a second end of the second expansion valve 14 is communicated with the liquid storage tank 15.

A first stop valve 16 is disposed between the liquid storage tank 15 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 the first port of the indoor unit 200 is communicated with another first stop valve 16.

A first end of the third expansion valve 17 communicates with the first stop valve 16 located in the indoor unit 200, and a second end of the third expansion valve 17 communicates with the second port of the first indoor heat exchanger 19. A first end of the fourth expansion valve 18 communicates with the first stop valve 16 located in the indoor unit 200, and a second end of the fourth expansion valve 18 communicates with the second port of the second indoor heat exchanger 20.

The indoor fan 21, the first indoor heat exchanger 19 and the second indoor heat exchanger 20 are located in the same air duct, and indoor return air generated by the indoor fan 21 sequentially passes through the second indoor heat exchanger 20 and the first indoor heat exchanger 19.

A second stop valve 22 is disposed between the first indoor heat exchanger 19 and the second port of the indoor unit 200, the second port of the indoor unit 200 is communicated with the second port of the outdoor unit 100, and another second stop valve 22 is disposed between the second port of the outdoor unit 100 and the second port C1 of the first four-way valve 2.

A third stop valve 23 is disposed between the second indoor heat exchanger 20 and the third port of the indoor unit 200, the third port of the indoor unit 200 is communicated with the third port of the outdoor unit 100, and another third stop valve 23 is disposed between the third port of the outdoor unit 100 and the second end of the first control valve 7.

In this embodiment, the heat pump system has two cooling modes, three dehumidification and reheat modes, two heating modes and two defrosting modes, and the specific control mode is shown in the following tables 1 and 2.

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

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

The connection relationship of each component in each operation mode is described in detail as follows:

as shown in fig. 2, in the first cooling mode, the first four-way valve 2 is powered on, the second four-way valve 3 and the third four-way valve 4 are powered off, the first control valve 7 and the second control valve 8 are powered on, the indoor fan 21, the first outdoor fan 11 and the second outdoor fan 12 are all in an operating state, the first expansion valve 13, the second expansion valve 14, the third expansion valve 17 and the fourth expansion valve 18 are all in an open state, the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 are all used as condensers, and the first indoor heat exchanger 19 and the second indoor heat exchanger 20 are all used as evaporators.

One path of the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 15 through the second four-way valve 3, the first outdoor heat exchanger 9 and the first expansion valve 13, and the other path of the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 15 through the third four-way valve 4, the second outdoor heat exchanger 10 and the second expansion valve 14. The refrigerant entering the liquid storage tank 15 flows out of the liquid storage tank 15, reaches the indoor unit 200 through the first stop valve 16, then returns to the compressor 1 through the third expansion valve 17, the first indoor heat exchanger 19 and the first four-way valve 2 in one path, reaches the connection point a through the fourth expansion valve 18, the second indoor heat exchanger 20 and the third stop valve 23 in the other path, and then is divided into two branches, one branch returns to the compressor 1 through the second four-way valve 3, and the other branch returns to the compressor 1 through the third four-way valve 4.

As shown in fig. 3, in the second cooling mode, the first four-way valve 2 is powered on, the second four-way valve 3 and the third four-way valve 4 are powered off, the first control valve 7 and the second control valve 8 are powered on, the indoor fan 21, the first outdoor fan 11 and the second outdoor fan 12 are all in an operating state, the first expansion valve 13, the second expansion valve 14 and the fourth expansion valve 18 are all in an open state, the third expansion valve 17 is in a closed state, the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 are all used as condensers, the first indoor heat exchanger 19 is in a stop state and does not participate in the operation, and the second indoor heat exchanger 20 is used as an evaporator.

One path of the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 15 through the second four-way valve 3, the first outdoor heat exchanger 9 and the first expansion valve 13, and the other path of the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 15 through the third four-way valve 4, the second outdoor heat exchanger 10 and the second expansion valve 14. The refrigerant entering the liquid storage tank 15 flows out of the liquid storage tank 15, reaches the indoor unit 200 through the first stop valve 16, then reaches the connection point a through the fourth expansion valve 18, the second indoor heat exchanger 20 and the third stop valve 23, and then is divided into two branches, one branch returns to the compressor 1 through the second four-way valve 3, and the other branch returns to the compressor 1 through the third four-way valve 4. Wherein the first indoor heat exchanger 19 does not participate in the operation.

The cooling capacity per unit time in the second cooling mode is smaller than that in the first cooling mode. The heat pump system may further include a third cooling mode in addition to the first cooling mode and the second cooling mode. In the third cooling mode, the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 both function as condensers, the second indoor heat exchanger 20 is stopped and does not participate in operation, and the first indoor heat exchanger 19 functions as an evaporator.

The embodiment of the utility model provides an in the refrigeration mode include first refrigeration mode, second refrigeration mode and third refrigeration mode simultaneously, can satisfy user's different demands. When the indoor temperature is high, the third expansion valve 17 and the fourth expansion valve 18 may be opened at the same time, and cooling may be performed at the same time by the first indoor heat exchanger 19 and the second indoor heat exchanger 20; the third expansion valve 17 may be closed when the indoor temperature is too low, and only the second indoor heat exchanger 20 performs cooling; or the fourth expansion valve 18 is closed and cooling is performed only by the first indoor heat exchanger 19.

As shown in fig. 4, in the first dehumidification and reheating mode, the first four-way valve 2, the second four-way valve 3, and the third four-way valve 4 are all powered off, the first control valve 7 and the second control valve 8 are all powered on, the indoor fan 21, the first outdoor fan 11, and the second outdoor fan 12 are all in an operating state, the first expansion valve 13, the second expansion valve 14, the third expansion valve 17, and the fourth expansion valve 18 are all in an open state, the first outdoor heat exchanger 9, the second outdoor heat exchanger 10, and the first indoor heat exchanger 19 are all used as condensers, and the second indoor heat exchanger 20 is used as an evaporator.

One path of the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 15 through the second four-way valve 3, the first outdoor heat exchanger 9 and the first expansion valve 13, and the other path of the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 15 through the third four-way valve 4, the second outdoor heat exchanger 10 and the second expansion valve 14. The refrigerant that has entered the receiver tank 15 flows out of the receiver tank 15, and then reaches the indoor unit 200 through the first stop valve 16. One path of the refrigerant discharged from the exhaust port of the compressor 1 passes through the first four-way valve 2, the second stop valve 22, the first indoor heat exchanger 19 and the third expansion valve 17, then joins with the refrigerant entering the indoor unit 200 through the first stop valve 16, then reaches the connection point a through the fourth expansion valve 18, the second indoor heat exchanger 20 and the third stop valve 23, and then is divided into two branches, one branch returns into the compressor 1 through the second four-way valve 3, and the other branch returns into the compressor 1 through the third four-way valve 4.

In the indoor unit 200, the second indoor heat exchanger 20 is an evaporator, and can cool and dehumidify an indoor environment; the first indoor heat exchanger 19 is a condenser, which can release heat to the indoor, and avoid the over-low temperature of the indoor environment due to the requirement of humidity.

As shown in fig. 5, in the second dehumidification and reheating mode, the first four-way valve 2 and the second four-way valve 3 are both powered off, the third four-way valve 4 is powered on, the first control valve 7 is powered on, the second control valve 8 is powered off, the indoor fan 21 and the first outdoor fan 11 are both in an operating state, the second outdoor fan 12 is in a stop or operating state, the first expansion valve 13, the third expansion valve 17 and the fourth expansion valve 18 are all in an open state, the second expansion valve 14 is in a closed or open state, the first outdoor heat exchanger 9 and the first indoor heat exchanger 19 are both used as condensers, the second indoor heat exchanger 20 is used as an evaporator, and the second outdoor heat exchanger 10 may not participate in operation or may be used as an evaporator. When the second outdoor heat exchanger 10 is used as an evaporator, the second outdoor heat exchanger 10 may split a flow rate of a low-pressure side in the heat pump system, so that a heat exchange amount of the second indoor heat exchanger 20 is kept unchanged, and stability of indoor humidity control is maintained.

When the second outdoor fan 12 is in a stopped state and the second expansion valve 14 is in a closed state, one path of the refrigerant discharged from the exhaust port of the compressor 1 passes through the second four-way valve 3, the first outdoor heat exchanger 9 and the first expansion valve 13, and enters the liquid storage tank 15. The refrigerant that has entered the receiver tank 15 flows out of the receiver tank 15, and then reaches the indoor unit 200 through the first stop valve 16. One path of the refrigerant discharged from the discharge port of the compressor 1 passes through the first four-way valve 2, the second stop valve 22, the first indoor heat exchanger 19 and the third expansion valve 17, then joins the refrigerant entering the indoor unit 200 through the first stop valve 16, reaches the connection point a through the fourth expansion valve 18, the second indoor heat exchanger 20 and the third stop valve 23, and then returns to the compressor 1 through the second four-way valve 3. Wherein the second outdoor heat exchanger 10 does not participate in the operation.

When the second outdoor fan 12 is in an operating state and the second expansion valve 14 is in an open state, one path of the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 15 through the second four-way valve 3, the first outdoor heat exchanger 9 and the first expansion valve 13, and the refrigerant entering the liquid storage tank 15 flows out of the liquid storage tank 15 and then reaches the indoor unit 200 through the first stop valve 16. The refrigerant discharged from the discharge port of the compressor 1 also passes through the first four-way valve 2, the second stop valve 22, the first indoor heat exchanger 19, and the third expansion valve 17, and then joins the refrigerant that has entered the indoor unit 200 through the first stop valve 16. One path of the merged refrigerant reversely flows into the liquid storage tank 15 through the first stop valve 16 and returns to the compressor 1 through the liquid storage tank 15, the second expansion valve 14, the second outdoor heat exchanger 10 and the third four-way valve 4; the other path of the merged refrigerant reaches the connection point a through the fourth expansion valve 18, the second indoor heat exchanger 20, and the third stop valve 23, and then returns to the compressor 1 through the second four-way valve 3. Wherein the second outdoor heat exchanger 10 is used as an evaporator.

As shown in fig. 6, in the third dehumidification and reheat mode, the first four-way valve 2 and the third four-way valve 4 are both powered off, the second four-way valve 3 is powered on, the first control valve 7 is powered off, the second control valve 8 is powered on, the indoor fan 21 and the second outdoor fan 12 are both in an operating state, the first outdoor fan 11 is in a stop or operating state, the second expansion valve 14, the third expansion valve 17 and the fourth expansion valve 18 are all in an open state, the first expansion valve 13 is in a closed or open state, the second outdoor heat exchanger 10 and the first indoor heat exchanger 19 are both used as condensers, the second indoor heat exchanger 20 is used as an evaporator, and the first outdoor heat exchanger 9 may not participate in operation or may be used as an evaporator. When the first outdoor heat exchanger 9 is used as an evaporator, the first outdoor heat exchanger 9 can shunt the flow of the low-pressure side in the heat pump system, so that the heat exchange amount of the second indoor heat exchanger 20 is kept unchanged, and the stability of indoor humidity control is kept.

When the first outdoor fan 11 is in a stopped state and the first expansion valve 13 is in a closed state, one path of the refrigerant discharged from the exhaust port of the compressor 1 passes through the third four-way valve 4, the second outdoor heat exchanger 10 and the second expansion valve 14, and enters the liquid storage tank 15. The refrigerant that has entered the receiver tank 15 flows out of the receiver tank 15, and then reaches the indoor unit 200 through the first stop valve 16. One path of the refrigerant discharged from the discharge port of the compressor 1 passes through the first four-way valve 2, the second stop valve 22, the first indoor heat exchanger 19 and the third expansion valve 17, then joins the refrigerant entering the indoor unit 200 through the first stop valve 16, reaches the connection point a through the fourth expansion valve 18, the second indoor heat exchanger 20 and the third stop valve 23, and then returns to the compressor 1 through the third four-way valve 4. Wherein the first outdoor heat exchanger 9 does not participate in the operation.

When the first outdoor fan 11 is in an operating state and the first expansion valve 13 is in an open state, one path of the refrigerant discharged from the exhaust port of the compressor 1 enters the liquid storage tank 15 through the third four-way valve 4, the second outdoor heat exchanger 10 and the second expansion valve 14. The refrigerant that has entered the receiver tank 15 flows out of the receiver tank 15, and then reaches the indoor unit 200 through the first stop valve 16. The refrigerant discharged from the discharge port of the compressor 1 also passes through the first four-way valve 2, the second stop valve 22, the first indoor heat exchanger 19, and the third expansion valve 17, and then joins the refrigerant that has entered the indoor unit 200 through the first stop valve 16. One path of the merged refrigerant reversely flows into the liquid storage tank 15 through the first stop valve 16 and returns to the compressor 1 through the liquid storage tank 15, the first expansion valve 13, the first outdoor heat exchanger 9 and the second four-way valve 3; the other path of the merged refrigerant reaches a connection point a through the fourth expansion valve 18 and the second indoor heat exchanger 20, and then returns to the compressor 1 through the third four-way valve 4. Wherein the first outdoor heat exchanger 9 is used as an evaporator.

In three dehumidification reheating modes, dehumidification and reheating functions are realized through the mutual cooperation of the first indoor heat exchanger 19 and the second indoor heat exchanger 20, the second indoor heat exchanger 20 is responsible for dehumidification and cooling, because the indoor humidity load is unequal to the cold load, the output of the heat pump system takes the larger of the humidity load and the cold load as the adjusting basis, when the humidity load is larger than the cold load, the indoor temperature can be overshot (the current indoor environment temperature is lower than the set temperature), at the moment, the first indoor heat exchanger 19 intervenes to adjust the cold load, namely, the overlarge refrigerating capacity is compensated and output, and the indoor temperature is matched with the set value.

As shown in fig. 7, in the first heating mode, the first four-way valve 2 is powered off, the second four-way valve 3 and the third four-way valve 4 are both powered on, the first control valve 7 and the second control valve 8 are both powered on, the indoor fan 21, the first outdoor fan 11 and the second outdoor fan 12 are all in an operating state, the first expansion valve 13, the second expansion valve 14, the third expansion valve 17 and the fourth expansion valve 18 are all in an open state, the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 are all used as evaporators, and the first indoor heat exchanger 19 and the second indoor heat exchanger 20 are all used as condensers.

One path of refrigerant discharged from an exhaust port of the compressor 1 enters the indoor unit 200 through the first four-way valve 2 and the second stop valve 22, and reaches the first stop valve 16 through the first indoor heat exchanger 19 and the third expansion valve 17; another path of the refrigerant discharged from the exhaust port of the compressor 1 reaches the connection point a through the second four-way valve 3 and the first control valve 7, then enters the indoor unit 200 through the third stop valve 23, and reaches the first stop valve 16 through the second indoor heat exchanger 20 and the fourth expansion valve 18; one path of the refrigerant discharged from the discharge port of the compressor 1 reaches the connection point a through the third four-way valve 4 and the second control valve 8, joins the refrigerant reaching the connection point a through the first control valve 7, enters the indoor unit 200 through the third stop valve 23, and reaches the first stop valve 16 through the second indoor heat exchanger 20 and the fourth expansion valve 18. The two refrigerant paths reaching the first cut-off valve 16 through the third expansion valve 17 and the fourth expansion valve 18 are merged at the first cut-off valve 16 and then enter the liquid storage tank 15, the refrigerant coming out of the liquid storage tank 15 is divided into two paths, one path returns to the compressor 1 through the first expansion valve 13, the first outdoor heat exchanger 9 and the second four-way valve 3, and the other path returns to the compressor 1 through the second expansion valve 14, the second outdoor heat exchanger 10 and the third four-way valve 4.

As shown in fig. 8, in the second heating mode, the first four-way valve 2, the second four-way valve 3, and the third four-way valve 4 are all energized, the first control valve 7 and the second control valve 8 are all energized, the indoor fan 21, the first outdoor fan 11, and the second outdoor fan 12 are all in an operating state, the first expansion valve 13, the second expansion valve 14, and the fourth expansion valve 18 are all in an open state, the third expansion valve 17 is in a closed state, the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 are all used as evaporators, the first indoor heat exchanger 19 is not involved in operation, and the second indoor heat exchanger 20 is used as a condenser.

One path of the refrigerant discharged from the exhaust port of the compressor 1 reaches a connection point a through the second four-way valve 3 and the first control valve 7, then enters the indoor unit 200 through the third stop valve 23, and reaches the first stop valve 16 through the second indoor heat exchanger 20 and the fourth expansion valve 18; the other path of the refrigerant discharged from the discharge port of the compressor 1 reaches the connection point a through the third four-way valve 4 and the second control valve 8, joins the refrigerant reaching the connection point a through the first control valve 7, enters the indoor unit 200 through the third stop valve 23, reaches the first stop valve 16 through the second indoor heat exchanger 20 and the fourth expansion valve 18, and then enters the accumulator 15. The refrigerant from the liquid storage tank 15 is divided into two paths, one path returns to the compressor 1 through the first expansion valve 13, the first outdoor heat exchanger 9 and the second four-way valve 3, and the other path returns to the compressor 1 through the second expansion valve 14, the second outdoor heat exchanger 10 and the third four-way valve 4.

The second heating mode has a smaller heating capacity per unit time than the first heating mode. The heat pump system may further include a third heating mode in addition to the first heating mode and the second heating mode. In the third heating mode, the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 both function as evaporators, the second indoor heat exchanger 20 is stopped and does not participate in operation, and the first indoor heat exchanger 19 functions as a condenser.

The embodiment of the utility model provides an in the mode of heating include first mode of heating, second mode of heating and third mode of heating simultaneously, can satisfy user's different demands. When the indoor temperature does not reach the required temperature, the third expansion valve 17 and the fourth expansion valve 18 may be simultaneously opened, and heating may be simultaneously performed by the first indoor heat exchanger 19 and the second indoor heat exchanger 20; the third expansion valve 17 may be closed when the indoor temperature exceeds the required temperature, and heating may be performed only by the second indoor heat exchanger 20; alternatively, the fourth expansion valve 18 is closed, and heating is performed only by the first indoor heat exchanger 19.

As shown in fig. 9, in the first defrosting mode, the first four-way valve 2 and the third four-way valve 4 are both powered on, the second four-way valve 3 is powered off, the first control valve 7 is powered off, the second control valve 8 is powered on, the indoor fan 21 and the second outdoor fan 12 are both in an operating state, the first outdoor fan 11 is in a stopped state, the first expansion valve 13, the second expansion valve 14 and the fourth expansion valve 18 are all in an open state, the third expansion valve 17 is in a closed state, the first outdoor heat exchanger 9 and the second indoor heat exchanger 20 are both used as condensers, the first indoor heat exchanger 19 does not participate in the operation, and the second outdoor heat exchanger 10 is used as an evaporator.

One path of the refrigerant discharged from the exhaust port of the compressor 1 reaches the connection point a through the third four-way valve 4 and the second control valve 8, then enters the indoor unit 200 through the third stop valve 23, and then enters the liquid storage tank 15 through the second indoor heat exchanger 20, the fourth expansion valve 18 and the first stop valve 16. The refrigerant from the accumulator 15 is merged with the refrigerant discharged from the discharge port of the compressor 1 through the second four-way valve 3 and the first outdoor heat exchanger 9 to the first expansion valve 13, and then returned to the compressor 1 through the second expansion valve 14, the second outdoor heat exchanger 10 and the third four-way valve 4.

As shown in fig. 10, in the second defrosting mode, the first four-way valve 2 and the second four-way valve 3 are both powered on, the third four-way valve 4 is powered off, the first control valve 7 is powered on, the second control valve 8 is powered off, the indoor fan 21 and the first outdoor fan 11 are both in an operating state, the second outdoor fan 12 is in a stopped state, the first expansion valve 13, the second expansion valve 14 and the fourth expansion valve 18 are all in an open state, the third expansion valve 17 is in a closed state, the second outdoor heat exchanger 10 and the second indoor heat exchanger 20 are both used as condensers, the first indoor heat exchanger 19 does not participate in the operation, and the first outdoor heat exchanger 9 is used as an evaporator.

One path of the refrigerant discharged from the exhaust port of the compressor 1 reaches the connection point a through the second four-way valve 3 and the first control valve 7, then enters the indoor unit 200 through the third stop valve 23, and then enters the liquid storage tank 15 through the second indoor heat exchanger 20, the fourth expansion valve 18 and the first stop valve 16. The refrigerant from the accumulator 15 is merged with the refrigerant discharged from the discharge port of the compressor 1 through the third four-way valve 4 and the second outdoor heat exchanger 10 to the second expansion valve 14, and then returned to the compressor 1 through the first expansion valve 13, the first outdoor heat exchanger 9 and the second four-way valve 3.

In the outdoor unit 100, the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 alternately serve as an evaporator and a condenser, and heat emitted from the condenser can be used to melt frost formed by heat absorption of the evaporator, thereby achieving asynchronous defrosting.

In one embodiment, when a cooling load or a moisture load exists in the room, the system firstly enters a refrigeration mode, the cooling load can be represented by a functional relation of a difference value of the indoor environment temperature and the set temperature, and the moisture load can be represented by a functional relation of a difference value of the indoor moisture content and the set moisture content. When the moisture load is larger than the cooling load, for example, the moisture content is not lower than the set value, but the indoor temperature is already lower than the set value, the first dehumidification and reheating mode is entered.

In the first dehumidification and reheating mode, if the humidity 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 17 is increased, and the heat exchange amount of the first indoor heat exchanger 19 is increased; if the heat exchange amount of the first indoor heat exchanger 19 is the largest (the heat exchange amount of the first outdoor heat exchanger 9 and the second outdoor heat exchanger 10 is reduced to the lowest), the indoor heat load requirement is still not met (the current indoor temperature is lower than the preset temperature), entering a second dehumidification and reheating mode or a third dehumidification and reheating mode; the compressor 1 improves the capacity output, further increases the heat exchange amount of the first indoor heat exchanger 19, switches to the first outdoor heat exchanger 9 or the second outdoor heat exchanger 10 on the low-pressure side, and shunts the low-pressure side flow output by the compressor 1, so that the heat exchange amount of the second indoor heat exchanger 20 is kept unchanged, and the humidity control is kept stable.

When the indoor heat load is required, a first heating mode or a second heating mode is entered, and the first defrosting mode or the second defrosting mode is triggered according to the condition corresponding to whether the corresponding outdoor heat exchanger needs defrosting.

When the indoor temperature is lower 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 defrosts, so that the temperature fluctuation can not meet the requirement, and defrosting is needed at the moment. The heat pump system uses the double-chamber outer side heat exchanger, adopts the first defrosting mode and the second defrosting mode to realize asynchronous defrosting, and the indoor side heat exchanger still keeps a high-pressure state during defrosting, keeps the heat output of the indoor side, and reduces the fluctuation of the indoor temperature caused by the fact that the indoor side heat exchanger does not heat during defrosting of the common heat pump air conditioner.

Based on foretell heat pump system, the utility model also provides a heat pump system's control flow, this control flow is applied to and controls foretell heat pump system, include:

determining the working modes of the heat pump system, wherein the working modes comprise a refrigeration mode, a heating mode and a dehumidification reheating mode;

the operation 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, the third four-way valve 4, the first control valve 7 and the second control valve 8 in the heat pump system according to a preset control strategy and based on the working mode.

In some embodiments, the control flow comprises:

when the working mode is the first dehumidification and reheating mode, the first port D1 and the second port C1 of the first four-way valve 2 are controlled to be communicated, the third port S1 and the fourth port E1 are controlled to be communicated, the first port D2 and the second port C2 of the second four-way valve 3 are controlled to be communicated, the third port S2 and the fourth port E2 of the second four-way valve 3 are controlled to be communicated, the first port D3 and the second port C3 of the third four-way valve 4 are controlled to be communicated, and the third port S3 and the fourth port E3 of the third four-way valve 4 are controlled to be communicated; the first control valve 7 and the second control valve 8 are controlled to be in a conducting state.

In some embodiments, the control flow comprises:

when the working mode is the second dehumidification and reheating mode, the first port D1 and the second port C1 of the first four-way valve 2 are communicated, the third port S1 and the fourth port E1 are communicated, the first port D2 and the fourth port E2 of the second four-way valve 3 are communicated, the second port C2 and the third port S2 of the second four-way valve 3 are communicated, the first port D3 and the second port C3 of the third four-way valve 4 are communicated, and the third port S3 and the fourth port E3 are communicated; the first control valve 7 is controlled to be in the off state, and the second control valve 8 is controlled to be in the on state.

In some embodiments, the control flow comprises:

and when the working mode is the second dehumidification and reheating mode, controlling the first outdoor heat exchanger 9 to be in a closed state.

In some embodiments, the control flow comprises:

when the working mode is the second dehumidification and reheating mode, the first outdoor heat exchanger 9 is controlled to be in a working state and used as an evaporator;

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 flow comprises:

when the working mode is the third dehumidification and reheating mode, the first port D1 of the first four-way valve 2 is controlled to be communicated with the second port C1, the third port S1 is controlled to be communicated with the fourth port E1, the first port D2 of the second four-way valve 3 is controlled to be communicated with the second port C2, the third port S2 of the second four-way valve 3 is controlled to be communicated with the fourth port E2, the first port D3 of the third four-way valve 4 is controlled to be communicated with the fourth port E3, and the second port C3 of the third four-way valve 4 is controlled to be communicated with the third port S3; the first control valve 7 is controlled to be in the on state, and the second control valve 8 is controlled to be in the off state.

In some embodiments, the control flow comprises:

and when the working mode is the third dehumidification and reheating mode, controlling the second outdoor heat exchanger 10 to be in a closed state.

In some embodiments, the control flow comprises:

when the working mode is the third dehumidification and reheating mode, the second outdoor heat exchanger 10 is controlled to enter the working state and is used as an evaporator;

The utility model also provides an air conditioning equipment, including foretell heat pump system. The positive effects of the heat pump system are also applicable to the air conditioning equipment, and the details are not repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the utility model discloses a do not deviate from under the prerequisite of the principle, still can be right the utility model discloses a specific embodiment modifies or carries out the equivalent replacement to some technical features, and these are modified and should be covered with the equivalent replacement in the middle of the technical scheme scope of the utility model.

Claims

1. A heat pump system, comprising:

a compressor (1);

a first indoor heat exchanger (19), a second indoor heat exchanger (20);

an outdoor heat exchanger (30); and

a valve assembly (40) connected to the air outlet and the air inlet of the compressor (1), the first indoor heat exchanger (19), the second indoor heat exchanger (20) and the outdoor heat exchanger (30), wherein 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 switch the heat pump system between different working modes;

wherein the working modes comprise a cooling mode, a heating mode and a dehumidification and reheat mode, in the dehumidification and reheat mode, the valve assembly (40) is configured to communicate the exhaust port of the compressor (1) with the first interface of the first indoor heat exchanger (19) so that the first indoor heat exchanger (19) is used as a condenser.

2. The heat pump system of claim 1, wherein the outdoor heat exchanger (30) comprises a first outdoor heat exchanger (9) and a second outdoor heat exchanger (10), and wherein the valve assembly (40) is further configured to cause at least one of the first outdoor heat exchanger (9) and the second outdoor heat exchanger (10) to function as a condenser in the dehumidification and reheat mode.

3. The heat pump system according to claim 2, wherein the dehumidification-reheat mode includes a first dehumidification-reheat mode in which the first outdoor heat exchanger (9) and the second outdoor heat exchanger (10) each function as a condenser, a second dehumidification-reheat mode, and a third dehumidification-reheat mode; in the second dehumidification and reheat mode, the first outdoor heat exchanger (9) is used as a condenser, and the second outdoor heat exchanger (10) is in a closed state or used as an evaporator; in the third dehumidification and reheat mode, the second outdoor heat exchanger (10) functions as a condenser, and the first outdoor heat exchanger (9) is in a closed state or functions as an evaporator; the valve assembly (40) is configured to switch the heat pump system between the first dehumidification and reheat mode, the second dehumidification and reheat mode, and the third dehumidification and reheat mode.

4. The heat pump system according to claim 1, wherein said outdoor heat exchanger (30) comprises a first outdoor heat exchanger (9) and a second outdoor heat exchanger (10), said operating mode comprising a defrost mode in which said valve assembly (40) is configured such that one of said first outdoor heat exchanger (9) and said second outdoor heat exchanger (10) functions as a condenser and the other of said first outdoor heat exchanger (9) and said second outdoor heat exchanger (10) functions as an evaporator.

5. The heat pump system according to claim 4, wherein the defrosting mode includes a first defrosting mode in which the first outdoor heat exchanger (9) functions as a condenser and the second outdoor heat exchanger (10) functions as an evaporator; in the second defrosting mode, the first outdoor heat exchanger (9) functions as an evaporator and the second outdoor heat exchanger (10) functions as a condenser; the valve assembly (40) is configured to enable the heat pump system to switch between the first and second defrost modes.

6. The heat pump system according to any one of claims 2 to 5, further comprising a first outdoor fan (11) and a second outdoor fan (12), wherein the first outdoor fan (11) and the first outdoor heat exchanger (9) are located in a first air duct, the second outdoor fan (12) and the second outdoor heat exchanger (10) are located in a second air duct, and the first air duct and the second air duct are independently arranged.

7. The heat pump system according to claim 1, further comprising an indoor fan (21), wherein the indoor fan (21), the first indoor heat exchanger (19) and the second indoor heat exchanger (20) are located in the same duct, and indoor return air generated by the indoor fan (21) passes through the second indoor heat exchanger (20) and the first indoor heat exchanger (19) in sequence.

8. The heat pump system according to claim 1, wherein the valve assembly (40) comprises a first four-way valve (2), a first port (D1) of the first four-way valve (2) is communicated with an exhaust port of the compressor (1), a second port (C1) of the first four-way valve (2) is communicated with a first port of the first indoor heat exchanger (19), and a third port (S1) and a fourth port (E1) of the first four-way valve (2) are both communicated with an intake port of the compressor (1).

9. The heat pump system according to claim 8, wherein the outdoor heat exchanger (30) includes a first outdoor heat exchanger (9) and a second outdoor heat exchanger (10), the valve assembly (40) further includes a second four-way valve (3) and a third four-way valve (4), a first port (D2) of the second four-way valve (3) and a first port (D3) of the third four-way valve (4) are respectively communicated with the discharge port of the compressor (1), a second port (C2) of the second four-way valve (3) is communicated with the first interface of the first outdoor heat exchanger (9), a second port (C3) of the third four-way valve (4) is communicated with the first interface of the second outdoor heat exchanger (10), a third port (S2) of the second four-way valve (3) and a third port (S3) of the third four-way valve (4) are respectively communicated with the suction port of the compressor (1), a fourth port (E2) of the second four-way valve (3) is communicated with the first interface of the second indoor heat exchanger (20), and a fourth port (E3) of the third four-way valve (4) is connected to a first connection pipeline between the fourth port (E2) of the second four-way valve (3) and the first interface of the second indoor heat exchanger (20).

10. The heat pump system according to claim 9, wherein the valve assembly (40) further comprises a first control valve (7) and a second control valve (8), the fourth port (E3) of the third four-way valve (4) being connected to the connection point a of the first connection line, the first control valve (7) being arranged on the second connection line between the fourth port (E2) of the second four-way valve (3) and the connection point a, the second control valve (8) being arranged on the third connection line between the fourth port (E3) of the third four-way valve (4) and the connection point a.

11. The heat pump system according to claim 10, further comprising an outdoor unit (100), wherein the outdoor unit (100) includes the compressor (1), the first outdoor heat exchanger (9), the second outdoor heat exchanger (10), the valve assembly (40), a first expansion valve (13), and a second expansion valve (14), the first expansion valve (13) is connected between the second port of the first outdoor heat exchanger (9) and the first port of the outdoor unit (100), and the second expansion valve (14) is connected between the second port of the second outdoor heat exchanger (10) and the first port of the outdoor unit (100).

12. The heat pump system according to claim 11, further comprising an indoor unit (200), wherein the indoor unit (200) comprises the first indoor heat exchanger (19), the second indoor heat exchanger (20), a third expansion valve (17), and a fourth expansion valve (18), wherein the third expansion valve (17) is connected between the second port of the first indoor heat exchanger (19) and the first port of the indoor unit (200), the fourth expansion valve (18) is connected between the second port of the second indoor heat exchanger (20) and the first port of the indoor unit (200), and the first port of the indoor unit (200) communicates with the first port of the outdoor unit (100).

13. Heat pump system according to claim 8, wherein the valve assembly (40) further comprises a first throttling element (5), the first throttling element (5) being connected between the fourth port (E1) of the first four-way valve (2) and the suction of the compressor (1).

14. The heat pump system according to claim 10, wherein the valve assembly (40) further comprises a second throttling element (62) and a third throttling element (61), a first end of the second throttling element (62) being connected with the suction of the compressor (1), a second end of the second throttling element (62) being in communication with a connection line between the fourth port (E2) of the second four-way valve (3) and the first control valve (7), a first end of the third throttling element (61) being connected with the suction of the compressor (1), a second end of the third throttling element (61) being in communication with a connection line between the fourth port (E3) of the third four-way valve (4) and the second control valve (8).

15. An air conditioning apparatus comprising the heat pump system according to any one of claims 1 to 14.