CN107883602B

CN107883602B - Refrigerant circulation system and control method thereof

Info

Publication number: CN107883602B
Application number: CN201711294135.3A
Authority: CN
Inventors: 杨瑞琦; 郑波; 梁祥飞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2017-12-08
Filing date: 2017-12-08
Publication date: 2023-07-25
Anticipated expiration: 2037-12-08
Also published as: CN107883602A

Abstract

The invention discloses a refrigerant circulation system and a control method thereof. The refrigerant circulation system comprises a compressor, an outdoor heat exchange part, an indoor heat exchange part and a throttling device which are connected through pipelines, wherein the pipelines comprise a first pipeline for connecting an exhaust port of the compressor with a heating operation refrigerant inlet of the indoor heat exchange part and a second pipeline for connecting a heating operation refrigerant outlet of the indoor heat exchange part with a heating operation refrigerant inlet of the outdoor heat exchange part, the refrigerant circulation system further comprises an energy storage module, the energy storage module comprises a heat storage/cooling part, a first heat exchange flow path and a second heat exchange flow path, the heat exchange flow path can exchange heat with the heat storage/cooling part, first ends of the first heat exchange flow path and the second heat exchange flow path are connected with the first pipeline, and second ends of the first heat exchange flow path and the second heat exchange flow path are connected with the second pipeline. Two ends of the two heat exchange flow paths are connected into a main refrigerant pipeline of the refrigerant circulation system, so that the two heat exchange flow paths can respectively and independently participate in refrigerant circulation.

Description

Refrigerant circulation system and control method thereof

Technical Field

The invention relates to the technical field of refrigeration and heating systems, in particular to a refrigerant circulation system and a control method thereof.

Background

When the heat pump system or the air conditioning system operates in a heating mode, particularly when the outdoor temperature is low and the humidity is high, the outdoor heat exchanger is extremely easy to frost, and the performance of the heat exchanger is seriously affected, so that the outdoor heat exchanger needs to be defrosted, and the commonly used defrosting modes at present comprise reverse circulation defrosting, hot gas bypass defrosting and heat storage defrosting. When the reverse circulation defrosting is performed, the system is a refrigeration cycle, and heat is not supplied to the room when defrosting is performed; when the hot gas bypasses defrosting, defrosting can be performed only by supplying heat through the compressor, so that defrosting time is relatively long, and defrosting is not easy to clean. Both defrosting modes can cause indoor temperature fluctuation, and indoor comfort is seriously affected. And defrosting by using heat stored in the heat storage material can accelerate defrosting, so that indoor temperature fluctuation is small, and the method is a relatively good mode.

In the existing refrigerant circulation system for defrosting by utilizing heat accumulation of heat accumulation materials, when the system is in defrosting, the system still operates in a heating mode, the heat accumulator with the heat accumulation materials and the outdoor heat exchanger form a refrigerant circulation loop, and the indoor heat exchanger and the outdoor heat exchanger form a refrigerant circulation loop, so that the heat accumulator is used as a heat source to supply heat for the indoor heat exchanger and the outdoor heat exchanger at the same time, and the refrigerant after heat exchange in the indoor heat exchanger still flows into the outdoor heat exchanger, so that defrosting time is long, and the operation stability of the refrigerant circulation system is affected.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a refrigerant circulation system and a control method thereof, which can simultaneously ensure indoor comfort and defrosting efficiency of an outdoor heat exchanger.

In order to achieve the above purpose, on one hand, the present invention adopts the following technical scheme:

the utility model provides a refrigerant circulation system, includes compressor, outdoor heat exchange portion, indoor heat exchange portion and throttling arrangement that the pipeline is connected, the pipeline is including connecting the gas vent of compressor with the first pipeline of the heating operation refrigerant entry of indoor heat exchange portion, and connect the heating operation refrigerant export of indoor heat exchange portion with the second pipeline of the heating operation refrigerant entry of outdoor heat exchange portion, refrigerant circulation system still includes energy storage module, energy storage module include heat accumulation/cold part and can with heat accumulation/cold part heat transfer's first heat transfer flow path and second heat transfer flow path, first heat transfer flow path with the first end of second heat transfer flow path all with first pipeline connection, first heat transfer flow path with the second end of second heat transfer flow path all with the second pipeline connection.

Preferably, the first conduit selectively communicates and is blocked at a first length of tubing between a first end of the first heat exchange flow path and a first end of the second heat exchange flow path, and the second conduit selectively communicates and is blocked at a second length of tubing between a second end of the first heat exchange flow path and a second end of the second heat exchange flow path.

Preferably, the exhaust port of the compressor is selectively connected to the first heat exchange flow path or the first pipe section, and the heating operation refrigerant inlet of the indoor heat exchange portion is selectively connected to the second heat exchange flow path or the first pipe section.

Preferably, the refrigerant circulation system further comprises a first three-way valve and a second three-way valve, wherein a first valve port of the first three-way valve is connected with an exhaust port of the compressor, a second valve port is connected with the first heat exchange flow path, and a third valve port is connected with the first pipe section; a first valve port of the second three-way valve is connected with a heating operation refrigerant inlet of the indoor heat exchange part, a second valve port is connected with the second heat exchange flow path, and a third valve port is connected with the first pipe section; and/or the number of the groups of groups,

the refrigerant circulation system further comprises a first switch valve arranged on the second pipe section.

Preferably, a first end of the first heat exchange flow path is connected to the first pipeline through a first connecting section, a second end of the first heat exchange flow path is connected to the second pipeline through a second connecting section, a first end of the second heat exchange flow path is connected to the first pipeline through a third connecting section, and a second end of the second heat exchange flow path is connected to the second pipeline through a fourth connecting section;

And the first connecting section is connected with the first branch circuit between the third connecting section, and/or the second branch circuit is connected between the second connecting section and the fourth connecting section.

Preferably, a second switch valve is arranged on the first branch; and/or a third switch valve is arranged on the second branch.

Preferably, the refrigerant circulation system further comprises a refrigerant driving device for driving the refrigerant on the second heat exchange flow path to flow.

Preferably, the refrigerant driving device is disposed on the fourth connecting section.

Preferably, the second connecting section is provided with a first flow control valve; and/or the number of the groups of groups,

a second flow control valve is arranged on the fourth connecting section; and/or the number of the groups of groups,

and the fourth connecting section is provided with a gas-liquid separator.

Preferably, a heat dissipation air duct penetrating through the heat storage/cooling part is arranged in the heat storage/cooling part.

Preferably, the energy storage module further comprises an air flow driving device for forming air flow in the heat dissipation air duct.

Preferably, a first fin structure is arranged on the air duct wall of the heat dissipation air duct; and/or the number of the groups of groups,

the energy storage module further comprises a shell, the heat storage/cooling part is accommodated in the shell, and a second fin structure is arranged on the shell.

Preferably, the outdoor heat exchange part is arranged in the outdoor unit, the indoor heat exchange part is arranged in the indoor unit, and the energy storage module is arranged in the outdoor unit and/or the indoor unit.

Preferably, a plurality of phase change energy storage materials are arranged in the heat storage/cold part,

the refrigerant circulation system is a single refrigeration system, and the phase change point temperature range of the phase change energy storage material is 10-20 ℃; or alternatively, the process may be performed,

the refrigerant circulation system is a single heating system, and the phase change point temperature range of the phase change energy storage material is 35-65 ℃; or alternatively, the process may be performed,

the refrigerant circulation system is a heating and refrigerating system, and the phase change point temperature range of the phase change energy storage material is 10-60 ℃.

Preferably, the refrigerant circulation system further comprises a four-way valve.

On the other hand, the invention adopts the following technical scheme:

the control method of the refrigerant circulation system comprises the steps that the refrigerant circulation system is provided with a conventional heating mode, and the compressor, the outdoor heat exchange part and the indoor heat exchange part are controlled to form a heating loop in the conventional heating mode; and/or the number of the groups of groups,

the refrigerant circulation system is provided with a defrosting mode, in the defrosting mode, the four-way valve is controlled to change direction, the compressor, the outdoor heat exchange part and the first heat exchange flow path are controlled to form a defrosting loop, and the indoor heat exchange part and the second heat exchange flow path are controlled to form a heating loop; and/or the number of the groups of groups,

The refrigerant circulation system is provided with a rapid heating mode, and in the rapid heating mode, the first heat exchange flow path and the second heat exchange flow path are controlled to be connected in parallel and then form a heating loop with the compressor, the outdoor heat exchange part and the indoor heat exchange part; and/or the number of the groups of groups,

the refrigerant circulation system is provided with a heating heat storage mode, and in the heating heat storage mode, the indoor heat exchange part is controlled to be connected with the first heat exchange flow path and the second heat exchange flow path in parallel; and/or the number of the groups of groups,

the refrigerant circulation system is provided with a low-load mode, the compressor is controlled to stop in the low-load mode, and the first heat exchange flow path and the second heat exchange flow path are connected in parallel and then form a heating loop with the indoor heat exchange part; and/or the number of the groups of groups,

the refrigerant circulation system is provided with an energy storage mode, and in the energy storage mode, the first heat exchange flow path and the second heat exchange flow path are controlled to be connected in parallel and then form an energy storage loop together with the compressor and the outdoor heat exchange part.

Preferably, when the refrigerant circulation system starts heating, judging whether the indoor environment temperature is TA and the temperature of the heat storage/cooling part is TS, wherein the TA is smaller than a first preset temperature and the TS is larger than a second preset temperature, if yes, controlling the refrigerant circulation system to operate a rapid heating mode, otherwise, operating a conventional heating mode; and/or the number of the groups of groups,

Under the conventional heating mode or the rapid heating mode, judging whether the indoor environment temperature is TA and the temperature of the heat storage/cooling part is TS, wherein the TA is more than a third preset temperature and the TS is less than a fourth preset temperature, and if yes, controlling the refrigerant circulation system to enter a heating heat storage mode; and/or the number of the groups of groups,

when the indoor environment temperature TA reaches or exceeds the indoor environment target temperature and the temperature TS of the heat storage/cooling part reaches or exceeds the target heat storage temperature, controlling the refrigerant circulation system to enter a low-load mode; and/or the number of the groups of groups,

in the low load mode, when the temperature of the heat storage/cooling part is TS and the indoor environment temperature TA meets the condition TS < TA+DeltaT5, the refrigerant circulation system is controlled to exit the low load mode.

Preferably, the first predetermined temperature is an indoor environment target temperature TAS- Δt1; and/or the number of the groups of groups,

the second predetermined temperature is tcond+Δt2; and/or the number of the groups of groups,

the third preset temperature is the indoor environment target temperature TAS-delta T3; and/or the number of the groups of groups,

the fourth predetermined temperature is a target heat storage temperature TSS- Δt4.

Preferably, in the conventional heating mode, an exhaust port of the compressor is controlled to be connected with the first pipe section, a heating operation refrigerant inlet of the indoor heat exchange part is connected with the first pipe section, the second pipe section circulates, and the first flow control valve and the second flow control valve are in a fully closed state; and/or the number of the groups of groups,

In the rapid heating mode, an exhaust port of the compressor is controlled to be connected with the first heat exchange flow path, a heating operation refrigerant inlet of the indoor heat exchange part is controlled to be connected with the second heat exchange flow path, the second pipe section circulates, the first branch and the second branch are opened, the first flow control valve is in a fully closed state, and the second flow control valve is in a fully opened state; and/or the number of the groups of groups,

in the heating and heat storage mode, an exhaust port of the compressor is controlled to be connected with the first heat exchange flow path, a heating operation refrigerant inlet of the indoor heat exchange part is controlled to be connected with the second heat exchange flow path, the second pipe section flows, the first branch and the second branch are opened, the second flow control valve is in a fully closed state, and the refrigerant flow in the first heat exchange flow path and the second heat exchange flow path is regulated by regulating the opening of the first flow control valve; and/or the number of the groups of groups,

in the defrosting mode, an exhaust port of the compressor is controlled to be connected with the first heat exchange flow path, a heating operation refrigerant inlet of the indoor heat exchange part is controlled to be connected with the second heat exchange flow path, the second pipe section is cut off, the first branch and the second branch are closed, the first flow control valve is in a full-open state, and the refrigerant flow in the second heat exchange flow path is regulated by regulating the opening of the second flow control valve; and/or the number of the groups of groups,

In the low-load mode, the compressor is controlled to be shut down, an exhaust port of the compressor is connected with the first pipe section, a heating operation refrigerant inlet of the indoor heat exchange part is connected with the second heat exchange flow path, the second pipe section is cut off, the first branch and the second branch are opened, the first flow control valve is in a fully closed state, and the second flow control valve is in a fully opened state; and/or the number of the groups of groups,

and in the energy storage mode, an exhaust port of the compressor is controlled to be connected with the first heat exchange flow path, a heating operation refrigerant inlet of the indoor heat exchange part is connected with the first pipe section, the second pipe section is cut off, the first branch and the second branch are opened, the second flow control valve is in a fully closed state, and the refrigerant flow in the first heat exchange flow path and the second heat exchange flow path is regulated by regulating the opening of the first flow control valve.

Preferably, the fourth connecting section is provided with a refrigerant driving device, and the control method includes:

under the conventional heating mode, controlling the refrigerant driving device to be in a closed state; and/or the number of the groups of groups,

in the rapid heating mode, controlling the refrigerant driving device to be in an on state; and/or the number of the groups of groups,

In the heating and heat storage mode, controlling the refrigerant driving device to be in a closed state; and/or the number of the groups of groups,

in the defrosting mode, controlling the refrigerant driving device to be in an on state; and/or the number of the groups of groups,

in the low-load mode, controlling the refrigerant driving device to be in an on or off state; and/or the number of the groups of groups,

and in the energy storage mode, controlling the refrigerant driving device to be in a closed state.

The heat exchange flow paths capable of exchanging heat with the heat storage/cooling part are included in the energy storage module of the refrigerant circulation system, and two ends of the two heat exchange flow paths are connected into the main refrigerant pipeline of the refrigerant circulation system, so that the two heat exchange flow paths can respectively and independently participate in refrigerant circulation, for example, when the refrigerant circulation system is used for defrosting, one heat exchange flow path is used for supplying heat to the indoor space, the other heat exchange flow path participates in defrosting of the outdoor heat exchanger, so that the indoor space and the outdoor space form mutually independent refrigerant circulation, the comfort level of the indoor temperature is ensured, the defrosting efficiency of the refrigerant circulation system is ensured, and in addition, the two heat exchange flow paths are connected into the main refrigerant pipeline of the refrigerant circulation system, so that the two heat exchange flow paths can both participate in heating and refrigerating of the refrigerant circulation system and heat storage of the energy storage module, and the utilization rate of the energy storage module is improved.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 shows a schematic structural diagram of a refrigerant circulation system provided by the invention;

fig. 2 shows a refrigerant flow diagram of the refrigerant circulation system provided by the invention when the refrigerant circulation system operates in a conventional heating mode;

FIG. 3 shows a refrigerant flow diagram of the refrigerant circulation system provided by the invention when the refrigerant circulation system operates in a rapid heating mode;

fig. 4 shows a refrigerant flow diagram of the refrigerant circulation system provided by the invention in a heating and heat storage mode;

fig. 5 shows a refrigerant flow diagram of the refrigerant circulation system in a defrosting mode;

FIG. 6 shows a refrigerant flow diagram of the refrigerant circulation system provided by the invention in a low load mode of operation;

fig. 7 shows a refrigerant flow diagram of the refrigerant circulation system provided by the invention in a heat storage mode;

fig. 8 is a front view of an energy storage module in a structural form in the refrigerant circulation system provided by the invention;

fig. 9 is a top view of an energy storage module in a structural form in the refrigerant circulation system provided by the invention;

fig. 10 is a front view of an energy storage module in another structural form in the refrigerant circulation system provided by the invention;

FIG. 11 is a top view of an energy storage module in a structural form in a refrigerant circulation system according to the present invention;

fig. 12 shows an enlarged view at a in fig. 11;

fig. 13 is a schematic diagram showing proportions of energy storage materials with different phase change point temperatures in an energy storage module of a refrigerant circulation system provided by the invention.

In the figure, 1, a compressor; 2. an outdoor heat exchange part; 3. an indoor heat exchange part; 4. an outdoor throttle element; 5. an indoor throttle element; 6. a four-way valve; 7. an energy storage module; 71. a heat storage/cooling section; 72. a first heat exchange flow path; 73. a second heat exchange flow path; 74. a first heat exchange tube; 75. a second heat exchange tube; 76. a heat dissipation air duct; 77. a first fin structure; 78. a second fin structure; 79. a housing; 8. a first pipeline; 81. a first pipe section; 9. a second pipeline; 91. a second pipe section; 10. a first three-way valve; 11. a second three-way valve; 12. a first connection section; 13. a second connection section; 14. a third connecting section; 15. a fourth connecting section; 16. a first branch; 17. a second branch; 18. driving a pump; 19. a first flow control valve; 20. a second flow control valve; 21. a gas-liquid separator; 22. an outdoor gas-liquid separator; 23. a blower; 24. a first switching valve; 25. a second switching valve; 26. a third switching valve; 27. and a fourth switching valve.

Detailed Description

The present invention is described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. The present invention will be fully understood by those skilled in the art without the details described herein. Well-known methods, procedures, flows, and components have not been described in detail so as not to obscure the nature of the invention.

Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

The present application provides a refrigerant circulation system and a control method thereof, as shown in fig. 1, the refrigerant circulation system includes a compressor 1, an outdoor heat exchange portion 2, an indoor heat exchange portion 3 and a throttling device connected by pipelines, the outdoor heat exchange portion is disposed in an outdoor unit, and may include one outdoor heat exchanger, or may include a plurality of parallel outdoor heat exchangers, the indoor heat exchange portion 3 is disposed in an indoor unit, and may include one indoor heat exchanger, or may include a plurality of parallel indoor heat exchangers, and the throttling device includes, for example, an indoor throttling element 5 disposed in the indoor unit and an outdoor throttling element 4 disposed in the outdoor unit. The compressor, the outdoor heat exchange portion 2, the indoor heat exchange portion 3, and the throttle device can form a normal circulation flow path of the refrigerant circulation system. The refrigerant circulation system can be a single refrigeration system, a single heating system or a refrigerating and heating system, and when the refrigerant circulation system is a refrigerating and heating system, the refrigerant circulation system further comprises a four-way valve 6 which can be used for reversing so that the refrigerant circulation system can be switched between a heating mode and a refrigerating mode.

Further, the refrigerant circulation system further comprises an energy storage module 7, the energy storage module 7 comprises a heat storage/cooling part 71, a first heat exchange flow path 72 and a second heat exchange flow path 73 which can exchange heat with the heat storage/cooling part 71, the heat storage/cooling here refers to cold storage heat energy, the cold storage/cooling part is a cold storage part when the cold storage/cooling part is used for cold storage, the heat storage part is preferably used for heat storage, the heat storage/cooling part 71 is filled with a phase change energy storage material, the energy storage module 7 further comprises two heat exchange pipes penetrating through the phase change energy storage material, and inner cavities of the two heat exchange pipes respectively form the first heat exchange flow path 72 and the second heat exchange flow path 73. A connection line between the exhaust port of the compressor 1 and the heating operation refrigerant inlet of the indoor heat exchange portion 3 is defined as a first line 8, and here, the heating operation refrigerant inlet of the indoor heat exchange portion 3 is a refrigerant inlet when the refrigerant circulation system is operated to heat, and in the embodiment shown in fig. 1, the first line 8 is connected between the four-way valve 6 and the indoor heat exchange portion 3. The connecting line connecting the heating operation refrigerant outlet of the indoor heat exchange portion 3 and the heating operation refrigerant inlet of the outdoor heat exchange portion 2 is defined as a second line 9, where the heating operation refrigerant outlet of the indoor heat exchange portion 3 is a refrigerant outlet when the refrigerant circulation system is operating for heating, and the heating operation refrigerant inlet of the outdoor heat exchange portion 2 is a refrigerant inlet when the refrigerant circulation system is operating for heating, in the embodiment shown in fig. 1, the second line 9 is connected between the indoor heat exchange portion 3 and the outdoor heat exchange portion 2. The first end of the first heat exchange flow path 72 is connected with the first pipeline 8, the second end is connected with the second pipeline 9, the first end of the second heat exchange flow path 73 is connected with the first pipeline 8, and the second end is connected with the second pipeline 9, so that two ends of the two heat exchange flow paths are connected into a main refrigerant pipeline of a refrigerant circulation system, and the two heat exchange flow paths can respectively and independently participate in refrigerant circulation, for example, when the refrigerant circulation system is used for defrosting, one heat exchange flow path is used for supplying heat to the indoor, the other heat exchange flow path participates in defrosting of an outdoor heat exchanger, so that mutually independent refrigerant circulation is formed indoors and outdoors, the comfort degree of indoor temperature is guaranteed, the defrosting efficiency (specific introduction is guaranteed later), and in addition, as the two heat exchange flow paths are connected into the main refrigerant pipeline of the refrigerant circulation system, the two heat exchange flow paths can both participate in heating and refrigerating of the refrigerant circulation system and heat storage of the energy storage module 7, and the utilization rate of the energy storage module 7 is improved (specific introduction is later).

Further preferably, the refrigerant circulation system is configured such that the first pipe section 81 of the first pipe 8 between the first end of the first heat exchange flow path 72 and the first end of the second heat exchange flow path 73 selectively circulates and is blocked, the second pipe section 91 of the second pipe 9 between the second end of the first heat exchange flow path 72 and the second end of the second heat exchange flow path 73 selectively circulates and is blocked, and the circulation and blocking of the first pipe section 81 and the second pipe section 91 can be achieved by providing a switch control valve such as a two-way valve, a three-way valve, or the like. Further preferably, the control valve is configured such that the discharge port of the compressor 1 is selectively connected to the first heat exchange flow path 72 or the first pipe section 81, the heating operation refrigerant inlet of the indoor heat exchange portion 3 is selectively connected to the second heat exchange flow path 73 or the first pipe section 81, and in a preferred embodiment, the refrigerant circulation system further includes a first three-way valve 10 and a second three-way valve 11, wherein a first valve port of the first three-way valve 10 is connected to the discharge port of the compressor 1, a second valve port is connected to the first heat exchange flow path 72, and a third valve port is connected to the first pipe section 81; the first port of the second three-way valve 11 is connected to the heating operation refrigerant inlet of the indoor heat exchange portion 3, the second port is connected to the second heat exchange flow path 73, and the third port is connected to the first pipe section 81, however, the first three-way valve 10 and the second three-way valve 11 may be replaced by a combination of two-way valves, and the above functions can be realized as well. The second pipe section 91 is provided with a first switching valve 24 for controlling the flow and shut-off of the second pipe section 91.

Further preferably, a first end of the first heat exchange flow path 72 is connected to the first pipeline 8 through the first connecting section 12, a second end of the first heat exchange flow path 72 is connected to the second pipeline 9 through the second connecting section 13, a first end of the second heat exchange flow path 73 is connected to the first pipeline 8 through the third connecting section 14, a second end of the second heat exchange flow path 73 is connected to the second pipeline 9 through the fourth connecting section 15, the first connecting section 12 is connected to the first branch 16, the second connecting section 13 is connected to the fourth connecting section 15, the second branch 17 is connected to the second branch 13, and the second switch valve 25 and the third switch valve 26 are respectively arranged on the first branch 16 and the second branch 17, so that the refrigerant circulation system can realize more changeable flow paths, and the refrigerant circulation system can have more abundant functions.

Further preferably, the refrigerant circulation system further includes a refrigerant driving device for driving the refrigerant flowing in the second heat exchange flow path 73, for example, the refrigerant driving device may be a driving pump 18, where the driving pump 18 is preferably disposed on the fourth connecting section 15, and in addition, the first flow control valve 19 is disposed on the second connecting section 13, and the second flow control valve 20 is disposed on the fourth connecting section 15, so that a refrigerant flow path with more variability can be formed in the refrigerant circulation system through opening adjustment of the first flow control valve 19 and the second flow control valve 20, so as to enrich functions of the refrigerant circulation system (which will be described later). In order to further ensure the operational reliability of the system, the fourth connecting section 15 is further provided with a gas-liquid separator 21, preferably, in a direction away from the second heat exchange flow path 73, the driving pump 18, the gas-liquid separator 21 and the second flow control valve 20 are sequentially arranged, and an intersection point of the second branch 17 and the fourth connecting section 15 is disposed closer to the second heat exchange flow path 73 than the driving pump 18, and further preferably, a fourth switch valve 27 is further disposed between an intersection point of the second branch 17 and the fourth connecting section 15 and the driving pump 18, and the fourth switch valve 27 is normally in an open state. The intersection of the second branch 17 and the second connecting section 13 is located closer to the first heat exchange flow path 72 than the first flow control valve 19.

The refrigerant circulation system provided by the application has a plurality of modes such as a conventional heating mode, a defrosting mode, a rapid heating mode, a heating heat storage mode, a low-load mode, an energy storage mode and the like, and a user can select a proper mode to operate according to actual demands, and the refrigerant circulation system can also perform automatic mode switching.

Specifically, when the refrigerant circulation system starts heating, if the indoor environment temperature is higher, for example, the indoor environment temperature TA is greater than or equal to the first predetermined temperature, which may be a fixed value or may be determined according to the indoor environment target temperature, for example, the first predetermined temperature is the indoor environment target temperature TAs- Δt1, the preferred range of Δt1 is 2 to 4 ℃, and more preferably 3 ℃, the auxiliary starting by the energy storage module 7 is not needed, or when the temperature of the heat storage/cooling portion 71 is lower, for example, the temperature TS of the heat storage/cooling portion 71 is less than or equal to the second predetermined temperature, which may be a fixed value or may be determined according to Tcond, the Tcond is a condensation temperature during the heating operation of the indoor heat exchanger, for example, the second predetermined temperature is tcond+Δt2, the preferred range of Δt2 is 4 to 6 ℃, and more preferably 5 ℃, the energy storage module 7 is not needed, in which case in the refrigerant circulation system operates in a conventional heating mode, in which the heat storage module 7 is controlled to form a heat storage loop, not to participate in the refrigerant circulation system.

In the embodiment shown in fig. 2, the specific control steps are: the exhaust port of the control compressor 1 is connected with a first pipe section 81, that is, ac communication of a first three-way valve 10, the heating operation refrigerant inlet of the indoor heat exchange part 3 is connected with the first pipe section 81, that is, ac communication of a second three-way valve 11, the second pipe section 91 is circulated, that is, the first switching valve 24 is opened, the first flow control valve 19 and the second flow control valve 20 are in a fully closed state, the second switching valve 25 and the third switching valve 26 are preferably also in an opened state, and the high-temperature and high-pressure refrigerant coming out of the compressor 1 sequentially passes through the four-way valve 6, the indoor heat exchange part 3, the indoor throttling element 5, the outdoor throttling element 4, the outdoor heat exchange part 2, the four-way valve 6 and the outdoor gas-liquid separator 22 and then returns to the compressor 1 to complete the heating cycle.

If the indoor environment temperature is low and the temperature of the heat storage/cooling unit 71 is high, for example, TA is smaller than the first predetermined temperature and TS is greater than the second predetermined temperature, the energy storage module 7 may be used for auxiliary starting, and the refrigerant circulation system operates in a rapid heating mode at this time, in which the first heat exchange flow path 72 and the second heat exchange flow path 73 are controlled to be connected in parallel and then form a heating loop with the compressor 1, the outdoor heat exchange unit 2 and the indoor heat exchange unit 3, so that heat on the two heat exchange flow paths can be used for participating in heating, thereby increasing the indoor heating speed.

In the embodiment shown in fig. 3, the specific control steps are that the exhaust port of the compressor 1 is controlled to be connected with the first heat exchange flow path 72, that is, the bc of the first three-way valve 10 is communicated, the heating operation refrigerant inlet of the indoor heat exchange portion 3 is connected with the second heat exchange flow path 73, that is, the bc of the second three-way valve 11 is communicated, the second pipe section 91 is communicated, that is, the first switching valve 24 is opened, the second switching valve 25 and the third switching valve 26 are both opened, the first flow control valve 19 is in a fully closed state, the second flow control valve 20 is in a fully opened state, the driving pump 18 is started to operate, the indoor throttling element 5 is fully opened, and the high-temperature and high-pressure refrigerant coming out of the compressor 1 flows into the indoor unit through the four-way valve 6, and releases heat in the indoor heat exchange portion 3. The refrigerant flowing through the point F is divided into two parts, one part is throttled by the outdoor throttling element 4 and becomes low-temperature low-pressure refrigerant, and the refrigerant enters the outdoor heat exchange part 2 to absorb heat and then returns to the compressor 1; a part of the refrigerant is driven by the drive pump 18 and is boosted, and then passes through the first heat exchange flow path 72 and the second heat exchange flow path 73 of the accumulator module 7, absorbs heat in the accumulator module 7, becomes a high-temperature and high-pressure refrigerant again, and is merged with the high-temperature and high-pressure refrigerant from the compressor 1 from the points a and B, respectively, and enters the indoor heat exchange portion 3 together to release heat.

In the conventional heating module or the rapid heating mode, when the indoor environment temperature is high and the temperature of the heat/cold portion 71 is low, for example, the indoor environment temperature TA is greater than the third predetermined temperature and the temperature of the heat/cold portion is TS is less than the fourth predetermined temperature, the third predetermined temperature may be a constant value or may be determined according to the indoor environment target temperature, for example, the third predetermined temperature is the indoor environment target temperature TAs- Δt3, the preferred range of Δt3 is 2 to 4 ℃, and more preferably 3 ℃, the fourth predetermined temperature may be a constant value or may be determined according to the target heat storage temperature TSs, for example, the preferred range of the fourth predetermined temperature is 9 to 11 ℃, and more preferably 10 ℃, and the refrigerant circulation system may be controlled to enter the heating heat storage mode, in which the indoor heat exchange portion 3 is controlled to be connected in parallel with the first heat exchange flow path 72 and the second heat exchange flow path 73, so that the refrigerant discharged from the compressor 1 enters the indoor heat exchange portion 3 to maintain the indoor temperature, and the other portion enters the first heat exchange flow path 72 and the second heat exchange flow path 73 to perform heat storage of the heat exchange flow path 71.

In the embodiment shown in fig. 4, the specific control steps are that the exhaust port of the compressor 1 is controlled to be connected to the first heat exchange flow path 72, that is, the bc of the first three-way valve 10 is turned on, the heating operation refrigerant inlet of the indoor heat exchange portion 3 is connected to the second heat exchange flow path 73, that is, the bc of the second three-way valve 11 is turned on, the second pipe segment 91 flows, that is, the first switch valve 24 is opened, the second switch valve 25 and the third switch valve 26 are both opened, the second flow control valve 20 is in a fully closed state, the refrigerant flow in the first heat exchange flow path 72 and the second heat exchange flow path 73 is adjusted by adjusting the opening of the first flow control valve 19, and the high-temperature and high-pressure refrigerant exiting the compressor 1 is divided into 3 portions at point a: a part of the refrigerant flows into the indoor unit through the first branch 16 and the second three-way valve 11, releases heat in the indoor heat exchange part 3 and throttles the heat, and becomes a supercooled refrigerant with medium pressure; the other two parts respectively enter the first heat exchange flow path 72 and the second heat exchange flow path 73, accumulate heat in the energy storage module 7, then merge at the point C, enter the second connecting section 13, merge with the refrigerant coming out of the indoor heat exchange part 3 at the point E, then pass through the outdoor throttling element 4 and the outdoor heat exchange part 2, absorb the heat, and then return to the compressor 1 to complete the heating cycle.

When the indoor environment temperature TA reaches or exceeds the indoor environment target temperature and the temperature TS of the heat storage/cooling portion 71 reaches or exceeds the target heat storage temperature, the refrigerant circulation system can be controlled to enter a low-load mode, in which the compressor 1 is controlled to be stopped, the first heat exchange flow path 72 and the second heat exchange flow path 73 are connected in parallel and then form a heating loop with the indoor heat exchange portion 3, that is, the compressor 1 does not work, the heat of the energy storage module 7 is only used for supplying heat to the indoor, when the temperature TS of the heat storage/cooling portion 71 and the indoor environment temperature TA meet the condition TS < ta+Δt5, the preferred range of Δt5 is 7 to 9 ℃, and further 8 ℃, and the refrigerant circulation system is controlled to exit the low-load mode and return to the conventional heating mode or the rapid heating mode.

In the embodiment shown in fig. 6, the specific control steps are: the compressor 1 is controlled to be shut down, the exhaust port of the compressor 1 is connected with the first pipe section 81, namely, the ac of the first three-way valve 10 is connected, the heating operation refrigerant inlet of the indoor heat exchange part 3 is connected with the second heat exchange flow path 73, namely, the bc of the second three-way valve 11 is connected, the second pipe section 91 is shut down, namely, the first switching valve 24 is closed, both the second switching valve 25 and the third switching valve 26 are opened, the first flow control valve 19 is in a fully closed state, the second flow control valve 20 is in a fully opened state, the driving pump 18 is started, the system maintains indoor heat load by means of heat in the energy storage module 7, the difference between the indoor air temperature and the comfortable temperature of a human body is small only by extremely small power consumption of the driving pump 18, and certain comfortableness is maintained, and of course, when the energy storage module 7 is arranged in the indoor unit, the driving pump 18 is not opened at this moment, and the indoor heat supply of the energy storage module 7 is realized by natural convection.

When the outdoor heat exchange part 2 of the refrigerant circulation system needs defrosting, the refrigerant circulation system is controlled to enter a defrosting mode, in the mode, the four-way valve 6 is controlled to change direction, the compressor 1, the outdoor heat exchange part 2 and the first heat exchange flow path 72 are controlled to form a defrosting loop, the indoor heat exchange part 3 and the second heat exchange flow path 73 are controlled to form a heating loop, two heat exchange loops which are mutually independent are formed, the first heat exchange flow path 72 is utilized to conduct auxiliary defrosting, the second heat exchange flow path 73 is utilized to ensure indoor heating, and defrosting efficiency is improved while indoor use comfort is ensured.

In the embodiment shown in fig. 5, the specific control steps are: the exhaust port of the control compressor 1 is connected with the first heat exchange flow path 72, that is, the bc of the first three-way valve 10 is connected, the heating operation refrigerant inlet of the indoor heat exchange part 3 is connected with the second heat exchange flow path 73, that is, the bc of the second three-way valve 11 is connected, the second pipe section 91 is cut off, that is, the first switch valve 24 is closed, the second switch valve 25 and the third switch valve 26 are both closed, the first flow control valve 19 is in a fully opened state, the refrigerant flow in the second heat exchange flow path 73 is regulated by regulating the opening of the second flow control valve 20, the driving pump 18 is started at the same time, and the whole system is divided into two parts which do not interfere with each other: a heating circuit and a defrosting circuit. In the defrosting circuit, the high-temperature and high-pressure refrigerant coming out of the compressor 1 is entirely introduced into the outdoor heat exchange part to release heat for defrosting, then is changed into low-temperature and low-pressure refrigerant through the outdoor throttle element 4 and the first flow control valve 19, is introduced into the first heat exchange flow path 72 to absorb heat, and then is returned to the compressor 1 to complete the defrosting process. In the heating circuit, the indoor throttle element 5 is fully opened, the driving pump 18 drives the liquid refrigerant in the gas-liquid separator 21, heat is absorbed in the second heat exchange flow path 73, heat is released in the indoor heat exchange portion 3, and then the refrigerant enters the gas-liquid separator 21, completing the heating cycle. In the heating circuit, the refrigerant does not need to be throttled, and only flow resistance exists in the circuit, so that the power consumption for driving the pump 18 is small. In the mode, the defrosting process and the heating process are performed simultaneously, and all the high-temperature and high-pressure refrigerant discharged by the compressor 1 enters the outdoor heat exchange part 2 for defrosting, so that the defrosting time is greatly shortened, heat is absorbed in the energy storage module 7 with higher temperature after throttling, and the energy efficiency of the system is improved; meanwhile, the indoor heat supply is not interrupted, and the indoor comfort is ensured.

Further, the refrigerant circulation system also has an energy storage mode, in which the first heat exchange flow path 72 and the second heat exchange flow path 73 are controlled to be connected in parallel and then form an energy storage loop with the compressor 1 and the outdoor heat exchange portion 2. The energy storage mode comprises a heat storage mode and a cold storage mode, wherein in the heat storage mode, refrigerant discharged by the compressor 1 firstly enters the energy storage module 7 after passing through the four-way valve 6, then enters the outdoor heat exchange part 2, the four-way valve 6 reverses direction in the cold storage mode, and refrigerant discharged by the compressor 1 firstly enters the outdoor heat exchange part 2 after passing through the four-way valve 6, then enters the energy storage module 7. The refrigerant circulation system can operate the cold accumulation mode in a period with less energy utilization at night, cheaper electricity price and lower night temperature, and can operate the heat accumulation mode in a period with higher outdoor temperature at noon and higher system energy efficiency or a period with lower night electricity price so as to realize reasonable and efficient utilization of energy.

Fig. 7 shows a refrigerant flow path in the heat storage mode, and specifically includes the following control steps: the exhaust port of the control compressor 1 is connected to the first heat exchanging channel 72, that is, the bc of the first three-way valve 10 is turned on, the heating operation refrigerant inlet of the indoor heat exchanging unit 3 is connected to the first pipe segment 81, that is, the ac of the second three-way valve 11 is turned on, the second pipe segment 91 is turned off, that is, the first on-off valve 24 is turned off, both the second on-off valve 25 and the third on-off valve 26 are turned on, the second flow rate control valve 20 is in a fully closed state, the opening degree of the first flow rate control valve 19 is adjusted to adjust the refrigerant flow rates in the first heat exchanging channel 72 and the second heat exchanging channel 73, at this time, the refrigerant does not pass through the indoor heat exchanging unit 3, passes through only the first heat exchanging channel 72 and the second heat exchanging channel 73, releases and stores heat in the accumulator module 7, and then passes through the first flow rate control valve 19, the outdoor throttle element 4, the outdoor heat exchanging unit 2, the four-way valve 6, and the outdoor gas-liquid separator 22, and returns to the compressor 1.

The structure of the energy storage module 7 is shown in fig. 8 and 9, and the energy storage module comprises a shell 79 and a heat storage/cooling part 71 arranged in the shell 79, wherein the heat storage/cooling part 71 is filled with a phase change energy storage material, a first heat exchange tube 74 and a second heat exchange tube 75 are arranged in the phase change energy storage material in a penetrating way, the inner cavities of the two heat exchange tubes respectively form a first heat exchange flow path 72 and a second heat exchange flow path 73, the first heat exchange tube 74 and the second heat exchange tube 75 are preferably in a roundabout coil structure, and the two heat exchange tubes are arranged in parallel. The housing 79 is preferably made of a heat insulating material, or a heat insulating structure layer is further provided outside the housing 79.

Further preferably or alternatively, as shown in fig. 10 and 11, a heat radiation air duct 76 penetrating the heat storage/cooling portion is provided in the heat storage/cooling portion 71, and further preferably, an air flow driving device for forming an air flow in the heat radiation air duct 76 is further included, and the air flow driving device may be, for example, a fan 23, and the fan 23 is preferably provided at one end of the heat radiation air duct 76. In this way, the energy storage module 7 can also participate in air heat exchange, and in order to improve the heat exchange effect, it is further preferable that, as shown in fig. 12, a first fin structure 77 is provided on the air duct wall of the heat dissipation air duct 76, and a second fin structure 78 is provided on the housing 79.

The energy storage module 7 may be provided in the indoor unit, the outdoor unit, or both, and the structure shown in fig. 10 to 12 is preferably adopted when the energy storage module 7 is provided in the indoor unit, so that the energy storage module 7 can participate in heat exchange of indoor air, and the structure shown in fig. 8 and 9 is preferably adopted when the energy storage module 7 is provided in the outdoor unit.

Further preferably, a plurality of phase change energy storage materials are provided in the heat storage/cooling portion 71, and when the refrigerant circulation system is a single refrigeration system, the phase change point temperature of the phase change energy storage materials is preferably in a range of 10 ℃ to 20 ℃. When the refrigerant circulation system is a single heating system, the phase change point temperature range of the phase change energy storage material is preferably 35 ℃ to 65 ℃, and when the refrigerant circulation system is a heating and refrigerating system, the phase change point temperature range of the phase change energy storage material is preferably 10 ℃ to 60 ℃. The proportion of the phase change energy storage materials with different phase change point temperatures is preferably as shown in fig. 13, preferably, the proportion of the phase change energy storage materials with the phase change point temperature of about tevap+Δt6 and the phase change energy storage materials with the phase change point temperature of about Tcond- Δt7 is relatively high, wherein Tevap is the evaporation temperature during refrigeration, tcond is the condensation temperature during heating, and the preferred ranges of Δt6 and Δt7 are 5 to 15 ℃, and more preferably 10 ℃.

The heat exchange flow paths capable of exchanging heat with the heat storage/cooling part are included in the energy storage module 7 of the refrigerant circulation system, and two ends of the two heat exchange flow paths are connected into the main refrigerant pipeline of the refrigerant circulation system, so that the two heat exchange flow paths can respectively and independently participate in refrigerant circulation, for example, when the refrigerant circulation system is defrosting, one heat exchange flow path is used for supplying heat to the indoor space, the other heat exchange flow path participates in defrosting of the outdoor heat exchanger, so that the indoor space and the outdoor space form mutually independent refrigerant circulation, the comfort of the indoor temperature is ensured, the defrosting efficiency of the refrigerant circulation system is ensured, and in addition, the two heat exchange flow paths are connected into the main refrigerant pipeline of the refrigerant circulation system, so that the two heat exchange flow paths can both participate in heating and refrigerating of the refrigerant circulation system and heat storage of the energy storage module 7, and the utilization rate of the energy storage module 7 is improved.

It is easy to understand by those skilled in the art that the above preferred embodiments can be freely combined and overlapped without conflict.

It will be understood that the above-described embodiments are merely illustrative and not restrictive, and that all obvious or equivalent modifications and substitutions to the details given above may be made by those skilled in the art without departing from the underlying principles of the invention, are intended to be included within the scope of the appended claims.

Claims

1. The refrigerant circulation system is characterized by comprising a compressor, an outdoor heat exchange part, an indoor heat exchange part and a throttling device which are connected through pipelines, wherein the pipelines comprise a first pipeline for connecting an exhaust port of the compressor with a heating operation refrigerant inlet of the indoor heat exchange part, and a second pipeline for connecting a heating operation refrigerant outlet of the indoor heat exchange part with a heating operation refrigerant inlet of the outdoor heat exchange part, the refrigerant circulation system further comprises an energy storage module, the energy storage module comprises a heat storage/cooling part, a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path and the first end of the second heat exchange flow path are connected with the first pipeline, and the second end of the first heat exchange flow path and the second heat exchange flow path are connected with the second pipeline.

2. The refrigerant circulation system of claim 1, wherein the first line selectively communicates and closes a first tube segment between a first end of the first heat exchange flow path and a first end of the second heat exchange flow path; and/or the number of the groups of groups,

the second conduit selectively communicates and is blocked at a second tube segment between the second end of the first heat exchange flow path and the second end of the second heat exchange flow path.

3. The refrigerant circulation system according to claim 2, wherein a discharge port of the compressor is selectively connected to the first heat exchange flow path or the first pipe section; and/or the number of the groups of groups,

and the heating operation refrigerant inlet of the indoor heat exchange part is selectively connected with the second heat exchange flow path or the first pipe section.

4. The refrigerant circulation system according to claim 2, wherein,

the refrigerant circulation system further comprises a first three-way valve and a second three-way valve, wherein a first valve port of the first three-way valve is connected with an exhaust port of the compressor, a second valve port is connected with the first heat exchange flow path, and a third valve port is connected with the first pipe section;

a first valve port of the second three-way valve is connected with a heating operation refrigerant inlet of the indoor heat exchange part, a second valve port is connected with the second heat exchange flow path, and a third valve port is connected with the first pipe section; and/or the number of the groups of groups,

5. The refrigerant cycle system as set forth in claim 3, wherein a first end of said first heat exchange flow path is connected to said first pipe via a first connection segment, a second end of said first heat exchange flow path is connected to said second pipe via a second connection segment, a first end of said second heat exchange flow path is connected to said first pipe via a third connection segment, and a second end of said second heat exchange flow path is connected to said second pipe via a fourth connection segment;

6. The refrigerant circulation system according to claim 5, wherein a second switching valve is provided on the first branch; and/or a third switch valve is arranged on the second branch.

7. The refrigerant circulation system according to claim 5, further comprising a refrigerant driving device for driving the flow of the refrigerant on the second heat exchanging flow path.

8. The refrigerant circulation system according to claim 7, wherein the refrigerant driving device is provided on the fourth connection section.

9. The refrigerant circulation system according to claim 5, wherein the second connection section is provided with a first flow control valve; and/or the number of the groups of groups,

and the fourth connecting section is provided with a gas-liquid separator.

10. The refrigerant cycle system according to claim 1, wherein a heat radiation air duct penetrating the heat storage/cooling portion is provided in the heat storage/cooling portion.

11. The refrigerant circulation system according to claim 10, wherein the accumulator module further includes an air flow driving device for forming an air flow in the heat radiation air duct.

12. The refrigerant circulating system as set forth in claim 10, wherein a first fin structure is provided on an air duct wall of said heat dissipation air duct; and/or the number of the groups of groups,

13. Refrigerant cycle system according to one of the claims 1 to 12, characterized in that the outdoor heat exchange part is arranged in an outdoor unit, the indoor heat exchange part is arranged in an indoor unit, and the energy storage module is arranged in the outdoor unit and/or the indoor unit.

14. The refrigerant circulation system according to any one of claims 1 to 12, wherein a plurality of phase change energy storage materials are provided in the heat storage/cooling portion,

15. The control method of a refrigerant circulation system according to one of claims 1 to 14, further comprising a four-way valve, wherein the refrigerant circulation system has a conventional heating mode in which the compressor, an outdoor heat exchange portion, and an indoor heat exchange portion are controlled to form a heating circuit; and/or the number of the groups of groups,

16. The control method according to claim 15, wherein the indoor ambient temperature is TA, the temperature of the heat storage/cooling portion is TS, when the refrigerant circulation system starts heating, it is determined whether the indoor ambient temperature TA and the temperature TS of the heat storage/cooling portion satisfy TA less than a first predetermined temperature and TS greater than a second predetermined temperature, if yes, the refrigerant circulation system is controlled to operate a rapid heating mode, otherwise, a normal heating mode is operated; and/or the number of the groups of groups,

judging whether the indoor environment temperature TA and the temperature TS of the heat storage/cold part meet the conditions that TA is larger than a third preset temperature and TS is smaller than a fourth preset temperature in the conventional heating mode or the rapid heating mode, and if yes, controlling the refrigerant circulation system to enter a heating heat storage mode; and/or the number of the groups of groups,

in the low load mode, when the temperature TS of the heat storage/cooling part and the indoor environment temperature TA meet the condition TS < TA+DeltaT5, the refrigerant circulation system is controlled to exit the low load mode.

17. The control method according to claim 16, characterized in that the first predetermined temperature is an indoor environment target temperature TAS- Δt1; and/or the number of the groups of groups,

the second preset temperature is Tcond+DeltaT2, wherein Tcond is the condensation temperature of the indoor heat exchanger during heating operation; and/or the number of the groups of groups,

18. The control method of refrigerant circulation system according to claim 9, further comprising a four-way valve, wherein the refrigerant circulation system has a conventional heating mode in which the compressor, the outdoor heat exchange portion, and the indoor heat exchange portion are controlled to form a heating circuit; and/or the number of the groups of groups,

the refrigerant circulation system is provided with an energy storage mode, and in the energy storage mode, the first heat exchange flow path and the second heat exchange flow path are controlled to be connected in parallel and then form an energy storage loop together with the compressor and the outdoor heat exchange part;

Under the conventional heating mode, an exhaust port of the compressor is controlled to be connected with the first pipe section, a heating operation refrigerant inlet of the indoor heat exchange part is connected with the first pipe section, the second pipe section circulates, and the first flow control valve and the second flow control valve are in a fully closed state; and/or the number of the groups of groups,

in the rapid heating mode, an exhaust port of the compressor is controlled to be communicated with the first heat exchange flow path, a heating operation refrigerant inlet of the indoor heat exchange part is controlled to be communicated with the second heat exchange flow path, the second pipe section is controlled to flow, the first branch and the second branch are opened, the first flow control valve is in a fully closed state, and the second flow control valve is in a fully opened state; and/or the number of the groups of groups,

in the heating and heat storage mode, an exhaust port of the compressor is controlled to be communicated with the first heat exchange flow path, a heating operation refrigerant inlet of the indoor heat exchange part is connected with the second heat exchange flow path, the second pipe section flows, the first branch and the second branch are opened, the second flow control valve is in a fully closed state, and the refrigerant flow in the first heat exchange flow path and the second heat exchange flow path is regulated by regulating the opening of the first flow control valve; and/or the number of the groups of groups,

In the defrosting mode, an exhaust port of the compressor is controlled to be communicated with the first heat exchange flow path, a heating operation refrigerant inlet of the indoor heat exchange part is controlled to be communicated with the second heat exchange flow path, the second pipe section is cut off, the first branch and the second branch are closed, the first flow control valve is in a full-open state, and the refrigerant flow in the second heat exchange flow path is regulated by regulating the opening degree of the second flow control valve; and/or the number of the groups of groups,

and in the energy storage mode, an exhaust port of the compressor is controlled to be communicated with the first heat exchange flow path, a heating operation refrigerant inlet of the indoor heat exchange part is controlled to be communicated with the first pipe section, the second pipe section is cut off, the first branch and the second branch are opened, the second flow control valve is in a fully closed state, and the refrigerant flow in the first heat exchange flow path and the second heat exchange flow path is regulated by regulating the opening of the first flow control valve.

19. The control method according to claim 18, wherein a refrigerant driving device is provided on the fourth connection section, the control method comprising:

in the low-load mode, controlling the refrigerant driving device to be in an on or off state;

and/or the number of the groups of groups,