CN115899887A

CN115899887A - Air conditioning system and control method and control device thereof

Info

Publication number: CN115899887A
Application number: CN202211425699.7A
Authority: CN
Inventors: 张仕强; 袁帆; 陈敏
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-04-04

Abstract

The invention relates to an air conditioning system and a control method and a control device thereof, wherein the air conditioning system comprises a compressor (101), an outdoor heat exchanger (105), an indoor heat exchanger (301), an energy accumulator (201) and a valve assembly, wherein the first end of the energy accumulator (201) is respectively communicated with the outdoor heat exchanger (105) and the air outlet of the compressor (101), and the second end of the energy accumulator (201) is respectively communicated with the air inlet of the indoor heat exchanger (301) and the air inlet of the compressor (101); the valve assembly is connected with the compressor (101), the outdoor heat exchanger (105), the indoor heat exchanger (301) and the energy accumulator (201), the valve assembly is configured to control the flow direction of a refrigerant and/or the on-off of a connecting pipeline so as to adjust the state of the energy accumulator (201) and realize the switching of the air conditioning system among different working modes, and the state of the energy accumulator (201) comprises a non-working state, a cold accumulation state, a cold release state, a heat accumulation state and a heat release state.

Description

Air conditioning system and control method and control device thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method and a control device thereof.

Background

The heating defrosting of the multi-split air conditioner is a ubiquitous problem in the air conditioning industry, the frequent defrosting of the air conditioner can cause the poor heating effect of the whole body, the indoor temperature is reduced in the defrosting process, and the use comfort of a user is poor.

In order to solve the problem of air conditioning heating defrosting, a plurality of coping measures are available at present, wherein a defrosting system combining a heat storage module is gradually raised in the air conditioning industry, namely heat storage is carried out during heating operation, and heat release is carried out during defrosting, so that fluctuation of indoor temperature is reduced. However, the operation mode of the heat storage module is single, the diversified requirements of users cannot be met, the pipeline design is complex, and bad experience is caused to the users.

It is noted that the information disclosed in this background section 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.

Disclosure of Invention

The embodiment of the invention provides an air conditioning system, a control method and a control device thereof, and solves the problem that the air conditioning system in the related art cannot meet the diversified demands of users.

According to a first aspect of the present invention, there is provided an air conditioning system comprising:

a compressor;

an outdoor heat exchanger;

an indoor heat exchanger;

the first end of the energy accumulator is respectively communicated with the air outlet of the outdoor heat exchanger and the air outlet of the compressor, and the second end of the energy accumulator is respectively communicated with the air inlet of the indoor heat exchanger and the air inlet of the compressor; and

the valve assembly is connected with the compressor, the outdoor heat exchanger, the indoor heat exchanger and the energy accumulator, and is configured to control the flow direction of a refrigerant and/or the on-off of a connecting pipeline so as to adjust the state of the energy accumulator and realize the switching of the air conditioning system among different working modes, and the state of the energy accumulator comprises a non-working state, a cold storage state, a cold release state, a heat storage state and a heat release state.

In some embodiments, the valve assembly includes a first control valve and a first throttling element connected in parallel between the first end of the accumulator and the outdoor heat exchanger.

In some embodiments, the valve assembly includes a second control valve disposed on a connection line between the indoor heat exchanger and the first connection point on a line connecting the outdoor heat exchanger with the first control valve and the first throttle member.

In some embodiments, the valve assembly includes a third control valve disposed on the connecting line between the first end of the accumulator and the discharge port of the compressor.

In some embodiments, the valve assembly includes a fourth control valve disposed on the connection line between the second end of the accumulator and the inlet of the compressor.

In some embodiments, the valve assembly includes a second flow restriction, a first end of the second flow restriction communicating with the second end of the accumulator, and a second end of the second flow restriction communicating with the indoor heat exchanger and the outdoor heat exchanger, respectively.

In some embodiments, the valve assembly includes a third orifice member disposed on the connection line between the outdoor heat exchanger and the indoor heat exchanger.

In some embodiments, the valve assembly comprises a four-way valve comprising a first port in communication with the discharge port of the compressor, a second port in communication with the outdoor heat exchanger, a third port in communication with the intake port of the compressor, and a fourth port in communication with the indoor heat exchanger.

In some embodiments, the air conditioning system further includes a subcooler disposed between the outdoor heat exchanger and the indoor heat exchanger, and the subcooler is in communication with the air intake of the compressor.

In some embodiments, the valve assembly includes a first control valve, a second control valve, a third control valve, a fourth control valve, a first throttle, a second throttle, a third throttle and a four-way valve, the first control valve and the first throttle are connected in parallel between a first end of the accumulator and a first connection point, the first connection point is communicated with the outdoor heat exchanger, the second control valve is disposed on a connection line between the first connection point and the indoor heat exchanger, the third control valve is disposed on a connection line between the first end of the accumulator and an exhaust port of the compressor, the fourth control valve is disposed on a connection line between a second end of the accumulator and an air inlet of the compressor, the first end of the second throttle is communicated with a second end of the accumulator, the second end of the second throttle is communicated with the indoor heat exchanger and the outdoor heat exchanger, the third throttle is disposed on a connection line between the outdoor heat exchanger and the first connection point, the four-way valve includes a first interface, a second interface, a third interface and a fourth interface, the first interface is communicated with an exhaust port of the compressor, the second interface is communicated with the outdoor heat exchanger, the third interface is communicated with the indoor heat exchanger, and the four-way valve includes a gas inlet of the compressor.

According to a second aspect of the present invention, there is provided a control method based on the air conditioning system, including:

determining the working mode of the air conditioning system;

and controlling the action of a valve component in the air conditioning system and the state of the energy accumulator according to a preset control strategy and based on the working mode.

In some embodiments, determining an operating mode of the air conditioning system comprises:

in the time period when the power supply system has high electricity price, determining that the working mode of the air conditioning system is a mode corresponding to the state that the energy accumulator is in a non-working state, a cold quantity releasing state or a heat quantity releasing state;

and determining the working mode of the air conditioning system as a mode that the corresponding energy accumulator is in a non-working state, a cold storage state or a heat storage state when the power supply system is in a low electricity price period.

In some embodiments, determining the operating mode of the air conditioning system comprises:

detecting whether energy is stored in the energy accumulator;

and determining the working mode of the air conditioning system according to the detection result.

According to a third aspect of the present invention, there is provided a control method based on the air conditioning system, including:

determining the working mode of the air conditioning system;

and controlling the actions of a first control valve, a second control valve, a third control valve, a fourth control valve, a first throttling element, a second throttling element, a third throttling element and a four-way valve in the air conditioning system and the states of an outdoor heat exchanger, an indoor heat exchanger and an energy accumulator according to a preset control strategy and based on the working mode.

In some embodiments, controlling the actions of the first control valve, the second control valve, the third control valve, the fourth control valve, the first throttle, the second throttle, the third throttle, and the four-way valve and the states of the outdoor heat exchanger, the indoor heat exchanger, and the accumulator in the air conditioning system according to a preset control strategy and based on the operation mode includes:

when the working mode is the conventional refrigeration mode, controlling the four-way valve to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the second control valve to be opened, and closing the first control valve, the third control valve and the fourth control valve; and

controlling the first throttling element and the second throttling element to be in a closed state, and controlling the third throttling element to be in an open state and the opening size to be adjustable;

wherein the indoor heat exchanger is used as an evaporator, the outdoor heat exchanger is used as a condenser, and the accumulator is closed.

In some embodiments, controlling the actions of the first, second, third, fourth, first, second, third, and four-way valves and the states of the outdoor heat exchanger, the indoor heat exchanger, and the accumulator in the air conditioning system according to a preset control strategy and based on the operation mode includes:

when the working mode is the complete cold accumulation mode, controlling the four-way valve to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the fourth control valve to be opened, and closing the first control valve, the third control valve and the second control valve; and

controlling the first throttling element and the third throttling element to be in an opening state, wherein the opening size is adjustable, and the second throttling element is in a closing state;

wherein the indoor heat exchanger is closed, the outdoor heat exchanger is used as a condenser, and the accumulator is used as an evaporator.

when the working mode is a refrigeration and cold accumulation mode, controlling the four-way valve to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the fourth control valve and the second control valve to be opened, and controlling the first control valve and the third control valve to be closed; and

wherein the indoor heat exchanger serves as an evaporator, the outdoor heat exchanger serves as a condenser, and the accumulator serves as an evaporator.

when the working mode is the supercooling cold release mode, controlling the four-way valve to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the first control valve to be opened, and controlling the third control valve, the fourth control valve and the second control valve to be closed; and

controlling the first throttling element to be in a closed state, and controlling the second throttling element and the third throttling element to be in an open state, wherein the size of an opening is adjustable;

wherein the indoor heat exchanger is used as an evaporator, the outdoor heat exchanger is used as a condenser, and the accumulator is used as a subcooler.

when the working mode is a condensing and cooling mode, controlling the four-way valve to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the third control valve to be opened, and controlling the first control valve, the fourth control valve and the second control valve to be closed; and

the first throttling piece and the third throttling piece are controlled to be in a closed state, the second throttling piece is in an open state, and the opening size is adjustable;

wherein the indoor heat exchanger is used as an evaporator, the outdoor heat exchanger is closed, and the accumulator is used as a condenser.

when the working mode is the parallel cold release mode, controlling the four-way valve to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the third control valve and the second control valve to be opened, and controlling the first control valve and the fourth control valve to be closed; and

the first throttling element is controlled to be in a closed state, the second throttling element and the third throttling element are both in an open state, and the opening size is adjustable;

wherein the indoor heat exchanger serves as an evaporator, and the outdoor heat exchanger and the accumulator both serve as condensers.

when the working mode is the conventional heating mode, controlling the four-way valve to be electrified, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

controlling the second control valve to be opened, and controlling the first control valve, the third control valve and the fourth control valve to be closed; and

wherein the indoor heat exchanger is used as a condenser, the outdoor heat exchanger is used as an evaporator, and the accumulator is closed.

when the working mode is the complete heat storage mode, controlling the four-way valve to be electrified, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

wherein the indoor heat exchanger is closed, the outdoor heat exchanger is used as an evaporator, and the accumulator is used as a condenser.

when the working mode is a heating and heat storage mode, the four-way valve is controlled to be powered on, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

wherein the indoor heat exchanger serves as a condenser, the outdoor heat exchanger serves as an evaporator, and the accumulator serves as a condenser.

when the working mode is a mixed heat release mode, controlling the four-way valve to be electrified, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

wherein the indoor heat exchanger serves as a condenser, the outdoor heat exchanger serves as an evaporator, and the accumulator serves as an evaporator.

when the working mode is the independent heat release mode, controlling the four-way valve to be electrified, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

controlling the first throttling element to be in an opening state, wherein the opening size is adjustable, and the second throttling element and the third throttling element are both in a closing state;

wherein the indoor heat exchanger is used as a condenser, the outdoor heat exchanger is closed, and the accumulator is used as an evaporator.

when the working mode is a defrosting mode, controlling the four-way valve to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

the first throttling element and the third throttling element are controlled to be in an opening state, the opening size is adjustable, and the second throttling element is controlled to be in a closing state;

According to a fourth aspect of the present invention, there is provided a control device of an air conditioning system, comprising:

a memory configured to store instructions;

and a processor coupled to the memory, the processor configured to implement the control method described above based on instructions stored by the memory.

According to a fifth aspect of the present invention, there is provided a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, which when executed by a processor, implement the control method described above.

Based on the technical scheme, the flow direction of the refrigerant can be changed and/or the on-off of the connecting pipeline can be adjusted through the operation of the valve component, so that the state of the energy accumulator is adjusted, and the air conditioning system can be switched among a plurality of different working modes; the energy accumulator has a non-working state, a cold storage state, a cold release state, a heat storage state and a heat release state, namely the energy accumulator can participate in the work or not; when the device participates in work, the device can store cold and release cold; not only can store heat, but also can release heat, thereby meeting the diversified demands of users to a higher degree and improving the use experience of the users.

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 limiting the invention. In the drawings:

FIG. 1 is a schematic diagram of an air conditioning system according to some embodiments of the present invention.

Fig. 2 is a schematic diagram of refrigerant flow in a normal cooling mode according to some embodiments of the air conditioning system of the present invention.

Fig. 3 is a schematic view of refrigerant flow in the complete cold storage mode according to some embodiments of the air conditioning system of the present invention.

Fig. 4 is a schematic diagram of refrigerant flow in the cooling and storage mode according to some embodiments of the air conditioning system of the present invention.

FIG. 5 is a schematic view of refrigerant flow in the sub-cooling and cooling mode according to some embodiments of the present invention.

FIG. 6 is a schematic diagram of the flow of refrigerant in the condensing and cooling mode according to some embodiments of the present invention.

FIG. 7 is a schematic diagram of refrigerant flow in a parallel cooling mode according to some embodiments of the present invention.

Fig. 8 is a schematic diagram of refrigerant flow in a conventional heating mode according to some embodiments of the air conditioning system of the present invention.

Fig. 9 is a schematic diagram illustrating the flow of the refrigerant in the full heat storage mode according to some embodiments of the air conditioning system of the present invention.

Fig. 10 is a schematic diagram illustrating the flow of the refrigerant in the heating and heat storage mode according to some embodiments of the air conditioning system of the present invention.

FIG. 11 is a schematic diagram of the flow of refrigerant in the mixed heat release mode according to some embodiments of the present invention.

Fig. 12 is a schematic diagram of refrigerant flow in an independent heat release mode according to some embodiments of the air conditioning system of the present invention.

Fig. 13 is a schematic view illustrating the flow of refrigerant in the defrosting mode according to some embodiments of the air conditioning system of the present invention.

In the figure:

1. an outdoor unit; 2. an energy storage device; 3. a liquid side main pipe; 4. a gas side main pipe;

101. a compressor; 102. an oil separator; 103. a one-way valve; 104. a four-way valve; 105. an outdoor heat exchanger; 106. a third throttling element; 107. a fourth orifice; 108. a fifth control valve; 109. a subcooler; 110. a gas-liquid separator;

201. an accumulator; 202. a first air pipe; 203. a second air pipe; 204. a first liquid pipe; 205. a second liquid pipe; 206. a first orifice member; 207. a first control valve; 208. a third control valve; 209. a second orifice member; 210. a fourth control valve; 211. a second control valve;

301. an indoor heat exchanger.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention.

As shown in fig. 1, in some embodiments of the air conditioning system provided by the present invention, the air conditioning system includes a compressor 101, an outdoor heat exchanger 105, an indoor heat exchanger 301, an accumulator 201, and a valve assembly, a first end of the accumulator 201 is respectively communicated with an exhaust port of the outdoor heat exchanger 105 and an exhaust port of the compressor 101, a second end of the accumulator 201 is respectively communicated with an intake port of the indoor heat exchanger 301 and an intake port of the compressor 101, and the valve assembly is connected to the compressor 101, the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, and the valve assembly is configured to control a flow direction of a refrigerant and/or make and break of a connecting pipeline, so as to adjust a state of the accumulator 201 and realize switching between different operation modes of the air conditioning system, where the state of the accumulator 201 includes a non-operation state, a cold storage state, a cold release state, a cold storage state, a heat release state, and a heat release state.

In the above embodiment, by operating the valve assembly, the flow direction of the refrigerant can be changed and/or the on-off of the connecting pipeline can be adjusted, so as to adjust the state of the energy accumulator and realize the switching of the air conditioning system among a plurality of different working modes; moreover, the energy accumulator 201 has a non-working state, a cold storage state, a cold release state, a heat storage state and a heat release state, that is, the energy accumulator may or may not participate in the work; when the device participates in work, the device can store cold and release cold; not only can store heat, but also can release heat, thereby meeting the diversified demands of users to a higher degree and improving the use experience of the users.

As shown in fig. 1, in some embodiments, the valve assembly includes a first control valve 207 and a first throttling member 206, and the first control valve 207 and the first throttling member 206 are connected in parallel between the first end of the accumulator 201 and the outdoor heat exchanger 105.

Two connection modes between the first ends of the outdoor heat exchanger 105 and the energy accumulator 201 can be realized by arranging the first control valve 207 and the first throttling element 206 which are connected in parallel, when the first ends of the outdoor heat exchanger 105 and the energy accumulator 201 are communicated through the first control valve 207, a refrigerant flowing out of the outdoor heat exchanger 105 can directly enter the energy accumulator 201 in an outflow state, and the refrigerant can be further supercooled in the energy accumulator 201; when the outdoor heat exchanger 105 is communicated with the first end of the energy accumulator 201 through the first throttling element 206, the refrigerant flowing out of the outdoor heat exchanger 105 can flow into the energy accumulator 201 after being throttled, so that the purpose of cold accumulation is achieved.

In some embodiments, the valve assembly includes a second control valve 211, and the second control valve 211 is disposed on a connection line between the indoor heat exchanger 301 and a first connection point on a line connecting the outdoor heat exchanger 105 with the first control valve 207 and the first throttle member 206.

By providing the second control valve 211, the connection between the indoor heat exchanger 301 and the first connection point can be made, and the first connection point is communicated with the outdoor heat exchanger 105, so that the connection between the indoor heat exchanger 301 and the outdoor heat exchanger 105 and the connection between the indoor heat exchanger 301 and the accumulator 201 can be made.

In some embodiments, the valve assembly comprises a third control valve 208, the third control valve 208 being arranged on the connection line between the first end of the accumulator 201 and the discharge of the compressor 101.

By providing the third control valve 208, the connection line between the first end of the accumulator 201 and the exhaust port of the compressor 101 can be opened and closed. When the first end of the accumulator 201 is communicated with the exhaust port of the compressor 101, the exhaust gas of the compressor 101 can directly enter the accumulator 201, so that the heat storage function of the accumulator 201 is realized.

In some embodiments, the valve assembly comprises a fourth control valve 210, the fourth control valve 210 being arranged on the connection line between the second end of the accumulator 201 and the air inlet of the compressor 101.

By providing the fourth control valve 210, the connection between the second end of the accumulator 201 and the air inlet of the compressor 101 can be switched on and off. When the second end of the accumulator 201 is communicated with the air inlet of the compressor 101, the refrigerant flowing out from the second end of the accumulator 201 can flow back to the compressor 101, and the cycle after cold accumulation or heat release is completed.

In some embodiments, the valve assembly comprises a second orifice 209, a first end of the second orifice 209 communicates with a second end of the accumulator 201, and a second end of the second orifice 209 communicates with the indoor heat exchanger 301 and the outdoor heat exchanger 105, respectively.

By providing the second throttling element 209, the connection pipeline between the second end of the accumulator 201 and the indoor heat exchanger 301 or the outdoor heat exchanger 105 can be switched on or off. When the second end of the energy accumulator 201 is communicated with the indoor heat exchanger 301, the refrigerant in the energy accumulator 201 may flow to the indoor heat exchanger 301 for heat absorption and evaporation; when the second end of the accumulator 201 is communicated with the outdoor heat exchanger 105, the refrigerant in the accumulator 201 can flow to the outdoor heat exchanger 105, thereby realizing the heat storage function.

In some embodiments, the valve assembly includes a third orifice 106, and the third orifice 106 is disposed on a connection line between the outdoor heat exchanger 105 and the indoor heat exchanger 301.

By providing the third throttling part 106, it is possible to achieve a throttling effect in the heating mode or to intercept a connection pipe between the accumulator 201 and the outdoor heat exchanger 105 in the condensation heat-release mode or the independent heat-release mode.

In some embodiments, the valve assembly comprises a four-way valve 104, the four-way valve 104 comprising a first port in communication with the discharge port of the compressor 101, a second port in communication with the outdoor heat exchanger 105, a third port in communication with the intake port of the compressor 101, and a fourth port in communication with the indoor heat exchanger 301.

By arranging the four-way valve 104, switching between connecting pipelines can be realized, and support is provided for realizing different working modes of the air conditioning system.

In some embodiments, the air conditioning system further includes a subcooler 109 disposed between the outdoor heat exchanger 105 and the indoor heat exchanger 301, and the subcooler 109 is in communication with an air intake of the compressor 101. By providing the subcooler 109, the cooling capacity of the air conditioning system can be increased.

In some embodiments, the air conditioning system further includes a fourth throttling member 107, the third throttling member 106 is disposed on a connection pipe between the outdoor heat exchanger 105 and the subcooler 109, and the fourth throttling member 107 is disposed on a connection pipe between the third throttling member 106 and a port of the subcooler 109 communicating with an air inlet of the compressor 101.

In some embodiments, the air conditioning system further includes a fifth control valve 108, the fifth control valve 108 being connected between the subcooler 109 and a second connection point, the second connection point being in communication with the third port of the four-way valve 104 and the air inlet of the compressor 101, respectively.

In some embodiments, the air conditioning system further includes a gas-liquid separator 110 in communication with the air intake of the compressor 101. Alternatively, the components communicated with the air inlet of the compressor 101 are communicated with the inlet of the gas-liquid separator 110, and then are separated by the gas-liquid separator 110 and then communicated with the air inlet of the compressor 101.

By providing the gas-liquid separator 110, the liquid entering the compressor 101 can be reduced, and the occurrence of liquid hammer can be prevented.

In some embodiments, the air conditioning system further comprises an oil separator 102 in communication with the discharge port of the compressor 101, and the discharge port of the compressor 101 is separated by the oil separator 102 before communicating with other components in communication with the discharge port of the compressor 101.

By arranging the oil separator 102, lubricating oil in the exhaust gas of the compressor 101 can be separated in time, so that the refrigerant in subsequent circulation still contains impurities such as lubricating oil and the like, and the recycling of the lubricating oil can be realized.

In some embodiments, the air conditioning system further comprises a check valve 103 in communication with the exhaust port of the compressor 101, an inlet of the check valve 103 in communication with the exhaust port of the compressor 101, and an outlet of the check valve 103 in communication with a first end of the accumulator 201 and a first port of the four-way valve 104, respectively.

By providing the check valve 103, the refrigerant can be prevented from flowing backward.

In some embodiments, the inlet of the check valve 103 communicates with the outlet of the oil separator 102.

In some embodiments, the connection between the exhaust port of the compressor 101 and the first end of the accumulator 201 is a first gas pipe 202, the connection between the second end of the accumulator 201 and the intake port of the compressor 101 is a second gas pipe 203, the first end of the accumulator 201 is connected with a first liquid pipe 204, and the second end of the accumulator 201 is connected with a second liquid pipe 205.

In some embodiments, the valve assembly comprises a first control valve 207, a second control valve 211, a third control valve 208, a fourth control valve 210, a first throttle 206, a second throttle 209, a third throttle 106, and a four-way valve 104, the first control valve 207 and the first throttle 206 are connected in parallel between a first end of the accumulator 201 and a first connection point, the first connection point is in communication with the outdoor heat exchanger 105, the second control valve 211 is disposed on a connection line between the first connection point and the indoor heat exchanger 301, the third control valve 208 is disposed on a connection line between a first end of the accumulator 201 and an exhaust port of the compressor 101, the fourth control valve 210 is disposed on a connection line between a second end of the accumulator 201 and an air inlet of the compressor 101, the first end of the second throttle 209 is in communication with a second end of the accumulator 201, the second end of the second throttle 209 is in communication with the indoor heat exchanger 301 and the outdoor heat exchanger 105, respectively, the third throttle 106 is disposed on a connection line between the outdoor heat exchanger 105 and the first connection point, the four-way valve 104 comprises a first interface, a second interface and a fourth interface, the fourth interface is in communication with the outdoor heat exchanger 101, the outdoor interface is in communication with the outdoor heat exchanger 105, the fourth interface is in communication with the outdoor heat exchanger 101, the fourth interface is in communication with the outdoor interface, and the fourth interface is in communication with the outdoor heat exchanger 101.

In some embodiments of the air conditioning system provided by the present invention, the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, and the fifth control valve 108 may be an on-off valve, a proportional valve, or the like.

In some embodiments of the air conditioning system provided by the present invention, the first throttle 206, the second throttle 209, the third throttle 106, and the fourth throttle 107 may be electronic expansion valves, etc.

The air conditioning system provided by the invention can realize at least 12 working modes such as conventional refrigeration, complete cold accumulation, refrigeration cold accumulation, supercooling cold release, condensation cold release, parallel cold release, conventional heating, complete heat accumulation, heating heat accumulation, mixed heat release, independent heat release, defrosting and the like by adjusting the state of the valve component, thereby meeting different requirements of users, simultaneously widening the application range of the air conditioning system and greatly improving the availability ratio of the air conditioning system. Moreover, the air conditioning system designed by the invention has the advantages of simple pipeline and lower cost.

Based on the air conditioning system, the invention also provides a control method of the air conditioning system, which comprises the following steps:

determining the working mode of the air conditioning system;

the actuation of the valve assembly and the state of the accumulator 201 in the air conditioning system are controlled according to a preset control strategy and based on the operating mode.

At present, in order to save power resources, time-of-use electricity price policies are adopted in many cities, for example, in the peak period of electricity utilization, the electricity price is higher, so that the awareness of saving electricity of people is improved through the improvement of cost; in the time period of the electricity consumption valley, the electricity price is lower, people are guided to use the electricity resource by staggering peaks, and the situation that great pressure is caused to a power supply system is avoided.

To this end, in some embodiments of the control method provided by the present invention, determining the operation mode of the air conditioning system comprises:

in the time period when the power supply system is at a high power price, determining that the working mode of the air conditioning system is a mode corresponding to the state that the energy accumulator 201 is in a non-working state, a cold quantity releasing state or a heat quantity releasing state;

in a period when the power supply system is at a low electricity price, the working mode of the air conditioning system is determined to be a mode corresponding to the state that the energy accumulator 201 is in a non-working state, a cold storage state or a heat storage state.

The working mode of the air conditioning system is determined according to the electricity price of the power supply system, cold or heat can be stored in the energy accumulator 201 in a low electricity price period, and the air conditioning system is set to be in a mode corresponding to the energy accumulator 201 in a non-working state, a cold release state or a heat release state in a high electricity price period, so that the purpose of refrigeration or heating is mainly or auxiliarily realized by utilizing the heat or cold stored in advance by the energy accumulator 201, the working frequency of the compressor 101 is reduced, the power consumption of the air conditioning system in a high electricity price period is reduced, and the economic pressure of a user is reduced; the method is also favorable for realizing peak shifting power utilization and reducing the power supply pressure of a power supply system.

In some embodiments, the air conditioning system may determine the operation mode of the air conditioning system according to the current demand of the user, or may automatically determine the operation mode of the air conditioning system according to a pre-stored charging standard of the power supply system.

detecting whether energy is stored in the energy accumulator 201;

In some embodiments, the determining the operation mode of the air conditioning system according to the detection result includes:

when detecting that there is no energy in the energy accumulator 201, determining that the operating mode of the air conditioning system is a mode corresponding to the energy accumulator 201 being in a non-operating state, a heat storage state or a cold storage state.

When detecting that energy is stored in the energy accumulator 201, it may be determined according to the requirement that the operating mode of the air conditioning system is a mode corresponding to the energy accumulator 201 being in a non-operating state, a heat storage state, a cold storage state, a heat release state, or a cold release state.

When the energy in the accumulator 201 is used, the energy remaining amount in the accumulator 201 is detected in real time, and when it is detected that the energy remaining amount is close to zero, the use of the energy in the accumulator 201 is stopped.

determining the working mode of the air conditioning system;

the actions of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttle 206, the second throttle 209, the third throttle 106, and the four-way valve 104, and the states of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201 in the air conditioning system are controlled according to a preset control strategy and based on the operation mode.

In some embodiments, controlling the actions of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttle 206, the second throttle 209, the third throttle 106, and the four-way valve 104 and the states of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201 in the air conditioning system according to a preset control strategy and based on the operation mode includes:

when the working mode is the conventional refrigeration mode, the four-way valve 104 is controlled to be powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the second control valve 211 to be opened, and closing the first control valve 207, the third control valve 208 and the fourth control valve 210; and

the first throttling element 206 and the second throttling element 209 are controlled to be in a closed state, and the third throttling element 106 is controlled to be in an open state, and the opening size is adjustable;

wherein the indoor heat exchanger 301 functions as an evaporator, the outdoor heat exchanger 105 functions as a condenser, and the accumulator 201 is turned off.

when the working mode is the complete cold accumulation mode, the four-way valve 104 is controlled to be powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the fourth control valve 210 to open, and closing the first control valve 207, the third control valve 208 and the second control valve 211; and

the first throttling element 206 and the third throttling element 106 are controlled to be in an opening state, the opening size is adjustable, and the second throttling element 209 is controlled to be in a closing state;

wherein the indoor heat exchanger 301 is turned off, the outdoor heat exchanger 105 functions as a condenser, and the accumulator 201 functions as an evaporator.

when the working mode is a refrigeration and cold accumulation mode, the four-way valve 104 is controlled to be powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

the fourth control valve 210 and the second control valve 211 are controlled to be opened, and the first control valve 207 and the third control valve 208 are controlled to be closed; and

among them, the indoor heat exchanger 301 serves as an evaporator, the outdoor heat exchanger 105 serves as a condenser, and the accumulator 201 serves as an evaporator.

In some embodiments, controlling the actions of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttle 206, the second throttle 209, the third throttle 106, and the four-way valve 104, and the states of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201 in the air conditioning system according to a preset control strategy and based on the operation mode includes:

when the working mode is the supercooling cold release mode, controlling the four-way valve 104 to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the first control valve 207 to be opened, and the third control valve 208, the fourth control valve 210 and the second control valve 211 to be closed; and

the first throttling element 206 is controlled to be in a closed state, the second throttling element 209 and the third throttling element 106 are controlled to be in an open state, and the opening size is adjustable;

among them, the indoor heat exchanger 301 serves as an evaporator, the outdoor heat exchanger 105 serves as a condenser, and the accumulator 201 serves as a subcooler.

when the working mode is a condensing and cooling mode, the four-way valve 104 is controlled to be powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

the third control valve 208 is controlled to be opened, and the first control valve 207, the fourth control valve 210 and the second control valve 211 are closed; and

the first throttling element 206 and the third throttling element 106 are controlled to be in a closed state, the second throttling element 209 is controlled to be in an open state, and the opening size is adjustable;

wherein the indoor heat exchanger 301 functions as an evaporator, the outdoor heat exchanger 105 is turned off, and the accumulator 201 functions as a condenser.

when the working mode is the parallel cold release mode, the four-way valve 104 is controlled to be powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

the third control valve 208 and the second control valve 211 are controlled to be opened, and the first control valve 207 and the fourth control valve 210 are controlled to be closed; and

the first throttling element 206 is controlled to be in a closed state, the second throttling element 209 and the third throttling element 106 are both in an open state, and the opening size is adjustable;

among them, the indoor heat exchanger 301 serves as an evaporator, and the outdoor heat exchanger 105 and the accumulator 201 each serve as a condenser.

when the working mode is the conventional heating mode, the four-way valve 104 is controlled to be powered on, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

the second control valve 211 is controlled to be opened, and the first control valve 207, the third control valve 208 and the fourth control valve 210 are controlled to be closed; and

the first throttling element 206 and the second throttling element 209 are controlled to be in a closed state, the third throttling element 106 is in an open state, and the opening size is adjustable;

wherein the indoor heat exchanger 301 functions as a condenser, the outdoor heat exchanger 105 functions as an evaporator, and the accumulator 201 is turned off.

when the working mode is the complete heat storage mode, the four-way valve 104 is controlled to be powered on, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

wherein the indoor heat exchanger 301 is turned off, the outdoor heat exchanger 105 functions as an evaporator, and the accumulator 201 functions as a condenser.

when the working mode is a heating and heat storage mode, the four-way valve 104 is controlled to be powered on, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

among them, the indoor heat exchanger 301 serves as a condenser, the outdoor heat exchanger 105 serves as an evaporator, and the accumulator 201 serves as a condenser.

when the working mode is a mixed heat release mode, the four-way valve 104 is controlled to be powered on, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

among them, the indoor heat exchanger 301 serves as a condenser, the outdoor heat exchanger 105 serves as an evaporator, and the accumulator 201 serves as an evaporator.

when the working mode is the independent heat release mode, the four-way valve 104 is controlled to be powered on, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

the first throttling element 206 is controlled to be in an opening state, the opening size is adjustable, and the second throttling element 209 and the third throttling element 106 are both in a closing state;

wherein the indoor heat exchanger 301 functions as a condenser, the outdoor heat exchanger 105 is turned off, and the accumulator 201 functions as an evaporator.

when the working mode is a defrosting mode, the four-way valve 104 is controlled to be powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

the fourth control valve 210 is controlled to be opened, and the first control valve 207, the third control valve 208 and the second control valve 211 are all closed; and

The present invention also provides a control device of an air conditioning system, including:

a memory configured to store instructions;

The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the instructions are executed by a processor to implement the control method.

The operation of the air conditioning system according to the present invention will be described with reference to fig. 1 to 12:

as shown in fig. 1, the air conditioning system includes an outdoor unit 1, an energy storage device 2, and an indoor unit.

An oil separator 102, a check valve 103, and a four-way valve 104 are connected in this order to the outlet of the compressor 101 of the outdoor unit 1. The four-way valve 104 can be communicated with an outdoor heat exchanger 105, the outdoor heat exchanger 105 is communicated with a third throttling element 106, one path of the third throttling element 106 is connected to the energy storage device 2 through a cooler 109, the other path of the third throttling element 106 is communicated with a gas-liquid separator 110 through a fourth throttling element 107, a subcooler 109 and a fifth control valve 108, and the outlet of the gas-liquid separator 110 is communicated with the gas inlet of the compressor 101.

The first end of the accumulator 201 in the energy storage device 2 is connected with the exhaust pipeline of the compressor 101 through a first gas pipe 202 and is connected with the liquid side header pipe 3 through a first liquid pipe 204; a second end of the accumulator 201 is connected to the inlet pipe of the gas-liquid separator 110 via a second gas pipe 203, and is connected to the liquid-side header pipe 3 via a second liquid pipe 205. In order to realize the switching of the functions, a third control valve 208 is arranged on the first gas pipe 202 of the accumulator 201, and a first throttling element 206 and a first control valve 207 are arranged on the first liquid pipe 204 and are in parallel connection; a fourth control valve 210 is disposed on the second air pipe 203, and a second orifice 209 is disposed on the second liquid pipe 205. The liquid side manifold 3 is provided with a second control valve 211 between a connection to the first liquid pipe 204 and a connection to the second liquid pipe 205. The liquid side header pipe 3 and the air side header pipe 4 are connected to both sides of the indoor heat exchanger 301 of the indoor unit, respectively.

The embodiment provides a multifunctional energy storage air conditioning system which can provide energy storage and energy release services aiming at various different power load transfer scenes.

The energy accumulator 201 is filled with energy storage materials, such as organic phase change materials such as ice water and paraffin, and inorganic phase change materials such as mirabilite. The energy accumulator 201 is provided with a refrigerant pipeline, and the refrigerant flows in the pipeline and fully exchanges heat with the energy storage material, so that the cold and heat can be stored and released.

Through the switching of the valve components, various functions such as conventional refrigeration, complete cold accumulation, refrigeration cold accumulation, supercooling cold release, condensation cold release, conventional heating, complete heat accumulation, heating and heat accumulation, mixed heat release, independent heat release, defrosting and the like can be realized.

Referring to table 1, there is shown a table of the states of the various components in the valve assembly and the state of the heat exchanger for each operating mode.

TABLE 1 corresponding table of working mode and valve state

As shown in fig. 2, in the normal cooling mode:

when the four-way valve 104 is powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface; the second control valve 211 is opened, and the first control valve 207, the third control valve 208, and the fourth control valve 210 are all closed; the first throttling element 206 and the second throttling element 209 are both in a closed state, and the third throttling element 106 is in an open state and has an adjustable opening size; wherein the indoor heat exchanger 301 functions as an evaporator, the outdoor heat exchanger 105 functions as a condenser, and the accumulator 201 is turned off.

The refrigerant discharged from the compressor 101 passes through the outdoor heat exchanger 105, enters the indoor unit through the liquid-side header pipe 3, evaporates in the indoor unit, and returns to the suction side of the compressor 101 through the gas-side header pipe 4 and the gas-liquid separator 110. The accumulator 201 is not used at this time, and only the normal refrigeration cycle function is realized.

As shown in fig. 3, in the full cold storage mode:

the four-way valve 104 is powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface; the fourth control valve 210 is opened, and the first control valve 207, the third control valve 208, and the second control valve 211 are all closed; the first and

third throttling elements

206, 106 are in an open state and have adjustable openings, and the second throttling element 209 is in a closed state; wherein the indoor heat exchanger 301 is turned off, the outdoor heat exchanger 105 serves as a condenser, and the accumulator 201 serves as an evaporator.

The refrigerant discharged from the compressor 101 flows through the outdoor heat exchanger 105, enters the accumulator 201 through the liquid side header pipe 3 and the first throttle 206, evaporates, and returns to the suction side of the compressor 101 through the second gas pipe 203 and the gas-liquid separator 110. The refrigerant is evaporated in the accumulator 201 without flowing through the indoor unit, and the cooling energy is stored in the accumulator 201.

As shown in fig. 4, in the cooling cold storage mode:

when the four-way valve 104 is powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface; the fourth control valve 210 and the second control valve 211 are opened, and the first control valve 207 and the third control valve 208 are closed; the first and

third throttling elements

206, 106 are in an open state and have adjustable openings, and the second throttling element 209 is in a closed state; among them, the indoor heat exchanger 301 serves as an evaporator, the outdoor heat exchanger 105 serves as a condenser, and the accumulator 201 serves as an evaporator.

The refrigerant discharged from the compressor 101 passes through the outdoor heat exchanger 105 and is divided into two paths by the liquid side header pipe 3, one path enters the accumulator 201 through the first throttle member 206, flows into the second air pipe 203 after being evaporated, the other path enters the indoor heat exchanger for evaporation, and the two paths are converged at the inlet of the gas-liquid separator 110 and return to the suction side of the compressor 101. At this time, the energy accumulator 201 and the indoor heat exchanger simultaneously serve as evaporators, the energy accumulator 201 stores cold, and the indoor heat exchanger provides cold for the indoor.

As shown in fig. 5, in the supercooling cold release mode:

when the four-way valve 104 is powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface; the first control valve 207 is opened, the third control valve 208, the fourth control valve 210, and the second control valve 211 are closed; the first throttling element 206 is in a closed state, the second throttling element 209 and the third throttling element 106 are in an open state, and the opening size is adjustable; among them, the indoor heat exchanger 301 serves as an evaporator, the outdoor heat exchanger 105 serves as a condenser, and the accumulator 201 serves as a subcooler.

The refrigerant discharged from the compressor 101 flows through the outdoor heat exchanger 105, enters the accumulator 201 through the liquid-side header pipe 3 and the first control valve 207, is supercooled, then enters the liquid-side header pipe 3 through the second liquid pipe 205 and the second throttle 209, is evaporated in the indoor heat exchanger, and then returns to the suction side of the compressor 101 through the gas-side header pipe 4 and the gas-liquid separator 110. At this time, the accumulator 201 serves as a subcooler, and releases cold energy to the refrigerant condensed in the outdoor heat exchanger 105, so that the subcooled refrigerant is further increased and flows into the indoor unit for evaporation, and the refrigerating capacity of the refrigerant is improved.

As shown in fig. 6, in the condensing and cooling mode:

when the four-way valve 104 is powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface; the third control valve 208 is opened, and the first control valve 207, the fourth control valve 210, and the second control valve 211 are closed; the first throttling element 206 and the third throttling element 106 are in a closed state, the second throttling element 209 is in an open state, and the opening size is adjustable; wherein the indoor heat exchanger 301 functions as an evaporator, the outdoor heat exchanger 105 is turned off, and the accumulator 201 functions as a condenser.

The refrigerant discharged from the compressor 101 flows into the accumulator 201 through the first gas pipe 202 and the third control valve 208, is condensed, then flows into the liquid side header pipe 3 through the second liquid pipe 205 and the second orifice 209, is evaporated in the indoor heat exchanger, and then returns to the suction side of the compressor 101 through the gas side header pipe 4 and the gas-liquid separator 110. Instead of using the outdoor heat exchanger 105, the accumulator 201 is used as a condenser to provide cooling energy to the refrigeration cycle. Because the temperature of the cold storage material in the energy accumulator 201 is far lower than the outdoor ambient temperature, the refrigeration cycle can be operated under the condition of low pressure ratio, and the load of the compressor 101 is greatly reduced.

As shown in fig. 7, in the parallel cooling mode:

when the four-way valve 104 is powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface; the third control valve 208 and the second control valve 211 are opened, and the first throttle 206, the first control valve 207, and the fourth control valve 210 are closed; the second throttling element 209 and the third throttling element 106 are both in an opening state, and the opening size is adjustable; among them, the indoor heat exchanger 301 serves as an evaporator, and the outdoor heat exchanger 105 and the accumulator 201 each serve as a condenser.

The refrigerant discharged from the compressor 101 is divided into two paths, and the first path flows into the accumulator 201 through the first gas pipe 202 and the third control valve 208, is condensed, and then enters the liquid side header pipe 3 through the second liquid pipe 205 and the second throttling element 209; the other path is condensed by the outdoor heat exchanger 105, passes through the liquid side header pipe 3 and the second control valve 211, then is merged with the first path, enters the indoor heat exchanger 301 for evaporation, passes through the gas side header pipe 4 and the gas-liquid separator 110, and returns to the suction side of the compressor 101. At this time, the accumulator 201 and the outdoor heat exchanger 105 are used together for condensation. Because the energy accumulator 201 and the outdoor heat exchanger 105 are used as condensing equipment at the same time, larger condensing capacity can be provided, and the requirement of high-load operation of the unit is met.

As shown in fig. 8, in the normal heating mode:

the four-way valve 104 is electrified, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface; the second control valve 211 is opened, the first control valve 207, the third control valve 208, and the fourth control valve 210 are closed; the first throttling element 206 and the second throttling element 209 are in a closed state, the third throttling element 106 is in an open state, and the opening size is adjustable; wherein the indoor heat exchanger 301 functions as a condenser, the outdoor heat exchanger 105 functions as an evaporator, and the accumulator 201 is turned off.

The refrigerant discharged from the compressor 101 flows into the indoor heat exchanger through the gas-side header pipe 4 to be condensed, flows into the outdoor heat exchanger 105 through the liquid-side header pipe 3 to be evaporated, and returns to the suction side of the compressor 101 through the gas-liquid separator 110. At this point, no accumulator is used, only the conventional heating cycle is used.

As shown in fig. 9, in the full heat storage mode:

the four-way valve 104 is electrified, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface; the third control valve 208 and the second control valve 211 are opened, and the first control valve 207 and the fourth control valve 210 are closed; the first throttling element 206 is in a closed state, the second throttling element 209 and the third throttling element 106 are in an open state, and the opening size is adjustable; wherein the indoor heat exchanger 301 is turned off, the outdoor heat exchanger 105 serves as an evaporator, and the accumulator 201 serves as a condenser.

The refrigerant discharged from the compressor flows into the accumulator 201 through the first gas pipe 202 and the third control valve 208, is condensed, then flows into the liquid-side header pipe 3 through the second liquid pipe 205 and the second orifice 209, flows into the outdoor heat exchanger 105 through the second control valve 211, is evaporated in the outdoor heat exchanger 105, and then returns to the suction side of the compressor 101 through the four-way valve 104, the gas-side header pipe 4, and the gas-liquid separator 110. At this time, the refrigerant is condensed in the accumulator 201, and heat is stored in the accumulator 201 and evaporated in the outdoor heat exchanger 105.

As shown in fig. 10, in the heat storage and heating mode:

the four-way valve 104 is electrified, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface; the third control valve 208 and the second control valve 211 are opened, and the first control valve 207 and the fourth control valve 210 are closed; the first throttling element 206 is in a closed state, the second throttling element 209 and the third throttling element 106 are in an open state, and the opening size is adjustable; among them, the indoor heat exchanger 301 serves as a condenser, the outdoor heat exchanger 105 serves as an evaporator, and the accumulator 201 serves as a condenser.

The refrigerant discharged from the compressor is divided into two paths, wherein one path of refrigerant flows into the energy accumulator 201 through the first gas pipe 202 and the third control valve 208 to be condensed and then enters the liquid side header pipe 3 through the second liquid pipe 205 and the second throttling element 209, the other path of refrigerant enters the indoor heat exchanger through the four-way valve 104, and after being condensed and then enters the liquid side header pipe 3 to be merged with the first path of refrigerant, the condensed refrigerant flows into the outdoor heat exchanger 105 through the second control valve 211 to be evaporated, and then the condensed refrigerant returns to the suction side of the compressor 101 through the four-way valve 104, the gas side header pipe 4 and the gas-liquid separator 110. At this time, the accumulator 201 and the indoor heat exchanger simultaneously function as a condenser, heat is generated while storing heat, and the outdoor heat exchanger 105 functions as an evaporator.

As shown in fig. 11, in the mixed heat release mode:

the four-way valve 104 is electrified, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface; the fourth control valve 210 and the second control valve 211 are opened, and the first control valve 207 and the third control valve 208 are closed; the first throttling element 206 and the third throttling element 106 are both in an open state, the opening size is adjustable, and the second throttling element 209 is in a closed state; among them, the indoor heat exchanger 301 serves as a condenser, the outdoor heat exchanger 105 serves as an evaporator, and the accumulator 201 serves as an evaporator.

The refrigerant discharged from the compressor 101 flows into the indoor heat exchanger 301 through the gas-side header pipe 4 to be condensed, and then is divided after passing through the second control valve 211, one path of the refrigerant enters the energy accumulator 201 through the first liquid pipe 204 and the first throttle 206 to be evaporated, and then flows into the second gas pipe 203 and the fourth control valve 210, the other path of the refrigerant flows into the outdoor heat exchanger 105 through the liquid-side header pipe 3 to be evaporated, and the two paths of the refrigerant are converged at the inlet section of the gas-liquid separator 110 and return to the suction side of the compressor 101. At this time, the accumulator 201 takes a part of the evaporation load, and increases the suction pressure.

As shown in fig. 12, in the independent heat release mode:

the four-way valve 104 is electrified, the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface; the fourth control valve 210 and the second control valve 211 are opened, and the first control valve 207 and the third control valve 208 are closed; the first throttling element 206 is in an open state and the opening size is adjustable, and the second throttling element 209 and the third throttling element 106 are both in a closed state; wherein the indoor heat exchanger 301 functions as a condenser, the outdoor heat exchanger 105 is turned off, and the accumulator 201 functions as an evaporator.

The refrigerant discharged from the compressor 101 flows into the indoor heat exchanger through the gas-side header 4 to be condensed, passes through the second control valve 211, then enters the accumulator 201 through the first liquid pipe 204 and the first throttling element 206 to be evaporated, then flows into the gas-liquid separator 110 through the second gas pipe 203, and returns to the suction side of the compressor 101. The accumulator 201 now bears the entire evaporation load

As shown in fig. 13, in the defrosting mode:

when the four-way valve 104 is powered off, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface; the fourth control valve 210 is opened, and the first control valve 207, the third control valve 208, and the second control valve 211 are all closed; the first and

third throttling elements

206, 106 are in an open state and have adjustable openings, and the second throttling element 209 is in a closed state; wherein the indoor heat exchanger 301 is turned off, the outdoor heat exchanger 105 functions as a condenser, and the accumulator 201 functions as an evaporator.

The refrigerant discharged from the compressor 101 flows through the outdoor heat exchanger 105, is condensed, enters the accumulator 201 through the liquid side header pipe 3 and the first throttling element 206, is evaporated, and then returns to the suction side of the compressor 101 through the fourth control valve 210, the second gas pipe 203 and the gas-liquid separator 110. The refrigerant evaporates in the accumulator 201 without flowing through the indoor unit, and the stored heat is used to defrost the outdoor heat exchanger 105.

When the electricity price is low, the energy storage equipment 2 is used for storing energy; when the electricity price is in a peak, the energy storage equipment 2 is used for cooling or heating, so that energy can be provided for the system, the running frequency of the compressor is reduced, the power consumption is reduced, the running cost is reduced, the peak clipping and valley filling of the electric power are realized, and the running cost of the air conditioner is reduced.

When defrosting is performed by the energy storage device 2, the evaporation load of the system can be borne, and compared with a reverse cycle defrosting scheme adopted by a non-energy-storage air conditioner, heat does not need to be absorbed from the indoor space, so that the indoor comfort is kept. On the whole, the multifunctional energy storage air conditioning system can effectively achieve the purpose of reducing the operation cost aiming at various application scenes.

The user can generally determine from the real-time electricity rates and power consumption: when the electricity price is at the peak value or the refrigeration requirement of the air conditioner is large, the low energy consumption requirement and the ultra-low energy consumption requirement can be set according to the actual situation.

When the air conditioning system only has refrigeration requirements, the pipeline is switched to a 'conventional refrigeration' mode, and the energy accumulator 201 is not used; when detecting that the system only has a cold accumulation requirement, switching to a 'complete cold accumulation' mode without using an indoor unit; when the system is detected to have cold accumulation requirements and refrigeration requirements at the same time, the system is switched to a refrigeration and cold accumulation simultaneous mode, and the flow of the refrigerant distributed to the energy accumulator 201 is adjusted through the opening degree of the first throttling element 206; when the system has the refrigeration requirements of low energy consumption and high condensation capacity and the cold quantity is stored in the energy accumulator 201, the system is switched to a parallel cold release mode, and in the mode, the energy accumulator and the outdoor heat exchanger are used as condensers at the same time, so that the purposes of reducing the energy consumption and increasing the condensation capacity can be achieved; when the system has refrigeration requirements of low energy consumption and low condensation capacity and cold energy is stored in the energy accumulator 201, the system is switched to a 'supercooling cold releasing' mode, and in the mode, the stored cold energy is utilized to supercool a refrigerant, so that extra cold energy is provided, and the aim of reducing the energy consumption can be fulfilled; when the system has the requirement of ultra-low energy consumption for releasing cold and refrigeration and cold energy is stored in the energy accumulator 201, the system is switched to a 'condensation and cold release' mode, the energy accumulator 201 is used as a condenser, and an indoor unit is used as an evaporator to realize refrigeration circulation.

When the air conditioning system only has heating requirements, switching the pipeline to a 'conventional heating' mode; when the system only needs heat storage, the system is switched to a complete heat storage mode; when the system has the requirement of heating and heat storage, switching to a heating and heat storage mode; when the system has a low-energy-consumption heat release and heating requirement and heat is stored in the energy accumulator 201, the system is switched to a 'mixed heat release' mode, and at the moment, the energy accumulator 201 and the outdoor heat exchanger 105 are simultaneously used as evaporators, so that the suction pressure of the compressor 101 is improved, the discharge capacity of the compressor 101 and the refrigerating capacity of the system are improved, the running frequency of the compressor 101 is reduced, and the purpose of reducing energy consumption is realized; when the system has the requirement of heat release and heating with ultralow energy consumption and heat is stored in the energy accumulator 201, the mode is switched to the independent heat release mode, and at the moment, the energy accumulator 201 is used as an independent heat source and has higher heat exchange temperature, so that the heating capacity of the refrigerant can be greatly improved, and the energy consumption of the system is reduced; when the system is detected to have a defrosting requirement and heat is stored in the energy accumulator 201, the four-way valve is reversed and switched to a defrosting mode, and the heat stored in the energy accumulator 201 is released to provide heat for defrosting of the outdoor heat exchanger 105.

In the cooling mode, when there is a demand for a large reduction in power consumption in a short time, a condensing and cooling function may be used, that is, an accumulator alone may be used as a condenser to perform a cooling cycle without using an outdoor heat exchanger as the condenser. Because the temperature of the energy storage material in the energy accumulator after storing the cold energy is lower and is far lower than the outdoor ambient temperature, the compressor does not need to provide overhigh pressure, the system can operate under the condition of low compression ratio, and the energy consumption of the system is greatly reduced. Meanwhile, the heat conduction between the low-temperature energy storage material and the refrigerant is utilized to replace the air cooling heat exchange of the outdoor heat exchanger, so that the heat exchange efficiency is improved. Under the heating mode, the energy accumulator can be independently used as an evaporator to form a refrigeration cycle with the indoor heat exchanger, so that the energy consumption is reduced, and the efficiency is improved.

Finally, it should be noted that: the above examples are only intended 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, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made without departing from the principles of the invention, and these modifications and equivalents are intended to be included within the scope of the claims.

Claims

1. An air conditioning system, comprising:

a compressor (101);

an outdoor heat exchanger (105);

an indoor heat exchanger (301);

an accumulator (201), wherein a first end of the accumulator (201) is communicated with the air outlet of the outdoor heat exchanger (105) and the air outlet of the compressor (101), and a second end of the accumulator (201) is communicated with the air inlet of the indoor heat exchanger (301) and the air inlet of the compressor (101); and

the valve assembly is connected with the compressor (101), the outdoor heat exchanger (105), the indoor heat exchanger (301) and the energy accumulator (201), the valve assembly is configured to control the flowing direction of a refrigerant and/or the on-off of a connecting pipeline so as to adjust the state of the energy accumulator (201) and realize the switching of the air conditioning system among different working modes, and the state of the energy accumulator (201) comprises a non-working state, a cold storage state, a cold release state, a heat storage state and a heat release state.

2. Air conditioning system according to claim 1, wherein the valve assembly comprises a first control valve (207) and a first throttle (206), the first control valve (207) and the first throttle (206) being connected in parallel between the first end of the accumulator (201) and the outdoor heat exchanger (105).

3. Air conditioning system according to claim 2, wherein the valve assembly comprises a second control valve (211), the second control valve (211) being arranged on a connection line between the indoor heat exchanger (301) and a first connection point, which is located on a line where the outdoor heat exchanger (105) is connected to the first control valve (207) and the first throttle (206).

4. Air conditioning system according to claim 1, wherein the valve assembly comprises a third control valve (208), the third control valve (208) being arranged on a connection line between the first end of the accumulator (201) and the discharge of the compressor (101).

5. Air conditioning system according to claim 1, wherein the valve assembly comprises a fourth control valve (210), the fourth control valve (210) being arranged on a connection line between the second end of the accumulator (201) and the inlet of the compressor (101).

6. Air conditioning system according to claim 1, wherein the valve assembly comprises a second throttle member (209), the first end of the second throttle member (209) communicating with the second end of the accumulator (201), the second end of the second throttle member (209) communicating with the indoor heat exchanger (301) and the outdoor heat exchanger (105), respectively.

7. Air conditioning system according to claim 1, wherein the valve assembly comprises a third throttle member (106), the third throttle member (106) being arranged on the connection line between the outdoor heat exchanger (105) and the indoor heat exchanger (301).

8. The air conditioning system of claim 1, wherein the valve assembly comprises a four-way valve (104), the four-way valve (104) comprising a first port in communication with a discharge port of the compressor (101), a second port in communication with the outdoor heat exchanger (105), a third port in communication with an intake port of the compressor (101), and a fourth port in communication with the indoor heat exchanger (301).

9. The air conditioning system according to any one of claims 1 to 8, further comprising a subcooler (109) disposed between the outdoor heat exchanger (105) and the indoor heat exchanger (301), and the subcooler (109) communicates with an air intake of the compressor (101).

10. Air conditioning system according to claim 1, wherein the valve assembly comprises a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106) and a four-way valve (104), the first control valve (207) and the first throttle (206) being connected in parallel between a first end of the accumulator (201) and a first connection point communicating with the outdoor heat exchanger (105), the second control valve (211) being arranged on a connection line between the first connection point and the indoor heat exchanger (301), the third control valve (208) being arranged on a connection line between the first end of the accumulator (201) and an exhaust port of the compressor (101), the fourth control valve (210) being arranged on a connection line between a second end of the accumulator (201) and an intake port of the compressor (101), the second throttle (209) being arranged on a connection line between the second end of the accumulator (201) and the intake port of the compressor (101), the second throttle (209) being arranged on a connection line between the first end of the accumulator (201) and the second connection point of the outdoor heat exchanger (105), the third control valve (106) being arranged on a connection line between the second connection point and the outdoor heat exchanger (105) and the connection point of the outdoor heat exchanger (301), the four-way valve (104) comprises a first interface, a second interface, a third interface and a fourth interface, the first interface is communicated with an exhaust port of the compressor (101), the second interface is communicated with the outdoor heat exchanger (105), the third interface is communicated with an air inlet of the compressor (101), and the fourth interface is communicated with the indoor heat exchanger (301).

11. A control method based on the air conditioning system according to any one of claims 1 to 10, characterized by comprising:

determining an operating mode of the air conditioning system;

and controlling the action of a valve assembly in the air conditioning system and the state of an accumulator (201) according to a preset control strategy and based on the working mode.

12. The control method of claim 11, wherein determining the operating mode of the air conditioning system comprises:

in a time period when the power supply system has high electricity price, determining that the working mode of the air conditioning system is a mode corresponding to the state that the energy accumulator (201) is in a non-working state, a cold quantity releasing state or a heat quantity releasing state;

and in the period when the power supply system is at a low electricity price, determining that the working mode of the air conditioning system is a mode corresponding to the state that the energy accumulator (201) is in a non-working state, a cold storage state or a heat storage state.

13. The control method of claim 11, wherein determining the operating mode of the air conditioning system comprises:

detecting whether energy is stored in the energy accumulator (201);

14. A control method based on the air conditioning system according to claim 10, characterized by comprising:

determining an operating mode of the air conditioning system;

and controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttling element (206), a second throttling element (209), a third throttling element (106) and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201) according to a preset control strategy and based on the working mode.

15. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106) and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201) according to a preset control strategy and based on the operation mode comprises:

when the working mode is a conventional refrigeration mode, controlling the four-way valve (104) to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the second control valve (211) to open, the first control valve (207), the third control valve (208) and the fourth control valve (210) to close; and

the first throttling element (206) and the second throttling element (209) are controlled to be in a closed state, and the third throttling element (106) is in an open state and has an adjustable opening size;

wherein the indoor heat exchanger (301) functions as an evaporator, the outdoor heat exchanger (105) functions as a condenser, and the accumulator (201) is closed.

16. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106) and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201) according to a preset control strategy and based on the operation mode comprises:

when the working mode is a complete cold accumulation mode, controlling the four-way valve (104) to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the fourth control valve (210) to open, the first control valve (207), the third control valve (208) and the second control valve (211) all being closed; and

controlling the first throttling element (206) and the third throttling element (106) to be in an opening state and the opening size to be adjustable, and controlling the second throttling element (209) to be in a closing state;

wherein the indoor heat exchanger (301) is closed, the outdoor heat exchanger (105) functions as a condenser, and the accumulator (201) functions as an evaporator.

17. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106), and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201) according to a preset control strategy and based on the operation mode includes:

when the working mode is a refrigeration and cold accumulation mode, controlling the power failure of the four-way valve (104), wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the fourth control valve (210) and the second control valve (211) to open, and the first control valve (207) and the third control valve (208) to close; and

wherein the indoor heat exchanger (301) functions as an evaporator, the outdoor heat exchanger (105) functions as a condenser, and the accumulator (201) functions as an evaporator.

18. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106), and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201) according to a preset control strategy and based on the operation mode includes:

when the working mode is a supercooling cold release mode, controlling the four-way valve (104) to be powered down, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the first control valve (207) to open, the third control valve (208), the fourth control valve (210), and the second control valve (211) to close; and

controlling the first throttling element (206) to be in a closed state, and controlling the second throttling element (209) and the third throttling element (106) to be in an open state and to be adjustable in opening size;

wherein the indoor heat exchanger (301) functions as an evaporator, the outdoor heat exchanger (105) functions as a condenser, and the accumulator (201) functions as a subcooler.

19. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106) and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201) according to a preset control strategy and based on the operation mode comprises:

when the working mode is a condensing and cooling mode, controlling the four-way valve (104) to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the third control valve (208) to open, and the first control valve (207), the fourth control valve (210), and the second control valve (211) to close; and

controlling the first throttling element (206) and the third throttling element (106) to be in a closed state, and controlling the second throttling element (209) to be in an open state and to be adjustable in opening size;

wherein the indoor heat exchanger (301) functions as an evaporator, the outdoor heat exchanger (105) is closed, and the accumulator (201) functions as a condenser.

20. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106), and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201) according to a preset control strategy and based on the operation mode includes:

when the working mode is a parallel cold release mode, controlling the four-way valve (104) to be powered down, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

controlling the third control valve (208) and the second control valve (211) to open, and the first control valve (207) and the fourth control valve (210) to close; and

wherein the indoor heat exchanger (301) functions as an evaporator and the outdoor heat exchanger (105) and the accumulator (201) both function as a condenser.

21. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106) and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201) according to a preset control strategy and based on the operation mode comprises:

when the working mode is a conventional heating mode, controlling the four-way valve (104) to be electrified, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

controlling the first throttling element (206) and the second throttling element (209) to be in a closed state, and controlling the third throttling element (106) to be in an open state and to be adjustable in opening size;

wherein the indoor heat exchanger (301) functions as a condenser, the outdoor heat exchanger (105) functions as an evaporator, and the accumulator (201) is closed.

22. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106), and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201) according to a preset control strategy and based on the operation mode includes:

when the working mode is a complete heat storage mode, controlling the four-way valve (104) to be electrified, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

controlling the first throttling element (206) to be in a closed state, and controlling the second throttling element (209) and the third throttling element (106) to be in an open state and the opening size to be adjustable;

wherein the indoor heat exchanger (301) is closed, the outdoor heat exchanger (105) functions as an evaporator, and the accumulator (201) functions as a condenser.

23. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106) and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201) according to a preset control strategy and based on the operation mode comprises:

when the working mode is a heating and heat storage mode, controlling the four-way valve (104) to be powered on, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

controlling a third control valve (208) and the second control valve (211) to open, and the first control valve (207) and the fourth control valve (210) to close; and

wherein the indoor heat exchanger (301) functions as a condenser, the outdoor heat exchanger (105) functions as an evaporator, and the accumulator (201) functions as a condenser.

24. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106), and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201) according to a preset control strategy and based on the operation mode includes:

when the working mode is a mixed heat release mode, controlling the four-way valve (104) to be powered on, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

controlling the first throttling element (206) and the third throttling element (106) to be in an opening state, the opening size of the first throttling element is adjustable, and the second throttling element (209) is in a closing state;

wherein the indoor heat exchanger (301) functions as a condenser, the outdoor heat exchanger (105) functions as an evaporator, and the accumulator (201) functions as an evaporator.

25. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106) and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201) according to a preset control strategy and based on the operation mode comprises:

when the working mode is an independent heat release mode, controlling the four-way valve (104) to be electrified, wherein the first interface is communicated with the fourth interface, and the second interface is communicated with the third interface;

the first throttling element (206) is controlled to be in an opening state, the opening size is adjustable, and the second throttling element (209) and the third throttling element (106) are both in a closing state;

wherein the indoor heat exchanger (301) functions as a condenser, the outdoor heat exchanger (105) is closed, and the accumulator (201) functions as an evaporator.

26. The control method according to claim 14, wherein controlling the actions of a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttle (206), a second throttle (209), a third throttle (106) and a four-way valve (104) in the air conditioning system and the states of the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201) according to a preset control strategy and based on the operation mode comprises:

when the working mode is a defrosting mode, controlling the four-way valve (104) to be powered off, wherein the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface;

27. A control device of an air conditioning system, comprising:

a memory configured to store instructions;

a processor coupled to the memory, the processor configured to perform implementing the control method of any of claims 14 to 26 based on instructions stored by the memory.

28. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions which, when executed by a processor, implement the control method of any one of claims 14 to 26.