Energy storage air conditioning system

Abstract

The application discloses an energy storage air conditioning system, which comprises a controller, at least one energy storage device, an indoor unit, an outdoor unit, a liquid side manifold connected between the indoor unit and the outdoor unit as a refrigerant circulation pipeline, a high-pressure gas pipe and a low-pressure gas pipe, a first end of the energy storage device is connected with the liquid side manifold through an energy storage electronic expansion valve, a second end of the energy storage device is connected with an E port of an energy storage four-way valve through a first electric valve or a first electromagnetic valve, a D port of the energy storage four-way valve is connected with high-pressure refrigerant, an S port of the energy storage four-way valve is connected with the low-pressure gas pipe, and a C port of the energy storage four-way valve is connected with the low-pressure gas pipe through an energy storage throttling element. The application has simpler valve pipeline structure under the premise of realizing multiple functions of the air conditioning system.

Description

Technical Field

[0001] This invention relates to the technical field of air conditioning systems, and more particularly to an energy storage air conditioning system. Background Technology

[0002] A prior art patent with publication number CN107110570B discloses a thermal storage air conditioning unit. When low load demand leads to frequent compressor start-stops or the compressor operates at a low-frequency, low-efficiency point, the compressor's operating frequency is increased, storing excess energy in an energy storage device. This avoids frequent compressor start-stops and bypasses the compressor's low-efficiency point. However, the energy storage device in this prior art has a relatively limited function, only capable of unidirectional energy storage, and cannot meet the diverse needs of users. Furthermore, this prior art fails to integrate with time-of-use electricity pricing policies to use the energy storage device to achieve load shifting and peak shaving.

[0003] Some existing technologies propose air conditioning systems that use heat storage for defrosting. However, since their heat storage is only used for defrosting and their functional range is narrow, they cannot achieve the functions of cold storage and cold release for cooling. Examples include existing patents with publication numbers CN211739591U, CN110440413b, and CN113124508A.

[0004] The aforementioned existing technologies cannot provide both cold storage and cold release functions during refrigeration, resulting in a relatively limited functionality of the energy storage device.

[0005] like Figure 1 As shown, prior art patent CN112752933B discloses an air conditioning system that is suitable for cooling, heating, and energy storage, and has relatively rich functions. Figure 1 It can also be seen that the pipeline design of this existing patent is very complex, using a total of 4 four-way valves, 6 electronic expansion valves and several refrigerant branches to realize the function of the energy storage system, resulting in complex processing technology, increased cost and difficulty in control.

[0006] Figure 1The reference numerals of the accompanying drawings are as follows: 1, air conditioning system; 5, controller (control section); 10, outdoor unit (heat source side unit); 11, compressor; 11a, discharge pipe; 11b, suction pipe; 12, outdoor heat exchanger; 12a, first outdoor heat exchanger; 13, accumulator (refrigerant container); 13a, liquid inflow port; 13b, liquid outflow port; 13c; 14, tank; 13a, gas outflow port; 13b, first gas inflow port; 13c, second gas inflow port; 15, first four-way switching valve; 16, second four-way switching valve; 17, third four-way switching valve; 18, bridge circuit; 18b, second connection point; 18c, third connection point; 18d, fourth connection point; 19a, first check valve; 19b, second check valve; 19c, third check valve; 19d, fourth check valve; 20, heat storage unit; 21, heat storage heat exchanger; 21a, heat storage tank; 21b, heat conducting pipe; 22, fourth four-way switching valve; 23, flow rate adjusting mechanism; 30, flow path switching unit; 31, gas side connection pipe; 32, liquid side connection pipe; 33, gas side main pipe; 33a, switching section first branch pipe; 33b, switching section second branch pipe; 33a, first flow path switching valve; 33b, second flow path switching valve; 35, liquid side main pipe; 36, subcooling heat exchanger; 37, subcooling pipe; 38, flow rate adjusting valve; 40, indoor unit; 41, indoor heat exchanger; 42, indoor expansion valve; 50, refrigerant circuit; 51, outdoor side first gas communication pipe; 52, outdoor side second gas communication pipe; 53, outdoor side liquid communication pipe; 54, intermediate section first gas communication pipe; 55, intermediate section second gas communication pipe; 56, intermediate section liquid communication pipe; 57, indoor side gas communication pipe; 58, indoor side liquid communication pipe; 61, discharge side first branch pipe; 62, discharge side second branch pipe; 64, suction side first branch pipe; 65, suction side second branch pipe; 66, suction side third branch pipe; 67, outdoor low pressure pipe; 68, outdoor side first gas pipe; 69, outdoor side second gas pipe; 71, outdoor side liquid first branch pipe; 72, outdoor side liquid second branch pipe; 73, outdoor side first expansion valve (expansion mechanism); 74, outdoor side second expansion valve (expansion mechanism); 75, outdoor side liquid pipe; 76, outdoor flow rate adjusting valve (first opening and closing mechanism); 77, refrigerant introduction pipe; 78, outdoor check valve; 79, liquid outflow pipe; 80, suction valve (second opening and closing mechanism); 81, suction pipe; 85, heat storage side first gas pipe; 86, heat storage side second gas pipe; 87, heat storage side liquid pipe; 88, first connection pipe (communication path); 89, second connection pipe; 90, heat storage side first flow rate adjusting valve; 91, heat storage side first opening and closing valve; 92, heat storage side first check valve; 93, heat storage side first branch pipe; 94, third connection pipe; 98a, second bypass passage; 99a, heat storage side flow rate adjusting valve;99b, heat storage side third opening and closing valve (solenoid valve).

[0007] Therefore, how to provide an energy storage air conditioning system with rich functions and simple pipeline structure is a technical problem to be solved in the industry. SUMMARY

[0008] In order to solve the technical problem that the pipeline is too complex due to the realization of multiple functions of the accumulator in the prior art, the present application provides an energy storage air conditioning system.

[0009] The energy storage air conditioning system provided by the present application comprises a controller, at least one accumulator, an indoor unit, an outdoor unit, a liquid side main pipe connected between the indoor unit and the outdoor unit as a refrigerant circulation pipeline, a high-pressure gas pipe and a low-pressure gas pipe, a first end of the accumulator is connected with the liquid side main pipe through an energy storage electronic expansion valve, a second end of the accumulator is connected with an E port of an energy storage four-way valve through a first electric valve or a first solenoid valve, a D port of the energy storage four-way valve is connected with high-pressure refrigerant, an S port of the energy storage four-way valve is connected with the low-pressure gas pipe, and a C port of the energy storage four-way valve is connected with the low-pressure gas pipe through an energy storage throttling element.

[0010] Further, the second end of the accumulator is also connected with the liquid side main pipe through a second electric valve or a second solenoid valve, and a third electric valve or a third solenoid valve is arranged on the liquid side main pipe between the first end and the second end of the accumulator.

[0011] Further, the first end of the accumulator is provided with a liquid distribution device.

[0012] Further, the D port of the energy storage four-way valve is connected with an exhaust port of a compressor.

[0013] Further, the D port of the energy storage four-way valve is connected with the high-pressure gas pipe.

[0014] Further, the energy storage throttling element is a capillary tube.

[0015] Further, at least one liquid storage tank connected with the refrigerant circulation pipeline is arranged between the indoor unit and the outdoor unit.

[0016] Further, the liquid storage tank comprises a first inlet connected with the liquid side main pipe through a fifth electric valve or a fifth solenoid valve, a second inlet connected with the high-pressure gas pipe through a sixth electric valve or a sixth solenoid valve, and the second inlet is connected with the low-pressure gas pipe through a throttling element and a seventh electric valve or a second liquid storage throttling element and a seventh solenoid valve, and an outlet connected with the low-pressure gas pipe through a throttling element and a fourth electric valve or a fourth solenoid valve.

[0017] Further, the liquid storage tank comprises a first inlet connected with the liquid side manifold through a fifth electric valve or a fifth electromagnetic valve, and an outlet connected with the low-pressure gas pipe through a first liquid storage throttling element and a fourth electric valve or a fourth electromagnetic valve.

[0018] Further, the controller controls the energy accumulator to store energy during off-peak hours and release energy during peak hours.

[0019] Further, the outdoor unit is provided with a compressor, an outdoor heat exchanger, a refrigeration four-way valve and a heating four-way valve connected with the refrigerant circulation pipeline, and an outdoor expansion valve arranged between the outdoor heat exchanger and an indoor heat exchanger.

[0020] Further, the outdoor unit is provided with an outdoor supercooling device.

[0021] Further, the outdoor heat exchanger is provided with an outdoor distribution device near one end of the outdoor electronic expansion valve.

[0022] Further, the D end of the refrigeration four-way valve is connected with the compressor, the C end of the refrigeration four-way valve is connected with the outdoor heat exchanger, the S end of the refrigeration four-way valve is connected with the gas-liquid separator, and the E end of the refrigeration four-way valve is connected with the S end of the refrigeration four-way valve through a throttling element; and / or

[0023] the D end of the heating four-way valve is connected with the compressor, the C end of the heating four-way valve is connected with the outdoor heat exchanger, the S end of the heating four-way valve is connected with the gas-liquid separator, and the E end of the heating four-way valve is connected with the high-pressure gas pipe.

[0024] Further, the indoor unit comprises an indoor heat exchanger and an indoor electronic expansion valve, and the indoor heat exchanger of each indoor unit is connected with the refrigerant circulation pipeline through a mode converter.

[0025] Further, when the indoor unit is a plurality of indoor units, the controller controls different indoor units to be in the same working state, or controls different indoor units to be in different working states.

[0026] Further, the indoor heat exchanger is provided with an indoor distribution device near one end of the indoor electronic expansion valve.

[0027] The application realizes the simplification of the pipeline of the air conditioning system and the multiple functions of the air conditioning system by connecting the accumulator to the air conditioning system through the energy storage four-way valve. Further, the supercooling mode of the accumulator of the application adopts the second end of the other pipeline connected to the accumulator, so that the accumulator has smaller resistance while realizing the supercooling mode, and the supercooled refrigerant can realize the flow distribution of each flow path by the liquid separation function of the first end. The heat recovery air conditioning system can realize 37 functions such as complete cold storage, complete refrigeration while cold storage, and main refrigeration while cold storage by the cooperation and switching of the three four-way valves and other pipelines and valve pieces, which widens the use range of the energy storage air conditioning system and improves the availability of the energy storage system. In addition, the energy storage air conditioning system of the application stores energy during the low valley electricity price period and releases energy during the peak electricity price period, so as to reduce the power consumption of the air conditioner at this time. The application realizes the "peak load shifting" of the power and reduces the operation cost of the air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be described in detail below with reference to the embodiments and the drawings, in which:

[0029] Figure 1 is a structure diagram of the prior art energy storage air conditioning system.

[0030] Figure 2 is a structure diagram of the energy storage air conditioning system of an embodiment of the application.

[0031] Figure 3a is a refrigerant flow direction schematic diagram of the outdoor unit of the application in an embodiment of complete condensation.

[0032] Figure 3b is a refrigerant flow direction schematic diagram of the outdoor unit of the application in an embodiment of main condensation.

[0033] Figure 3c is a refrigerant flow direction schematic diagram of the outdoor unit of the application in an embodiment of complete evaporation.

[0034] Figure 3d is a refrigerant flow direction schematic diagram of the outdoor unit of the application in an embodiment of main evaporation.

[0035] Figure 3e is a refrigerant flow direction schematic diagram of the outdoor unit of the application in an embodiment of outdoor heat exchanger shutdown.

[0036] Figure 4a is a refrigerant flow direction schematic diagram of the accumulator of the application in an embodiment of evaporation state.

[0037] Figure 4b is a refrigerant flow direction schematic diagram of the accumulator of the application in an embodiment of supercooling state.

[0038] Figure 4cis a schematic view of refrigerant flow in a condensing state in one embodiment of the accumulator of the present application.

[0039] Figure 5a is a schematic view of refrigerant flow in an evaporating state in one embodiment of the indoor unit of the present application.

[0040] Figure 5b is a schematic view of refrigerant flow in a condensing state in one embodiment of the indoor unit of the present application.

[0041] Figure 6 is a schematic view of the structure of the accumulator air conditioning system of another embodiment of the present application.

[0042] Figure 7 is a schematic view of the structure of the accumulator air conditioning system of one embodiment of the present application containing a liquid storage tank.

[0043] Figure 8a is a schematic view of refrigerant flow in a condensing state in one embodiment of the accumulator of the present application. Figure 7

[0044] Figure 8b is a schematic view of refrigerant flow in an evaporating state in one embodiment of the accumulator of the present application. Figure 7

[0045] Figure 9 is a schematic view of the structure of the accumulator air conditioning system of another embodiment of the present application containing a liquid storage tank.

[0046] Figure 10a is a schematic view of refrigerant flow in a condensing state in one embodiment of the accumulator of the present application. Figure 9

[0047] Figure 10b is a schematic view of refrigerant flow in an evaporating state in one embodiment of the accumulator of the present application. Figure 9

[0048] is a schematic view of heat exchange in a supercooling and refrigerant releasing mode in the present application and prior art. Figure 11

[0049] ​​​​BRIEF DESCRIPTION OF DRAWINGS: 1, outdoor unit; 2, accumulator; 3, liquid side main pipe; 4, high pressure gas pipe; 5, low pressure gas pipe; 6, mode converter; 7, indoor unit; 101, compressor; 102, refrigeration four-way valve; 103, heating four-way valve; 104, outdoor heat exchanger; 105, outdoor electronic expansion valve; 106, supercooling electronic expansion valve; 107, outdoor supercooler; 108, gas-liquid separator; 201, accumulator; 201a, first end; 201b, second end; 202, first gas pipe; 203, second gas pipe; 204, first liquid pipe; 205, third gas pipe; 206, accumulator electronic expansion valve; 207, cooling release valve; 208, high pressure gas valve; 209, bypass valve; 210, accumulator four-way valve; 211, liquid distribution device; 212, second liquid pipe; 213, fourth gas pipe; 220, liquid storage tank; 221, liquid inlet valve; 222, pressure valve; 223, liquid outlet valve; 224, gas balance valve; 225, capillary tube; 220a, first inlet; 220b, second inlet; 220c, outlet; 601, supercooler; 602, refrigeration valve; 603, heating valve; 604, third liquid pipe; 605, fifth gas pipe; 701, indoor electronic expansion valve. DETAILED DESCRIPTION

[0050] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0051] Therefore, one feature indicated in the specification will be used to explain one feature of one embodiment of the present application, and it is not implied that each embodiment of the present application must have the explained feature. In addition, it should be noted that the specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0052] The accumulator air conditioning system of the present application can be divided into four parts as a whole, which are controller (not shown in the figure), indoor unit 7, outdoor unit 1, and accumulator 2.

[0053] The indoor unit 7 and the outdoor unit 1 are connected through the refrigerant circulation pipeline, the accumulator 2 has a first end 201a and a second end 201b, and the first end and the second end of the accumulator 2 are connected to the refrigerant circulation pipeline through the valve pipe assembly respectively.

[0054] Figure 2The first embodiment of the present application is shown in which three pipes are connected between the indoor unit 7 and the outdoor unit 1 for refrigerant circulation, and the refrigerant circulation pipes include the liquid-side main pipe 3, the high-pressure gas pipe 4 and the low-pressure gas pipe 5.

[0055] The outdoor unit 1 is provided with a compressor 101, an outdoor heat exchanger 104, a refrigeration four-way valve 102 and a heating four-way valve 103 connected with the refrigeration circulation circuit. The outdoor unit 1 is also provided with an outdoor expansion valve arranged between the outdoor heat exchanger 104 and the indoor heat exchanger. The controller controls the refrigeration four-way valve 102, the heating four-way valve 103 and the outdoor expansion valve, so that the outdoor unit 1 is in different working modes.

[0056] In this embodiment, the outdoor unit 1 can also be provided with an outdoor supercooling device 107, which can further improve the supercooling degree of the refrigerant when the supercooling degree of the refrigerant flowing out of the outdoor heat exchanger 104 is not enough. After the supercooling degree of the refrigerant is improved, the refrigerant enters the liquid-side main pipe 3. The end of the outdoor heat exchanger 104 close to the outdoor electronic expansion valve 105 can also be provided with an outdoor distribution device, which can adapt the refrigerant to the spatial distribution characteristics of the air volume in the heat exchanger in the heating working condition, so that the refrigerant enters the outdoor heat exchanger for evaporation in an optimal distribution ratio, thereby achieving the best heat exchange effect.

[0057] In this embodiment, the specific connection mode of the compressor 101 of the outdoor unit 1 with the outdoor heat exchanger 104, the liquid-side main pipe 3, the high-pressure gas pipe 4 and the low-pressure gas pipe 5 of the outdoor unit 1 through the refrigeration four-way valve 102 and the heating four-way valve 103 is as follows: the D end of the refrigeration four-way valve 102 is connected with the compressor 101, the C end of the refrigeration four-way valve 102 is connected with the outdoor heat exchanger 104, the S end of the refrigeration four-way valve 102 is connected with the gas-liquid separator 108, and the E end of the refrigeration four-way valve 102 is connected with the S end of the refrigeration four-way valve 102 through a throttling element (such as a capillary tube). The D end of the heating four-way valve 103 is connected with the compressor 101, the C end of the heating four-way valve 103 is connected with the S end of the heating four-way valve 103 through a capillary tube, the S end of the heating four-way valve 103 is connected with the gas-liquid separator 108, and the E end of the heating four-way valve 103 is connected with the high-pressure gas pipe 4. The present application can realize the functions of continuous heating and defrosting through the setting of the refrigeration four-way valve and the heating four-way valve, and the pipeline is more simple.

[0058] The indoor unit 7 in the energy storage air conditioning system is provided with multiple indoor units 7, and in other embodiments, only one indoor unit 7 can be provided. Each indoor unit 7 can be connected with the liquid-side main pipe 3, the high-pressure gas pipe 4 and the low-pressure gas pipe 5 through the mode converter 6.

[0059] The indoor unit 7 comprises an indoor heat exchanger and an indoor electronic expansion valve 701. The indoor heat exchanger of each indoor unit 7 is connected to the refrigerant circulation pipeline through the mode converter 6. The controller controls the indoor electronic expansion valve 701 and the mode converter 6 so that the indoor unit 7 is in different working states.

[0060] Figure 2 The main part of the mode converter is shown in the middle. The mode converter comprises two parts. The first part is connected to one end of the indoor unit 7 provided with the indoor electronic expansion valve 701, i.e. the third liquid pipe 604 connected to the indoor unit. The indoor electronic expansion valve 701 is arranged on the third liquid pipe 604. The second part is connected to the other end of the indoor unit 7, i.e. the fifth gas pipe 605 connected to the indoor unit. The first part comprises a subcooler 601 connected to the liquid-side header 3 and the low-pressure gas pipe 5. The second part comprises two branches, each provided with a corresponding electric valve or electromagnetic valve, and connected to the low-pressure gas pipe 5 and the high-pressure gas pipe 4, respectively. In a specific embodiment, the branch connected to the low-pressure gas pipe 5 is provided with a refrigeration valve 602, and the branch connected to the high-pressure gas pipe 4 is provided with a heating valve 603.

[0061] When the energy storage air conditioning system is provided with multiple indoor units 7, the controller can control different indoor units 7 to be in the same working state, such as evaporation state or condensation state. The controller can also control different indoor units 7 to be in different working states, such as some indoor units 7 in evaporation state and some indoor units 7 in condensation state.

[0062] In this embodiment, the indoor unit 7 can also be provided with an indoor liquid distribution device near the end of the indoor heat exchanger close to the indoor electronic expansion valve 701. Through the indoor liquid distribution device, the refrigerant can be adapted to the spatial distribution characteristics of the air volume in the indoor heat exchanger in the refrigeration working condition, so as to enter the indoor heat exchanger for evaporation in an optimal distribution ratio, thereby achieving the best heat exchange effect.

[0063] In this embodiment, the first end 201a of the accumulator 201 is connected to the liquid-side header 3 through the energy storage electronic expansion valve 206. The second end 201b of the accumulator 201 is connected to the E port of the energy storage four-way valve 210 through the first electric valve or the first electromagnetic valve. The D end of the energy storage four-way valve 210 is connected to the high-pressure refrigerant. The S port of the energy storage four-way valve 210 is connected to the low-pressure gas pipe 5. The C port of the energy storage four-way valve 210 is connected to the low-pressure gas pipe 5 through the energy storage throttling element. The second end 201b of the accumulator 201 is also connected to the liquid-side header 3 through the second electric valve or the second electromagnetic valve. The third electric valve or the third electromagnetic valve is arranged on the liquid-side header 3 between the first end 201a and the second end 201b of the accumulator 201.

[0064] Reference Figure 2In this embodiment, the valve pipe assembly of the accumulator 2 connecting the refrigerant circulation pipeline comprises a second liquid pipe provided with an accumulator electronic expansion valve. The first end 201a of the accumulator 2 is provided with a liquid distribution device 211, which is connected with the liquid side manifold 3 through a second liquid pipe 212 provided with an accumulator electronic expansion valve 206. The valve pipe assembly of the accumulator 2 connecting the refrigerant circulation pipeline further comprises an accumulator four-way valve, a first gas pipe to a fourth gas pipe. The first gas pipe connects the D end of the accumulator four-way valve with the high-pressure refrigerant, the second gas pipe connects the S port of the accumulator four-way valve with the low-pressure gas pipe, the third gas pipe connects the E port of the accumulator four-way valve with the second end of the accumulator, and the fourth gas pipe connects the C port of the accumulator four-way valve with the low-pressure gas pipe. The first solenoid valve on the third gas pipe is specifically a high-pressure gas valve 208, and the accumulator throttling element is provided on the fourth gas pipe 213. In this embodiment, the accumulator throttling element is specifically a capillary tube. The first gas pipe 202 connects the D end of the accumulator four-way valve with the exhaust port of the compressor.

[0065] The second end 201b of the accumulator 2 is further connected with the liquid side manifold 3 through a first liquid pipe 204 provided with an electric valve or a solenoid valve. In a specific embodiment, the second solenoid valve on the first liquid pipe is a cooling release valve 207. A third electric valve or a third solenoid valve is provided on the liquid side manifold 3 between the first liquid pipe 204 and the second liquid pipe 212. In a specific embodiment, the third solenoid valve is a bypass valve 209. The controller controls the valve pipe assembly and the cooling release valve so that the refrigerant enters the accumulator through the first end or the second end in the corresponding working mode of the accumulator.

[0066] The accumulator 201 is filled with an accumulator material and provided with a refrigerant pipe. The refrigerant flows in the pipe and exchanges heat with the accumulator material sufficiently, which can store cold and release cold, or store heat and release heat.

[0067] The controller can realize refrigerant circulation flow paths with multiple different functions through the switching combination of the above three four-way valves.

[0068] The working mode of the outdoor unit has five options, which are complete condensing mode, main condensing mode, complete evaporation mode, main evaporation mode, and outdoor heat exchanger shutdown mode. The working mode of the outdoor unit of the present application can be at least one of the five modes.

[0069] The controller controls the working mode (also referred to as the working state) of the outdoor unit mainly through the valves in the following table.

[0070]

[0071] Table 1: Working mode of outdoor unit and corresponding valve state

[0072] As Figure 3aAs shown, when the outdoor heat exchanger 104 is used as a condenser, the refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 104 to be condensed, and then enters the liquid-side header 3 after passing through the outdoor subcooler 107. The evaporated refrigerant returns to the gas-liquid separator 108 and the compressor 101 through the low-pressure gas pipe 5. The complete condensation of the present application means that all the refrigerant discharged from the compressor is condensed in the outdoor heat exchanger.

[0073] As shown, when the outdoor heat exchanger 104 is used as a condenser, the refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 104 to be condensed, and then enters the liquid-side header 3 after passing through the outdoor subcooler 107. The evaporated refrigerant returns to the gas-liquid separator 108 and the compressor 101 through the low-pressure gas pipe 5. The complete condensation of the present application means that all the refrigerant discharged from the compressor is condensed in the outdoor heat exchanger. Figure 3b As shown, when the outdoor heat exchanger 104 is used as a condenser, the refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 104 to be condensed, and then enters the liquid-side header 3 after passing through the outdoor subcooler 107. The evaporated refrigerant returns to the gas-liquid separator 108 and the compressor 101 through the low-pressure gas pipe 5. The complete condensation of the present application means that all the refrigerant discharged from the compressor is condensed in the outdoor heat exchanger.

[0074] As shown, when the outdoor heat exchanger 104 is used as a condenser, the refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 104 to be condensed, and then enters the liquid-side header 3 after passing through the outdoor subcooler 107. The evaporated refrigerant returns to the gas-liquid separator 108 and the compressor 101 through the low-pressure gas pipe 5. The complete condensation of the present application means that all the refrigerant discharged from the compressor is condensed in the outdoor heat exchanger. Figure 3c As shown, when the outdoor heat exchanger 104 is used as a condenser, the refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 104 to be condensed, and then enters the liquid-side header 3 after passing through the outdoor subcooler 107. The evaporated refrigerant returns to the gas-liquid separator 108 and the compressor 101 through the low-pressure gas pipe 5. The complete condensation of the present application means that all the refrigerant discharged from the compressor is condensed in the outdoor heat exchanger.

[0075] As shown, when the outdoor heat exchanger 104 is used as a condenser, the refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 104 to be condensed, and then enters the liquid-side header 3 after passing through the outdoor subcooler 107. The evaporated refrigerant returns to the gas-liquid separator 108 and the compressor 101 through the low-pressure gas pipe 5. The complete condensation of the present application means that all the refrigerant discharged from the compressor is condensed in the outdoor heat exchanger. Figure 3d As shown, when the outdoor heat exchanger 104 is used as a condenser, the refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 104 to be condensed, and then enters the liquid-side header 3 after passing through the outdoor subcooler 107. The evaporated refrigerant returns to the gas-liquid separator 108 and the compressor 101 through the low-pressure gas pipe 5. The complete condensation of the present application means that all the refrigerant discharged from the compressor is condensed in the outdoor heat exchanger.

[0076] As shown, when the outdoor heat exchanger 104 is used as a condenser, the refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 104 to be condensed, and then enters the liquid-side header 3 after passing through the outdoor subcooler 107. The evaporated refrigerant returns to the gas-liquid separator 108 and the compressor 101 through the low-pressure gas pipe 5. The complete condensation of the present application means that all the refrigerant discharged from the compressor is condensed in the outdoor heat exchanger. Figure 3eAs shown, when the outdoor heat exchanger is turned off, the outdoor heat exchanger 104 does not work. The refrigerant discharged from the compressor 101 enters the accumulator 201 and / or the indoor unit 7 (which acts as a condenser) via the heating four-way valve 103 and the high-pressure gas pipe 4 for condensation. The refrigerant discharged from the accumulator 201 and / or the indoor unit 7 (which acts as an evaporator) returns to the gas-liquid separator 108 and the compressor 101 via the low-pressure gas pipe 5.

[0077] The accumulator has four operating modes: evaporation mode, subcooling mode, condensation mode, and no-operation mode.

[0078] The controller controls the operating mode (also known as the operating state) of the accumulator 201 mainly through the valves in the table below.

[0079]

[0080] Table 2. Operating modes of accumulators and their corresponding valve states

[0081] The energy storage device 201 of the present invention can operate in at least one of these four modes. Figure 4a to Figure 4c The evaporation mode, subcooling mode, and condensation mode of the energy accumulator of the present invention are shown.

[0082] like Figure 4a As shown, when the accumulator operates in evaporation mode, the accumulator 201 acts as an evaporator. The refrigerant, after being throttled by the accumulator electronic expansion valve 206, enters the accumulator 201 for evaporation and flows out through the third gas pipe 205 and the second gas pipe 203. In this state, the two-phase refrigerant enters through the first end 201a of the accumulator and the liquid separator 211, and flows out from the second end 201b of the accumulator.

[0083] The evaporation state can be further subdivided into evaporation (cold storage) and evaporation (heat release). The difference between these two states lies in the initial state of the accumulator 201 and their respective purposes. When the accumulator 201 has not yet stored any cold or heat, it can enter the evaporation (cold storage) state. In this state, the condensed refrigerant enters the accumulator 201 to store the cold energy, preparing for the next cold release. When the accumulator 201 has already stored heat, it can enter the evaporation (heat release) state. The condensed refrigerant enters the accumulator 201, absorbing the heat stored in the accumulator and evaporating, with the purpose of undertaking part or all of the evaporation load of the refrigeration cycle.

[0084] like Figure 4bAs shown, when the accumulator operates in subcooling mode, the accumulator 201 acts as a subcooler. Refrigerant enters the accumulator 201 through the first liquid pipe 204 for subcooling, and after increasing the subcooling degree, flows out through the second liquid pipe 212. In this state, liquid refrigerant enters through the second end 201b of the accumulator and flows out from the first end 201a of the accumulator and the liquid distribution device 211.

[0085] When the refrigerant at the inlet has a high dryness, the proportion of gaseous state is high, and it enters the accumulator 201 from the first liquid pipe 204 without passing through the liquid separator, resulting in less resistance.

[0086] In subcooling mode, gaseous refrigerant or gas-liquid mixture refrigerant enters the second end of the accumulator from the first liquid pipe. After being subcooled into a liquid state in the accumulator, the gaseous refrigerant or gas-liquid mixture flows out of the accumulator through the liquid distribution device 211. The flow rate distribution of each flow path can still be achieved by the liquid distribution function of the liquid distribution device 211 at the first end.

[0087] like Figure 4c As shown, when the accumulator operates in condensation mode, the accumulator 201 acts as a condenser. Refrigerant enters the accumulator 201 through the first gas pipe 202 and the third gas pipe 205 for condensation, and then flows out through the second liquid pipe 212. In this state, gaseous refrigerant enters through the second end 201b of the accumulator, and after condensation, liquid refrigerant flows out from the first end 201a of the accumulator and the liquid separator 211.

[0088] The condensation state can be further subdivided into condensation (cold release) and condensation (heat storage). The difference between these two states lies in the different initial states and purposes of the accumulator 201. The accumulator 201 can only enter the condensation (cold release) state after it has stored cold energy. In this state, high-temperature, high-pressure refrigerant enters the accumulator 201, absorbs the stored cold energy, and evaporates, aiming to handle part or all of the condensation load of the refrigeration cycle. When the accumulator 201 has not yet stored any cold or heat energy, it can enter the condensation (heat storage) state. In this state, high-temperature, high-pressure refrigerant enters the accumulator 201, storing heat in it, preparing for the next heat release.

[0089] From the above description of the three working modes of the accumulator, it can be seen that in the supercooling mode, the outdoor heat exchanger 104 can reduce the fan power and only bear a small condensation load, and the accumulator bears most of the condensation load, thereby reducing power consumption. At this time, the outlet refrigerant state of the outdoor heat exchanger 104 is gaseous or a gas-liquid mixed state with a high proportion of gas, and enters the second end of the accumulator from the first liquid pipe in this state, without passing through the liquid separation device to enter the accumulator, so that the accumulator bears a large condensation load while reducing the resistance of the refrigerant operation. Moreover, when the refrigerant is supercooled to a liquid state in the accumulator and flows out of the accumulator through the liquid separation device 211, the flow distribution of each flow path can still be realized by means of the liquid separation function of the liquid separation device 211.

[0090] In order to further illustrate the difference between the above technical solution of the present application and the prior patent CN112752933B, the prior art and the present application are further compared in detail.

[0091] From Figure 1 it can be seen that the second branch pipe 98 on the heat storage side and the flow regulating valve (opening degree regulating valve) 99a on the heat storage side are located on the right side of the accumulator, i.e., upstream of the accumulator, in the supercooling mode. The second liquid pipe 212 and the electronic expansion valve 206 of the present application are both located downstream of the accumulator in the supercooling mode. Therefore, through comparison, it can be seen that if the accumulator of the prior patent is to be installed with a liquid separation device, the refrigerant needs to enter the accumulator through the liquid separation device in the supercooling mode, and the gas-liquid two-phase or gaseous refrigerant will bear a large resistance at this time, causing a large pressure loss. Moreover, as shown in Figure 11 , in the supercooling mode (i.e., "cold heat storage operation" in the original text of the patent) and the supercooling release mode (i.e., "refrigeration peak shift operation") of the prior patent, the refrigerant enters the accumulator from the same end. In the supercooling mode, the temperature of the accumulator gradually increases along the path due to heat exchange of the refrigerant, so after the supercooling ends, the temperature of the accumulator material forms a distribution rule of gradually increasing along the path (T3→T4). Subsequently, in the release mode, the high-temperature refrigerant enters the accumulator for heat exchange and cooling (T1→T2), and the heat exchange temperature difference gradually decreases, and the heat exchange effect is poor. The pipeline connection design of the present application makes the flow directions of the supercooling and release processes opposite, and the two counter-flow heat exchanges have a relatively constant heat exchange temperature difference along the path, which can achieve a better heat exchange effect, and the outlet temperature of the refrigerant obtained in the release is also lower (T2’<T2), achieving a better energy-saving effect. Similarly, in the heat storage and release modes, the present application can also realize counter-flow heat exchange, achieve a better heat exchange effect, and achieve a better energy-saving effect.

[0092] In addition to the difference in the accumulator, Figure 1 and the Figure 2Compared with the prior art, the pipeline structure of the present application is more complex, and more devices are used, and the system cost is higher.

[0093] The indoor unit comprises an indoor heat exchanger and an indoor electronic expansion valve, the indoor heat exchanger of each indoor unit is connected with the liquid-side main pipe, the high-pressure gas pipe and the low-pressure gas pipe through a mode converter, and the controller controls the indoor electronic expansion valve and the mode converter to make the indoor unit in different working states, i.e. working modes.

[0094] The working mode of the indoor unit has two options, i.e. evaporation mode and condensation mode.

[0095] The controller controls the working mode (also referred to as working state) of the indoor unit mainly through the valves (including the valve of the mode converter) in the following table.

[0096]

[0097] Table 3: Working mode of indoor unit and corresponding valve state

[0098] As shown in Figure 5a , when the indoor unit is in the evaporation mode, the indoor unit 7 functions as an evaporator. The refrigerant enters the indoor unit through the third liquid pipe 604 to evaporate and flows out through the refrigeration valve 602.

[0099] As shown in Figure 5b , when the indoor unit is in the condensation mode, the indoor unit 7 functions as a condenser. The refrigerant enters the indoor unit through the heating valve 603 to condense and flows out through the third liquid pipe 604.

[0100] The controller of the present application can realize 37 functions, such as normal complete refrigeration, normal main refrigeration, complete cold storage, cold storage with complete refrigeration, cold storage with complete heating (outdoor unit condensation), cold storage with complete heating (outdoor unit evaporation), cold storage with main refrigeration, cold storage with main heating (outdoor unit evaporation), cold storage with main heating (outdoor unit condensation), supercooling release with complete refrigeration, supercooling release with main refrigeration, condensation release with complete refrigeration, condensation release with main refrigeration, parallel release with complete refrigeration, parallel release with main refrigeration, normal complete heating, normal main heating, complete heat storage, heat storage with complete heating, heat storage with complete refrigeration (outdoor unit evaporation), heat storage with complete refrigeration (outdoor unit condensation), heat storage with main heating, heat storage with main refrigeration (outdoor unit condensation), heat storage with main refrigeration (outdoor unit evaporation), mixed release with complete heating, mixed release with main heating, independent release with complete heating, independent release with main heating, non-continuous heating defrosting, continuous heating defrosting with complete heating, continuous heating defrosting with main heating, continuous heating defrosting with main refrigeration, normal heat recovery, cold storage with heat recovery, heat storage with heat recovery, release with heat recovery, release with heat recovery, etc., by switching, combining different working states of the outdoor unit, the accumulator and the indoor unit, and opening and closing the bypass valve 209, as shown in the following table. In the indoor unit / mode converter column, evaporation > condensation means that part of the indoor units are evaporating and part of the indoor units are condensing, and the evaporation load is greater than the condensation load; evaporation < condensation means that part of the indoor units are evaporating and part of the indoor units are condensing, and the evaporation load is less than the condensation load.

[0101]

[0102]

[0103] Table 4: 37 functions realized by the controller by switching, combining the working modes of different parts

[0104] As shown in Figure 6 the second embodiment of the present application, one end of the first gas pipe 202 originally connected to the compressor exhaust port is changed to be connected to the high-pressure gas pipe 4, and the opening and closing of the remaining valves and the refrigerant flow path are consistent with those of the first embodiment.

[0105] As shown in Figure 7 on the basis of the above two embodiments, a liquid storage tank can be further added, at least one liquid storage tank is provided between the indoor unit and the outdoor unit, the storage and release of refrigerant by the liquid storage tank controls the refrigerant amount under different operating modes, so that the system circulating refrigerant amount is consistent with the refrigerant demand amount under different operating modes, and the best heat exchange effect is achieved.

[0106] The liquid storage tank 220 has three interfaces. The liquid storage tank comprises a first inlet connected with the liquid side manifold through the fifth electric valve or the fifth electromagnetic valve, a second inlet connected with the high-pressure gas pipe through the sixth electric valve or the sixth electromagnetic valve, and the second inlet is connected with the low-pressure gas pipe through the second liquid storage throttling element and the seventh electric valve or the second liquid storage throttling element and the seventh electromagnetic valve, and an outlet connected with the low-pressure gas pipe through the first liquid storage throttling element and the fourth electric valve or the fourth electromagnetic valve.

[0107] In specific implementation, the first liquid storage throttling element is a capillary tube 225, the fourth electromagnetic valve is a liquid discharge valve 223, the fifth electromagnetic valve is a liquid inlet valve 221, the sixth electromagnetic valve is a pressurizing valve 222, the second liquid storage throttling element is a capillary tube, the seventh electromagnetic valve is a gas balance valve 224, the first inlet 202a is connected with the liquid side manifold 3 through the liquid inlet valve 221, the second inlet 220b is connected with the high-pressure gas pipe 4 through the pressurizing valve 222, and is connected with the low-pressure gas pipe 5 through the capillary tube and the gas balance valve 224, and the outlet 220c is connected with the low-pressure gas pipe 5 through the capillary tube 225 and the liquid discharge valve 223.

[0108] As shown in Figure 8a , Figure 8b , the liquid storage tank 220 has three states: non-working, storing refrigerant and releasing refrigerant, and the three states can be used in different system modes (normal refrigeration, full cold storage, etc.).

[0109] When the liquid storage tank is not working, the liquid inlet valve 221, the pressurizing valve 222, the liquid discharge valve 223 and the gas balance valve 224 are all closed.

[0110] When it is judged that the current operation mode needs to start storing refrigerant, the liquid inlet valve 221 and the gas balance valve 224 are opened, and the pressurizing valve 222 and the liquid discharge valve 223 are closed. The gas balance valve 224 is opened, so that the tank body pressure of the liquid storage tank 220 is in a low-pressure state, the liquid inlet valve 221 is opened, so that the refrigerant inlet pipe of the liquid storage tank 220 is in a medium-pressure section, and the refrigerant enters the liquid storage tank 220 under the action of the pressure difference.

[0111] When it is judged that the current operation mode needs to start releasing refrigerant from the refrigerant tank, the liquid inlet valve 221 and the gas balance valve 224 are closed, and the pressurizing valve 222 and the liquid discharge valve 223 are opened. The liquid discharge valve 223 is opened, so that the outlet end of the liquid storage tank 220 is in a low-pressure state, the pressurizing valve 222 is opened, so that the tank body pressure of the liquid storage tank 220 is in a high-pressure state, and the refrigerant in the tank body is discharged from the tank body under the action of gravity and pressure difference, and enters the pipeline circulation.

[0112] As shown in Figure 9As shown, the application also provides another specific embodiment of the liquid storage tank, which only has two interfaces: the first inlet 220a and the outlet 220c. The liquid storage tank comprises: the first inlet connected with the liquid side manifold through the fifth electric valve or the fifth electromagnetic valve, and the outlet connected with the low-pressure gas pipe through the first liquid storage throttling element and the fourth electric valve or the fourth electromagnetic valve.

[0113] In the implementation, the inlet 220a is connected with the liquid side manifold 3 through the gas balance valve 224, and the outlet 220c is connected with the low-pressure gas pipe 5 through the liquid discharge valve 223 and the capillary tube 225.

[0114] As shown in the drawings, Figure 10a , Figure 10b The liquid storage tank 220 has three states: non-working, storing refrigerant and releasing refrigerant, and the three states can be used in different system modes (normal refrigeration, full cold storage, etc.).

[0115] When the liquid storage tank is not working, the liquid discharge valve 223 and the gas balance valve 224 are closed.

[0116] When it is judged that the current operation mode needs to start storing refrigerant, the liquid discharge valve 223 and the gas balance valve 224 are opened, and the refrigerant enters the liquid storage tank 220 under the action of the pressure difference.

[0117] When it is judged that the current operation mode needs to start releasing refrigerant from the refrigerant tank, the gas balance valve 224 is closed, the liquid discharge valve 223 is opened, and the refrigerant in the tank body is discharged from the tank body under the action of gravity and pressure difference and enters the pipeline circulation.

[0118] On the basis of the above embodiment, the controller of the application can also control the energy accumulator to store energy during the off-peak electricity price period and release energy during the peak electricity price period, fully utilize the advantages of the energy storage air conditioning system, and reduce the electricity cost of the user.

[0119] On the basis of the above embodiment, the pipeline connection structure corresponding to the refrigeration four-way valve or the heating four-way valve can only use one set of pipeline connection structure, and the other set can combine the pipeline connection method in the prior art.

[0120] On the basis of the above embodiment, the skilled in the art can increase the number of energy accumulators, and the pipeline connection structure of the newly added energy accumulators can refer to the above embodiment of the application, which all belong to the protection scope of the application.

[0121] The above only describes the preferred embodiments of the application and is not used to limit the application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An energy storage air conditioning system comprising a controller, at least one energy storage device, an indoor unit, an outdoor unit, a liquid-side header connected between the indoor unit and the outdoor unit as a refrigerant circulation line, a high-pressure gas pipe, and a low-pressure gas pipe, characterized in that, The first end of the accumulator is connected with the liquid side manifold through an accumulator electronic expansion valve, the second end of the accumulator is connected with the E port of an accumulator four-way valve through a first electric valve or a first electromagnetic valve, the D port of the accumulator four-way valve is connected with high pressure refrigerant, the S port of the accumulator four-way valve is connected with the low pressure gas pipe, and the C port of the accumulator four-way valve is connected with the low pressure gas pipe through an accumulator throttling element.

2. The energy storage air conditioning system of claim 1, wherein, The second end of the accumulator is also connected with the liquid side manifold through a second electric valve or a second electromagnetic valve, and a third electric valve or a third electromagnetic valve is arranged on the liquid side manifold between the first end and the second end of the accumulator.

3. The energy storage air conditioning system of claim 1, wherein, The first end of the accumulator is provided with a liquid distribution device.

4. The energy storage air conditioning system of claim 1, wherein, The D port of the accumulator four-way valve is connected with the exhaust port of the compressor.

5. The energy storage air conditioning system of claim 1, wherein, The D port of the accumulator four-way valve is connected with the high pressure gas pipe.

6. The energy storage air conditioning system of claim 1, wherein, The accumulator throttling element is a capillary tube.

7. The energy storage air conditioning system of claim 1, wherein, At least one liquid storage tank connected with the refrigerant circulation pipeline is arranged between the indoor unit and the outdoor unit.

8. The energy storage air conditioning system of claim 7, wherein, The liquid storage tank comprises a first inlet connected with the liquid side manifold through a fifth electric valve or a fifth electromagnetic valve, a second inlet connected with the high pressure gas pipe through a sixth electric valve or a sixth electromagnetic valve, and the second inlet is connected with the low pressure gas pipe through a throttling element and a seventh electric valve or a second liquid storage throttling element and a seventh electromagnetic valve, and an outlet connected with the low pressure gas pipe through a throttling element and a fourth electric valve or a fourth electromagnetic valve.

9. The energy storage air conditioning system of claim 7, wherein, The liquid storage tank comprises a first inlet connected with the liquid side manifold through a fifth electric valve or a fifth electromagnetic valve, and an outlet connected with the low pressure gas pipe through a first liquid storage throttling element and a fourth electric valve or a fourth electromagnetic valve.

10. The energy storage air conditioning system according to any one of claims 1 to 9, wherein The controller controls the accumulator to store energy during off-peak electricity price period and release energy during peak electricity price period.

11. The energy storage air conditioning system according to any one of claims 1 to 9, wherein The outdoor unit is provided with a compressor, an outdoor heat exchanger, a refrigeration four-way valve and a heating four-way valve connected with the refrigerant circulation pipeline, and an outdoor electronic expansion valve arranged between the outdoor heat exchanger and an indoor heat exchanger.

12. The energy storage air conditioning system of claim 11, wherein, The outdoor unit is provided with an outdoor subcooling device.

13. The energy storage air conditioning system of claim 11, wherein, The outdoor heat exchanger is provided with an outdoor liquid distribution device at one end close to the outdoor electronic expansion valve.

14. The energy storage air conditioning system of claim 11, wherein, The D port of the refrigeration four-way valve is connected with the compressor, the C port of the refrigeration four-way valve is connected with the outdoor heat exchanger, the S port of the refrigeration four-way valve is connected with a gas-liquid separator, the E port of the refrigeration four-way valve is connected with the S port of the refrigeration four-way valve through a throttling element; and / or The D port of the heating four-way valve is connected with the compressor, the C port of the heating four-way valve is connected with the S port of the heating four-way valve through a throttling element, the S port of the heating four-way valve is connected with a gas-liquid separator, and the E port of the heating four-way valve is connected with the high pressure gas pipe.

15. The energy storage air conditioning system according to any one of claims 1 to 9, wherein The indoor unit comprises an indoor heat exchanger and an indoor electronic expansion valve, and the indoor heat exchanger of each indoor unit is connected with the refrigerant circulation pipeline through a mode converter.

16. The energy storage air conditioning system of claim 15, wherein, When the indoor unit is multiple indoor units, the controller controls different indoor units to be in the same working state, or the controller controls different indoor units to be in different working states.

17. The energy storage air conditioning system of claim 15, wherein, The indoor heat exchanger is provided with an indoor liquid distribution device at one end close to the indoor electronic expansion valve.

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