Heat exchange loop and heat storage system

Abstract

The invention relates to a heat exchange loop and a heat storage system, and belongs to the technical field of heat exchange equipment. The heat exchange loop comprises a compressor, a gas separator, a first heat exchanger, a second heat exchanger, a pressure equalizing piece, an outdoor heat exchange assembly and a first control valve. The heat storage system comprises a first water tank, a second water tank, a sixth control valve, a seventh control valve and the heat exchange loop. By the adoption of the heat storage system, in the defrosting state, the heat exchange loop can conduct defrosting and continuous heating, and therefore the heating efficiency of the heat storage system is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heat exchange equipment, and in particular to a heat exchange loop and a heat storage system. Background Art

[0002] With the increasing emphasis on energy conservation, the heat storage system has come into being. The heat storage system includes a heat exchange circuit and a water circuit. When the heat storage system is heating, the heat of the refrigerant in the heat exchange circuit is used to heat the water in the water circuit for domestic water or heating. In winter, since the outdoor temperature is below 0℃, when the heat storage system is heating, the outdoor heat exchanger in the heat exchange circuit is prone to frost, which affects the heating efficiency of the heat storage system. Therefore, the outdoor heat exchanger needs to be defrosted.

[0003] Typically, a heat storage system uses a four-way valve to change the flow direction of the refrigerant in the heat exchange circuit, thereby achieving the purpose of defrosting the outdoor heat exchanger.

[0004] When this traditional defrosting mode is used, the heat storage system will stop heating during defrosting, which affects the heating efficiency of the heat storage system. Summary of the invention

[0005] The embodiments of the present disclosure provide a heat exchange circuit and a heat storage system, which can solve the technical problems existing in the related technologies. The technical solutions are as follows:

[0006] The embodiment of the present disclosure provides a heat exchange circuit, which includes a compressor, a gas separator, a first heat exchanger, a second heat exchanger, a pressure equalizing element, an outdoor heat exchange component and a first control valve;

[0007] The compressor has a first air inlet, a first air outlet, and a second air outlet, and the air pressure at the first air outlet is greater than that at the second air outlet;

[0008] The gas separator has a first interface and a second interface, and the second interface is connected to the first air inlet;

[0009] The first heat exchanger has a third interface and a fourth interface, and the third interface is connected to the second air outlet;

[0010] The second heat exchanger has a fifth interface and a sixth interface;

[0011] The pressure equalizing member has a seventh interface and an eighth interface, the seventh interface is connected to the sixth interface, and the pressure equalizing member is used to reduce the pressure difference between the sixth interface and the fourth interface outputting the refrigerant;

[0012] The outdoor heat exchange component has a ninth interface and a tenth interface, and the ninth interface is connected to the fourth interface and the eighth interface respectively;

[0013] The first control valve is connected to the first air outlet, the first interface, the fifth interface and the tenth interface respectively. The first control valve is used to connect the first air outlet with the fifth interface and the first interface with the tenth interface in the first state, and to connect the first air outlet with the tenth interface and the first interface with the fifth interface in the second state.

[0014] In a possible implementation, the heat exchange circuit further includes a third heat exchanger and a first throttle valve, and the compressor has a second air inlet;

[0015] The third heat exchanger has an eleventh interface, a twelfth interface, a thirteenth interface and a fourteenth interface. Inside the third heat exchanger, the eleventh interface is connected to the thirteenth interface, the twelfth interface is connected to the fourteenth interface, the eleventh interface is respectively connected to the fourth interface and the eighth interface, and the twelfth interface is connected to the second air inlet;

[0016] The first throttle valve has a fifteenth interface and a sixteenth interface, the fifteenth interface is connected to the fourteenth interface, and the sixteenth interface is respectively connected to the ninth interface and the thirteenth interface.

[0017] In a possible implementation, the heat exchange circuit further includes a controller, which is used to:

[0018] When receiving a heat storage instruction, switching the first control valve to the first state, determining the difference between the temperature of the heating object of the first heat exchanger and the second heat exchanger and the heating target temperature when the first control valve is in the first state, determining a first opening based on the difference, and controlling the first throttle valve based on the first opening;

[0019] When a defrost command is received, the first control valve is switched to the second state, and when the first throttle valve is in the second state, the first throttle valve is controlled to be closed.

[0020] In a possible implementation, the heat exchange circuit further includes a second control valve and a third control valve;

[0021] The second control valve has a seventeenth interface and an eighteenth interface, and the eighteenth interface is connected to the fourth interface and the eleventh interface respectively;

[0022] The third control valve has a nineteenth interface and a twentieth interface, the nineteenth interface is respectively connected to the eighth interface and the seventeenth interface, and the twentieth interface is respectively connected to the ninth interface, the thirteenth interface and the sixteenth interface.

[0023] In a possible implementation, the controller is electrically connected to the first throttle valve, the first control valve, the second control valve, and the third control valve, respectively, for:

[0024] When a heat storage instruction is received, the first control valve is switched to the first state. When the first control valve is in the first state, the difference between the temperature of the heating object of the first heat exchanger and the second heat exchanger and the heating target temperature is determined. When the difference is greater than a difference threshold, the second control valve is controlled to be opened and the third control valve is controlled to be closed. Based on a first corresponding relationship between the difference and the opening, a second opening corresponding to the difference is determined. Based on the second opening, the first throttle valve is controlled. When the difference is less than the difference threshold, the second control valve is controlled to be closed and the third control valve is controlled to be opened. Based on a second corresponding relationship between the difference and the opening, a third opening corresponding to the difference is determined. Based on the third opening, the first throttle valve is controlled.

[0025] When a defrost command is received, the first control valve is switched to the second state, the second control valve is controlled to close, the third control valve is controlled to open, the difference between the temperature of the heating object of the first heat exchanger and the heating target temperature is determined, and based on the second corresponding relationship, the fourth opening corresponding to the difference is determined, and the first throttle valve is controlled based on the fourth opening.

[0026] In a possible implementation, the heat exchange circuit further includes a fourth control valve and a fifth control valve;

[0027] The fourth control valve has a twenty-first interface and a twenty-second interface, the twenty-first interface is connected to the fourth interface and the eighteenth interface respectively, and the twenty-second interface is connected to the eleventh interface;

[0028] The fifth control valve has a twenty-third interface and a twenty-fourth interface, the twenty-third interface is connected to the thirteenth interface and the sixteenth interface respectively, and the twenty-fourth interface is connected to the ninth interface and the twentieth interface respectively.

[0029] In a possible implementation, the controller is electrically connected to the first throttle valve, the first control valve, the second control valve, the third control valve, the fourth control valve, and the fifth control valve, respectively.

[0030] In a possible implementation, the pressure equalizing element is a throttle valve, which is used to reduce the pressure of the refrigerant output from the sixth interface by a specified value.

[0031] In a possible implementation manner, the first control valve is a four-way valve.

[0032] In one possible implementation, the outdoor heat exchange assembly includes an outdoor heat exchanger and a second throttle valve, one interface of the outdoor heat exchanger is connected to an interface of the second throttle valve, another interface of the outdoor heat exchanger is the tenth interface, and another interface of the second throttle valve is the ninth interface.

[0033] The embodiment of the present disclosure provides a heat storage system, the heat storage system comprising a first water tank, a second water tank, a sixth control valve, a seventh control valve, and a heat exchange circuit as described above;

[0034] The first heat exchanger included in the heat exchange circuit also has a first water inlet and a first water outlet, the second heat exchanger included in the heat exchange circuit also has a second water inlet and a second water outlet, the first water tank has a twenty-fifth interface and a twenty-sixth interface, the second water tank has a twenty-seventh interface and a twenty-eighth interface, the sixth control valve has a twenty-ninth interface and a thirtieth interface, and the seventh control valve has a thirty-first interface and a thirty-second interface;

[0035] The 31st interface is connected to the water source and the first water inlet respectively, the 32nd interface is connected to the 30th interface and the second water inlet respectively, the 29th interface is connected to the 26th interface, the first water outlet is connected to the 27th interface, and the second water outlet is connected to the 25th interface.

[0036] In a possible implementation, the heat storage system further includes an eighth control valve;

[0037] The eighth control valve has a thirty-third interface and a thirty-fourth interface. The thirty-third interface is respectively connected to the first water outlet and the twenty-seventh interface. The thirty-fourth interface is respectively connected to the thirtieth interface, the second water inlet and the thirty-second interface.

[0038] The technical solution provided by the embodiments of the present disclosure includes at least the following beneficial effects:

[0039] The heat exchange circuit includes a first heat exchanger and a second heat exchanger. In the heat storage state (i.e., the first state of the first control valve), the first heat exchanger and the second heat exchanger can both be used for heating. In the defrosting state (i.e., the second state of the first control valve), the first heat exchanger can still be used for heating. In this way, in the defrosting state, the heat exchange circuit can both defrost and continue to heat, thereby improving the heating efficiency of the heat exchange circuit.

[0040] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 is a structural schematic diagram of a heat exchange circuit shown in an embodiment of the present disclosure;

[0043] Figure 2 is a structural schematic diagram of a heat exchange circuit shown in an embodiment of the present disclosure;

[0044] Figure 3 is a structural schematic diagram of a heat exchange circuit shown in an embodiment of the present disclosure;

[0045] Figure 4 is a structural schematic diagram of a heat storage system shown in an embodiment of the present disclosure;

[0046] Figure 5 is a structural schematic diagram of a heat storage system shown in an embodiment of the present disclosure;

[0047] Figure 6 is a structural schematic diagram of a heat storage system shown in an embodiment of the present disclosure;

[0048] Figure 7 is a structural schematic diagram of a heat storage system shown in an embodiment of the present disclosure;

[0049] Figure 8 is a structural schematic diagram of a heat storage system shown in an embodiment of the present disclosure;

[0050] Fig. 9 is a structural schematic diagram of a heat storage system shown in an embodiment of the present disclosure;

[0051] Fig.10 It is a structural schematic diagram of a heat storage system shown in an embodiment of the present disclosure.

[0052] Legend:

[0053] 1. Compressor;

[0054] 11. First air inlet; 12. First air outlet; 13. Second air outlet; 14. Second air inlet;

[0055] 2. Qi;

[0056] 21. First interface; 22. Second interface;

[0057] 3. The first heat exchanger;

[0058] 31. Third interface; 32. Fourth interface; 33. First water inlet; 34. First water outlet;

[0059] 4. Second heat exchanger;

[0060] 41. fifth interface; 42. sixth interface; 43. second water inlet; 44. second water outlet;

[0061] 5. Pressure equalizing parts;

[0062] 51, seventh interface; 52, eighth interface;

[0063] 6. Outdoor heat exchange components;

[0064] 61. Ninth interface; 62. Tenth interface;

[0065] 7. The first control valve;

[0066] 8. The third heat exchanger;

[0067] 81, the eleventh interface; 82, the twelfth interface; 83, the thirteenth interface; 84, the fourteenth interface;

[0068] 9. First throttle valve;

[0069] 91, the fifteenth interface; 92, the sixteenth interface;

[0070] 100. Second control valve;

[0071] 101, seventeenth interface; 102, eighteenth interface;

[0072] 110. The third control valve;

[0073] 111, nineteenth interface; 112, twentieth interface;

[0074] 120. Outdoor heat exchanger;

[0075] 130, second throttle valve;

[0076] 150. First water tank;

[0077] 151, the twenty-fifth interface; 152, the twenty-sixth interface;

[0078] 160, second water tank;

[0079] 161, interface 27; 162, interface 28;

[0080] 170, sixth control valve;

[0081] 171, interface 29; 172, interface 30;

[0082] 180, seventh control valve;

[0083] 181, the 31st interface; 182, the 32nd interface;

[0084] 190, eighth control valve;

[0085] 191, the 33rd interface; 192, the 34th interface;

[0086] 200, fourth control valve;

[0087] 201, interface 21; 202, interface 22;

[0088] 210, fifth control valve;

[0089] 211, the twenty-third interface; 212, the twenty-fourth interface. DETAILED DESCRIPTION

[0090] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0091] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent disclosure specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0092] The heat storage system uses a compressor, a heat exchanger, and a throttle valve to change the temperature and state of the refrigerant. The heat exchanger transfers the heat of the refrigerant to achieve the purpose of cooling or heating the target object. In winter, when the heat storage system heats the target object, the outdoor heat exchanger is prone to frost because the outdoor temperature is below 0°C, which affects the heating efficiency of the air source heat pump system. Therefore, the outdoor heat exchanger needs to be defrosted. When the air source heat pump system is defrosting, it will stop heating the target object. At this time, the heating efficiency of the air source heat pump system is zero, affecting the user's comfort.

[0093] The present disclosure provides a heat storage system, which includes a heat exchange circuit and a water circuit. Figure 4As shown, the heat exchange circuit includes a compressor 1, a gas separator 2, a first heat exchanger 3, a second heat exchanger 4, a pressure equalizing element 5, an outdoor heat exchange component 6 and a first control valve 7, and the water circuit includes a first water tank 150, a second water tank 160, a sixth control valve 170 and a seventh control valve 180.

[0094] Among them, in the heat exchange circuit, the compressor 1 has a first air inlet 11, a first air outlet 12 and a second air outlet 13, the gas separator 2 has a first interface 21 and a second interface 22, the second interface 22 is connected to the first air inlet 11, the first heat exchanger 3 has a third interface 31, a fourth interface 32, a first water inlet 33 and a first water outlet 34, the third interface 31 is connected to the second air outlet 13, the second heat exchanger 4 has a fifth interface 41, a sixth interface 42, a second water inlet 43 and a second water outlet 44, the pressure equalizing member 5 has a seventh interface 51 and an eighth interface 52, the seventh interface 51 is connected to the sixth interface 42, the outdoor heat exchange component 6 has a ninth interface 61 and a tenth interface 62, the ninth interface 61 is respectively connected to the fourth interface 32 and the eighth interface 52, and the first control valve 7 is respectively connected to the first air outlet 12, the first interface 21, the fifth interface 41, and the tenth interface 62. The outdoor heat exchange component 6 includes an outdoor heat exchanger 120 and a second throttle valve 130. One interface of the outdoor heat exchanger 120 is connected to one interface of the second throttle valve 130. Another interface of the outdoor heat exchanger 120 is the tenth interface 62, and another interface of the second throttle valve 130 is the ninth interface 61.

[0095] In the water circuit, the first water tank 150 has a twenty-fifth interface 151 and a twenty-sixth interface 152, the second water tank 160 has a twenty-seventh interface 161 and a twenty-eighth interface 162, the sixth control valve 170 has a twenty-ninth interface 171 and a thirtieth interface 172, and the seventh control valve 180 has a thirty-first interface 181 and a thirty-second interface 182. The thirty-first interface 181 is respectively connected to the water source and the first water inlet 33, the thirty-second interface 182 is respectively connected to the thirtieth interface 172 and the second water inlet 43, the twenty-ninth interface 171 is connected to the twenty-sixth interface 152, the first water outlet 34 is connected to the twenty-seventh interface 161, and the second water outlet 44 is connected to the twenty-fifth interface 151.

[0096] In this way, when the heat storage system is in the heat storage state, the refrigerant passing through the first heat exchanger 3 and the second heat exchanger 4 can be used to heat water. The compressor 1 can provide two refrigerants with different temperatures and pressures. The refrigerant flowing out of the first air outlet 12 is high temperature and high pressure, and the refrigerant flowing out of the second air outlet 13 has a lower pressure and a lower temperature than the refrigerant flowing out of the first air outlet 12. In the water circuit, cold water flows through the first heat exchanger 3, absorbs the heat of the refrigerant flowing through the first heat exchanger 3, and stores the heated water in the second water tank. Cold water flows through the second heat exchanger 4, absorbs the heat of the refrigerant flowing through the second heat exchanger 4, and stores the heated water in the first water tank.

[0097] When the heat storage system is in the defrosting state, the first heat exchanger 3 is always used to heat water, and the refrigerant in the second heat exchanger 4 can absorb the heat of the water in the first water tank and be used to defrost the outdoor heat exchanger. In this way, during the defrosting stage, the heat storage system can not only defrost, but also continuously provide heat, thereby greatly improving the heating efficiency of the heat storage system. When the user needs to defrost quickly or the energy storage in the first water tank 150 is insufficient, part of the hot water in the first heat exchanger 3 can be introduced into the second heat exchanger 4 to assist in defrosting.

[0098] The following are the various components of the thermal storage system:

[0099] 1. Compressor 1

[0100] The compressor 1 is a component in the thermal storage system that compresses the refrigerant to increase the temperature and pressure of the refrigerant.

[0101] like Figure 4 As shown, the compressor 1 has a first air inlet 11, a first air outlet 12, and a second air outlet 13. The first air inlet 11 of the compressor is connected to the second interface 22 of the gas separator 2, the first air outlet 12 is connected to the first control valve 7, and the second air outlet 13 is connected to the third interface 31 of the first heat exchanger 3.

[0102] In implementation, the first air inlet 11 of the compressor 1 can be connected to the second interface 22 of the gas separator 2 through a pipeline, the first air outlet 12 can be connected to the first control valve 7 through a pipeline, and the second air outlet 13 can be connected to the third interface 31 of the first heat exchanger 3 through a pipeline. The inner diameters of the above-mentioned pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0103] The compressor 1 includes a cylinder body and a piston. The cylinder body has a piston cavity (not shown). The piston is slidably connected to the piston cavity. The piston moves to compress the low-temperature and low-pressure refrigerant entering the piston cavity, and the temperature of the compressed refrigerant increases. In the process of the compressor 1 compressing the refrigerant, energy is converted into electrical energy, which is converted into the mechanical energy of the piston, and then converted into the internal energy of the refrigerant.

[0104] The compressor 1 may be a double-exhaust compressor, which may provide two refrigerants at different temperatures and pressures.

[0105] Optionally, the compressor 1 may be a scroll compressor. A scroll compressor has the characteristics of smaller axial size and lower noise. Compared with a piston compressor, a scroll compressor can reduce the size of the external unit after the integrated compressor 1, and can also reduce the working noise of the external unit when the indoor air temperature control system is working.

[0106] Optionally, two single exhaust compressors may be used instead of the double exhaust compressor, and the pressure and temperature of the compressed refrigerant provided by the two single exhaust compressors should be different.

[0107] 2. Gas 2

[0108] Gas separator 2 is a component for separating gas phase refrigerant in the thermal storage system.

[0109] like Figure 4 As shown, the gas separator 2 has a first interface 21 and a second interface 22. The first interface 21 is connected to the first control valve 7, and the second interface 22 is connected to the first air inlet 11 of the compressor 1. The gas-liquid mixed refrigerant flows through the gas separator 2 to separate the gas phase refrigerant, and then the gas phase refrigerant is transported to the compressor 1.

[0110] In practice, the first interface 21 can be connected to the first control valve 7 through a pipeline, and the second interface 22 can be connected to the first air inlet 11 through a pipeline. The inner diameters of the above pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0111] 3. The first heat exchanger 3

[0112] The first heat exchanger 3 is a component that realizes heat transfer between two or more fluids at different temperatures, and can transfer heat from a fluid with a higher temperature to a fluid with a lower temperature.

[0113] like Figure 4 As shown, the first heat exchanger 3 has a third interface 31, a fourth interface 32, a first water inlet 33 and a first water outlet 34. The third interface 31 is connected to the second air outlet 13 of the compressor 1, the fourth interface 32 is respectively connected to the eighth interface 52 of the pressure equalizing member 5 and the ninth interface 61 of the outdoor heat exchange component 6, the first water inlet 33 is respectively connected to the water source and the thirty-first interface 181 of the seventh control valve 180, and the first water outlet 34 is connected to the twenty-seventh interface 161 of the second water tank 160.

[0114] In implementation, the third interface 31 can be connected to the second air outlet 13 through a pipeline, the fourth interface 32 can be connected to the eighth interface 52 and the ninth interface 61 through pipelines, and the first water inlet 33 can be connected to the water source and the thirty-first interface 181 through pipelines. The first water outlet 34 can be connected to the twenty-seventh interface 161 through a pipeline. The inner diameters of the above-mentioned pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0115] In one example, the first heat exchanger 3 may be a plate heat exchanger. A plate heat exchanger is a new type of high-efficiency heat exchanger formed by stacking corrugated metal sheets. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates.

[0116] 4. Second heat exchanger 4

[0117] The second heat exchanger 4 is a component that realizes heat transfer between two or more fluids at different temperatures, and can transfer heat from a fluid with a higher temperature to a fluid with a lower temperature.

[0118] like Figure 4 As shown, the second heat exchanger 4 has a fifth interface 41, a sixth interface 42, a second water inlet 43 and a second water outlet 44. The fifth interface 41 is respectively connected to the first control valve 7, the first air outlet 12 of the compressor 1, and the first interface 21 of the gas separator 2, the sixth interface 42 is connected to the seventh interface 51 of the pressure equalizing member 5, the second water inlet 43 is respectively connected to the 30th interface 172 of the sixth control valve 170 and the 32nd interface 182 of the seventh control valve 180, and the second water outlet 44 is connected to the 25th interface 151 of the first water tank 150.

[0119] In implementation, the fifth interface 41 can be connected to the first control valve 7, the first air outlet 12, and the first interface 21 through a pipeline, the sixth interface 42 can be connected to the seventh interface 51 through a pipeline, the second water inlet 43 can be connected to the thirtieth interface 172 and the thirty-second interface 182 through a pipeline, and the second water outlet 44 can be connected to the twenty-fifth interface 151 through a pipeline. The inner diameters of the above-mentioned pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0120] In one example, the second heat exchanger 4 may be a plate heat exchanger. The plate heat exchanger is a new type of high-efficiency heat exchanger made of stacked corrugated metal sheets. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates.

[0121] 5. Pressure equalizing parts 5

[0122] The pressure equalizing member 5 is a component for adjusting the pressure of the refrigerant in the branch circuit.

[0123] like Figure 4 As shown, the pressure equalizing member 5 has a seventh interface 51 and an eighth interface 52. The seventh interface 51 is connected to the sixth interface 42 of the second heat exchanger 4, and the eighth interface 52 is connected to the ninth interface 61 of the outdoor heat exchange component 6 and the fourth interface 32 of the first heat exchanger 3 respectively.

[0124] In implementation, the seventh interface 51 can be connected to the sixth interface 42 through a pipeline, and the eighth interface 52 can be connected to the ninth interface 61 and the fourth interface 32 through a pipeline. The inner diameters of the above pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0125] In one example, the pressure equalizing member may be a throttle valve, and the throttle valve may control the flow rate of the fluid passing through the throttle valve by adjusting the opening, thereby achieving the purpose of controlling the fluid pressure.

[0126] The throttle valve may be a needle-type throttle valve, a groove-type throttle valve, or a window-type throttle valve. The embodiment of the present disclosure does not limit the type of the throttle valve.

[0127] 6. Outdoor heat exchange components 6

[0128] like Figure 4 As shown, the outdoor heat exchange component 6 has a ninth interface 61 and a tenth interface 62. The ninth interface 61 is respectively connected to the fourth interface 32 of the first heat exchanger 3 and the eighth interface 52 of the pressure equalizing component 5. The tenth interface 62 is respectively connected to the first control valve 7, the first air outlet 12 of the compressor 1, the first interface 21 of the gas separator 2, and the fifth interface 41 of the second heat exchanger 4.

[0129] In implementation, the ninth interface 61 can be connected to the fourth interface 32 and the eighth interface 52 through pipelines, and the tenth interface 62 can be connected to the first control valve 7, the first air outlet 12, the first interface 21, and the fifth interface 41 through pipelines. The inner diameters of the above pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0130] The outdoor heat exchange assembly 6 includes an outdoor heat exchanger 120 and a second throttle valve 130 , one interface of the outdoor heat exchanger 120 is connected to one interface of the second throttle valve 130 , the other interface of the outdoor heat exchanger 120 is the tenth interface 62 , and the other interface of the second throttle valve 130 is the ninth interface 61 .

[0131] The outdoor heat exchanger 120 is also a heat exchanger that can transfer heat from a high-temperature fluid flowing through the outdoor heat exchanger 120 to a low-temperature fluid flowing through the outdoor heat exchanger 120 .

[0132] In one example, when the thermal storage system is heating, the outdoor heat exchanger 120 can transfer the heat of the air to the low-temperature refrigerant flowing through the outdoor heat exchanger, thereby increasing the temperature of the refrigerant. In winter, due to the low outdoor temperature, the pipes in the outdoor heat exchanger 120 that are in contact with the air will frost, thereby affecting the heating efficiency of the thermal storage system.

[0133] The second throttle valve 130 can control the flow rate of the fluid passing through the throttle valve by adjusting the opening, thereby achieving the purpose of controlling the fluid pressure.

[0134] The throttle valve may be a needle-type throttle valve, a groove-type throttle valve, or a window-type throttle valve. The embodiment of the present disclosure does not limit the type of the throttle valve.

[0135] 7. First control valve 7

[0136] The first control valve 7 is a component that can adjust the direction, flow rate, speed and other parameters of the fluid. In the embodiment of the present disclosure, the first control valve 7 is mainly used to adjust the direction of the fluid.

[0137] like Figure 4 As shown, the first control valve 7 is respectively connected to the first air outlet 12 of the compressor 1, the first interface 21 of the gas separator 2, the fifth interface 41 of the second heat exchanger 4, and the tenth interface 62 of the outdoor heat exchange component 6.

[0138] In practice, the first control valve 7 can be connected to the first gas outlet 12, the first interface 21, the fifth interface 41, and the tenth interface 62 through pipelines. The inner diameters of the above pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0139] In one example, the first control valve 7 is a four-way valve, and interfaces of the four-way valve can be connected to interfaces of various components in the system through pipelines.

[0140] 8. The first water tank 150

[0141] The first water tank 150 is a component for storing water.

[0142] like Figure 4 As shown, the first water tank 150 has a twenty-fifth interface 151 and a twenty-sixth interface 152 , the twenty-fifth interface 151 is connected to the second water outlet 44 of the second heat exchanger 4 , and the twenty-sixth interface 152 is connected to the twenty-ninth interface 171 of the sixth control valve 170 .

[0143] In practice, the twenty-fifth interface 151 can be connected to the second water outlet 44 through a pipeline, and the twenty-sixth interface 152 can be connected to the twenty-ninth interface 171 through a pipeline. The inner diameters of the above pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0144] In one example, the first water tank 150 is an insulated water tank, which refers to a component that adds special industrial and thermal insulation materials to the interlayer of the water tank to keep the water in the water tank at a certain temperature. The insulated water tank can be a stainless steel insulated water tank, a pressure insulated water tank, or a fiberglass insulated water tank.

[0145] 9. Second water tank 160

[0146] The second water tank 160 is a component for storing water.

[0147] like Figure 4 As shown, the second water tank 160 has a twenty-seventh interface 161 and a twenty-eighth interface 162 , and the twenty-seventh interface 161 is connected to the first water outlet 34 of the first heat exchanger 3 .

[0148] In implementation, the twenty-seventh interface 161 may be connected to the first water outlet 34 via a pipe. The inner diameters of the pipes may be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipes.

[0149] In one example, the second water tank 160 is an insulated water tank, which refers to a component that adds special industrial and thermal insulation materials to the interlayer of the water tank to keep the water in the water tank at a certain temperature. The insulated water tank can be a stainless steel insulated water tank, a pressure insulated water tank, or a fiberglass insulated water tank, etc.

[0150] The first water tank 150 and the second water tank 160 may be the same water tank.

[0151] 10. Sixth control valve 170

[0152] The sixth control valve 170 is a component that can adjust the direction, flow rate, speed and other parameters of the fluid. In the embodiment of the present disclosure, the sixth control valve 170 is mainly used to control the on-off of the fluid.

[0153] like Figure 4 As shown, the sixth control valve 170 has a twenty-ninth interface 171 and a thirtieth interface 172. The twenty-ninth interface 171 is connected to the twenty-sixth interface 152 of the first water tank 150, and the thirtieth interface 172 is respectively connected to the thirty-second interface 182 of the seventh control valve 180 and the second water inlet 43 of the second heat exchanger 4.

[0154] In implementation, the twenty-ninth interface 171 can be connected to the twenty-sixth interface 152 through a pipeline, and the thirtieth interface 172 can be connected to the thirty-second interface 182 and the second water inlet 43 through a pipeline. The inner diameters of the above-mentioned pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0155] In one example, the sixth control valve 170 is a solenoid valve.

[0156] 11. Seventh control valve 180

[0157] The seventh control valve 180 is a component that can adjust the direction, flow rate, speed and other parameters of the fluid. In the embodiment of the present disclosure, the seventh control valve 180 is mainly used to control the on-off of the fluid.

[0158] like Figure 4 As shown, the seventh control valve 180 has a thirty-first interface 181 and a thirty-second interface 182. The thirty-first interface 181 is respectively connected to the water source and the first water inlet 33 of the first heat exchanger 3, and the thirty-second interface 182 is respectively connected to the thirtieth interface 172 of the sixth control valve 170 and the second water inlet 43 of the second heat exchanger 4.

[0159] In implementation, the thirty-first interface 181 can be connected to the water source and the first water inlet 33 through pipes, and the thirty-second interface 182 can be connected to the thirtieth interface 172 and the second water inlet 43 through pipes. The inner diameters of the above pipes can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipe.

[0160] In one example, the seventh control valve 180 is a solenoid valve.

[0161] The heat storage system may further include a controller, which may be electrically connected to the pressure equalizing element 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180 and the second throttle valve 130 respectively. The controller may provide an electrical control signal input to achieve the purpose of controlling the refrigerant in the heat exchange system and the water in the water circuit.

[0162] In implementation, when a heat storage instruction is received, the controller controls the pressure equalizing element 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180 and the second throttle valve 130. The controller controls the pressure equalizing element 5 based on the pressure difference of the refrigerant output by the sixth interface 42 and the fourth interface 32, so as to achieve the purpose of cooling and reducing the pressure of the refrigerant output by the sixth interface 42. The controller controls the first control valve 7 to connect the first air outlet 12 with the fifth interface 41 and the first interface 21 with the tenth interface 62. The controller controls the sixth control valve 170 to close and the seventh control valve 180 to open. The controller controls the opening of the second throttle valve 130, thereby cooling and reducing the pressure of the refrigerant flowing through the second throttle valve 130.

[0163] The flow direction of the refrigerant in the heat exchange circuit is as follows: Figure 4As shown, the heat exchange circuit that outputs the refrigerant from the first air outlet 12 of the compressor 1 is called a high-pressure circuit, and the heat exchange circuit that outputs the refrigerant from the second air outlet 13 of the compressor 1 is called a low-pressure circuit. The flow direction of the refrigerant in the high-pressure circuit is as follows: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the second heat exchanger 4 through the first air outlet 12 and the first control valve 7, and then flows through the pressure equalizing member 5, the outdoor heat exchange component 6, the first control valve 7, the gas separator 2 in sequence, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure circuit is as follows: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the outdoor heat exchange component 6, the first control valve 7, the gas separator 2 in sequence, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle.

[0164] The flow direction of water in the waterway is as follows: Figure 4 As shown, water in the water source flows to the first water inlet 33 of the first heat exchanger 3 and the second water inlet 43 of the second heat exchanger 4 respectively, and the water flowing to the first water inlet 33 flows out from the first water outlet 34 of the first heat exchanger 3, and the heated water flows to the second water tank 160. The water flowing to the second water inlet 43 flows out from the second water outlet 44 of the second heat exchanger 4, and the heated water flows to the first water tank 150. After a sufficiently long time, the temperature of the water in the first water tank 150 can theoretically reach a temperature greater than that of the water in the second water tank 160.

[0165] In implementation, when a defrost command is received, the controller controls the pressure equalizing component 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180 and the second throttle valve 130. The controller sets the pressure equalizing component 5 to a state in which the refrigerant can flow completely through and the refrigerant flowing through the pressure equalizing component 5 does not change at all. The controller controls the first control valve 7 to connect the first air outlet 12 with the tenth interface 62 and the first interface 21 with the fifth interface 41. The controller controls the sixth control valve 170 to open and the seventh control valve 180 to close. The controller controls the opening of the second throttle valve 130, thereby reducing the temperature and pressure of the refrigerant flowing through the second throttle valve 130.

[0166] The flow direction of the refrigerant in the heat exchange circuit is as follows: Figure 4As shown, the heat exchange circuit that outputs the refrigerant from the first air outlet 12 of the compressor 1 is called a high-pressure circuit, and the heat exchange circuit that outputs the refrigerant from the second air outlet 13 of the compressor 1 is called a low-pressure circuit. The flow direction of the refrigerant in the high-pressure circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the outdoor heat exchange component 6 through the first air outlet 12 and the first control valve 7, and then flows through the pressure equalizing component 5, the second heat exchanger 4, the first control valve 7, and the gas separator 2 in sequence, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the pressure equalizing component 5, the second heat exchanger 4, the first control valve 7, and the gas separator 2 in sequence, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle.

[0167] The flow direction of water in the waterway is as follows: Figure 4 As shown, all the water in the water source flows to the first water inlet 33 of the first heat exchanger 3, and the water flowing to the first water inlet 33 flows out from the first water outlet 34 of the first heat exchanger 3, and the heated water flows to the second water tank 160. Another water path for providing heat flows out from the twenty-sixth interface 152 of the first water tank 150, flows to the second heat exchanger 4 through the sixth control valve 170, and the water in the water path after providing heat in the second heat exchanger 4 can flow back to the first water tank 150, or the water in the water path can be set to flow to other places according to actual needs.

[0168] Alternatively, if Figure 5 As shown, an eighth control valve 190 can be added to the water circuit. The eighth control valve 190 has a thirty-third interface 191 and a thirty-fourth interface 192. The thirty-third interface 191 is respectively connected to the first water outlet 34 and the twenty-seventh interface 161, and the thirty-fourth interface 192 is respectively connected to the thirtieth interface 172, the second water inlet 43 and the thirty-second interface 182. The eighth control valve 190 controls the water circuit. In the heat storage state, the controller controls the eighth control valve 190 to be closed, and the flow direction of water in the water circuit is exactly the same as the flow direction of water in the heat storage system without the eighth control valve 190. In the defrosting state, the controller can choose whether to open the eighth control valve 190. If the eighth control valve 190 is opened, the water flowing out of the first water outlet 34 can also flow to the second water inlet 43, thereby providing heat for the second heat exchanger 4.

[0169] Below, some optional structural features of the thermal storage system are introduced:

[0170] Structural feature 1. The heat storage system further includes a third heat exchanger 8 and a first throttle valve 9 , and the compressor 1 has a second air inlet 14 .

[0171] The third heat exchanger 8 is a component that realizes heat transfer between two or more fluids at different temperatures, and can transfer heat from a fluid with a higher temperature to a fluid with a lower temperature. The first throttle valve 9 has similar functions to the second throttle valve 130, and the function of the second throttle valve 130 can be referred to. Figure 6 As shown, the third heat exchanger 8 is used in conjunction with the second throttle valve 130, and the refrigerant passes through the eleventh interface 81 of the third heat exchanger 8 and flows out from the thirteenth interface 83. When the first throttle valve 9 is in an open state, the refrigerant flowing out from the thirteenth interface 83 will pass through the first throttle valve 9, thereby reducing the temperature and pressure, and then flow back to the third heat exchanger 8. After passing through the third heat exchanger 8, the refrigerant absorbs heat and is completely converted into the gas phase, thereby achieving the purpose of "replenishing air" for the compressor 1 and increasing the efficiency of the compressor 1.

[0172] like Figure 6 As shown, the third heat exchanger 8 has an eleventh interface 81, a twelfth interface 82, a thirteenth interface 83 and a fourteenth interface 84. Inside the third heat exchanger 8, the eleventh interface 81 is connected with the thirteenth interface 83, the twelfth interface 82 is connected with the fourteenth interface 84, the eleventh interface 81 is respectively connected with the fourth interface 32 and the eighth interface 52, and the twelfth interface 82 is connected with the second air inlet 14.

[0173] In implementation, the eleventh interface 81 can be connected to the fourth interface 32 and the eighth interface 52 through a pipeline, and the twelfth interface 82 can be connected to the second air inlet 14 through a pipeline. The inner diameters of the above pipelines can be the same or different, and the embodiment of the disclosure does not limit the inner diameter of the pipeline.

[0174] In one example, the third heat exchanger 8 is a plate economizer.

[0175] The first throttle valve 9 has a fifteenth port 91 and a sixteenth port 92 . The fifteenth port 91 is connected to the fourteenth port 84 , and the sixteenth port 92 is connected to the ninth port 61 and the thirteenth port 83 , respectively.

[0176] In implementation, the fifteenth interface 91 can be connected to the fourteenth interface 84 through a pipeline, and the sixteenth interface 92 can be connected to the ninth interface 61 and the thirteenth interface 83 through pipelines. The inner diameters of the above pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0177] The heat storage system may further include a controller, which may be electrically connected to the pressure equalizing element 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180, the second throttle valve 130 and the first throttle valve 9 respectively. The controller may provide an electrical control signal input to achieve the purpose of controlling the refrigerant in the heat exchange system and the water in the water circuit.

[0178] In implementation, when a heat storage instruction is received, the controller controls the pressure equalizing component 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180, the second throttle valve 130 and the first throttle valve 9. The controller controls the pressure equalizing component 5 based on the pressure difference between the sixth interface 42 and the fourth interface 32 outputting the refrigerant, so as to achieve the purpose of cooling and reducing the pressure of the refrigerant output from the sixth interface 42. The controller controls the first control valve 7 to connect the first air outlet 12 with the fifth interface 41 and the first interface 21 with the tenth interface 62. The controller controls the sixth control valve 170 to close and controls the seventh control valve 180 to close. The control valve 180 is opened, and the controller controls the opening of the second throttle valve 130, thereby reducing the temperature and pressure of the refrigerant flowing through the second throttle valve 130. The controller determines the first opening based on the difference between the temperature of the heating object of the first heat exchanger 3 and the second heat exchanger 4 and the heating target temperature, and controls the first throttle valve 9 based on the first opening. When the first heat exchanger 3 and the second heat exchanger 4 heat different targets respectively, the controller determines the first opening based on the sum of the two differences. When the first heat exchanger 3 and the second heat exchanger 4 heat the same target, the controller determines the first opening based on the average of the two differences. The larger the sum of the two differences or the average of the two differences, the larger the first opening determined by the controller.

[0179] The flow direction of the refrigerant in the heat exchange circuit is as follows: Figure 6As shown, the heat exchange circuit that outputs the refrigerant from the first air outlet 12 of the compressor 1 is called a high-pressure circuit, the heat exchange circuit that the refrigerant eventually flows to the second air inlet 14 of the compressor 1 is called a high-pressure branch circuit, and the heat exchange circuit that the refrigerant eventually flows to the first air inlet 11 of the compressor 1 is called a high-pressure main circuit. The heat exchange circuit that outputs the refrigerant from the second air outlet 13 of the compressor 1 is called a low-pressure circuit, the heat exchange circuit that the refrigerant eventually flows to the second air inlet 14 of the compressor 1 is called a low-pressure branch circuit, and the heat exchange circuit that the refrigerant eventually flows to the first air inlet 11 of the compressor 1 is called a low-pressure main circuit. The flow direction of the refrigerant in the high-pressure main circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the second heat exchanger 4 through the first air outlet 12 and the first control valve 7, and then flows through the pressure equalizing member 5, the third heat exchanger 8, the outdoor heat exchange component 6, the first control valve 7, the gas separator 2, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the high-pressure branch circuit is as follows: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the second heat exchanger 4 through the first air outlet 12 and the first control valve 7, and then flows through the pressure equalizing component 5, the third heat exchanger 8, the first throttle valve 9 in sequence, and finally flows to the second air inlet 14 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure main circuit is as follows: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the third heat exchanger 8, the outdoor heat exchange component 6, the first control valve 7, the gas separator 2 in sequence, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure branch circuit is as follows: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the third heat exchanger 8, the first throttle valve 9 in sequence, and finally flows to the second air inlet 14 of the compressor 1 to complete the cycle.

[0180] The flow direction of water in the water channel is completely consistent with the flow direction of water in the above-mentioned water channel in the heat storage state.

[0181] In implementation, when receiving a defrost instruction, the controller controls the pressure equalizing member 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180, the second throttle valve 130 and the first throttle valve 9. The controller sets the pressure equalizing member 5 to a state where the refrigerant can flow completely through and the refrigerant flowing through the pressure equalizing member 5 does not change at all. The controller controls the first control valve 7 to connect the first air outlet 12 with the tenth interface 62 and the first interface 21 with the fifth interface 41. The controller controls the sixth control valve 170 to open and the seventh control valve 180 to close. The controller controls the opening of the second throttle valve 130, thereby reducing the temperature and pressure of the refrigerant flowing through the second throttle valve 130. The controller controls the first throttle valve 9 to close.

[0182] The flow direction of the refrigerant in the heat exchange circuit is as follows: Figure 6As shown, the heat exchange circuit that outputs the refrigerant from the first air outlet 12 of the compressor 1 is called a high-pressure circuit, and the heat exchange circuit that outputs the refrigerant from the second air outlet 13 of the compressor 1 is called a low-pressure circuit. The flow direction of the refrigerant in the high-pressure circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the outdoor heat exchange component 6 through the first air outlet 12 and the first control valve 7, and then flows through the third heat exchanger 8, the pressure equalizing member 5, the second heat exchanger 4, the first control valve 7, the gas separator 2, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the pressure equalizing member 5, the second heat exchanger 4, the first control valve 7, the gas separator 2, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle.

[0183] The flow direction of water in the water channel is completely consistent with the flow direction of water in the above-mentioned water channel in the defrosting state.

[0184] Alternatively, if Figure 7 As shown, an eighth control valve 190 can be added to the water circuit, and the flow direction of water in the water circuit with the eighth control valve 190 added is completely consistent with the flow direction of water in the water circuit with the eighth control valve 190 added as described above.

[0185] Compared with the original heat storage system, the heat storage system with structural feature 1 can add an "air supplement" branch (i.e., a branch of the high-pressure circuit or the low-pressure circuit) during heat storage, thereby improving the efficiency of the compressor 1.

[0186] Structural feature two: Based on structural feature one, the heat storage system further includes a second control valve 100 and a third control valve 110 .

[0187] The functions of the second control valve 100 and the third control valve 110 are similar to those of the seventh control valve 180 , and reference may be made to the introduction to the function of the seventh control valve 180 .

[0188] The second control valve 100 has a seventeenth port 101 and an eighteenth port 102 . The eighteenth port 102 is connected to the fourth port 32 and the eleventh port 81 , respectively.

[0189] In implementation, the eighteenth interface 102 can be connected to the fourth interface 32 and the eleventh interface 81 through pipelines. The inner diameters of the above pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0190] The third control valve 110 has a nineteenth interface 111 and a twentieth interface 112. The nineteenth interface 111 is respectively connected to the eighth interface 52 and the seventeenth interface 101. The twentieth interface 112 is respectively connected to the ninth interface 61, the thirteenth interface 83 and the sixteenth interface 92.

[0191] In implementation, the nineteenth interface 111 can be connected to the eighth interface 52 and the seventeenth interface 101 through pipelines, and the twentieth interface 112 can be connected to the ninth interface 61, the thirteenth interface 83, and the sixteenth interface 92 through pipelines. The inner diameters of the above pipelines can be the same or different, and the embodiment of the present disclosure does not limit the inner diameter of the pipeline.

[0192] The heat storage system may also include a controller, which may be electrically connected to the pressure equalizing element 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180, the second throttle valve 130, and the first throttle valve 9, respectively. The controller may provide an electrical control signal input to achieve the purpose of controlling the refrigerant in the heat exchange system and the water in the water circuit.

[0193] In implementation, when a heat storage instruction is received, the controller controls the pressure equalizing element 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180, the second throttle valve 130, the first throttle valve 9, the second control valve 100 and the third control valve 110. The controller controls the pressure equalizing element 5 based on the pressure difference between the refrigerant output by the sixth interface 42 and the fourth interface 32, so as to achieve the purpose of cooling and reducing the pressure of the refrigerant output by the sixth interface 42. The controller controls the first control valve 7 to connect the first air outlet 12 with the fifth interface 41 and the first interface 21 with the tenth interface 62. The controller controls the sixth control valve 170 to close and the seventh control valve 180 to open. The controller controls the second The opening of the throttle valve 130 causes the refrigerant flowing through the second throttle valve 130 to cool down and reduce the pressure. The controller controls the second control valve 100 to open and the third control valve 110 to close based on the difference between the temperature of the heating object of the first heat exchanger 3 and the second heat exchanger 4 and the heating target temperature when the difference is greater than the difference threshold. Based on the first corresponding relationship between the difference and the opening, the second opening corresponding to the difference is determined, and the first throttle valve 9 is controlled based on the second opening. When the difference is less than the difference threshold, the second control valve 100 is closed and the third control valve 110 is opened. Based on the second corresponding relationship between the difference and the opening, the third opening corresponding to the difference is determined, and the first throttle valve 9 is controlled based on the third opening.

[0194] When the controller controls the second control valve 100 to open and the third control valve 110 to close, the flow direction of the refrigerant in the heat exchange circuit is completely consistent with the flow direction of the refrigerant in the heat exchange circuit in the heat storage state in the first structural feature.

[0195] When the controller controls the second control valve 100 to close and the third control valve 110 to open, the flow direction of the refrigerant in the heat exchange circuit is as follows: Figure 8As shown, the heat exchange circuit that outputs the refrigerant from the first air outlet 12 of the compressor 1 is called a high-pressure circuit. The heat exchange circuit that outputs the refrigerant from the second air outlet 13 of the compressor 1 is called a low-pressure circuit, the heat exchange circuit in which the refrigerant finally flows to the second air inlet 14 of the compressor 1 is called a low-pressure branch circuit, and the heat exchange circuit in which the refrigerant finally flows to the first air inlet 11 of the compressor 1 is called a low-pressure main circuit. The flow direction of the refrigerant in the high-pressure circuit is as follows: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the second heat exchanger 4 through the first air outlet 12 and the first control valve 7, and then flows through the pressure equalizing member 5, the third control valve 110, the outdoor heat exchange component 6, the first control valve 7, the gas separator 2 in sequence, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure main circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the third heat exchanger 8, the outdoor heat exchange component 6, the first control valve 7, the gas separator 2 in sequence, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure branch circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the third heat exchanger 8, the first throttle valve 9 in sequence, and finally flows to the second air inlet 14 of the compressor 1 to complete the cycle.

[0196] The flow direction of water in the water channel is completely consistent with the flow direction of water in the above-mentioned water channel in the heat storage state.

[0197] In implementation, when a defrost command is received, the controller controls the pressure equalizing element 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180, the second throttle valve 130, the first throttle valve 9, the second control valve 100 and the third control valve 110. The controller sets the pressure equalizing element 5 to a state where the refrigerant can flow completely through and the refrigerant flowing through the pressure equalizing element 5 does not change at all. The controller controls the first control valve 7 to connect the first air outlet 12 with the tenth interface 62 and the first interface 21 with the fifth interface 41. The controller controls the sixth control valve 170 to open and the seventh control valve 180 to close. The controller controls the opening of the second throttle valve 130, thereby reducing the temperature and pressure of the refrigerant flowing through the second throttle valve 130. The controller controls the second control valve 100 to close and the third control valve 110 to open, determines the difference between the temperature of the heating object of the first heat exchanger 3 and the heating target temperature, determines the fourth opening corresponding to the difference based on the second corresponding relationship, and controls the first throttle valve 9 based on the fourth opening. That is, when the first throttle valve 9 is controlled to be opened, the low-pressure circuit can achieve "air replenishment", and when the first throttle valve 9 is closed, the low-pressure circuit cannot achieve "air replenishment".

[0198] When the first throttle valve 9 is controlled to open, the flow direction of the refrigerant in the heat exchange circuit is as follows: Figure 8As shown, the heat exchange circuit that outputs the refrigerant from the first air outlet 12 of the compressor 1 is called a high-pressure circuit, the heat exchange circuit that outputs the refrigerant from the second air outlet 13 of the compressor 1 is called a low-pressure circuit, the heat exchange circuit in which the refrigerant finally flows to the second air inlet 14 of the compressor 1 is called a low-pressure branch circuit, and the heat exchange circuit in which the refrigerant finally flows to the first air inlet 11 of the compressor 1 is called a low-pressure main circuit. The flow direction of the refrigerant in the high-pressure circuit is as follows: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the outdoor heat exchange component 6 through the first air outlet 12 and the first control valve 7, and then flows through the third control valve 110, the pressure equalizing member 5, the second heat exchanger 4, the first control valve 7, and the gas separator 2 in sequence, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure main circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the third heat exchanger 8, the third control valve 110, the pressure equalizing member 5, the second heat exchanger 4, the first control valve 7, the gas separator 2, and finally flows to the first air inlet 11 of the compressor 1 to complete the cycle. The flow direction of the refrigerant in the low-pressure branch circuit is: the compressor 1 compresses the low-pressure refrigerant, and the high-pressure refrigerant flows to the first heat exchanger 3 through the second air outlet 13, and then flows through the third heat exchanger 8, the first throttle valve 9, and finally flows to the second air inlet 14 of the compressor 1 to complete the cycle.

[0199] When the first throttle valve 9 is controlled to be closed, the third heat exchanger 8 is equivalent to a pipeline, and the flow direction of the refrigerant in the heat exchange circuit is completely consistent with the flow direction of the refrigerant in the defrosting state of the above-mentioned structural feature one.

[0200] The flow direction of water in the water channel is completely consistent with the flow direction of water in the above-mentioned water channel in the defrosting state.

[0201] Alternatively, if Fig. 9 As shown, an eighth control valve 190 can be added to the water circuit, and the flow direction of water in the water circuit with the eighth control valve 190 added is completely consistent with the flow direction of water in the water circuit with the eighth control valve 190 added as described above.

[0202] Compared with the original heat storage system and the heat storage system with structural feature one, the heat storage system with structural feature two can choose whether to add an "air supply" branch of the high-pressure circuit during heat storage, and can choose whether to add an "air supply" branch of the low-pressure circuit during defrosting, thereby improving the efficiency of compressor 1.

[0203] Alternatively, if Fig.10 As shown, adding a fourth control valve 200 and a fifth control valve 210 in the heat storage system can also achieve the effect of the second structural feature.

[0204] In the heat storage state, the controller's control over the pressure equalizing element 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180, the second throttle valve 130, the first throttle valve 9, the second control valve 100 and the third control valve 110 is consistent with the control of the above-mentioned structural feature two. The controller controls the fourth control valve 200 and the fifth control valve 210 to be opened, so that refrigerant passes through the high-pressure circuit and the low-pressure circuit at the same time.

[0205] In addition, in this structural feature, it can be selected that only the high-pressure circuit has refrigerant passing through, and the corresponding controller can control: control the second control valve 100 to be closed, control the third control valve 110 to be opened, control the fourth control valve 200 to be closed, and the fifth control valve 210 to be closed. In this structural feature, it can also be selected that only the low-pressure circuit has refrigerant passing through, and the corresponding controller can control: control the second control valve 100 and the third control valve 110 to be opened, and control the fourth control valve 200 and the fifth control valve 210 to be closed.

[0206] In the defrosting state, the controller controls the pressure equalizing member 5, the first control valve 7, the sixth control valve 170, the seventh control valve 180, the second throttle valve 130, the first throttle valve 9, the second control valve 100 and the third control valve 110 in accordance with the control of the above-mentioned structural feature 2. The controller controls whether the low-pressure circuit has an "air supply" branch by controlling the fourth control valve 200 and the fifth control valve 210. When the fourth control valve 200 is closed and the fifth control valve 210 is closed, the low-pressure circuit has no "air supply" branch. When the fourth control valve 200 is opened and the fifth control valve 210 is opened, the low-pressure circuit has an "air supply" branch.

[0207] The technical solution provided by the embodiments of the present disclosure includes at least the following beneficial effects:

[0208] The heat exchange circuit includes a first heat exchanger and a second heat exchanger. In the heat storage state (i.e., the first state of the first control valve), the first heat exchanger and the second heat exchanger can both be used for heating. In the defrosting state (i.e., the second state of the first control valve), the first heat exchanger can still be used for heating. In this way, in the defrosting state, the heat exchange circuit can both defrost and continue to heat, thereby improving the heating efficiency of the heat exchange circuit.

[0209] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A heat exchange circuit, characterized in that: The heat exchange circuit comprises a compressor (1), a gas separator (2), a first heat exchanger (3), a second heat exchanger (4), a pressure equalizing element (5), an outdoor heat exchange component (6) and a first control valve (7); The compressor (1) has a first air inlet (11), a first air outlet (12) and a second air outlet (13), and the air pressure at the first air outlet (12) is greater than that at the second air outlet (13); The gas separator (2) has a first interface (21) and a second interface (22), and the second interface (22) is connected to the first gas inlet (11); The first heat exchanger (3) has a third interface (31) and a fourth interface (32), and the third interface (31) is connected to the second air outlet (13); The second heat exchanger (4) has a fifth interface (41) and a sixth interface (42); The pressure equalizing element (5) has a seventh interface (51) and an eighth interface (52), the seventh interface (51) is connected to the sixth interface (42), and the pressure equalizing element (5) is used to reduce the pressure difference between the refrigerant output from the sixth interface (42) and the fourth interface (32); The outdoor heat exchange component (6) has a ninth interface (61) and a tenth interface (62), and the ninth interface (61) is connected to the fourth interface (32) and the eighth interface (52) respectively; The first control valve (7) is respectively connected to the first air outlet (12), the first interface (21), the fifth interface (41), and the tenth interface (62); the first control valve (7) is used to connect the first air outlet (12) with the fifth interface (41) and the first interface (21) with the tenth interface (62) in a first state, and to connect the first air outlet (12) with the tenth interface (62) and the first interface (21) with the fifth interface (41) in a second state.

2. The heat exchange circuit according to claim 1, characterized in that: The heat exchange circuit further comprises a third heat exchanger (8) and a first throttle valve (9), and the compressor (1) has a second air inlet (14); The third heat exchanger (8) has an eleventh interface (81), a twelfth interface (82), a thirteenth interface (83) and a fourteenth interface (84); inside the third heat exchanger (8), the eleventh interface (81) is connected to the thirteenth interface (83), the twelfth interface (82) is connected to the fourteenth interface (84), the eleventh interface (81) is respectively connected to the fourth interface (32) and the eighth interface (52), and the twelfth interface (82) is connected to the second air inlet (14); The first throttle valve (9) has a fifteenth interface (91) and a sixteenth interface (92); the fifteenth interface (91) is connected to the fourteenth interface (84); the sixteenth interface (92) is respectively connected to the ninth interface (61) and the thirteenth interface (83).

3. The heat exchange circuit according to claim 2, characterized in that: The heat exchange circuit further comprises a second control valve (100) and a third control valve (110); The second control valve (100) has a seventeenth interface (101) and an eighteenth interface (102), and the eighteenth interface (102) is respectively connected to the fourth interface (32) and the eleventh interface (81); The third control valve (110) has a nineteenth interface (111) and a twentieth interface (112); the nineteenth interface (111) is respectively connected to the eighth interface (52) and the seventeenth interface (101); the twentieth interface (112) is respectively connected to the ninth interface (61), the thirteenth interface (83), and the sixteenth interface (92).

4. The heat exchange circuit according to claim 3, characterized in that: The heat exchange circuit further includes a fourth control valve (200) and a fifth control valve (210); The fourth control valve (200) has a twenty-first interface (201) and a twenty-second interface (202), the twenty-first interface (201) being connected to the fourth interface (32) and the eighteenth interface (102) respectively, and the twenty-second interface (202) being connected to the eleventh interface (81); The fifth control valve (210) has a twenty-third interface (211) and a twenty-fourth interface (212); the twenty-third interface (211) is respectively connected to the thirteenth interface (83) and the sixteenth interface (92); the twenty-fourth interface (212) is respectively connected to the ninth interface (61) and the twentieth interface (112).

5. The heat exchange circuit according to claim 4, characterized in that: The heat exchange circuit also includes a controller (01); The controller (01) is electrically connected to the first throttle valve (9), the first control valve (7), the second control valve (100), the third control valve (110), the fourth control valve (200), and the fifth control valve (210), respectively.

6. The heat exchange circuit according to claim 1, characterized in that: The pressure equalizing element (5) is a throttle valve, and the throttle valve is used to reduce the pressure of the refrigerant output from the sixth interface (42) by a specified value.

7. The heat exchange circuit according to claim 1, characterized in that: The first control valve (7) is a four-way valve.

8. The heat exchange circuit according to claim 1, characterized in that: The outdoor heat exchange component (6) comprises an outdoor heat exchanger (120) and a second throttle valve (130), one interface of the outdoor heat exchanger (120) is connected to one interface of the second throttle valve (130), another interface of the outdoor heat exchanger (120) is the tenth interface (62), and another interface of the second throttle valve (130) is the ninth interface (61).

9. A heat storage system, characterized in that: The heat storage system comprises a first water tank (150), a second water tank (160), a sixth control valve (170), a seventh control valve (180), and a heat exchange circuit according to any one of claims 1 to 8; The first heat exchanger (3) included in the heat exchange circuit also has a first water inlet (33) and a first water outlet (34); the second heat exchanger (4) included in the heat exchange circuit also has a second water inlet (43) and a second water outlet (44); the first water tank (150) has a twenty-fifth interface (151) and a twenty-sixth interface (152); the second water tank (160) has a twenty-seventh interface (161) and a twenty-eighth interface (162); the sixth control valve (170) has a twenty-ninth interface (171) and a thirtieth interface (172); and the seventh control valve (180) has a thirty-first interface (181) and a thirty-second interface (182); The thirty-first interface (181) is respectively connected to the water source and the first water inlet (33); the thirty-second interface (182) is respectively connected to the thirtieth interface (172) and the second water inlet (43); the twenty-ninth interface (171) is connected to the twenty-sixth interface (152); the first water outlet (34) is connected to the twenty-seventh interface (161); and the second water outlet (44) is connected to the twenty-fifth interface (151).

10. The thermal storage system according to claim 9, characterized in that: The thermal storage system further comprises an eighth control valve (190); The eighth control valve (190) has a thirty-third interface (191) and a thirty-fourth interface (192); the thirty-third interface (191) is respectively connected to the first water outlet (34) and the twenty-seventh interface (161); the thirty-fourth interface (192) is respectively connected to the thirtieth interface (172), the second water inlet (43) and the thirty-second interface (182).

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