Heat exchange circuit and heat storage system

Abstract

The present disclosure relates to a heat exchange circuit and a heat storage system, belonging to the technical field of heat exchange equipment. The heat exchange circuit includes a compressor, a gas separator, a first heat exchanger, a second heat exchanger, a pressure equalizing member, an outdoor heat exchange assembly, and a first control valve. The heat storage system includes a first water tank, a second water tank, a sixth control valve, a seventh control valve, and the above-mentioned heat exchange circuit. By adopting the present disclosure, in the defrosting state, the heat exchange circuit can not only defrost but also continuously heat, thereby improving the heating efficiency of the heat storage system.

Description

Technical Field

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

[0002] With the increasing emphasis on energy conservation, heat storage systems have emerged. A heat storage system includes a heat exchange circuit and a water circuit. When the heat storage system is heating, it uses the heat of the refrigerant in the heat exchange circuit to heat the water in the water circuit for domestic water or heating. In winter, since the outdoor temperature is below 0°C, when the heat storage system is heating, the outdoor heat exchanger in the heat exchange circuit is prone to frosting, which affects the heating efficiency of the heat storage system. Therefore, defrosting of the outdoor heat exchanger is required.

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

[0004] Adopting this traditional defrosting mode, the heat storage system will stop heating during defrosting, which affects the heating efficiency of the heat storage system. Summary of the Invention

[0005] 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 art. The technical solutions are as follows:

[0006] Embodiments of the present disclosure provide a heat exchange circuit, which includes a compressor, a gas separator, a first heat exchanger, a second heat exchanger, a pressure equalizing member, an outdoor heat exchange assembly, and a first control valve;

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

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

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

[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, and the seventh interface is connected to the sixth interface. The pressure equalizing member is used to reduce the pressure difference between the refrigerant output at the sixth interface and the fourth interface;

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

[0013] The first control valve is respectively connected to the first air outlet, the first interface, the fifth interface, and the tenth interface. The first control valve is configured to connect the first air outlet to the fifth interface and the first interface to the tenth interface in the first state, and connect the first air outlet to the tenth interface and the first interface to 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. 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, and 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 for:

[0018] When receiving a heat storage instruction, switch the first control valve to the first state. When the first control valve is in the first state, determine the difference between the temperature of the heating object of the first heat exchanger and the second heat exchanger and the heating target temperature, determine a first opening degree based on the difference, and control the first throttle valve based on the first opening degree.

[0019] When receiving a defrosting instruction, switch the first control valve to the second state. When the first throttle valve is in the second state, control the first throttle valve to close.

[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. The eighteenth interface is respectively connected to the fourth interface and the eleventh interface.

[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 for:

[0024] When a heat storage instruction is received, switch the first control valve to the first state. When the first control valve is in the first state, determine 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 difference is greater than the difference threshold, control the second control valve to open and the third control valve to close. Based on the first correspondence between the difference and the opening degree, determine the second opening degree corresponding to the difference, and control the first throttle valve based on the second opening degree. When the difference is less than the difference threshold, control the second control valve to close and the third control valve to open. Based on the second correspondence between the difference and the opening degree, determine the third opening degree corresponding to the difference, and control the first throttle valve based on the third opening degree;

[0025] When a defrosting instruction is received, switch the first control valve to the second state, control the second control valve to close, control the third control valve to open, determine the difference between the temperature of the heating object of the first heat exchanger and the heating target temperature, based on the second correspondence, determine the fourth opening degree corresponding to the difference, and control the first throttle valve based on the fourth opening degree.

[0026] In a possible implementation manner, 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 respectively communicated with the fourth interface and the eighteenth interface, and the twenty-second interface is communicated with the eleventh interface;

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

[0029] In a possible implementation manner, 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 manner, the pressure equalizing member is a throttle valve. The throttle valve 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 a possible implementation manner, the outdoor heat exchange assembly includes an outdoor heat exchanger and a second throttle valve. One interface of the outdoor heat exchanger is communicated with one 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] An embodiment of the present disclosure provides a heat storage system, which includes a first water tank, a second water tank, a sixth control valve, a seventh control valve, and the heat exchange circuit as described above.

[0034] The first heat exchanger included in the heat exchange circuit further has a first water inlet and a first water outlet. The second heat exchanger included in the heat exchange circuit further 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. The seventh control valve has a thirty-first interface and a thirty-second interface.

[0035] The thirty-first interface is respectively communicated with a water source and the first water inlet. The thirty-second interface is respectively communicated with the thirtieth interface and the second water inlet. The twenty-ninth interface is communicated with the twenty-sixth interface. The first water outlet is communicated with the twenty-seventh interface. The second water outlet is communicated with the twenty-fifth interface.

[0036] In a possible implementation manner, 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 communicated with the first water outlet and the twenty-seventh interface. The thirty-fourth interface is respectively communicated with the thirtieth interface, the second water inlet, and the thirty-second interface.

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

[0039] There are a first heat exchanger and a second heat exchanger in the heat exchange circuit. In the heat storage state (i.e., the first state of the first control valve), both the first heat exchanger and the second heat exchanger can 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 not only defrost but also continuously heat, thereby improving the heating efficiency of the heat exchange circuit.

[0040] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit 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 following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

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

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

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

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

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

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

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

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

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

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

[0052] Legend description:

[0053] 1. Compressor;

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

[0055] 2. Gas separator;

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

[0057] 3. 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. Equalizing part;

[0062] 51. Seventh interface; 52. Eighth interface;

[0063] 6. Outdoor heat exchange module;

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

[0065] 7. First control valve;

[0066] 8. Third heat exchanger;

[0067] 81. Eleventh interface; 82. Twelfth interface; 83. Thirteenth interface; 84. Fourteenth interface;

[0068] 9. First throttle valve;

[0069] 91. Fifteenth interface; 92. Sixteenth interface;

[0070] 100. Second control valve;

[0071] 101. Seventeenth interface; 102. Eighteenth interface;

[0072] 110. 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. Twenty-fifth interface; 152. Twenty-sixth interface;

[0078] 160. Second water tank;

[0079] 161. Twenty-seventh interface; 162. Twenty-eighth interface;

[0080] 170. Sixth control valve;

[0081] 171. Twenty-ninth interface; 172. Thirtieth interface;

[0082] 180. Seventh control valve;

[0083] 181. Thirty-first interface; 182. Thirty-second interface;

[0084] 190. Eighth control valve;

[0085] 191. Thirty-third interface; 192. Thirty-fourth interface;

[0086] 200, Fourth control valve;

[0087] 201, Twenty - first interface; 202, Twenty - second interface;

[0088] 210, Fifth control valve;

[0089] 211, Twenty - third interface; 212, Twenty - fourth interface. Detailed implementation manners

[0090] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0091] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", "third", and similar terms used in the patent disclosure specification and claims of the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not denote a quantity limitation, but indicate the existence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships 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, thereby achieving the purpose of cooling or heating the target object. In winter, when the heat storage system heats the target object, since the outdoor temperature is lower than 0°C, the outdoor heat exchanger is prone to frosting, thus affecting the heating efficiency of the air - source heat pump system. Therefore, it is necessary to defrost the outdoor heat exchanger. When the air - source heat pump system defrosts, it will stop heating the target object. At this time, the heating efficiency of the air - source heat pump system is zero, affecting the comfort of users.

[0093] The embodiments of the present disclosure provide a heat storage system, which includes a heat exchange circuit and a water circuit, as 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 component 5, an outdoor heat exchange assembly 6, and a first control valve 7. 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 component 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 assembly 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. 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 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. The other 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. 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 a 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. 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 flowing through the first heat exchanger 3 and the second heat exchanger 4 can be used to heat water. The compressor 1 can provide refrigerants with two 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. 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 quickly defrost or the energy storage in the first water tank 150 is insufficient, a 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 is an introduction to each component of the heat storage system respectively:

[0099] I. Compressor 1

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

[0101] As Figure 4 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 and the second interface 22 of the gas separator 2 can be connected through a pipeline, the first air outlet 12 and the first control valve 7 can be connected through a pipeline, and the second air outlet 13 and the third interface 31 of the first heat exchanger 3 can be connected through a pipeline. The inner diameters of the above pipelines can be the same or different, and the present disclosure embodiment does not limit the inner diameters of the pipelines.

[0103] The compressor 1 includes a cylinder block and a piston. A piston cavity (both not shown) is provided in the cylinder block. The piston is slidably connected to the piston cavity. When the piston moves, the low-temperature and low-pressure refrigerant entering the piston cavity is compressed, and the temperature of the compressed refrigerant rises. During the process of the compressor 1 compressing the refrigerant, the energy is converted from electrical energy to the mechanical energy of the piston and then to the internal energy of the refrigerant.

[0104] The compressor 1 can be a dual-exhaust compressor, and the dual-exhaust compressor can provide refrigerants with two different temperatures and pressures.

[0105] Optionally, the compressor 1 can be a scroll compressor. The scroll compressor has the characteristics of a relatively small axial dimension and low noise. Compared with a piston compressor, choosing a scroll compressor can reduce the size of the outdoor unit after integrating the compressor 1, and at the same time can reduce the operating noise of the outdoor unit when the indoor air temperature regulation system is working.

[0106] Optionally, two single-exhaust compressors can be used instead of the dual-exhaust compressor, and the pressures and temperatures of the compressed refrigerants provided by the two single-exhaust compressors should be different.

[0107] II. Gas separator 2

[0108] The gas separator 2 is a component for separating the gaseous refrigerant in the heat storage system.

[0109] As Figure 4 shown, the gas separator 2 has a first interface 21 and a second interface 22. The first interface 21 is communicated with the first control valve 7, and the second interface 22 is communicated with the first intake port 11 of the compressor 1. The gas-liquid mixed refrigerant flowing through the gas separator 2 can separate the gaseous refrigerant and then transport the gaseous refrigerant to the compressor 1.

[0110] In implementation, the first interface 21 and the first control valve 7 can be communicated through a pipeline, and the second interface 22 and the first intake port 11 can be communicated through a pipeline. The inner diameters of the above pipelines can be the same or different, and the present disclosure embodiment does not limit the inner diameters of the pipelines.

[0111] III. 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 the fluid with a higher temperature to the fluid with a lower temperature.

[0113] As Figure 4 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 communicated with the second outlet port 13 of the compressor 1, the fourth interface 32 is respectively communicated with the eighth interface 52 of the pressure equalizing member 5 and the ninth interface 61 of the outdoor heat exchange assembly 6, the first water inlet 33 is respectively communicated with a water source and the thirty-first interface 181 of the seventh control valve 180, and the first water outlet 34 is communicated with the twenty-seventh interface 161 of the second water tank 160.

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

[0115] In one example, the first heat exchanger 3 can be a plate heat exchanger. A plate heat exchanger is a new type of high-efficiency heat exchanger composed of stacked corrugated metal sheets. Thin rectangular channels are formed between various plates, and heat exchange is carried out through the plates.

[0116] IV. The 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] As Figure 4 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 separation unit 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 thirtieth interface 172 of the sixth control valve 170 and the thirty-second interface 182 of the seventh control valve 180. The second water outlet 44 is connected to the twenty-fifth 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 respectively 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 respectively through a pipeline. The second water outlet 44 can be connected to the twenty-fifth interface 151 through a pipeline. The inner diameters of the above pipelines can be the same or different, and the embodiments of the present disclosure do not limit the inner diameters of the pipelines.

[0120] In one example, the second heat exchanger 4 can be a plate heat exchanger. A plate heat exchanger is a new type of high-efficiency heat exchanger composed of stacked corrugated metal sheets. Thin rectangular channels are formed between various plates, and heat exchange is carried out through the plates.

[0121] V. The pressure equalizing member 5

[0122] The pressure equalizing member 5 is a component that adjusts the pressure of the refrigerant in this branch.

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

[0124] In implementation, the seventh interface 51 and the sixth interface 42 can be in communication through a pipeline, and the eighth interface 52 and the ninth interface 61, the fourth interface 32 can be in communication through pipelines respectively. The inner diameters of the above pipelines can be the same or different, and the embodiments of the present disclosure do not limit the inner diameters of the pipelines.

[0125] In one example, the pressure equalizing member can be a throttle valve. The throttle valve can control the flow rate of the fluid flowing through the throttle valve by adjusting the opening degree, so as to achieve the purpose of controlling the fluid pressure.

[0126] The throttle valve can be a needle-shaped throttle valve, a groove-shaped throttle valve, or a window-type throttle valve. The embodiments of the present disclosure do not limit the type of the throttle valve.

[0127] VI. Outdoor heat exchange assembly 6

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

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

[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 in communication with 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 kind of heat exchanger, which can transfer heat from the high-temperature fluid flowing through the outdoor heat exchanger 120 to the low-temperature fluid flowing through the outdoor heat exchanger 120.

[0132] In one example, when the heat 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, since the outdoor temperature is very low, the pipes in the outdoor heat exchanger 120 that are in contact with the air will frost, thus affecting the heating efficiency of the heat storage system.

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

[0134] The throttle valve can be a needle-shaped throttle valve, a groove-shaped throttle valve, or a window-type throttle valve. The embodiments of the present disclosure do not limit the type of the throttle valve.

[0135] VII. The 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 embodiments of the present disclosure, the first control valve 7 is mainly used to adjust the direction of the fluid.

[0137] Such as Figure 4 As shown, the first control valve 7 is respectively connected to the first 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 assembly 6.

[0138] In implementation, the first control valve 7 can be connected to the first outlet 12, the first interface 21, the fifth interface 41, and the tenth interface 62 through pipes. The inner diameters of the above pipes can be the same or different. The embodiments of the present disclosure do not limit the inner diameters of the pipes.

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

[0140] VIII. The first water tank 150

[0141] The first water tank 150 is a component used to store water.

[0142] Such as 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 implementation, the twenty-fifth interface 151 can be connected to the second water outlet 44 through a pipe, and the twenty-sixth interface 152 can be connected to the twenty-ninth interface 171 through a pipe. The inner diameters of the above pipes can be the same or different. The embodiments of the present disclosure do not limit the inner diameters of the pipes.

[0144] In one example, the first water tank 150 is a heat-insulated water tank. A heat-insulated water tank refers to a component that adds special industrial and heat-insulating materials to the interlayer of the water tank to keep the water in the water tank at a certain temperature. The heat-insulated water tank can be a stainless-steel heat-insulated water tank, a pressure-bearing heat-insulated water tank, a fiberglass-reinforced plastic heat-insulated water tank, etc.

[0145] IX. Second water tank 160

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

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

[0148] In implementation, the twenty-seventh interface 161 and the first water outlet 34 can be communicated through a pipeline. The inner diameters of the above pipelines can be the same or different, and the embodiments of the present disclosure do not limit the inner diameters of the pipelines.

[0149] In one example, the second water tank 160 is a heat-insulated water tank. A heat-insulated water tank refers to a component that adds special industrial and heat-insulating materials to the interlayer of the water tank to keep the water in the water tank at a certain temperature. The heat-insulated water tank can be a stainless-steel heat-insulated water tank, a pressure-bearing heat-insulated water tank, a fiberglass-reinforced plastic heat-insulated water tank, etc.

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

[0151] X. 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 embodiments of the present disclosure, the sixth control valve 170 is mainly used to control the on / off of the fluid.

[0153] As Figure 4 shown, the sixth control valve 170 has a twenty-ninth interface 171 and a thirtieth interface 172. The twenty-ninth interface 171 is communicated with the twenty-sixth interface 152 of the first water tank 150, and the thirtieth interface 172 is respectively communicated with 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 and the twenty-sixth interface 152 can be communicated through a pipeline, and the thirtieth interface 172 and the thirty-second interface 182, the second water inlet 43 can be communicated through pipelines respectively. The inner diameters of the above pipelines can be the same or different, and the embodiments of the present disclosure do not limit the inner diameters of the pipelines.

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

[0156] XI. The 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 embodiments of the present disclosure, the seventh control valve 180 is mainly used to control the on-off of the fluid.

[0158] As Figure 4 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 and the water source, the first water inlet 33 can be connected through a pipeline, and the thirty-second interface 182 and the thirtieth interface 172, the second water inlet 43 can be connected through a pipeline. The inner diameters of the above pipelines can be the same or different, and the embodiments of the present disclosure do not limit the inner diameters of the pipelines.

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

[0161] The heat storage system may further include a controller, and the controller can be electrically connected to the pressure equalizing member 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 can input an electric control signal to control the refrigerant in the heat exchange system and the water in the water circuit.

[0162] In implementation, when receiving a heat storage instruction, the controller controls the pressure equalizing member 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 member 5 based on the pressure difference between the sixth interface 42 and the fourth interface 32 to output the refrigerant, so as to cool down and reduce 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 connect 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 degree of the second throttle valve 130, so that the refrigerant flowing through the second throttle valve 130 cools down and reduces the pressure.

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

[0164] The flow direction of the water in the water circuit is as follows: As Figure 4 shown, the 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. 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 long enough time, theoretically, the temperature of the water in the first water tank 150 can be higher than the temperature of the water in the second water tank 160.

[0165] In implementation, when a defrosting instruction is received, the controller controls the pressure equalizing part 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 part 5 to a state where the refrigerant can flow through completely and the refrigerant flowing through the pressure equalizing part 5 does not change at all. The controller controls the first control valve 7 to connect the first outlet 12 with the tenth interface 62 and connect 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, and the controller controls the opening degree of the second throttle valve 130, so as to cool down and reduce the 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: As Figure 4As shown in the figure, the heat exchange circuit that outputs refrigerant from the first outlet 12 of the compressor 1 is called the high-pressure circuit, and the heat exchange circuit that outputs refrigerant from the second outlet 13 of the compressor 1 is called the 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 through the first outlet 12 and the first control valve 7 to the outdoor heat exchange component 6, then successively passes through the pressure equalizing component 5, the second heat exchanger 4, the first control valve 7, and the gas separator 2, and finally flows to the first 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 through the second outlet 13 to the first heat exchanger 3, then successively passes through the pressure equalizing component 5, the second heat exchanger 4, the first control valve 7, and the gas separator 2, and finally flows to the first inlet 11 of the compressor 1 to complete the cycle.

[0167] The flow direction of the water in the water circuit is as follows: As Figure 4 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. The flow direction of another water circuit for providing heat is to flow out from the twenty-sixth interface 152 of the first water tank 150, pass through the sixth control valve 170, and flow to the second heat exchanger 4. The water in the water circuit can flow back to the first water tank 150 after providing heat in the second heat exchanger 4, or the flow direction of the water in this water circuit can be set to flow to other places according to actual needs.

[0168] Optionally, as Figure 5 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 communicated with the first water outlet 34 and the twenty-seventh interface 161, and the thirty-fourth interface 192 is respectively communicated with 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 close, and the flow direction of the water in the water circuit is exactly the same as that of the water in the heat storage system without adding 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 from the first water outlet 34 can also flow to the second water inlet 43, so as to provide heat for the second heat exchanger 4.

[0169] Next, some optional structural features of the heat storage system will be introduced:

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

[0171] The third heat exchanger 8 is a component that enables heat transfer between two or more fluids at different temperatures, allowing heat to be transferred from the fluid at a higher temperature to the fluid at a lower temperature. The functions of the first throttle valve 9 and the second throttle valve 130 are similar, and reference can be made to the description of the functions of the second throttle valve 130. As Figure 6 shown, when the third heat exchanger 8 is used in conjunction with the second throttle valve 130, 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 the open state, the refrigerant flowing out from the thirteenth interface 83 passes through the first throttle valve 9, thereby reducing the temperature and pressure, and then flows back into the third heat exchanger 8. After passing through the third heat exchanger 8, the refrigerant absorbs heat and is completely converted into a gas phase, thereby achieving the purpose of "supplementing gas" for the compressor 1 and increasing the efficiency of the compressor 1.

[0172] As Figure 6 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 to the thirteenth interface 83, and 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.

[0173] In practice, the eleventh interface 81 and the fourth interface 32, and the eighth interface 52 can be connected through pipelines. The twelfth interface 82 and the second air inlet 14 can be connected through pipelines. The inner diameters of the above pipelines can be the same or different, and the embodiments of the present disclosure do not limit the inner diameters of the pipelines.

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

[0175] 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, and the sixteenth interface 92 is respectively connected to the ninth interface 61 and the thirteenth interface 83.

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

[0177] The heat storage system can also include a controller, which can be electrically connected to 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 respectively. The controller can control the refrigerant in the heat exchange system and the water in the water circuit by providing an electric control signal input.

[0178] In implementation, when a heat storage instruction is received, 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 controls the pressure equalizing member 5 based on the pressure difference of the refrigerant output from the sixth interface 42 and the fourth interface 32, so as to achieve the purpose of cooling and depressurizing 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 connect 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 degree of the second throttle valve 130, so that the refrigerant flowing through the second throttle valve 130 is cooled and depressurized. The controller determines the first opening degree 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 first heat exchanger 3 and the second heat exchanger 4 heat different targets respectively, the controller determines the first opening degree 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 degree based on the average value of the two differences. The larger the sum of the two differences or the average value of the two differences is, the larger the first opening degree determined by the controller is.

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

[0180] The flow direction of the water in the water circuit is completely the same as that of the water in the above water circuit in the heat storage state.

[0181] In implementation, when a defrosting 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 sets the pressure equalizing component 5 to a state where the refrigerant can completely flow 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 outlet 12 to the tenth interface 62 and connect the first interface 21 to 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 degree of the second throttle valve 130, thereby causing the refrigerant flowing through the second throttle valve 130 to cool down and reduce pressure. 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: As Figure 6As shown in the figure, the heat exchange circuit that outputs the refrigerant from the first outlet 12 of the compressor 1 is called the high-pressure circuit, and the heat exchange circuit that outputs the refrigerant from the second outlet 13 of the compressor 1 is called the 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 through the first outlet 12 and the first control valve 7 to the outdoor heat exchange component 6, and then flows through the third heat exchanger 8, 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 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 through the second outlet 13 to the first heat exchanger 3, 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 inlet 11 of the compressor 1 to complete the cycle.

[0183] The flow direction of the water in the water circuit is exactly the same as the flow direction of the water in the above water circuit in the defrosting state.

[0184] Optionally, as Figure 7 shown, an eighth control valve 190 can be added to the water circuit, and the flow direction of the water in the water circuit with the eighth control valve 190 added is exactly the same as the flow direction of the water in the above water circuit with the eighth control valve 190 added.

[0185] Compared with the original heat storage system, the heat storage system with structural feature one 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: On the basis of structural feature one, the heat storage system further includes a second control valve 100 and a third control valve 110.

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

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

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

[0190] The third control valve 110 has a nineteenth interface 111 and a twentieth interface 112. The nineteenth interface 111 is respectively communicated with the eighth interface 52 and the seventeenth interface 101, and the twentieth interface 112 is respectively communicated with 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 pipes respectively, and the twentieth interface 112 can be connected to the ninth interface 61, the thirteenth interface 83, and the sixteenth interface 92 through pipes respectively. The inner diameters of the above pipes can be the same or different, and the embodiments of the present disclosure do not limit the inner diameters of the pipes.

[0192] The heat storage system may further include a controller, and the controller can be electrically connected to 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 respectively. The controller can achieve the purpose of controlling the refrigerant in the heat exchange system and the water in the water circuit by providing an electric control signal input.

[0193] In implementation, when a heat storage instruction is received, 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. The controller controls the pressure equalizing member 5 based on the pressure difference of the refrigerant output from 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 from the sixth interface 42. The controller controls the first control valve 7 to connect the first air outlet 12 to the fifth interface 41 and the first interface 21 to 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 degree of the second throttle valve 130, so that the refrigerant flowing through the second throttle valve 130 is cooled and the pressure is reduced. 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, the controller controls the second control valve 100 to open and the third control valve 110 to close. Based on the first correspondence relationship between the difference and the opening degree, the second opening degree corresponding to the difference is determined, and the first throttle valve 9 is controlled based on the second opening degree. When the difference is less than the difference threshold, the controller controls the second control valve 100 to close and the third control valve 110 to open. Based on the second correspondence relationship between the difference and the opening degree, the third opening degree corresponding to the difference is determined, and the first throttle valve 9 is controlled based on the third opening degree.

[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 exactly the same as that of the refrigerant in the heat exchange circuit in the heat storage state in Structural Feature One.

[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: As Figure 8As shown in the figure, the heat exchange circuit that outputs refrigerant from the first outlet 12 of the compressor 1 is called the high-pressure circuit. The heat exchange circuit that outputs refrigerant from the second outlet 13 of the compressor 1 is called the low-pressure circuit. The heat exchange circuit where the refrigerant finally flows to the second intake port 14 of the compressor 1 is called the low-pressure branch circuit. The heat exchange circuit where the refrigerant finally flows to the first intake port 11 of the compressor 1 is called the 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. The high-pressure refrigerant flows through the first outlet 12 and the first control valve 7 to the second heat exchanger 4, then successively passes through the pressure equalizing component 5, the third control valve 110, the outdoor heat exchange assembly 6, the first control valve 7, and the gas separator 2, and finally flows to the first intake port 11 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. The high-pressure refrigerant flows through the second outlet 13 to the first heat exchanger 3, then successively passes through the third heat exchanger 8, the outdoor heat exchange assembly 6, the first control valve 7, and the gas separator 2, and finally flows to the first intake port 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. The high-pressure refrigerant flows through the second outlet 13 to the first heat exchanger 3, then successively passes through the third heat exchanger 8 and the first throttle valve 9, and finally flows to the second intake port 14 of the compressor 1 to complete the cycle.

[0196] The flow direction of the water in the water circuit is exactly the same as the flow direction of the water in the above water circuit in the heat storage state.

[0197] In implementation, when a defrosting 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, the first throttle valve 9, the second control valve 100, and the third control valve 110. The controller sets the pressure equalizing component 5 to a state where the refrigerant can completely flow 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 outlet 12 to the tenth interface 62 and connect the first interface 21 to 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 degree 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 corresponding fourth opening degree based on the second corresponding relationship, and controls the first throttle valve 9 based on the fourth opening degree. That is, when the first throttle valve 9 is controlled to open, the low-pressure circuit can achieve "gas replenishment", and when the first throttle valve 9 is closed, the low-pressure circuit cannot achieve "gas 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: As Figure 8As shown in the figure, the heat exchange circuit that outputs refrigerant from the first outlet 12 of the compressor 1 is called the high-pressure circuit, the heat exchange circuit that outputs refrigerant from the second outlet 13 of the compressor 1 is called the low-pressure circuit, the heat exchange circuit where the refrigerant finally flows to the second inlet 14 of the compressor 1 is called the low-pressure branch circuit, and the heat exchange circuit where the refrigerant finally flows to the first inlet 11 of the compressor 1 is called the 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 through the first outlet 12 and the first control valve 7 to the outdoor heat exchange component 6, and then successively flows through the third control valve 110, the pressure equalizing component 5, the second heat exchanger 4, the first control valve 7, the gas separator 2, and finally flows to the first inlet 11 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 through the second outlet 13 to the first heat exchanger 3, and then successively flows through the third heat exchanger 8, the third control valve 110, the pressure equalizing component 5, the second heat exchanger 4, the first control valve 7, the gas separator 2, and finally flows to the first 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 through the second outlet 13 to the first heat exchanger 3, and then successively flows through the third heat exchanger 8 and the first throttle valve 9, and finally flows to the second 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 the same as the flow direction of the refrigerant in the above structural feature one in the defrosting state.

[0200] The flow direction of the water in the water circuit is completely the same as the flow direction of the water in the above water circuit in the defrosting state.

[0201] Optionally, as Figure 9 shown, an eighth control valve 190 can be added to the water circuit, and the flow direction of the water in the water circuit with the eighth control valve 190 added is completely the same as the flow direction of the water in the above water circuit with the eighth control valve 190 added.

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

[0203] Optionally, as Figure 10 shown, adding a fourth control valve 200 and a fifth control valve 210 to the heat storage system can also achieve the effect of the above structural feature two.

[0204] In the heat storage state, the control of 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 by the controller is the same as the control in the above structural feature 2. The controller controls both the fourth control valve 200 and the fifth control valve 210 to open, so that the refrigerant passes through both 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. The corresponding control of the controller can be: controlling the second control valve 100 to close, controlling the third control valve 110 to open, controlling the fourth control valve 200 to close, and the fifth control valve 210 to close. In this structural feature, it can also be selected that only the low-pressure circuit has refrigerant passing through. The corresponding control of the controller can be: controlling the second control valve 100 and the third control valve 110 to open, and controlling the fourth control valve 200 and the fifth control valve 210 to close.

[0206] In the defrosting state, the control of 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 by the controller is the same as the control in the above structural feature 2. The controller controls whether there is a "gas supplement" branch in the low-pressure circuit 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, there is no "gas supplement" branch in the low-pressure circuit. When the fourth control valve 200 is open and the fifth control valve 210 is open, there is a "gas supplement" branch in the low-pressure circuit.

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

[0208] There are a first heat exchanger and a second heat exchanger in the heat exchange circuit. In the heat storage state (i.e., the first state of the first control valve), both the first heat exchanger and the second heat exchanger can 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 not only defrost but also continuously heat, thereby improving the heating efficiency of the heat exchange circuit.

[0209] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A heat storage system, characterized in that, The heat storage system includes a heat exchange circuit, a first water tank (150), a second water tank (160), a sixth control valve (170), and a seventh control valve (180); 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 member (5), an outdoor heat exchange assembly (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 air 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 member (5) has a seventh interface (51) and an eighth interface (52), and the seventh interface (51) is connected to the sixth interface (42). The pressure equalizing member (5) is used to reduce the pressure difference between the refrigerant outputs of the sixth interface (42) and the fourth interface (32); The outdoor heat exchange assembly (6) has a ninth interface (61) and a tenth interface (62), and the ninth interface (61) is respectively connected to the fourth interface (32) and the eighth interface (52); 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) to the fifth interface (41) and connect the first interface (21) to the tenth interface (62) in the first state, and connect the first air outlet (12) to the tenth interface (62) and connect the first interface (21) to the fifth interface (41) in the second state; where The first heat exchanger (3) further has a first water inlet (33) and a first water outlet (34), the second heat exchanger (4) further 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 a 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).

2. The heat storage system according to claim 1, characterized in that, The heat exchange circuit further includes 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 communicated with the thirteenth interface (83), and the twelfth interface (82) is communicated with the fourteenth interface (84). The eleventh interface (81) is respectively communicated with the fourth interface (32) and the eighth interface (52), and the twelfth interface (82) is communicated with 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 communicated with the fourteenth interface (84), and the sixteenth interface (92) is respectively communicated with the ninth interface (61) and the thirteenth interface (83).

3. The heat storage system according to claim 2, characterized in that, The heat exchange circuit further includes 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). The eighteenth interface (102) is respectively communicated with 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 communicated with the eighth interface (52) and the seventeenth interface (101), and the twentieth interface (112) is respectively communicated with the ninth interface (61), the thirteenth interface (83) and the sixteenth interface (92).

4. The heat storage system 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) is respectively communicated with the fourth interface (32) and the eighteenth interface (102), and the twenty-second interface (202) is communicated with 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 communicated with the thirteenth interface (83) and the sixteenth interface (92), and the twenty-fourth interface (212) is respectively communicated with the ninth interface (61) and the twentieth interface (112).

5. The heat storage system according to claim 4, characterized in that, The heat exchange circuit further includes a controller; The controller 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 storage system according to claim 1, characterized in that The pressure equalizing member (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 storage system according to claim 1, wherein The first control valve (7) is a four-way valve.

8. The heat storage system according to claim 1, characterized in that, 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 communicated with 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. The heat storage system according to claim 1, characterized in that, The heat storage system further includes 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 communicated with a first water outlet (34) and a twenty-seventh interface (161). The thirty-fourth interface (192) is respectively communicated with a thirtieth interface (172), a second water inlet (43), and a thirty-second interface (182).

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