Heat pump system

Abstract

The utility model provides a heat pump system which comprises a first heat storage water tank, a second heat storage water tank, a heat pump loop, an adjusting branch, a control terminal and a control circuit. The heat pump loop comprises a compressor, a first heat exchanger, a first electronic expansion valve, a second heat exchanger, a second electronic expansion valve and a third heat exchanger; the adjusting branch communicates with the compressor and the second heat exchanger and is provided with an adjusting electromagnetic valve. The control terminal is configured to generate set water temperature signals of the first and second heat storage water tanks; the control circuit is configured to receive set water temperature signals and first and second water storage temperature signals of the first and second heat storage water tanks; and a first driving signal is generated to the adjusting electromagnetic valve to keep the adjusting branch closed, so that heat exchange between the refrigerant provided by the compressor and water is performed in the first heat exchanger and the refrigerant is stored in the first heat storage water tank, and heat exchange between the refrigerant passing through the first electromagnetic valve and the water is performed in the second heat exchanger and the refrigerant is stored in the second heat storage water tank. According to the utility model, flexible and wide-range outlet water temperature can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a heat pump system. Background Art

[0002] As the global greenhouse effect becomes increasingly serious, the air conditioning field has higher and higher requirements for the environmental performance of refrigerants. Air source heat pumps (ATW, Air to Water) have attracted much attention. Consumers hope that the outlet water temperature can cover a wider range to meet the needs of different terminals of the heat pump system. For example, the outlet water with a lower water temperature can be used for fan coil cooling, the outlet water with a medium water temperature can be used for floor heating, and the outlet water with a higher water temperature can be used for heating or providing domestic hot water. At present, most air conditioning systems use several refrigerants such as R410A, R32, and R290. Affected by the physical properties of the refrigerant, the maximum outlet water temperature can reach 55°C when using R410A, the maximum outlet water temperature can reach 60°C when using R32, and the maximum outlet water temperature can reach 80°C when using R290. Due to the limitation of the maximum saturation pressure of different refrigerants, if the outlet water temperature is increased further, the system high pressure protection will be triggered.

[0003] If it is desired to further increase the outlet water temperature, electric heating is usually used in the prior art to continue heating. The main disadvantage of electric heating is that it is not energy-saving. Alternatively, a cascade heat recovery system is used, in which the primary system uses R410A or R32 refrigerants with relatively low critical temperatures, and the secondary system uses R134a refrigerants with relatively high critical temperatures. In the Chinese patent application (CN108278751A), an energy-saving air-conditioning system with dual recovery of sensible heat and latent heat is disclosed, wherein under refrigeration conditions, after the refrigerant comes out of the compressor 1, it enters the sensible heat recovery device 8 to heat the hot water, and then flows to the evaporator 9 through the four-way valve 3, and exchanges heat with the heat transfer medium in the latent heat recovery device. After the heat transfer medium absorbs heat and evaporates, it enters the compressor 2 11, and after being compressed by the compressor 11, it becomes a high-temperature and high-pressure heat transfer medium, and transfers heat to the hot water in the condenser 12 to increase its temperature. After the refrigerant flows out of the evaporator 9, it passes through the throttling effect of the throttling device 7, flows to the indoor heat exchanger 4, performs indoor refrigeration, and finally returns to the compressor 1 through the gas-liquid separator 2.

[0004] It is not difficult to see that the above-mentioned reference document uses two compressors (compressor 1 and compressor 11, such as Figure 1 The refrigerant is compressed in two stages (as shown). Using two compressors will significantly increase the complexity and cost of the system. Utility Model Content

[0005] The heat pump system proposed in the utility model aims to provide outlet water covering different temperature ranges under the condition of only one compressor, so as to meet the needs of different terminals of the heat pump system.

[0006] In one or more embodiments of the present application, a heat pump system is provided, including a first hot water storage tank and a second hot water storage tank that are independently arranged; a first hot water storage tank is provided with a first water storage temperature sensor, and the first water storage temperature sensor can detect and generate a first water storage temperature signal; a second hot water storage tank is provided with a second hot water storage temperature sensor, and the second water storage temperature sensor can detect and generate a second water storage temperature signal.

[0007] In one or more embodiments of the present application, the heat pump system further includes a heat pump circuit, which includes a compressor, a first heat exchanger, a first electronic expansion valve, a second heat exchanger, a second electronic expansion valve and a third heat exchanger connected in sequence.

[0008] In one or more embodiments of the present application, the heat pump system further comprises a regulating branch, one end of which is fluidically connected to the compressor, and the other end of which is fluidically connected to the second heat exchanger, and a regulating solenoid valve is disposed on the regulating branch.

[0009] In one or more embodiments of the present application, the heat pump system further includes a control terminal configured to generate a first hot water storage tank set water temperature signal and a second hot water storage tank set water temperature signal.

[0010] In one or more embodiments of the present application, the heat pump system further includes a control circuit configured to receive a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a first drive signal to the regulating solenoid valve to keep the regulating branch closed, so as to perform heat exchange between the refrigerant provided by the compressor and water in the first heat exchanger, and the water after heat exchange is stored in the first hot water storage tank, and perform heat exchange between the refrigerant passing through the first solenoid valve and water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

[0011] In one or more embodiments of the present application, the control circuit is further configured to receive a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a second drive signal to the regulating solenoid valve to keep the regulating branch conductive, so as to perform heat exchange between the refrigerant provided by the compressor and the water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

[0012] In one or more embodiments of the present application, the first heat exchanger is configured to perform heat exchange between the refrigerant provided by the compressor that produces a phase change from gas to liquid and water; or to perform heat exchange between the gas-phase refrigerant provided by the compressor and water.

[0013] In one or more embodiments of the present application, the first heat exchanger comprises: a first refrigerant circulation channel, which is configured to allow refrigerant to flow therein; and a first water circulation channel, which is configured to allow water to flow therein, and the first water circulation channel fluid is connected to the first hot water storage tank; the second heat exchanger comprises: a second refrigerant circulation channel, which is configured to allow refrigerant to flow therein; and a second water circulation channel, which is configured to allow water to flow therein, and the second water circulation channel fluid is connected to the second hot water storage tank; the heat pump system further comprises: a bypass branch, one end of which is fluidly connected to the first refrigerant circulation channel, and the other end of which is fluidly connected to the second refrigerant circulation channel, a bypass solenoid valve is provided on the bypass branch, and the bypass branch is connected in parallel with the first electronic expansion valve.

[0014] In one or more embodiments of the present application, the control circuit is further configured to receive a reference temperature signal, a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a third drive signal to the bypass solenoid valve to keep the bypass branch closed, so as to perform heat exchange between the refrigerant and water that produces a phase change from gas phase to liquid phase provided by the compressor in the first heat exchanger.

[0015] In one or more embodiments of the present application, the control circuit is further configured to receive a reference temperature signal, a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a fourth drive signal to the bypass solenoid valve to keep the bypass branch open, so as to perform heat exchange between the gas-phase refrigerant provided by the compressor and water in the first heat exchanger.

[0016] In one or more embodiments of the present application, an auxiliary heating element is further provided in the first hot water storage tank; the control circuit is further configured to receive a water temperature setting signal of the first hot water storage tank, a water temperature setting signal of the second hot water storage tank, a first water storage temperature signal, and a second water storage temperature signal, and generate a fifth driving signal to the auxiliary heating element to drive the auxiliary heating element to operate.

[0017] The second aspect of the present application provides a heat pump system, comprising: a first hot water storage tank, in which a first water storage temperature sensor is provided, and the first water storage temperature sensor can detect and generate a first water storage temperature signal; a second hot water storage tank, which is independently provided with the first hot water storage tank, in which a second hot water storage temperature sensor is provided, and the second water storage temperature sensor can detect and generate a second water storage temperature signal; a heat pump circuit, which comprises a compressor, a first heat exchanger, a first electronic expansion valve, a second heat exchanger, a second electronic expansion valve and a third heat exchanger connected in sequence; wherein the first heat exchanger has a first water flow channel that is fluidically connected to the first hot water storage tank; the first water A circulation loop, whose fluid is connected to the first water flow channel, and on which a first circulation water pump is arranged; a control terminal, which is configured to generate a first hot water storage tank set water temperature signal and a second hot water storage tank set water temperature signal; and a control circuit, which is configured to receive a reference temperature signal, a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a shutdown drive signal to the first circulation water pump to stop the first circulation water pump, so that the gas-phase refrigerant provided by the compressor passes through the first heat exchanger and exchanges heat with water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

[0018] In one or more embodiments of the present application, the control circuit is further configured to receive a reference temperature signal, a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a working drive signal to the first circulating water pump to keep the first circulating water pump running, so that the first heat exchanger can perform heat exchange between the refrigerant provided by the compressor that produces a phase change from gas phase to liquid phase and water; or can perform heat exchange between the gas phase refrigerant provided by the compressor and water.

[0019] In one or more embodiments of the present application, an auxiliary heating element is further provided in the first hot water storage tank; the control circuit is further configured to receive a water temperature setting signal of the first hot water storage tank, a water temperature setting signal of the second hot water storage tank, a first water storage temperature signal, and a second water storage temperature signal, and generate an auxiliary heating element driving signal to the auxiliary heating element to drive the auxiliary heating element to operate.

[0020] This application can achieve a flexible and wide range of water outlet temperatures through one compressor and two hot water storage tanks.

[0021] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a structural schematic diagram of the prior art;

[0024] Figure 2 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0025] Figure 3 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0026] Figure 4 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0027] Figure 5 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0028] Figure 6 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0029] Figure 7 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0030] Figure 8 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0031] Fig. 9 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0032] Fig.10 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0033] Fig.11 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0034] Fig.12 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0035] Fig.13 is a schematic diagram of the structure of a heat pump system provided by one or more embodiments of the present application;

[0036] Fig.14 is a schematic diagram of a heat pump system provided by one or more embodiments of the present application;

[0037] Fig.15 is a schematic block diagram of a circuit of a heat pump system provided by one or more embodiments of the present application;

[0038] Fig.16 is a schematic block diagram of a circuit of a heat pump system provided by one or more embodiments of the present application;

[0039] Fig.17 is a schematic block diagram of a circuit of a heat pump system provided by one or more embodiments of the present application;

[0040] Fig.18 is a schematic block diagram of a circuit of a heat pump system provided by one or more embodiments of the present application;

[0041] In the figure: 100, heat pump circuit; 101, compressor; 102, first heat exchanger; 103, second heat exchanger; 104, third heat exchanger; 105, first electronic expansion valve; 106, second electronic expansion valve; 107, first hot water storage tank; 108, second hot water storage tank; 109, first water circulation pipeline; 110, first circulating water pump; 111, first water replenishment pipeline; 112, first water replenishment valve; 113, first water supply pipeline; 114, first water outlet valve; 115, reversing valve; 116, second water replenishment pipeline; 117, second water replenishment valve; 118, second water supply pipeline; 119, second water outlet valve; 120 , the second circulating water pump; 121, the second water circulating pipeline; 122, the bypass branch; 123, the bypass solenoid valve; 124, the regulating branch; 125, the regulating solenoid valve; 126, the auxiliary heating element; 127, the first water storage temperature sensor; 128, the second water storage temperature sensor; 129, the outdoor temperature sensor; 130, the first heat exchanger temperature sensor; 131, the first water outlet temperature sensor; 132, the second heat exchanger temperature sensor; 133, the second water outlet temperature sensor; 134, the third heat exchanger temperature sensor; 135, the outdoor fan; 20, the controller; 30, the control terminal; 40, the control circuit. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and settings discussed in itself. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and the use of other materials.

[0048] Figure 1 A schematic structural diagram of a heat pump system provided by one or more specific embodiments of the utility model is shown.

[0049] Heat pump systems are installed in buildings such as apartments, hotels, office buildings, and residences. In one or more embodiments of the present invention, the heat pump system is an air source heat pump. Air source heat pump (ASHP; also known as Air to Water, ATW) is a system that uses heat in the air to heat or cool a building. It is a type of heat pump system. From a functional perspective, it focuses more on heating and providing hot water in an energy-saving and environmentally friendly manner.

[0050] The heat pump system integrates a heat pump circuit 100. The heat pump circuit 100 is a vapor compression heat pump circuit 100. Specifically, the compressor 101, the first heat exchanger 102, the second heat exchanger 103, the first electronic expansion valve 105, the second electronic expansion valve 106 and the third heat exchanger 104 are sequentially connected through the refrigerant pipeline to form a refrigeration cycle. The refrigerant flows in the refrigeration cycle, wherein the first heat exchanger 102 and the second heat exchanger 103 are mainly used to further transfer the heat provided by the heat pump circuit 100 to the target medium (such as water), and the third heat exchanger 104 is used to absorb the heat of the heat source medium (such as air).

[0051] In one or more embodiments of the present application, the refrigerant is R32 refrigerant. R32 (dimethyl fluoroethane) has good heat transfer performance and has a lower global warming potential (GWP) than traditional chlorofluorocarbon (HCFC) and hydrochlorofluorocarbon (HFC) refrigerants, making it a relatively environmentally friendly refrigerant choice. In one or more embodiments of the present application, the refrigerant may also be other refrigerants, such as R410A, R290, etc. Due to the different physical properties of different refrigerants, each refrigerant corresponds to a refrigerant reference temperature, i.e., the upper limit of the water outlet temperature. Taking R32 as an example, the refrigerant reference temperature may be 60°C.

[0052] like Figure 1 As shown, the heat pump system further integrates a first hot water storage tank 107 and a second hot water storage tank 108 which are independently arranged.

[0053] In one or more embodiments of the present application, the first hot water storage tank 107 is used to store high-temperature water, and the second hot water storage tank is used to store low-temperature water.

[0054] The first heat exchanger 102 is configured to perform heat exchange between the refrigerant provided by the compressor 101 and water, and the water after heat exchange is stored in the first hot water storage tank 107 .

[0055] The second heat exchanger 103 is configured to perform heat exchange between the refrigerant passing through the first electronic expansion valve 105 and water, or to perform heat exchange between the refrigerant provided by the compressor 101 and water, and the water after heat exchange is stored in the second hot water storage tank 108 .

[0056] The refrigerant provided by the compressor 101 can utilize sensible heat or latent heat, or first utilize latent heat and then utilize sensible heat, to increase the water temperature in the first hot water storage tank 107 through the first heat exchanger 102, and can be operably exchanged with water through the second heat exchanger 103 after heat exchange with the first heat exchanger 102, or before heat exchange with the first heat exchanger 102, to increase the water temperature in the second hot water storage tank 108, thereby achieving the expansion of the range of the outlet water temperature under the condition of using only one compressor 101, overcoming the limitations of the physical properties of the refrigerant, and increasing the maximum outlet water temperature.

[0057] The first hot water storage tank 107 may be equipped with a first water circulation pipeline 109. The first water circulation pipeline 109 allows the water stored in the first hot water storage tank 107 to circulate as circulating water.

[0058] The first water circulation pipeline 109 may be provided with a first circulation water pump 110, which can pump water out of the first hot water storage tank 107, guide the water in the first water circulation pipeline 109 to flow into the first heat exchanger 102 and participate in the heat cycle of the heat pump circuit 100, so as to receive heat transferred by the first heat exchanger 102 for heating.

[0059] In one or more embodiments of the present application, the first circulating water pump 110 may be a centrifugal pump.

[0060] The first hot water storage tank 107 may also be equipped with a first water replenishment pipeline 111 , and the first water replenishment pipeline 111 is used to replenish water into the first hot water storage tank 107 .

[0061] The first water storage tank 107 may also be equipped with a first water supply pipeline 113, which is used to supply water to the water terminal. The water terminal connected to the first water supply pipeline 113 may be a heating device, that is, a radiator installed along the wall of the room, which dissipates heat by convection and radiation; or a hot water distribution system, which further distributes hot water to various locations where hot water is used, such as a bathroom, kitchen, and toilet.

[0062] In one or more embodiments of the present application, a first water replenishment valve 112 may be provided on the first water replenishment pipeline 111 , and the first water replenishment valve 112 may be operated manually or automatically. A first water outlet valve 114 may be provided on the first water supply pipeline 113 .

[0063] In one or more embodiments of the present application, the first hot water storage tank 107 may also be equipped with a first pressure relief valve to ensure that the first hot water storage tank 107 operates within a safe range.

[0064] Similarly, the second hot water storage tank 108 may be equipped with a second water circulation pipeline 121. The second water circulation pipeline 121 allows the water stored in the second hot water storage tank 108 to circulate as circulating water. The second water circulation pipeline 121 may be provided with a second circulating water pump 120, which can pump water from the second hot water storage tank 108, guide the water in the second water circulation pipeline 121 to flow into the second heat exchanger 103, and participate in the heat cycle of the heat pump circuit 100 to transfer heat.

[0065] In one or more embodiments of the present application, the second circulating water pump 120 may also be a centrifugal pump.

[0066] The second hot water storage tank 108 may also be equipped with a second water replenishment pipeline 116 , and the second water replenishment pipeline 116 is used to replenish water into the second hot water storage tank 108 .

[0067] Correspondingly, the second hot water storage tank 108 may also be equipped with a second water supply pipeline 118, which is used to supply water to the water terminal. The water terminal connected to the second water supply pipeline 118 may be a floor heating device, that is, a device that transfers heat by installing a heating element (such as a water pipe) under the floor of the room. The heat rises from the floor, so that the entire room is heated evenly. The water terminal may also be a fan coil unit, which uses the water supply to heat or cool the air and transfer it to a specific area of ​​the building.

[0068] In one or more embodiments of the present application, a second water replenishment valve 117 may be further provided on the second water replenishment pipeline 116 , and the second water replenishment valve 117 may be operated manually or automatically.

[0069] The second water supply pipeline 118 may be provided with a second water outlet valve 119. In one or more embodiments of the present application, the second hot water storage tank 108 may also be provided with a second pressure relief valve to ensure that the second hot water storage tank 108 operates within a safe range.

[0070] In one or more embodiments of the present application, the first hot water storage tank 107 and the second hot water storage tank 108 can be installed in an indoor environment such as a machine room or a mechanical room to prevent the water tank from freezing in the cold winter or overheating in the extremely hot summer. They can also be installed in indoor spaces such as a basement or a laundry room of a residence, which can provide relatively good environmental conditions for the equipment. The first hot water storage tank 107 and the second hot water storage tank 108 are preferably made of pressure-resistant and corrosion-resistant materials, such as stainless steel, plastic materials, etc., to ensure their long-term stable operation.

[0071] In one or more embodiments of the present application, the first heat exchanger 102 may be a water-fluorine heat exchanger, which is a conventional term specifically referring to a heat exchanger between a refrigerant and water, and the refrigerant is not limited to Freon. From a structural perspective, the first heat exchanger 102 may be a plate heat exchanger or a shell and tube heat exchanger. Exemplarily, when a plate heat exchanger is selected, the first water circulation pipeline 109 is fluidly connected to one flow channel in the plate heat exchanger, and the refrigerant pipeline in the heat pump circuit 100 is fluidly connected to another flow channel in the plate heat exchanger. Due to the thermal conductivity of the plate heat exchanger, heat is transferred from the hot side to the cold side, and the two fluids achieve heat exchange. For ease of description, in the first heat exchanger 102, the flow channel through which water flows is defined as the first water flow flow channel (not shown), and the flow channel through which the refrigerant flows is defined as the first refrigerant flow channel (not shown).

[0072] In one or more embodiments of the present application, the second heat exchanger 103 may be a water-fluorine heat exchanger, and the definition of the water-fluorine heat exchanger is as described above. From a structural perspective, the second heat exchanger 103 may be a plate heat exchanger or a shell and tube heat exchanger. For example, when a plate heat exchanger is selected, the second water circulation pipeline 121 is fluidly connected to one flow channel in the plate heat exchanger, and the refrigerant pipeline in the heat pump circuit 100 is fluidly connected to another flow channel in the plate heat exchanger. Due to the thermal conductivity of the plate heat exchanger, heat is transferred from the hot side to the cold side, and the two fluids achieve heat exchange. For ease of description, in the second heat exchanger 103, the flow channel through which water flows is defined as the second water flow flow channel (not shown), and the flow channel through which the refrigerant flows is defined as the second refrigerant flow channel (not shown).

[0073] In one or more embodiments of the present application, a first outlet water temperature sensor 131 for detecting the outlet water temperature may be provided at the outlet of the first water circulation channel.

[0074] In one or more embodiments of the present application, a second outlet water temperature sensor 132 for detecting the outlet water temperature may be provided at the outlet of the second water circulation channel.

[0075] In one or more embodiments of the present application, the heat pump system may also be provided with a first heat exchanger temperature sensor 130 for detecting the temperature of the first heat exchanger 102. For example, the first heat exchanger temperature sensor 130 may be provided on the first refrigerant circulation channel, for example, at the outlet of the first refrigerant circulation channel.

[0076] In one or more embodiments of the present application, the heat pump system may also be provided with a second heat exchanger temperature sensor 132 for detecting the temperature of the second heat exchanger 103. Exemplarily, the second heat exchanger temperature sensor 132 may be provided on the second refrigerant circulation channel, for example, at the outlet of the second refrigerant circulation channel.

[0077] In one or more embodiments of the present application, the heat pump system is further provided with a first water storage temperature sensor 127, which is disposed in the first hot water storage tank 107. The first water storage temperature sensor 127 is used to detect the temperature of water stored in the first hot water storage tank 107 and generate a first water storage temperature signal.

[0078] In one or more embodiments of the present application, the heat pump system is further provided with a second water storage temperature sensor 128, which is disposed in the second hot water storage tank 108. The second water storage temperature sensor 128 is used to detect the temperature of water stored in the second hot water storage tank 108 and generate a second water storage temperature signal.

[0079] The third heat exchanger 104 can perform heat exchange with the air guided by the outdoor fan 135, so that the refrigerant flowing in the third heat exchanger 104 undergoes a phase change from a liquid phase to a gas phase, and flows back to the compressor 101 after the phase change. The third heat exchanger 104 is provided with a third heat exchanger temperature sensor 134, i.e., a coil temperature sensor, for detecting the surface temperature of the third heat exchanger 104, and an outdoor temperature sensor 129 for detecting the outdoor ambient temperature.

[0080] The controller 20 of the heat pump system is arranged in an electrical appliance with good sealing performance and heat dissipation function. The controller 20 includes components such as a processor, a storage unit, an input / output interface, and a communication interface. The processor may be a dedicated processor, a central processing unit (CPU), etc. The processor may access the storage unit to execute instructions or applications stored in the storage unit to implement related functions, such as adjusting the speed of the motor driving the compressor 101 to run (i.e., adjusting the frequency of the compressor 101) through a program. The instructions or applications stored in the storage unit are programs disclosed in the prior art or programs compiled based on algorithms disclosed in the prior art, which are not the protection content of the utility model and are not described in detail here. The storage unit may include a volatile memory and / or a non-volatile memory. The input / output interface may be connected to the above-mentioned various sensors in communication to receive the detection values ​​of various sensors. The input / output interface is also connected to the compressor 101, the outdoor fan 135 and other devices in communication to output the control instructions generated by the processor. The communication interface can support different wireless communication protocols, such as Wi-Fi, Bluetooth, near-field communication, NB-IoT, etc., to communicate with other electronic devices, including but not limited to cloud servers, computers (host computers), smart phones, tablets, PDAs, smart control tools, wearable devices and vehicle-mounted equipment, etc.

[0081] In one or more embodiments of the present application, the heat pump system includes a control terminal 30, which is in communication with the controller 20. The control terminal 30 has a user-friendly interface and can be operated through a touch screen, a remote controller or other methods. For example, a first set water temperature of the first hot water storage tank and a second set water temperature of the second hot water storage tank can be input. The control terminal 30 generates a set water temperature signal for the first hot water storage tank based on the first set water temperature and generates a set water temperature signal for the second hot water storage tank based on the second set water temperature.

[0082] The control terminal 30 may be a centralized controller, a combination of a centralized controller and a wired controller, or a computer, a tablet computer, a smart phone, a wearable device, etc.

[0083] In one or more embodiments of the present application, the first heat exchanger 102 is configured to perform heat exchange between the refrigerant and water that produces a phase change from gas phase to liquid phase provided by the compressor 101. Alternatively, the first heat exchanger 102 is also configured to perform heat exchange between the gas phase refrigerant and water provided by the compressor 101.

[0084] In one or more embodiments of the present application, the heat pump system further includes a bypass branch 122. The bypass branch 122 is arranged in parallel with the first electronic expansion valve 105, and a bypass solenoid valve 123 is arranged on the bypass branch 122. The first heat exchanger 102 is configured to perform heat exchange between the refrigerant and water that produces a phase change from gas phase to liquid phase provided by the compressor 101, and the bypass solenoid valve 123 keeps the bypass branch 122 closed to guide the refrigerant that produces a phase change from gas phase to liquid phase to enter the second heat exchanger 103 after passing through the first electronic expansion valve 105. The second heat exchanger 103 performs heat exchange between the refrigerant that produces a phase change from gas phase to liquid phase and water that passes through the first electronic expansion valve 105.

[0085] In one or more embodiments of the present application, the first heat exchanger 102 is configured to perform heat exchange between the gas-phase refrigerant and water provided by the compressor 101, and the bypass solenoid valve 123 keeps the bypass branch 122 open to guide the gas-phase refrigerant to pass through the bypass branch 122 and the first electronic expansion valve 105 and then enter the second heat exchanger 103. The second heat exchanger 103 performs heat exchange between the gas-phase refrigerant and water through the first electronic expansion valve 105.

[0086] In one or more embodiments of the present application, the heat pump system further includes a regulating branch 124. One end of the regulating branch 124 is fluidly connected to the compressor 101, and the other end of the regulating branch 124 is fluidly connected to the second heat exchanger 103. A regulating solenoid valve 125 is provided on the regulating branch 124. The regulating solenoid valve 125 keeps the regulating branch 124 closed, and the first heat exchanger 102 performs heat exchange between the refrigerant provided by the compressor 101 and producing a phase change from gas phase to liquid phase and water, or can perform heat exchange between the gas phase refrigerant provided by the compressor 101 and water, and the regulating solenoid valve 125 keeps the regulating branch 124 open, and the second heat exchanger 103 performs heat exchange between the refrigerant provided by the compressor 101 and water.

[0087] In one or more embodiments of the present application, the heat pump system further includes an auxiliary heating element 126. The auxiliary heating element 126 may be an electric heating element, which is disposed in the first hot water storage tank 107.

[0088] From the perspective of principle, the heat pump system has different working states. More specifically, it adopts the method of classified recovery of sensible heat and latent heat, such as Fig.14 As shown. Sensible heat recovery, the refrigerant remains in high-temperature and high-pressure gas phase, and no phase change occurs in the first heat exchanger 102. The temperature of the refrigerant drops from the high temperature at the exhaust end of the compressor 101 and remains higher than the condensation temperature. Latent heat recovery, the refrigerant is converted from gas phase to liquid phase, and the refrigerant temperature remains unchanged.

[0089] Reference Figures 3 to 5 , introduce different working states one by one. Figures 3 to 5In the working states shown, the heating mode is taken as an example for description, that is, the reversing valve 115 (four-way valve) in the figure keeps the DE port connected and the SC port connected.

[0090] Figure 3 The working state 1 of the heat pump system is shown. In one or more embodiments of the present application, the low-temperature and low-pressure refrigerant enters the compressor 101, and the compressor 101 compresses it into a gas-phase refrigerant in a high-temperature and high-pressure state and discharges the compressed gas-phase refrigerant. At this time, the regulating solenoid valve 125 keeps closing the regulating branch 124, and the gas-phase refrigerant discharged by the compressor 101 is supplied to the first heat exchanger 102.

[0091] At this time, the first heat exchanger 102 is used as a condenser, and the high-temperature and high-pressure gas-phase refrigerant discharged from the compressor 101 undergoes a phase change in the first heat exchanger 102, that is, the first heat exchanger 102 used as a condenser condenses the gas-phase refrigerant supplied by the compressor 101 into a liquid phase, and the heat is released into the first water flow circulation channel through the condensation process. The first circulating water pump 110 is operated at the same time, so that the water in the first water circulation pipeline 109 flows into the first water flow circulation channel, and the heat dissipated by the refrigerant can increase the water temperature in the first water flow circulation channel, and the heated water enters the first hot water storage tank 107 for further heating or use.

[0092] The bypass solenoid valve 123 keeps the bypass branch 122 closed, and the refrigerant flowing out of the first heat exchanger 102 and undergoing a phase change from gas to liquid passes through the first electronic expansion valve 105. The first electronic expansion valve 105 expands the high-temperature and high-pressure liquid refrigerant condensed in the first heat exchanger 102 into a medium-temperature and medium-pressure liquid refrigerant.

[0093] The medium-temperature medium-pressure liquid refrigerant enters the second heat exchanger 103. The second circulating water pump 120 is operated at the same time, so that the water in the second water circulation pipeline 121 flows into the second water flow circulation channel, and the heat dissipated by the refrigerant increases the water temperature in the second water flow circulation channel, and the heated water enters the second hot water storage tank 108 for use.

[0094] Since the temperature of the liquid phase refrigerant continues to drop in the second refrigerant circulation channel, it is supercooled in the second heat exchanger 103. The supercooled refrigerant flows into the second electronic expansion valve 106, and the second electronic expansion valve 106 expands the supercooled liquid phase refrigerant in the second heat exchanger 103 into a low-temperature and low-pressure two-phase refrigerant. The low-temperature and low-pressure two-phase refrigerant further enters the third heat exchanger 104. The third heat exchanger 104 is now working in the evaporator state, the outdoor fan 135 is running, the evaporator evaporates the expanded refrigerant, and returns the refrigerant in the low-temperature and low-pressure state to the compressor 101. In the whole cycle, the heat pump system uses sensible heat and latent heat to achieve the supply of hot water.

[0095] The circulation of the refrigerant is shown by arrow F1 in the figure.

[0096] In one or more embodiments of the present application, the heat pump system further includes a control circuit 40, which is configured to receive a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a first drive signal to the regulating solenoid valve to keep the regulating branch closed, so as to perform heat exchange between the refrigerant provided by the compressor and water in the first heat exchanger, and the water after heat exchange is stored in the first hot water storage tank, and perform heat exchange between the refrigerant passing through the first solenoid valve and water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

[0097] The control circuit 40 may be implemented by a controller. The principle that a processor compares digital signals and generates drive signals is common knowledge and will not be described in detail here.

[0098] In one or more embodiments of the present application, the control circuit 40 may also be implemented by a combination of a comparator and a logic gate circuit. Exemplarily, when the first water storage temperature is lower than the first set water temperature and the second water storage temperature is lower than the second set water temperature, the control circuit 40 generates a first drive signal to the regulating solenoid valve to keep the regulating branch closed.

[0099] Specifically, the water temperature setting signal of the first hot water storage tank can be connected to the inverting input terminal of a comparator circuit (taking an operational amplifier as an example), and the first water storage temperature signal can be connected to the non-inverting input terminal; the water temperature setting signal of the second hot water storage tank can be connected to the inverting input terminal of another comparator circuit (taking an operational amplifier as an example), and the second water storage temperature signal can be connected to the non-inverting input terminal; the power pin of the comparator circuit can be connected to the power supply.

[0100] The output ends of the two operational amplifiers can be connected to the input ends of an AND gate circuit. In this way, when the first water storage temperature is lower than the first set temperature and the second water storage temperature is lower than the second set water temperature, the output end of the AND gate circuit can output a level signal (for example, a low level or a high level signal), that is, a first drive signal; the first drive signal can further be output to the regulating solenoid valve to put it in a closed valve state to keep the regulating branch closed.

[0101] Figure 4 The operating state 2 of the heat pump system is shown.

[0102] In one or more embodiments of the present application, a low-temperature, low-pressure refrigerant enters the compressor 101, and the compressor 101 compresses it into a gas-phase refrigerant in a high-temperature, high-pressure state and discharges the compressed gas-phase refrigerant; the discharged gas-phase refrigerant flows into the first heat exchanger 102, and the first heat exchanger 102 cools the high-temperature, high-pressure gas-phase refrigerant into a high-pressure, medium-temperature gas-phase refrigerant with a high pressure but a temperature higher than the condensation temperature (which can be achieved by adjusting the frequency of the compressor 101). The condensation temperature refers to the temperature at which the refrigerant undergoes a phase change in the condenser, from a gas phase to a liquid phase. In this process, although the refrigerant does not undergo a phase change, it still releases heat into the first water flow circulation channel, thereby increasing the water temperature in the first water flow circulation channel.

[0103] The bypass solenoid valve 123 keeps the bypass branch 122 in the conducting state, and the high-pressure medium-temperature gas-phase refrigerant flowing through the bypass branch 122 and the first electronic expansion valve 105 remains in the gas phase. The gas-phase refrigerant enters the second heat exchanger 103, and the second heat exchanger 103 is used as a condenser. The high-pressure medium-temperature gas-phase refrigerant undergoes a phase change in the second heat exchanger 103, that is, the second heat exchanger 103 used as a condenser cools the refrigerant into a high-pressure medium-temperature liquid-phase refrigerant.

[0104] The second electronic expansion valve 106 further expands the liquid refrigerant that has undergone phase change in the second heat exchanger 103 into a low-temperature, low-pressure two-phase refrigerant. The low-temperature, low-pressure two-phase refrigerant further enters the third heat exchanger 104. The third heat exchanger 104 is now operating in the evaporator state, the outdoor fan 135 is operating, the evaporator evaporates the expanded refrigerant, and returns the refrigerant in the low-temperature, low-pressure state to the compressor 101. In this process, the first heat exchanger 102 utilizes the sensible heat of the refrigerant to exchange heat with the water in the first hot water storage tank 107 to achieve a heating effect.

[0105] That is, the control circuit 40 is further configured to receive a reference temperature signal, a first hot water tank set water temperature signal, a second hot water tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a third drive signal to the bypass solenoid valve to keep the bypass branch closed, so as to perform heat exchange between the refrigerant provided by the compressor and producing a phase change from gas phase to liquid phase and water in the first heat exchanger; or to receive the reference temperature signal, the first hot water tank set water temperature signal, the second hot water tank set water temperature signal, the first water storage temperature signal, and the second water storage temperature signal, and generate a fourth drive signal to the bypass solenoid valve to keep the bypass branch open, so as to perform heat exchange between the gas-phase refrigerant provided by the compressor and water in the first heat exchanger.

[0106] Exemplarily, the control circuit 40 may generate a third driving signal to the bypass solenoid valve to keep the bypass branch closed when the first water storage temperature is lower than the first set temperature and the second water storage temperature is lower than the second set temperature.

[0107] The control circuit 40 may also generate a fourth drive signal to the bypass solenoid valve to keep the bypass branch open when the first water storage temperature is higher than the refrigerant reference temperature, but the first water storage temperature is lower than the first set temperature, and the second water storage temperature is lower than the second set temperature. The refrigerant reference temperature may be generated by detecting the temperature of a reference heat source by a temperature sensor.

[0108] The control circuit 40 may be implemented by a controller.

[0109] The control circuit 40 can also be implemented by a combination of a comparator and a logic gate. For example, the output of one comparator can be used to indicate whether the first water storage temperature is lower than the first set temperature, and the output of another comparator can be used to indicate whether the second water storage temperature is lower than the second set temperature, and the two outputs are connected to the two input ends of an AND gate circuit. When the first water storage temperature is lower than the first set temperature and the second water storage temperature is lower than the second set temperature, the output of the AND gate circuit is the third drive signal, and the third drive signal can be used to drive the bypass solenoid valve to operate and keep the bypass branch closed. Exemplarily, the output of the third comparator can also be used to indicate whether the first water storage temperature is higher than the refrigerant reference temperature, and the output of this comparator and the output of the above-mentioned AND gate circuit are connected to the two input ends of another AND gate circuit. When the first water storage temperature is lower than the first set temperature but higher than the refrigerant reference temperature, and the second water storage temperature is lower than the second set temperature, the output of the second AND gate circuit is the fourth drive signal, and the fourth drive signal can be used to drive the bypass solenoid valve to operate and keep the bypass branch open.

[0110] Exemplarily, when the actual water temperature of the first hot water storage tank 107 is higher than 60° C. but lower than the first set temperature, and the water temperature of the second hot water storage tank 108 is lower than the second set temperature, heating can be achieved through the above-mentioned working state 2.

[0111] The circulation of the refrigerant is shown by arrow 2 in the figure.

[0112] Figure 5 The operating state 3 of the heat pump system is shown.

[0113] In one or more embodiments of the present application, low-temperature and low-pressure refrigerant enters the compressor 101, and the compressor 101 compresses it into a high-temperature and high-pressure gas-phase refrigerant and discharges the compressed gas-phase refrigerant. At this time, the regulating solenoid valve 125 keeps the regulating branch 124 in a conducting state, and the discharged gas-phase refrigerant will flow directly into the second heat exchanger 103 through the regulating branch 124. At this time, the second heat exchanger 103 is used as a condenser, and the high-temperature and high-pressure refrigerant discharged from the compressor 101 undergoes a phase change in the second heat exchanger 103, that is, the second heat exchanger 103 used as a condenser condenses the compressed refrigerant into a liquid phase, and the heat is released into the second water flow circulation channel through the condensation process, thereby increasing the water temperature in the second water flow circulation channel.

[0114] The second electronic expansion valve 106 expands the refrigerant condensed into a liquid phase into a low-temperature, low-pressure two-phase refrigerant. The low-temperature, low-pressure two-phase refrigerant further enters the third heat exchanger 104. The third heat exchanger 104 is now operating in an evaporator state, the outdoor fan 135 is operating, the evaporator evaporates the expanded refrigerant, and returns the refrigerant in a low-temperature, low-pressure state to the compressor 101.

[0115] The control circuit 40 is further configured to receive a first hot water tank set water temperature signal, a second hot water tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a second drive signal to the regulating solenoid valve to keep the regulating branch open, so as to perform heat exchange between the refrigerant provided by the compressor and water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

[0116] The control circuit 40 may be implemented by a controller.

[0117] The control circuit 40 may also be implemented by a comparator and a logic gate circuit.

[0118] Exemplarily, the output of one comparator can be used to indicate whether the first water storage temperature is higher than the first set temperature, and the output of another comparator can be used to indicate whether the second water storage temperature is higher than the second set temperature, and the outputs of the two comparators are connected to an AND gate circuit; when the first water storage temperature is higher than the first set temperature and the second water storage temperature is lower than the second set temperature, the output of the AND gate circuit is the second drive signal.

[0119] Exemplarily, when the water temperature of the first hot water storage tank 107 reaches a set temperature higher than 60° C. and the water temperature of the second hot water storage tank 108 is lower than the set temperature, heating can be achieved through the above-mentioned working state 3.

[0120] The circulation of the refrigerant is shown by arrow 3 in the figure.

[0121] Figure 6 The operating state 4 of the heat pump system is shown.

[0122] In one or more embodiments of the present application, the auxiliary heating element 126 can be kept running, and the first circulating water pump 110 can be kept running. Meanwhile, the second circulating water pump 120, the outdoor fan 135, and the compressor 101 are all in a closed state.

[0123] Exemplarily, when the water temperature of the first hot water storage tank 107 does not reach the set temperature, but the water temperature of the second hot water storage tank 108 reaches the set temperature, heating can be achieved through the above process.

[0124] The control circuit 40 is further configured to receive the first hot water tank set water temperature signal, the second hot water tank set water temperature signal, the first water storage temperature signal and the second water storage temperature signal, and generate a fifth driving signal to the auxiliary heating element to drive the auxiliary heating element to operate.

[0125] The control circuit 40 may be implemented by a controller.

[0126] The control circuit 40 may also be implemented by a comparator and a logic gate circuit.

[0127] Exemplarily, the output of one comparator can indicate whether the first water storage temperature is higher than the first set temperature, and the output of another comparator can indicate whether the second water storage temperature is higher than the second set temperature, and the outputs of the two comparators are connected to an AND gate circuit; when the first water storage temperature is lower than the first set temperature and the second water storage temperature is higher than the second set temperature, the output of the AND gate circuit is the fifth drive signal.

[0128] like Figure 7 As shown, in one or more embodiments of the present application, a large-caliber, small-pressure-loss electronic expansion valve can be selected to simultaneously realize the functions of the bypass solenoid valve 123 and the first electronic expansion valve 105, that is, the two functions of throttling and on-off control are realized through the first electronic expansion valve 105.

[0129] In one or more embodiments of the present application, Figures 8 to 13 As shown, the first heat exchanger 102 in the heat pump system is configured to allow the gas-phase refrigerant provided by the compressor 101 to flow therethrough, the second heat exchanger 103 is configured to perform heat exchange between the refrigerant passing through the first electronic expansion valve 105 at the maximum opening and water, and the water after heat exchange is stored in the second hot water storage tank 108, and the third heat exchanger 104 is configured to perform heat exchange between the refrigerant passing through the second electronic expansion valve 106 and the heat source, and the refrigerant after heat exchange flows back to the compressor 101. The gas-phase refrigerant provided by the compressor 101 flows through the first heat exchanger 102, and the first circulating water pump 110 stops running.

[0130] From the perspective of circuit design, the control circuit 40 is configured to receive a reference temperature signal, a set water temperature signal of the first hot water storage tank, a set water temperature signal of the second hot water storage tank, a first water storage temperature signal, and a second water storage temperature signal, and generate a shutdown drive signal to the first circulating water pump to stop the first circulating water pump, so that the gas-phase refrigerant provided by the compressor passes through the first heat exchanger and exchanges heat with water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

[0131] The control circuit 40 may be implemented by a controller.

[0132] The control circuit 40 may also be implemented by a comparator and a logic gate circuit.

[0133] For example, the output of one comparator can be used to indicate whether the first water storage temperature is higher than the first set water temperature, and the output of another comparator can be used to indicate whether the second water storage temperature is higher than the second set temperature, and the outputs of the two comparators are connected to an AND gate circuit. When the first water storage temperature is higher than the first set temperature and the second water storage temperature is lower than the second set temperature, the output of the AND gate circuit is a shutdown drive signal. The shutdown drive signal is further used to stop the first circulating water pump.

[0134] The control circuit 40 is also configured to receive a reference temperature signal, a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a working drive signal to the first circulating water pump to keep the first circulating water pump running, so that the first heat exchanger can perform heat exchange between the refrigerant provided by the compressor that produces a phase change from gas phase to liquid phase and water, or can perform heat exchange between the gas phase refrigerant provided by the compressor and water.

[0135] The control circuit 40 may be implemented by a controller.

[0136] The control circuit 40 may also be implemented by a comparator and a logic gate circuit.

[0137] Exemplarily, the output of one comparator can be used to indicate whether the first water storage temperature is higher than the first set water temperature, and the output of another comparator can be used to indicate whether the second water storage temperature is higher than the second set temperature, and the outputs of the two comparators are connected to an AND gate circuit. When the first water storage temperature is lower than the first set temperature and the second water storage temperature is lower than the second set temperature, the output of the AND gate circuit is the working drive signal. The working drive signal is further used to keep the first circulating water pump in operation.

[0138] Reference Figures 9 to 12 , introduce different working states one by one. Figures 9 to 12In the working state shown, heating is taken as an example, that is, the reversing valve 115 (four-way valve) in the figure keeps the DE port connected and the SC port connected.

[0139] Fig. 9 The working state 1 of the heat pump system is shown. In one or more embodiments of the present application, the low-temperature and low-pressure refrigerant enters the compressor 101, and the compressor 101 compresses it into a gas-phase refrigerant in a high-temperature and high-pressure state and discharges the compressed gas-phase refrigerant. The gas-phase refrigerant discharged by the compressor 101 is supplied to the first heat exchanger 102.

[0140] At this time, the first heat exchanger 102 is used as a condenser, and the high-temperature and high-pressure gas-phase refrigerant discharged from the compressor 101 undergoes a phase change in the first heat exchanger 102, that is, the first heat exchanger 102 used as a condenser condenses the gas-phase refrigerant supplied by the compressor 101 into a liquid phase, and the heat is released into the first water flow channel through the condensation process. The first circulating water pump 110 is operated at the same time, so that the water in the first water circulation pipeline 109 flows into the first water flow channel, and the refrigerant dissipates heat to increase the water temperature in the first water flow channel, and the heated water enters the first hot water storage tank 107.

[0141] The bypass solenoid valve 123 keeps the bypass branch 122 closed, and the refrigerant flowing out of the first heat exchanger 102 and undergoing a phase change from gas to liquid passes through the first electronic expansion valve 105. The first electronic expansion valve 105 expands the high-temperature and high-pressure liquid refrigerant condensed in the first heat exchanger 102 into a medium-temperature and medium-pressure liquid refrigerant.

[0142] The medium-temperature medium-pressure liquid refrigerant enters the second heat exchanger 103. The second circulating water pump 120 is operated at the same time, so that the water in the second water circulation pipeline 121 flows into the second water flow channel, and the refrigerant dissipates heat to increase the water temperature in the second water flow channel, and the heated water enters the second hot water storage tank 108.

[0143] Since the temperature of the liquid phase refrigerant continues to drop in the second refrigerant circulation channel, it is supercooled in the second heat exchanger 103. The supercooled refrigerant flows into the second electronic expansion valve 106, and the second electronic expansion valve 106 expands the supercooled liquid phase refrigerant in the second heat exchanger 103 into a low-temperature and low-pressure two-phase refrigerant. The low-temperature and low-pressure two-phase refrigerant further enters the third heat exchanger 104. The third heat exchanger 104 is now working in the evaporator state, the outdoor fan 135 is working, the evaporator evaporates the expanded refrigerant, and returns the refrigerant in the low-temperature and low-pressure state to the compressor 101. In this process, the first heat exchanger 102 uses the latent heat of condensation of the refrigerant to exchange heat with the water in the first hot water storage tank 107 to achieve a heating effect, and the second heat exchanger 103 uses the sensible heat of the refrigerant to exchange heat with the water in the second hot water storage tank 108 to achieve a heating effect. In the entire cycle, the heat pump system uses sensible heat and latent heat to achieve the supply of hot water.

[0144] Assuming that the first hot water storage tank 107 is a high-temperature water tank and the second hot water storage tank 108 is a low-temperature water tank, and taking R32 refrigerant as an example, when the set temperature of the first hot water storage tank 107 is higher than 60°C, the actual water temperature is lower than 60°C, and the actual water temperature of the first hot water storage tank 107 is lower than the set water temperature, heating can be achieved through the above-mentioned working process 1.

[0145] The circulation of the refrigerant is shown by arrow F1 in the figure.

[0146] Fig.10 The operating state 2 of the heat pump system is shown.

[0147] In one or more embodiments of the present application, a low-temperature, low-pressure refrigerant enters the compressor 101, and the compressor 101 compresses it into a high-temperature, high-pressure gas-phase refrigerant and discharges the compressed gas-phase refrigerant; the discharged gas-phase refrigerant flows into the first heat exchanger 102, and the first heat exchanger 102 cools the high-temperature, high-pressure gas-phase refrigerant into a high-pressure, medium-temperature gas-phase refrigerant with a high pressure but a temperature higher than the condensation temperature. The condensation temperature refers to the temperature at which the refrigerant undergoes a phase change in the condenser, from the gas phase to the liquid phase. In this process, although no phase change occurs, heat is still released into the first water flow circulation channel, raising the water temperature in the first water flow circulation channel.

[0148] The bypass solenoid valve 123 keeps the bypass branch 122 in the conducting state, and the high-pressure medium-temperature gas-phase refrigerant flowing through the bypass branch 122 and the first electronic expansion valve 105 remains in the gas phase. The gas-phase refrigerant enters the second heat exchanger 103, and the second heat exchanger 103 is used as a condenser. The high-pressure medium-temperature gas-phase refrigerant undergoes a phase change in the second heat exchanger 103, that is, the second heat exchanger 103 used as a condenser cools the refrigerant into a high-pressure medium-temperature liquid-phase refrigerant.

[0149] The second electronic expansion valve 106 further expands the liquid refrigerant that has undergone phase change in the second heat exchanger 103 into a low-temperature, low-pressure two-phase refrigerant. The low-temperature, low-pressure two-phase refrigerant further enters the third heat exchanger 104. The third heat exchanger 104 is now operating in an evaporator state, and the outdoor fan 135 is in operation. The evaporator evaporates the expanded refrigerant and returns the refrigerant in a low-temperature, low-pressure state to the compressor 101. In this process, the first heat exchanger 102 utilizes the sensible heat of the refrigerant to exchange heat with the water in the first hot water storage tank 107 to achieve a heating effect.

[0150] For example, when the water temperature of the first hot water storage tank 107 is higher than 60° C. but lower than the set temperature, and the water temperature of the second hot water storage tank 108 is lower than the set temperature, heating can be achieved through the above-mentioned working state 2.

[0151] The circulation of the refrigerant is shown by arrow F2 in the figure.

[0152] Fig.11 The operating state 3 of the heat pump system is shown.

[0153] The circulation of the refrigerant is shown by arrow F3 in the figure.

[0154] In one or more embodiments of the present application, the low-temperature and low-pressure refrigerant enters the compressor 101, and the compressor 101 compresses it into a high-temperature and high-pressure gas-phase refrigerant and discharges the compressed gas-phase refrigerant. The gas-phase refrigerant passes through the first heat exchanger 102, and since the first circulating water pump 110 is in a stopped state at this time, it does not cause a large fluctuation in the water temperature in the first hot water storage tank 107.

[0155] The discharged gas phase refrigerant directly flows into the second heat exchanger 103. At this time, the second heat exchanger 103 is used as a condenser, and the high-temperature and high-pressure refrigerant discharged from the compressor 101 undergoes a phase change in the second heat exchanger 103, that is, the second heat exchanger 103 used as a condenser condenses the compressed refrigerant into a liquid phase, and the heat is released into the second water flow circulation channel through the condensation process, thereby increasing the water temperature in the second water flow circulation channel.

[0156] The second electronic expansion valve 106 expands the refrigerant condensed into a liquid phase into a low-temperature, low-pressure two-phase refrigerant. The low-temperature, low-pressure two-phase refrigerant further enters the third heat exchanger 104. The third heat exchanger 104 is now operating in an evaporator state, the outdoor fan 135 is in an operating state, the evaporator evaporates the expanded refrigerant, and returns the refrigerant in a low-temperature, low-pressure state to the compressor 101.

[0157] Exemplarily, when the water temperature of the first hot water storage tank 107 reaches the set temperature and the water temperature of the second hot water storage tank 108 is lower than the set temperature, heating can be achieved through the above process.

[0158] Fig.12 The operating state 4 of the heat pump system is shown.

[0159] In one or more embodiments of the present application, the auxiliary heating element 126 can be kept running, and the first circulating water pump 110 can be kept running. Meanwhile, the second circulating water pump 120, the outdoor fan 135, and the compressor 101 are all in a closed state.

[0160] Exemplarily, when the water temperature of the first hot water storage tank 107 does not reach the set temperature, but the water temperature of the second hot water storage tank 108 reaches the set temperature, heating can be achieved through the above process.

[0161] like Fig.13 As shown, in one or more embodiments of the present application, a large-caliber, small-pressure-loss electronic expansion valve can be selected to simultaneously realize the functions of the bypass solenoid valve 123 and the first electronic expansion valve 105, that is, the two functions of throttling and on-off control are realized through the first electronic expansion valve 105.

[0162] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0163] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by technicians familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A heat pump system, characterized in that: include: a first hot water storage tank, wherein a first water storage temperature sensor is disposed, and the first water storage temperature sensor can detect and generate a first water storage temperature signal; A second hot water storage tank is provided independently of the first hot water storage tank, wherein a second water storage temperature sensor is provided, and the second water storage temperature sensor can detect and generate a second water storage temperature signal; A heat pump circuit, comprising a compressor, a first heat exchanger, a first electronic expansion valve, a second heat exchanger, a second electronic expansion valve and a third heat exchanger connected in sequence; a regulating branch, one end of which is fluidically connected to the compressor, and the other end of which is fluidically connected to the second heat exchanger, and on which a regulating solenoid valve is disposed; A control terminal configured to generate a first hot water storage tank set water temperature signal and a second hot water storage tank set water temperature signal; and The control circuit is configured to receive a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a first drive signal to the regulating solenoid valve to keep the regulating branch closed, so as to perform heat exchange between the refrigerant provided by the compressor and water in the first heat exchanger, and the water after heat exchange is stored in the first hot water storage tank, and perform heat exchange between the refrigerant passing through the first electronic expansion valve and water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

2. The heat pump system according to claim 1, characterized in that: The control circuit is further configured to receive a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a second drive signal to the regulating solenoid valve to keep the regulating branch conductive, so as to perform heat exchange between the refrigerant provided by the compressor and water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

3. The heat pump system according to claim 1, characterized in that: The first heat exchanger is configured to perform heat exchange between the refrigerant provided by the compressor and undergoing a phase change from gas phase to liquid phase and water; or to perform heat exchange between the gas phase refrigerant provided by the compressor and water.

4. The heat pump system according to claim 3, characterized in that: The first heat exchanger has: a first refrigerant flow passage configured to allow refrigerant to flow therein; and a first water circulation passage configured to allow water to flow therein, the first water circulation passage being fluidically connected to the first hot water storage tank; The second heat exchanger has: a second refrigerant flow passage configured to allow refrigerant to flow therein; and a second water circulation passage configured to allow water to flow therein, the second water circulation passage being fluidically connected to the second hot water storage tank; The heat pump system further comprises: A bypass branch, one end of which is fluidically connected to the first refrigerant circulation channel, and the other end of which is fluidically connected to the second refrigerant circulation channel. A bypass solenoid valve is arranged on the bypass branch, and the bypass branch is connected in parallel with the first electronic expansion valve.

5. The heat pump system according to claim 4, characterized in that: The control circuit is further configured to receive a reference temperature signal, a first hot water tank set water temperature signal, a second hot water tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a third drive signal to the bypass solenoid valve to keep the bypass branch closed, so as to perform heat exchange between the refrigerant provided by the compressor and producing a phase change from gas phase to liquid phase and water in the first heat exchanger.

6. The heat pump system according to claim 4, characterized in that: The control circuit is further configured to receive a reference temperature signal, a first hot water storage tank set water temperature signal, a second hot water storage tank set water temperature signal, a first water storage temperature signal, and a second water storage temperature signal, and generate a fourth drive signal to the bypass solenoid valve to keep the bypass branch open, so as to perform heat exchange between the gas-phase refrigerant provided by the compressor and water in the first heat exchanger.

7. The heat pump system according to any one of claims 1 to 6, characterized in that: The first hot water storage tank is also provided with an auxiliary heating element; The control circuit is further configured to receive the first hot water tank set water temperature signal, the second hot water tank set water temperature signal, the first water storage temperature signal and the second water storage temperature signal, and generate a fifth driving signal to the auxiliary heating element to drive the auxiliary heating element to operate.

8. A heat pump system, characterized in that: include: a first hot water storage tank, wherein a first water storage temperature sensor is disposed, and the first water storage temperature sensor can detect and generate a first water storage temperature signal; A second hot water storage tank is provided independently of the first hot water storage tank, wherein a second water storage temperature sensor is provided, and the second water storage temperature sensor can detect and generate a second water storage temperature signal; A heat pump circuit, comprising a compressor, a first heat exchanger, a first electronic expansion valve, a second heat exchanger, a second electronic expansion valve and a third heat exchanger connected in sequence; wherein the first heat exchanger has a first water flow channel fluidly connected to the first hot water storage tank; a first water circulation loop, the fluid of which is connected to the first water circulation channel and a first circulating water pump is arranged on the first water circulation loop; A control terminal configured to generate a first hot water storage tank set water temperature signal and a second hot water storage tank set water temperature signal; and The control circuit is configured to receive a reference temperature signal, a set water temperature signal of the first hot water storage tank, a set water temperature signal of the second hot water storage tank, a first water storage temperature signal, and a second water storage temperature signal, and generate a shutdown drive signal to the first circulating water pump to stop the first circulating water pump, so that the gas-phase refrigerant provided by the compressor passes through the first heat exchanger and exchanges heat with water in the second heat exchanger, and the water after heat exchange is stored in the second hot water storage tank.

9. The heat pump system according to claim 8, characterized in that: The control circuit is also configured to receive the reference temperature signal, the set water temperature signal of the first hot water storage tank, the set water temperature signal of the second hot water storage tank, the first water storage temperature signal, and the second water storage temperature signal, and generate a working drive signal to the first circulating water pump to keep the first circulating water pump running, so that the first heat exchanger can perform heat exchange between the refrigerant provided by the compressor that produces a phase change from gas phase to liquid phase and water; or can perform heat exchange between the gas phase refrigerant provided by the compressor and water.

10. The heat pump system according to claim 8 or 9, characterized in that: The first hot water storage tank is also provided with an auxiliary heating element; The control circuit is also configured to receive the first hot water tank set water temperature signal, the second hot water tank set water temperature signal, the first water storage temperature signal and the second water storage temperature signal, and generate an auxiliary heating element driving signal to the auxiliary heating element to drive the auxiliary heating element to operate.

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