Heat pump system

Abstract

The utility model relates to a heat pump system, and belongs to the technical field of heat pumps, the heat pump system comprises a plurality of indoor units, and each indoor unit comprises an indoor heat exchanger; the compressor is used for conveying a refrigerant to the indoor heat exchanger; the plate heat exchanger communicates with the indoor heat exchanger, and a refrigerant flows through the plate heat exchanger; the circulating branch connects the indoor heat exchanger with the plate heat exchanger; a water tank; the heat pump is used for changing the temperature of water in the water tank; the first circulating pipeline is communicated with the water tank; the first water pump is arranged on the first circulating pipeline, and the first water pump is used for providing power for water circulation in the first circulating pipeline; and each plate heat exchanger is connected with the first circulating pipeline in parallel, so that water flow in the first circulating pipeline recovers heat in each room while each room realizes simultaneous refrigeration and heating, and the overall energy efficiency of the system is improved.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and more particularly to a heat pump system. Background Technology

[0002] Currently, in central heating systems, indoor units typically use fan coil units, which deliver hot or cold water from a water tank to the fan coil units in each room to heat or cool the room.

[0003] In the existing technology, based on the above structural principle, the water in the tank can only be either all hot water or all cold water. Therefore, all rooms can only achieve heating or cooling at the same time, and it is impossible to achieve simultaneous heating and cooling.

[0004] During seasonal transitions, rooms in sunny locations may overheat and require cooling, while rooms in shaded areas may still need heating. Furthermore, different people may have varying temperature needs, leading to situations where both heating and cooling are required simultaneously. Therefore, current technologies cannot effectively integrate air conditioning and heating systems to meet user needs. Utility Model Content

[0005] This application addresses, to at least some extent, one of the technical problems in the related art.

[0006] Therefore, this application aims to provide a heat pump system that connects the indoor units in each room to the water tank in parallel by setting up a first circulation pipeline. Under the action of the first water pump, the water flow in the first circulation pipeline carries the heat in each room back to the water tank for recovery. This allows each room to simultaneously achieve both cooling and heating modes while recovering heat from each room, thereby improving the system's energy efficiency.

[0007] To achieve the above objectives, this application provides a heat pump system, comprising:

[0008] Multiple indoor units, including:

[0009] Indoor heat exchanger;

[0010] A compressor for supplying refrigerant to the indoor heat exchanger;

[0011] A plate heat exchanger, wherein the plate heat exchanger is connected to the indoor heat exchanger and a refrigerant flows through it;

[0012] A circulation branch connects the indoor heat exchanger to the plate heat exchanger.

[0013] Water tank, the water tank being used to hold water;

[0014] A heat pump, used to change the water temperature in the water tank;

[0015] The first circulation pipeline is connected to the water tank;

[0016] A first water pump is installed on the first circulation pipeline, and the first water pump is used to provide power for the circulation of water in the first circulation pipeline.

[0017] Each of the plate heat exchangers is connected in parallel with the first circulation pipeline.

[0018] In this technical solution, by connecting each plate heat exchanger in parallel with the first circulation pipeline, water from the tank can enter each plate heat exchanger through the first circulation pipeline under the action of the first water pump, thereby achieving heat exchange with the refrigerant. When the indoor unit is cooling, the refrigerant exchanges heat with the water flow in the plate heat exchanger through a four-way valve. The refrigerant releases heat, and the water becomes hot water. The heated water then returns to the tank through the first circulation pipeline, mixing with the water in the tank to achieve heat recovery. When the indoor unit is heating, the refrigerant exchanges heat with the water flow in the plate heat exchanger through a four-way valve. In this case, the refrigerant first passes through the indoor heat exchanger and the electronic expansion valve before entering the plate heat exchanger. Here, the refrigerant absorbs heat, and the water becomes cold water. The cooled water then returns to the tank through the first circulation pipeline, mixing with the water in the tank to achieve heat recovery, thus improving system energy efficiency.

[0019] In some embodiments of this application, multiple circulation branches are connected in parallel on the first circulation pipeline, and each circulation branch is connected to each of the plate heat exchangers.

[0020] In this technical solution, multiple circulation branches are set up so that water in the tank, under the action of the first water pump, enters each circulation branch through the first circulation pipeline, thereby achieving heat exchange in the corresponding plate heat exchangers, thus changing the refrigerant state and realizing either a refrigeration or heating cycle.

[0021] In some embodiments of this application, each of the circulation branches is provided with a valve, which is used to control the on / off state of the circulation branch.

[0022] In the technical solution, valves are installed so that staff can control the on / off of each circulation branch as needed. When the indoor unit in the room is not in use, the corresponding valve is closed to block water from flowing into the plate heat exchanger in the indoor unit, which facilitates subsequent work arrangements.

[0023] In some embodiments of this application, the heat pump includes:

[0024] A heat pump unit is used to cool or heat water sources.

[0025] The second circulation pipeline connects the heat pump unit and the water tank.

[0026] The second water pump is located on the second circulation pipeline and is used to provide power for the circulation of water in the second circulation pipeline.

[0027] In the technical solution, under the action of the second water pump, the heat pump main unit produces cold water or hot water, which enters the water tank through the second circulation pipeline, thereby changing the water temperature in the water tank.

[0028] In some embodiments of this application, the heat pump includes a coil located in the water tank and connected to the second circulation pipeline, the coil being used to increase the heat exchange area.

[0029] In the technical solution, by setting up coils, the contact area between the cold or hot water produced by the heat pump main unit and the water in the water tank is increased, thereby increasing the heat exchange rate and enabling the water temperature in the water tank to drop or rise rapidly to meet the usage requirements.

[0030] In some embodiments of this application, the indoor unit further includes a four-way valve for switching between cooling and heating modes.

[0031] In the technical solution, by setting a four-way valve, the refrigerant circulates through different paths in heating mode and cooling mode, thus realizing the separation of refrigerant heating cycle and cooling cycle.

[0032] In some embodiments of this application, the indoor unit further includes a gas-liquid separator disposed on a pipeline between the indoor heat exchanger and the compressor.

[0033] In the technical solution, a gas-liquid separator is installed to prevent liquid refrigerant from entering the compressor and causing liquid slugging.

[0034] In some embodiments of this application, the indoor unit further includes an electronic expansion valve, which is located on the pipeline between the indoor heat exchanger and the plate heat exchanger.

[0035] In the technical solution, an electronic expansion valve is installed to control the flow and pressure of the refrigerant, thereby changing the physical state of the refrigerant to facilitate heat absorption or release in the plate heat exchanger.

[0036] In some embodiments of this application, the indoor unit further includes a liquid receiver disposed on a pipeline between the electronic expansion valve and the plate heat exchanger.

[0037] In the technical solution, a liquid receiver is installed to store the subcooled liquid refrigerant in order to regulate the liquid supply to the evaporator.

[0038] In addition, this application also provides a heat pump system, which includes:

[0039] Multiple indoor units, including:

[0040] Indoor heat exchanger;

[0041] A compressor for supplying refrigerant to the indoor heat exchanger;

[0042] A plate heat exchanger, wherein the plate heat exchanger is connected to the indoor heat exchanger and a refrigerant flows through it;

[0043] A circulation branch connects the indoor heat exchanger to the plate heat exchanger.

[0044] Water tank, the water tank being used to hold water;

[0045] A heat pump, used to change the temperature of the water in the water tank;

[0046] The first circulation pipeline is connected to the water tank and to one of the plate heat exchangers.

[0047] A first water pump is installed on the first circulation pipeline, and the first water pump is used to provide power for the circulation of water in the first circulation pipeline.

[0048] A third circulation pipeline, wherein the third circulation pipeline is connected in parallel with the first circulation pipeline;

[0049] A fourth circulation pipeline is provided, which is connected in parallel with the third circulation pipeline. Multiple fourth circulation pipelines are provided, and each fourth circulation pipeline is connected to one of the plate heat exchangers.

[0050] The first circulation pipeline is connected in parallel with the fourth circulation pipeline. The first water pump provides power for the water flow to circulate in the fourth circulation pipeline, and heat exchange occurs in each of the plate heat exchangers.

[0051] In the technical solution, the first circulation pipeline and the fourth circulation pipeline are connected in parallel, and each plate heat exchanger is connected in parallel with the fourth circulation pipeline. Under the action of the first water pump, the water in the water tank can enter each fourth circulation pipeline through the first circulation pipeline and the third circulation pipeline, and flow through each plate heat exchanger through the first circulation pipeline and the fourth circulation pipeline to achieve heat exchange with the refrigerant in each indoor unit. When the indoor unit is cooling, the refrigerant exchanges heat with the water flow in the plate heat exchanger through the four-way valve. At this time, the refrigerant releases heat, and the water flow becomes hot water. The heated water flow returns to the water tank through the first circulation pipe and mixes with the water flow in the water tank to achieve heat recovery. When the indoor unit is heating, the refrigerant exchanges heat with the water flow in the plate heat exchanger through the four-way valve. At this time, the refrigerant first passes through the indoor heat exchanger and the electronic expansion valve before entering the plate heat exchanger. At this time, the refrigerant absorbs heat, and the water flow becomes cold water. The cooled water flow returns to the water tank through the first circulation pipe and mixes with the water flow in the water tank to achieve heat recovery, thereby improving the system energy efficiency.

[0052] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the overall structure of the indoor unit according to an embodiment of this application;

[0054] Figure 2 This is a schematic diagram of the overall structure of a heat pump system according to an embodiment of this application;

[0055] Figure 3 This is a schematic diagram of the structure of an indoor refrigeration cycle according to an embodiment of this application;

[0056] Figure 4 This is a heat pump logic judgment diagram for indoor cooling cycle according to the embodiments of this application;

[0057] Figure 5 This is a schematic diagram of the indoor mechanism heat cycle according to an embodiment of this application;

[0058] Figure 6 This is a heat pump logic judgment diagram for indoor mechanism heat cycle according to the embodiments of this application;

[0059] Figure 7 This is a schematic diagram of the structure of the indoor unit during cooling and heating according to the embodiments of this application;

[0060] Figure 8 This is a heat pump logic judgment diagram for indoor unit cooling and heating according to the embodiments of this application;

[0061] Figure 9This is a schematic diagram of the structure of an indoor refrigeration cycle according to an embodiment of this application;

[0062] Figure 10 This is a heat pump logic judgment diagram for indoor cooling cycle according to the embodiments of this application;

[0063] Figure 11 This is a schematic diagram of the indoor mechanism heat cycle according to an embodiment of this application;

[0064] Figure 12 This is a heat pump logic judgment diagram for indoor mechanism heat cycle according to the embodiments of this application;

[0065] Figure 13 This is a schematic diagram of the structure of the indoor unit during cooling and heating according to the embodiments of this application;

[0066] Figure 14 This is a heat pump logic decision diagram for indoor unit cooling and heating according to the embodiments of this application.

[0067] In the above diagrams: 100, Indoor unit; 101, Compressor; 102, Four-way valve; 103, Indoor heat exchanger; 104, Plate heat exchanger; 105, Electronic expansion valve; 106, Indoor fan; 107, Gas-liquid separator; 108, Circulation branch; 200, Water tank; 201, First temperature sensor Tdhw; 202, Outlet water temperature sensor TOW; 203, Return water temperature sensor TRW; 300, Heat pump; 400, First circulation pipeline; 401, First outlet water pipeline; 402, First return water pipeline; 500, First water pump; 600, Circulation branch; 700, Heat pump main unit; 800, Second circulation pipeline; 801, Coil; 900, Second water pump. Detailed Implementation

[0068] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0069] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0070] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0071] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0073] In this application, the heat pump system includes multiple indoor units, a water tank, a heat pump, a first circulation pipeline, and a first water pump. The heat pump is used to change the temperature of the water in the water tank. Each indoor unit is installed in a room, and users can adjust the cooling or heating mode according to their needs, so that the indoor unit can perform cooling or heating circulation. By setting up the first circulation pipeline, multiple indoor units and the water tank can be connected in parallel, so that the water in the water tank can exchange heat with all the working indoor units at the same time through the first circulation pipeline, realizing simultaneous cooling and heating in different rooms. At the same time, the heat pump system in this application does not require fan coil units, so it can directly replace the original fan coil units and be integrated into the existing heating pipeline, reducing costs and facilitating installation.

[0074] In the following, embodiments of this application will be described in detail with reference to the accompanying drawings.

[0075] In one illustrative embodiment of the heat pump system of this application, reference is made to... Figure 1 The heat pump system includes multiple indoor units 100, each indoor unit 100 including a compressor 101, which delivers refrigerant to an indoor heat exchanger 103 to drive refrigerant circulation.

[0076] In some embodiments, the indoor unit 100 includes a four-way valve for switching the refrigerant flow direction to achieve the switching between cooling mode and heating mode.

[0077] In some embodiments, the indoor unit 100 includes an indoor heat exchanger 103. When refrigerant passes through the indoor heat exchanger 103, the refrigerant evaporates and absorbs heat or condenses and releases heat, thereby changing the state of the refrigerant. When the refrigerant in the indoor heat exchanger 103 evaporates and absorbs heat, the indoor heat exchanger 103 acts as an evaporator, and the indoor unit 100 performs cooling; when the refrigerant in the indoor heat exchanger 103 condenses and releases heat, the indoor heat exchanger 103 acts as a condenser, and the indoor unit 100 performs heating.

[0078] In some embodiments, the indoor unit 100 includes a plate heat exchanger 104. When refrigerant enters the plate heat exchanger 104, the refrigerant evaporates and absorbs heat or condenses and releases heat. The plate heat exchanger 104 works on the same principle as the indoor heat exchanger 103, and the refrigerant's working state in the plate heat exchanger 104 is opposite to that in the indoor heat exchanger 103. When the indoor heat exchanger 103 acts as an evaporator, the plate heat exchanger 104 acts as a condenser; when the indoor heat exchanger 103 acts as a condenser, the plate heat exchanger 104 acts as an evaporator.

[0079] In some embodiments, the indoor unit 100 includes an electronic expansion valve 105 located on the pipeline between the indoor heat exchanger 103 and the plate heat exchanger 104. The electronic expansion valve 105 is used to control the flow rate and pressure of the refrigerant to change the physical state of the refrigerant, so as to cooperate with the refrigerant to absorb or release heat in the plate heat exchanger 104, thereby realizing the circulation of the refrigerant in the indoor unit 100.

[0080] In some embodiments, the indoor unit 100 includes an indoor fan 106, which is located on one side of the indoor heat exchanger 103. When the indoor heat exchanger 103 acts as an evaporator, the indoor fan 106 blows out cold air to cool the indoor environment; when the indoor heat exchanger 103 acts as a condenser, the indoor fan 106 blows out hot air to heat the indoor environment.

[0081] In some embodiments, the indoor unit 100 includes a gas-liquid separator 107 located on a pipeline between the indoor heat exchanger 103 and the compressor 101. The gas-liquid separator 107 is used to prevent liquid refrigerant from entering the compressor 101 and causing liquid slugging in the compressor 101.

[0082] In some embodiments, the indoor unit 100 includes a liquid receiver located on a pipeline between the electronic expansion valve 105 and the plate heat exchanger 104. The liquid receiver is used to store subcooled liquid refrigerant and regulate the liquid supply of the evaporator.

[0083] In some embodiments, the indoor unit 100 includes a circulation branch 108, which connects the compressor 101, a four-way valve, an indoor heat exchanger 103, a plate heat exchanger 104, an electronic expansion valve 105, a gas-liquid separator 107, and a liquid receiver. The circulation branch 108 is used for the circulation of refrigerant.

[0084] Through the above technical solution, in the cooling mode, the compressor 101, four-way valve, plate heat exchanger 104, liquid receiver, electronic expansion valve 105, indoor heat exchanger 103, four-way valve, gas-liquid separator 107, and compressor 101 are connected in sequence to form a refrigeration cycle loop. At this time, the four-way valve does not work. The refrigerant compressed by the compressor 101 passes through the four-way valve and exchanges heat with the water flow in the plate heat exchanger 104, turning the water flow into hot water. After releasing heat, the refrigerant passes through the electronic expansion valve 105 and evaporates and absorbs heat in the indoor heat exchanger 103. The indoor fan 106 blows out cold air, realizing the cooling of the indoor space. The refrigerant then passes through the four-way valve and gas-liquid separator 107 back to the compressor 101, and so on.

[0085] In heating mode, compressor 101, four-way valve, indoor heat exchanger 103, electronic expansion valve 105, liquid receiver, plate heat exchanger 104, four-way valve, gas-liquid separator 107, and compressor 101 are connected in sequence to form a heating cycle loop. At this time, the four-way valve is activated, causing the refrigerant compressed by compressor 101 to change its flow direction after passing through the four-way valve. It first passes through indoor heat exchanger 103 and condenses and releases heat in indoor heat exchanger 103. Indoor fan 106 blows out hot air to heat the indoor space. The refrigerant then passes through electronic expansion valve 105 and evaporates and absorbs heat in plate heat exchanger 104, turning the water flow into cold water. It then passes through four-way valve and gas-liquid separator 107 and returns to compressor 101, thus completing the cycle.

[0086] In some embodiments, refer to Figure 1 and Figure 2 The heat pump system includes a water tank 200, which is used to contain water flow.

[0087] In some embodiments, the heat pump system includes a heat pump 300, which is used to change the temperature of the water flow in the water tank 200.

[0088] In existing technologies, heat pump systems often employ air-source heat pump 300 units with underfloor heating and fan coil units. During winter heating, the heating mode is activated, and the fan coil units are shut down, utilizing the underfloor heating coils for radiant heating. During summer cooling, the cooling mode is activated, the underfloor heating coils are shut down, and the fan coil units are activated, delivering hot or cold water from the water tank 200 to the fan coil units in each room to achieve cooling or heating. In this configuration, the heat pump system can only simultaneously cool or heat all rooms, failing to tailor cooling and heating to the specific needs of each user in each room. This results in a poor user experience and the inability to recover heat, leading to low overall energy efficiency.

[0089] Based on this, a heat pump system is provided in this application so that the indoor units 100 in different rooms can simultaneously perform cooling and heating work according to the user's needs in each room, thereby meeting the user's needs.

[0090] In some embodiments, the heat pump system includes a first circulation pipe 400, which is connected to a water tank 200 and is connected in parallel with each plate heat exchanger 104. The first circulation pipe 400 is used to supply water to each plate heat exchanger 104 for heat exchange of the refrigerant, so as to realize the change of the refrigerant state.

[0091] In some embodiments, the heat pump system includes a first water pump 500, which is disposed on a first circulation pipe 400 and is used to provide power for the circulation of water in the first circulation pipe 400.

[0092] Through the above technical solution, by connecting each plate heat exchanger 104 in parallel with the first circulation pipeline 400, under the action of the first water pump 500, the water in the water tank 200 can pass through the first circulation pipeline 400 and into each plate heat exchanger 104 to exchange heat with the refrigerant in each indoor unit 100. When the indoor unit 100 is cooling, the refrigerant exchanges heat with the water in the plate heat exchanger 104 through the four-way valve. At this time, the refrigerant releases heat, and the water becomes hot water. The heated water returns to the water tank 200 through the first circulation pipe 400 and mixes with the water in the water tank 200 to achieve heat recovery. When the indoor unit 100 is heating, the refrigerant exchanges heat with the water in the plate heat exchanger 104 through the four-way valve. At this time, the refrigerant first passes through the indoor heat exchanger 103 and the electronic expansion valve 105 before entering the plate heat exchanger 104. At this time, the refrigerant absorbs heat, and the water becomes cold water. The cooled water returns to the water tank 200 through the first circulation pipe 400 and mixes with the water in the water tank 200 to achieve heat recovery, thereby improving the system energy efficiency.

[0093] In some embodiments, refer to Figure 2 and Figure 3 The first circulation pipeline 400 includes a first outlet pipeline 401, and a first water pump 500 is located on the first outlet pipeline 401. Water in the water tank 200 enters the first outlet pipeline 401 from the water tank 200 under the action of the first water pump 500, and flows from the first outlet pipeline 401 to each plate heat exchanger 104. Water, as a heat transfer medium, exchanges heat with the refrigerant in the plate heat exchanger 104, thereby changing the state of the refrigerant to achieve a refrigeration cycle or a heating cycle of the refrigerant.

[0094] In some embodiments, the first circulation pipe 400 includes a first return water pipe 402. One end of the first return water pipe 402 is connected to the first outlet water pipe 401 to form a passage, and the other end of the first return water pipe 402 is connected to the water tank 200. Water circulates in the water tank 200 and the first circulation pipe 402 under the action of the first water pump 500, so that the water can continuously absorb and carry away the heat transferred by the refrigerant in the plate heat exchanger 104, so that the refrigerant can be circulated and used in the indoor unit 100.

[0095] In some embodiments, multiple circulation branches 600 are connected in parallel to the first circulation pipeline 400, and each circulation branch 600 is connected to each plate heat exchanger 104. In use, under the action of the first water pump 500, water enters the first outlet pipeline 401 from the water tank 200, and then enters each circulation branch 600 from the first outlet pipeline 401. The water in each circulation branch 600 exchanges heat with the refrigerant in the corresponding plate heat exchanger 104. After heat exchange, the water flows out of the plate heat exchanger 104 through the circulation branch 600, collects in the first return water pipeline 402, and finally returns to the water tank 200 from the first return water pipeline 402 to mix with the water in the water tank 200, thereby realizing heat recovery.

[0096] In some embodiments, each circulation branch 600 is equipped with a valve to control the on / off state of the circulation branch 600. When the indoor unit 100 in the room malfunctions and requires isolation for maintenance, or when the room is used for other purposes and air conditioning is not needed, the operator closes the valve on the circulation branch 600 corresponding to the indoor unit 100 in that room, blocking water from flowing into the plate heat exchanger 104 in that indoor unit 100, stopping the operation of the indoor unit 100 in that room, and facilitating subsequent work arrangements.

[0097] In some embodiments, the heat pump 300 includes a heat pump host 700, in which refrigerant circulates, enabling the heat pump host 700 to cool or heat a water source.

[0098] In some embodiments, the heat pump 300 includes a second circulation pipe 800 located between the heat pump host 700 and the water tank 200. The second circulation pipe 800 is used to transfer hot or cold water generated by the heat pump host 700 to the water tank 200 to achieve a change in the water temperature inside the water tank 200.

[0099] In some embodiments, the heat pump 300 includes a second water pump 900 disposed on a second circulation pipe 800. The second water pump 900 is used to provide power for the circulation of water in the second circulation pipe 800, so that the water heated or cooled by the heat pump host 700 enters the water tank 200, thereby changing the water temperature in the water tank 200.

[0100] In some embodiments, the heat pump 300 includes a coil 801 located in the water tank 200 and connected to the second circulation pipe 800. The coil 801 is used to increase the contact area between the cold or hot water produced by the heat pump host 700 and the water in the water tank 200, thereby increasing the heat exchange rate and enabling the temperature of the water in the water tank 200 to drop or rise rapidly to meet usage requirements.

[0101] In some embodiments, since the cooling and heating operations of each indoor unit 100 are different, the water returning from the first return water pipe 402 to the water tank 200 may be cold water, hot water, or a combination of cold and hot water. Therefore, in order to reduce heat loss, the water temperature in the water tank 200 needs to be maintained between 20°C and 30°C.

[0102] In some embodiments, in order to facilitate monitoring of the water temperature in the water tank 200, a first temperature sensor Tdhw (Domestic Hot Water Temperature) 201 is provided in the water tank 200. The first temperature sensor Tdhw 201 is used to monitor the water temperature in the water tank 200 and obtain the real-time temperature value.

[0103] In some embodiments, the first and second temperature preset values ​​are set by the user, distributed from the cloud, or preset at the factory.

[0104] In some embodiments, the first temperature preset value can be 30°C.

[0105] In some embodiments, the second temperature preset value can be 20°C.

[0106] In some embodiments, refer to Figure 3 and Figure 4 The heat pump system also includes a controller, which is configured to: when all indoor units 100 are cooling, control the first temperature sensor Tdhw201 to detect the water temperature in the water tank 200 and obtain the real-time temperature value; when the temperature value is higher than the first preset temperature value, control the heat pump host 700 to cool the water tank 200, so that the temperature in the water tank 200 drops to the second preset temperature value.

[0107] In the technical solution, when all indoor units 100 are cooling, the water in the circulation branch 600 becomes hot water after exchanging heat with the refrigerant in the plate heat exchanger 104. The hot water returning in the first return water pipe 402 is mixed with the water in the water tank 200. The controller determines whether the heat pump host 700 needs to cool the water in the water tank 200. If so, under the action of the second water pump 900, cold water enters the water tank 200 through the second circulation pipe 800. The cold water mixes with the hot water in the water tank 200, causing the water temperature in the water tank 200 to drop to the second preset temperature value.

[0108] In some embodiments, refer to Figure 5 and Figure 6 The controller is configured to: when all indoor units 100 are heating, control the first temperature sensor Tdhw201 to detect the water temperature in the water tank 200 and obtain the real-time temperature value; when the temperature is lower than the second preset temperature value, control the heat pump host 700 to heat the water tank 200 so that the temperature in the water tank 200 rises to the first preset temperature value.

[0109] In the technical solution, when the indoor unit 100 is heating, the water in the circulation branch 600 becomes cold water after exchanging heat with the refrigerant in the plate heat exchanger 104. The cold water returning in the first return water pipe 402 is mixed with the water in the water tank 200. The controller determines whether the heat pump host 700 needs to heat the water in the water tank 200. If so, under the action of the second water pump 900, hot water enters the water tank 200 through the second circulation pipe 800. The hot water mixes with the cold water in the water tank 200, so that the water in the water tank 200 is heated to the first preset temperature value.

[0110] In some embodiments, refer to Figure 7 and Figure 8 When indoor units 100 in different rooms are simultaneously cooling and heating, the first temperature sensor Tdhw201 is controlled to detect the water temperature in the water tank 200 and obtain the real-time temperature value. When the temperature value is higher than the first preset temperature value, the heat pump host 700 is controlled to cool the water tank 200. When the temperature is lower than the second preset temperature value, the heat pump host 700 is controlled to heat the water tank 200.

[0111] In the technical solution, when indoor units 100 in different rooms are simultaneously operating in cooling and heating modes, the water returned from the corresponding circulation branch 600 of the indoor unit 100 operating in cooling mode is hot water, and the water returned from the corresponding circulation branch 600 of the indoor unit 100 operating in heating mode is cold water. The water returned from each circulation branch 600 is collected in the first return water pipe 402, mixed, and then flows into the water tank 200 to mix with the water in the water tank 200. The controller determines whether the heat pump host 700 needs to heat or cool the water in the water tank 200. If the controller determines that cooling is required, the heat pump unit 700 performs cooling. Under the action of the second water pump 900, cold water enters the water tank 200 and mixes with the water in the water tank 200 at that time, cooling the water in the water tank 200 to the second preset temperature value. If the controller determines that heating is required, the heat pump unit 700 performs heating. Under the action of the second water pump 900, hot water enters the water tank 200 and mixes with the water in the water tank 200 at that time, heating the water in the water tank 200 to the first preset temperature value.

[0112] Through the above technical solution, when all indoor units 100 are cooling, although the return water temperature of the first return water pipe 402 increases, the overall water temperature rise after mixing with the water in the water tank 200 is less than the return water temperature rise, thus reducing the work done by the heat pump 300 and improving the overall system energy efficiency. When all indoor units 100 are heating, although the return water temperature of the first return water pipe 402 is lower, the overall water temperature drop after mixing with the water in the water tank 200 is less than the return water temperature drop, thus reducing the work done by the heat pump 300 and improving the overall system energy efficiency. Overall energy efficiency: When the indoor unit 100 is cooling and heating simultaneously, the return water in the circulation branch 600 contains both hot and cold water. After mixing in the first return water pipe 402, the temperature of the return water achieves initial equilibrium. After entering the water tank 200 from the first return water pipe 402, the return water mixes again with the water in the water tank 200 to achieve further temperature equilibrium, thereby realizing heat transfer between different rooms and realizing heat recovery function. At this time, the work done by the heat pump 300 is reduced, thereby improving the energy efficiency of the entire system.

[0113] In some embodiments, refer to Figure 9 and Figure 10 A water temperature sensor TOW (Temperature of Outlet Water) 202 is installed in the first water outlet pipe 401. The water temperature sensor TOW 202 is located at the end of the first water outlet pipe 401 near the water tank 200. The water temperature sensor TOW 202 is used to monitor the temperature of the water flowing out of the water tank 200 and obtain the real-time temperature value.

[0114] In some embodiments, a return water temperature sensor TRW (Temperature Return Water) 203 is provided in the first return water pipe 402. The return water temperature sensor TRW 203 is located at the end of the first return water pipe 402 near the water tank 200. The return water temperature sensor TRW 203 is used to monitor the temperature of water entering the water tank 200 from the first return water pipe 402 and obtain the real-time temperature value.

[0115] In some embodiments, the third and fourth temperature preset values ​​are set by the user, distributed from the cloud, or preset by the factory.

[0116] In some embodiments, the third temperature preset value can be 27°C.

[0117] In some embodiments, the fourth temperature preset value can be 23°C.

[0118] In some embodiments, refer to Figure 9 and Figure 10The controller is configured as follows: when all indoor units 100 are cooling, the first temperature sensor Tdhw201 is controlled to detect the water temperature in the water tank 200 and obtain the real-time temperature value. It is then determined whether the temperature is higher than the first preset temperature value. If so, the heat pump host 700 is controlled to cool the water in the water tank 200, reducing the temperature in the water tank 200 to the second preset temperature value. If not, it is determined whether the temperature is higher than the third preset temperature value and whether the return water temperature sensor TRW203 and the outlet water temperature sensor TOW202 detect that the difference between the return water temperature and the outlet water temperature is greater than 7°C. If so, the heat pump host 700 is cooled, reducing the water temperature in the water tank 200 to the second preset temperature value. If not, the heat pump host 700 stops operating.

[0119] In the technical solution, when all indoor units 100 are cooling, the water returned from each circulation branch 600 is all hot water. The hot water is collected from the first return water pipe 402 and enters the water tank 200 to mix with the water in the water tank 200. The controller determines whether the heat pump host 700 needs to cool the water in the water tank 200.

[0120] In some embodiments, refer to Figure 11 and Figure 12 The controller is configured as follows: when all indoor units 100 are heating, the controller controls the first temperature sensor Tdhw201 to detect the water temperature in the water tank 200 and obtain the real-time temperature value. It then determines whether the temperature is lower than the second preset temperature value. If so, the controller controls the heat pump host 700 to heat the water in the water tank 200 to raise the water temperature to the first preset temperature value. If not, the controller determines whether the temperature is lower than the fourth preset temperature value and whether the outlet water temperature sensor TOW202 and the return water temperature sensor TRW203 detect that the difference between the return water temperature and the outlet water temperature is greater than 7°C. If so, the heat pump host 700 heats the water in the water tank 200 to the first preset temperature value. If not, the heat pump host 700 stops operating.

[0121] In the technical solution, when all indoor units 100 are heating, the water returned from each circulation branch 600 is all cold water. The cold water is collected from the first return water pipe 402 and enters the water tank 200 to mix with the water in the water tank 200. The controller determines whether the heat pump host 700 needs to heat the water in the water tank 200.

[0122] In some embodiments, refer to Figure 13 and Figure 14 The controller is configured to: when indoor units 100 in different rooms are simultaneously cooling and heating, control the first temperature sensor Tdhw201 to detect the water temperature in the water tank 200, obtain the real-time temperature value, and make a judgment on the temperature.

[0123] If the temperature value is higher than the first preset temperature value, the heat pump host 700 is controlled to cool the water tank 200; otherwise, it is determined whether the temperature is higher than the third preset temperature value and whether the return water temperature sensor TRW203 and the outlet water temperature sensor TOW202 detect that the difference between the return water temperature and the outlet water temperature is greater than 7°C. If so, the heat pump host 700 cools the water in the water tank 200 to the second preset temperature value; otherwise, the heat pump host 700 stops operating.

[0124] If the temperature is lower than the second preset temperature value, the heat pump host 700 is controlled to heat the water tank 200; otherwise, it is determined whether the temperature is lower than the fourth preset temperature value and whether the outlet water temperature sensor TOW202 and the return water temperature sensor TRW203 detect that the difference between the return water temperature and the outlet water temperature is greater than 7°C. If so, the heat pump host 700 heats the water in the water tank 200 to the first preset temperature value; otherwise, the heat pump host 700 stops operating.

[0125] In the above technical solution, when indoor units 100 in different rooms are simultaneously operating in cooling and heating modes, the hot water returning from the cooling room circulation branch 600 and the cold water returning from the heating room circulation branch 600 are mixed in the first return water pipe 402, thereby achieving heat transfer between different rooms. The mixed water in the first return water pipe 402 enters the water tank 200 and is further mixed with the water in the water tank 200 to achieve heat recovery. This results in a smaller temperature fluctuation in the water tank 200, thereby reducing the work done by the heat pump 300 and improving the energy efficiency of the entire system.

[0126] In addition, this application also provides a heat pump system, which includes a plurality of indoor units 100, each indoor unit 100 including a compressor 101, the compressor 101 being used to deliver refrigerant to an indoor heat exchanger 103 and drive refrigerant circulation.

[0127] In some embodiments, the indoor unit 100 includes a four-way valve for switching the refrigerant flow direction to achieve the switching between cooling mode and heating mode.

[0128] In some embodiments, the indoor unit 100 includes an indoor heat exchanger 103. When refrigerant passes through the indoor heat exchanger 103, the refrigerant evaporates and absorbs heat or condenses and releases heat, thereby changing the state of the refrigerant. When the refrigerant in the indoor heat exchanger 103 evaporates and absorbs heat, the indoor heat exchanger 103 acts as an evaporator, and the indoor unit 100 performs cooling; when the refrigerant in the indoor heat exchanger 103 condenses and releases heat, the indoor heat exchanger 103 acts as a condenser, and the indoor unit 100 performs heating.

[0129] In some embodiments, the indoor unit 100 includes a plate heat exchanger 104. When refrigerant enters the plate heat exchanger 104, the refrigerant evaporates and absorbs heat or condenses and releases heat. The plate heat exchanger 104 works on the same principle as the indoor heat exchanger 103, and the refrigerant's working state in the plate heat exchanger 104 is opposite to that in the indoor heat exchanger 103. When the indoor heat exchanger 103 acts as an evaporator, the plate heat exchanger 104 acts as a condenser; when the indoor heat exchanger 103 acts as a condenser, the plate heat exchanger 104 acts as an evaporator.

[0130] In some embodiments, the indoor unit 100 includes an electronic expansion valve 105 located on the pipeline between the indoor heat exchanger 103 and the plate heat exchanger 104. The electronic expansion valve 105 is used to control the flow rate and pressure of the refrigerant to change the physical state of the refrigerant, so as to cooperate with the refrigerant to absorb or release heat in the plate heat exchanger 104, thereby realizing the circulation of the refrigerant in the indoor unit 100.

[0131] In some embodiments, the indoor unit 100 includes an indoor fan 106, which is located on one side of the indoor heat exchanger 103. When the indoor heat exchanger 103 acts as an evaporator, the indoor fan 106 blows out cold air to cool the indoor environment; when the indoor heat exchanger 103 acts as a condenser, the indoor fan 106 blows out hot air to heat the indoor environment.

[0132] In some embodiments, the indoor unit 100 includes a gas-liquid separator 107 located on a pipeline between the indoor heat exchanger 103 and the compressor 101. The gas-liquid separator 107 is used to prevent liquid refrigerant from entering the compressor 101 and causing liquid slugging in the compressor 101.

[0133] In some embodiments, the indoor unit 100 includes a liquid receiver located on a pipeline between the electronic expansion valve 105 and the plate heat exchanger 104. The liquid receiver is used to store subcooled liquid refrigerant and regulate the liquid supply of the evaporator.

[0134] In some embodiments, the indoor unit 100 includes a circulation branch 108, which connects the compressor 101, a four-way valve, an indoor heat exchanger 103, a plate heat exchanger 104, an electronic expansion valve 105, a gas-liquid separator 107, and a liquid receiver. The circulation branch 108 is used for the circulation of refrigerant.

[0135] Through the above technical solution, in the cooling mode, the compressor 101, four-way valve, plate heat exchanger 104, liquid receiver, electronic expansion valve 105, indoor heat exchanger 103, four-way valve, gas-liquid separator 107, and compressor 101 are connected in sequence to form a refrigeration cycle loop. At this time, the four-way valve does not work. The refrigerant compressed by the compressor 101 passes through the four-way valve and exchanges heat with the water flow in the plate heat exchanger 104, turning the water flow into hot water. After releasing heat, the refrigerant passes through the electronic expansion valve 105 and evaporates and absorbs heat in the indoor heat exchanger 103. The indoor fan 106 blows out cold air, realizing the cooling of the indoor space. The refrigerant then passes through the four-way valve and gas-liquid separator 107 back to the compressor 101, and so on.

[0136] In heating mode, compressor 101, four-way valve, indoor heat exchanger 103, electronic expansion valve 105, liquid receiver, plate heat exchanger 104, four-way valve, gas-liquid separator 107, and compressor 101 are connected in sequence to form a heating cycle loop. At this time, the four-way valve is activated, causing the refrigerant compressed by compressor 101 to change its flow direction after passing through the four-way valve. It first passes through indoor heat exchanger 103 and condenses and releases heat in indoor heat exchanger 103. Indoor fan 106 blows out hot air to heat the indoor space. The refrigerant then passes through electronic expansion valve 105 and evaporates and absorbs heat in plate heat exchanger 104, turning the water flow into cold water. It then passes through four-way valve and gas-liquid separator 107 and returns to compressor 101, thus completing the cycle.

[0137] In some embodiments, the heat pump system includes a water tank 200 for containing water flow.

[0138] In some embodiments, the heat pump system includes a heat pump 300, which is used to change the temperature of the water flow in the water tank 200.

[0139] In some embodiments, the heat pump system includes a first circulation pipe 400 connected to a water tank 200 and connected to one of the plate heat exchangers 104.

[0140] In some embodiments, the heat pump system includes a third circulation line, which is connected in parallel with the first circulation line 400 and serves as an intermediate connection channel between the first circulation line 400 and each plate heat exchanger 104.

[0141] In some embodiments, the heat pump system includes a fourth circulation pipeline connected in parallel with the third circulation pipeline. Multiple fourth circulation pipelines are provided, and each fourth circulation pipeline is connected to a plate heat exchanger 104. The fourth circulation pipeline is used to supply water to each plate heat exchanger 104 for heat exchange of the refrigerant, so as to realize the change of the refrigerant state.

[0142] In some embodiments, the heat pump system includes a first water pump 500, which is disposed on a first circulation pipe 400 and is used to provide power for water circulation.

[0143] Through the above technical solution, the first circulation pipe 400 is connected in parallel with the fourth circulation pipe, and each plate heat exchanger 104 is connected in parallel with the fourth circulation pipe. Under the action of the first water pump 500, the water in the water tank 200 can enter each fourth circulation pipe through the first circulation pipe 400 and the third circulation pipe. The water then flows through each plate heat exchanger 104 through the first circulation pipe 400 and the fourth circulation pipe, thereby achieving heat exchange with the refrigerant in each indoor unit 100. When the indoor unit 100 is cooling, the refrigerant exchanges heat with the water flow in the plate heat exchanger 104 through the four-way valve. At this time, the refrigerant releases heat, and the water flow becomes hot water. The heated water flow returns to the water tank 200 through the first circulation pipe 400, where it mixes with the water flow in the water tank 200 to achieve heat recovery. When the indoor unit 100 is heating, the refrigerant exchanges heat with the water flow in the plate heat exchanger 104 through the four-way valve. At this time, the refrigerant first passes through the indoor heat exchanger 103 and the electronic expansion valve 105 before entering the plate heat exchanger 104. At this time, the refrigerant absorbs heat, and the water flow becomes cold water. The cooled water flow returns to the water tank 200 through the first circulation pipe 400, where it mixes with the water flow in the water tank 200 to achieve heat recovery, thereby improving the system energy efficiency.

[0144] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A heat pump system, characterized in that, It includes: Multiple indoor units, including: Indoor heat exchanger; A compressor for supplying refrigerant to the indoor heat exchanger; A plate heat exchanger, wherein the plate heat exchanger is connected to the indoor heat exchanger and a refrigerant flows through it; A circulation branch connects the indoor heat exchanger to the plate heat exchanger. Water tank, the water tank being used to hold water; A heat pump, used to change the water temperature in the water tank; The first circulation pipeline is connected to the water tank; A first water pump is installed on the first circulation pipeline, and the first water pump is used to provide power for the circulation of water in the first circulation pipeline. Each of the plate heat exchangers is connected in parallel with the first circulation pipeline.

2. The heat pump system according to claim 1, characterized in that, The first circulation pipeline has multiple circulation branches connected in parallel, and each circulation branch is connected to each of the plate heat exchangers.

3. The heat pump system according to claim 2, characterized in that, Each of the circulation branches is equipped with a valve, which is used to control the on / off state of the circulation branch.

4. The heat pump system according to claim 1, characterized in that, The heat pump includes: A heat pump unit is used to cool or heat water sources. The second circulation pipeline connects the heat pump unit and the water tank. The second water pump is located on the second circulation pipeline and is used to provide power for the circulation of water in the second circulation pipeline.

5. The heat pump system according to claim 4, characterized in that, The heat pump includes a coil located in the water tank and connected to the second circulation pipeline. The coil is used to increase the heat exchange area.

6. The heat pump system according to claim 1, characterized in that, The indoor unit also includes a four-way valve, which is used to switch between cooling mode and heating mode.

7. The heat pump system according to claim 1, characterized in that, The indoor unit also includes a gas-liquid separator, which is located on the pipeline between the indoor heat exchanger and the compressor.

8. The heat pump system according to claim 1, characterized in that, The indoor unit also includes an electronic expansion valve, which is located on the pipeline between the indoor heat exchanger and the plate heat exchanger.

9. The heat pump system according to claim 8, characterized in that, The indoor unit also includes a liquid receiver, which is located on the pipeline between the electronic expansion valve and the plate heat exchanger.

10. A heat pump system, characterized in that, It includes: Multiple indoor units, including: Indoor heat exchanger; A compressor for supplying refrigerant to the indoor heat exchanger; A plate heat exchanger, wherein the plate heat exchanger is connected to the indoor heat exchanger and a refrigerant flows through it; A circulation branch connects the indoor heat exchanger to the plate heat exchanger. Water tank, the water tank being used to hold water; A heat pump, used to change the temperature of the water in the water tank; The first circulation pipeline is connected to the water tank and to one of the plate heat exchangers. A first water pump is installed on the first circulation pipeline, and the first water pump is used to provide power for the circulation of water in the first circulation pipeline. A third circulation pipeline, wherein the third circulation pipeline is connected in parallel with the first circulation pipeline; A fourth circulation pipeline is provided, which is connected in parallel with the third circulation pipeline. Multiple fourth circulation pipelines are provided, and each fourth circulation pipeline is connected to one of the plate heat exchangers. The first circulation pipeline is connected in parallel with the fourth circulation pipeline, the first water pump provides power for the water flow to circulate in the fourth circulation pipeline, and heat exchange occurs in each of the plate heat exchangers.

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