Heat pump system

Abstract

This application relates to a heat pump system, belonging to the field of air conditioning technology. The heat pump system includes components such as a compressor, a first four-way valve, a second four-way valve, an outdoor heat exchanger, plate heat exchangers connected in series, an expansion valve, and indoor heat exchangers connected in parallel. The refrigerant flow direction is switched via the first and second four-way valves. In heating mode, the high-temperature refrigerant flows directly through the first plate heat exchanger to heat the water circuit, achieving efficient heating. In cooling mode, the refrigerant dissipates heat through the outdoor heat exchanger and then is throttled and cooled by the expansion valve, before being cooled by the second plate heat exchanger to achieve cooling. The controller automatically selects the operating mode and dynamically adjusts the water flow direction based on a real-time comparison of heating and cooling demand values. Innovatively, through valve group and water pump control, some indoor heat exchangers can simultaneously and independently heat or cool, achieving multi-mode coordinated operation without the need for additional piping. This significantly improves energy efficiency and system flexibility, solving the problems of complex installation and low energy efficiency in existing technologies.

Description

Technical Field

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

[0002] A heat pump system is a highly efficient and energy-saving air conditioning technology. It uses refrigerant to heat or cool water, which then flows into the corresponding indoor heat exchanger to regulate the indoor temperature.

[0003] Existing heat pump systems typically include an outdoor heat exchanger, a compressor, a plate heat exchanger, a water tank, an indoor heat exchanger, and a water pump. In heating mode, the compressor supplies high-temperature refrigerant to the plate heat exchanger, which heats the water in the tank. The refrigerant then returns to the compressor via the outdoor heat exchanger, completing the cycle. The water pump delivers the heated water from the tank to the indoor heat exchanger, where it exchanges heat with the indoor air to raise the indoor temperature. In cooling mode, the compressor supplies refrigerant to the outdoor heat exchanger, where it is cooled and flows to the plate heat exchanger, where it cools the water in the tank. The refrigerant then returns to the compressor, completing the cycle. The water pump delivers the cooled water from the tank to the indoor heat exchanger, where it exchanges heat with the indoor air to lower the indoor temperature.

[0004] However, existing heat pump systems require three-tube machines to simultaneously provide heating and cooling, which are complex to install and have low energy efficiency. Summary of the Invention

[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 capable of adjusting the temperature of the first plate heat exchanger to be higher or the temperature of the second plate heat exchanger to be lower, based on the demand for heating or cooling, to better meet the user's needs and improve system efficiency. Furthermore, it achieves the effect of partial heating and partial cooling of the indoor heat exchangers without requiring additional piping.

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

[0008] compressor;

[0009] A first four-way valve, comprising a first port, a second port, a third port, and a fourth port; the first port is connected to the output end of the compressor; the third port is connected to the input end of the compressor.

[0010] The second four-way valve includes a fifth port, a sixth port, a seventh port, and an eighth port; the second port is connected to the fifth port.

[0011] An outdoor heat exchanger, wherein both ends of the outdoor heat exchanger are respectively connected to the fourth interface and the seventh interface;

[0012] A heat exchange pipeline, the two ends of which are respectively connected to the sixth interface and the eighth interface;

[0013] The first plate heat exchanger and the second plate heat exchanger are connected in series in the heat exchange pipeline.

[0014] The second expansion valve is disposed between the output end of the first plate heat exchanger and the input end of the second plate heat exchanger.

[0015] The water circuit is connected to the first plate heat exchanger and the second plate heat exchanger, and the heat exchange between the refrigerant in the heat exchange pipeline and the water in the water circuit is realized through the first plate heat exchanger and the second plate heat exchanger.

[0016] Multiple indoor heat exchangers are connected in parallel with the water circuit.

[0017] In this technical solution, two four-way valves are used to enable flexible switching between heating and cooling modes in the heat pump system. The interface connection method of the first and second four-way valves allows the refrigerant flow direction to be changed as needed. When heating demand is high, the first and second four-way valves are controlled so that the high-temperature refrigerant output from the compressor bypasses the outdoor heat exchanger and flows directly through the first plate heat exchanger, primarily increasing its temperature. When the indoor heat exchanger is heating, it uses the hot water from the first plate heat exchanger for heating. When cooling demand is high, the first and second four-way valves are controlled so that after the refrigerant dissipates heat through the outdoor heat exchanger and the first plate heat exchanger, it becomes low-pressure, low-temperature refrigerant upon passing through the second expansion valve. This low-temperature refrigerant cools the water in the water circuit through the second plate heat exchanger. When the indoor heat exchanger is cooling, it uses the cold water from the second plate heat exchanger for cooling. This system can be adjusted according to the amount of heating or cooling demand, allowing the temperature of the first plate heat exchanger to be higher or the temperature of the second plate heat exchanger to be lower, better meeting user needs. Improve system efficiency. And achieve partial heating and partial cooling effects with the indoor heat exchangers without requiring additional piping.

[0018] In some embodiments of this application, a first water pump is provided in the water circuit, the first water pump being used to pump water via a first plate heat exchanger into the indoor heat exchanger;

[0019] It also includes a second water pump installed in the water circuit, the second water pump being used to pump water via the second plate heat exchanger into the indoor heat exchanger.

[0020] In this technical solution, a first water pump and a second water pump are installed in the water circuit to respectively deliver water from the first and second plate heat exchangers to the indoor heat exchangers. When the indoor heat exchangers are heating, the first water pump inputs the hot water (after heat exchange in the first plate heat exchanger) into the corresponding indoor unit. When the indoor heat exchangers are cooling, the second water pump inputs the cold water (after heat exchange in the second plate heat exchanger) into the corresponding indoor unit. This allows for the simultaneous heating and cooling of some indoor heat exchangers.

[0021] In some embodiments of this application, a valve assembly is connected to the indoor heat exchanger, and the valve assembly is used to control the connection and disconnection between the indoor heat exchanger and the water circuit.

[0022] In the technical solution, to prevent cold water from flowing into the corresponding indoor heat exchanger during heating and hot water from flowing into the corresponding indoor heat exchanger during cooling, a valve assembly is used to control the direction of the water entering the indoor heat exchanger. This ensures that only hot water passes through the first plate heat exchanger during heating and only cold water passes through the second plate heat exchanger during cooling, thus guaranteeing the heating and cooling performance of the indoor heat exchanger.

[0023] In some embodiments of this application, a first expansion valve is provided between the outdoor heat exchanger and the seventh interface.

[0024] In the technical solution, when heating is the primary function, the high-temperature refrigerant passes through the first plate heat exchanger and then the second plate heat exchanger. As the refrigerant passes through the second plate heat exchanger, it absorbs heat and its temperature increases. It then passes through the first expansion valve for throttling and evaporates again into a gaseous state before returning to the compressor via the outdoor heat exchanger. The first expansion valve ensures that the refrigerant returning to the compressor is in a superheated gaseous state, preventing liquid refrigerant from flowing back into the compressor and causing damage. When cooling is the primary function, the refrigerant passes through the outdoor heat exchanger and then through the first expansion valve (but without throttling). After entering the first plate heat exchanger, the refrigerant passes through the second expansion valve for throttling and cooling. The cooled refrigerant then passes through the second plate heat exchanger and returns to the compressor.

[0025] In some embodiments of this application, a controller is also included, the controller being configured to:

[0026] Upon receiving the power-on signal, the system determines whether the heating demand value is greater than the cooling demand value. If so, it enters the heating-first mode; otherwise, it enters the cooling-first mode.

[0027] In this technical solution, the addition of a controller enables the heat pump system to automatically switch operating modes based on actual heating and cooling demands. By determining the relative values ​​of heating and cooling capacity requirements, the system can intelligently select either a primary heating or primary cooling operating mode. This automated control method enhances the system's intelligence, reduces the inconvenience of manual operation for users, and allows for the rational allocation of system resources according to actual needs, improving energy efficiency and ensuring optimal performance in different operating modes.

[0028] In some embodiments of this application, the specific steps for determining whether the heating demand capacity is greater than the cooling demand capacity are as follows:

[0029] Obtain the rated heating capacity value of each indoor unit, and add the rated heating capacity values ​​of each indoor unit to obtain the heating demand capacity value;

[0030] Obtain the rated cooling capacity of each indoor unit, and add the rated cooling capacity values ​​of each indoor unit together to obtain the cooling demand value.

[0031] In this technical solution, the calculation method based on the rated capacity of the indoor unit is simple and reliable, and can truly reflect the heating and cooling needs of the system. This ensures that the controller can accurately determine and switch to the appropriate operating mode, further improving the system's operating efficiency and reliability.

[0032] In some embodiments of this application, the controller is configured as follows:

[0033] In the heating-primary mode, the first and second ports of the first four-way valve are connected, as are the third and fourth ports; the fifth and sixth ports of the second four-way valve are connected, as are the seventh and eighth ports.

[0034] In the technical solution, under the main heating mode, the high-temperature refrigerant output by the compressor does not pass through the outdoor heat exchanger, but directly passes through the first plate heat exchanger, which can significantly increase the temperature of the first plate heat exchanger; thus, the water passing through the first plate heat exchanger is heated significantly, thereby improving the heat exchange effect of the corresponding indoor heat exchanger.

[0035] In some embodiments of this application, the controller is configured as follows:

[0036] In the cooling-main mode, the first and fourth ports of the first four-way valve are connected, and the second and third ports are connected; the fifth and sixth ports of the second four-way valve are connected, the fifth and eighth ports are connected, and the sixth and seventh ports are connected.

[0037] In the technical solution, under the primary cooling mode, the high-temperature refrigerant output by the compressor dissipates heat through the outdoor heat exchanger and the first plate heat exchanger, and then becomes a low-pressure, low-temperature refrigerant through the second expansion valve. Because the refrigerant cools the water in the water circuit through the second plate heat exchanger, the indoor heat exchanger uses the cooled water after heat exchange with the second plate heat exchanger for cooling.

[0038] In some embodiments of this application, a temperature sensing module is also provided, which is used to detect the outlet water temperature value TO and the inlet water temperature value TI of the indoor unit.

[0039] The controller is configured to: after entering the heating main mode or the cooling main mode, after a preset time, acquire the outlet water temperature value TO and the inlet water temperature value TI of each indoor unit; calculate Qh, Qh=HPh1*(TI1-TO1)+HPh2*(TI2-TO2)+......+HPhn*(TIn-TOn); calculate Qc, Qc=HPc1*(TO1-TI1)+HPc2*(TO2-TI2)+......+HPcn*(TOn-TIn);

[0040] Determine whether the heating demand capacity value Qh is less than the cooling demand capacity value Qc. If not, then operate in heating mode as the primary mode; if so, then operate in cooling mode as the primary mode.

[0041] Where TOn is the outlet water temperature of indoor unit n, TIn is the inlet water temperature of indoor unit n; HPhn is the rated heating capacity of indoor unit n; and HPcn is the rated cooling capacity of indoor unit n.

[0042] In this technical solution, upon startup, the cooling and heating demands of the indoor unit cannot be accurately determined, so a rough estimate is made. After actually entering either the primary heating or cooling mode, and waiting for a preset time to stabilize, the heating and cooling demands are recalculated, and the corresponding mode is entered. During the determination, the difference between the inlet and outlet water temperatures of the indoor heat exchanger indicates the required cooling or heating capacity. This dynamic determination method based on real-time water temperature differences accurately reflects the actual needs of the indoor heat exchanger, avoiding mismatches in operating modes caused by initial judgment errors. This further optimizes system energy efficiency, ensuring the heat pump system operates efficiently and stably under different conditions, better meeting the actual needs of users.

[0043] In some embodiments of this application, a gas-liquid separator is also included, which is disposed between the third interface and the input terminal of the compressor.

[0044] In addition, this application also provides a heat pump system, which includes:

[0045] compressor;

[0046] Outdoor heat exchanger;

[0047] Heat exchange piping;

[0048] The first plate heat exchanger and the second plate heat exchanger are connected in series in the heat exchange pipeline.

[0049] The second expansion valve is disposed between the output end of the first plate heat exchanger and the input end of the second plate heat exchanger.

[0050] The water circuit is connected to the first plate heat exchanger and the second plate heat exchanger, and the heat exchange between the refrigerant in the heat exchange pipeline and the water in the water circuit is realized through the first plate heat exchanger and the second plate heat exchanger.

[0051] Multiple indoor heat exchangers are connected in parallel with the water circuit;

[0052] The first pipeline connects the output end of the compressor, the heat exchange pipeline, the outdoor heat exchanger, and the input end of the compressor in sequence.

[0053] The second pipeline connects the compressor output end, the outdoor heat exchanger, the heat exchange pipeline, and the compressor input end in sequence.

[0054] A valve module for switching between a first pipeline and a second pipeline.

[0055] In this technical solution, a valve module allows the refrigerant flow direction to be adjusted as needed. When heating demand is high, the control valve module directs the high-temperature refrigerant from the compressor directly through the first plate heat exchanger, bypassing the outdoor heat exchanger, primarily to increase its temperature. The indoor heat exchangers then use the hot water from the first plate heat exchanger for heating. When cooling demand is high, the control valve module directs the refrigerant to become low-pressure, low-temperature refrigerant after cooling through the outdoor and first plate heat exchangers. This low-temperature refrigerant then cools the water in the second plate heat exchanger. The indoor heat exchangers then use the cooled water from the second plate heat exchanger for cooling. This system can adjust the flow based on heating or cooling demand, adjusting the temperature of the first or second plate heat exchanger to better meet user needs and improve system efficiency. Furthermore, it achieves partial heating and partial cooling of the indoor heat exchangers without requiring additional piping.

[0056] 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

[0057] Figure 1 This is a schematic diagram of the overall structure of a heat pump system according to an embodiment of this application;

[0058] Figure 2 This is a schematic diagram of the compressor section of a heat pump system according to an embodiment of this application;

[0059] Figure 3 This is a schematic diagram of the water circuit portion of a heat pump system according to an embodiment of this application;

[0060] Figure 4 This is a schematic diagram of the refrigerant and water flow direction in the heat pump system under the heating-main mode according to the embodiments of this application.

[0061] Figure 5 This is a schematic diagram of the refrigerant and water flow direction in the cooling-main mode of a heat pump system according to an embodiment of this application.

[0062] Figure 6 This is a flowchart of the heat pump system according to an embodiment of this application;

[0063] Figure 7 This is a flowchart of the heat pump system according to an embodiment of this application;

[0064] Figure 8 This is a flowchart of the heat pump system according to an embodiment of this application;

[0065] Figure 9 This is a flowchart of the heat pump system according to an embodiment of this application;

[0066] Figure 10 This is a flowchart of the heat pump system according to an embodiment of this application.

[0067] In the above diagrams: 100, compressor; 200, outdoor heat exchanger; 300, outdoor fan; 400, first expansion valve; 500, first four-way valve; 600, second four-way valve; 700, heat exchange piping; 701, second expansion valve; 800, water circuit; 900, first plate heat exchanger; 110, second plate heat exchanger; 120, first indoor heat exchanger; 130, first connecting pipe; 140, first three-way valve A; 150, first three-way valve B; 160, first flow control valve; 170, second indoor... Internal heat exchanger; 180, First parallel pipe A; 190, First parallel pipe B; 210, Second connecting pipe; 220, Second three-way valve A; 230, Second three-way valve B; 240, Second flow control valve; 250, Third indoor heat exchanger; 260, Third connecting pipe; 270, Second parallel pipe A; 280, Second parallel pipe B; 290, Third three-way valve A; 310, Third three-way valve B; 320, Third flow control valve; 330, Gas-liquid separator; 340, First water pump; 350, 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 and second features are in direct contact, or that the first and second features are in indirect contact 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 an outdoor unit and multiple indoor units. The outdoor unit includes a compressor and an outdoor heat exchanger. The indoor units include multiple indoor heat exchangers. Additionally, it includes plate heat exchangers and water circuits. In cooling mode, the compressor compresses the refrigerant and sends it to the outdoor heat exchanger for cooling, then it enters the plate heat exchanger to cool the water in the water circuit. The water in the water circuit then enters the indoor heat exchangers, thus cooling the indoor temperature. In heating mode, the compressor directly delivers high-temperature refrigerant to the plate heat exchanger to heat the water in the water circuit. The water in the water circuit then enters the indoor heat exchangers, thus heating the indoor temperature.

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

[0075] Please refer to all the accompanying drawings. In one illustrative embodiment of the heat pump system of this application, the heat pump system includes a compressor 100, which compresses a refrigerant to raise its temperature and circulates it within the piping of the heat pump system.

[0076] In some embodiments, the heat pump system further includes a first four-way valve 500, which includes a first interface, a second interface, a third interface, and a fourth interface; the first interface is connected to the output end of the compressor 100; and the third interface is connected to the input end of the compressor 100.

[0077] In some embodiments, the heat pump system further includes a second four-way valve 600, which includes a fifth port, a sixth port, a seventh port, and an eighth port; the second port is connected to the fifth port. The cooperation of the first four-way valve 500 and the second four-way valve 600 allows for a change in the refrigerant flow direction.

[0078] In some embodiments, the heat pump system further includes an outdoor heat exchanger 200, with its two ends connected to a fourth interface and a seventh interface, respectively. The outdoor heat exchanger 200 facilitates heat exchange between the refrigerant and the outdoor air, thereby changing the temperature of the refrigerant.

[0079] In some embodiments, the heat pump system further includes a heat exchange pipe 700, the two ends of which are connected to a sixth interface and an eighth interface, respectively. Refrigerant circulation can be achieved through the heat exchange pipe 700.

[0080] In some embodiments, the heat pump system further includes a first plate heat exchanger 900 and a second plate heat exchanger 110, which are connected in series in the heat exchange pipeline 700. Heat exchange between the refrigerant and other media can be achieved through the first plate heat exchanger 900 and the second plate heat exchanger 110.

[0081] In some embodiments, the heat pump system further includes a second expansion valve 701, which is disposed between the output end of the first plate heat exchanger 900 and the input end of the second plate heat exchanger 110. When the second expansion valve 701 throttles, the high-temperature refrigerant passing through the first plate heat exchanger 900 becomes a low-temperature, low-pressure refrigerant after passing through the second expansion valve 701, thereby enabling the low-temperature refrigerant to enter the second plate heat exchanger 110 and cool the medium passing through the second plate heat exchanger 110.

[0082] In some embodiments, the heat pump system further includes a water path 800, which is connected to a first plate heat exchanger 900 and a second plate heat exchanger 110. Heat exchange is achieved between the refrigerant in the heat exchange pipe 700 and the water in the water path 800 through the first plate heat exchanger 900 and the second plate heat exchanger 110. The water passing through the first plate heat exchanger 900 is heated, and the water passing through the second plate heat exchanger 110 is cooled.

[0083] In some embodiments, both the first plate heat exchanger 900 and the second plate heat exchanger 110 include two flow channels. One flow channel of the first plate heat exchanger 900 and the second plate heat exchanger 110 is connected in series with the heat exchange pipeline 700; the other flow channel is connected in series with the water channel 800.

[0084] In some embodiments, the heat pump system further includes multiple indoor heat exchangers connected in parallel with the water circuit 800. During heating, the indoor heat exchangers transfer the heat from the water heated by the first plate heat exchanger 900 to the room, thereby raising the room temperature. During cooling, the indoor heat exchangers transfer the heat from the water cooled by the second plate heat exchanger 110 to the room, thereby lowering the room temperature.

[0085] In the above scheme, by setting two four-way valves, the heat pump system can flexibly switch between heating and cooling modes. The interface connection method of the first four-way valve 500 and the second four-way valve 600 allows the refrigerant flow direction to be changed as needed. When there is a greater demand for heating, the first four-way valve 500 and the second four-way valve 600 are controlled so that the high-temperature refrigerant output by the compressor 100 bypasses the outdoor heat exchanger 200 and passes directly through the first plate heat exchanger 900, mainly to increase the temperature of the first plate heat exchanger 900; when the indoor heat exchanger is heating, it uses the hot water after heat exchange in the first plate heat exchanger 900 for heating. When there is a high demand for cooling, the first four-way valve 500 and the second four-way valve 600 are controlled so that the refrigerant, after dissipating heat through the outdoor heat exchanger 200 and the first plate heat exchanger 900, becomes a low-pressure, low-temperature refrigerant when passing through the second expansion valve 701. This low-temperature refrigerant then cools the water in the water circuit 800 through the second plate heat exchanger 110. When the indoor heat exchangers are cooling, the cooled water from the second plate heat exchanger 110 provides the cooling effect. The system can be adjusted according to the demand for heating or cooling, allowing the temperature of the first plate heat exchanger 900 to be higher or the temperature of the second plate heat exchanger 110 to be lower, better meeting user needs and improving system efficiency. Furthermore, it achieves the effect of partial heating and partial cooling in the indoor heat exchangers without the need for additional piping.

[0086] In some embodiments, the heat pump system further includes an outdoor fan 300, which blows air onto an outdoor heat exchanger 200 to achieve heat exchange between the refrigerant passing through the outdoor heat exchanger 200 and the air.

[0087] In some embodiments, the heat pump system further includes a first water pump 340 disposed in the water passage 800, the first water pump 340 being used to pump water via the first plate heat exchanger 900 into the indoor heat exchanger. The first water pump 340 enables the circulation of water between the first plate heat exchanger 900 and the corresponding indoor unit.

[0088] In some embodiments, the heat pump system further includes a second water pump 350 disposed in the water passage 800, the second water pump 350 being used to pump water via the second plate heat exchanger 110 into the indoor heat exchanger. The circulation of water flow between the second plate heat exchanger 110 and the corresponding indoor unit is achieved by the first water pump 340.

[0089] The above scheme, by installing a first water pump 340 and a second water pump 350 in the water circuit 800, can respectively deliver water from the first plate heat exchanger 900 and the second plate heat exchanger 110 to the indoor heat exchanger. When the indoor heat exchanger is heating, the first water pump 340 inputs the hot water after heat exchange in the first plate heat exchanger 900 into the corresponding indoor unit. When the indoor heat exchanger is cooling, the second water pump 350 inputs the cold water after heat exchange in the second plate heat exchanger 110 into the corresponding indoor unit. This allows for the simultaneous heating and cooling of some indoor heat exchangers.

[0090] In some embodiments, each indoor heat exchanger has a corresponding connecting pipe, and the connecting pipe of each indoor heat exchanger is connected in parallel with the water circuit 800. Water in the water circuit 800 can enter the corresponding indoor heat exchanger through the corresponding connecting pipe.

[0091] In some embodiments, a valve assembly is connected to the indoor heat exchanger to control the connection and disconnection between the indoor heat exchanger and the water circuit 800. This is to prevent cold water from flowing into the corresponding indoor heat exchanger during heating and to prevent hot water from flowing into the corresponding indoor heat exchanger during cooling. The valve assembly controls the direction of the water circuit 800 entering the indoor heat exchanger, ensuring that only hot water passes through the first plate heat exchanger 900 during heating and only cold water passes through the second plate heat exchanger 110 during cooling. This guarantees the heating and cooling performance of the indoor heat exchanger.

[0092] In some embodiments, the water passage 800 includes a first water section and a second water section. The first water section is connected to one interface of the first plate heat exchanger 900 and one interface of the second plate heat exchanger 110, and the second water section is connected to the other interface of the first plate heat exchanger 900 and the other interface of the second plate heat exchanger 110. Water in the water passage 800 flows through the first water section and the second water section within the first plate heat exchanger 900 and the second plate heat exchanger 110.

[0093] In some embodiments, the two ends of the connecting pipes of each indoor heat exchanger are connected to a first water section and a second water section, respectively. In heating mode, water flows through the first plate heat exchanger 900, then enters the connecting pipe through a portion of the first water section, and after passing through the corresponding indoor heat exchanger, flows back to the first plate heat exchanger 900 through a portion of the second water section to achieve circulation. In cooling mode, water flows through the second plate heat exchanger 110, then enters the connecting pipe through a portion of the first water section, and after passing through the corresponding indoor heat exchanger, flows back to the second plate heat exchanger 110 through a portion of the second water section to achieve circulation.

[0094] In some embodiments, taking the first indoor heat exchanger 120 as an example, the first indoor heat exchanger 120 corresponds to the first connecting pipe 130. The two ends of the first connecting pipe 130 are respectively connected to the first water section and the second water section. The corresponding valve group is the first valve group, which includes a first three-way valve A140 and a first three-way valve B150. The first three-way valve A140 is located at the connection between the first connecting pipe 130 and the first water section, and the first three-way valve B150 is located at the connection between the first connecting pipe 130 and the second water section. In heating mode, the first three-way valve A140 and the first three-way valve B150 connect the first plate heat exchanger 900 to the first connecting pipe 130. In cooling mode, the first three-way valve A140 and the first three-way valve B150 connect the second plate heat exchanger 110 to the first connecting pipe 130.

[0095] Furthermore, the first valve assembly also includes a first flow control valve 160, which is disposed in the first connecting pipe 130. The flow rate in the first connecting pipe 130 is controlled by the first flow control valve 160, thereby controlling the cooling or heating effect of the first indoor heat exchanger 120.

[0096] In some embodiments, multiple parallel pipes are connected in parallel on the first water section. The parallel pipes are connected to the connecting pipes of the corresponding indoor heat exchangers, thereby realizing the parallel connection of each indoor heat exchanger with the water circuit 800.

[0097] Further, taking a second indoor heat exchanger 170 as an example, the second indoor heat exchanger 170 corresponds to a second connecting pipe 210 and a second valve assembly. The two ends of the second connecting pipe 210 are connected to the first parallel pipe A180 and the first parallel pipe B190, respectively. The second valve assembly includes a second three-way valve A220, a second three-way valve B230, and a second flow control valve 240. The second three-way valve A220 is located between the first parallel pipe A180 and the second connecting pipe 210. The second three-way valve B230 is located between the first parallel pipe B190 and the second connecting pipe 210. The second flow control valve 240 is located on the second connecting pipe 210.

[0098] In heating mode, the second three-way valves A220 and B230 connect the second connecting pipe 210 to the first plate heat exchanger 900. Water flows through the first plate heat exchanger 900, passes through a portion of the first water section, and enters the first parallel pipe A180. Water flows through the second three-way valve A220 into the second connecting pipe and then into the second indoor heat exchanger 170. The output water flows through the second connecting pipe 210, passes through the second three-way valve B230, enters the first parallel pipe, and then flows back to the first plate heat exchanger 900.

[0099] In cooling mode, the second three-way valves A220 and B230 connect the second connecting pipe 210 to the second plate heat exchanger 110. Water flows through the second plate heat exchanger 110, passes through a portion of the first water section, and enters the first parallel pipe A180. Water flows through the second three-way valve A220 into the second connecting pipe and then into the second indoor heat exchanger 170. The output water flows through the second connecting pipe 210, passes through the second three-way valve B230, enters the first parallel pipe, and then flows back to the first plate heat exchanger 900.

[0100] Furthermore, taking a third indoor heat exchanger 250 as an example, the third indoor heat exchanger 250 corresponds to a third connecting pipe 260 and a third valve assembly. The two ends of the third connecting pipe 260 are connected to the second parallel pipe A270 and the second parallel pipe B280, respectively. The third valve assembly includes a third three-way valve A290, a third three-way valve B310, and a third flow control valve 320. The third three-way valve A290 is located between the second parallel pipe A270 and the third connecting pipe 260. The third three-way valve B310 is located between the second parallel pipe B280 and the third connecting pipe 260. The third flow control valve 320 is located on the third connecting pipe 260.

[0101] In heating mode, the third three-way valve A290 and the third three-way valve B310 connect the third connecting pipe 260 to the first plate heat exchanger 900. Water flows through the first plate heat exchanger 900, passes through a portion of the first water section, and enters the second parallel pipe A270. Water flows through the third three-way valve A290, enters the third connecting pipe, and then enters the third indoor heat exchanger 250. The output water flows through the third connecting pipe 260, passes through the third three-way valve B310, enters the second parallel pipe, and then flows back to the first plate heat exchanger 900.

[0102] In cooling mode, the third three-way valve A290 and the third three-way valve B310 connect the third connecting pipe 260 to the second plate heat exchanger 110. Water flows through the second plate heat exchanger 110, passes through a portion of the first water section, and enters the second parallel pipe A270. Water flows through the third three-way valve A290, enters the third connecting pipe, and then enters the third indoor heat exchanger 250. The output water flows through the third connecting pipe 260, passes through the third three-way valve B310, enters the second parallel pipe, and then flows back to the first plate heat exchanger 900.

[0103] It is worth noting that in cases with more indoor heat exchangers, the installation method is the same as that of the indoor heat exchangers described above, and will not be repeated here.

[0104] Specifically, the first three-way valve A140 and the first three-way valve B150 are used to close the water circuit 800 to prevent water passing through the first plate heat exchanger 900 and the second plate heat exchanger 110 from entering the corresponding indoor heat exchanger simultaneously.

[0105] In some embodiments, a first expansion valve 400 is provided between the outdoor heat exchanger 200 and the seventh interface. When heating is the primary function, the high-temperature refrigerant passes through the first plate heat exchanger 900 and then the second plate heat exchanger 110. As the refrigerant passes through the second plate heat exchanger 110, it absorbs heat and its temperature increases. Then, it passes through the first expansion valve 400 for throttling and evaporates again into gaseous refrigerant, which then flows back to the compressor 100 via the outdoor heat exchanger 200. The first expansion valve 400 ensures that the refrigerant flowing back to the compressor 100 is in a superheated gaseous state, preventing liquid refrigerant from flowing back into the compressor 100 and damaging it. When cooling is the primary function, the refrigerant passes through the outdoor heat exchanger 200 and then through the first expansion valve 400 without throttling. After entering the first plate heat exchanger 900, the refrigerant passes through the second expansion valve 701 for throttling and cooling. The cooled refrigerant then flows back to the compressor 100 via the second plate heat exchanger 110.

[0106] In some embodiments, the heat pump system includes multiple indoor units, with indoor heat exchangers disposed within the respective indoor units.

[0107] In some embodiments, the system further includes a controller configured to: upon receiving a power-on signal, determine whether the heating demand value is greater than the cooling demand value; if so, enter the heating-primary mode; otherwise, enter the cooling-primary mode. The addition of the controller enables the heat pump system to automatically switch operating modes based on actual heating and cooling demands. By determining the magnitude of the heating and cooling demand values, the system can intelligently select either a heating-primary or cooling-primary operating mode. This automated control method improves the system's intelligence level, reduces the inconvenience of manual operation for users, and can rationally allocate system resources according to actual needs, improving energy efficiency and ensuring optimal operating performance in different operating modes.

[0108] In some embodiments, the specific steps for determining whether the heating demand capacity is greater than the cooling demand capacity are: obtaining the rated heating capacity value of each indoor unit, and adding the rated heating capacity values ​​of each indoor unit to obtain the heating demand capacity value.

[0109] Obtain the rated cooling capacity of each indoor unit, and add the rated cooling capacity values ​​of each indoor unit together to obtain the cooling demand value.

[0110] Further, the specific steps to determine whether the heating demand is greater than the cooling demand are as follows: Calculate Qh, Qh = HPh1 + HPh2 + ... + HPhn; calculate Qc, Qc = HPc1 + HPc2 + ... + HPcn; and determine the relationship between Qh and Qc. If Qh ≥ Qc, then the heating mode is the primary mode; if Qh < Qc, then the cooling mode is the primary mode.

[0111] Where Qh is the heating demand capacity value; Qc is the cooling demand capacity value; HPhn is the rated heating capacity value of indoor unit n; and HPcn is the rated cooling capacity value of indoor unit n.

[0112] The above-described calculation method based on the rated capacity of the indoor unit is simple and reliable, and can accurately reflect the heating and cooling needs of the system. This ensures that the controller can accurately determine and switch to the appropriate operating mode, further improving the system's operating efficiency and reliability.

[0113] It is worth noting that the heating and cooling capacity values ​​of the indoor unit are fixed and can be obtained directly when the unit is turned on.

[0114] In some embodiments, the controller is configured to: in the primary heating mode, connect the first and second ports, and the third and fourth ports of the first four-way valve 500; and connect the fifth and sixth ports, and the seventh and eighth ports of the second four-way valve 600. In the primary heating mode, the high-temperature refrigerant output by the compressor 100 bypasses the outdoor heat exchanger 200 and passes directly through the first plate heat exchanger 900, which significantly increases the temperature of the first plate heat exchanger 900; thereby significantly raising the temperature of the water passing through the first plate heat exchanger 900, thus improving the heat exchange effect of the corresponding indoor heat exchanger.

[0115] In some embodiments, the controller is configured to: in the cooling-main mode, connect the first and fourth ports of the first four-way valve 500, and connect the second and third ports; connect the fifth and sixth ports of the second four-way valve 600, connect the fifth and eighth ports, and connect the sixth and seventh ports.

[0116] In the technical solution, under the primary cooling mode, the high-temperature refrigerant output by the compressor 100 dissipates heat through the outdoor heat exchanger 200 and the first plate heat exchanger 900, and then becomes a low-pressure, low-temperature refrigerant through the second expansion valve 701. Because the refrigerant cools the water in the water circuit 800 through the second plate heat exchanger 110, the indoor heat exchanger uses the cooled water after heat exchange with the second plate heat exchanger 110 for cooling during the cooling process.

[0117] In some embodiments, the controller is configured to: after entering the heating main mode or the cooling main mode, control the first water pump 340 to start and control the second water pump 350 to start. If all indoor heat exchangers are in heating mode, only the first water pump 340 is started. If all indoor heat exchangers are in heating mode, only the second water pump 350 is started.

[0118] In some embodiments, the indoor unit also includes an indoor fan, which blows air through the indoor heat exchanger. After exchanging heat with the indoor heat exchanger, the air is blown into the room to regulate the indoor temperature.

[0119] Understandably, when the indoor unit is in heating mode, the indoor heat exchanger is also in heating mode, and water enters the corresponding indoor heat exchanger after passing through the first plate heat exchanger 900. When the indoor unit is in cooling mode, the indoor heat exchanger is also in cooling mode, and water enters the corresponding indoor heat exchanger after passing through the second plate heat exchanger 110.

[0120] In some embodiments, the controller is configured not to turn on the indoor fan after entering the primary heating mode or primary cooling mode. This is because when the heat pump system first starts up, the water in the water circuit 800 has not yet undergone significant heat exchange, so the temperature of the indoor heat exchanger has not changed significantly. If the indoor fan is turned on at this time, the airflow that has not undergone significant heat exchange will be blown into the room, which will affect the user experience.

[0121] In some embodiments, the heat pump system further includes a temperature sensing module for detecting the temperature of water flowing in the first plate heat exchanger 900 and water flowing in the second plate heat exchanger 110.

[0122] The controller is configured to, upon entering either heating or cooling primary mode, acquire the water flow temperature within the first plate heat exchanger 900 via a temperature sensing module. If the water flow temperature within the first plate heat exchanger 900 exceeds a first preset temperature threshold, the indoor fan of the indoor unit in heating mode is activated. Similarly, the controller acquires the water flow temperature within the second plate heat exchanger 110 via the temperature sensing module. If the water flow temperature within the second plate heat exchanger 110 is below a second preset temperature threshold, the indoor fan of the indoor unit in cooling mode is activated.

[0123] With the above scheme, when the water temperature in the first plate heat exchanger 900 is higher than the first preset threshold, the indoor fan is turned on to ensure that the temperature of the blown air reaches a comfortable range, avoiding cold air blown out due to excessively low water temperature, thus improving the heating effect and user comfort. In cooling mode, when the water temperature in the second plate heat exchanger 110 is lower than the second preset threshold, the indoor fan is turned on to ensure that the temperature of the blown air is low enough, avoiding poor cooling effect due to excessively high water temperature, and preventing condensation problems caused by excessively high surface temperature of the indoor heat exchanger.

[0124] Specifically, the temperature sensing module includes a first temperature sensor for detecting the temperature of the first plate heat exchanger 900. The temperature sensing module also includes a second temperature sensor. The controller is configured to, upon entering either the heating-primary mode or the cooling-primary mode, acquire the water flow temperature value within the first plate heat exchanger 900 via the first temperature sensor. When the water flow temperature value within the first plate heat exchanger 900 is greater than a first preset temperature threshold, the indoor fan of the indoor unit in heating mode is activated. The controller also acquires the water flow temperature value within the second plate heat exchanger 110 via the second temperature sensor. When the water flow temperature value within the second plate heat exchanger 110 is less than a second preset temperature threshold, the indoor fan of the indoor unit in cooling mode is activated.

[0125] In some embodiments, the temperature sensing module is used to detect the outlet water temperature value TO and the inlet water temperature value TI of the indoor unit.

[0126] In some embodiments, the temperature sensing module includes a third temperature sensor and a fourth temperature sensor. A third temperature sensor is installed at the inlet of each indoor heat exchanger. A fourth temperature sensor is installed at the outlet of each indoor heat exchanger. The third temperature sensor detects the inlet water temperature of the corresponding indoor heat exchanger, and the fourth temperature sensor detects the outlet water temperature of the corresponding indoor heat exchanger.

[0127] In some embodiments, the controller is configured to: after entering the heating main mode or the cooling main mode, after a preset time, acquire the outlet water temperature value TO and the inlet water temperature value TI of each indoor unit; calculate Qh, Qh=HPh1*(TI1-TO1)+HPh2*(T12-TO2)+......+HPhn*(TIn-TOn); calculate Qc, Qc=HPc1*(TO1-TI1)+HPc2*(TO2-TI2)+......+HPcn*(TOn-TIn);

[0128] Determine whether the heating demand capacity value Qh is less than the cooling demand capacity value Qc. If not, then operate in heating mode as the primary mode; if so, then operate in cooling mode as the primary mode.

[0129] Where TOn is the outlet water temperature of indoor unit n, TIn is the inlet water temperature of indoor unit n; HPhn is the rated heating capacity of indoor unit n; and HPcn is the rated cooling capacity of indoor unit n.

[0130] Upon startup, the cooling and heating demands of the indoor unit cannot be accurately determined, so a rough estimate is made. After actually entering the primary heating or cooling mode, and waiting for a preset time to stabilize, the heating and cooling demands are recalculated, and the corresponding mode is entered. During the initial assessment, the difference between the inlet and outlet water temperatures of the indoor heat exchanger determines its required cooling or heating capacity. This dynamic assessment based on real-time water temperature differences accurately reflects the actual needs of the indoor heat exchanger, avoiding mismatches in operating modes caused by initial assessment errors. This further optimizes system energy efficiency, ensuring the heat pump system operates efficiently and stably under different conditions, better meeting the user's actual needs.

[0131] It is worth noting that the preset time can be a factory preset, a cloud-based preset, or a user-defined preset. Furthermore, a preset time of 5 minutes is preferred.

[0132] In some embodiments, after a waiting period, the system can reassess whether the heating demand capacity value Qh is less than the cooling demand capacity value Qc, and then determine whether to switch to a heating-primary mode or a cooling-primary mode based on the assessment. This improves the air conditioning's performance during long-term operation.

[0133] In some embodiments, the controller is configured to exit the corresponding heating-main mode or cooling-main mode upon receiving an exit signal.

[0134] In some embodiments, the exit signal may be a power-off signal.

[0135] In some embodiments, a gas-liquid separator 330 is also included, which is disposed between the third interface and the input terminal of the compressor 100. The gas-liquid separator 330 effectively separates the gaseous and liquid components in the refrigerant, ensuring that the refrigerant entering the compressor 100 is pure gas. This prevents liquid refrigerant from entering the compressor 100 and causing liquid slugging, thereby protecting the compressor 100 from damage and extending its service life. Simultaneously, the gas-liquid separator 330 also stabilizes the refrigerant circulation flow rate, optimizes the operating efficiency of the heat pump system, further improves the reliability and stability of the system, and provides a strong guarantee for the efficient and safe operation of the heat pump system.

[0136] In addition, this application also provides a heat pump system, which includes a compressor 100, which compresses a refrigerant to raise its temperature and circulates it in the pipes of the heat pump system.

[0137] In some embodiments, the heat pump system further includes an outdoor heat exchanger 200. The outdoor heat exchanger 200 facilitates heat exchange between the refrigerant and outdoor air, thereby changing the temperature of the refrigerant.

[0138] In some embodiments, the heat pump system further includes a heat exchange pipeline 700 through which the refrigerant can be circulated.

[0139] In some embodiments, the heat pump system further includes a first plate heat exchanger 900 and a second plate heat exchanger 110, which are connected in series in the heat exchange pipeline 700. Heat exchange between the refrigerant and other media can be achieved through the first plate heat exchanger 900 and the second plate heat exchanger 110.

[0140] In some embodiments, the heat pump system further includes a second expansion valve 701, which is disposed between the output end of the first plate heat exchanger 900 and the input end of the second plate heat exchanger 110. When the second expansion valve 701 throttles, the high-temperature refrigerant passing through the first plate heat exchanger 900 becomes a low-temperature, low-pressure refrigerant after passing through the second expansion valve 701, thereby enabling the low-temperature refrigerant to enter the second plate heat exchanger 110 and cool the medium passing through the second plate heat exchanger 110.

[0141] In some embodiments, the heat pump system further includes a water path 800, which is connected to a first plate heat exchanger 900 and a second plate heat exchanger 110. Heat exchange is achieved between the refrigerant in the heat exchange pipe 700 and the water in the water path 800 through the first plate heat exchanger 900 and the second plate heat exchanger 110. The water passing through the first plate heat exchanger 900 is heated, and the water passing through the second plate heat exchanger 110 is cooled.

[0142] In some embodiments, the heat pump system further includes multiple indoor heat exchangers connected in parallel with the water circuit 800. During heating, the indoor heat exchangers transfer the heat from the water heated by the first plate heat exchanger 900 to the room, thereby raising the room temperature. During cooling, the indoor heat exchangers transfer the heat from the water cooled by the second plate heat exchanger 110 to the room, thereby lowering the room temperature.

[0143] In some embodiments, the heat pump system further includes a first pipeline that sequentially connects the output end of the compressor 100, the heat exchange pipeline 700, the outdoor heat exchanger 200, and the input end of the compressor 100.

[0144] In some embodiments, the heat pump system further includes a second pipeline that sequentially connects the output end of the compressor 100, the outdoor heat exchanger 200, the heat exchange pipeline 700, and the input end of the compressor 100.

[0145] In some embodiments, the heat pump system further includes a valve module for switching between a first pipeline and a second pipeline.

[0146] In the above scheme, the refrigerant flow direction can be changed as needed by setting a valve module. When there is a high demand for heating, the control valve module ensures that the high-temperature refrigerant output from the compressor 100 bypasses the outdoor heat exchanger 200 and passes directly through the first plate heat exchanger 900, primarily to increase the temperature of the first plate heat exchanger 900; when the indoor heat exchanger is heating, it uses the hot water after heat exchange in the first plate heat exchanger 900 for heating. When there is a high demand for cooling, the control valve module ensures that after the refrigerant dissipates heat through the outdoor heat exchanger 200 and the first plate heat exchanger 900, it becomes low-pressure, low-temperature refrigerant when passing through the second expansion valve 701. The low-temperature refrigerant cools the water in the water circuit 800 through the second plate heat exchanger 110; when the indoor heat exchanger is cooling, it uses the cold water after heat exchange in the second plate heat exchanger 110 for cooling. This system can be adjusted according to the amount of heating or cooling demand, so that the temperature of the first plate heat exchanger 900 is higher or the temperature of the second plate heat exchanger 110 is lower, to better meet the user's needs. Improve system efficiency. And achieve partial heating and partial cooling effects with the indoor heat exchangers without requiring additional piping.

[0147] In some embodiments, the first pipeline and the second pipeline can be separate pipelines. A Chris valve is provided on the first pipeline to switch between the first pipeline and the second pipeline.

[0148] 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: compressor; The first four-way valve includes a first port, a second port, a third port, and a fourth port. The first interface is connected to the output terminal of the compressor; the third interface is connected to the input terminal of the compressor. The second four-way valve includes a fifth port, a sixth port, a seventh port, and an eighth port; the second port is connected to the fifth port. An outdoor heat exchanger, wherein both ends of the outdoor heat exchanger are respectively connected to the fourth interface and the seventh interface; A heat exchange pipeline, the two ends of which are respectively connected to the sixth interface and the eighth interface; The first plate heat exchanger and the second plate heat exchanger have a flow channel connected in series with the heat exchange pipeline. The second expansion valve is connected in series in the heat exchange pipeline and is disposed between the first plate heat exchanger and the second plate heat exchanger; The water circuit connects the other flow channels of the first plate heat exchanger and the second plate heat exchanger into a loop, and realizes the heat exchange between the refrigerant in the heat exchange pipeline and the water in the water circuit through the first plate heat exchanger and the second plate heat exchanger. Multiple indoor heat exchangers are connected in parallel with the water circuit.

2. The heat pump system according to claim 1, characterized in that, Includes a first water pump installed in the water circuit, the first water pump being used to pump water via the first plate heat exchanger into the indoor heat exchanger; It also includes a second water pump installed in the water circuit, the second water pump being used to pump water via the second plate heat exchanger into the indoor heat exchanger.

3. The heat pump system according to claim 2, characterized in that, The indoor heat exchanger is connected to a valve group, which is used to control the connection and disconnection between the indoor heat exchanger and the water circuit.

4. The heat pump system according to claim 3, characterized in that, A first expansion valve is provided between the outdoor heat exchanger and the seventh interface.

5. The heat pump system according to claim 4, characterized in that, It also includes a controller, which is configured to: Upon receiving the power-on signal, the system determines whether the heating demand value is greater than the cooling demand value. If so, it enters the heating-first mode; otherwise, it enters the cooling-first mode.

6. The heat pump system according to claim 5, characterized in that, The specific steps to determine whether the heating demand capacity is greater than the cooling demand capacity are as follows: Obtain the rated heating capacity value of each indoor unit, and add the rated heating capacity values ​​of each indoor unit to obtain the heating demand capacity value; Obtain the rated cooling capacity of each indoor unit, and add the rated cooling capacity values ​​of each indoor unit together to obtain the cooling demand value.

7. The heat pump system according to claim 5, characterized in that, The controller is configured to: In the heating-primary mode, the first and second ports of the first four-way valve are connected, as are the third and fourth ports; the fifth and sixth ports of the second four-way valve are connected, as are the seventh and eighth ports.

8. The heat pump system according to claim 5, characterized in that, The controller is configured to: In the cooling-main mode, the first and fourth ports of the first four-way valve are connected, and the second and third ports are connected; the fifth and sixth ports of the second four-way valve are connected, the fifth and eighth ports are connected, and the sixth and seventh ports are connected.

9. The heat pump system according to claim 8, characterized in that, It is also equipped with a temperature sensing module, which is used to detect the outlet water temperature TO and the inlet water temperature TI of the indoor unit. The controller is configured to: after entering the heating main mode or the cooling main mode, after a preset time, acquire the outlet water temperature value TO and the inlet water temperature value TI of each indoor unit. Calculate Qh, Qh = HPh1 * (TI1 - TO1) + HPh2 * (TI2 - TO2) + ... + HPhn * (Tln - TOn); Calculate Qc, Qc = HPc1 * (TO1 - TI1) + HPc2 * (TO2 - TI2) + ... + HPcn * (TOn - TIn); Determine whether the heating demand capacity value Qh is less than the cooling demand capacity value Qc. If not, then operate in heating mode as the primary mode; if so, then operate in cooling mode as the primary mode. Where TOn is the outlet water temperature of indoor unit n, Tln is the inlet water temperature of indoor unit n; HPhn is the rated heating capacity of indoor unit n; and HPcn is the rated cooling capacity of indoor unit n.

10. A heat pump system, characterized in that, It includes: compressor; Outdoor heat exchanger; Heat exchange piping; The first plate heat exchanger and the second plate heat exchanger are connected in series in the heat exchange pipeline. The second expansion valve is disposed between the output end of the first plate heat exchanger and the input end of the second plate heat exchanger. The water circuit is connected to the first plate heat exchanger and the second plate heat exchanger, and the heat exchange between the refrigerant in the heat exchange pipeline and the water in the water circuit is realized through the first plate heat exchanger and the second plate heat exchanger. Multiple indoor heat exchangers are connected in parallel with the water circuit; The first pipeline connects the output end of the compressor, the heat exchange pipeline, the outdoor heat exchanger, and the input end of the compressor in sequence. The second pipeline connects the compressor output end, the outdoor heat exchanger, the heat exchange pipeline, and the compressor input end in sequence. A valve module for switching between a first pipeline and a second pipeline.

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