Heat pump system

Abstract

The embodiment of the invention relates to the technical field of air conditioning equipment, in particular to a heat pump system. An indoor unit comprises a first indoor heat exchanger and a second indoor heat exchanger; the water module comprises a first heat exchange assembly and a second heat exchange assembly, and three outdoor four-way valves are arranged in the outdoor unit. In a heating mode, the first heat exchange assembly and the second heat exchange assembly are condensers; in a refrigeration mode, the first heat exchange assembly and the second heat exchange assembly are evaporators; in the heating dehumidification mode and the refrigeration dehumidification mode, the first heat exchange assembly is used for heating of the second indoor heat exchanger, and the second heat exchange assembly is used for refrigeration dehumidification of the first indoor heat exchanger. The first heat exchange assembly and the second heat exchange assembly are connected with the indoor heat exchanger in parallel, so that in a dehumidification mode, energy consumption is greatly reduced, and efficient heat recovery is achieved. The first heat exchange assembly and the second heat exchange assembly are controlled to work as an evaporator or a condenser at the same time, output of double-path cold water or double-path hot water is achieved, and the peak refrigerating and heating capacity of the system is improved.

Description

Technical Field

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

[0002] As people's requirements for indoor environmental comfort continue to increase, air source heat pump systems, as a highly efficient temperature regulation device, have been widely used in civil and commercial buildings. Traditional air conditioning or heat pump systems mainly have two basic modes: cooling and heating.

[0003] When dehumidification is required, the system simultaneously cools and dehumidifies the air through the indoor evaporator. However, this method has significant drawbacks, especially in cooling mode: when the indoor temperature has reached the set value but the humidity remains high, if the system continues to run for dehumidification, the room temperature will inevitably drop further, causing overcooling and severely affecting human comfort. To solve these problems, existing technologies have introduced a reheat design, which involves reheating the air after cooling and dehumidification to maintain a stable temperature, thereby achieving both cooling / dehumidification and heating / dehumidification modes.

[0004] However, while existing heat pump systems have solved the temperature control problem, the common practice is to use an electric heater to reheat the air after it has been cooled and dehumidified by the evaporator. This results in low overall energy efficiency during dehumidification. Furthermore, existing heat pump systems have limited cooling and heating capacity and cannot quickly reach the target temperature. Summary of the Invention

[0005] This application provides a heat pump system that can achieve heat recovery and has high cooling and heating capacity, improving user experience and solving the problem of low energy efficiency.

[0006] This application provides a heat pump system, including:

[0007] The indoor unit includes a first indoor heat exchanger and a second indoor heat exchanger;

[0008] Outdoor unit;

[0009] Water module, which connects the outdoor unit and the indoor unit;

[0010] The water module includes a first heat exchange component and a second heat exchange component. The first heat exchange component is connected in parallel with the first indoor heat exchanger and the second indoor heat exchanger, respectively. The second heat exchange component is connected in parallel with the first indoor heat exchanger and the second indoor heat exchanger, respectively.

[0011] The first heat exchange component and the second heat exchange component are respectively connected to the outdoor unit;

[0012] The outdoor unit is equipped with three outdoor four-way valves, which are used to change the flow direction of the refrigerant in the outdoor unit so that:

[0013] In heating mode, the first heat exchange component is a condenser used for heating the second indoor heat exchanger; the second heat exchange component is a condenser used for heating the first indoor heat exchanger.

[0014] In cooling mode, the first heat exchange component is an evaporator used for cooling the second indoor heat exchanger; the second heat exchange component is an evaporator used for cooling the first indoor heat exchanger.

[0015] In heating and dehumidification mode, the first heat exchange component is a condenser used for heating the second indoor heat exchanger; the second heat exchange component is an evaporator used for cooling and dehumidification of the first indoor heat exchanger.

[0016] In cooling and dehumidification mode, the first heat exchange component is a condenser used for heating the second indoor heat exchanger; the second heat exchange component is an evaporator used for cooling and dehumidification of the first indoor heat exchanger.

[0017] By installing three outdoor four-way valves in the outdoor unit, the flow direction of refrigerant in the outdoor unit and water module can be flexibly and precisely changed. This allows the system to construct differentiated refrigerant flow control strategies for different modes such as heating, cooling, heating dehumidification, and cooling dehumidification, thus improving system response speed. Furthermore, the first and second heat exchange components in the water module are connected in parallel with the indoor heat exchanger. In heating dehumidification or cooling dehumidification modes, through unique control logic, the second heat exchange component acts as an evaporator to cool and dehumidify the first indoor heat exchanger, while the first heat exchange component acts as a condenser, directly using the recovered condensation heat for reheating the second indoor heat exchanger. This significantly reduces energy consumption, achieving the effect of dehumidification before reheating. This results in precise and independent control of indoor temperature and humidity, and integrates evaporative heat absorption, condensation heat release, and heat recovery functions, achieving precise and independent temperature and humidity control and efficient heat recovery. Furthermore, in simple cooling or heating mode, the first and second heat exchange components operate simultaneously as evaporators or condensers, controlled by three outdoor four-way valves, and work in parallel with the two indoor heat exchangers to achieve dual-path chilled water or dual-path hot water output. This enhances the system's peak cooling and heating capacity while improving operational energy efficiency in this mode. By intelligently determining the cooling or heating demand, the system can flexibly switch between single and dual heat exchanger operation to adapt to partial loads, further improving energy efficiency. In dehumidification mode, the three outdoor four-way valves maintain a constant water circulation path, eliminating the need for frequent changes in the plate heat exchanger function during mode switching. This effectively avoids energy loss and response delays caused by water path switching, thereby stabilizing and strengthening the system's heat recovery capability and improving the overall system's switching efficiency and operational stability.

[0018] In some embodiments of this application, the outdoor unit has a first refrigerant pipe, a second refrigerant pipe, and a third refrigerant pipe connected to the water module;

[0019] The first heat exchange assembly includes a first heat exchanger and a first expansion valve that are interconnected.

[0020] The second heat exchange assembly includes a second heat exchanger and a second expansion valve that are interconnected.

[0021] The first refrigerant line is connected to the end of the first heat exchanger away from the first expansion valve, the third refrigerant line is connected to the end of the second heat exchanger away from the second expansion valve, and the second refrigerant line is connected in parallel to the ends of the first expansion valve and the second expansion valve away from the second heat exchanger.

[0022] In this way, the first and third refrigerant lines are independently connected to one end of the first and second heat exchangers, respectively, while the second refrigerant line is connected in parallel to the outlets of the two expansion valves, creating a highly flexible pathway for the two heat exchange components. This allows the first and second heat exchange components to be independently and flexibly configured as condensers or evaporators according to mode requirements. For example, in heating and dehumidification mode, the first heat exchanger acts as a condenser, and the second heat exchanger acts as an evaporator. Although their operating states are different, they can work in parallel and collaboratively to achieve the combined functions of heating and dehumidification. Furthermore, in traditional series systems, the entire flow path is switched during switching. The connection method of this application decouples the functions of the two heat exchange components, enabling independent control of the two heat exchange components. By independently setting first and second expansion valves for the first and second heat exchangers respectively, the system can independently and precisely regulate the state of the refrigerant flowing through the two heat exchangers. Regardless of whether the system is operating in cooling, heating, or any dehumidification mode, the two expansion valves can independently adjust their opening degree according to the evaporation or condensation function undertaken by their respective heat exchangers. This ensures that each heat exchanger operates under suitable conditions, allowing the energy release and absorption of the refrigerant to occur independently and optimally at different temperature levels and efficiencies on the two heat exchangers, achieving cascaded utilization of heat. Moreover, because the two expansion valves are independently controlled, when the outdoor four-way valve switches to change the system operating mode, there is no need to change the complex piping connections. Only the opening degree and function of the first and second expansion valves need to be reset through the program to quickly adapt to the new operating conditions, simplifying the control logic of system mode switching and improving reliability.

[0023] In some embodiments of this application, the water module further includes a first inlet three-way valve, a second inlet three-way valve, a first return three-way valve, and a second return three-way valve. The first ports of the first and second inlet three-way valves are respectively connected to the outlet of the first heat exchanger, the second ports of the first and second inlet three-way valves are respectively connected to the outlet of the second heat exchanger, the third port of the first inlet three-way valve is connected to the inlet of the first indoor heat exchanger, the third port of the second inlet three-way valve is connected to the inlet of the second indoor heat exchanger, the first ports of the first and second return three-way valves are respectively connected to the inlet of the first heat exchanger, the second ports of the first and second return three-way valves are respectively connected to the inlet of the second heat exchanger, the third port of the first return three-way valve is connected to the outlet of the first indoor heat exchanger, and the third port of the second return three-way valve is connected to the outlet of the second indoor heat exchanger.

[0024] In this way, through the coordinated control of four three-way valves, the system can achieve arbitrary connections from the two core heat exchange components (the first heat exchanger and the second heat exchanger) to the two terminal loads (the first indoor heat exchanger and the second indoor heat exchanger). Depending on the current operating mode, the hot or cold water produced by either the first or second heat exchanger can be distributed independently and on demand to the first and second indoor heat exchangers. For example, in heating and dehumidification mode, four three-way valves can be configured to direct hot water produced by the first heat exchanger (acting as a condenser) to the second indoor heat exchanger for heating, while simultaneously directing cold water produced by the second heat exchanger (acting as an evaporator) to the first indoor heat exchanger for cooling and dehumidification. This flexible connection method decouples temperature and humidity control, enabling dynamic, independent, and flexible allocation of the cold / heat source to the two indoor heat exchangers, allowing the two indoor heat exchangers to simultaneously and independently perform cooling and heating functions. Furthermore, the precise flow guidance of the three-way valve ensures that the water flowing to each indoor heat exchanger originates from the most suitable cold or heat source for the current mode, preventing the mixing of water flows of different temperatures and thus avoiding energy loss. For example, in cooling and dehumidifying mode, it ensures that the second indoor heat exchanger used for reheating receives hot water from the first heat exchanger, while the first indoor heat exchanger used for dehumidification receives cold water from the second heat exchanger, improving the overall system energy efficiency. All mode switching is accomplished through the three-way valve, replacing complex piping changes with valve switching, simplifying the system's mechanical structure and reducing long-term maintenance costs and failure rates.

[0025] In some embodiments of this application, the water module further includes a first water pump and a second water pump. One end of the first water pump is connected to the inlet end of the first heat exchanger, and the other end of the first water pump is connected to the first port of the first return water three-way valve and the second return water three-way valve, respectively. One end of the second water pump is connected to the inlet end of the second heat exchanger, and the other end of the second water pump is connected to the second port of the first return water three-way valve and the second return water three-way valve, respectively.

[0026] In this way, by equipping the first and second heat exchangers with independent first and second water pumps respectively, the system hydraulically constructs two completely independent circulation loops. The water flow rate and velocity to the first and second indoor heat exchangers can be independently and precisely adjusted according to their respective loads, such as cooling / dehumidification load or reheat load. This avoids the problems of uneven flow distribution and mutual interference in single-pump systems, ensuring that each indoor heat exchanger receives a water flow rate precisely matched to its needs under various operating modes, thereby achieving optimal heat exchange effect and energy efficiency. For example, in cooling / dehumidification mode, the first water pump drives the hot water circulation flowing through the first heat exchanger, which serves as a heat source, to heat the second indoor heat exchanger; simultaneously, the second water pump independently drives the cold water circulation flowing through the second heat exchanger, which serves as a cold source, to cool the first indoor heat exchanger. The water flow rate and pressure of the two circulations do not interfere with each other, ensuring that the cold and hot media can be stably and reliably delivered to the locations where they are needed simultaneously, allowing temperature and humidity to be decoupled and independently regulated.

[0027] In some embodiments of this application, the water module further includes a first shut-off valve and a second shut-off valve. The first shut-off valve is connected between the third port of the first inlet three-way valve and the inlet of the first indoor heat exchanger, and the second shut-off valve is connected between the third port of the second inlet three-way valve and the inlet of the second indoor heat exchanger.

[0028] In this way, the shut-off valve allows for independent isolation and maintenance of individual indoor units, improving system maintainability. When a particular indoor heat exchanger, such as the first indoor heat exchanger, needs maintenance, replacement, or prolonged shutdown, its corresponding first shut-off valve can be closed individually, completely isolating that indoor unit from the entire water circulation system. This allows maintenance work to be performed without affecting the normal operation of other indoor units, making it suitable for commercial or high-end residential scenarios with high continuous operation requirements, significantly improving the system's practicality and convenience. Simultaneously, the shut-off valve, as a reliable mechanical shut-off point, enhances system safety. During system installation, commissioning, or long-term idle periods, the shut-off valve can be closed to isolate the indoor piping from the water module, reducing the risk of system damage due to accidental leaks on the indoor side. Furthermore, as a clearly defined physical boundary, the shut-off valve facilitates segmented pressure testing for leaks, quickly locating the leak and simplifying installation and after-sales service procedures.

[0029] In some embodiments of this application, the outdoor unit further includes a compressor, and the outdoor four-way valve includes a first four-way valve, a second four-way valve, and a third four-way valve. The compressor's exhaust port is connected in parallel with the first port of the first four-way valve, the first port of the second four-way valve, and the first port of the third four-way valve, respectively. The compressor's intake port is connected in parallel with the third port of the first four-way valve, the third port of the second four-way valve, and the third port of the third four-way valve, respectively. The fourth port of the first four-way valve is connected to the second refrigerant line, the second port of the second four-way valve is connected to the third refrigerant line, and the second port of the third four-way valve is connected to the first refrigerant line.

[0030] In this way, by directly connecting the compressor's discharge and suction pipes in parallel to three four-way valves, the high-pressure discharge and low-pressure suction are shared by the three four-way valves. This allows the first, second, and third four-way valves to switch completely independently. Each four-way valve can independently decide whether to direct the compressor's high-pressure discharge to the branch it controls or to return the low-pressure refrigerant from that branch to the compressor, thus achieving complex mode control and switching between heating and cooling functions. Simultaneously, since the three refrigerant lines are independently controlled by three four-way valves, there is no crosstalk between them, achieving decoupling of system functions. For example, in heating and dehumidification mode, the third four-way valve can direct the high-pressure discharge to the first refrigerant line, making the first heat exchange component a condenser; simultaneously, the second four-way valve can connect the low-pressure suction to the third refrigerant line, making the second heat exchange component an evaporator. These two processes are independently controlled by different four-way valves, without interference, ensuring that even in combined modes, the pressure and function of each branch remain highly stable. All changes in operating modes can be achieved simply by switching the corresponding four-way valve. The refrigerant can quickly establish a new circulation through the shortest path, simplifying the complexity of the control algorithm and the difficulty of software implementation, resulting in a faster system response.

[0031] In some embodiments of this application, the outdoor unit further includes a gas-liquid separator connected between the compressor's air inlet and the third port of the first four-way valve, the third port of the second four-way valve, and the third port of the third four-way valve.

[0032] In this way, the gas-liquid separator provides protection for the compressor, effectively preventing liquid slugging. When the system switches modes, starts, stops, or experiences severe load fluctuations, unevaporated liquid refrigerant may return to the compressor. Installed before the compressor inlet, the gas-liquid separator acts as a buffer, efficiently intercepting and storing this liquid refrigerant. This ensures that only gaseous refrigerant enters the compressor, avoiding the risk of liquid slugging due to incompressibility when liquid refrigerant is drawn into the compressor cylinder. This protects internal compressor components, extends compressor lifespan, and improves system reliability under harsh conditions. By converging the return ports of the three four-way valves into a common gas-liquid separator, it essentially establishes a unified, final protection for all possible return paths. Furthermore, the amount of circulating refrigerant required by the system varies under different operating modes and loads. The gas-liquid separator can temporarily store excess liquid refrigerant in the system, acting as a buffer and storage unit for the system's refrigerant. When needed, it allows the refrigerant to slowly evaporate and replenish the compressor, enabling the system to better adapt to complex and changing operating conditions and improving the overall regulation and stability of the heat pump system.

[0033] In some embodiments of this application, the outdoor unit further includes an outdoor heat exchanger and an outdoor expansion valve. One end of the outdoor heat exchanger is connected to the fourth port of the first four-way valve, and the other end of the outdoor heat exchanger is connected to the outdoor expansion valve. The end of the outdoor expansion valve away from the outdoor heat exchanger is connected to the second refrigerant pipeline.

[0034] Thus, the outdoor heat exchanger is the area where the system exchanges energy with the outdoor environment. In cooling mode, the outdoor heat exchanger acts as the system's condenser, releasing heat to the environment; in heating mode, it acts as the system's evaporator, absorbing heat from the environment. The addition of the outdoor expansion valve allows the system to independently and precisely regulate the refrigerant flow through the outdoor heat exchanger. Regardless of whether the outdoor heat exchanger is defined as a condenser or evaporator in the current mode, the adjustment of the outdoor expansion valve ensures that the outdoor heat exchanger operates under normal conditions. For example, when the outdoor heat exchanger is used as an evaporator, the precise flow control of the outdoor expansion valve can accurately control its outlet superheat, ensuring safe compressor return and maximizing heat absorption efficiency. When the outdoor heat exchanger is used as a condenser, it can regulate the refrigerant flow through it, ensuring it is at the optimal condensing pressure and temperature. In addition, the outdoor expansion valve, together with the first and second expansion valves in the water module, constitute a fine-tuning system for throttling. This system allows the total pressure drop to be reasonably distributed across multiple throttling points according to different operating modes, thereby prioritizing the optimal heat exchange efficiency of the water-side heat exchangers (first and second heat exchangers).

[0035] In some embodiments of this application, the outdoor unit further includes an outdoor fan, which drives outdoor air to flow through the outdoor heat exchanger.

[0036] In this way, the forced convection of the outdoor fan greatly enhances the heat exchange efficiency of the outdoor heat exchanger. By actively and rapidly driving a large volume of outdoor air across the fin surface of the heat exchanger, the outdoor fan quickly breaks up the static air boundary layer adhering to the fin surface, increasing the convective heat transfer coefficient on the air side several times. This allows the outdoor heat exchanger to efficiently fulfill its function as an evaporator or condenser, ensuring high system energy efficiency. Simultaneously, when defrosting is required, the fan can reverse or change its speed to help quickly melt the frost layer, shorten defrosting time, and reduce the impact on indoor comfort.

[0037] In some embodiments of this application, the indoor unit further includes an indoor fan, which is located on the side of the first indoor heat exchanger away from the second indoor heat exchanger. The indoor fan is used to drive indoor air to flow sequentially through the first indoor heat exchanger and the second indoor heat exchanger.

[0038] In this way, the indoor air is forced to pass through the first indoor heat exchanger and then the second indoor heat exchanger by the indoor fan. This series airflow ensures the sequential nature of the air handling process, thus achieving dehumidification first and then temperature adjustment. For example, in cooling dehumidification mode, the air is first cooled by the first heat exchanger, and its moisture content will inevitably decrease in the process; then, this low-temperature, dry air flows through the second heat exchanger and is precisely reheated to achieve a comfortable supply air temperature. At the same time, using only one indoor fan and completing the air handling task through the air duct design reduces the number of moving parts, lowers manufacturing costs, operating noise, and potential failure points, making the indoor unit structure more compact and its operation more reliable. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a heat pump system provided in an embodiment of this application;

[0040] Figure 2 for Figure 1 A schematic diagram of the outdoor unit of the heat pump system shown.

[0041] Figure 3 for Figure 1 A schematic diagram of the water module of the heat pump system shown.

[0042] Figure 4 for Figure 1 A schematic diagram of the indoor unit of the heat pump system shown.

[0043] Figure 5 for Figure 2 The diagram shows the flow path of the outdoor unit in heating mode.

[0044] Figure 6 for Figure 3 and Figure 4The diagram shows the flow path of the water module and indoor unit in heating mode.

[0045] Figure 7 for Figure 2 The diagram shows the flow path of the outdoor unit in cooling mode.

[0046] Figure 8 for Figure 3 and Figure 4 The diagram shows the flow path of the water module and indoor unit in cooling mode.

[0047] Figure 9 for Figure 2 The diagram shows the flow path of the outdoor unit in heating and dehumidification mode.

[0048] Figure 10 for Figure 3 and Figure 4 The diagram shows the flow path of the water module and indoor unit in heating and dehumidification mode.

[0049] Figure 11 for Figure 2 The diagram shows the flow path of the outdoor unit in cooling and dehumidification mode.

[0050] Figure 12 for Figure 3 and Figure 4 The diagram shows the flow path of the water module and indoor unit in cooling and dehumidification mode.

[0051] Explanation of reference numerals in the attached figures:

[0052] 100-Heat pump system; 10-Indoor unit; 11-First indoor heat exchanger; 12-Second indoor heat exchanger; 13-Indoor fan; 20-Outdoor unit; 21-Outdoor four-way valve; 211-First four-way valve; 212-Second four-way valve; 213-Third four-way valve; 221-First refrigerant line; 222-Second refrigerant line; 223-Third refrigerant line; 23-Compressor; 24-Gas-liquid separator; 25-Outdoor heat exchanger; 26-Outdoor expansion valve 27 - Outdoor fan; 30 - Water module; 31 - First heat exchange component; 311 - First heat exchanger; 312 - First expansion valve; 32 - Second heat exchange component; 321 - Second heat exchanger; 322 - Second expansion valve; 33 - First inlet three-way valve; 331 - First shut-off valve; 34 - Second inlet three-way valve; 341 - Second shut-off valve; 35 - First return three-way valve; 36 - Second return three-way valve; 37 - First water pump; 38 - Second water pump. Detailed Implementation

[0053] Figure 1 This is a schematic diagram of the structure of a heat pump system provided in an embodiment of this application.

[0054] like Figure 1As shown, the heat pump system 100 provided in this embodiment includes an indoor unit 10, an outdoor unit 20, and a water module 30. The water module 30 is connected to the outdoor unit 20 and the indoor unit 10.

[0055] The indoor unit 10 includes a first indoor heat exchanger 11 and a second indoor heat exchanger 12.

[0056] The water module 30 includes a first heat exchange component 31 and a second heat exchange component 32. The first heat exchange component 31 is connected in parallel with both the first indoor heat exchanger 11 and the second indoor heat exchanger 12. The second heat exchange component 32 is also connected in parallel with both the first indoor heat exchanger 11 and the second indoor heat exchanger 12. That is, the first heat exchange component 31 and the second heat exchange component 32 can be connected to the first indoor heat exchanger 11 and the second indoor heat exchanger 12, respectively.

[0057] The first heat exchange component 31 and the second heat exchange component 32 are connected to the outdoor unit 20.

[0058] The outdoor unit 20 is equipped with three outdoor four-way valves 21. The three outdoor four-way valves 21 are used to change the flow direction of the refrigerant in the outdoor unit 20.

[0059] By installing three outdoor four-way valves 21 in the outdoor unit 20, the flow direction of refrigerant in the outdoor unit 20 and water module 30 can be flexibly and precisely changed, enabling the system to construct differentiated refrigerant flow control strategies for different modes such as heating, cooling, heating dehumidification and cooling dehumidification, thereby improving the system response speed.

[0060] Figure 6 for Figure 3 and Figure 4 The diagram shows the flow path of the water module and indoor unit in heating mode. Figure 8 for Figure 3 and Figure 4 The diagram shows the flow path of the water module and indoor unit in cooling mode. Figure 10 for Figure 3 and Figure 4 The diagram shows the flow path of the water module and indoor unit in heating and dehumidification mode. Figure 12 for Figure 3 and Figure 4 The diagram shows the flow path of the water module and indoor unit in cooling and dehumidification mode.

[0061] like Figure 6 As shown, specifically, the three outdoor four-way valves 21 are used to change the flow direction of the refrigerant in the outdoor unit 20 so that: in heating mode, the first heat exchange component 31 is a condenser, and its water side produces hot water for heating the second indoor heat exchanger 12. The second heat exchange component 32 is a condenser, and its water side produces hot water for heating the first indoor heat exchanger 11.

[0062] like Figure 8 As shown, in cooling mode, the first heat exchange component 31 is an evaporator, and its water side produces cold water for cooling the second indoor heat exchanger 12; the second heat exchange component 32 is an evaporator, and its water side produces cold water for cooling the first indoor heat exchanger 11.

[0063] like Figure 10 As shown, in the heating and dehumidification mode, the first heat exchange component 31 is a condenser, which produces hot water on its water side for heating the second indoor heat exchanger 12; the second heat exchange component 32 is an evaporator, which produces cold water on its water side for cooling and dehumidification of the first indoor heat exchanger 11.

[0064] like Figure 12 As shown, in the cooling and dehumidification mode, the first heat exchange component 31 is a condenser, which produces hot water on its water side for heating the second indoor heat exchanger 12; the second heat exchange component 32 is an evaporator, which produces cold water on its water side for cooling and dehumidification of the first indoor heat exchanger 11.

[0065] In the water module 30, the first heat exchange component 31 and the second heat exchange component 32 are connected in parallel with the indoor heat exchanger. In heating and dehumidification or cooling and dehumidification modes, through unique control logic, the second heat exchange component 32 acts as an evaporator to cool and dehumidify the first indoor heat exchanger 11, while the first heat exchange component 31 acts as a condenser, directly using the recovered condensation heat for reheating the second indoor heat exchanger 12, replacing the traditional electric heating reheating method. This achieves internal heat transfer and reuse, greatly reducing energy consumption and thus achieving the effect of dehumidification before reheating. It achieves precise and independent control of indoor temperature and humidity, and integrates evaporation heat absorption, condensation heat release and heat recovery functions, realizing precise and independent control of temperature and humidity and efficient heat recovery, significantly improving the overall energy efficiency ratio of the system.

[0066] Meanwhile, by setting up two independent indoor heat exchangers, namely the first indoor heat exchanger 11 and the second indoor heat exchanger 12, which are connected in parallel with the water module 30, and utilizing the water module 30 and three outdoor four-way valves 21 for flexible distribution of cold and heat sources, it is possible to achieve simultaneous cooling / dehumidification of the second heat exchange component 32 and heating / reheating of the first heat exchange component 31. This allows for independent adjustment of temperature and humidity, precisely maintaining the set indoor temperature and humidity, avoiding the room temperature fluctuations that accompany dehumidification in conventional air conditioners, and greatly improving human comfort. Furthermore, the three outdoor four-way valves 21 installed in the outdoor unit 20 ensure the stability and controllability of refrigerant flow under different operating modes. This eliminates the need for the water system to switch directions under different operating conditions, always maintaining the optimal flow path, greatly reducing energy loss and efficiency degradation caused by water system switching, thereby stabilizing and enhancing the system's heat recovery capability.

[0067] Furthermore, in simple cooling or heating mode, the first heat exchange component 31 and the second heat exchange component 32 operate simultaneously as evaporators or condensers, controlled by three outdoor four-way valves 21, and work in parallel with the two indoor heat exchangers to achieve dual-path cold water or dual-path hot water output. This enhances the system's peak cooling and heating capacity and improves operational energy efficiency in this mode. By intelligently determining the cooling or heating demand, the system can flexibly switch between single-heat exchanger operation and dual-heat exchanger operation to adapt to partial loads and further improve energy efficiency. In dehumidification mode, the three outdoor four-way valves 21 maintain a constant water circulation path, ensuring that the heat exchanger function in the water module 30 does not need to frequently change with mode switching. This effectively avoids response delays caused by water path switching and improves the switching efficiency and operational stability of the entire system.

[0068] Figure 2 for Figure 1 The diagram shows the structure of the outdoor unit of the heat pump system. Figure 3 for Figure 1 The diagram shows the structure of the water module in the heat pump system.

[0069] like Figure 2 and Figure 3 As shown in some embodiments of this application, the outdoor unit 20 has a first refrigerant pipe 221, a second refrigerant pipe 222, and a third refrigerant pipe 223 connected to the water module 30. The first heat exchange assembly 31 includes a first heat exchanger 311 and a first expansion valve 312 connected to each other. The second heat exchange assembly 32 includes a second heat exchanger 321 and a second expansion valve 322 connected to each other. The first refrigerant pipe 221 is connected to the end of the first heat exchanger 311 opposite to the first expansion valve 312. The third refrigerant pipe 223 is connected to the end of the second heat exchanger 321 opposite to the second expansion valve 322. The second refrigerant pipe 222 is connected in parallel to the ends of the first expansion valve 312 and the second expansion valve 322 opposite to the second heat exchanger 321, respectively.

[0070] The first refrigerant line 221 and the third refrigerant line 223 are independently connected to one end of the first heat exchanger 311 and the second heat exchanger 321, respectively, while the second refrigerant line 222 is connected in parallel to the outlets of the two expansion valves, creating a highly flexible pathway for the two heat exchange components. This allows the first heat exchange component 31 and the second heat exchange component 32 to be independently and flexibly configured as condensers or evaporators, depending on the mode requirements.

[0071] For example, in the heating and dehumidification mode, the first heat exchanger 311 acts as a condenser and the second heat exchanger 321 acts as an evaporator. Although they operate in different states, they can work in parallel and in coordination to achieve the combined functions of heating and dehumidification.

[0072] Furthermore, in traditional series systems, the entire flow path is switched during switching. The connection method of this application decouples the functions of the two heat exchange components, enabling independent control of the two heat exchange components. By independently setting a first expansion valve 312 and a second expansion valve 322 for the first heat exchanger 311 and the second heat exchanger 321 respectively, the system can independently and precisely regulate the state of the refrigerant flowing through the two heat exchangers. Regardless of whether the system is operating in cooling, heating, or any dehumidification mode, the two expansion valves can independently adjust their opening degree according to the evaporation or condensation function undertaken by their respective heat exchangers, ensuring that each heat exchanger can operate under suitable conditions. This allows the energy release and absorption of the refrigerant to occur independently and optimally on the two heat exchangers at different temperatures and efficiencies, achieving cascaded utilization of heat.

[0073] Moreover, since the two expansion valves are controlled independently, when the outdoor four-way valve 21 switches to change the system operating mode, there is no need to change the complex pipeline connection. It is only necessary to reset the opening degree and function of the first expansion valve 312 and the second expansion valve 322 through the program to quickly adapt to the new operating conditions, which simplifies the control logic of system mode switching and improves reliability.

[0074] In some embodiments of this application, the first heat exchanger 311 and the second heat exchanger 321 are plate heat exchangers. The first expansion valve 312 and the second expansion valve 322 are electronic expansion valves.

[0075] Figure 4 for Figure 1 The diagram shows the structure of the indoor unit of the heat pump system.

[0076] Please also refer to Figure 4 In some embodiments of this application, the water module 30 further includes a first inlet three-way valve 33, a second inlet three-way valve 34, a first return three-way valve 35, and a second return three-way valve 36.

[0077] The first ports of the first inlet three-way valve 33 and the second inlet three-way valve 34 are connected to the outlet of the first heat exchanger 311. The second ports of the first inlet three-way valve 33 and the second inlet three-way valve 34 are connected to the outlet of the second heat exchanger 321. The third port of the first inlet three-way valve 33 is connected to the inlet of the first indoor heat exchanger 11. The third port of the second inlet three-way valve 34 is connected to the inlet of the second indoor heat exchanger 12.

[0078] The first ports of the first return water three-way valve 35 and the second return water three-way valve 36 are connected to the inlet of the first heat exchanger 311. The second ports of the first return water three-way valve 35 and the second return water three-way valve 36 are connected to the inlet of the second heat exchanger 321. The third port of the first return water three-way valve 35 is connected to the outlet of the first indoor heat exchanger 11. The third port of the second return water three-way valve 36 is connected to the outlet of the second indoor heat exchanger 12.

[0079] Through the coordinated control of four three-way valves—the first inlet three-way valve 33, the second inlet three-way valve 34, the first return three-way valve 35, and the second return three-way valve 36—the system can distribute the cold or hot water generated by the first heat exchanger 311 and the second heat exchanger 321 to the first indoor heat exchanger 11 and the second indoor heat exchanger 12 as needed and independently.

[0080] For example, in the heating and dehumidification mode, four three-way valves can be configured to direct the hot water generated by the first heat exchanger 311 (which acts as a condenser) to the second indoor heat exchanger 12 for heating, while simultaneously directing the cold water generated by the second heat exchanger 321 (which acts as an evaporator) to the first indoor heat exchanger 11 for cooling and dehumidification.

[0081] This flexible connection method decouples temperature and humidity control, enabling dynamic, independent, and flexible allocation of the cold / heat source for the two indoor heat exchangers. This allows the first indoor heat exchanger 11 and the second indoor heat exchanger 12 to perform cooling and heating functions simultaneously and independently.

[0082] Furthermore, the precise flow guidance of the three-way valve ensures that the water flowing to each indoor heat exchanger comes from the most suitable cold or heat source in the current mode, thus avoiding the mixing of water flows of different temperatures and resulting in energy loss.

[0083] For example, in the cooling and dehumidification mode, it can be ensured that the second indoor heat exchanger 12 used for reheating receives hot water from the first heat exchanger 311, while the first indoor heat exchanger 11 used for dehumidification receives cold water from the second heat exchanger 321, preventing the cold water of the second heat exchanger 321 from mixing with the hot water of the first heat exchanger 311, thereby improving the energy efficiency of the entire system.

[0084] All mode switching is accomplished through the switching of three-way valves. Replacing complex pipeline changes with valve switching simplifies the system's mechanical structure and reduces maintenance costs and failure rates during long-term operation.

[0085] In some embodiments of this application, the water module 30 further includes a first water pump 37 and a second water pump 38. The first water pump 37 and the second water pump 38 are respectively used to drive the water circulation in the first heat exchanger 311 and the second heat exchanger 321.

[0086] One end of the first water pump 37 is connected to the inlet end of the first heat exchanger 311. The other end of the first water pump 37 is connected to the first port of the first return water three-way valve 35 and the second return water three-way valve 36, respectively.

[0087] One end of the second water pump 38 is connected to the inlet end of the second heat exchanger 321, and the other end of the second water pump 38 is connected to the second port of the first return water three-way valve 35 and the second return water three-way valve 36 respectively.

[0088] By equipping the first heat exchanger 311 and the second heat exchanger 321 with independent first water pumps 37 and second water pumps 38 respectively, the system hydraulically constructs two completely independent circulation loops. The water flow rate and velocity to the first indoor heat exchanger 11 and the second indoor heat exchanger 12 can be independently and precisely adjusted according to their respective loads, such as cooling and dehumidification loads or reheat loads. This avoids the problem of uneven flow distribution and mutual interference in a single water pump system, ensuring that each indoor heat exchanger can obtain a water flow rate that precisely matches its needs under various operating modes, thereby achieving optimal heat exchange effect and energy efficiency.

[0089] For example, in cooling and dehumidifying mode, the first water pump 37 drives a hot water circulation through the first heat exchanger 311, which serves as a heat source, to heat the first indoor heat exchanger 11. Simultaneously, the second water pump 38 independently drives a cold water circulation through the second heat exchanger 321, which serves as a cold source, to cool the second indoor heat exchanger 12. The water flow and pressure of the two circulations do not interfere with each other, ensuring that both hot and cold media can be stably and reliably delivered to the locations where they are needed, allowing temperature and humidity to be decoupled and independently regulated.

[0090] In some embodiments of this application, the water module 30 further includes a first shut-off valve 331 and a second shut-off valve 341. The first shut-off valve 331 is connected between the third port of the first inlet three-way valve 33 and the inlet of the first indoor heat exchanger 11. The second shut-off valve 341 is connected between the third port of the second inlet three-way valve 34 and the inlet of the second indoor heat exchanger 12.

[0091] The shut-off valve allows for independent isolation and maintenance of individual indoor units 10, improving system maintainability. When an indoor heat exchanger, such as the first indoor heat exchanger 11, needs maintenance, replacement, or long-term shutdown, its corresponding first shut-off valve 331 can be closed individually, completely isolating that indoor unit 10 from the entire water circulation system. This allows maintenance work to be carried out without affecting the normal operation of other indoor units 10, making it suitable for commercial or high-end residential scenarios with high continuous operation requirements, significantly improving the system's practicality and convenience.

[0092] Meanwhile, the shut-off valve, as a reliable mechanical shut-off point, enhances system safety. During system installation, commissioning, or long-term idle periods, the shut-off valve can be closed to isolate the indoor piping from the water module 30, reducing the risk of system damage due to accidental indoor leaks. Furthermore, the shut-off valve serves as a clear physical boundary, facilitating segmented pressure testing for leaks, quickly locating the leak, and simplifying installation and after-sales service procedures.

[0093] Figure 5 for Figure 2 The diagram shows the flow path of the outdoor unit in heating mode. Figure 7 for Figure 2 The diagram shows the flow path of the outdoor unit in cooling mode. Figure 9 for Figure 2 The diagram shows the flow path of the outdoor unit in heating and dehumidification mode. Figure 11 for Figure 2 The diagram shows the flow path of the outdoor unit in cooling and dehumidification mode.

[0094] like Figure 5 , Figure 7 , Figure 9 and Figure 11 As shown, in some embodiments of this application, the outdoor unit 20 further includes a compressor 23.

[0095] The outdoor four-way valve 21 includes a first four-way valve 211, a second four-way valve 212, and a third four-way valve 213.

[0096] The discharge port of compressor 23 is connected in parallel with the first port of the first four-way valve 211, the first port of the second four-way valve 212, and the first port of the third four-way valve 213. The intake port of compressor 23 is connected in parallel with the third port of the first four-way valve 211, the third port of the second four-way valve 212, and the third port of the third four-way valve 213.

[0097] The fourth port of the first four-way valve 211 is connected to the second refrigerant line 222. The second port of the second four-way valve 212 is connected to the third refrigerant line 223. The second port of the third four-way valve 213 is connected to the first refrigerant line 221.

[0098] By directly connecting the exhaust pipe and suction pipe of the compressor 23 to three outdoor four-way valves 21, the high-pressure exhaust and low-pressure suction are shared by the three outdoor four-way valves 21. This allows the first four-way valve 211, the second four-way valve 212, and the third four-way valve 213 to be switched completely independently. Each outdoor four-way valve 21 can independently decide to direct the high-pressure exhaust of the compressor 23 to the branch it controls, or to direct the low-pressure refrigerant from that branch back to the compressor 23, thereby achieving complex mode control and switching between cooling and heating functions.

[0099] Meanwhile, since the three refrigerant pipelines are independently controlled by three outdoor four-way valves 21, there is no crosstalk between them, thus achieving decoupling of system functions.

[0100] For example, in heating and dehumidification mode, the third four-way valve 213 can direct high-pressure exhaust to the first refrigerant line 221, making the first heat exchange component 31 a condenser. Simultaneously, the second four-way valve 212 can connect low-pressure suction to the third refrigerant line 223, making the second heat exchange component 32 an evaporator. These two processes are independently controlled by different four-way valves, without interference, ensuring that the pressure and function of each branch remain highly stable even in combined mode. Any change in operating mode only requires switching the corresponding outdoor four-way valve 21; the refrigerant can quickly establish a new circulation through the shortest path, simplifying the complexity of the control algorithm and the difficulty of software implementation, resulting in a faster system response.

[0101] In some embodiments of this application, the outdoor unit 20 further includes a gas-liquid separator 24. The gas-liquid separator 24 is connected between the air inlet of the compressor 23 and the third port of the first four-way valve 211, the third port of the second four-way valve 212, and the third port of the third four-way valve 213.

[0102] The gas-liquid separator 24 provides protection for the compressor 23, effectively preventing liquid slugging. During system mode switching, startup, shutdown, or severe load fluctuations, unevaporated liquid refrigerant may return to the compressor 23. Installed before the compressor 23's inlet, the gas-liquid separator 24 acts as a buffer container, efficiently intercepting and storing this liquid refrigerant. This ensures that only gaseous refrigerant enters the compressor 23, avoiding the risk of liquid slugging due to incompressibility when liquid refrigerant is drawn into the compressor 23 cylinder. This protects the internal components of the compressor 23, extends its service life, and improves the system's operational reliability under harsh conditions. By converging the return ports of the three four-way valves into a single, shared gas-liquid separator 24, a unified final protection is established for all possible return paths. Furthermore, the required amount of circulating refrigerant varies under different operating modes and loads. The gas-liquid separator 24 can temporarily store excess liquid refrigerant in the system, act as a buffer and storage unit for the system refrigerant, and allow it to slowly evaporate and replenish the compressor 23 when needed, so that the system can better adapt to complex and changing operating conditions and improve the regulation capability and stability of the entire heat pump system 100.

[0103] In some embodiments of this application, the outdoor unit 20 further includes an outdoor heat exchanger 25 and an outdoor expansion valve 26. One end of the outdoor heat exchanger 25 is connected to the fourth port of the first four-way valve 211. The other end of the outdoor heat exchanger 25 is connected to the outdoor expansion valve 26. The end of the outdoor expansion valve 26 opposite to the outdoor heat exchanger 25 is connected to the second refrigerant line 222.

[0104] The outdoor heat exchanger 25 is the area where the system exchanges energy with the outdoor environment. In cooling mode, the outdoor heat exchanger 25 acts as the system's condenser, releasing heat to the environment; in heating mode, it acts as the system's evaporator, absorbing heat from the environment. The addition of the outdoor expansion valve 26 allows the system to independently and precisely regulate the refrigerant flow through the outdoor heat exchanger 25. Regardless of whether the outdoor heat exchanger 25 is defined as a condenser or evaporator in the current mode, the adjustment of the outdoor expansion valve 26 ensures that the outdoor heat exchanger 25 operates under normal conditions. For example, when the outdoor heat exchanger 25 is used as an evaporator, the precise flow control of the outdoor expansion valve 26 can accurately control its outlet superheat, ensuring the safe return of gas from the compressor 23 and maximizing heat absorption efficiency. When the outdoor heat exchanger 25 is used as a condenser, it can regulate the refrigerant flow through it to ensure it is at the optimal condensing pressure and temperature. In addition, the outdoor expansion valve 26 together with the first expansion valve 312 and the second expansion valve 322 in the water module 30 constitute a throttling fine control system, which allows the system to reasonably distribute the total pressure drop to multiple throttling points according to different operating modes, thereby prioritizing the water-side heat exchangers (first heat exchanger 311 and second heat exchanger 321) to obtain the optimal heat exchange efficiency.

[0105] In some embodiments of this application, the outdoor expansion valve 26 is an electronic expansion valve.

[0106] Please see Figure 5 In heating mode, the outdoor heat exchanger 25 acts as an evaporator. The first four-way valve 211, the second four-way valve 212, and the third four-way valve 213 are all inactive. The refrigerant flow direction in the heat pump system 100 is as follows: compressor 23 → third four-way valve 213 → first refrigerant line 221 → water module 30 → second refrigerant line 222 → outdoor expansion valve 26 → outdoor heat exchanger 25 → first four-way valve 211 → gas-liquid separator 24 → compressor 23; and compressor 23 → second four-way valve 212 → third refrigerant line 223 → water module 30 → second refrigerant line 222 → outdoor expansion valve 26 → outdoor heat exchanger 25 → first four-way valve 211 → gas-liquid separator 24 → compressor 23.

[0107] Please see Figure 7In cooling mode, the outdoor heat exchanger 25 acts as a condenser. All four-way valves 211, 212, and 213 are activated. The refrigerant flow direction in the heat pump system 100 is as follows: compressor 23 → first four-way valve 211 → outdoor heat exchanger 25 → outdoor expansion valve 26 → second refrigerant line 222 → water module 30 → first refrigerant line 221 → third four-way valve 213 → gas-liquid separator 24 → compressor 23; and compressor 23 → first four-way valve 211 → outdoor heat exchanger 25 → outdoor expansion valve 26 → second refrigerant line 222 → water module 30 → third refrigerant line 223 → second four-way valve 212 → gas-liquid separator 24 → compressor 23.

[0108] Please see Figure 9 In heating and dehumidification mode, the outdoor heat exchanger 25 is the evaporator. The first four-way valve 211 and the third four-way valve 213 are not activated, while the second four-way valve 212 is activated. The refrigerant flow direction in the heat pump system 100 is: compressor 23 → third four-way valve 213 → first refrigerant line 221 → water module 30 → second refrigerant line 222 → outdoor expansion valve 26 → outdoor heat exchanger 25 → first four-way valve 211 → gas-liquid separator 24 → compressor 23; and compressor 23 → third four-way valve 213 → first refrigerant line 221 → water module 30 → third refrigerant line 223 → second four-way valve 212 → gas-liquid separator 24 → compressor 23.

[0109] Please see Figure 11 In cooling and dehumidification mode, the outdoor heat exchanger 25 is the condenser. The first four-way valve 211 and the second four-way valve 212 are both activated, while the third four-way valve 213 is not activated. The refrigerant flow direction in the heat pump system 100 is as follows: compressor 23 → third four-way valve 213 → first refrigerant line 221 → water module 30 → third refrigerant line 223 → second four-way valve 212 → gas-liquid separator 24 → compressor 23; and compressor 23 → first four-way valve 211 → outdoor heat exchanger 25 → outdoor expansion valve 26 → second refrigerant line 222 → water module 30 → third refrigerant line 223 → second four-way valve 212 → gas-liquid separator 24 → compressor 23.

[0110] In some embodiments of this application, the outdoor unit 20 further includes an outdoor fan 27. The outdoor fan 27 is used to drive outdoor air to flow through the outdoor heat exchanger 25.

[0111] The forced convection of the outdoor fan 27 greatly enhances the heat exchange efficiency of the outdoor heat exchanger 25. By actively and rapidly driving a large volume of outdoor air across the fin surface of the heat exchanger, the outdoor fan 27 quickly breaks up the static air boundary layer adhering to the fin surface, increasing the convective heat transfer coefficient on the air side several times. This allows the outdoor heat exchanger 25 to efficiently fulfill its function as an evaporator or condenser, ensuring high system energy efficiency. Simultaneously, when defrosting is required, the fan can reverse or change its speed to help quickly melt the frost layer, shorten defrosting time, and reduce the impact on indoor comfort.

[0112] In some embodiments of this application, the indoor unit 10 further includes an indoor fan 13. The indoor fan 13 is disposed on the side of the first indoor heat exchanger 11 opposite to the second indoor heat exchanger 12. The indoor fan 13 is used to drive indoor air to flow sequentially through the first indoor heat exchanger 11 and the second indoor heat exchanger 12.

[0113] The indoor fan 13 forces indoor air to pass through the first indoor heat exchanger 11 and then the second indoor heat exchanger 12. This series airflow ensures the sequential nature of the air handling process, achieving dehumidification before temperature adjustment. For example, in cooling and dehumidifying mode, the air is first cooled by the first heat exchanger 311, inevitably reducing its moisture content. Subsequently, this low-temperature, dry air flows through the second heat exchanger 321 and is precisely reheated to achieve a comfortable supply air temperature. Furthermore, using only one indoor fan 13, the air handling task can be completed through duct design, reducing the number of moving parts, manufacturing costs, operating noise, and potential failure points, resulting in a more compact structure and more reliable operation for the indoor unit 10.

[0114] like Figure 5 As shown, in heating mode, the refrigerant in the heat pump system 100 is controlled at the outdoor unit 20 and water module 30 as follows: the high-temperature and high-pressure refrigerant compressed by the compressor 23 enters the first heat exchanger 311 through the third four-way valve 213 and the first refrigerant pipeline 221, condenses and releases heat to heat the circulating water in the first heat exchanger 311, the first expansion valve 312 is fully open, the refrigerant passes through the first expansion valve 312 without throttling, only through the outdoor expansion valve 26 to evaporate and absorb heat, absorb heat from the outdoor environment, and return to the compressor 23 through the first four-way valve 211.

[0115] When the capacity of the first heat exchanger 311 is insufficient to meet the heating demand, the second heat exchanger 321 is activated. A portion of the high-temperature, high-pressure refrigerant compressed by the compressor 23 enters the second heat exchanger 321 through the second four-way valve 212 and the third refrigerant pipeline 223. The condensation releases heat to heat the circulating water in the second heat exchanger 321. The second expansion valve 322 is fully open, allowing the refrigerant to pass directly through it without throttling. It only undergoes throttling and evaporation through the outdoor expansion valve 26, absorbing heat from the outdoor environment and returning to the compressor 23 through the first four-way valve 211. Hot water is output from both the first and second heat exchangers, fully utilizing both heat exchangers for heating and improving the overall system efficiency.

[0116] The water-side control of the heat pump system 100 at the water module 30 and indoor unit 10 is as follows: the first water pump 37 operates, the circulating water absorbs heat in the first heat exchanger 311, the second inlet three-way valve 34 guides the first heat exchanger 311, the second shut-off valve 341 opens, the hot water in the first heat exchanger 311 enters the second indoor heat exchanger 12 through the second inlet three-way valve 34 and the second shut-off valve 341 to heat the air, the second return three-way valve 36 guides the first heat exchanger 311, and the circulating water returns to the first heat exchanger 311 through the second return three-way valve 36 and the first water pump 37.

[0117] When the capacity of the first heat exchanger 311 is insufficient to meet the heating demand, the second heat exchanger 321 is activated. The second water pump 38 operates, the first inlet three-way valve 33 directs the water to the second heat exchanger 321, the first shut-off valve 331 opens, and the hot water in the second heat exchanger 321 enters the first indoor heat exchanger 11 through the first inlet three-way valve 33 and the first shut-off valve 331 to provide initial heating for the air. The first return three-way valve 35 directs the water to the second heat exchanger 321, and the circulating water returns to the second heat exchanger 321 through the first return three-way valve 35 and the second water pump 38.

[0118] For example, the return air temperature is 15℃, and after passing through the first indoor heat exchanger 11, the temperature is 20℃. After passing through the second indoor heat exchanger 12, the outlet air temperature is 25℃. This secondary heating improves the system's capacity and ensures user comfort.

[0119] like Figure 7 As shown, in cooling mode, the refrigerant in the heat pump system 100 is controlled at the outdoor unit 20 and water module 30 as follows: the high-temperature and high-pressure refrigerant compressed by the compressor 23 first enters the outdoor heat exchanger 25, condenses and releases heat to absorb cooling capacity from the outdoor environment, the outdoor expansion valve 26 is fully opened, the liquid refrigerant passes through the second refrigerant pipeline 222, passes through the second expansion valve 322 for throttling and evaporation to absorb heat, cools the circulating water in the second heat exchanger 321, and then returns to the compressor 23 through the third refrigerant pipeline 223 and the second four-way valve 212.

[0120] When the capacity of the second heat exchanger 321 is insufficient to meet the heating demand, the first heat exchanger 311 is activated. A portion of the liquid refrigerant exiting the outdoor heat exchanger 25 undergoes throttling and evaporation through the first expansion valve 312, absorbing heat to cool the circulating water in the first heat exchanger 311. It then returns to the compressor 23 via the first refrigerant pipeline 221 and the third four-way valve 213. Both the second and first heat exchangers output chilled water, fully utilizing both heat exchangers for cooling and improving the overall system efficiency.

[0121] The water-side control of the heat pump system 100 at the water module 30 and indoor unit 10 is as follows: the second water pump 38 operates, the circulating water releases heat in the second heat exchanger 321, the first inlet three-way valve 33 guides the second heat exchanger 321, the first shut-off valve 331 opens, the cold water in the second heat exchanger 321 enters the first indoor heat exchanger 11 through the first inlet three-way valve 33 and the first shut-off valve 331 to cool the air, the first return three-way valve 35 guides the second heat exchanger 321, and the circulating water returns to the second heat exchanger 321 through the first return three-way valve 35 and the second water pump 38.

[0122] When the capacity of the second heat exchanger 321 cannot meet the heating demand, the first heat exchanger 311 is activated. The first water pump 37 operates, the second inlet three-way valve 34 guides the first heat exchanger 311, the second shut-off valve 341 opens, and the cold water in the first heat exchanger 311 enters the second indoor heat exchanger 12 through the second inlet three-way valve 34 and the second shut-off valve 341 to cool the air again. The second return three-way valve 36 guides the first heat exchanger 311, and the circulating water returns to the first heat exchanger 311 through the second return three-way valve 36 and the first water pump 37.

[0123] For example, the return air temperature is 35℃, the temperature after passing through the first indoor heat exchanger 11 is 30℃, and the outlet air temperature after passing through the second indoor heat exchanger 12 is 25℃. This secondary cooling improves the system's capacity and ensures user comfort.

[0124] like Figure 9 As shown, in heating and dehumidification mode, the refrigerant in the heat pump system 100 is controlled at the outdoor unit 20 and water module 30 as follows:

[0125] The high-temperature, high-pressure refrigerant compressed by compressor 23 enters the first heat exchanger 311 through the third four-way valve 213 and the first refrigerant line 221. It condenses and releases heat to heat the circulating water in the first heat exchanger 311. The first expansion valve 312 is fully open, and the liquid refrigerant splits into two parts. One part of the refrigerant passes through the second expansion valve 322, where it evaporates and absorbs heat, cooling the circulating water in the second heat exchanger 321. It then returns to compressor 23 through the third refrigerant line 223 and the second four-way valve 212. The other part of the refrigerant passes through the second refrigerant line 222, where it evaporates through the outdoor expansion valve 26, absorbing heat from the outdoor environment. It then returns to compressor 23 through the first four-way valve 211. At this point, hot water is output from the first heat exchanger 311, and cold water is output from the second heat exchanger 321, achieving heat recovery and meeting the needs of dehumidification and heating.

[0126] The water-side control of the heat pump system 100 at the water module 30 and indoor unit 10 is as follows:

[0127] The second water pump 38 operates, and the circulating water releases heat in the second heat exchanger 321. The first inlet three-way valve 33 guides the second heat exchanger 321, and the first shut-off valve 331 opens. The cold water in the second heat exchanger 321 enters the first indoor heat exchanger 11 through the first inlet three-way valve 33 and the first shut-off valve 331 to cool and dehumidify the air. The first return three-way valve 35 guides the second heat exchanger 321, and the circulating water returns to the second heat exchanger 321 through the first return three-way valve 35 and the second water pump 38.

[0128] The first water pump 37 operates, and the circulating water absorbs heat in the first heat exchanger 311. The second inlet three-way valve 34 guides the first heat exchanger 311, and the second shut-off valve 341 opens. The hot water in the first heat exchanger 311 enters the second indoor heat exchanger 12 through the second inlet three-way valve 34 and the second shut-off valve 341, heating the air after passing through the first indoor heat exchanger 11. The second return three-way valve 36 guides the first heat exchanger 311, and the circulating water returns to the first heat exchanger 311 through the second return three-way valve 36 and the first water pump 37.

[0129] For example, the return air temperature T1 = 25℃ and the moisture content A1 = 12g / kg. After passing through the first indoor heat exchanger 11, the temperature T2 = 20℃ and the moisture content A2 = 10g / kg, completing the cooling and dehumidification. After passing through the second indoor heat exchanger 12, the outlet air temperature T3 = 28℃ and the moisture content A3 = 10g / kg, which is then reheated, completing both dehumidification and heating functions to ensure user comfort.

[0130] like Figure 11 As shown, in cooling and dehumidification mode, the refrigerant in the heat pump system 100 is controlled at the outdoor unit 20 and water module 30 as follows:

[0131] Part of the high-temperature, high-pressure refrigerant compressed by compressor 23 enters outdoor heat exchanger 25 through the first four-way valve 211, condenses and releases heat to absorb cooling from the outdoor environment, outdoor expansion valve 26 is fully open, and flows to water module 30 through second refrigerant pipeline 222. The other part of the refrigerant enters first heat exchanger 311 through third four-way valve 213 and first refrigerant pipeline 221, condenses and releases heat to heat the circulating water in first heat exchanger 311, first expansion valve 312 is fully open. Then, the combined liquid refrigerant passes through second expansion valve 322 for throttling and evaporation to absorb heat, cooling the circulating water in second heat exchanger 321. Finally, the refrigerant returns to compressor 23 through third refrigerant pipeline 223 and second four-way valve 212. At this time, hot water is output from first heat exchanger 311 and cold water from second heat exchanger 321, achieving heat recovery and meeting the needs of dehumidification and cooling. Although second indoor heat exchanger 12 is for heating, the final outlet air temperature is lower than the inlet air temperature, so it is for cooling.

[0132] The water-side control of the heat pump system 100 at the water module 30 and indoor unit 10 is as follows:

[0133] The second water pump 38 operates, and the circulating water releases heat in the second heat exchanger 321. The first inlet three-way valve 33 guides the second heat exchanger 321, and the first shut-off valve 331 opens. The cold water in the second heat exchanger 321 enters the first indoor heat exchanger 11 through the first inlet three-way valve 33 and the first shut-off valve 331 to cool and dehumidify the air. The first return three-way valve 35 guides the second heat exchanger 321, and the circulating water returns to the second heat exchanger 321 through the first return three-way valve 35 and the second water pump 38.

[0134] The first water pump 37 operates, and the circulating water absorbs heat in the first heat exchanger 311. The second inlet three-way valve 34 guides the first heat exchanger 311, and the second shut-off valve 341 opens. The hot water in the first heat exchanger 311 enters the second indoor heat exchanger 12 through the second inlet three-way valve 34 and the second shut-off valve 341, heating the air after passing through the first indoor heat exchanger 11. The second return three-way valve 36 guides the first heat exchanger 311, and the circulating water returns to the first heat exchanger 311 through the second return three-way valve 36 and the first water pump 37.

[0135] For example, the return air temperature T1 = 25℃ and the moisture content A1 = 12g / kg. After passing through the first indoor heat exchanger 11, the temperature T4 = 20℃ and the moisture content A4 = 10g / kg, completing the cooling and dehumidification. After passing through the second indoor heat exchanger 12, the outlet air temperature T5 = 23℃ and the moisture content A5 = 10g / kg is reheated to the set temperature, but lower than the return air temperature, thus completing the two functions of dehumidification and cooling, ensuring user comfort.

[0136] In some embodiments of this application, when the heating mode is switched to the heating and dehumidification mode, and when the cooling mode is switched to the cooling and dehumidification mode, the switching process involves switching the heating and cooling functions on the second heat exchanger 321 and the first heat exchanger 311. If the switching process is not properly controlled, it will cause the outlet air temperature to be uncomfortable. Therefore, this application provides a method for controlling the switching process.

[0137] In this mode, the heating mode is switched to the heating and dehumidification mode, and the second heat exchanger 321 changes from heating to cooling. The control method includes:

[0138] When the heat pump system 100 receives a command to switch from heating mode to heating and dehumidification mode, the indoor fan 13 stops, and the second water pump 38 stops. At this time, the first shut-off valve 331 can also be closed to prevent uncomfortable air outlet temperature. The second four-way valve 212 activates, changing from heating the second heat exchanger 321 to cooling it. After running for two minutes, the circulating water in the second heat exchanger 321 is cooled to a certain temperature. The first inlet three-way valve 33, the first shut-off valve 331, and the first return three-way valve 35 guide the water to the second heat exchanger 321, and the second water pump 38 starts running. When the water temperature in the second heat exchanger 321 reaches a certain low water temperature, the indoor fan 13 starts running.

[0139] Similarly, when switching from cooling mode to cooling-dehumidification mode, the first heat exchanger 311 changes from cooling to heating. The control methods include:

[0140] When the heat pump system 100 receives a command to switch from cooling mode to cooling-dehumidification mode, the indoor fan 13 stops, and the first water pump 37 stops. At this time, the second shut-off valve 341 can also be closed to prevent uncomfortable outlet air temperature. The third four-way valve 213 reverses, changing from cooling the first heat exchanger 311 to heating the first heat exchanger 311. After running for two minutes, the circulating water in the first heat exchanger 311 is heated to a certain temperature. The second inlet three-way valve 34, the second shut-off valve 341, and the second return three-way valve 36 are directed to the first heat exchanger 311, and the first water pump 37 runs. When the water temperature of the first heat exchanger 311 reaches a certain high water temperature, the indoor fan 13 runs.

[0141] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of embodiments suitable for specific application considerations.

Claims

1. A heat pump system, characterized in that, include: The indoor unit (10) includes a first indoor heat exchanger (11) and a second indoor heat exchanger (12); Outdoor unit (20); Water module (30), the water module (30) is connected to the outdoor unit (20) and the indoor unit (10); The water module (30) includes a first heat exchange component (31) and a second heat exchange component (32). The first heat exchange component (31) is connected in parallel with the first indoor heat exchanger (11) and the second indoor heat exchanger (12), respectively. The second heat exchange component (32) is connected in parallel with the first indoor heat exchanger (11) and the second indoor heat exchanger (12), respectively. The first heat exchange component (31) and the second heat exchange component (32) are respectively connected to the outdoor unit (20); The outdoor unit (20) is equipped with three outdoor four-way valves (21), which are used to change the flow direction of the refrigerant in the outdoor unit (20) so that: In heating mode, the first heat exchange component (31) is a condenser used for heating the second indoor heat exchanger (12); the second heat exchange component (32) is a condenser used for heating the first indoor heat exchanger (11). In cooling mode, the first heat exchange component (31) is an evaporator used for cooling the second indoor heat exchanger (12); the second heat exchange component (32) is an evaporator used for cooling the first indoor heat exchanger (11). In the heating and dehumidification mode, the first heat exchange component (31) is a condenser used for heating the second indoor heat exchanger (12); the second heat exchange component (32) is an evaporator used for cooling and dehumidification of the first indoor heat exchanger (11). In the cooling and dehumidification mode, the first heat exchange component (31) is a condenser used for heating the second indoor heat exchanger (12); the second heat exchange component (32) is an evaporator used for cooling and dehumidification of the first indoor heat exchanger (11).

2. The heat pump system according to claim 1, characterized in that, The outdoor unit (20) has a first refrigerant pipe (221), a second refrigerant pipe (222) and a third refrigerant pipe (223) connected to the water module (30); The first heat exchange assembly (31) includes a first heat exchanger (311) and a first expansion valve (312) connected to each other; The second heat exchange assembly (32) includes a second heat exchanger (321) and a second expansion valve (322) connected to each other; The first refrigerant line (221) is connected to the end of the first heat exchanger (311) away from the first expansion valve (312), the third refrigerant line (223) is connected to the end of the second heat exchanger (321) away from the second expansion valve (322), and the second refrigerant line (222) is connected in parallel to the end of the first expansion valve (312) away from the first heat exchanger (311) and the end of the second expansion valve (322) away from the second heat exchanger (321).

3. The heat pump system according to claim 2, characterized in that, The water module (30) further includes a first inlet three-way valve (33), a second inlet three-way valve (34), a first return three-way valve (35), and a second return three-way valve (36). The first ports of the first inlet three-way valve (33) and the second inlet three-way valve (34) are respectively connected to the outlet of the first heat exchanger (311). The second ports of the first inlet three-way valve (33) and the second inlet three-way valve (34) are respectively connected to the outlet of the second heat exchanger (321). The third port of the first inlet three-way valve (33) is connected to the inlet of the first indoor heat exchanger (11). The second inlet three-way valve... The third port of (34) is connected to the inlet of the second indoor heat exchanger (12). The first ports of the first return water three-way valve (35) and the second return water three-way valve (36) are respectively connected to the inlet of the first heat exchanger (311). The second ports of the first return water three-way valve (35) and the second return water three-way valve (36) are respectively connected to the inlet of the second heat exchanger (321). The third port of the first return water three-way valve (35) is connected to the outlet of the first indoor heat exchanger (11). The third port of the second return water three-way valve (36) is connected to the outlet of the second indoor heat exchanger (12).

4. The heat pump system according to claim 3, characterized in that, The water module (30) also includes a first water pump (37) and a second water pump (38). One end of the first water pump (37) is connected to the inlet of the first heat exchanger (311), and the other end of the first water pump (37) is connected to the first port of the first return water three-way valve (35) and the second return water three-way valve (36). One end of the second water pump (38) is connected to the inlet of the second heat exchanger (321), and the other end of the second water pump (38) is connected to the second port of the first return water three-way valve (35) and the second return water three-way valve (36).

5. The heat pump system according to claim 3, characterized in that, The water module (30) further includes a first shut-off valve (331) and a second shut-off valve (341). The first shut-off valve (331) is connected between the third port of the first inlet three-way valve (33) and the inlet of the first indoor heat exchanger (11). The second shut-off valve (341) is connected between the third port of the second inlet three-way valve (34) and the inlet of the second indoor heat exchanger (12).

6. The heat pump system according to claim 2, characterized in that, The outdoor unit (20) also includes a compressor (23). The outdoor four-way valve (21) includes a first four-way valve (211), a second four-way valve (212), and a third four-way valve (213). The exhaust port of the compressor (23) is connected in parallel with the first port of the first four-way valve (211), the first port of the second four-way valve (212), and the first port of the third four-way valve (213). The air inlet of the compressor (23) is connected in parallel with the third port of the first four-way valve (211), the third port of the second four-way valve (212), and the third port of the third four-way valve (213). The fourth port of the first four-way valve (211) is connected to the second refrigerant line (222). The second port of the second four-way valve (212) is connected to the third refrigerant line (223). The second port of the third four-way valve (213) is connected to the first refrigerant line (221).

7. The heat pump system according to claim 6, characterized in that, The outdoor unit (20) also includes a gas-liquid separator (24), which is connected between the air inlet of the compressor (23) and the third port of the first four-way valve (211), the third port of the second four-way valve (212), and the third port of the third four-way valve (213).

8. The heat pump system according to claim 6, characterized in that, The outdoor unit (20) also includes an outdoor heat exchanger (25) and an outdoor expansion valve (26). One end of the outdoor heat exchanger (25) is connected to the fourth port of the first four-way valve (211), and the other end of the outdoor heat exchanger (25) is connected to the outdoor expansion valve (26). The end of the outdoor expansion valve (26) away from the outdoor heat exchanger (25) is connected to the second refrigerant pipeline (222).

9. The heat pump system according to claim 8, characterized in that, The outdoor unit (20) also includes an outdoor fan (27) for driving outdoor air to flow through the outdoor heat exchanger (25).

10. The heat pump system according to claim 1, characterized in that, The indoor unit (10) also includes an indoor fan (13), which is located on the side of the first indoor heat exchanger (11) away from the second indoor heat exchanger (12). The indoor fan (13) is used to drive indoor air to flow through the first indoor heat exchanger (11) and the second indoor heat exchanger (12) in sequence.

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