Multi-source switchable one-machine four-state intelligent air conditioner hot water system and control method

Abstract

The application provides a multi-source switchable one-machine four-state intelligent air conditioner hot water system and a control method, and relates to the technical field of heat pump air conditioner hot water systems.The system comprises an integrated heat exchange host, a hot water tank, a cold water tank and an intelligent controller component.The integrated heat exchange host integrates core components such as a condensing unit, an evaporating unit, a compressor and a throttling device, and realizes the switching of four working modes, namely air conditioner refrigeration and hot water preparation, air conditioner heating and cold water preparation, cold and hot water preparation and air conditioner independent operation, through the on-off combination of four electromagnetic valves, the start-stop control of a circulating pump and a fan;the intelligent controller automatically controls the states of components according to preset logic based on temperature signals collected by sensors and user instructions, and can also adjust the power of a variable frequency compressor and the opening degree of an electronic expansion valve.The application solves the problems of single heat source and rigid energy utilization of traditional systems, realizes efficient operation in a wide working condition, improves the energy utilization rate and meets the diversified use requirements of users.

Description

Technical Field

[0001] This invention relates to the field of heat pump air conditioning and hot water system technology, specifically to a multi-source switchable one-machine-four-state intelligent air conditioning and hot water system and its control method. Background Technology

[0002] Heat pump air conditioning and hot water systems are widely used in residential and small commercial settings due to their energy-saving and multi-functional advantages. Existing air-source heat pump air conditioning and hot water systems primarily use a four-way reversing valve to switch the refrigerant flow direction and utilize a condenser or plate heat exchanger to recover condensation heat to heat domestic hot water, thus achieving a simple integration of air conditioning and hot water functions.

[0003] However, such traditional systems have many technical defects and are difficult to meet the diverse usage needs under complex operating conditions: First, they rely on a single heat source / heat sink, using only air as the sole heat exchange medium. In extreme weather conditions such as severe cold or extreme heat, the heat exchange efficiency decreases significantly, resulting in insufficient heating / cooling capacity and a significantly reduced coefficient of performance (COP). Second, the utilization of waste heat / cooling is rigid. The condensation heat from the air conditioner can only be used to heat hot water in one direction. When hot water is not needed, excess heat is directly discharged into the air, resulting in energy waste. When a large amount of hot water is needed but there is no need for air conditioning, the system cannot efficiently produce hot water independently, resulting in low energy efficiency. Third, the reliability of low-temperature heating is poor, especially in winter. Simply extracting heat from the air easily leads to evaporator frosting, requiring periodic defrosting, causing indoor heating interruptions and severely reducing comfort; fourth, the operation mode is limited, only achieving simple linkage between air conditioning and hot water, unable to produce chilled water independently, and difficult to efficiently produce chilled and hot water when there is no need for air conditioning, limiting its adaptability to various scenarios; fifth, the level of intelligence is low, unable to dynamically adjust the operating status according to ambient temperature and user chilled / hot water demand priority, and mode switching is mostly manual operation, resulting in poor flexibility; sixth, the system heat exchange structure is simple, only achieving heat exchange between refrigerant and air, lacking the ability to adapt to multiple heat exchange media, resulting in low energy utilization.

[0004] To address the shortcomings of existing technologies, there is an urgent need to develop a multi-source heat sink switchable, multi-mode integrated, and highly intelligent air conditioning and hot water system and control method. This system should break through the limitations of a single heat source / sink, achieve refined energy management and on-demand allocation, improve the system's operating efficiency and reliability under all operating conditions, and simultaneously achieve automated and shock-free switching of operating modes. Summary of the Invention

[0005] The purpose of this invention is to overcome at least one technical problem existing in the prior art and to provide a multi-source switchable one-machine four-state intelligent air conditioning hot water system and control method.

[0006] On one hand, embodiments of the present invention provide a multi-source switchable one-unit four-state intelligent air conditioning and hot water system. The system includes: an integrated heat exchange unit, a hot water tank, a cold water tank, and an intelligent controller assembly. The integrated heat exchange unit integrates a condensing unit, an evaporating unit, a compressor, a gas-liquid separator, and a throttling device. The condensing unit includes a first solenoid valve, a second solenoid valve, a first plate heat exchanger, and a condenser. The evaporating unit includes a third solenoid valve, a fourth solenoid valve, a second plate heat exchanger, and an evaporator. One exhaust pipe of the compressor is connected to the inlet of the first solenoid valve, and the other is connected to the inlet of the second solenoid valve. The outlet of the first solenoid valve is connected to the refrigerant-side inlet of the first plate heat exchanger, and the refrigerant-side outlet of the first plate heat exchanger is connected to the first end of the throttling device. The outlet of the second solenoid valve is connected to the refrigerant-side inlet of the condenser, and the refrigerant-side outlet of the condenser is connected to the first end of the throttling device. One end of the throttling device is connected to the inlet of the fourth solenoid valve, and the other is connected to the inlet of the third solenoid valve. The outlet of the third solenoid valve is connected to the... The refrigerant inlet of the second plate heat exchanger is connected to the refrigerant inlet of the evaporator. The refrigerant outlet of the evaporator and the refrigerant outlet of the second plate heat exchanger are merged and then connected to the suction port of the compressor via a gas-liquid separator. The condenser is equipped with a first fan, and the evaporator is equipped with a second fan. A first circulating pump is connected in series in the pipeline connecting the condensate water path of the first plate heat exchanger to the hot water tank, forming a closed hot water circulation loop. A second circulating pump is connected in series in the pipeline connecting the evaporation water path of the second plate heat exchanger to the cold water tank, forming a closed cold water circulation loop. The intelligent control component includes an intelligent controller and sensors connected to it. It is used to control the opening and closing of the first, second, third, and fourth solenoid valves, the first circulating pump, the second circulating pump, the first motor, and the second motor based on preset control logic according to user instructions and / or sensor signals, so that the system operates in one of four working modes: air conditioning cooling and hot water heating, air conditioning heating and cold water preparation, preparation of cold and hot water, and air conditioning operation alone.

[0007] Furthermore, both the first plate heat exchanger and the second plate heat exchanger are indirect heat exchange structures. The first plate heat exchanger has an independent refrigerant side and a condensate water side, and the second plate heat exchanger has an independent refrigerant side and an evaporation water side.

[0008] Furthermore, the throttling device is a capillary tube or an electronic expansion valve; when the throttling device is an electronic expansion valve, the electronic expansion valve is signal-connected to the intelligent controller, and the intelligent controller adjusts the opening of the electronic expansion valve according to the superheat at the evaporator outlet to control the refrigerant flow; the first solenoid valve and the second solenoid valve are first three-way reversing valves, and the third solenoid valve and the fourth solenoid valve are second three-way reversing valves; or the four solenoid valves are integrated into a multi-way valve block to achieve switching of the refrigerant flow path.

[0009] Furthermore, the sensors include a hot water temperature sensor installed in the hot water tank, a cold water temperature sensor installed in the cold water tank, an indoor ambient temperature sensor installed indoors, and an outdoor ambient temperature sensor installed outdoors; the intelligent controller has built-in mode judgment logic, which automatically outputs control signals to switch between the air conditioning cooling and hot water heating mode, the air conditioning heating and cold water preparation mode, the cold and hot water preparation mode, and the air conditioning stand-alone operation mode based on the comparison results of the signals from each temperature sensor and the user-set values.

[0010] Furthermore, both the first circulating pump and the second circulating pump are variable frequency water pumps. The intelligent controller is also used to adjust the speed of the first circulating pump according to the temperature difference between the hot water tank and the first plate heat exchanger, and to adjust the speed of the second circulating pump according to the temperature difference between the cold water tank and the second plate heat exchanger.

[0011] Furthermore, the component states of the air conditioning cooling and hot water heating mode are as follows: the first solenoid valve is open, the second solenoid valve is closed, the third solenoid valve is closed, the fourth solenoid valve is open, the first circulation pump is open, the second circulation pump is closed, the first fan is stopped, and the second fan is started; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor enters the refrigerant side of the first plate heat exchanger through the first solenoid valve and exchanges heat with the cold water flowing into the condensate water path side of the first plate heat exchanger from the hot water tank. The hot water after heat exchange flows back to the hot water tank. After passing through the throttling device, the refrigerant enters the evaporator through the fourth solenoid valve to exchange heat with the air to achieve cooling, and returns to the compressor through the gas-liquid separator.

[0012] Furthermore, the component states of the air conditioning heating and chilled water preparation mode are as follows: the first solenoid valve is closed, the second solenoid valve is open, the third solenoid valve is open, the fourth solenoid valve is closed, the first circulation pump is closed, the second circulation pump is open, the first fan is started, and the second fan is stopped; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor flows through the second solenoid valve through the condenser to exchange heat with the air to achieve heating, and then enters the throttling device. After depressurization, it enters the refrigerant side of the second plate heat exchanger and exchanges heat with the room temperature water flowing into the evaporation water path side of the chilled water tank. The chilled water after heat exchange flows back to the chilled water tank, and the refrigerant returns to the compressor through the gas-liquid separator.

[0013] Furthermore, the component states for preparing the hot and cold water mode are as follows: the first solenoid valve is open, the second solenoid valve is closed, the third solenoid valve is open, the fourth solenoid valve is closed, the first circulation pump is open, the second circulation pump is open, the first fan is stopped, and the second fan is stopped; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor enters the refrigerant side of the first plate heat exchanger through the first solenoid valve and exchanges heat with the cold water flowing into the condensate side of the first plate heat exchanger from the hot water tank. The hot water after heat exchange flows back to the hot water tank. The refrigerant enters the refrigerant side of the second plate heat exchanger after passing through the throttling device and exchanges heat with the room temperature water flowing into the evaporation side of the second plate heat exchanger from the cold water tank. The cold water after heat exchange flows back to the cold water tank. The refrigerant returns to the compressor through the gas-liquid separator.

[0014] Furthermore, the component states in the stand-alone operation mode of the air conditioner are as follows: When the air conditioner is in cooling mode, the first solenoid valve is open, the second solenoid valve is closed, the third solenoid valve is closed, the fourth solenoid valve is open, the first circulation pump is closed, the second circulation pump is closed, the first fan is closed, and the second fan is started; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor enters the refrigerant side of the first plate heat exchanger through the first solenoid valve, without heat exchange, and after being depressurized by the throttling device, it enters the evaporator through the fourth solenoid valve to exchange heat with the air to achieve cooling. The refrigerant returns to the compressor through the gas-liquid separator. When the air conditioner is in heating mode, the first solenoid valve is closed, the second solenoid valve is open, the third solenoid valve is open, the fourth solenoid valve is closed, the first circulation pump is closed, the second circulation pump is closed, the first fan is started, and the second fan is closed. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor exchanges heat with the air through the condenser to achieve heating, enters the throttling device, and after being depressurized, enters the refrigerant side of the second plate heat exchanger through the third solenoid valve, without heat exchange, and the refrigerant returns to the compressor through the gas-liquid separator.

[0015] Secondly, embodiments of the present invention provide a control method for a multi-source switchable one-unit four-state intelligent air conditioning and hot water system. The method is applied to the aforementioned multi-source switchable one-unit four-state intelligent air conditioning and hot water system. The method includes: Step S1: acquiring the user-set target mode or temperature requirement, and acquiring real-time signals from the hot water tank temperature sensor, the cold water tank temperature sensor, and the indoor and outdoor ambient temperature sensors; Step S2: the intelligent controller determines the system's operating mode based on the acquired signals, including: when the user needs indoor cooling and the hot water tank temperature has not reached the set value, selecting the air conditioning cooling and hot water heating mode; when the user needs indoor cooling... When the hot water and cold water tank temperatures have not reached the set value, select the air conditioning heating and cold water preparation mode; when the user has no indoor heating or cooling needs but needs to prepare domestic hot water and / or cold water, or during off-peak electricity pricing periods, select the hot and cold water preparation mode; when both the hot water tank and cold water tank have reached the set temperature, or when the water tank system malfunctions or is under maintenance, select the air conditioning standby mode; Step S3: Based on the judgment result, the intelligent controller outputs a control signal to execute the solenoid valve on / off combination, circulation pump and fan start / stop control corresponding to any of the following modes: if the judgment is air conditioning cooling and hot water heating mode, then control the first solenoid valve to open, the second solenoid valve to close, the third solenoid valve to close, and the fourth solenoid valve to close. When all four solenoid valves are open, the first circulation pump starts, the second circulation pump stops, the first fan stops, and the second fan starts. If the system is determined to be in air conditioning cooling and hot water heating mode, then the first solenoid valve closes, the second solenoid valve opens, the third solenoid valve opens, the fourth solenoid valve closes, the first circulation pump closes, the second circulation pump starts, the first fan starts, and the second fan stops. If the system is determined to be in selective hot and cold water preparation mode, then the first solenoid valve opens, the second solenoid valve closes, the third solenoid valve opens, the fourth solenoid valve closes, the first circulation pump starts, the second circulation pump starts, the first fan stops, and the second fan stops. If the system is determined to be in air conditioning standalone operation mode, further analysis is performed on the air conditioning unit. In either cooling or heating mode, when in cooling mode, the system controls the first solenoid valve to open, the second solenoid valve to close, the third solenoid valve to close, and the fourth solenoid valve to open; the first circulation pump to close, the second circulation pump to close, the first fan to close, and the second fan to start. When in heating mode, the system controls the first solenoid valve to close, the second solenoid valve to open, the third solenoid valve to open, and the fourth solenoid valve to close; the first circulation pump to close, the second circulation pump to close, the first fan to start, and the second fan to close. Step S4: During system operation, the system continuously monitors the signals from each temperature sensor. When the mode switching conditions are met, the system returns to step S2 to achieve automatic mode switching.

[0016] Thirdly, embodiments of the present invention also provide an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the above-described multi-source switchable one-machine four-state intelligent air conditioning and hot water system control method.

[0017] Fourthly, embodiments of the present invention also provide a readable storage medium, which, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to execute the above-described multi-source switchable one-machine four-state intelligent air conditioning and hot water system control method.

[0018] The beneficial effects of this invention are: (1) It enables flexible switching between air and water dual heat sources / heat sinks. In winter, heat is extracted from the cold water tank with stable temperature to avoid low temperature decay of the air source and frost formation on the evaporator. In summer, the waste heat from air conditioning condensation is recovered to heat the hot water. It can still maintain efficient operation under extreme climate conditions, solving the defects of traditional single heat source / heat sink systems.

[0019] (2) Realize refined management and on-demand allocation of waste heat / cooling. Heat and cooling can be flexibly scheduled between air, indoor space and domestic hot water. In the hot and cold water preparation mode, energy circulates within the system and no ineffective energy is emitted to the environment. Compared with the traditional combination of "air conditioner + electric water heater + chiller", the operating cost is reduced by 60%-70%, which meets the "dual carbon" energy saving requirements.

[0020] (3) It realizes the automatic switching of four working modes: air conditioning cooling + hot water heating, air conditioning heating + cold water preparation, preparation of cold and hot water, and air conditioning running alone, covering the needs of all seasons in summer, winter and transition season, as well as the full functional needs of users for air conditioning, hot water and cold water. During the transition season, cold and hot water can be prepared separately without starting the air conditioner, further reducing operating costs.

[0021] (4) The refrigerant circuit and the water circulation circuit are independent of each other, the branch functions are clear, and when some heat sources / heat sinks are unavailable, the system can automatically switch to the backup source, and the system is robust.

[0022] (5) The three major functions of air conditioning, hot water preparation and cold water preparation are integrated into one device, saving installation space and equipment costs; the system components are modularly designed, and the refrigerant circuit, water circulation circuit and intelligent control circuit are independent of each other, which facilitates on-site installation and later maintenance. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of a multi-source switchable one-machine-four-state intelligent air conditioning and hot water system provided in Embodiment 1 of the present invention.

[0025] Figure 2 This is a flowchart of a multi-source switchable one-machine four-state intelligent air conditioning and hot water system control method provided in Embodiment 2 of the present invention.

[0026] Figure 3This is a partial block diagram of the electronic device provided in Embodiment 3 of the present invention.

[0027] The attached figures are labeled as follows: Integrated heat exchange unit-1, condensing unit-10, first solenoid valve-100, second solenoid valve-101, first plate heat exchanger-102, condenser-103, evaporating unit-11, third solenoid valve-110, fourth solenoid valve-111, second plate heat exchanger-112, evaporator-113, compressor-12, gas-liquid separator-13, throttling device-14, hot water tank-2, cold water tank-3, first circulating pump-4, second circulating pump-5. Detailed Implementation

[0028] Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but may also have additional steps not included in the figures. The process can correspond to a method, function, procedure, subroutine, subroutine, etc.

[0029] It should be understood that although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit. The term "and / or" as used herein includes any and all combinations of one or more of the associated items listed.

[0030] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0031] Example 1 The specific implementation method is as follows: like Figure 1 The diagram shown is a schematic of a multi-source switchable one-machine-four-state intelligent air conditioning and hot water system provided by the present invention.

[0032] As an example, the system includes: an integrated heat exchange unit 1, a hot water tank 2, a cold water tank 3, and an intelligent controller assembly. The integrated heat exchange unit 1 integrates a condensing unit, an evaporating unit, a compressor 12, a gas-liquid separator 13, and a throttling device 14. The condensing unit includes a first solenoid valve 100, a second solenoid valve 101, a first plate heat exchanger 102, and a condenser 103. The evaporating unit includes a third solenoid valve 110, a fourth solenoid valve 111, a second plate heat exchanger 112, and an evaporator 113. One exhaust pipe of the compressor 12 is connected to the inlet of the first solenoid valve 100, and the other... The first solenoid valve 100 is connected to the inlet of the second solenoid valve 101; the outlet of the first solenoid valve 100 is connected to the refrigerant-side inlet of the first plate heat exchanger 102, and the refrigerant-side outlet of the first plate heat exchanger 102 is connected to the first end of the throttling device 14; the outlet of the second solenoid valve 101 is connected to the refrigerant-side inlet of the condenser 103, and the refrigerant-side outlet of the condenser 103 is connected to the first end of the throttling device 14; one end of the throttling device 14 is connected to the inlet of the fourth solenoid valve 111, and the other end is connected to the inlet of the third solenoid valve 110; the outlet of the third solenoid valve 110 is connected to the... The refrigerant inlet of the second plate heat exchanger 112 is connected to the refrigerant inlet of the evaporator 113 via the outlet of the fourth solenoid valve 111. The refrigerant outlet of the evaporator 113 is merged with the refrigerant outlet of the second plate heat exchanger 112 and then connected to the suction port of the compressor 12 via the gas-liquid separator 13. The condenser 103 is equipped with a first fan, and the evaporator 113 is equipped with a second fan. A first circulating pump 4 is connected in series in the pipeline connecting the condensate water side of the first plate heat exchanger 102 to the hot water tank 2, forming a closed hot water circulation loop. The second plate heat exchanger 112... A second circulation pump 5 is connected in series in the pipeline connecting the evaporation water path side and the cold water tank 3 to form a closed cold water circulation loop; the intelligent control component includes an intelligent controller and sensors connected to it; it is used to control the opening and closing of the first solenoid valve 100, the second solenoid valve 101, the third solenoid valve 110, the fourth solenoid valve 111, the first circulation pump 4, the second circulation pump 5, the first motor and the second motor based on preset control logic according to user instructions and / or sensor signals, so that the system operates in one of four working modes: air conditioning cooling and hot water heating, air conditioning heating and cold water preparation, preparation of cold and hot water, and air conditioning operation alone.

[0033] In some feasible implementations, the first plate heat exchanger 102 and the second plate heat exchanger 112 are both indirect heat exchange structures. The first plate heat exchanger 102 has a refrigerant side and a condensate side that are independent of each other, and the second plate heat exchanger 112 has a refrigerant side and an evaporation water side that are independent of each other.

[0034] In some feasible implementations, the throttling device 14 is a capillary tube or an electronic expansion valve; when the throttling device 14 is an electronic expansion valve, the electronic expansion valve is signal-connected to the intelligent controller, and the intelligent controller adjusts the opening of the electronic expansion valve according to the superheat at the outlet of the evaporator 113 to control the refrigerant flow rate; the first solenoid valve 100 and the second solenoid valve 101 are first three-way reversing valves, and the third solenoid valve 110 and the fourth solenoid valve 111 are second three-way reversing valves; or the four solenoid valves are integrated into a multi-way valve block to realize the switching of the refrigerant flow path.

[0035] Preferably, both the first plate heat exchanger 102 and the second plate heat exchanger 112 are indirect stainless steel plate heat exchangers with independent refrigerant and water sides, resulting in high heat exchange efficiency and corrosion resistance; the throttling device 14 is an electronic expansion valve connected to the intelligent controller; the first to fourth solenoid valves are two-position two-way solenoid valves, which can also be replaced by two three-way reversing valves or an integrated multi-way valve block; the first circulation pump 4 and the second circulation pump 5 are variable frequency water pumps, and the first fan of the condenser 103 and the second fan of the evaporator 113 are variable frequency axial flow fans.

[0036] In some feasible implementations, the sensors include a hot water temperature sensor installed in the hot water tank 2, a cold water temperature sensor installed in the cold water tank 3, an indoor ambient temperature sensor installed indoors, and an outdoor ambient temperature sensor installed outdoors; the intelligent controller has built-in mode judgment logic, which automatically outputs control signals to switch between the air conditioning cooling and hot water heating mode, the air conditioning heating and cold water preparation mode, the cold and hot water preparation mode, and the air conditioning stand-alone operation mode based on the comparison results of the signals from each temperature sensor and the user-set values.

[0037] Preferably, a PT1000 hot water temperature sensor is installed in the hot water tank 2, a PT1000 cold water temperature sensor is installed in the cold water tank 3, an indoor ambient temperature sensor is installed in the living room, and an outdoor ambient temperature sensor is installed next to the outdoor unit. All sensors are connected to the intelligent controller via a 485 bus.

[0038] In some feasible implementations, both the first circulating pump 4 and the second circulating pump 5 are variable frequency water pumps. The intelligent controller is further configured to adjust the speed of the first circulating pump 4 based on the temperature difference between the hot water tank 2 and the first plate heat exchanger 102, and to adjust the speed of the second circulating pump 5 based on the temperature difference between the cold water tank 3 and the second plate heat exchanger 112. Specifically, when the temperature difference between the hot water tank 2 and the first plate heat exchanger 102 is large, the intelligent controller increases the speed of the first circulating pump 4; when the temperature difference between the hot water tank 2 and the first plate heat exchanger 102 is small, the intelligent controller decreases the speed of the first circulating pump 4. Similarly, the adjustment method for the speed of the second circulating pump 5 is the same as that for the speed of the first circulating pump 4.

[0039] In some feasible implementations, the component states of the air conditioning cooling and hot water heating mode are as follows: the first solenoid valve 100 is open, the second solenoid valve 101 is closed, the third solenoid valve 110 is closed, the fourth solenoid valve 111 is open, the first circulation pump 4 is open, the second circulation pump 5 is closed, the first fan is stopped, and the second fan is started; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 12 enters the refrigerant side of the first plate heat exchanger 102 through the first solenoid valve 100 and exchanges heat with the cold water flowing into the condensate water path side of the hot water tank 2. The hot water after heat exchange flows back to the hot water tank 2. The refrigerant enters the evaporator 113 through the fourth solenoid valve 111 after passing through the throttling device 14 and exchanges heat with the air to achieve cooling. It then returns to the compressor 12 through the gas-liquid separator 13.

[0040] Preferably, when in air conditioning cooling and hot water heating mode, the operation process includes: the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 12 enters the refrigerant side of the first plate heat exchanger 102 through the first solenoid valve 100, and exchanges heat with the cold water flowing into the hot water tank 2 (it should be noted that the cold water here refers to water at room temperature). After the refrigerant releases heat, it becomes a medium-temperature and high-pressure liquid. After the cold water absorbs heat, it flows back to the hot water tank 2 to complete the hot water preparation. The medium-temperature and high-pressure liquid refrigerant is throttled and depressurized by the electronic expansion valve to a low-temperature and low-pressure gas-liquid two-phase state. It enters the evaporator 113 through the fourth solenoid valve 111 and exchanges heat with the indoor air introduced by the second fan. The refrigerant absorbs heat and becomes gaseous to achieve indoor cooling. After the gaseous refrigerant is separated by the gas-liquid separator 13, it returns to the compressor 12 to complete the cycle.

[0041] In some feasible implementations, the component states of the air conditioning heating and chilled water preparation mode are as follows: the first solenoid valve 100 is closed, the second solenoid valve 101 is open, the third solenoid valve 110 is open, the fourth solenoid valve 111 is closed, the first circulation pump 4 is closed, the second circulation pump 5 is open, the first fan is started, and the second fan is stopped; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 12 flows through the second solenoid valve 101 through the condenser 103 to exchange heat with the air to achieve heating, and then enters the throttling device 14. After depressurization, it enters the refrigerant side of the second plate heat exchanger 112 and exchanges heat with the room temperature water flowing into the evaporation water path side of the chilled water tank 3. The chilled water after heat exchange flows back to the chilled water tank 3, and the refrigerant returns to the compressor 12 through the gas-liquid separator 13.

[0042] Preferably, when in the air conditioning heating and chilled water preparation mode, the operation process includes: the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 12 enters the condenser 103 through the second solenoid valve 101, and exchanges heat with the outdoor air introduced by the first fan. The refrigerant releases heat to achieve indoor heating and becomes a medium-temperature and high-pressure liquid. The medium-temperature and high-pressure liquid refrigerant is throttled and depressurized by the electronic expansion valve to become a low-temperature and low-pressure gas-liquid two-phase state, and enters the refrigerant side of the second plate heat exchanger 112 to exchange heat with the room-temperature water flowing into the chilled water tank 3. The refrigerant absorbs heat and becomes gaseous. The room-temperature water releases heat and flows back to the chilled water tank 3 to complete the chilled water preparation. The gaseous refrigerant returns to the compressor 12 after passing through the gas-liquid separator 13 to complete the cycle.

[0043] In some feasible implementations, the component states for preparing the hot and cold water mode are as follows: the first solenoid valve 100 is open, the second solenoid valve 101 is closed, the third solenoid valve 110 is open, the fourth solenoid valve 111 is closed, the first circulation pump 4 is open, the second circulation pump 5 is open, the first fan is stopped, and the second fan is stopped; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 12 enters the refrigerant side of the first plate heat exchanger 102 through the first solenoid valve 100 and exchanges heat with the cold water flowing into the condensate side of the hot water tank 2. The hot water after heat exchange flows back to the hot water tank 2. The refrigerant enters the refrigerant side of the second plate heat exchanger 112 after passing through the throttling device 14 and exchanges heat with the room temperature water flowing into the evaporation water side of the cold water tank 3. The cold water after heat exchange flows back to the cold water tank 3. The refrigerant returns to the compressor 12 through the gas-liquid separator 13.

[0044] Preferably, in the hot and cold water preparation mode, the operation process includes: the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 12 enters the first plate heat exchanger 102 through the first solenoid valve 100, where it exchanges heat with the cold water in the hot water tank 2 to prepare hot water, and the refrigerant becomes a medium-temperature, high-pressure liquid; the low-temperature, low-pressure gas-liquid two-phase refrigerant, after being throttled and depressurized by the electronic expansion valve, enters the second plate heat exchanger 112 to exchange heat with the room-temperature water in the cold water tank 3 to prepare cold water, and the refrigerant becomes a gas; the gaseous refrigerant returns to the compressor 12 after passing through the gas-liquid separator 13 to complete the cycle. In this mode, energy circulates within the system, with no excess heat / cold energy emission, resulting in extremely high energy efficiency, suitable for off-peak electricity pricing periods or scenarios where users only need to prepare hot and cold water.

[0045] In some feasible implementations, the component states of the air conditioner in stand-alone operation mode are as follows: when the air conditioner is in cooling mode, the first solenoid valve 100 is open, the second solenoid valve 101 is closed, the third solenoid valve 110 is closed, the fourth solenoid valve 111 is open, the first circulation pump 4 is closed, the second circulation pump 5 is closed, the first fan is off, and the second fan is on; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 12 enters the refrigerant side of the first plate heat exchanger 102 through the first solenoid valve 100, without heat exchange, and after being depressurized by the throttling device 14, it enters the evaporator 113 through the fourth solenoid valve 111 to exchange heat with the air and achieve cooling. The refrigerant returns to the compressor 12 via the gas-liquid separator 13. When the air conditioner is in heating mode, the first solenoid valve 100 is closed, the second solenoid valve 101 is open, the third solenoid valve 110 is open, the fourth solenoid valve 111 is closed, the first circulation pump 4 is closed, the second circulation pump 5 is closed, the first fan is started, and the second fan is turned off. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 12 exchanges heat with the air through the condenser 103 to achieve heating. It then enters the throttling device 14, and after pressure reduction, it enters the refrigerant side of the second plate heat exchanger 112 via the third solenoid valve 110. Without heat exchange, the refrigerant returns to the compressor 12 via the gas-liquid separator 13.

[0046] Preferably, the air conditioner's stand-alone operation mode has two states: cooling and heating. This is suitable for scenarios where both the hot water tank 2 and the cold water tank 3 have reached the set temperature, or when the water tank system is malfunctioning / under maintenance. Cooling state: First solenoid valve 100 is open, second solenoid valve 101 is closed, third solenoid valve 110 is closed, fourth solenoid valve 111 is open, first circulation pump 4 is closed, second circulation pump 5 is closed, first fan is off, and second fan is on. The refrigerant does not exchange heat when passing through the first plate heat exchanger 102. After throttling and depressurization, it enters the evaporator 113 to exchange heat with the indoor air, achieving cooling and completing the cycle. Heating state: First solenoid valve 100 is closed, second solenoid valve 101 is open, third solenoid valve 110 is open, fourth solenoid valve 111 is closed, first circulation pump 4 is off, second circulation pump 5 is off, first fan is on, and second fan is off. The refrigerant exchanges heat with the outdoor air through the condenser 103 to achieve heating. After throttling and depressurization, it enters the second plate heat exchanger 112 without heat exchange, completing the cycle.

[0047] In some feasible implementations, the control logic integrated in the intelligent controller includes: The intelligent controller obtains the user-set target mode (such as cooling, heating, hot water production, etc.) or temperature requirements (such as indoor set temperature 26℃, hot water set temperature 55℃, etc.) through the human-machine interface; at the same time, it collects real-time signals through various sensors, including hot water tank temperature T1, cold water tank temperature T2, indoor ambient temperature T3, and outdoor ambient temperature T4.

[0048] The intelligent controller determines the operating mode based on preset mode judgment logic, combined with user commands and real-time temperature signals: if the user sets indoor cooling and T1 < 55℃, the air conditioning cooling and hot water heating mode is selected; if the user sets indoor heating and T2 > 15℃, the air conditioning heating and chilled water preparation mode is selected; if the user has no indoor cooling or heating needs, or it is currently a low-price period for electricity, and T1 < 55℃ and / or T2 > 15℃, the chilled water preparation mode is selected; if T1 ≥ 55℃ and T2 ≤ 15℃, or if the water tank system malfunctions / is under maintenance, the air conditioning standalone operation mode is selected.

[0049] Based on the mode judgment result, the intelligent controller outputs corresponding control signals to control the on / off state of each solenoid valve, and the start / stop / speed of the circulating pump and fan: Air conditioning cooling and hot water heating mode: Controls the first solenoid valve to open, the second solenoid valve to close, the third solenoid valve to close, and the fourth solenoid valve to open; the first circulating pump to start (speed adjusted according to the temperature difference between the hot water tank and the first plate heat exchanger); the second circulating pump to close; the first fan to stop; and the second fan to start. Air conditioning heating and chilled water preparation mode: Controls the first solenoid valve to close, the second solenoid valve to open, the third solenoid valve to open, and the fourth solenoid valve to close; the first circulating pump to close; and the second circulating pump to start (speed adjusted according to the temperature difference between the chilled water tank and the second plate heat exchanger). The first fan starts, and the second fan stops. In hot / cold water preparation mode: the first solenoid valve opens, the second solenoid valve closes, the third solenoid valve opens, and the fourth solenoid valve closes; both the first and second circulation pumps start (speed adjusted by frequency converter); both the first and second fans stop. In air conditioning standalone operation mode: in cooling mode, the first solenoid valve opens, the second solenoid valve closes, the third solenoid valve closes, and the fourth solenoid valve opens; both the first and second circulation pumps close; the first fan stops, and the second fan starts. In heating mode, the first solenoid valve closes, the second solenoid valve opens, the third solenoid valve opens, and the fourth solenoid valve closes; both the first and second circulation pumps stop; the first fan starts, and the second fan stops. Simultaneously, the intelligent controller adjusts the opening of the electronic expansion valve in real time based on the superheat at the evaporator 113 outlet, precisely controlling the refrigerant flow to ensure the system always operates at its optimal energy efficiency point.

[0050] During system operation, the intelligent controller continuously monitors the real-time signals of each temperature sensor at a 5-second cycle. When it detects that the mode switching conditions are met (such as T1≥55℃ in air conditioning cooling and hot water heating modes), it immediately returns to step S2 to re-determine the mode and outputs a new control signal to achieve seamless automatic mode switching.

[0051] In some feasible implementations, the plate heat exchanger can be replaced with a heat exchange sleeve, a shell-and-tube heat exchanger, etc.

[0052] It is worth mentioning that all modules involved in this embodiment are logical units. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovative aspects of this invention, this embodiment does not introduce units that are not closely related to solving the technical problem proposed by this invention; however, this does not mean that other units are absent from this embodiment.

[0053] Example 2 Please see Figure 2 This embodiment provides a flowchart of a control method for a multi-source switchable, four-state intelligent air conditioning and hot water system.

[0054] As an example, the method is applied to the multi-source switchable one-unit four-state intelligent air conditioning and hot water system described in Embodiment 1, and the method includes: Step S1: Obtain the target mode or temperature requirement set by the user, and obtain the real-time signals from the hot water tank temperature sensor, the cold water tank temperature sensor, and the indoor and outdoor ambient temperature sensor. Step S2: The intelligent controller determines the operating mode of the system based on the acquired signals, including: when the user needs indoor cooling and the hot water tank temperature has not reached the set value, selecting the air conditioning cooling and hot water heating mode; when the user needs indoor heating and the cold water tank temperature has not reached the set value, selecting the air conditioning heating and cold water preparation mode; when the user has no indoor cooling or heating needs but needs to prepare domestic hot water and / or cold water, or when it is during off-peak electricity pricing periods, selecting the hot and cold water preparation mode; when both the hot water tank and the cold water tank have reached the set temperature, or when the water tank system malfunctions or is under maintenance, selecting the air conditioning stand-alone operation mode. Step S3: Based on the judgment result, the intelligent controller outputs a control signal to execute the solenoid valve on / off combination, circulating pump and fan start / stop control corresponding to any mode. Any mode includes: If the mode is determined to be air conditioning cooling and hot water heating, then the first solenoid valve is opened, the second solenoid valve is closed, the third solenoid valve is closed, the fourth solenoid valve is opened, the first circulation pump is opened, the second circulation pump is closed, the first fan is stopped, and the second fan is started. If the mode is determined to be air conditioning cooling and hot water heating, then the first solenoid valve is closed, the second solenoid valve is opened, the third solenoid valve is opened, the fourth solenoid valve is closed, the first circulation pump is closed, the second circulation pump is opened, the first fan is started, and the second fan is stopped. If the system is determined to be in hot and cold water preparation mode, then the first solenoid valve is opened, the second solenoid valve is closed, the third solenoid valve is opened, the fourth solenoid valve is closed, the first circulation pump is opened, the second circulation pump is opened, the first fan is stopped, and the second fan is stopped. If the system is determined to be in standby mode, further determine whether the air conditioner is in cooling or heating mode. When in cooling mode, control the first solenoid valve to open, the second solenoid valve to close, the third solenoid valve to close, and the fourth solenoid valve to open; control the first circulation pump to close, the second circulation pump to close, the first fan to close, and the second fan to start. When in heating mode, control the first solenoid valve to close, the second solenoid valve to open, the third solenoid valve to open, and the fourth solenoid valve to close; control the first circulation pump to close, the second circulation pump to close, the first fan to start, and the second fan to close. Step S4: During system operation, continuously monitor the signals of each temperature sensor. When the mode switching condition is met, return to step S2 to realize automatic switching between modes.

[0055] It is not difficult to see that this embodiment is a method embodiment corresponding to the first embodiment, and this embodiment can be implemented in conjunction with the first embodiment. The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and will not be repeated here to reduce repetition. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the first embodiment.

[0056] Example 3 Please see Figure 3 The present invention also provides an electronic device, including: a memory and a processor; the memory stores at least one program instruction; the processor loads and executes the at least one program instruction to implement the multi-source switchable one-machine four-state intelligent air conditioning and hot water system control method provided in Embodiment 2.

[0057] The memory 702 and processor 701 are connected via a bus, which may include any number of interconnecting buses and bridges, connecting various circuits of one or more processors 701 and memory 702 together. The bus may also connect various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver may be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by processor 701 is transmitted over a wireless medium via an antenna, which further receives data and transmits it to processor 701.

[0058] Processor 701 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory 702 can be used to store data used by processor 701 during operation.

[0059] Example 4 This invention also proposes a storage medium storing a control method for a multi-source switchable four-state intelligent air conditioning and hot water system. When the control program for the multi-source switchable four-state intelligent air conditioning and hot water system is executed by a processor, it implements the steps of the control method described above. Since this storage medium employs all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0060] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A multi-source, switchable, four-state intelligent air conditioning and hot water system, characterized in that, The system includes: an integrated heat exchange host (1), a hot water tank (2), a cold water tank (3) and an intelligent controller assembly. The integrated heat exchange host (1) integrates a condensing unit, an evaporating unit, a compressor (12), a gas-liquid separator (13) and a throttling device (14). The condensing unit includes a first solenoid valve (100), a second solenoid valve (101), a first plate heat exchanger (102), and a condenser (103); the evaporating unit includes a third solenoid valve (110), a fourth solenoid valve (111), a second plate heat exchanger (112), and an evaporator (113). The compressor (12) has its exhaust pipe connected in one direction to the inlet of the first solenoid valve (100) and in another direction to the inlet of the second solenoid valve (101). The outlet of the first solenoid valve (100) is connected to the refrigerant-side inlet of the first plate heat exchanger (102), and the refrigerant-side outlet of the first plate heat exchanger (102) is connected to the first end of the throttling device (14). The outlet of the second solenoid valve (101) is connected to the refrigerant-side inlet of the condenser (103), and the refrigerant-side outlet of the condenser (103) is connected to the first end of the throttling device (14). The second end of the throttling device (14) is connected in one direction to the inlet of the first solenoid valve (100). The inlet of the fourth solenoid valve (111) is connected to the inlet of the third solenoid valve (110); the outlet of the third solenoid valve (110) is connected to the refrigerant side inlet of the second plate heat exchanger (112); the outlet of the fourth solenoid valve (111) is connected to the refrigerant side inlet of the evaporator (113); the refrigerant side outlet of the evaporator (113) and the refrigerant side outlet of the second plate heat exchanger (112) are merged and then connected to the suction port of the compressor (12) via the gas-liquid separator (13); the condenser (103) is equipped with a first fan, and the evaporator (113) is equipped with a second fan. A first circulating pump (4) is connected in series in the pipeline connecting the condensate water side of the first plate heat exchanger (102) to the hot water tank (2), forming a closed hot water circulation loop; a second circulating pump (5) is connected in series in the pipeline connecting the evaporation water side of the second plate heat exchanger (112) to the cold water tank (3), forming a closed cold water circulation loop. The intelligent control component includes an intelligent controller and sensors connected to it; it is used to control the opening and closing of the first solenoid valve (100), the second solenoid valve (101), the third solenoid valve (110), the fourth solenoid valve (111), the first circulating pump (4), the second circulating pump (5), the first motor and the second motor based on preset control logic according to user instructions and / or sensor signals, so that the system operates in one of four working modes: air conditioning cooling and hot water heating, air conditioning heating and cold water preparation, preparation of cold and hot water, and air conditioning operating alone.

2. The multi-source switchable four-state intelligent air conditioning and hot water system according to claim 1, characterized in that, The first plate heat exchanger (102) and the second plate heat exchanger (112) are both indirect heat exchange structures. The first plate heat exchanger (102) has a refrigerant side and a condensate side that are independent of each other, and the second plate heat exchanger (112) has a refrigerant side and an evaporation water side that are independent of each other.

3. The multi-source switchable four-state intelligent air conditioning and hot water system according to claim 1, characterized in that, The throttling device (14) is a capillary tube or an electronic expansion valve; when the throttling device (14) is an electronic expansion valve, the electronic expansion valve is connected to the intelligent controller, and the intelligent controller adjusts the opening of the electronic expansion valve according to the superheat at the outlet of the evaporator (113) to control the refrigerant flow rate. The first solenoid valve (100) and the second solenoid valve (101) are first three-way reversing valves, and the third solenoid valve (110) and the fourth solenoid valve (111) are second three-way reversing valves; or the four solenoid valves are integrated into a multi-way valve block to realize the switching of refrigerant flow path.

4. The multi-source switchable four-state intelligent air conditioning and hot water system according to claim 1, characterized in that, The sensors include a hot water temperature sensor installed in the hot water tank (2), a cold water temperature sensor installed in the cold water tank (3), an indoor ambient temperature sensor installed indoors, and an outdoor ambient temperature sensor installed outdoors. The intelligent controller has a built-in mode judgment logic. Based on the comparison results of the signals from each temperature sensor and the user-set values, it automatically outputs control signals to switch between the air conditioning cooling and hot water heating modes, the air conditioning heating and cold water preparation modes, the cold and hot water preparation modes, and the air conditioning stand-alone operation modes.

5. The multi-source switchable one-unit four-state intelligent air conditioning and hot water system according to claim 4, characterized in that, Both the first circulating pump (4) and the second circulating pump (5) are variable frequency water pumps. The intelligent controller is also used to adjust the speed of the first circulating pump (4) according to the temperature difference between the hot water tank (2) and the first plate heat exchanger (102), and to adjust the speed of the second circulating pump (5) according to the temperature difference between the cold water tank (3) and the second plate heat exchanger (112).

6. The multi-source switchable four-state intelligent air conditioning and hot water system according to claim 1, characterized in that, The component states of the air conditioning cooling and hot water heating mode are as follows: the first solenoid valve (100) is open, the second solenoid valve (101) is closed, the third solenoid valve (110) is closed, the fourth solenoid valve (111) is open, the first circulation pump (4) is open, the second circulation pump (5) is closed, the first fan is stopped, and the second fan is started; the high temperature and high pressure gaseous refrigerant discharged by the compressor (12) enters the refrigerant side of the first plate heat exchanger (102) through the first solenoid valve (100) and exchanges heat with the cold water flowing into the condensate water path side of the hot water tank (2). The hot water after heat exchange flows back to the hot water tank (2). The refrigerant enters the evaporator (113) through the fourth solenoid valve (111) after passing through the throttling device (14) to exchange heat with the air and achieve cooling. It then returns to the compressor (12) through the gas-liquid separator (13).

7. The multi-source switchable four-state intelligent air conditioning and hot water system according to claim 1, characterized in that, The component states of the air conditioning heating and chilled water preparation mode are as follows: the first solenoid valve (100) is closed, the second solenoid valve (101) is open, the third solenoid valve (110) is open, the fourth solenoid valve (111) is closed, the first circulation pump (4) is closed, the second circulation pump (5) is open, the first fan is started, and the second fan is stopped; the high temperature and high pressure gaseous refrigerant discharged by the compressor (12) flows through the second solenoid valve (101) through the condenser (103) to exchange heat with the air to achieve heating, and then enters the throttling device (14), and after pressure reduction, it enters the refrigerant side of the second plate heat exchanger (112) and exchanges heat with the room temperature water on the evaporation water path side of the chilled water tank (3). The chilled water after heat exchange flows back to the chilled water tank (3), and the refrigerant returns to the compressor (12) through the gas-liquid separator (13).

8. The multi-source switchable four-state intelligent air conditioning and hot water system according to claim 1, characterized in that, The component states for preparing the hot and cold water mode are as follows: the first solenoid valve (100) is open, the second solenoid valve (101) is closed, the third solenoid valve (110) is open, the fourth solenoid valve (111) is closed, the first circulation pump (4) is open, the second circulation pump (5) is open, the first fan is stopped, and the second fan is stopped; the high-temperature and high-pressure gaseous refrigerant discharged by the compressor (12) enters the refrigerant side of the first plate heat exchanger (102) through the first solenoid valve (100) and exchanges heat with the cold water flowing into the condensate side of the first plate heat exchanger (102) from the hot water tank (2), and the hot water after heat exchange flows back to the hot water tank (2). The refrigerant enters the refrigerant side of the second plate heat exchanger (112) after passing through the throttling device (14) and exchanges heat with the room temperature water flowing into the evaporation water side of the second plate heat exchanger (112) from the cold water tank (3), and the cold water after heat exchange flows back to the cold water tank (3). The refrigerant returns to the compressor (12) through the gas-liquid separator (13).

9. The multi-source switchable four-state intelligent air conditioning and hot water system according to claim 1, characterized in that, The component status of the air conditioner in stand-alone operation mode is as follows: When the air conditioner is in cooling mode, the first solenoid valve (100) is open, the second solenoid valve (101) is closed, the third solenoid valve (110) is closed, the fourth solenoid valve (111) is open, the first circulation pump (4) is closed, the second circulation pump (5) is closed, the first fan is turned off, and the second fan is started. The high-temperature and high-pressure gaseous refrigerant discharged by the compressor (12) enters the refrigerant side of the first plate heat exchanger (102) through the first solenoid valve (100), without heat exchange. After being depressurized by the throttling device (14), it enters the evaporator (113) through the fourth solenoid valve (111) to exchange heat with the air and achieve cooling. The refrigerant returns to the compressor (12) through the gas-liquid separator (13). When the air conditioner is in heating mode, the first solenoid valve (100) is closed, the second solenoid valve (101) is open, the third solenoid valve (110) is open, the fourth solenoid valve (111) is closed, the first circulation pump (4) is closed, the second circulation pump (5) is closed, the first fan is started, and the second fan is closed. The high-temperature and high-pressure gaseous refrigerant discharged by the compressor (12) exchanges heat with the air through the condenser (103) to achieve heating. It enters the throttling device (14), and after pressure reduction, it enters the refrigerant side of the second plate heat exchanger (112) through the third solenoid valve (110). No heat exchange is performed. The refrigerant returns to the compressor (12) through the gas-liquid separator (13).

10. A control method for a multi-source switchable, four-state intelligent air conditioning and hot water system, characterized in that, The method is applied to the multi-source switchable one-unit four-state intelligent air conditioning and hot water system according to any one of claims 1-9, and the method includes: Step S1: Obtain the target mode or temperature requirement set by the user, and obtain the real-time signals from the hot water tank temperature sensor, the cold water tank temperature sensor, and the indoor and outdoor ambient temperature sensor. Step S2: The intelligent controller determines the operating mode of the system based on the acquired signals, including: when the user needs indoor cooling and the hot water tank temperature has not reached the set value, selecting the air conditioning cooling and hot water heating mode; when the user needs indoor heating and the cold water tank temperature has not reached the set value, selecting the air conditioning heating and cold water preparation mode; when the user has no indoor cooling or heating needs but needs to prepare domestic hot water and / or cold water, or when it is during off-peak electricity pricing periods, selecting the hot and cold water preparation mode; when both the hot water tank and the cold water tank have reached the set temperature, or when the water tank system malfunctions or is under maintenance, selecting the air conditioning stand-alone operation mode. Step S3: Based on the judgment result, the intelligent controller outputs a control signal to execute the solenoid valve on / off combination, circulating pump and fan start / stop control corresponding to any mode. Any mode includes: If the mode is determined to be air conditioning cooling and hot water heating, then the first solenoid valve is opened, the second solenoid valve is closed, the third solenoid valve is closed, the fourth solenoid valve is opened, the first circulation pump is opened, the second circulation pump is closed, the first fan is stopped, and the second fan is started. If the mode is determined to be air conditioning cooling and hot water heating, then the first solenoid valve is closed, the second solenoid valve is opened, the third solenoid valve is opened, the fourth solenoid valve is closed, the first circulation pump is closed, the second circulation pump is opened, the first fan is started, and the second fan is stopped. If the system is determined to be in hot and cold water preparation mode, then the first solenoid valve is opened, the second solenoid valve is closed, the third solenoid valve is opened, the fourth solenoid valve is closed, the first circulation pump is opened, the second circulation pump is opened, the first fan is stopped, and the second fan is stopped. If the system is determined to be in standby mode, further determine whether the air conditioner is in cooling or heating mode. When in cooling mode, control the first solenoid valve to open, the second solenoid valve to close, the third solenoid valve to close, and the fourth solenoid valve to open; control the first circulation pump to close, the second circulation pump to close, the first fan to close, and the second fan to start. When in heating mode, control the first solenoid valve to close, the second solenoid valve to open, the third solenoid valve to open, and the fourth solenoid valve to close; control the first circulation pump to close, the second circulation pump to close, the first fan to start, and the second fan to close. Step S4: During system operation, continuously monitor the signals of each temperature sensor. When the mode switching condition is met, return to step S2 to realize automatic switching between modes.

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