Cooling, heating and domestic hot water multi-supply efficient heat pump

Abstract

The utility model discloses a cooling, heating and domestic hot water multi-combined supply efficient heat pump, which comprises an air-conditioning side system and a water side system, the water side system is connected with the air-conditioning side system, the water side system is connected with a combined control switch module, the use requirements of cooling / heating and domestic hot water can be simultaneously met through a set of heat pump equipment, and meanwhile, the heat pump equipment can be used for heating and domestic hot water supply. And in transition seasons and when no air conditioner cooling and heating requirements exist, the equipment can be used for making domestic hot water, the requirements of users for cooling and heating at different times and in different scenes are met, the equipment utilization rate is increased, and the initial equipment investment of the users is reduced.

Description

Technical Field

[0001] The utility model discloses a heat pump, in particular to a high-efficiency heat pump for combined cooling, heating and domestic hot water supply, belonging to the technical field of heat pumps, and relates to a control method, a device and a heat pump for combined cooling, heating and domestic hot water supply. Background Art

[0002] At present, heat pump technology has been widely used in various fields of social production and life. Heat pump air conditioners, heat pump water heaters, heat pump dryers, car heat pumps and other heat pump products meet people's different needs. At present, the air conditioners we can see on the market are basically heat pump products, but most of them can only meet the single demand of cooling / heating at the same time. If you want to use hot water, you need to add additional hot water equipment, such as boilers, electric water heaters, heat pump water heaters, etc. Even if a small number of heat pump air conditioners can produce a small amount of hot water while cooling or heating, they cannot be widely used because of the small amount of hot water produced, high energy consumption, poor reliability and other reasons. Moreover, in transitional seasons, such as late spring and early autumn, the temperature is suitable and users have no need to use air conditioners. At this time, the air conditioner can only be idle. Therefore, for most users, in order to solve the needs of cooling / heating + domestic hot water at the same time, at least two sets of equipment are needed. Air conditioning equipment and hot water equipment not only increase the investment in purchasing equipment, but also occupy limited space for installing multiple sets of equipment.

[0003] A gas heat pump is an equipment system that uses a gas engine to drive a compressor to achieve a refrigeration / heating cycle. The mechanical efficiency of the engine driving the compressor is only about 35%, and the remaining 65% of the energy exists in the form of heat. Through waste heat recovery, this heat can be used to produce hot water. Currently, there are gas heat pumps on the market that can produce domestic hot water while achieving refrigeration / heating. However, when there is no demand for refrigeration or heating, domestic hot water cannot be produced, and the problem of idle equipment during transitional seasons cannot be solved. Summary of the invention

[0004] In view of the fact that the gas heat pump in the prior art mentioned above cannot produce domestic hot water when there is no cooling or heating demand, and cannot solve the problem of equipment idleness in transitional seasons, the utility model provides a high-efficiency heat pump for multi-supply of cooling, heating and domestic hot water. Through a set of heat pump equipment, it can realize free switching among five operating modes: cooling, heating, cooling + domestic hot water, heating + domestic hot water, and pure domestic hot water.

[0005] The utility model solves the technical problem by adopting a technical solution: a high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water, the high-efficiency heat pump comprises an air-conditioning side system and a water-side system, the water-side system is connected to the air-conditioning side system, and a combined control switch module is connected to the water-side system.

[0006] The air conditioning side system includes a gas engine, a compressor, an oil separator, a four-way valve, a first heat exchanger, an outdoor fin heat exchanger and a gas-liquid separator. The compressor is connected to the gas engine, and the gas engine drives the compressor to work. The refrigerant output end of the compressor is connected to the input end of the oil separator, and the refrigerant output end of the oil separator is connected to the outdoor fin heat exchanger through the four-way valve, and the output end of the outdoor fin heat exchanger is connected to the first heat exchanger. The refrigerant output end of the first heat exchanger is connected to the gas-liquid separator through the four-way valve, and the output end of the gas-liquid separator is connected to the input end of the compressor;

[0007] The water side system includes a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a thermostat T1, a thermostat T2, a thermostat T3, a cooling water pump and a radiator. The first heat exchanger is connected in parallel with the second heat exchanger. The total chilled water inlet pipe is divided into two and connected to the chilled water inlet ends of the first heat exchanger and the second heat exchanger respectively. The total chilled water outlet pipe is divided into two and connected to the chilled water outlet ends of the first heat exchanger and the second heat exchanger respectively. The chilled water inlet end of the second heat exchanger is connected with a solenoid valve SV10. The cooling water output end of the gas engine is connected with a thermostat T1. The output end of the thermostat T1 is divided into two paths, one of which is connected to the The third heat exchanger is connected, and the other is connected to the thermostat T2. The output end of the thermostat T2 is divided into two paths, one of which is connected to the radiator cap, and the other is connected to an input end of the thermostat T3. The other input end of the thermostat T3 is connected to the second heat exchanger. The output end of the thermostat T3 is connected to the first filter. The output end of the first filter is connected to the input end of the cooling water pump. The output end of the cooling water pump is connected to the cooling water input end of the fourth heat exchanger. The cooling water output end of the fourth heat exchanger is connected to the cooling water input end of the gas engine. The exhaust gas output end of the gas engine is connected to the exhaust gas input end of the fourth heat exchanger.

[0008] A chilled water pump is connected to the chilled water inlet pipeline, and the output end of the chilled water pump is connected to the solenoid valve HSV1, and the output end of the solenoid valve HSV1 is connected to the one-way valve HCV1. The output of the one-way valve HCV1 is divided into two paths, one of which is connected to the chilled water input end of the second heat exchanger through the solenoid valve SV10, and the other is connected to the chilled water input end of the first heat exchanger. The chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger are combined and connected to the solenoid valve HSV2, and the output end of the solenoid valve HSV2 is connected to the chilled water flow switch, and the output end of the chilled water flow switch is connected to the chilled water outlet pipeline;

[0009] A domestic hot water pump is connected to the domestic hot water inlet pipeline, the output end of the domestic hot water pump is connected to the solenoid valve HSV5, the output end of the solenoid valve HSV5 is connected to the chilled water input end of the third heat exchanger, the chilled water output end of the third heat exchanger is connected to the domestic hot water flow switch, and the output end of the domestic hot water flow switch is connected to the domestic hot water outlet pipeline.

[0010] The technical solution adopted by the utility model to solve its technical problems further includes:

[0011] There are two compressors, namely the first compressor and the second compressor. The gas engine drives the two compressors to work simultaneously through a belt. The first compressor output end pipeline is connected to the first high-temperature temperature sensor Tp1, the second compressor output end pipeline is connected to the second high-temperature temperature sensor Tp2, the first compressor and the second compressor input end pipelines are connected to the low-temperature temperature sensor Th, the high-pressure pressure sensor PH is connected to the pipeline between the oil separator and the four-way valve, and the low-pressure pressure sensor PL is connected to the pipeline between the gas-liquid separator and the compressor.

[0012] The output end of the outdoor fin heat exchanger is divided into two paths, the first path is connected to the first heat exchanger through the electronic expansion valve EXV1A, and the second path is connected to the first heat exchanger through the electronic expansion valve EXV1B.

[0013] An air-conditioning water outlet temperature sensor Two is connected to the air-conditioning water outlet end of the first heat exchanger, and an air-conditioning water inlet temperature sensor Twi is connected to the air-conditioning water inlet end of the first heat exchanger.

[0014] A temperature sensor Th2 is connected to the pipeline between the four-way valve and the gas-liquid separator.

[0015] A manual drain pipe is connected to the pipeline formed by merging the chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger, and a manual ball valve HSV8 is provided on the manual drain pipe; an automatic drain pipe is connected to the pipeline formed by merging the chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger, and a solenoid valve HSV7 is provided on the automatic drain pipe.

[0016] A solenoid valve HSV6 is connected between the domestic hot water inlet pipeline and the domestic hot water outlet pipeline.

[0017] The domestic hot water inlet pipeline is connected with a solenoid valve HSV3, the output end of the solenoid valve HSV3 is connected to a supplementary water flow switch, the output end of the supplementary water flow switch is connected to a one-way valve HCV2, and the output end of the one-way valve HCV2 is connected to the chilled water inlet pipeline.

[0018] The chilled water outlet pipeline is connected with a solenoid valve HSV4, the output end of the solenoid valve HSV4 is connected with a one-way valve HCV3, and the output end of the one-way valve HCV3 is connected with the domestic hot water outlet pipeline.

[0019] The radiator cover is connected with a water storage tank.

[0020] The beneficial effects of the utility model are as follows: the utility model can realize a set of heat pump system to meet various cooling and heating needs, can be freely switched among 5 operating modes, and has an automatic sewage discharge mode to prevent the mixing of air-conditioning water and domestic hot water, providing clean and hygienic domestic hot water.

[0021] The utility model can meet the needs of cooling / heating + domestic hot water at the same time through a set of heat pump equipment. At the same time, the equipment can also be used to produce domestic hot water in transition seasons when there is no demand for air conditioning and heating, thereby meeting the user's needs for cooling and heating at different times and in different scenarios, improving the utilization rate of the equipment and reducing the user's initial investment in the equipment.

[0022] The utility model is based on a steam compression gas heat pump system. Through the efficient coupling utilization of the air source and the engine waste heat and the system piping design, a multi-energy efficient heat pump is realized which can freely switch among five operating modes: cooling, heating, cooling + domestic hot water, heating + domestic hot water, and pure domestic hot water.

[0023] The utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the principle diagram of the multi-energy high-efficiency heat pump air-conditioning side system in the utility model.

[0025] Figure 2 This is the schematic diagram of the water side system of the multi-energy high-efficiency heat pump in the utility model. DETAILED DESCRIPTION

[0026] This embodiment is a preferred implementation mode of the utility model. Other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the utility model.

[0027] Please see attached Figure 1 and attached Figure 2 The utility model mainly protects a high-efficiency heat pump for multi-supply of cooling, heating and domestic hot water, which mainly includes an air-conditioning side system and a water side system. The air-conditioning side system belongs to an air-cooled air source heat pump system. The engine drives the compressor to compress the refrigerant medium for circulation to achieve cooling and heating. The water side system is mainly the air-conditioning water and domestic hot water operation part. The water side system is connected to the air-conditioning side system, and a combined control switch module is connected to the water side system.

[0028] In this embodiment, the air-conditioning side system includes a gas engine, a compressor, an oil separator, a four-way valve, a first heat exchanger, an outdoor fin heat exchanger and a gas-liquid separator. The compressor is connected to the gas engine and driven by the gas engine to work. The refrigerant output end of the compressor is connected to the input end of the oil separator. The refrigerant output end of the oil separator is connected to the outdoor fin heat exchanger through the four-way valve. The output end of the outdoor fin heat exchanger is connected to the refrigerant input end of the first heat exchanger. The refrigerant output end of the first heat exchanger is connected to the gas-liquid separator through the four-way valve, and the output end of the gas-liquid separator is connected to the input end of the compressor.

[0029] In this embodiment, two compressors are provided, namely, a first compressor and a second compressor. The gas engine drives the two compressors to work simultaneously through a belt. A first high-temperature temperature sensor Tp1 is connected to the pipeline at the output end of the first compressor, a second high-temperature temperature sensor Tp2 is connected to the pipeline at the output end of the second compressor, a low-temperature temperature sensor Th is connected to the pipeline at the input end of the first compressor and the second compressor, a high-pressure pressure sensor PH is connected to the pipeline between the oil separator and the four-way valve, and a low-pressure pressure sensor PL is connected to the pipeline between the gas-liquid separator and the compressor.

[0030] In this embodiment, the output end of the outdoor fin heat exchanger is divided into two paths, the first path is connected to the first heat exchanger through the electronic expansion valve EXV1A, and the second path is connected to the first heat exchanger through the electronic expansion valve EXV1B.

[0031] In this embodiment, an air-conditioning water outlet temperature sensor Two is connected to the air-conditioning water outlet end of the first heat exchanger, and an air-conditioning water inlet temperature sensor Twi is connected to the air-conditioning water inlet end of the first heat exchanger.

[0032] In this embodiment, a temperature sensor Th2 is connected to the pipeline between the four-way valve and the gas-liquid separator.

[0033] In this embodiment, the water side system includes a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a thermostat T1, a thermostat T2, a thermostat T3, a cooling water pump and a radiator. The first heat exchanger is connected in parallel with the second heat exchanger. The total chilled water inlet pipe is divided into two and connected to the chilled water inlet ends of the first heat exchanger and the second heat exchanger respectively. The total chilled water outlet pipe is divided into two and connected to the chilled water outlet ends of the first heat exchanger and the second heat exchanger respectively. The chilled water inlet end of the second heat exchanger is connected to a solenoid valve SV10. The cooling water output end of the gas engine is connected to the thermostat T1. The output end of the thermostat T1 is divided into two paths. One path is connected to the third heat exchanger, and the other path is connected to the thermostat T2. The output end of the thermostat T2 is divided into two paths, one path is connected to the radiator cap, and the other path is connected to one input end of the thermostat T3. The other input end of the thermostat T3 is connected to the second heat exchanger. The output end of the thermostat T3 is connected to the first filter, the output end of the first filter is connected to the input end of the cooling water pump, the output end of the cooling water pump is connected to the cooling water input end of the fourth heat exchanger, the cooling water output end of the fourth heat exchanger is connected to the cooling water input end of the gas engine, and the exhaust gas output end of the gas engine is connected to the exhaust gas input end of the fourth heat exchanger.

[0034] In this embodiment, a chilled water pump is connected to the chilled water inlet pipeline, and chilled water is pumped into the system through the chilled water pump. The output end of the chilled water pump is connected to the solenoid valve HSV1, and the output end of the solenoid valve HSV1 is connected to the one-way valve HCV1. The output of the one-way valve HCV1 is divided into two paths, one path is connected to the chilled water input end of the second heat exchanger through the solenoid valve SV10, and the other path is connected to the chilled water input end of the first heat exchanger. The chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger are combined and connected to the solenoid valve HSV2, and the output end of the solenoid valve HSV2 is connected to the chilled water flow switch, and the output end of the chilled water flow switch is connected to the chilled water outlet pipeline.

[0035] In this embodiment, a manual drain pipe is connected to the pipeline formed by merging the chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger, and a manual ball valve HSV8 is provided on the manual drain pipe; an automatic drain pipe is connected to the pipeline formed by merging the chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger, and a solenoid valve HSV7 is provided on the automatic drain pipe.

[0036] In this embodiment, a domestic hot water pump is connected to the domestic hot water inlet pipe, and domestic hot water is pumped into the system through the domestic hot water pump. The output end of the domestic hot water pump is connected to the solenoid valve HSV5, and the output end of the solenoid valve HSV5 is connected to the chilled water input end of the third heat exchanger, and the chilled water output end of the third heat exchanger is connected to the domestic hot water flow switch, and the output end of the domestic hot water flow switch is connected to the domestic hot water outlet pipe.

[0037] In this embodiment, a solenoid valve HSV6 is connected between the domestic hot water inlet pipeline and the domestic hot water outlet pipeline.

[0038] In this embodiment, a solenoid valve HSV3 is connected to the domestic hot water inlet pipeline, the output end of the solenoid valve HSV3 is connected to the supplementary water flow switch, the output end of the supplementary water flow switch is connected to the one-way valve HCV2, and the output end of the one-way valve HCV2 is connected to the chilled water inlet pipeline.

[0039] In this embodiment, a solenoid valve HSV4 is connected to the chilled water outlet pipeline, an output end of the solenoid valve HSV4 is connected to the one-way valve HCV3, and an output end of the one-way valve HCV3 is connected to the domestic hot water outlet pipeline.

[0040] In this embodiment, a water storage tank is connected to the radiator cap, which can be used to replenish cooling water in the system.

[0041] The utility model can realize the free switching of five operation modes of gas heat pump: refrigeration, heating, refrigeration + domestic hot water, heating + domestic hot water, and pure domestic hot water.

[0042] (1) Cooling mode operation control logic:

[0043] Startup: When the system receives the startup command, solenoid valves HSV1 and HSV2 open, and the other solenoid valves are closed. After 10 seconds, the system runs according to the conventional gas heat pump refrigeration startup sequence.

[0044] Shutdown: The system follows the conventional gas heat pump refrigeration shutdown timing control. 30 seconds after the chilled water pump is turned off, the solenoid valve HSV1 and the solenoid valve HSV2 are closed.

[0045] (2) Heating mode operation control logic:

[0046] Startup: When the system receives the startup command, solenoid valves HSV1, HSV2 and SV10 are opened, and the other solenoid valves are closed. After 10 seconds, the system starts and operates according to the conventional gas heat pump heating method.

[0047] Shutdown: The system follows the conventional gas heat pump heating shutdown timing control. 30 seconds after the chilled water pump is turned off, the solenoid valves HSV1, HSV2 and SV10 are closed.

[0048] (3) Cooling + domestic hot water mode operation control logic:

[0049] Startup: When the air conditioning module is operating in cooling / heating mode, turn on the hot water mode, and the air conditioning system operates in the above cooling / heating mode. When the system receives the hot water mode start-up command, when the first compressor runs, the solenoid valve HSV5 opens, and after 10 seconds the domestic hot water pump LIFE-PUMP starts.

[0050] Shutdown: The air conditioning module operates in the above cooling / heating mode. When the system receives the hot water mode shutdown command, the domestic hot water pump LIFE-PUMP is shut down after 120 seconds. 30 seconds after the domestic hot water pump LIFE-PUMP is shut down, the solenoid valve HSV5 is closed.

[0051] (4) Heating + domestic hot water mode operation control logic:

[0052] Startup: When the air conditioning module is operating in cooling / heating mode, turn on the hot water mode, and the air conditioning system operates in the above cooling / heating mode. When the system receives the hot water mode start-up command, when the first compressor runs, the solenoid valve HSV5 opens, and after 10 seconds the domestic hot water pump LIFE-PUMP starts.

[0053] Shutdown: The air conditioning module operates in the above cooling / heating mode. When the system receives the hot water mode shutdown command, the domestic hot water pump LIFE-PUMP is shut down after 120 seconds. 30 seconds after the domestic hot water pump LIFE-PUMP is shut down, the solenoid valve HSV5 is closed.

[0054] (5) Operation control logic of pure domestic hot water mode:

[0055] Startup: After receiving the start-up command of the hot water module, the system first performs an automatic sewage discharge mode test. After exiting the automatic sewage discharge mode, it enters the pure hot water production mode: solenoid valves HSV3, HSV4, HSV5 and SV10 are opened, and the chilled water pump CYC-PUMP does not start. After 10 seconds, the domestic hot water pump LIFE-PUMP starts. Except that the chilled water pump CYC-PUMP still does not start, the air-conditioning system starts and operates according to the conventional gas heat pump heating method.

[0056] Shutdown: The system receives the shutdown command from the hot water module, and the air-conditioning system is controlled according to the conventional gas heat pump heating shutdown timing. 120 seconds after the engine is shut down, the domestic hot water pump LIFE-PUMP is shut down. 30 seconds after the domestic hot water pump is shut down, the solenoid valves HSV3, HSV4, HSV5 and SV10 are closed.

[0057] The automatic sewage discharge mode described in the utility model refers to the process of cleaning and draining the pipeline through the domestic hot water source in order to prevent the mixing of air-conditioning water and domestic hot water and contamination of domestic hot water during the switching process of pipeline valves and ensure the hygiene and cleanliness of domestic hot water when running the pure domestic hot water mode. Therefore, when the system switches from cooling, heating, cooling + hot water, heating + hot water mode to pure hot water mode, or the system is turned on from standby or shutdown state to run pure hot water mode, but the last operating mode was cooling, heating, cooling + hot water, heating + hot water mode, anti-freezing heating mode, then before the system runs in hot water mode, the system must first perform the automatic sewage discharge mode.

[0058] Automatic sewage discharge mode operation control logic:

[0059] Solenoid valves HSV3, HSV7 and SV10 are opened. After 10 seconds, the domestic hot water pump LIFE-PUMP starts and runs continuously for 7 minutes. Then the unit exits the automatic sewage discharge mode and the domestic hot water pump LIFE-PUMP is turned off. After 10 seconds, the solenoid valve HSV7 is closed, and then the unit is turned on and enters the pure domestic hot water mode.

[0060] If the last operating state of the unit was also in pure domestic hot water mode, the system will not enter the automatic sewage discharge mode and directly enter the pure domestic hot water mode.

[0061] In addition to the automatic sewage discharge mode, the utility model also designs a manual sewage discharge valve HSV8, which is used to manually open the manual sewage discharge valve HSV8 to discharge sewage from the system pipeline or release water in the pipeline at the initial stage of project installation or when the equipment needs to be disassembled.

[0062] The utility model can realize a set of heat pump system to meet various cooling and heating needs, can freely switch among 5 operating modes, and has an automatic sewage discharge mode to prevent the mixing of air-conditioning water and domestic hot water, thereby providing clean and hygienic domestic hot water.

[0063] The utility model can meet the needs of cooling / heating + domestic hot water at the same time through a set of heat pump equipment. At the same time, the equipment can also be used to produce domestic hot water in transition seasons when there is no demand for air conditioning and heating, thereby meeting the user's needs for cooling and heating at different times and in different scenarios, improving the utilization rate of the equipment and reducing the user's initial investment in the equipment.

[0064] The utility model is based on a steam compression gas heat pump system. Through the efficient coupling utilization of the air source and the engine waste heat and the system piping design, a multi-energy efficient heat pump is realized which can freely switch among five operating modes: cooling, heating, cooling + domestic hot water, heating + domestic hot water, and pure domestic hot water.

Claims

1. A high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water, characterized by: The high-efficiency heat pump comprises an air-conditioning side system and a water-side system. The water-side system is connected to the air-conditioning side system. A combined control switch module is connected to the water-side system. The air conditioning side system includes a gas engine, a compressor, an oil separator, a four-way valve, a first heat exchanger, an outdoor fin heat exchanger and a gas-liquid separator. The compressor is connected to the gas engine, and the gas engine drives the compressor to work. The refrigerant output end of the compressor is connected to the input end of the oil separator, and the refrigerant output end of the oil separator is connected to the outdoor fin heat exchanger through the four-way valve. The output end of the outdoor fin heat exchanger is connected to the refrigerant input end of the first heat exchanger. The refrigerant output end of the first heat exchanger is connected to the gas-liquid separator through the four-way valve, and the output end of the gas-liquid separator is connected to the input end of the compressor; The water side system includes a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a thermostat T1, a thermostat T2, a thermostat T3, a cooling water pump and a radiator. The first heat exchanger is connected in parallel with the second heat exchanger. The total chilled water inlet pipe is divided into two and connected to the chilled water inlet ends of the first heat exchanger and the second heat exchanger respectively. The total chilled water outlet pipe is divided into two and connected to the chilled water outlet ends of the first heat exchanger and the second heat exchanger respectively. The chilled water inlet end of the second heat exchanger is connected with a solenoid valve SV10. The cooling water output end of the gas engine is connected with a thermostat T1. The output end of the thermostat T1 is divided into two paths, one of which is connected to the The third heat exchanger is connected, and the other is connected to the thermostat T2. The output end of the thermostat T2 is divided into two paths, one of which is connected to the radiator cap, and the other is connected to an input end of the thermostat T3. The other input end of the thermostat T3 is connected to the second heat exchanger. The output end of the thermostat T3 is connected to the first filter. The output end of the first filter is connected to the input end of the cooling water pump. The output end of the cooling water pump is connected to the cooling water input end of the fourth heat exchanger. The cooling water output end of the fourth heat exchanger is connected to the cooling water input end of the gas engine. The exhaust gas output end of the gas engine is connected to the exhaust gas input end of the fourth heat exchanger. A chilled water pump is connected to the chilled water inlet pipeline, and the output end of the chilled water pump is connected to the solenoid valve HSV1, and the output end of the solenoid valve HSV1 is connected to the one-way valve HCV1. The output of the one-way valve HCV1 is divided into two paths, one of which is connected to the chilled water input end of the second heat exchanger through the solenoid valve SV10, and the other is connected to the chilled water input end of the first heat exchanger. The chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger are combined and connected to the solenoid valve HSV2, and the output end of the solenoid valve HSV2 is connected to the chilled water flow switch, and the output end of the chilled water flow switch is connected to the chilled water outlet pipeline; A domestic hot water pump is connected to the domestic hot water inlet pipeline, the output end of the domestic hot water pump is connected to the solenoid valve HSV5, the output end of the solenoid valve HSV5 is connected to the chilled water input end of the third heat exchanger, the chilled water output end of the third heat exchanger is connected to the domestic hot water flow switch, and the output end of the domestic hot water flow switch is connected to the domestic hot water outlet pipeline.

2. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: There are two compressors, namely the first compressor and the second compressor. The gas engine drives the two compressors to work simultaneously through a belt. The first compressor output end pipeline is connected to the first high-temperature temperature sensor Tp1, the second compressor output end pipeline is connected to the second high-temperature temperature sensor Tp2, the first compressor and the second compressor input end pipelines are connected to the low-temperature temperature sensor Th, the high-pressure pressure sensor PH is connected to the pipeline between the oil separator and the four-way valve, and the low-pressure pressure sensor PL is connected to the pipeline between the gas-liquid separator and the compressor.

3. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: The output end of the outdoor fin heat exchanger is divided into two paths, the first path is connected to the first heat exchanger through the electronic expansion valve EXV1A, and the second path is connected to the first heat exchanger through the electronic expansion valve EXV1B.

4. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: An air-conditioning water outlet temperature sensor Two is connected to the air-conditioning water outlet end of the first heat exchanger, and an air-conditioning water inlet temperature sensor Twi is connected to the air-conditioning water inlet end of the first heat exchanger.

5. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: A temperature sensor Th2 is connected to the pipeline between the four-way valve and the gas-liquid separator.

6. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: A manual drain pipe is connected to the pipeline formed by merging the chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger, and a manual ball valve HSV8 is provided on the manual drain pipe; an automatic drain pipe is connected to the pipeline formed by merging the chilled water output end of the second heat exchanger and the chilled water output end of the first heat exchanger, and a solenoid valve HSV7 is provided on the automatic drain pipe.

7. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: A solenoid valve HSV6 is connected between the domestic hot water inlet pipeline and the domestic hot water outlet pipeline.

8. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: The domestic hot water inlet pipeline is connected with a solenoid valve HSV3, the output end of the solenoid valve HSV3 is connected to a supplementary water flow switch, the output end of the supplementary water flow switch is connected to a one-way valve HCV2, and the output end of the one-way valve HCV2 is connected to the chilled water inlet pipeline.

9. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: The chilled water outlet pipeline is connected with a solenoid valve HSV4, the output end of the solenoid valve HSV4 is connected with a one-way valve HCV3, and the output end of the one-way valve HCV3 is connected with the domestic hot water outlet pipeline.

10. The high-efficiency heat pump for multiple supply of cooling, heating and domestic hot water according to claim 1 is characterized by: The radiator cover is connected with a water storage tank.

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