Water heater integrating use of air source and water source

Abstract

The utility model discloses a water heater integrating use of an air source and a water source, which is characterized in that an air source evaporator is added on the basis of the existing product structure of the existing waste heat gradient utilization water source heat pump water heater, and the air source evaporator is connected in parallel with an evaporator of a first group of water source heat pumps; the functions of sequential direct heating of the two water source heat pumps, complementary heating of the air source heat pump and the water source, independent heating of the air source heat pump, defrosting of the air source evaporator and the like are achieved through switching of the control valves. The problems of first hot water supply, insufficient waste heat, low hot water temperature, pipeline circulation, defrosting of an air source heat pump and the like in hot water supply are solved at low cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of energy-saving bathing hot water preparation, and particularly relates to a hot water machine integrating air source and water source. BACKGROUND

[0002] Public places, especially places with a large population, bathrooms and hot water supply systems are basic facilities that are in urgent need. In order to ensure the hot water supply of these places, a large amount of conventional energy is consumed every day. According to statistics, the annual bathing water consumption of colleges and public hospitals in China reaches 1 billion tons, and the total electric heating energy consumption can reach 41 billion kw.h. A waste heat three-stage cascade utilization water source heat pump hot water system disclosed in patent ZL2021207342255 has been transformed into a product named "waste heat cascade utilization water source heat pump hot water machine". The waste heat in the bathing wastewater is recovered through three stages to heat the tap water and the refrigerant of the two sets of water source heat pump systems. The main structure consists of a two-stage compression vapor refrigeration cycle device composed of a water-water heat exchanger and two sets of water source evaporators and two sets of heat pump condensers. The water-water heat exchanger directly exchanges heat between the waste hot water and the clean water, transferring the heat energy in the waste hot water to the clean water for the first stage of recycling. Then, the waste water with residual waste heat is used as the water source side heat source of the water source heat pump. The two evaporators successively absorb heat from the waste hot water to increase the temperature, and then heat the clean water through the condensation heat release of the refrigerant, thereby reducing the energy consumption of the compressor for heating water. The three-stage cascade recycling technology of waste water waste heat can achieve the preparation of one ton of bathing hot water from one ton of waste hot water when the tap water is 12℃, and the energy saving and carbon reduction effect reaches the domestic leading and international advanced level.

[0003] However, under abnormal conditions such as no waste hot water generated initially, environmental temperature too low, and tap water temperature lower than 12℃, using only bathing waste heat to heat water cannot achieve the preparation of one ton of bathing hot water from one ton of waste hot water, and even through the work of the compressor, the bathing water temperature at the set flow rate cannot be obtained. To make up for this deficiency, the general approach is to add an auxiliary heating system to the hot water storage tank to heat and store the tank in advance for standby use. The auxiliary heating system can be an electric heating rod, an air source heat pump, etc. The electric heating rod auxiliary heating system has too high operating cost and is prone to scaling, which reduces the heating efficiency and cannot guarantee long-term stable operation of the system. In addition, an air source heat pump device is added, which is an independent operating device from the existing waste heat cascade utilization water source heat pump hot water machine, occupies a large area, increases the equipment cost, and the actual use time of the air source heat pump is relatively short, which causes a waste of resources. UTILITY MODEL CONTENTS

[0004] To solve the above technical problems, the utility model discloses on the basis of the product structure of the existing waste heat step utilization water source heat pump water heater, increase an air source evaporator, the air source evaporator is connected in parallel with the evaporator of first group water source heat pump, and is connected to the condenser of first group water source heat pump through pipe valve, realizes two group water source heat pump in succession direct heating, air source heat pump and water source complementary heating, air source heat pump alone heating, air source evaporator defrosting etc.

[0005] The technical scheme provided by the utility model is as follows:

[0006] A water heater integrating air source and water source use, comprising a water-water heat exchanger, a water source heat pump I and a water source heat pump II, an inlet end of a waste water passage of the water-water heat exchanger is connected to a waste water source, an outlet of the waste water passage of the water-water heat exchanger is connected to an evaporator II in the water source heat pump II, the evaporator II is connected to an evaporator I of the water source heat pump I; a clean water passage of the water-water heat exchanger is connected to tap water at an inlet, an outlet of the clean water passage is connected to a condenser I in the water source heat pump I, the condenser I is connected to a condenser II in the water source heat pump II, the condenser II, the evaporator II and a gas-liquid separator II, a compressor II and an electronic expansion valve II arranged therebetween form a refrigerant circulation loop system II, the condenser I, the evaporator I and a gas-liquid separator I, a compressor I and an electronic expansion valve I arranged therebetween form a refrigerant circulation loop system I; further comprising an air source evaporator connected in parallel to the evaporator I in the refrigerant circulation loop system I, and three-way valves I, II and a four-way valve are further arranged on the refrigerant circulation loop system I, a refrigerant outlet end of the condenser I is connected to the electronic expansion valve I, three interfaces of the three-way valve I are respectively connected to the electronic expansion valve I, a refrigerant inlet end of the air source evaporator and a refrigerant inlet end of the evaporator I, three interfaces of the three-way valve II are respectively connected to a refrigerant outlet end of the evaporator I, the gas-liquid separator I and the four-way valve, the gas-liquid separator I, the compressor I and the four-way valve are connected in sequence, and the other two interfaces of the four-way valve are respectively connected to a refrigerant outlet end of the air source evaporator and an inlet end of the condenser I.

[0007] Preferably, the compressor I is an air injection enthalpy increasing compressor.

[0008] Preferably, further comprising a heat exchanger and an electronic expansion valve III, three interfaces of the heat exchanger are respectively connected to the electronic expansion valve III, the compressor I and a refrigerant outlet end of the condenser I, and a pipeline after the electronic expansion valve I and the electronic expansion valve III are connected in parallel is connected to a fourth interface of the heat exchanger.

[0009] Preferably, the heat exchanger is a plate heat exchanger or a high-efficiency tank heat exchanger.

[0010] Preferably, it includes a first hot water preparation mode, a second hot water preparation mode, and a third hot water preparation mode;

[0011] The first hot water preparation mode is direct heating. The air source evaporator is not activated. Only the heat source in the waste hot water is used. After the waste water flows out of the waste water tank, it enters the waste hot water channel of the water-to-water heat exchanger. After flowing out, it enters evaporator II and evaporator I in sequence to release heat and then is directly discharged into the public sewage network. Clean water enters the clean water channel of the water-to-water heat exchanger from the tap water supply pipe. After flowing out, it enters condenser I and condenser II in sequence to absorb heat and then directly enters the hot water tank.

[0012] The second hot water preparation mode is a direct heating type. The air source evaporator is activated, but evaporator I is not. It utilizes both air energy and the heat energy from wastewater. Wastewater flows from the wastewater tank into the wastewater channel of the water-to-water heat exchanger, then flows into evaporator II to release heat before being directly discharged into the public sewage network. Clean water enters the clean water channel of the water-to-water heat exchanger from the tap water supply pipe, then flows into condenser I and condenser II to absorb heat before directly entering the hot water tank. In this hot water preparation mode, the refrigerant absorbs heat in the air source evaporator and then releases heat in condenser I, transferring the heat to the clean water.

[0013] The third hot water preparation mode is a circulating heating type, which uses only air energy. When the air source evaporator is started, clean water flows out of the hot water tank and enters condenser I. After absorbing heat, it enters the hot water tank again and then enters condenser I to absorb heat again. This cycle of heat absorption continues until the set temperature is reached. In this hot water preparation mode, after the refrigerant absorbs heat in the air source evaporator, it enters condenser I to release heat and transfers the heat to the clean water.

[0014] Compared with the prior art, the present invention has the following technical advantages:

[0015] (1) Compared with existing waste heat cascade utilization water source heat pump water heaters, this utility model only requires the installation of one air source evaporator outdoors. The design is compact and reasonable, the overall indoor equipment footprint remains unchanged, and there is no need to add a refrigerant circulation loop system. The air source evaporator is directly connected in parallel with the evaporator of the first group of water source heat pumps, and connected to the condenser of the first group of water source heat pumps through a pipe valve. By controlling the valve to switch, the functions of sequential direct heating of the two groups of water source heat pumps, complementary heating of air source heat pump and water source, independent heating of air source heat pump, and defrosting of air source evaporator are realized. This solves the problems in hot water supply such as initial hot water supply, insufficient waste heat, low hot water temperature, pipe circulation, and defrosting of air source heat pump at a lower cost. Compared with directly using air source heat pump for auxiliary heating, the cost of the equipment configuration is reduced by 50%.

[0016] (2) In the first heat pump system, this utility model replaces the ordinary compressor with a jet enthalpy-increasing compressor and adds a plate heat exchanger or a high-efficiency tank heat exchanger. The heat exchanger subcools the refrigerant in the main circulation loop before throttling, increasing the enthalpy difference. On the other hand, it preheats the low-pressure, low-temperature refrigerant in the auxiliary loop (which will be directly compressed by the compressor) after being depressurized by the electronic expansion valve to achieve a suitable medium pressure, which is then supplied to the compressor for secondary compression. This improves the performance of the air source heat pump in cold climate conditions and enhances its heating capacity in low-temperature environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a waste heat cascade utilization water source heat pump water heater in the background technology.

[0018] Figure 2 This is a schematic diagram of the structure of the present invention.

[0019] Figure 3 This is a flowchart illustrating the operation of the first hot water preparation mode in this invention.

[0020] Figure 4 This is a flowchart illustrating the operation of the second hot water preparation mode in this invention.

[0021] Figure 5 This is a flowchart illustrating the operation of the third hot water preparation mode in this invention.

[0022] Figure 6 This is a flowchart illustrating the operation of the second defrosting mode in this invention.

[0023] Figure 7 This is a flowchart illustrating the operation of the second defrosting mode in this invention.

[0024] The components are as follows: 1. Water-to-water heat exchanger; 2. Condenser I; 3. Condenser II; 4. Hot water tank; 5. Evaporator II; 6. Evaporator I; 7. Air source evaporator; 8. Wastewater tank; 9. Wastewater pump I; 10. Wastewater pump II; 11. Three-way valve V; 12. Inlet valve; 13. Three-way valve III; 14. Three-way valve IV; 15. Electronic expansion valve II; 16. Gas-liquid separator II; 17. Compressor II; 18. Heat exchanger; 19. Electronic expansion valve I; 20. Three-way valve I; 21. Three-way valve II; 22. Gas-liquid separator I; 23. Compressor I; 24. Four-way valve; 25. Electronic expansion valve III. Detailed Implementation

[0025] The present invention will now be further described in conjunction with specific embodiments and accompanying drawings.

[0026] Figure 1This is a schematic diagram of the waste heat cascade utilization water source heat pump water heater of the present invention. From bottom to top, it consists of a water-to-water heat exchanger 1, a water source heat pump I, and a water source heat pump II. The heating path for clean water is as follows: after entering the heat exchanger, the clean water absorbs heat in one stage, then sequentially enters the condenser I 2 in water source heat pump I and the condenser II 3 in water source heat pump II for two and three stages of heat absorption, finally entering the hot water tank 4. The heat release path for waste hot water is as follows: the waste hot water releases heat in the water-to-water heat exchanger 1 in one stage, then sequentially enters the evaporator II 5 in water source heat pump II and the evaporator I 6 in water source heat pump I for two and three stages of heat release, before being discharged to the public sewage network or a greywater treatment plant. However, in summer, when the tap water temperature is high and the demand for hot water for bathing is not high, the bathing wastewater, after two stages of heat absorption, is discharged directly to the public sewage network or a greywater treatment plant without passing through the evaporator I 6 in water source heat pump I.

[0027] and Figure 1 The difference lies in that the components related to the flow of waste hot water and clean water, as well as the connection methods between these components, remain unchanged. Regarding the refrigerant circuit system, the water source heat pump II remains unchanged. Two three-way valves and one four-way valve are added to the refrigerant circuit system of the water source heat pump I to complete the parallel connection of the air source evaporator 7 and evaporator I 6 in the refrigerant circuit system. Figure 2 As shown, this utility model discloses a water heater integrating air source and water source utilization, mainly including a water-to-water heat exchanger 1, a water source heat pump I, and a water source heat pump II. A wastewater pump I 9 is installed at the inlet end of a wastewater tank 8, and a wastewater pump II 10 is installed on the pipeline between the wastewater tank 8 and the water-to-water heat exchanger 1. The wastewater tank 8 is connected to the inlet of the waste hot water channel of the water-to-water heat exchanger 1. The outlet of the waste hot water channel of the water-to-water heat exchanger 1 is connected to the inlet interface of the evaporator II 5 in the water source heat pump II. The outlet interface of the evaporator II 5 is connected to the A interface of a three-way valve V 11. The B interface of the three-way valve V 11 is connected to the inlet interface of the evaporator I 6 of the water source heat pump I. The three-way valve V... The C port of 11 and the outlet port of evaporator I6 are directly connected to the public sewage network or the greywater treatment point; the inlet of the clear water channel of water-to-water heat exchanger 1 is connected to the tap water supply pipe, and the tap water supply pipe is equipped with an inlet valve 12. The outlet of the clear water channel is connected to the B port of three-way valve III 13. The C port of three-way valve III 13 is connected to the hot water tank 4. The A port of three-way valve III 13 is connected to the inlet port of condenser I 2 in water source heat pump I. The outlet port of condenser I 2 is connected to the B port of three-way valve IV 14. The A port of three-way valve IV 14 is connected to the inlet port of condenser II 3 in water source heat pump II. The outlet port of condenser II 3 and the C port of three-way valve IV 14 are connected to the hot water tank 4. The pipeline formed by the above connection method is used for the flow heat absorption or heat exchange of wastewater and clear water in this utility model.

[0028] The connection method of the refrigerant circuit system in this utility model will now be described. In the water source heat pump II, the refrigerant channel outlet of condenser II 3, electronic expansion valve II 15, refrigerant channel of evaporator II 5, gas-liquid separator II 16, compressor II 17, and refrigerant channel inlet of condenser II 3 are connected in sequence to form a refrigerant circulation circuit system.

[0029] In the water source heat pump I, the refrigerant circuit system that uses waste heat from waste hot water to heat clean water is connected as follows: the refrigerant outlet of condenser I 2, heat exchanger 18, electronic expansion valve I 19, three-way valve I 20, refrigerant passage of evaporator I 6, three-way valve II 21, gas-liquid separator I 22, compressor I 23, four-way valve 24, and refrigerant inlet of condenser I 2 are connected in sequence to form a circuit.

[0030] In an air source heat pump, the refrigerant circuit system for heating clean water using an air source is connected as follows: the refrigerant outlet of condenser I2, heat exchanger 18, electronic expansion valve I 19, three-way valve I 20, refrigerant passage of air source evaporator 7, four-way valve 24 (in from port C, out from port D), three-way valve II 21, gas-liquid separator I 22, compressor I 23, four-way valve 24 (in from port A, out from port B), and the refrigerant inlet of condenser I2 are connected in sequence to form a circuit.

[0031] The first hot water preparation mode, the second hot water preparation mode, the third hot water preparation mode, the first defrosting mode, and the second defrosting mode of this utility model will now be described.

[0032] The first hot water preparation mode is activated when the waste heat from the bathing wastewater is sufficient to produce hot water at the set temperature and volume. In this mode, no air source is used; hot water is produced directly using only the waste heat from the bathing wastewater. Figure 3 As shown, the functional modes are water source heat pump I and water source heat pump II heating modes. Waste hot water route and direction: Waste hot water enters the water-to-water heat exchanger 1 for primary heat release, then sequentially enters the evaporator II 5 in water source heat pump II and the evaporator I 6 in water source heat pump I for secondary and tertiary heat release, before being discharged into the public sewage network or a greywater treatment point. Clean water route and direction: Clean water enters the water-to-water heat exchanger 1 for primary heat absorption, then sequentially enters the condenser I 2 in water source heat pump I and the condenser II 3 in water source heat pump II for secondary and tertiary heat absorption, finally entering the hot water tank 4.

[0033] The refrigerant flow path and direction of the water source heat pump I: The refrigerant flows out from the outlet B of the compressor I 23, and then sequentially through the four-way valve 24 (inlet A, outlet B), the refrigerant passage of the condenser I 2, the inlet A of the heat exchanger 18, the outlet B of the heat exchanger 18, the electronic expansion valve I 19, the three-way valve I 20 (inlet A, outlet B), the refrigerant passage of the evaporator I 6, the three-way valve II 21 (inlet B, outlet A), and the gas-liquid separator I 22, before entering the inlet A of the compressor I 23 to form a loop.

[0034] The compressor I 23 used in this invention is a jet enthalpy compressor, which requires an additional electronic expansion valve III 25. The electronic expansion valve III 25 is located between the heat exchanger 18 and the electronic expansion valve I 19, and is connected to the inlet of the electronic expansion valve I 19 and the heat exchanger inlet C of the heat exchanger 18, respectively. The outlet D of the heat exchanger 18 is connected to the air inlet C of the compressor I 23.

[0035] The refrigerant flow path and direction of the water source heat pump II: out of the outlet B of compressor II 17, through the refrigerant passage of condenser II 3, electronic expansion valve II 15, refrigerant passage of evaporator II 5, gas-liquid separator II 16, and into the inlet A of compressor II 17 to form a loop.

[0036] In this mode, the control valves for the clean water pipeline are as follows: inlet valve 12 is open, three-way valve III 13 interface AB is open, and the rest are closed; three-way valve IV 14 interface AB is open, and the rest are closed. The control valves for the waste hot water pipeline are as follows: waste water pump II 10 is started, three-way valve V 11 interface AB is open, and the rest are closed. The control valves for the refrigerant circuit of the water source heat pump I are as follows: three-way valve I 20 interface AB is open, and the rest are closed; three-way valve II 21 interface AB is open, and the rest are closed; four-way valve 24 interface AB is open, and the rest are closed.

[0037] The second hot water preparation mode is activated when the temperature of the collected wastewater is too low to meet the heat energy required to produce hot water at the set temperature and volume. Figure 4 As shown, the functional modes are air source heat pump and water source heat pump II heating modes. This mode can be activated when the waste heat from the waste water cannot produce a sufficient amount of hot water for bathing. Waste water route and direction: Waste water enters the water-to-water heat exchanger 1 for primary heat release, then sequentially enters the evaporator II 5 in the water source heat pump II for secondary heat release, and is then directly discharged to the public sewage network or a greywater treatment point. Clean water route and direction: Clean water enters the water-to-water heat exchanger 1 for primary heat absorption, then sequentially enters the condenser I 2 and condenser II 3 for secondary and tertiary heat absorption, and finally enters the hot water tank 4. In this mode, the refrigerant absorbs heat in the air source evaporator 7 and then flows into the condenser I 2 for heat release, thus heating the clean water.

[0038] The refrigerant flow path and direction of the water source heat pump II: out of the outlet B of compressor II 17, through the refrigerant passage of condenser II 3, electronic expansion valve II 15, refrigerant passage of evaporator II 5, gas-liquid separator II 16, and into the inlet A of compressor II 17 to form a loop.

[0039] The refrigerant flow path and direction of the air source heat pump: The refrigerant flows out from outlet B of compressor I 23, and then sequentially through four-way valve 24 (inlet A, outlet B), the refrigerant passage of condenser I 2, inlet A of heat exchanger 18, outlet B of heat exchanger 18, electronic expansion valve I 19, three-way valve I 20 (inlet A, outlet C), the refrigerant passage of air source evaporator 7, four-way valve 24 (inlet C, outlet D), three-way valve II 21 (inlet C, outlet A), and gas-liquid separator I 22, before entering inlet A of compressor I 23 to form a loop.

[0040] The compressor I 23 used in this invention is a jet enthalpy compressor, which requires an additional electronic expansion valve III 25. The electronic expansion valve III 25 is located between the heat exchanger 18 and the electronic expansion valve I 19, and is connected to the inlet of the electronic expansion valve I 19 and the heat exchanger inlet C of the heat exchanger 18, respectively. The outlet D of the heat exchanger 18 is connected to the air inlet C of the compressor I 23.

[0041] In this mode, the control valves for the clean water pipeline are as follows: inlet valve 12 is open, three-way valve III 13 interface AB is open, and the rest are closed; three-way valve IV 14 interface AB is open, and the rest are closed; the control valves for the waste hot water pipeline are as follows: waste water pump II 10 is started, three-way valve V 11 interface AC is open, and the rest are closed; the control valves for the refrigerant circuit of the water source heat pump I are as follows: three-way valve I 20 interface AC is open, and the rest are closed; three-way valve II 21 interface AC is open, and the rest are closed; four-way valve 24 interface AB is open, interface CD is open, and the rest are closed.

[0042] The third hot water preparation mode, such as Figure 5 As shown, the functional mode is the air source heat pump circulation heating mode, which does not use waste heat from waste hot water to heat clean water. This mode is mainly used when there is no waste hot water generated during initial use, and the clean water in hot water tank 4 needs to be heated to the set temperature using an air source heat pump to provide hot water for initial use. Alternatively, when the system is running and the water temperature in hot water tank 4 is lower than the set temperature, the clean water is circulated and heated to the set temperature by the air source heat pump. Clean water route and direction: The clean water in hot water tank 4 directly enters condenser I 2 to absorb heat, then directly enters hot water tank 1, and then enters condenser I 2 to absorb heat, circulating and absorbing heat until the set temperature is reached.

[0043] The refrigerant flow path and direction of the air source heat pump: The refrigerant flows out from outlet B of compressor I 23, and then sequentially through four-way valve 24 (inlet A, outlet B), the refrigerant passage of condenser I 2, inlet A of heat exchanger 18, outlet B of heat exchanger 18, electronic expansion valve I 19, three-way valve I 20 (inlet A, outlet C), the refrigerant passage of air source evaporator 7, four-way valve 24 (inlet C, outlet D), three-way valve II 21 (inlet C, outlet A), and gas-liquid separator I 22, before entering inlet A of compressor I 23 to form a loop.

[0044] The compressor I 23 used in this invention is a jet enthalpy compressor, which requires an additional electronic expansion valve III 25. The electronic expansion valve III 25 is located between the heat exchanger 18 and the electronic expansion valve I 19, and is connected to the inlet of the electronic expansion valve I 19 and the heat exchanger inlet C of the heat exchanger 18, respectively. The outlet D of the heat exchanger 18 is connected to the air inlet C of the compressor I 23.

[0045] In this mode, the control valves for the clean water pipeline are as follows: inlet valve 12 is closed, three-way valve III 13 port AC is open, and the rest are closed; three-way valve IV 14 port CB is open, and the rest are closed; the control valves for the waste hot water pipeline are as follows: waste water pump II 10 is closed, and three-way valve V 11 is closed; the control valves for the refrigerant circuit of the air source heat pump are as follows: three-way valve I 20 port AC is open, and the rest are closed; three-way valve II 21 port AC is open, and the rest are closed; four-way valve 24 port AB is open, port CD is open, and the rest are closed.

[0046] In the first defrosting mode, the air source evaporator 7 is activated, but evaporator I 6 is not. The function is to defrost the air source evaporator 7 and heat the water source heat pump II. Wastewater route and direction: Waste hot water enters the water-to-water heat exchanger 1 for primary heat release, then enters the evaporator II 5 in the water source heat pump II for secondary heat release, before being directly discharged to the public sewage network or a greywater treatment point. Clean water route and direction (circulation): Clean water enters and sequentially enters the condenser I 2 for heat release, then absorbs heat in the condenser II 3, and then enters the hot water tank 4, repeating this process until the air source evaporator 7 defrosts. In this mode, the air source evaporator 7 operates in reverse, functioning as a condenser. Correspondingly, the refrigerant in the condenser I 2 flows in reverse, functioning as an evaporator. That is, the refrigerant absorbs heat in the condenser I 2 and releases heat in the air source evaporator 7, gradually defrosting the air source evaporator 7.

[0047] The refrigerant flow path and direction of the air source heat pump: The refrigerant flows out from the outlet B of compressor I 7, and then sequentially through four-way valve 24 (inlet A, outlet C), the refrigerant passage of air source evaporator 7, three-way valve I 20 (outlet A, outlet C), electronic expansion valve I 19, outlet B of heat exchanger 18, inlet A of heat exchanger 18, the refrigerant passage of condenser I 2, four-way valve 24 (inlet B, outlet D), three-way valve II 21 (inlet C, outlet A), gas-liquid separator I 22, and finally enters the inlet A of compressor I 23 to form a loop.

[0048] The compressor I 23 used in this invention is a jet enthalpy compressor, which requires an additional electronic expansion valve III 25. The electronic expansion valve III 25 is located between the heat exchanger 18 and the electronic expansion valve I 19, and is connected to the inlet of the electronic expansion valve I 19 and the heat exchanger inlet C of the heat exchanger 18, respectively. The outlet D of the heat exchanger 18 is connected to the air inlet C of the compressor I 23.

[0049] In this mode, the control valves for the clean water pipeline are as follows: inlet valve 12 is closed, three-way valve III 13 port AC is open, and the rest are closed; three-way valve IV 14 port AB is open, and the rest are closed. The control valves for the waste hot water pipeline are as follows: waste water pump II 10 is started, three-way valve V 11 port AC is open, and the rest are closed. The control valves for the refrigerant circuit of the air source heat pump are as follows: three-way valve I 20 port AC is open, and the rest are closed; three-way valve II 21 port AC is open, and the rest are closed; four-way valve 24 port AC is open, port BD is open, and the rest are closed.

[0050] The second defrosting mode uses the air source evaporator 7, but does not activate evaporators II 5 or I 6. It does not use waste heat from the wastewater to heat the clean water, and functions as an air source circulating defrosting mode. Clean water circulates from the hot water tank 4, sequentially entering condenser I 2 to release heat before returning to the hot water tank 4, until the air source evaporator 7 defrosts. In this mode, the air source evaporator 7 operates in reverse, functioning as a condenser. Correspondingly, the refrigerant in condenser I 2 flows in reverse, functioning as an evaporator. That is, the refrigerant absorbs heat in condenser I 2 and releases heat in the air source evaporator 7, gradually defrosting the air source evaporator 7.

[0051] The refrigerant flow path and direction of the air source heat pump: The refrigerant flows out from the outlet B of compressor I 7, and then sequentially through four-way valve 24 (inlet A, outlet C), the refrigerant passage of air source evaporator 7, three-way valve I 20 (outlet A, outlet C), electronic expansion valve I 19, outlet B of heat exchanger 18, inlet A of heat exchanger 18, the refrigerant passage of condenser I 2, four-way valve 24 (inlet B, outlet D), three-way valve II 21 (inlet C, outlet A), gas-liquid separator I 22, and finally enters the inlet A of compressor I 23 to form a loop.

[0052] The compressor I 23 used in this invention is a jet enthalpy compressor, which requires an additional electronic expansion valve III 25. The electronic expansion valve III 25 is located between the heat exchanger 18 and the electronic expansion valve I 19, and is connected to the inlet of the electronic expansion valve I 19 and the heat exchanger inlet C of the heat exchanger 18, respectively. The outlet D of the heat exchanger 18 is connected to the air inlet C of the compressor I 23.

[0053] In this mode, the control valves for the clean water pipeline are as follows: inlet valve 12 is closed, three-way valve III 13 port AC is open, and the rest are closed; three-way valve IV 14 port CB is open, and the rest are closed; the control valves for the waste hot water pipeline are as follows: waste water pump II 10 is closed, and three-way valve V 11 is closed; the control valves for the refrigerant circuit of the air source heat pump are as follows: three-way valve I 20 port AC is open, and the rest are closed; three-way valve II 21 port AC is open, and the rest are closed; four-way valve 24 port AC is open, port BD is open, and the rest are closed.

Claims

1. A water heater integrating air source and water source usage, comprising a water-to-water heat exchanger, a water source heat pump I, and a water source heat pump II; the inlet end of the waste hot water channel of the water-to-water heat exchanger is connected to a wastewater source, and the outlet of the waste hot water channel of the water-to-water heat exchanger is connected to the evaporator II in the water source heat pump II; the evaporator II is connected to the evaporator I of the water source heat pump I; the inlet of the clear water channel of the water-to-water heat exchanger is connected to tap water, and the outlet of the clear water channel is connected to the condenser I in the water source heat pump I; the condenser I is connected to the condenser II of the water source heat pump II; the condenser II, the evaporator II, and the gas-liquid separator II, compressor II, and electronic expansion valve II disposed between them form a refrigerant circulation loop system II; the condenser I, the evaporator I, and the gas-liquid separator I, compressor I, and electronic expansion valve I disposed between them form a refrigerant circulation loop system I; characterized in that: It also includes an air-source evaporator, which is connected in parallel with evaporator I in refrigerant circulation loop system I. Three-way valve I, three-way valve II, and four-way valve are also installed in refrigerant circulation loop system I. The refrigerant outlet of condenser I is connected to electronic expansion valve I. The three ports of three-way valve I are connected to electronic expansion valve I, the refrigerant inlet of the air-source evaporator, and the refrigerant inlet of evaporator I, respectively. The three ports of three-way valve II are connected to the refrigerant outlet of evaporator I, gas-liquid separator I, and four-way valve, respectively. Gas-liquid separator I, compressor I, and four-way valve are connected in sequence. The other two ports of the four-way valve are connected to the refrigerant outlet of the air-source evaporator and the inlet of condenser I, respectively.

2. A water heater integrating air source and water source functions as described in claim 1, characterized in that: Compressor I is a jet enthalpy-increasing compressor.

3. A water heater integrating air source and water source functions as described in claim 2, characterized in that: It also includes a heat exchanger and an electronic expansion valve III. Three of the heat exchanger's ports are connected to the refrigerant outlets of the electronic expansion valve III, compressor I, and condenser I, respectively. The pipeline formed by the parallel connection of electronic expansion valve I and electronic expansion valve III is connected to the fourth port of the heat exchanger.

4. A water heater integrating air source and water source functions as described in claim 3, characterized in that: The heat exchanger is a plate heat exchanger or a high-efficiency tank heat exchanger.

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