A multi-energy complementary centralized domestic hot water supply system

Abstract

The present invention relates to the technical field of water supply systems, and discloses a multi-energy complementary centralized domestic hot water supply system, which solves the problem that the existing domestic hot water is supplied by solar water heaters or heat pump water heaters alone, and when there is insufficient sunlight and insufficient environmental heat source, the temperature of the domestic hot water will be insufficient, affecting the daily water use of residents. A multi-energy complementary centralized domestic hot water supply system includes a control terminal, a water supply pump, a gas-assisted heating mechanism, a solar water heater and a heat pump water heater, and the water inlet end of the water supply pump is connected to the municipal water supply network pipe. The present invention optimizes and controls the solar water heater, the heat pump water heater and the gas-assisted heating mechanism, preferentially utilizes solar energy and environmental heat sources for water heating, and uses gas as a supplementary energy source to achieve energy-saving, environmentally friendly, healthy and sustainable hot water supply.

Description

Technical Field

[0001] The invention relates to the technical field of water supply systems, and in particular to a multi-energy complementary centralized domestic hot water supply system. Background Art

[0002] With the development of social economy and the improvement of people's living standards, residents' demand for domestic hot water is growing. At present, the domestic hot water supply system on the market mainly relies on a single energy source, such as solar water heaters, heat pump water heaters, electric water heaters or gas water heaters. Although these devices meet the residents' domestic hot water needs to a certain extent, they have the following shortcomings: 1. The existing domestic hot water is supplied by solar water heaters or heat pump water heaters alone. When the sunlight is insufficient and the environmental heat source is insufficient, the temperature of the domestic hot water will be insufficient, affecting the daily water use of residents; 2. Although electric water heaters and gas water heaters have fast heating speed and high hot water temperature, the operating cost is high, and gas water heaters are limited by gas supply; 3. The single energy hot water supply system is difficult to ensure a stable supply of domestic hot water when the energy supply is unstable; 4. The existing hot water supply system lacks complementarity and optimization between energy sources, resulting in low energy utilization, which is not conducive to energy conservation and emission reduction. In response to the above problems, a multi-energy complementary centralized domestic hot water supply system was developed. Summary of the invention

[0003] The object of the present invention is to provide a multi-energy complementary centralized domestic hot water supply system to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-energy complementary centralized domestic hot water supply system, comprising a control terminal, a water supply pump, a gas-assisted heating mechanism, a solar water heater and a heat pump water heater, the water inlet end of the water supply pump is connected to the municipal water supply network pipe, the water outlet end of the water supply pump is connected to the water inlet of the main water pipe, the water outlet of the main water pipe is connected to a water supply four-way solenoid valve, the water supply four-way solenoid valve has a water inlet end and three water outlet ends, the three water outlet ends of the water supply four-way solenoid valve are respectively connected to a first shunt pipe, a second shunt pipe and a third shunt pipe, The first shunt pipe is connected to the water inlet end of the heat pump water heater, the second shunt pipe is connected to the water inlet end of the solar water heater, the third shunt pipe is connected to the gas-assisted heating mechanism, the water outlet end of the solar water heater is connected to the second water outlet pipe, the water outlet end of the heat pump water heater is connected to the first water outlet pipe, the other ends of the first water outlet pipe and the second water outlet pipe are commonly connected to a hot water outlet tank, the other end of the hot water outlet tank is installed with the first hot water outlet pipe and the second hot water outlet pipe, and a guide pipe and a return pipe are installed between the hot water outlet tank and the gas-assisted heating mechanism.

[0005] Preferably, a water outlet four-way solenoid valve, a one-way solenoid valve 1 and a one-way solenoid valve 2 are installed inside the hot water outlet tank, and the water outlet four-way solenoid valve has two water inlet ends and two water outlet ends.

[0006] Preferably, the first water outlet pipe and the second water outlet pipe are respectively connected to the two water inlet ends of the water outlet four-way solenoid valve, and a temperature sensor 1 and a flow sensor 1 are installed on the first water outlet pipe and close to the water outlet four-way solenoid valve, and a temperature sensor 2 and a flow sensor 2 are installed on the second water outlet pipe and close to the water outlet four-way solenoid valve. The water supply pump, temperature sensor 1, temperature sensor 2, flow sensor 1 and flow sensor 2 are all electrically connected to the control terminal.

[0007] Preferably, one water outlet end of the water outlet four-way solenoid valve is connected to one end of the second hot water outlet pipe, and the other water outlet end of the water outlet four-way solenoid valve is connected to an intermediate water pipe.

[0008] Preferably, the other end of the intermediate water pipe is connected to the water inlet end of the one-way solenoid valve, and the water outlet end of the one-way solenoid valve is connected to one end of the guide pipe.

[0009] Preferably, the water inlet end of the second one-way solenoid valve is connected to the return pipe, and the water outlet end of the second one-way solenoid valve is connected to one end of the first hot water outlet pipe.

[0010] Preferably, a gas ignition mechanism is fixedly installed inside the gas-assisted heating mechanism, a gas heating box is installed on the top of the gas ignition mechanism, a heat-conducting sleeve is inlaid on the outer surface of the gas heating box, a gas delivery pipe is fixed to the bottom end of the gas ignition mechanism, and one end of the gas delivery pipe passes through the gas-assisted heating mechanism and is connected to the gas pipe.

[0011] Preferably, a drainage one-way valve is installed under the heat-conducting sleeve plate, and the drainage one-way valve is fixed on the outer wall of the gas heating box. The drainage one-way valve has two water inlet ends and one water outlet end, and the guide pipe and the third diversion pipe are respectively connected to the two water inlet ends of the drainage one-way valve.

[0012] Preferably, the water outlet end of the drainage one-way valve is connected to a preheating water pipe, and the preheating water pipe is spirally wound around the outside of the heat-conducting sleeve. A heating water pipe is installed in the gas heating box, and the top end of the preheating water pipe passes through the gas heating box and is connected to the top end of the heating water pipe, and the bottom end of the heating water pipe passes through the gas heating box and is connected to a return pipe.

[0013] Preferably, a spiral groove is provided on the outer surface of the heat-conducting sleeve, and the heat-conducting sleeve is clamped in the spiral groove. The cross-section of the spiral groove is C-shaped, and the inner diameter of the spiral groove matches the outer diameter of the preheating water pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. When the temperature of hot water generated inside any one of the solar water heater and the heat pump water heater reaches the water outlet requirements, the water outlet temperatures of the solar water heater and the heat pump water heater are compared. When the water outlet temperature of the solar water heater is high, the domestic hot water is supplied through the solar water heater; when the water outlet temperature of the heat pump water heater is high, the domestic hot water is supplied through the heat pump water heater; when the water outlet temperatures of the solar water heater and the heat pump water heater are the same and both meet the water outlet requirements, the water outlet flow of the solar water heater and the heat pump water heater is compared. The solar water heater or the heat pump water heater with the larger water outlet flow will supply domestic hot water. When the outlet water temperature of the solar water heater and the heat pump water heater is insufficient, the warm water in the solar water heater and the heat pump water heater is guided to the inside of the gas-assisted heating mechanism through the first outlet pipe, the second outlet pipe, the outlet four-way solenoid valve, the intermediate water pipe, the one-way solenoid valve and the guide pipe, and the warm water is heated by gas to obtain hot water, and then the hot water enters the first hot water outlet pipe through the return pipe and the one-way solenoid valve 2 to supply domestic hot water. The present invention optimizes and controls the solar water heater, the heat pump water heater and the gas-assisted heating mechanism, preferentially utilizes solar energy and environmental heat sources for water heating, and uses gas as a supplementary energy source to achieve energy-saving, environmentally friendly, healthy and sustainable hot water supply.

[0015] 2. When the present invention utilizes gas to heat the water in the heating water pipe, the excess heat in the gas heating box will be transferred to the heat-conducting sleeve, and the water flowing in the preheating water pipe can be preheated through the heat-conducting sleeve, thereby making full use of the heat generated by the gas combustion to achieve energy-saving and environmental protection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the hot water outlet tank of the present invention; Figure 3 This is the water outlet logic block diagram when the water outlet flow of the solar water heater and the heat pump water heater is the same; Figure 4 This is the water outlet logic block diagram when the outlet water temperature of the solar water heater and the heat pump water heater is the same; Figure 5 This is the water outlet logic block diagram when the outlet water temperature and outlet water flow of the solar water heater and the heat pump water heater are the same; Figure 6 It is a structural schematic diagram of the gas-assisted heating mechanism of the present invention; Figure 7 It is a schematic diagram of the structure of the heating water pipe of the present invention.

[0017] In the figure: 1. control terminal; 2. water supply pump; 3. main water pipe; 4. gas auxiliary heating mechanism; 5. solar water heater; 6. heat pump water heater; 7. water supply four-way solenoid valve; 8. first shunt pipe; 9. second shunt pipe; 10. third shunt pipe; 11. first water outlet pipe; 12. second water outlet pipe; 13. hot water outlet tank; 14. guide pipe; 15. return pipe; 16. first hot water outlet pipe; 17. second hot water outlet pipe; 18. temperature sensor; 19. water outlet four-way solenoid valve; 20. one-way solenoid valve 1; 21. flow sensor; 22. gas ignition mechanism; 23. diversion one-way valve; 24. preheating water pipe; 25. gas heating box; 26. heat transfer sleeve; 27. heating water pipe; 28. intermediate water pipe; 29. ​​gas delivery pipe; 30. two-way solenoid valve; 31. two temperature sensors; 32. two flow sensors. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figures 1 to 5 As shown, a multi-energy complementary centralized domestic hot water supply system includes a control terminal 1, a water supply pump 2, a gas-assisted heating mechanism 4, a solar water heater 5 and a heat pump water heater 6. The water inlet end of the water supply pump 2 is connected to the municipal water supply network pipe, and the water outlet end of the water supply pump 2 is connected to the water inlet of the main water pipe 3. The water outlet of the main water pipe 3 is connected to a water supply four-way solenoid valve 7. The water supply four-way solenoid valve 7 has a water inlet end and three water outlet ends. The three water outlet ends of the water supply four-way solenoid valve 7 are respectively connected to a first shunt pipe 8, a second shunt pipe 9 and a third shunt pipe 10. The first shunt pipe 8 is connected to the heat pump water heater 6. The heat pump water heater 6 is connected to the water inlet end of the solar water heater 6, the second shunt pipe 9 is connected to the water inlet end of the solar water heater 5, the third shunt pipe 10 is connected to the gas-assisted heating mechanism 4, the water outlet end of the solar water heater 5 is connected to the second water outlet pipe 12, the water outlet end of the heat pump water heater 6 is connected to the first water outlet pipe 11, the other ends of the first water outlet pipe 11 and the second water outlet pipe 12 are commonly connected to a hot water outlet tank 13, the other end of the hot water outlet tank 13 is installed with a first hot water outlet pipe 16 and a second hot water outlet pipe 17, and a guide pipe 14 and a return pipe 15 are installed between the hot water outlet tank 13 and the gas-assisted heating mechanism 4.

[0020] A water outlet four-way solenoid valve 19, a one-way solenoid valve 1 20 and a one-way solenoid valve 2 30 are installed inside the hot water outlet tank 13. The water outlet four-way solenoid valve 19 has two water inlet ends and two water outlet ends. The first water outlet pipe 11 and the second water outlet pipe 12 are respectively connected to the two water inlet ends of the water outlet four-way solenoid valve 19. A temperature sensor 1 18 and a flow sensor 1 21 are installed on the first water outlet pipe 11 and near the water outlet four-way solenoid valve 19. A temperature sensor 2 31 and a flow sensor 2 32 are installed on the second water outlet pipe 12 and near the water outlet four-way solenoid valve 19. The water supply pump 2, the temperature sensor 1 18, the temperature sensor 2 31, the flow sensor 1 21 and the flow sensor 2 32 are all electrically connected to the control terminal 1.

[0021] One water outlet end of the water outlet four-way solenoid valve 19 is connected to one end of the second hot water outlet pipe 17, and the other water outlet end of the water outlet four-way solenoid valve 19 is connected to the intermediate water pipe 28. The other end of the intermediate water pipe 28 is connected to the water inlet end of the one-way solenoid valve 20, and the water outlet end of the one-way solenoid valve 20 is connected to one end of the guide pipe 14.

[0022] like Figure 1 , Figure 6 and Figure 7 As shown, a gas ignition mechanism 22 is fixedly installed inside the gas-assisted heating mechanism 4, a gas heating box 25 is installed on the top of the gas ignition mechanism 22, a heat-conducting sleeve 26 is inlaid on the outer surface of the gas heating box 25, a gas delivery pipe 29 is fixed at the bottom end of the gas ignition mechanism 22, and one end of the gas delivery pipe 29 passes through the gas-assisted heating mechanism 4 and is connected to the gas pipe. A drainage check valve 23 is installed below the heat-conducting sleeve 26, and the drainage check valve 23 is fixed on the outer side wall of the gas heating box 25. The drainage check valve 23 has two water inlet ends and one water outlet end, and the guide pipe 14 and the third diverter pipe 10 are respectively connected to the two water inlet ends of the drainage check valve 23.

[0023] The outlet of the drainage check valve 23 is connected to a preheating water pipe 24, which is spirally wound around the outside of the heat-conducting sleeve 26. A heating water pipe 27 is installed in the gas heating box 25. The top of the preheating water pipe 24 passes through the gas heating box 25 and is connected to the top of the heating water pipe 27. The bottom of the heating water pipe 27 passes through the gas heating box 25 and is connected to the return pipe 15. A spiral groove is provided on the outer surface of the heat-conducting sleeve 26, and the heat-conducting sleeve 26 is clamped in the spiral groove. The cross-section of the spiral groove is C-shaped, and the inner diameter of the spiral groove matches the outer diameter of the preheating water pipe 24. When the water flowing in the heating water pipe 27 is heated by gas, the excess heat in the gas heating box 25 will be transferred to the heat-conducting sleeve 26, and the water flowing inside the preheating water pipe 24 can be preheated by the heat-conducting sleeve 26, thereby making full use of the heat generated by the combustion of gas to achieve energy-saving and environmental protection effects.

[0024] Working principle: When in use, all devices are powered on. After the power is turned on, the water supply pump 2 delivers water to the solar water heater 5 and the heat pump water heater 6 through the main water pipe 3 and the water supply four-way solenoid valve 7. After the water inside the solar water heater 5 and the heat pump water heater 6 is sufficient, the solar water heater 5 uses solar energy to heat the internal water, and the heat pump water heater 6 heats the internal water through the heat energy in the surrounding environment. When residents use hot water, the solar water heater 5 delivers hot water through the second water outlet pipe 12, and the heat pump water heater 6 delivers hot water through the first water outlet pipe 11. The temperature and flow of the hot water in the first water outlet pipe 11 are detected by the temperature sensor 18 and the flow sensor 1 21; the temperature and flow of the hot water in the second water outlet pipe 12 are detected by the temperature sensor 2 31 and the flow sensor 2 32. The temperature sensor 18, the flow sensor 1 21, the temperature sensor 2 31 and the flow sensor 2 32 respectively feed back the detected data to the control terminal 1, and the control terminal 1 analyzes and compares the received data.

[0025] When the temperature and flow rate of the hot water delivered by the solar water heater 5 and the heat pump water heater 6 meet the water outlet requirements, compare the water outlet temperatures of the solar water heater 5 and the heat pump water heater 6. If the water outlet temperature of the solar water heater 5 is high, close the water inlet end of the water outlet four-way solenoid valve 19 connected to the first water outlet pipe 11, and at the same time close the water outlet end of the water outlet four-way solenoid valve 19 connected to the intermediate water pipe 28, and send the hot water in the second water outlet pipe 12 into the second hot water outlet pipe 17 from the water outlet end connected to the second hot water outlet pipe 17, so as to supply domestic hot water through the solar water heater 5. If the outlet water temperature of the heat pump water heater 6 is high, the water inlet end of the water outlet four-way solenoid valve 19 connected to the second water outlet pipe 12 is closed, and at the same time, the water outlet end of the water outlet four-way solenoid valve 19 connected to the intermediate water pipe 28 is closed, and the hot water in the first water outlet pipe 11 is sent into the second hot water outlet pipe 17 from the water outlet end of the water outlet four-way solenoid valve 19 connected to the second hot water outlet pipe 17, and the heat pump water heater 6 supplies domestic hot water.

[0026] If the outlet water temperatures of the solar water heater 5 and the heat pump water heater 6 are the same, the outlet water flow rates of the solar water heater 5 and the heat pump water heater 6 are compared. If the outlet water flow rate of the solar water heater 5 is high, the water inlet end connected to the first water outlet pipe 11 by the outlet four-way solenoid valve 19 is closed, and at the same time, the water outlet end connected to the intermediate water pipe 28 by the outlet four-way solenoid valve 19 is closed, and the hot water in the second water outlet pipe 12 is sent into the second hot water outlet pipe 17 from the outlet end connected to the second hot water outlet pipe 17 by the outlet four-way solenoid valve 19, and the domestic hot water is supplied by the solar water heater 5. If the water flow rate of the heat pump water heater 6 is high, the water inlet end of the water outlet four-way solenoid valve 19 connected to the second water outlet pipe 12 is closed, and the water outlet end of the water outlet four-way solenoid valve 19 connected to the intermediate water pipe 28 is closed at the same time, and the hot water in the first water outlet pipe 11 is sent into the second hot water outlet pipe 17 from the water outlet end of the water outlet four-way solenoid valve 19 connected to the second hot water outlet pipe 17, and the heat pump water heater 6 supplies domestic hot water.

[0027] When the water flow rates of the solar water heater 5 and the heat pump water heater 6 are both lower than the specified water flow rate requirements, but both exceed half of the water flow rate requirements, close the water outlet end of the water outlet four-way solenoid valve 19 connected to the intermediate water pipe 28, and open the two water inlet ends of the water outlet four-way solenoid valve 19 at the same time, and guide the water in the first water outlet pipe 11 and the second water outlet pipe 12 to the second hot water outlet pipe 17, so that the solar water heater 5 and the heat pump water heater 6 jointly supply domestic hot water.

[0028] When the outlet water temperatures of the solar water heater 5 and the heat pump water heater 6 do not meet the specified outlet water temperature requirements, the outlet water temperatures of the solar water heater 5 and the heat pump water heater 6 are compared. If the outlet water temperature of the solar water heater 5 is higher, the water inlet end of the outlet water four-way solenoid valve 19 connected to the first outlet water pipe 11 is closed, and the water inlet end of the second hot water outlet pipe 17 is closed, and the water in the second outlet water pipe 12 is guided to the guide pipe 14 through the outlet water four-way solenoid valve 19, the intermediate water pipe 28 and the one-way solenoid valve 20. If the outlet water temperature of the heat pump water heater 6 is high, the water inlet end of the water outlet four-way solenoid valve 19 connected to the second water outlet pipe 12 is closed, and the water inlet end of the second hot water outlet pipe 17 is closed, and the water in the first water outlet pipe 11 is guided to the guide pipe 14 through the water outlet four-way solenoid valve 19, the intermediate water pipe 28 and the one-way solenoid valve 1 20. The water enters the drainage one-way valve 23 through the guide pipe 14, and then flows through the drainage one-way valve 23 and the preheating water pipe 24 in sequence, and finally enters the heating water pipe 27. At this time, the gas enters the gas ignition mechanism 22 through the gas delivery pipe 29. The gas ignition mechanism 22 uses the gas to heat the water flowing inside the heating water pipe 27. When the water inside the heating water pipe 27 is heated to meet the outlet water temperature requirement, the water inside the heating water pipe 27 enters the first hot water outlet pipe 16 along the reflux pipe 15 and the one-way solenoid valve 2 30, and supplies domestic hot water to residents through the first hot water outlet pipe 16.

[0029] When the outlet water temperatures of the solar water heater 5 and the heat pump water heater 6 do not meet the specified outlet water temperature requirements, and the outlet water flow rates of the solar water heater 5 and the heat pump water heater 6 are insufficient to supply water to the gas-assisted heating mechanism 4, the two water inlet ends of the outlet water four-way solenoid valve 19 and the outlet water end of the second hot water outlet pipe 17 are closed, and then the water supply pump 2 directly supplies water to the gas-assisted heating mechanism 4 through the main water pipe 3, the water supply four-way solenoid valve 7, and the third diversion pipe 10, and the water flows into the preheating water pipe 24 through the diversion check valve 23, and finally flows into the heating water pipe 27. At this time, the gas enters the gas ignition mechanism 22 through the gas delivery pipe 29, and the gas ignition mechanism 22 uses the gas to heat the water flowing inside the heating water pipe 27. When the water inside the heating water pipe 27 is heated to meet the outlet water temperature requirements, the water inside the heating water pipe 27 enters the first hot water outlet pipe 16 along the reflux pipe 15 and the check valve 2 30, and supplies domestic hot water to residents through the first hot water outlet pipe 16.

[0030] The present invention optimizes and controls the solar water heater, heat pump water heater and gas-assisted heating mechanism, preferentially utilizes solar energy and environmental heat sources for water heating, and uses gas as a supplementary energy source, thereby achieving energy-saving, environmentally friendly, healthy and sustainable hot water supply.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A multi-energy complementary centralized domestic hot water supply system, characterized in that: The invention comprises a control terminal (1), a water supply pump (2), a gas-assisted heating mechanism (4), a solar water heater (5) and a heat pump water heater (6), wherein the water inlet of the water supply pump (2) is connected to a municipal water supply network pipe, the water outlet of the water supply pump (2) is connected to a water inlet of a main water pipe (3), the water outlet of the main water pipe (3) is connected to a water supply four-way solenoid valve (7), the water supply four-way solenoid valve (7) has a water inlet and three water outlets, the three water outlets of the water supply four-way solenoid valve (7) are respectively connected to a first shunt pipe (8), a second shunt pipe (9) and a third shunt pipe (10), the first shunt pipe (8) is connected to the water inlet of the heat pump water heater (6), the second shunt pipe (9) is connected to the water outlet of the main water pipe (3), and the water supply four-way solenoid valve (7) is connected to the water outlet of the main water pipe (3). (9) is connected to the water inlet end of the solar water heater (5), the third diverter pipe (10) is connected to the gas-assisted heating mechanism (4), the water outlet end of the solar water heater (5) is connected to the second water outlet pipe (12), the water outlet end of the heat pump water heater (6) is connected to the first water outlet pipe (11), the other ends of the first water outlet pipe (11) and the second water outlet pipe (12) are commonly connected to a hot water outlet tank (13), the other end of the hot water outlet tank (13) is installed with a first hot water outlet pipe (16) and a second hot water outlet pipe (17), and a guide pipe (14) and a return pipe (15) are installed between the hot water outlet tank (13) and the gas-assisted heating mechanism (4).

2. A multi-energy complementary centralized domestic hot water supply system according to claim 1, characterized in that: A water outlet four-way solenoid valve (19), a one-way solenoid valve (20) and a one-way solenoid valve (30) are installed inside the hot water outlet tank (13); the water outlet four-way solenoid valve (19) has two water inlet ends and two water outlet ends.

3. A multi-energy complementary centralized domestic hot water supply system according to claim 2, characterized in that: The first water outlet pipe (11) and the second water outlet pipe (12) are respectively connected to two water inlet ends of a water outlet four-way solenoid valve (19); a temperature sensor 1 (18) and a flow sensor 1 (21) are installed on the first water outlet pipe (11) at a position close to the water outlet four-way solenoid valve (19); a temperature sensor 2 (31) and a flow sensor 2 (32) are installed on the second water outlet pipe (12) at a position close to the water outlet four-way solenoid valve (19); and the water supply pump (2), the temperature sensor 1 (18), the temperature sensor 2 (31), the flow sensor 1 (21) and the flow sensor 2 (32) are all electrically connected to the control terminal (1).

4. A multi-energy complementary centralized domestic hot water supply system according to claim 3, characterized in that: One water outlet end of the water outlet four-way solenoid valve (19) is connected to one end of the second hot water outlet pipe (17), and the other water outlet end of the water outlet four-way solenoid valve (19) is connected to an intermediate water pipe (28).

5. A multi-energy complementary centralized domestic hot water supply system according to claim 4, characterized in that: The other end of the intermediate water pipe (28) is connected to the water inlet end of the one-way solenoid valve (20), and the water outlet end of the one-way solenoid valve (20) is connected to one end of the guide pipe (14).

6. A multi-energy complementary centralized domestic hot water supply system according to claim 5, characterized in that: The water inlet end of the second one-way solenoid valve (30) is connected to the return pipe (15), and the water outlet end of the second one-way solenoid valve (30) is connected to one end of the first hot water outlet pipe (16).

7. A multi-energy complementary centralized domestic hot water supply system according to claim 6, characterized in that: A gas ignition mechanism (22) is fixedly installed inside the gas-assisted heating mechanism (4); a gas heating box (25) is installed on the top of the gas ignition mechanism (22); a heat-conducting sleeve (26) is inlaid on the outer surface of the gas heating box (25); a gas delivery pipe (29) is fixed to the bottom end of the gas ignition mechanism (22); one end of the gas delivery pipe (29) passes through the gas-assisted heating mechanism (4) and is connected to the gas pipe.

8. A multi-energy complementary centralized domestic hot water supply system according to claim 7, characterized in that: A drainage check valve (23) is installed below the heat-conducting sleeve (26). The drainage check valve (23) is fixed to the outer wall of the gas heating box (25). The drainage check valve (23) has two water inlet ends and one water outlet end. The drainage pipe (14) and the third diverter pipe (10) are respectively connected to the two water inlet ends of the drainage check valve (23).

9. A multi-energy complementary centralized domestic hot water supply system according to claim 8, characterized in that: The water outlet end of the drainage check valve (23) is connected to a preheating water pipe (24), the preheating water pipe (24) being spirally wound around the outside of the heat-conducting sleeve (26), a heating water pipe (27) being installed in the gas heating box (25), the top end of the preheating water pipe (24) passing through the gas heating box (25) and connected to the top end of the heating water pipe (27), the bottom end of the heating water pipe (27) passing through the gas heating box (25) and connected to the return pipe (15).

10. A multi-energy complementary centralized domestic hot water supply system according to claim 9, characterized in that: The outer surface of the heat-conducting sleeve (26) is provided with a spiral groove, and the heat-conducting sleeve (26) is clamped in the spiral groove.

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