Domestic hot water supply system

Abstract

The invention provides a domestic hot water supply system which comprises an air energy heat pump, a water storage tank, a gas water heater, a hot water end and a cold water end, a heat exchange pipe is arranged in the water storage tank, and a cold water pipe, a first backflow pipe and a first hot water outlet pipe are fixedly connected to the water storage tank; the other end of the first hot water outlet pipe is fixedly connected to the cold water input end of the gas water heater, the hot water output end of the gas water heater is fixedly connected with a second hot water outlet pipe, the second hot water outlet pipe and the backflow pipe are arranged at the hot water using end in a matched mode, and a connecting pipe is arranged between the first hot water outlet pipe and the second hot water outlet pipe. A second electric control valve is arranged on the connecting pipe, a third electric control valve is arranged on the first hot water outlet pipe and located between the connecting pipe and the gas water heater, and a first electric control valve is arranged on the second hot water outlet pipe. The air energy heat pump and the gas water heater are combined, and the system has the advantages of meeting the water use requirement and being low in energy consumption.

Description

Technical Field

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

[0002] Hot water is needed in production and life. Common sources of hot water in life: 1. Use utensils to boil water, but most of the methods are for drinking; 2. Use solar water heaters, but the water use is unstable, and solar water heaters are not suitable for high-rise buildings nowadays; 3. Electric water heaters, which are convenient to use, but have high energy consumption; 4. Gas water heaters, which are as convenient to use as electric water heaters, and can deliver hot water at any time according to needs, instead of pre-heating like electric water heaters; 5. Air energy heat pumps, which transfer heat from the air and heat water, have relatively low energy consumption, but the water temperature is relatively low.

[0003] And in cold areas, radiators are used to heat the room in winter. If the above method is used alone, the cost of living is high. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a domestic hot water supply system, comprising an air energy heat pump, a water storage tank, a gas water heater, a hot water end and a cold water end; The water tank is provided with a heat exchange tube inside, and the input end and the output end of the air energy heat pump are fixedly connected with copper tubes, and the copper tubes are respectively connected to the ends of the heat exchange tubes. The air heat energy pump transfers the heat in the air to the water tank, that is, heats the water in the water tank.

[0005] The water storage tank is fixedly connected with a cold water pipe, a return pipe and a first hot water outlet pipe, the other end of the first hot water outlet pipe is fixedly connected to the cold water input end of the gas water heater, the hot water output end of the gas water heater is fixedly connected with a second hot water outlet pipe, and the second hot water outlet pipe and the return pipe are respectively matched with the hot water end. That is, the water in the water storage tank is preliminarily heated by the air heat pump, and then sent to the gas water heater for further heating treatment to obtain a higher water temperature. This method can reduce the use of gas and has the advantage of reducing energy consumption.

[0006] A connecting pipe is provided between the first hot water outlet pipe and the second hot water outlet pipe, a second electric control valve is provided on the connecting pipe, a third electric control valve is provided on the first hot water outlet pipe, and the third electric control valve is located between the connecting pipe and the gas water heater, and a first electric control valve is provided on the second hot water outlet pipe, and the first electric control valve is located between the connecting pipe and the hot water end. When warm water is needed, the first and second electric control valves are opened to use water in the water storage tank, and when hot water is needed, the first and third electric control valves are opened, and the second electric control valve is closed. In addition, after the gas water heater is finished working, due to the hysteresis of heat conduction, the internal heating components of the gas water heater have heat, which can be passed through the reflux pipe, so that the hot water circulates in the pipeline for a period of time, avoiding heat accumulation inside the gas water heater and making full use of the heat.

[0007] Preferably, a check valve is provided on the cold water pipe, which is connected to a tap water pipe to fill the water storage tank, and the check valve prevents water from flowing back.

[0008] Preferably, the cold water pipe is provided with a branch pipe, and the branch pipe is connected to the cold water end. The cold water end is for household water.

[0009] Preferably, the second hot water outlet pipe is provided with an exhaust valve, and the exhaust valve is located between the first electric control valve and the hot water end. The exhaust valve exhausts the gas in the pipeline.

[0010] Preferably, a circulation pump is provided on the return pipe. The circulation pump is started to realize the return of hot water to the water storage tank. In addition to bathing and other uses, the hot water end can also be connected to a radiator, and the water returned from the radiator enters the water storage tank through the return pipe.

[0011] Preferably, the system further comprises a control module, a temperature selection module is provided at the end of the hot water end, and the control module is communicatively connected with the temperature selection module, the first electric control valve, the second electric control valve and the third electric control valve. The temperature selection module has multiple gear settings, such as "low temperature", "medium temperature" and "high temperature", and the control module links the first electric control valve, the second electric control valve and the third electric control valve, as well as the gas water heater according to the set gear, so that the output water temperature meets the set requirements.

[0012] Preferably, the system further comprises a heat exchanger, which is arranged in the exhaust pipe of the gas water heater, and the cold water pipe passes through the heat exchanger and then communicates with the water storage tank. The heat in the flue gas generated by the gas water heater is recovered to further improve the heat utilization efficiency, thereby achieving the purpose of energy saving.

[0013] The beneficial effects of the present invention are as follows: 1. Preheat the water through an air energy heat pump, and then use a gas water heater to heat it to obtain high-temperature water. At the same time, its energy consumption is relatively low, and it has the advantages of being green and environmentally friendly.

[0014] 2. The delayed first electric control valve, the second electric control valve, the third electric control valve and other components can meet the use requirements of different water temperatures. In addition, the hot water supply system can meet the use of equipment such as radiators. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the present invention.

[0016] List of reference numerals: 1. Air energy heat pump; 2. Copper tube; 3. Heat exchange tube; 4. Water storage tank; 5. First hot water outlet pipe; 6. Cold water pipe; 7. Connecting pipe; 8. Return pipe; 9. Check valve; 10. Hot water end; 11. Cold water end; 12. Second hot water outlet pipe; 13. Exhaust valve; 14. First electric control valve; 15. Second electric control valve; 16. Third electric control valve; 17. Gas water heater. DETAILED DESCRIPTION

[0017] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0018] like Figure 1 As shown, a domestic hot water supply system includes an air energy heat pump 1, a water storage tank 4, a gas water heater 17, a hot water end 10 and a cold water end 11. In addition to being connected to a shower, a hot water faucet, etc., the hot water end 10 can also be connected to a radiator, etc., wherein the former is a water-consuming type, and the latter indirectly uses the heat in the hot water without consuming water.

[0019] The water tank 4 is provided with a heat exchange tube 3 inside, and the input and output ends of the air energy heat pump 1 are fixedly connected with a copper tube 2, and the copper tube 2 is respectively connected to the ends of the heat exchange tube 3. The air energy heat pump 1 absorbs heat from the air and transfers the heat to the water tank 4 through the medium and the heat exchange tube 3.

[0020] The water storage tank 4 is fixedly connected with a cold water pipe 6, a return pipe 8 and a first hot water outlet pipe 5. The cold water pipe 6 is connected to the tap water pipe, and the return pipe 8 is connected to the output end of a heat-using device such as a radiator. The other end of the first hot water outlet pipe 5 is fixedly connected to the cold water input end of the gas water heater 17. The hot water output end of the gas water heater 17 is fixedly connected with a second hot water outlet pipe 12. The second hot water outlet pipe 12 and the return pipe 8 are respectively matched at the hot water end 10. The purpose of setting up the gas water heater 17 is to obtain a higher water temperature. The air energy heat pump 1 has a relatively low water temperature after heating, but the energy consumption is relatively low, while the gas water heater 17 can obtain water with a higher temperature, but the energy consumption is relatively high. The combination of the two can meet the water demand while reducing energy consumption.

[0021] A connecting pipe 7 is arranged between the first hot water outlet pipe 5 and the second hot water outlet pipe 12, a second electrically-controlled valve 15 is arranged on the connecting pipe 7, a third electrically-controlled valve 16 is arranged on the first hot water outlet pipe 5, and the third electrically-controlled valve 16 is located between the connecting pipe 7 and the gas water heater 17, a first electrically-controlled valve 14 is arranged on the second hot water outlet pipe 12, and the first electrically-controlled valve 14 is located between the connecting pipe 7 and the hot water end 10.

[0022] When using low water temperature, the first electrically controlled valve 14 and the second electrically controlled valve 15 are opened, and the water in the water storage tank 4 is used directly. When using high water temperature, the first electrically controlled valve 14 and the third electrically controlled valve 16 are opened, and the gas water heater 17 works.

[0023] A check valve 9 is provided on the cold water pipe 6. The check valve 9 is used to prevent the water in the storage box 4 from flowing back to the water pipe when the water supply is stopped.

[0024] The cold water pipe 6 is provided with a branch pipe, and the branch pipe and the cold water end 11 are connected.

[0025] An exhaust valve 13 is provided on the second hot water outlet pipe 12, and the exhaust valve 13 is located between the first electric control valve 14 and the hot water use end 10. The exhaust valve 13 exhausts the air in the pipeline.

[0026] A circulation pump is provided on the return pipe 8. The refluxed hot water flows back into the storage tank 4 through the circulation pump.

[0027] The system also includes a control module, a temperature selection module is provided at the end of the hot water end 10, and the control module is in communication with the temperature selection module, the first electric control valve 14, the second electric control valve 15 and the third electric control valve 16. The temperature selection module can set the water outlet temperature selection range, and control the first electric control valve 14, the second electric control valve 15 and the third electric control valve 16 to meet the water demand through the control module.

[0028] The system also includes a heat exchanger, which is arranged in the exhaust pipe of the gas water heater 17. The cold water pipe 6 passes through the heat exchanger and then communicates with the water storage tank 4. The heat in the flue gas generated by the gas water heater 17 is absorbed to further improve the heat utilization efficiency.

[0029] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. A domestic hot water supply system, characterized in that: It comprises an air energy heat pump (1), a water storage tank (4), a gas water heater (17), a hot water end (10) and a cold water end (11); A heat exchange tube (3) is arranged inside the water storage tank (4); the input end and the output end of the air energy heat pump (1) are both fixedly connected to a copper tube (2), and the copper tube (2) is respectively connected to the end of the heat exchange tube (3); The water storage tank (4) is fixedly connected to a cold water pipe (6), a return pipe (8) and a first hot water outlet pipe (5); the other end of the first hot water outlet pipe (5) is fixedly connected to a cold water input end of a gas water heater (17); the hot water output end of the gas water heater (17) is fixedly connected to a second hot water outlet pipe (12); the second hot water outlet pipe (12) and the return pipe (8) are respectively matched to a hot water use end (10); A connecting pipe (7) is provided between the first hot water outlet pipe (5) and the second hot water outlet pipe (12); a second electrically controlled valve (15) is provided on the connecting pipe (7); a third electrically controlled valve (16) is provided on the first hot water outlet pipe (5), and the third electrically controlled valve (16) is located between the connecting pipe (7) and the gas water heater (17); a first electrically controlled valve (14) is provided on the second hot water outlet pipe (12), and the first electrically controlled valve (14) is located between the connecting pipe (7) and the hot water end (10).

2. A domestic hot water supply system according to claim 1, characterized in that: The cold water pipe (6) is provided with a check valve (9).

3. A domestic hot water supply system according to claim 1, characterized in that: The cold water pipe (6) is provided with a branch pipe, and the branch pipe is connected to the cold water end (11).

4. A domestic hot water supply system according to claim 1, characterized in that: The second hot water outlet pipe (12) is provided with an exhaust valve (13), and the exhaust valve (13) is located between the first electric control valve (14) and the hot water use end (10).

5. A domestic hot water supply system according to claim 1, characterized in that: The reflux pipe (8) is provided with a circulation pump.

6. A domestic hot water supply system according to claim 1, characterized in that: The system further comprises a control module, the end of the hot water end (10) is provided with a temperature selection module, and the control module is communicatively connected with the temperature selection module, the first electric control valve (14), the second electric control valve (15) and the third electric control valve (16).

7. A domestic hot water supply system according to claim 1, characterized in that: The system also includes a heat exchanger, which is arranged in the smoke exhaust pipe of the gas water heater (17). The cold water pipe (6) passes through the heat exchanger and then communicates with the water storage tank (4).

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