Electric energy and solar photovoltaic energy storage drinking water boiler

Abstract

This utility model relates to an electric and solar photovoltaic energy storage drinking water dispenser, including a thermal energy storage device and a heat exchange coil installed in the thermal energy storage device. The inlet of the heat exchange coil is connected to a cold water source, and the outlet of the heat exchange coil is connected to an outlet pipe. A temperature sensor, a temperature regulating valve, a hot water storage tank, and a drain valve are installed on the outlet pipe. The temperature sensor, temperature regulating valve, hot water storage tank, and drain valve are arranged sequentially along the water outlet direction. An exhaust port is provided on the top of the hot water storage tank, and the volume of the hot water storage tank is larger than the volume of the heat exchange coil. This utility model, by setting up a thermal energy storage device, facilitates heating using off-peak electricity. The heat stored in the thermal energy storage device is used to heat the cold water in the heat exchange coil, avoiding the load on the circuit due to instantaneous high power. By setting up a hot water storage tank and a temperature control valve, water that reaches 100°C in the heat exchange coil flows to the hot water storage tank, avoiding repeated heating of the water in the heat exchange coil.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to the field of solar thermal utilization, specifically referring to an electric and solar photovoltaic energy storage drinking water dispenser. Background Technology

[0002] Water boilers are indispensable electrical appliances in daily life. By boiling cold water with these boilers, people can make drinking water more beneficial to their health.

[0003] Currently, hot water equipment mainly includes instantaneous heating and storage heating. Instantaneous heating provides instantaneous heating, meeting the demand for urgently needed hot water, while storage heating stores water, meeting the demand for larger volumes of water. However, both instantaneous and storage heating still have shortcomings. For example, instantaneous heating requires high power to directly heat cold water to the target temperature, placing high demands on the electrical circuit; storage heating (such as water dispensers and electric kettles) maintains water temperature through repeated heating, resulting in higher energy consumption. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing an electric and solar photovoltaic energy storage drinking water dispenser that heats cold water while avoiding the instantaneous high power problem of instantaneous heating and the repeated heating problem of storage-type water heaters.

[0005] This utility model is achieved through the following technical solution: providing an electric and solar photovoltaic energy storage drinking water dispenser, including a thermal energy storage device and a heat exchange coil installed in the thermal energy storage device. The inlet of the heat exchange coil is connected to a cold water source located outside the thermal energy storage device through an inlet pipe. The outlet of the heat exchange coil is connected to an outlet pipe extending outside the thermal energy storage device. A temperature sensor, a temperature regulating valve, a hot water storage tank, and a drain valve are installed on the outlet pipe. The temperature sensor, temperature regulating valve, hot water storage tank, and drain valve are arranged sequentially along the water outlet direction. An exhaust port is provided on the top of the hot water storage tank. The volume of the hot water storage tank is larger than the volume of the heat exchange coil.

[0006] In operation, this system utilizes the heat stored in the thermal energy storage device to heat the cold water in the heat exchange coil. The heated water then flows through a temperature regulating valve into a hot water storage tank. To draw water, simply open the drain valve. Because the hot water storage tank has a larger volume than the heat exchange coil and includes an vent, all the water in the heat exchange coil can flow into the hot water storage tank, preventing repeated heating of the water within the coil. By using a temperature regulating valve, the water flow is reduced or shut off before the cold water reaches 100°C, extending the time the cold water spends in the heat exchange coil. When the temperature reaches 100°C, the regulating valve opens, allowing the hot water to flow out of the heat exchange coil.

[0007] As an optimization, the temperature regulating valve includes a valve body with an inner cavity. The top of the valve body has an inlet hole communicating with the inner cavity, and the bottom of the valve body has an outlet hole communicating with the inner cavity. A bimetallic strip covers the outlet hole. The inner wall of the valve body has a groove adapted to the bimetallic strip. One end of the bimetallic strip is fixed to the valve body, and the inner wall of the valve body has a receiving groove for the other end of the bimetallic strip to deform and pass through. This optimized temperature regulating valve uses a bimetallic strip structure, which is simple in structure and low in manufacturing cost.

[0008] As an optimization, the valve housing includes an upper valve body and a lower valve body, and the inner cavity is formed by the upper and lower valve bodies fastening together. The upper and lower valve bodies are detachably fixed together, with the inlet hole located in the upper valve body and the outlet hole located in the lower valve body. This optimized valve housing adopts a detachable upper and lower valve body structure, which facilitates the processing of the receiving groove and also makes it convenient to install the bimetallic strip.

[0009] As an optimization, a water pump is installed on the inlet pipe, and a cold water buffer is located between the water pump and the thermal energy storage device. The cold water buffer is located on the outlet side of the water pump, and a cold water storage tank is installed on the inlet side of the water pump. The inlet of the inlet pipe is located inside the cold water storage tank. In this optimized configuration, cold water enters the cold water buffer through the action of the water pump, and then enters the heat exchange coil through the cold water buffer. By setting up the cold water buffer, cold water can be temporarily stored, ensuring the timely supply of water to the heat exchange coil.

[0010] As an optimization, the thermal energy storage device includes a housing filled with a thermal energy storage medium and a heating device for heating the thermal energy storage medium. The top of the housing is equipped with a thermal energy storage medium inlet and a thermal energy storage medium temperature detector. This optimized thermal energy storage device has a simple structure and low manufacturing cost. The thermal energy storage medium temperature detector facilitates the monitoring of the thermal energy storage medium's temperature.

[0011] As an optimization, the heating device includes several electric heating rods inserted and fixed to the side wall of the housing. The heating portion of each electric heating rod extends into the thermal energy storage medium. A heat-conducting sleeve is fitted and fixed onto the heating portion of each electric heating rod. The inner wall of the heat-conducting sleeve is in contact with the electric heating rod, and several radially extending heat exchange fins are fixed to the outer wall of the heat-conducting sleeve. This optimized solution provides protection for the heating rods by using the heat-conducting sleeve, and ensures the heat conduction efficiency between the electric heating rods and the heat-conducting sleeve by utilizing the close contact between the heat-conducting sleeve and the electric heating rods. The addition of heat exchange fins improves the heat exchange efficiency with the energy storage medium.

[0012] As an optimization, several heat exchange fins are fixed on the outer wall of the heat exchange coil, and the heat exchange fins of the heat-conducting sleeve are in contact with the heat exchange fins of its adjacent heat exchange coil. This optimization scheme, by setting heat exchange fins on the heat exchange coil and connecting the heat exchange fins of the heat exchange coil with the heat exchange fins of the heat-conducting sleeve, makes the heat exchange fins form a mesh structure, further improving the heat exchange efficiency.

[0013] The beneficial effects of this utility model are as follows: by setting up a thermal energy storage device, it is convenient to use off-peak electricity for heating. The heat stored in the thermal energy storage device is used to heat the cold water in the heat exchange coil, avoiding the load on the circuit due to instantaneous high power. By setting up a hot water storage tank and a temperature control valve, the water in the heat exchange coil that reaches 100°C flows to the hot water storage tank, avoiding the water in the heat exchange coil being repeatedly heated. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the process structure of this utility model;

[0015] Figure 2 This is a schematic diagram of a temperature control valve.

[0016] Figure 3 for Figure 2 Sectional view of AA;

[0017] Figure 4 for Figure 2 BB section view;

[0018] Figure 5 This is a schematic diagram of the electric heating rod structure;

[0019] As shown in the figure:

[0020] 1. Heating device; 2. Thermal energy storage medium temperature detector; 3. Thermal energy storage device; 4. Heat exchange coil; 5. Thermal energy storage medium inlet; 6. Controller; 7. Solar photovoltaic power generation device; 8. External power supply; 9. Battery energy storage device; 10. Temperature sensor; 11. Temperature regulating valve; 12. Hot water storage tank; 13. Drain valve; 14. Cold water buffer; 15. Water pump; 16. Cold water storage tank; 17. Inlet pipe; 18. Outlet pipe; 19. Upper valve body; 20. Inlet hole; 21. Outlet hole; 22. Bimetallic strip; 23. Lower valve body; 24. Exhaust port; 25. Heat exchange fins; 26. Heat-conducting sleeve; 27. Electric heating rod. Detailed Implementation

[0021] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0022] like Figure 1 The present invention relates to an electric and solar photovoltaic energy storage drinking water dispenser, comprising a thermal energy storage device 3 and a heat exchange coil 4 disposed in the thermal energy storage device 3. The inlet of the heat exchange coil is connected to a cold water source located outside the thermal energy storage device through an inlet pipe 17. The outlet of the heat exchange coil is connected to an outlet pipe 18 extending outside the thermal energy storage device. Cold water from the cold water source enters the heat exchange coil and uses the heat stored in the thermal energy storage device to heat the water in the heat exchange coil. The hot water heated to the set temperature flows out through the outlet pipe.

[0023] The thermal energy storage device includes a box filled with a thermal energy storage medium and a heating device 1 for heating the thermal energy storage medium. The top of the box is provided with a thermal energy storage medium inlet 5 and a thermal energy storage medium temperature detector 2. The thermal energy storage medium inlet 5 is used to fill the box with the thermal energy storage medium, and the thermal energy storage medium temperature detector 2 is used to detect the temperature of the thermal energy storage medium.

[0024] The heating device 1 includes several electric heating rods 27 inserted and fixed to the side wall of the box. The heating part of the electric heating rod 27 extends to the heat storage medium. A heat-conducting sleeve 26 is sleeved and fixed on the heating part of the electric heating rod. The inner wall of the heat-conducting sleeve 26 is in contact with the electric heating rod 27. Several radially extending heat exchange fins 25 are fixed on the outer wall of the heat-conducting sleeve 26.

[0025] Several heat exchange fins are fixed on the outer wall of the heat exchange coil, and the heat exchange fins of the heat-conducting sleeve are in contact with the heat exchange fins of the adjacent heat exchange coil, so that the heat exchange fins of the heat-conducting sleeve and the heat exchange fins of the heat exchange coil form a mesh, which improves the heat exchange efficiency.

[0026] In this embodiment, the electric heating rods are arranged in two groups, upper and lower. Depending on the power, there are one or more electric heating rods in each group. When the sunlight intensity is insufficient to allow the solar photovoltaic power generation device 7 to operate at full load before 8:30 am and after 5:00 pm, the electricity generated by the solar photovoltaic power generation device 7 can power one group of electric heating rods, thereby improving heating efficiency.

[0027] A temperature sensor 10, a temperature regulating valve 11, a hot water storage tank 12, and a drain valve 13 are installed on the water outlet pipe 18. These components are arranged sequentially along the water outlet direction. An exhaust port 24 is located at the top of the hot water storage tank, which is lower than the thermal energy storage device in height. The volume of the hot water storage tank 12 is larger than the volume of the heat exchange coil 4; in this embodiment, the volume of the hot water storage tank 12 is 2 to 3 times the volume of the heat exchange coil 4. The drain valve 13 is a solenoid valve for easy control of its opening.

[0028] The temperature regulating valve 11 includes a valve housing with an inner cavity. The top of the valve housing has an inlet hole 20 communicating with the inner cavity, and the bottom of the valve housing has an outlet hole 21 communicating with the inner cavity. A bimetallic strip 22 covers the outlet hole. The inner wall of the valve housing has a placement groove adapted to the bimetallic strip. One end of the bimetallic strip 22 is fixed to the valve housing. The inner wall of the valve housing has a receiving groove for the bimetallic strip to deform through, and the other end of the bimetallic strip is pressed against the groove wall. The depth of the placement groove can be measured experimentally. The bimetallic strip is existing technology. When the temperature of the heat storage medium is lower than a set lower limit, the temperature of the hot water flowing out of the heat exchange coil does not reach 100℃. At this time, the deformation of the bimetallic strip cannot exceed the height of the placement groove, and the outlet hole cannot be opened (partial leakage is possible), thereby reducing the water flow rate in the heat exchange coil and prolonging the heating time. When the temperature of the hot water flowing out of the heat exchange coil reaches 100℃, the bimetallic strip deforms and rises above the placement groove, the water outlet opens, and the hot water can flow out normally from the water outlet.

[0029] To facilitate disassembly and the machining of the placement groove for easy installation of the bimetallic strip, the valve housing in this embodiment includes an upper valve body 19 and a lower valve body 23. The inner cavity is formed by the upper valve body 19 and the lower valve body 23 fastening together. The upper and lower valve bodies are detachably fixed together. The water inlet is located in the upper valve body, and the water outlet is located in the lower valve body. The detachable fixed connection between the upper and lower valve bodies can be achieved by bolts or by threads.

[0030] A water pump 15 is installed on the water inlet pipe 17, and a cold water buffer 14 is located between the water pump 15 and the thermal energy storage device 3. The cold water buffer 14 is located on the water outlet side of the water pump 15, and a cold water storage device 16 is provided on the water inlet side of the water pump 15. The cold water storage device 16, which contains cold water, forms a cold water source. The water inlet of the water inlet pipe is located inside the cold water storage device.

[0031] This embodiment also includes a controller 6, a battery energy storage device 9, a solar photovoltaic power generation device 7, and an external power source 8. The external power source is daily electricity. The solar photovoltaic power generation device 7 converts solar energy into electrical energy. During peak electricity consumption periods, the electrical energy converted by the solar photovoltaic power generation device 7 powers the heating device 1. During off-peak electricity consumption periods or on cloudy or rainy days, the external power source powers the heating device 1. If there is any surplus electrical energy generated by the solar photovoltaic power generation device, it is stored in the battery energy storage device for use in household lighting and other electrical facilities. The controller 6 is electrically connected to the drain valve 13, temperature sensor 10, heating device 1, thermal energy storage medium temperature detector 2, water pump 15, battery energy storage device 9, solar photovoltaic power generation device 7, and external power source 8, respectively.

[0032] The electricity generated by the solar photovoltaic power generation device is supplied to the electric heating rod via the controller to heat the thermal energy storage medium. When the temperature of the thermal energy storage medium rises to the upper limit of the set value, the power supply to the electric heating rod is stopped. The electricity generated by the solar photovoltaic power generation device is then stored in the battery energy storage device 9. The DC power stored in the battery energy storage device 9 is used for lighting, the controller, and the electric heating rod. When the temperature of the thermal energy storage medium drops to the lower limit of the set value due to the use of hot water, the electricity generated by the solar photovoltaic power generation device is again supplied to the electric heating rod via the controller to heat the thermal energy storage medium. This process repeats, completing the cycle of the water dispenser. When it is cloudy or at night without sunlight, and the energy stored in the thermal energy storage device is insufficient to heat the water, an external power source can be used to provide electricity to heat the thermal energy storage medium.

[0033] The working process of the water dispenser in this embodiment:

[0034] Cold water in the cold water storage tank is pumped into the cold water buffer, then into the heat exchange coil. As the cold water passes through the heat exchange coil, it undergoes heat exchange and is heated to 100°C before flowing into the hot water storage tank. Opening the drain valve provides drinking water. To use, press the "On" button; the water pump and drain valve will open simultaneously, and the cold water will be heated in the above sequence for drinking. To stop dispensing hot water, press the "Off" button; the water pump will shut off, and the drain valve will close after a 3-second delay, allowing as much water as possible to drain from the heat exchange coil. The remaining hot water is stored in the hot water storage tank, which is insulated. After the drain valve closes, any remaining water in the heat exchange coil will automatically flow into the hot water storage tank.

[0035] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. An electric and solar photovoltaic energy storage drinking water dispenser, comprising a thermal energy storage device (3) and a heat exchange coil (4) disposed in the thermal energy storage device (3), wherein the inlet of the heat exchange coil is connected to a cold water source located outside the thermal energy storage device via an inlet pipe (17), and the outlet of the heat exchange coil is connected to an outlet pipe (18) extending outside the thermal energy storage device, characterized in that: A temperature sensor (10), a temperature regulating valve (11), a hot water storage tank (12), and a drain valve (13) are installed on the water outlet pipe (18). The temperature sensor (10), temperature regulating valve (11), hot water storage tank (12), and drain valve (13) are arranged sequentially along the water outlet direction. An exhaust port is provided on the top of the hot water storage tank. The volume of the hot water storage tank (12) is greater than the volume of the heat exchange coil (4).

2. The electric and solar photovoltaic energy storage drinking water dispenser according to claim 1, characterized in that: The temperature regulating valve (11) includes a valve shell with an inner cavity. The top of the valve shell has an inlet hole (20) that communicates with the inner cavity, and the bottom of the valve shell has an outlet hole (21) that communicates with the inner cavity. A bimetallic strip (22) is covered above the outlet hole. The inner wall of the valve shell has a placement groove that matches the bimetallic strip. One end of the bimetallic strip (22) is fixed to the valve shell. The inner wall of the valve shell has a receiving groove for the bimetallic strip to deform and pass through.

3. The electric and solar photovoltaic energy storage drinking water dispenser according to claim 2, characterized in that: The valve housing includes an upper valve body (19) and a lower valve body (23). The inner cavity is formed by the upper valve body (19) and the lower valve body (23) being fastened together. The upper valve body and the lower valve body are detachably fixed together. The water inlet is opened on the upper valve body and the water outlet is opened on the lower valve body.

4. The electric and solar photovoltaic energy storage drinking water dispenser according to claim 1, characterized in that: A water pump (15) is installed on the water inlet pipe (17), and a cold water buffer (14) is located between the water pump (15) and the thermal energy storage device (3). The cold water buffer (14) is located on the outlet side of the water pump (15), and a cold water storage device (16) is provided on the inlet side of the water pump (15). The inlet of the water inlet pipe is located inside the cold water storage device.

5. The electric and solar photovoltaic energy storage drinking water dispenser according to claim 1, characterized in that: The thermal energy storage device includes a box filled with thermal energy storage medium and a heating device (1) for heating the thermal energy storage medium. The top of the box is provided with a thermal energy storage medium inlet (5) and a thermal energy storage medium temperature detector (2).

6. The electric and solar photovoltaic energy storage drinking water dispenser according to claim 5, characterized in that: The heating device (1) includes several electric heating rods (27) inserted and fixed to the side wall of the box. The heating part of the electric heating rod (27) extends to the heat storage medium. A heat-conducting sleeve (26) is sleeved and fixed on the heating part of the electric heating rod. The inner wall of the heat-conducting sleeve (26) is in contact with the electric heating rod (27). Several radially extending heat exchange fins (25) are fixed on the outer wall of the heat-conducting sleeve (26).

7. A drinking water dispenser with electrical energy and solar photovoltaic energy storage according to claim 6, characterized in that: Several heat exchange fins are fixed on the outer wall of the heat exchange coil, and the heat exchange fins of the heat-conducting sleeve are in contact with the heat exchange fins of its adjacent heat exchange coil.

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