Novel solar energy and air energy combined heat storage water tank

Abstract

The utility model relates to the technical field of solar equipment, and particularly discloses a novel solar energy and air energy combined heat storage water tank which comprises a controller, a solar heat collection device, an air energy heating device and a cylindrical stainless steel liner water tank, the outer wall of the inner container water tank is coated with a gradient heat preservation layer, and the gradient heat preservation layer sequentially comprises a high-density polyurethane foaming layer, an aerogel felt layer and a vacuum heat insulation plate layer from outside to inside; a double-spiral coil pipe group and a flow guide partition plate which is positioned in the inner container water tank and is provided with a through hole are coaxially arranged in the inner container water tank; the double-spiral coil pipe group comprises an outer spiral coil pipe and an inner spiral coil pipe; the water inlet end of the outer spiral coil pipe is connected with an outlet pipeline of a solar heat collector in the solar heat collection device; according to the heat storage liner water tank, efficient heat exchange is achieved through the double-spiral coil pipe, heat insulation is achieved through the gradient heat preservation layer, water flow is optimized through the flow guide partition plate, parts are reliable, overhauling and monitoring are convenient, and efficient, energy-saving, stable and easy-to-manage hot water supply is achieved.

Description

Technical Field

[0001] This utility model relates to the field of solar energy equipment technology, and specifically discloses a novel solar-air-energy combined hot water storage tank. Background Technology

[0002] With the increasing severity of the energy crisis and environmental problems, renewable energy sources such as solar and air energy are being used more and more widely in the field of hot water supply. However, existing thermal storage tanks that combine solar and air energy still have many shortcomings in terms of structural design, thermal efficiency improvement, and system stability.

[0003] A novel solar-air source combined hot water storage tank, currently disclosed in patent CN212806101U, reduces costs by attaching heat exchange coils to the inner wall of the tank and utilizes a complementary heating system of solar collectors and air source heat pumps. However, this technology still has the following drawbacks:

[0004] 1. The heat exchange area is limited, and the contact thermal resistance between the coil and the inner wall of the water tank is relatively large, resulting in low heat exchange efficiency, especially under high load conditions, it is difficult to meet the demand for rapid heating.

[0005] 2. Due to the lack of an effective flow guiding structure, hot and cold water mix severely, temperature stratification is not obvious, and the temperature difference between the upper and lower layers is insufficient, which affects the efficiency of hot water use.

[0006] 3. The solar and air energy systems operate independently, failing to achieve efficient synergy of heat sources, resulting in a significant decrease in the coefficient of performance (COP) during cloudy or rainy weather or in low-temperature environments.

[0007] To address the aforementioned issues, there is an urgent need for a new type of thermal storage tank that combines solar and air energy sources. This tank can improve heat exchange efficiency, optimize temperature stratification, enhance the synergy of the two energy sources, and improve the reliability and temperature control accuracy of the system. Utility Model Content

[0008] This utility model proposes a novel solar-air-energy combined hot water storage tank. This novel solar-air-energy combined hot water storage tank uses a double spiral coil group for efficient heat exchange to make full use of clean energy. The gradient insulation layer effectively insulates the water and reduces heat loss. The flow guide baffle optimizes water flow and improves the heat exchange effect. The reliable component design ensures operation and lifespan. Moreover, the inspection port and temperature sensor facilitate monitoring and maintenance, realizing an efficient, energy-saving, stable and easy-to-manage hot water supply.

[0009] This utility model is implemented as follows: a novel solar-air-source combined hot water storage tank includes a controller, a solar collector, an air-source heating device, and a cylindrical stainless steel inner tank. The outer wall of the inner tank is covered with a gradient insulation layer, which, from the outside to the inside, includes a high-density polyurethane foam layer, an aerogel felt layer, and a vacuum insulation board layer. A double-spiral coil assembly and a flow guide baffle with through holes are coaxially arranged inside the inner tank. The double-spiral coil assembly includes an outer spiral coil and an inner spiral coil. The water inlet end of the outer spiral coil is connected to the solar collector. The outlet pipe of the solar collector is connected to the return pipe of the solar collector at the water outlet end; the outer spiral coil is fixed to the inner wall of the stainless steel inner tank in a right-hand spiral manner with a pitch of 80-190mm; the inlet end of the inner spiral coil is connected to the refrigerant outlet of the air source heat pump evaporator in the air source heating device, and the outlet end is connected to the air intake of the air source heat pump compressor in the air source heating device; the inner spiral coil is coaxially nested inside the outer spiral coil in a left-hand spiral manner with a pitch of 60-90mm, and the outer side of the inner spiral coil is wrapped with aluminum silicate fiber cotton to insulate the heat of the outer spiral coil.

[0010] As a preferred embodiment of this novel solar-air energy combined hot water storage tank, the outer spiral coil is made of copper-aluminum composite pipe with a wall thickness of 1.2mm and an outer diameter of Φ25mm. Its axial coverage range is 2 / 3 of the total height of the inner tank and its lower end is ≥200mm from the bottom of the inner tank. The inner spiral coil is made of copper pipe with a wall thickness of 1.0mm and an outer diameter of Φ20mm. Its axial coverage range is 4 / 5 of the total height of the inner tank and its upper end is ≥150mm from the top of the inner tank.

[0011] As a preferred embodiment of this novel solar-air-energy combined hot water storage tank, the inclination angle of the flow guide baffles varies gradually along the water flow direction. The two flow guide baffles located at the top of the inner tank have an inclination angle of 25°, the two flow guide baffles in the middle have an inclination angle of 35°, and the two flow guide baffles at the bottom have an inclination angle of 30°. Furthermore, the distance between adjacent flow guide baffles decreases sequentially from top to bottom.

[0012] As a preferred embodiment of this novel solar-air energy combined hot water storage tank, both the inlet and outlet ends of the inner spiral coil are equipped with quick-connect fittings, and the quick-connect fittings are embedded with copper-nickel alloy filters with a mesh density of 80-100 mesh.

[0013] As a preferred embodiment of this novel solar-air-energy combined hot water storage tank, a temperature sensor mounting pipe is provided inside the gradient insulation layer. The temperature sensor mounting pipe is made of Φ6mm stainless steel pipe, with its inner end extending to the outer wall surface of the inner tank and its outer end sealed to a PT100 temperature sensor. A water level sensor is provided on the lower side wall of the inner tank, and an inlet and outlet of a solenoid valve are provided on the inner tank.

[0014] As a preferred embodiment of this novel solar-air-energy combined hot water storage tank, the inner tank has an inspection port on its side wall. The inspection port has a diameter of Φ150mm and is equipped with a double-layered tempered glass observation window.

[0015] The beneficial effects of this utility model are:

[0016] 1. By setting up a double spiral coil assembly, the outer and inner spiral coils absorb solar and air energy heat in different ways and exchange heat with the water in the inner tank. This increases the contact area between the coils and the water, improves the heat exchange efficiency, and makes full use of these two clean energy sources, achieving efficient heat collection and transfer, and effectively improving the hot water supply efficiency. Furthermore, the outer spiral coil uses a copper-aluminum composite pipe with a suitable wall thickness, while the inner spiral coil uses a copper pipe with a suitable wall thickness, ensuring the strength and heat exchange performance of the coils. At the same time, the axial coverage range is reasonably set according to the height of the inner tank, making the heat exchange more reasonable and efficient.

[0017] 2. The outer wall of the inner tank is covered with a gradient insulation layer composed of a high-density polyurethane foam layer, an aerogel felt layer, and a vacuum insulation board layer. The different insulation materials work together to effectively prevent heat loss from the inner tank, maintain the water temperature inside the tank, reduce heat loss, lower energy consumption, and ensure that the hot water remains at a high temperature for a longer period of time.

[0018] 3. The angle of the baffles inside the inner tank changes gradually along the direction of water flow, and the distance between adjacent baffles decreases from top to bottom. This changes the direction and speed of water flow, allowing the water in the inner tank to exchange heat more fully with the coils, improving heat transfer efficiency, promoting uniform water temperature distribution in the inner tank, and enhancing the quality of hot water use. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1This is a schematic diagram of the structure of the inner tank and the flow guide baffle of this utility model.

[0021] Figure 2 This is a cross-sectional structural diagram of the gradient insulation layer of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the outer spiral coil and the inner spiral coil of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the inner spiral coil and aluminum silicate fiber cotton of this utility model.

[0024] Figure 5 This is a schematic diagram of the quick-connect connector and copper-nickel alloy filter screen of this utility model.

[0025] The markings in the diagram are: 1. Inner tank; 2. Gradient insulation layer; 3. High-density polyurethane foam layer; 4. Aerogel felt layer; 5. Vacuum insulation board layer; 6. Flow guide baffle; 7. Outer spiral coil; 8. Inner spiral coil; 9. Aluminum silicate fiber cotton; 10. Quick-connect connector; 11. Copper-nickel alloy filter screen; 12. Temperature sensor mounting tube; 13. PT100 temperature sensor; 14. Water level sensor; 15. Solenoid valve; 16. Inlet; 17. Outlet; 18. Inspection port; 19. Double-layer tempered glass observation window; 20. Controller; 21. Solar thermal collector; 22. Air source heat pump. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0027] Please see Figure 1-5A novel solar-air source combined hot water storage tank includes a controller, a solar collector, an air source heating device, and a cylindrical stainless steel inner tank 1. The outer wall of the inner tank 1 is covered with a gradient insulation layer 2, which, from the outside to the inside, includes a high-density polyurethane foam layer 3, an aerogel felt layer 4, and a vacuum insulation board layer 5. A double spiral coil assembly and a flow guide baffle 6 with through holes are coaxially arranged inside the inner tank 1. The double spiral coil assembly includes an outer spiral coil 7 and an inner spiral coil 8. The water inlet end of the outer spiral coil 7 is connected to the solar collector inside the solar collector device. The outlet pipe of the device is connected to the return pipe of the solar collector at the water outlet end; the outer spiral coil 7 is fixed to the inner wall of the stainless steel inner tank 1 in a right-hand manner with a pitch of 80-190mm; the inlet end of the inner spiral coil 8 is connected to the refrigerant outlet of the air source heat pump evaporator in the air source heating device, and the outlet end is connected to the suction port of the air source heat pump compressor in the air source heating device. The inner spiral coil 8 is coaxially nested inside the outer spiral coil 7 in a left-hand manner with a pitch of 60-90mm, and the outer side of the inner spiral coil 8 is wrapped with aluminum silicate fiber cotton 9 to insulate the heat of the outer spiral coil 7.

[0028] In this embodiment: the solar collector in the solar thermal collector absorbs solar energy and converts it into heat energy to heat the heat transfer medium (water); the heated heat transfer medium enters the outer spiral coil 7 inside the inner tank 1 through the water inlet of the outer spiral coil 7. The outer spiral coil 7 is fixed to the inner wall of the stainless steel inner tank 1 in a right-hand spiral manner. When the heat transfer medium flows in the coil, it transfers heat to the water in the inner tank 1, and then flows out from the water outlet of the outer spiral coil 7, returning to the solar collector through the return pipeline for reheating, thus realizing the collection and transfer of solar heat; the air source heat pump evaporator in the air source heating device absorbs heat from the environment, causing the refrigerant to evaporate into a gaseous state. The gaseous refrigerant enters the inner spiral coil 8 from the inlet of the inner spiral coil 8, and absorbs heat from the water in the inner tank 1 during its flow in the coil, further increasing its temperature, and then flows out from the outlet of the inner spiral coil 8, entering the air source heat pump compressor. The air intake of the inner spiral coil 8 completes the absorption and transfer of heat from the air. Simultaneously, the aluminum silicate fiber cotton 9 wrapped around the outer spiral coil 7 insulates against the heat from the outer spiral coil 7, ensuring that the refrigerant in the inner spiral coil 8 primarily absorbs heat from the water in the inner tank 1. The gradient insulation layer 2 covering the outer wall of the inner tank 1 consists of a high-density polyurethane foam layer 3, an aerogel felt layer 4, and a vacuum insulation board layer 5, arranged sequentially from the outside to the inside. These insulation layers of different materials work synergistically to effectively prevent heat loss from the inner tank 1, maintaining the water temperature within the inner tank 1. The coaxially arranged double spiral coil assembly (outer spiral coil 7 and inner spiral coil 8) inside the inner tank 1 increases the contact area between the coils and the water in the inner tank 1, improving heat exchange efficiency. The internally perforated flow guide baffle 6 can change the direction and speed of water flow, allowing the water in the inner tank 1 to more fully exchange heat with the coils, further enhancing the heat transfer effect.

[0029] As a technical optimization of this utility model, the outer spiral coil 7 is a copper-aluminum composite tube with a wall thickness of 1.2mm and an outer diameter of Φ25mm. Its axial coverage range is 2 / 3 of the total height of the inner tank 1 and the lower end is ≥200mm from the bottom of the inner tank 1. The inner spiral coil 8 is a copper tube with a wall thickness of 1.0mm and an outer diameter of Φ20mm. Its axial coverage range is 4 / 5 of the total height of the inner tank 1 and the upper end is ≥150mm from the top of the inner tank 1.

[0030] In this embodiment: the outer coil covers the upper part of the inner tank 1, giving priority to heating the high-temperature water layer; the inner coil extends to the lower part of the inner tank 1, maximizing the absorption of heat from the low-temperature water; the efficiency of hot water stratification is improved, and the corrosion resistance of the copper-aluminum composite pipe is improved compared to that of pure aluminum pipe.

[0031] As a technical optimization of this utility model, the tilt angle of the flow guide baffle 6 varies in a gradient along the water flow direction. The two flow guide baffles 6 located at the upper part of the inner tank 1 have an tilt angle of 25°, the two flow guide baffles 6 in the middle have an tilt angle of 35°, and the two flow guide baffles 6 at the lower part have an tilt angle of 30°. The distance between adjacent flow guide baffles 6 decreases from top to bottom.

[0032] In this embodiment: the upper 25° inclination angle accelerates the rise of hot water, the middle 35° inclination angle suppresses turbulence, and the lower 30° inclination angle promotes the sinking of cold water. The decreasing spacing design matches the changes in water flow velocity, reduces hydraulic dead zones, thereby reducing the mixing rate of hot and cold water and shortening the heating time.

[0033] As a technical optimization of this utility model, quick-connect connectors 10 are installed at both the inlet and outlet ends of the inner spiral coil 8, and copper-nickel alloy filter screens 11 are embedded in the quick-connect connectors 10 with a mesh density of 80-100 mesh.

[0034] In this embodiment: the copper-nickel alloy filter screen 11 (80-100 mesh) intercepts impurities in the refrigerant pipeline, preventing coil blockage, and the quick-connect fitting simplifies installation and avoids thermal stress deformation caused by welding.

[0035] As a technical optimization of this utility model, a temperature sensor mounting tube 12 is provided inside the gradient insulation layer 2. The temperature sensor mounting tube 12 is made of Φ6mm stainless steel pipe, with its inner end extending to the outer wall surface of the inner tank 1 and its outer end sealed to a PT100 temperature sensor 13. A water level sensor 14 is provided on the lower side wall of the inner tank 1, and an inlet 16 and an outlet 17 of a solenoid valve 15 are provided on the inner tank 1.

[0036] In this embodiment: the data from the PT100 temperature sensor 13 and the water level sensor 14 are transmitted to the controller terminal via wired / wireless transmission. The controller is electrically connected to the two solenoid valves 15 respectively, and an external audible and visual alarm is connected to the controller via wired / wireless transmission. The stainless steel temperature sensor mounting tube 12 easily protects the PT100 temperature sensor 13 from water corrosion. The PT100 temperature sensor 13 is in close contact with the outer wall of the inner tank and accurately measures the actual water temperature of the inner tank 1. When the water level is lower than the safety threshold (15% of the total height of the inner tank 1), the controller performs the following protection: immediately cuts off the heating power of the outer spiral coil 7 and the inner spiral coil 8; activates the audible and visual alarm and sends a water shortage signal to the user terminal; automatically closes the solenoid valve 15 of the hot water outlet 17 to prevent dry burning (the water outlet 17 is connected to the water supply pipe via a flange or thread, which is not shown in the figure).

[0037] As a technical optimization of this utility model, the inner tank 1 is provided with an inspection port 18 on its side wall. The inspection port 18 has a diameter of Φ150mm and is provided with a double-layer tempered glass observation window 19.

[0038] In this embodiment, the inspection port 18 allows maintenance personnel to easily check the scaling on the coil through the observation window. If necessary, the double-layered tempered glass observation window 19 on the inspection port 18 can be opened to improve the efficiency of manual inspection.

[0039] Working principle and usage process of this utility model:

[0040] Cold water enters from the bottom inlet 16 of the inner tank 1 and flows towards the middle through the baffle 6. During the day when there is sufficient sunlight, the heating medium of the solar collector is pumped into the outer spiral coil 7. The right-hand coil agitates the water flow, forming a high-temperature water layer in conjunction with the upper baffle 6. At night or in cloudy or rainy weather, the air source heat pump starts, and the refrigerant absorbs heat and evaporates in the inner spiral coil 8, absorbing heat from the cold water at the bottom of the inner tank 1. The refrigerant vapor is pressurized by the compressor and enters the condenser to release heat. The gradient insulation layer 2 controls the heat dissipation at night to 0.8℃ / h, and the baffle 6 inhibits the mixing of hot and cold water, maintaining the temperature difference between the upper and lower layers. When water is drawn, high-temperature water from the top is output through outlet 17, and cold water from the bottom is automatically replenished through inlet 16. When the water level is lower than the safety threshold, the controller performs the following protection: immediately cuts off the heating power of the outer spiral coil 7 and the inner spiral coil 8; activates the audible and visual alarm and sends a water shortage signal to the user terminal; automatically closes the solenoid valve 15 of the hot water outlet 17 to prevent dry burning and trigger the protection mechanism; the PT100 sensor monitors the water temperature of each layer in real time, and the data is transmitted to the control terminal via wired / wireless transmission. Maintenance personnel can check the scale buildup on the coils through the observation window and open the inspection port 18 for cleaning if necessary.

[0041] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] However, the above are merely specific embodiments of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A novel solar air energy combined heat storage water tank, comprising a controller, a solar heat collecting device, an air energy heating device, a cylindrical stainless steel inner tank water tank (1); characterized in that: The outer wall of the inner tank (1) is covered with a gradient insulation layer (2), which consists of a high-density polyurethane foam layer (3), an aerogel felt layer (4), and a vacuum insulation board layer (5) from the outside to the inside. A double spiral coil assembly and a flow guide baffle (6) with through holes are coaxially arranged inside the inner tank (1). The double spiral coil assembly includes an outer spiral coil (7) and an inner spiral coil (8). The inlet end of the outer spiral coil (7) is connected to the outlet pipe of the solar collector in the solar collector device, and the outlet end is connected to the return pipe of the solar collector. The outer spiral coil (7) is fixed to the inner wall of the stainless steel inner tank (1) in a right-handed manner, with a pitch of 80-190mm. The inlet end of the inner spiral coil (8) is connected to the refrigerant outlet of the air-source heat pump evaporator in the air-source heating device, and the outlet end is connected to the suction port of the air-source heat pump compressor in the air-source heating device. The inner spiral coil (8) is coaxially nested inside the outer spiral coil (7) in a left-handed manner, with a pitch of 60-90mm. The outer side of the inner spiral coil (8) is wrapped with aluminum silicate fiber cotton (9) to insulate the heat of the outer spiral coil (7).

2. A novel solar air and energy combined heat storage water tank according to claim 1, characterized in that: The outer spiral coil (7) is made of copper-aluminum composite pipe with a wall thickness of 1.2mm and an outer diameter of Φ25mm. Its axial coverage range is 2 / 3 of the total height of the inner tank (1) and the lower end is ≥200mm from the bottom of the inner tank (1). The inner spiral coil (8) is made of copper pipe with a wall thickness of 1.0mm and an outer diameter of Φ20mm. Its axial coverage range is 4 / 5 of the total height of the inner tank (1) and the upper end is ≥150mm from the top of the inner tank (1).

3. A novel solar air and energy combined heat storage water tank according to claim 1, characterized in that: The inclination angle of the flow guide baffle (6) varies in a gradient along the water flow direction. The two flow guide baffles (6) located at the top of the inner tank (1) have an inclination angle of 25°, the two flow guide baffles (6) in the middle have an inclination angle of 35°, and the two flow guide baffles (6) at the bottom have an inclination angle of 30°. The distance between adjacent flow guide baffles (6) decreases from top to bottom.

4. A novel solar air and energy combined heat storage water tank according to claim 1, characterized in that: The inlet and outlet ends of the inner spiral coil (8) are equipped with quick-connect connectors (10), and the quick-connect connectors (10) are embedded with copper-nickel alloy filter screens (11) with a mesh density of 80-100 mesh.

5. A novel solar air and energy combined heat storage water tank according to claim 1 characterized in that: The gradient insulation layer (2) is provided with a temperature sensor mounting tube (12). The temperature sensor mounting tube (12) is made of Φ6mm stainless steel pipe. Its inner end extends to the outer wall surface of the inner tank (1), and its outer end is sealed to a PT100 temperature sensor (13). The lower part of the side wall of the inner tank (1) is provided with a water level sensor (14). The inner tank (1) is provided with an inlet (16) and an outlet (17) of a solenoid valve (15).

6. A novel solar air and energy combined heat storage water tank according to claim 1 characterized in that: The inner tank (1) has an inspection port (18) on its side wall. The inspection port (18) has a diameter of Φ150mm and is equipped with a double-layer tempered glass observation window (19).

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