A solar water heater

Abstract

The present invention discloses a solar water heater. The solar water heater comprises a solar water storage tank, a bracket and a heat collecting device. The solar water storage tank is fixed horizontally on the bracket. The heat collecting device is arranged below the solar water storage tank and connected to the solar water storage tank. The solar water storage tank comprises a box body, a heat preservation layer, an inner tank, a heat exchange coil and a heat exchange coil connecting pipe. The inner tank is arranged inside the box body. The heat preservation layer is arranged between the inner tank and the box body. The heat exchange coil connecting pipe runs through the box body and is fixed in the heat preservation layer. The heat exchange coil is fixed in the inner tank. The heat exchange coil connecting pipe and the heat exchange coil are connected through a circulation pipe. The heat collecting device is connected to the inner tank through a heat collecting hole. The long-standing hot water stored in the water storage tank of the solar water heater of the present invention is only used as a heat medium. The tap water is supplied to the user after instantaneous heat exchange through the heat exchange coil, which ensures that the domestic hot water is completely not in contact with the heat medium water. The hot water is heated immediately after use, and the water quality is fresh and pollution-free.

Description

Technical Field

[0001] The invention relates to the technical field of solar heating equipment, and in particular to a solar water heater. Background Art

[0002] With the progress of human society, people pay more and more attention to environmental quality, so clean energy will inevitably replace petrochemical energy that brings serious environmental pollution. Solar energy is widely known as a clean energy, and technological progress makes large-scale use possible. Solar water heaters are used for solar heat generation, which is environmentally friendly and energy-saving, and can bring social benefits to the country and economic benefits to users. With the maturity of solar thermal conversion technology, solar water heaters have gradually become popular. The solar water storage tank is the core component of the solar water heating system, and its main function is to store heat.

[0003] In the prior art, solar water storage tanks are divided into three categories: open type, closed type and water tank water supply type. The closed water tank mostly uses an enamel liner, which is mainly composed of two raw materials: a porcelain layer and a special enamel steel plate. The water tank water supply type water tank includes a water tank, a water supply device, an ultra-thin plastic film, a black plastic film, a transparent plastic film, a bamboo bracket, a cement support platform, a water outlet pipe, a water outlet faucet and an insulated water storage tank. The water tank type solar water heater is suitable for being arranged on a flat roof or a balcony with a small inclination. The open water tank is a water tank with an open end.

[0004] For example, the invention patent with Chinese patent publication number CN109282508A discloses a solar water heater. The technical problem to be solved by the invention is that the scale inside the water heater affects the heating efficiency of the water heater. In order to solve the above technical problems, the invention provides a solar water heater, including an inclined base, a box support seat is arranged on the right side of the inclined base, a water tank is arranged on the top of the box support seat, a fixed block is arranged on the left side of the top of the inclined base, a vacuum tube is arranged between the fixed block and the water tank, a fixed column is arranged on the top of the inclined base, a movable sleeve is arranged on the outside of the fixed column, and a circular ring sleeve is arranged on the top of the movable sleeve. The solar water heater will process the scale during the water addition process every day, so that the heating speed of the solar water heater will not be reduced; and the adhesion of the scale is low in a short time, which is more convenient in the process of processing the scale; there is no need to control the water temperature to process the scale, and the solar energy is maximized.

[0005] Another example is the utility model patent with Chinese patent publication number CN204678702U, which discloses a water tank type solar water heater, which is composed of a water tank, a water supply device, an ultra-thin plastic film, a black plastic film, a transparent plastic film, a bamboo support, a cement support platform, a water outlet pipe, a water outlet faucet and a heat preservation water storage tank. The water tank type solar water heater is suitable for being arranged on a flat roof or a balcony with a small inclination. Compared with the existing solar water heaters, the utility model has low cost, convenient installation, large water heating capacity, and can be made by ordinary farmers. It is suitable for factories or farmers with large hot water consumption.

[0006] There are at least the following problems in the prior art:

[0007] 1. The initial investment of closed water tanks is high, the system pressure is high, and the operation and maintenance costs are high. The selection of enameled steel plates is very picky, and the expansion coefficient must match the expansion coefficient of enamel. If the difference between the two coefficients is too large, cracks will appear on the enamel surface during the alternating hot and cold process, resulting in deglazing.

[0008] 2. The water quality of open water tanks cannot be guaranteed, and there is secondary pollution: The closed water tanks in the existing technology have high initial investment, high system pressure, and high operating and maintenance costs; the selection of enameled steel plates is very picky, and the expansion coefficient must match the expansion coefficient of enamel. If the difference between the two coefficients is too large, cracks will appear on the enamel surface during the alternating hot and cold process, and deglazing will occur; the water quality of open water tanks cannot be guaranteed, and there is a problem of secondary pollution. No effective solution has been proposed yet. Summary of the invention

[0009] The purpose of the present invention is to provide a solar water heater in view of the deficiencies in the prior art.

[0010] The solar water heater comprises a solar water storage tank, a bracket and a heat collecting device. The solar water storage tank is horizontally fixed on the bracket, and the heat collecting device is arranged below the solar water storage tank and connected to the solar water storage tank; the solar water storage tank comprises a tank body, a thermal insulation layer, an inner tank, a heat exchange coil and a heat exchange coil connecting pipe. The inner tank is arranged inside the tank body, the thermal insulation layer is arranged between the inner tank and the tank body, the heat exchange coil connecting pipe penetrates the tank body and is fixed in the thermal insulation layer, the heat exchange coil is fixed in the inner tank, the heat exchange coil connecting pipe and the heat exchange coil are connected through a circulation pipe, and the heat collecting device is connected to the inner tank through a heat collecting hole.

[0011] Furthermore, ports on both sides of the heat exchange coil are fixed to both sides of the inner tank through pipe joints, and the heat exchange coil is connected to the circulation pipe through the pipe joints.

[0012] Further, the pipe joint includes a sealing ring, a baffle, an elastic retaining ring for the shaft, a sealing washer, a sealing gasket, a sealing nut, an O-ring and a pipe fitting;

[0013] The two ends of the pipe fitting are respectively connected to the circulation pipe and the heat exchange coil. The sealing ring is clamped on the pipe fitting at the connection position of the insulation layer and the inner tank. The baffle, shaft elastic retaining ring, sealing gasket, sealing gasket, O-ring and sealing nut are clamped on the pipe fitting in sequence, and the sealing ring is in contact with the baffle.

[0014] Furthermore, the heat exchange coil connecting pipe includes a straight pipe, a first external thread joint, a second external thread joint and a tee joint, one end of the straight pipe is connected to the first external thread joint, the other end of the straight pipe is connected to the second external thread joint through the tee joint, and the tee joint is connected to the circulation pipe.

[0015] Furthermore, the solar water storage tank also includes an exhaust pipe, and an exhaust sealing ring is provided between the exhaust pipe and the inner tank.

[0016] Furthermore, the solar water storage tank also includes a sewage outlet, and a sewage sealing ring is arranged between the sewage outlet and the inner tank.

[0017] Furthermore, the thermal insulation layer is made of polyurethane material.

[0018] Furthermore, the solar water storage tank also includes a water storage tank connecting pipe.

[0019] Furthermore, a barrel support is provided between the solar water storage tank and the bracket.

[0020] Furthermore, the connection surface between the barrel support and the solar water storage tank is a concave surface.

[0021] Compared with the prior art, the solar water heater of the present invention has the following remarkable advantages:

[0022] 1. The solar water heater of the present invention collects heat in natural circulation and uses tap water pressure to exchange heat. It does not need to add additional heat collection circulation pumps and variable frequency booster pumps, and the circulation power consumption is low.

[0023] 2. The non-industrial standard parts of the solar water heater described in the present invention, such as the heat exchange coil, circulation pipe, pipe joints, etc., are integrated and standardized, and the heat loss of the pipe network is low, which reduces the cost and saves investment.

[0024] 3. The long-standing hot water stored in the heat storage tank of the solar water heater described in the present invention is only used as a heat medium, and the tap water is supplied to the user after instantaneous heat exchange through the heat exchange coil, ensuring that the domestic hot water has no contact with the heat medium water, the hot water is heated immediately when used, and the water quality is fresh and pollution-free.

[0025] 4. The solar water heater described in the present invention integrates heat storage and heat exchange and has high efficiency.

[0026] 5. The solar water heater heat exchange coil connecting pipe of the present invention is built in the insulation layer, is not easy to freeze, and can be used in extremely cold areas.

[0027] 6. The solar water storage tank of the present invention does not need to be installed with heating tape for thawing, thus saving operation costs and subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a partial cross-sectional schematic diagram of the solar water heater of the present invention;

[0029] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0030] Figure 3 for Figure 1 Schematic diagram of the structure in the middle M direction;

[0031] Figure 4 It is a partial cross-sectional schematic diagram of another embodiment of the solar water heater of the present invention;

[0032] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0033] Figure 6 for Figure 4 Schematic diagram of the structure in the N direction;

[0034] Figure 7 It is a schematic diagram of the structure of the heat exchange coil connecting pipe of the solar water heater of the present invention.

[0035] Description of reference numerals:

[0036] 1-solar water storage tank, 11-tank, 12-insulation layer, 13-liner, 14-heat exchange coil, 15-heat exchange coil connecting pipe, 151-straight pipe, 152-first external thread joint, 153-second external thread joint, 154-tee joint, 16-heat collecting hole, 17-exhaust pipe, 18-exhaust sealing ring, 19-drain outlet, 20-drain sealing ring, 21-water storage tank connecting pipe; 2-bracket; 3-vacuum collector tube; 4-solar heat absorbing plate; 5-heat absorbing connecting pipe; 6-circulation pipe; 7-pipe joint, 71-sealing ring, 72-blocking piece, 73-elastic retaining ring for shaft, 74-sealing gasket, 75-sealing gasket, 76-sealing nut, 77-O-type sealing ring, 78-pipe fitting; 8-barrel support; 9-tail support assembly, 91-tail support, 92-tail, 93-pipe support. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] Example 1

[0039] like Figures 1 to 3As shown, the solar water heater includes a solar water storage tank 1, a bracket 2 and a vacuum heat collecting tube 3. The solar water storage tank 1 is a cylindrical structure. The solar water storage tank 1 is horizontally fixed on the bracket 2. The bracket 2 is made of stainless steel or aluminum alloy. A plurality of heat collecting holes 16 are opened at the lower end of the solar water storage tank 1. The plurality of heat collecting holes 16 are evenly distributed on the solar water storage tank 1. The size of the heat collecting holes 16 matches the size of the vacuum heat collecting tube 3. The plurality of vacuum heat collecting tubes 3 are arranged below the solar water storage tank 1. The solar water storage tank 1 is connected to the solar water storage tank 1. Specifically, the upper end of the vacuum heat collecting tube 3 passes through the heat collecting hole 16 and extends into the interior of the solar water storage tank 1. The vacuum heat collecting tube 3 is connected to the interior of the solar water storage tank 1. The solar water storage tank 1 includes a box body 11, an insulation layer 12, an inner tank 13, a heat exchange coil 14 and a heat exchange coil connecting pipe 15. The box body 11 is located at the outermost layer and is used to protect the internal structure. The box body 11 is made of metal, and the metal includes a color steel plate, a galvanized aluminum plate or a stainless steel plate. The box body 11 is a cylindrical structure. The thermal layer 12 is arranged inside the box 11 to prevent heat loss. The thermal insulation layer 12 is made of polyurethane material. The thickness of the thermal insulation layer 12 is greater than the thickness of the box 11 to improve the thermal insulation effect. The inner tank 13 is arranged inside the thermal insulation layer 12 to contain the working medium, wherein the working medium is water. The inner tank 13 is made of stainless steel or enamel. The inner tank 13 is cylindrical. The heat exchange coil 14 is a spring type and is arranged inside the inner tank 13 to increase the length and increase the heating time of the heat exchange water inside the heat exchange coil 14. In order to improve the heating effect, there are two heat exchange coil connecting pipes 15, which are respectively fixed at the upper and lower ends of the insulation layer 12, and the heat exchange coil connecting pipes 15 penetrate the insulation layer 12. The two heat exchange coil connecting pipes 15 are respectively connected to the two ends of the heat exchange coil 14 through a circulation pipe 6. Tap water enters the heat exchange coil 14 through the circulation pipe 6 from the heat exchange coil connecting pipe 15 and the working medium in the inner tank 13 for heat exchange. The tap water after heat exchange is output through the circulation pipe 6 at the other end of the heat exchange coil 14 and the heat exchange coil connecting pipe 15.

[0040] Furthermore, if Figure 1 and Figure 2 As shown, the ports on both sides of the heat exchange coil 14 are fixed to the two sides of the inner tank 13 through the pipe joints 7 respectively, and the heat exchange coil 14 is connected to the circulation pipe 6 through the pipe joints 7. Specifically, the pipe joints 7 are arranged at the connection position between the insulation layer 12 and the inner tank 13, and one end of the pipe joints 7 is exposed to the inner wall of the inner tank 13 for connecting to the heat exchange coil 14, and the other end of the pipe joints 7 is located in the insulation layer 12, and the other end of the pipe joints 7 is connected to the circulation pipe 6 for reducing heat loss.

[0041] Furthermore, if Figure 2As shown, the pipe joint 7 includes a sealing ring 71, a baffle 72, an elastic retaining ring 73 for the shaft, a sealing gasket 74, a sealing gasket 75, a sealing nut 76, an O-ring 77 and a pipe fitting 78; both ends of the pipe fitting 78 are respectively connected to the circulation pipe 6 and the heat exchange coil 14, the sealing ring 71 is fixed on the pipe fitting 78 at the connection position of the insulation layer 12 and the inner tank 13, the baffle 72, the elastic retaining ring 73 for the shaft, the sealing gasket 74, the sealing gasket 75, the O-ring 77 and the sealing nut 76 are fixed on the pipe fitting 78 in sequence, and the sealing ring 71 is in contact with the baffle 72, which can improve the sealing performance while preventing the circulation pipe 6 from falling off.

[0042] Furthermore, if Figure 7 As shown, the heat exchange coil connecting pipe 15 includes a straight pipe 151, a first external thread joint 152, a second external thread joint 153 and a three-way joint 154. One end of the straight pipe 151 is connected to the first external thread joint 152, and the other end of the straight pipe 151 is connected to the second external thread joint 153 through the three-way joint 154. The three-way joint 154 is connected to the circulation pipe 6 for conveying tap water. It should be noted that multiple solar water storage tanks 1 in the same row can be connected through the first external thread joint 152 and the second external thread joint 153, so as to facilitate the conveying of more water for heat exchange.

[0043] Furthermore, if Figure 1 As shown, the solar water storage tank 1 further includes an exhaust pipe 17 , an exhaust sealing ring 18 is provided between the exhaust pipe 17 and the inner tank 13 , and the exhaust pipe 17 can adjust the pressure in the inner tank 13 .

[0044] Furthermore, if Figure 1 As shown, the solar water storage tank 1 further includes a sewage outlet 19 , a sewage sealing ring 20 is provided between the sewage outlet 19 and the inner tank 13 , and the sewage outlet 19 is used to discharge impurities in the inner tank 13 .

[0045] Furthermore, if Figure 1 As shown, the solar water storage tank 1 further includes a water storage tank connecting pipe 21, through which a plurality of solar water storage tanks 1 can be connected together to store more heat energy.

[0046] Furthermore, if Figure 1 , Figure 3 As shown, a barrel holder 8 is provided between the solar water storage tank 1 and the bracket 2 , and the connection surface between the barrel holder 8 and the solar water storage tank 1 is a concave surface for matching with the arc surface of the solar water storage tank 1 .

[0047] Furthermore, if Figure 3As shown, the bracket 2 and the vacuum heat collecting tube 3 are connected and fixed by a tailstock support assembly 9. The tailstock support assembly 9 includes a tailstock support 91, a tailstock 92, and a pipe support 93. The left side of the tailstock support 91 is connected and fixed to the lower end of the bracket 2, and the right side of the tailstock support 91 is connected and fixed to the pipe support 93 through the tailstock 92. The lower end of the vacuum heat collecting tube 3 is arranged in the pipe support 93.

[0048] Furthermore, the vacuum heat collecting tube 3 includes an outer tube (not shown in the figure) and an inner tube (not shown in the figure), a vacuum layer is formed between the outer tube and the inner tube, a heat absorbing coating is provided on the outer surface of the inner tube, and a working medium is provided in the inner tube, wherein the heat absorbing coating is prepared from the following components in parts by weight: 45 parts of polyester modified silicone resin, 6 parts of triethanolamine, 10 parts of titanium dioxide, 3 parts of 2-bromo-2-(2-fluorophenyl)-1-cyclopropylethanone, 40 parts of butyl acetate, 15 parts of molybdenum silicide, 10 parts of graphene, and 3 parts of silicon dioxide.

[0049] The working principle of the solar water heater described in the present invention is:

[0050] The vacuum heat collecting tube 3 is connected to the inner tank 13. When sunlight shines on the outer surface of the inner tube, it is absorbed by the absorption coating thereon and converted into energy storage, which is then transferred to the working medium in the vacuum tube through the inner tube wall. Since the density of the working medium with a high temperature is less than that of the medium with a low temperature, the working medium with a higher temperature moves upward into the inner tank 13, while the working medium with a lower temperature enters the vacuum heat collecting tube 3 and is heated. Tap water flows in from one end of the heat exchange coil connecting tube 15, enters the heat exchange coil 14 from one end through the circulation tube 6, and exchanges heat in the inner tank 13. After heat exchange, The hot water enters the water outlet of the heat exchange coil connecting pipe 15 at the other end through the circulation pipe 6 at the other end of the heat exchange coil 14, ensuring the freshness of the water quality. The working medium is stored in the inner tank 13 of the vacuum collector tube 3 and the solar water storage tank 1, and circulates in a natural convection manner without the need for external power. The heat exchange water flows in the heat exchange coil 14 and the heat exchange coil connecting pipe 15 and is heated by the circulating working medium. Therefore, the heat exchange water is driven by the natural water pressure of the tap water and flows in the heat exchange coil 14, without the need to consume other energy conversion power drive.

[0051] Example 2

[0052] like Figures 4 to 6As shown, the solar water heater comprises: the solar water heater comprises a solar water storage tank 1, a bracket 2, a solar heat absorbing plate 4 and a heat absorbing connecting pipe 5, the solar water storage tank 1 is a cylindrical structure, the solar water storage tank 1 is horizontally fixed on the bracket 2, the bracket 2 is made of stainless steel or aluminum alloy, the solar heat absorbing plate 4 is rectangular, the solar heat absorbing plate 4 is connected to the bracket 2, the lower end of the solar water storage tank 1 is provided with two heat collecting holes 16, the size of the heat collecting holes 16 matches the size of the heat absorbing connecting pipe 5, the solar heat absorbing plate 4 is arranged on the solar water storage tank 1, and the solar water storage tank 1 is provided with a solar heat collecting hole 16. The size of the solar heat collecting hole 16 matches the size of the heat absorbing connecting pipe 5. The solar heat absorbing plate 4 is arranged on the solar water storage tank 1. The solar water storage tank 1 is connected to the solar water storage tank 1 through the heat absorption connecting pipe 5. Specifically, the upper end of the solar heat absorption plate 4 is connected to the heat absorption connecting pipe 5. The heat absorption connecting pipe 5 extends into the solar water storage tank 1 through the heat collection hole 16, and the heat absorption connecting pipe 5 is connected to the inside of the solar water storage tank 1. The solar water storage tank 1 includes a box body 11, an insulation layer 12, an inner tank 13, a heat exchange coil 14 and a heat exchange coil connecting pipe 15. The box body 11 is located at the outermost layer to protect the internal structure. The box body 11 is made of metal, and the metal includes color steel plate, plated steel plate, Aluminum zinc plate or stainless steel plate, the box body 11 is a cylindrical structure, the insulation layer 12 is arranged inside the box body 11 to prevent heat loss, the insulation layer 12 is made of polyurethane material, the thickness of the insulation layer 12 is greater than the thickness of the box body 11, and is used to improve the insulation effect, the liner 13 is arranged inside the insulation layer 12, and is used to contain the working medium, wherein the working medium is water, the liner 13 is made of stainless steel or enamel, the liner 13 is cylindrical, the heat exchange coil 14 is a spring type, arranged inside the liner 13, and is used to increase the length and improve the heat exchange coil 14. In order to reduce the heating time of the heat exchange water, the heating effect is improved. There are two heat exchange coil connecting pipes 15, which are respectively fixed at the upper and lower ends of the insulation layer 12, and the heat exchange coil connecting pipes 15 penetrate the insulation layer 12. The two heat exchange coil connecting pipes 15 are respectively connected to the two ends of the heat exchange coil 14 through a circulation pipe 6. The tap water enters the heat exchange coil 14 and the working medium in the inner tank 13 through the circulation pipe 6 from the heat exchange coil connecting pipe 15 to exchange heat with the working medium in the inner tank 13. The tap water after heat exchange is output through the circulation pipe 6 at the other end of the heat exchange coil 14 and the heat exchange coil connecting pipe 15.

[0053] Furthermore, if Figure 4 and Figure 5 As shown, the ports on both sides of the heat exchange coil 14 are fixed to the two sides of the inner tank 13 through the pipe joints 7 respectively, and the heat exchange coil 14 is connected to the circulation pipe 6 through the pipe joints 7. Specifically, the pipe joints 7 are arranged at the connection position between the insulation layer 12 and the inner tank 13, and one end of the pipe joints 7 is exposed to the inner wall of the inner tank 13 for connecting to the heat exchange coil 14, and the other end of the pipe joints 7 is located in the insulation layer 12, and the other end of the pipe joints 7 is connected to the circulation pipe 6 for reducing heat loss.

[0054] Furthermore, if Figure 5As shown, the pipe joint 7 includes a sealing ring 71, a baffle 72, an elastic retaining ring 73 for the shaft, a sealing gasket 74, a sealing gasket 75, a sealing nut 76, an O-ring 77 and a pipe fitting 78; both ends of the pipe fitting 78 are respectively connected to the circulation pipe 6 and the heat exchange coil 14, the sealing ring 71 is fixed on the pipe fitting 78 at the connection position of the insulation layer 12 and the inner tank 13, the baffle 72, the elastic retaining ring 73 for the shaft, the sealing gasket 74, the sealing gasket 75, the O-ring 77 and the sealing nut 76 are fixed on the pipe fitting 78 in sequence, and the sealing ring 71 is in contact with the baffle 72, which can improve the sealing performance while preventing the circulation pipe 6 from falling off.

[0055] Furthermore, if Figure 7 As shown, the heat exchange coil connecting pipe 15 includes a straight pipe 151, a first external thread joint 152, a second external thread joint 153 and a three-way joint 154. One end of the straight pipe 151 is connected to the first external thread joint 152, and the other end of the straight pipe 151 is connected to the second external thread joint 153 through the three-way joint 154. The three-way joint 154 is connected to the circulation pipe 6 for conveying tap water. It should be noted that multiple solar water storage tanks 1 in the same row can be connected through the first external thread joint 152 and the second external thread joint 153, so as to facilitate the conveying of more water for heat exchange.

[0056] Furthermore, if Figure 4 As shown, the solar water storage tank 1 further includes an exhaust pipe 17 , an exhaust sealing ring 18 is provided between the exhaust pipe 17 and the inner tank 13 , and the exhaust pipe 17 can adjust the pressure in the inner tank 13 .

[0057] Furthermore, if Figure 4 As shown, the solar water storage tank 1 further includes a sewage outlet 19 , a sewage sealing ring 20 is provided between the sewage outlet 19 and the inner tank 13 , and the sewage outlet 19 is used to discharge impurities in the inner tank 13 .

[0058] Furthermore, if Figure 4 As shown, the solar water storage tank 1 further includes a water storage tank connecting pipe 21, through which a plurality of solar water storage tanks 1 can be connected together to store more heat energy.

[0059] Furthermore, if Figure 4 As shown, a barrel holder 8 is provided between the solar water storage tank 1 and the bracket 2 , and the connection surface between the barrel holder 8 and the solar water storage tank 1 is a concave surface for matching with the arc surface of the solar water storage tank 1 .

[0060] The working principle of the solar water heater described in the present invention is:

[0061] Sunlight penetrates the glass cover of the solar heat absorbing plate 4, irradiates the solar heat absorbing plate 4 and is converted into heat energy, and transfers the heat energy to the working medium in the solar heat absorbing plate 4 to heat it up. Since the high-temperature working medium has a low density, the high-temperature working medium moves upward and transfers heat to the inner tank 13 through the heat absorption connecting pipe 5. After the heat exchange, the temperature of the working medium decreases and the density increases. Under the action of gravity, it returns to the solar heat absorbing plate 4. This cycle eventually raises the working medium in the inner tank 13 to the use temperature. The tap water passes through the heat exchange coil connecting pipe 15, the circulation pipe 6, and enters the heat exchange coil 14, and is instantly heated, so that the water temperature quickly reaches the required Temperature, and enters the outlet of the heat exchange coil connecting pipe 15 at the other end through the circulation pipe 6 at the other end of the heat exchange coil 14, thereby ensuring the freshness of the water quality. The working medium is stored in the solar heat absorbing plate 4 and the inner tank 13, and circulates in a natural convection manner without the need for external power. The heat exchange water flows in the heat exchange coil 14 and the circulation pipe 6 and is heated by the circulating working medium. The water inlet of the heat exchange coil connecting pipe 15 is connected to the tap water pipeline, and the water outlet of the heat exchange coil connecting pipe 15 is connected to the water use end. The heat exchange water is driven by the natural water pressure of the tap water and flows in the heat exchange coil 14 without the need to consume other energy conversion power drive.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A solar water heater, characterized in that: include: A solar water storage tank (1), a bracket (2), and a heat collecting device, wherein the solar water storage tank (1) is horizontally fixed on the bracket (2), and the heat collecting device is arranged below the solar water storage tank (1) and connected to the solar water storage tank (1); The solar water storage tank (1) comprises a tank body (11), a heat-insulating layer (12), an inner tank (13), a heat-exchanging coil (14), and a heat-exchanging coil connecting pipe (15); the inner tank (13) is arranged inside the tank body (11); the heat-insulating layer (12) is arranged between the inner tank (13) and the tank body (11); the heat-exchanging coil connecting pipe (15) passes through the tank body (11) and is fixedly arranged in the heat-insulating layer (12); the heat-exchanging coil (14) is fixedly arranged in the inner tank (13); the heat-exchanging coil connecting pipe (15) is connected to the heat-exchanging coil connecting pipe (15); The heat exchange tube (15) and the heat exchange coil (14) are connected via a circulation tube (6); the heat collection device is connected to the inner tank (13) via a heat collection hole (16); ports on both sides of the heat exchange coil (14) are fixed to both sides of the inner tank (13) via pipe joints (7), respectively; the heat exchange coil (14) is connected to the circulation tube (6) via the pipe joint (7); the pipe joint (7) comprises a sealing ring (71), a baffle (72), an elastic retaining ring (73) for the shaft, a sealing gasket (74), a sealing gasket (75), a sealing A sealing nut (76), an O-ring (77) and a pipe fitting (78), wherein the two ends of the pipe fitting (78) are respectively connected to the circulation pipe (6) and the heat exchange coil (14), the sealing ring (71) is fixed to the pipe fitting (78) at the connection position between the thermal insulation layer (12) and the inner tank (13), and the baffle (72), the shaft elastic retaining spring (73), the sealing gasket (74), the sealing gasket (75), the O-ring (77) and the sealing nut (76) are fixed to the pipe fitting (78) in sequence. The heat exchange coil connecting pipe (15) comprises a straight pipe (151), a first external thread joint (152), a second external thread joint (153) and a three-way joint (154); one end of the straight pipe (151) is connected to the first external thread joint (152); the other end of the straight pipe (151) is connected to the second external thread joint (153) via the three-way joint (154); and the three-way joint (154) is connected to the circulation pipe (6).

2. The solar water heater according to claim 1, characterized in that: The solar water storage tank (1) further comprises an exhaust pipe (17), and an exhaust sealing ring (18) is provided between the exhaust pipe (17) and the inner tank (13).

3. The solar water heater according to claim 1, characterized in that: The solar water storage tank (1) further comprises a sewage outlet (19), and a sewage outlet sealing ring (20) is provided between the sewage outlet (19) and the inner tank (13).

4. The solar water heater according to claim 1, characterized in that: The thermal insulation layer (12) is made of polyurethane material.

5. The solar water heater according to claim 1, characterized in that: The solar hot water storage tank (1) further comprises a hot water storage tank connecting pipe (21).

6. The solar water heater according to claim 1, characterized in that: A barrel support (8) is provided between the solar water storage tank (1) and the bracket (2).

7. The solar water heater according to claim 6, characterized in that: The connection surface between the barrel support (8) and the solar water storage tank (1) is a concave surface.

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