A solar water heater capable of automatic cleaning and antifreezing

Abstract

The present invention relates to the technical field of solar energy equipment, and in particular to a solar water heater capable of automatic cleaning and antifreezing, comprising a water storage tank, a heat collecting tube, a cleaning mechanism and an antifreezing assembly. The cleaning mechanism comprises: an internal circulation pipeline, comprising an upper water pipe and a lower water pipe, a return water pipe is arranged between the upper water pipe and the lower water pipe, and a cleaning agent delivery port and a water pump are arranged on the return water pipe. A water storage tank cleaning assembly is arranged at the bottom of the water storage tank and connected to the internal circulation pipeline. A heat collecting tube cleaning assembly, one end of which is arranged inside the water storage tank and connected to the internal circulation pipeline, and the other end is arranged inside the heat collecting tube. The solar water heater can automatically clean the scale inside the water tank and the heat collecting tube, avoiding the trouble of disassembly and cleaning. In addition, by means of the internal circulation pipeline and the antifreezing assembly, the upper and lower water pipes and the heat collecting tube can be antifreezed in cold weather, avoiding the inconvenience of water use and economic losses caused by low temperature.

Description

Technical Field

[0001] The invention relates to the technical field of solar energy equipment, and in particular to a solar water heater capable of automatic cleaning and antifreezing. Background Art

[0002] Solar water heaters convert sunlight into heat energy, heating water from low temperature to high temperature to meet people's hot water needs in life and production. As the water in the solar water heater is continuously heated, the concentration of calcium and magnesium salts in the water increases. When their concentrations exceed, they precipitate from the water to form sediments. Secondly, bicarbonates decompose under heat to form insoluble sediments. In addition, as the temperature rises, the solubility of certain salts gradually decreases, and they precipitate. Finally, impurities in tap water and dirt formed after the death of microorganisms produced by long-term use of the water heater. The above sediments, impurities, and dirt adhere to the water tank and the wall of the collector tube to form scale.

[0003] At present, the method of cleaning the scale of the water tank and the heat collecting tube is that the personnel have to climb up to the roof and dismantle the water tank and the heat collecting tube on site to completely remove the scale, which is time-consuming and labor-intensive, and the safety of the operators cannot be guaranteed. In addition, in winter, the upper and lower water pipes often freeze, which brings inconvenience to water use. In extreme weather or infrequent use, ice may form at the bottom of the heat collecting tube, freezing the heat collecting tube. There is an urgent need for a solar water heater that can automatically clean the scale inside the water tank and the heat collecting tube and can effectively solve the problem of winter antifreeze. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, an embodiment of the present invention provides a solar water heater that can automatically clean and prevent freezing.

[0005] The technical solution of the embodiment of the present invention is:

[0006] The embodiment of the present invention provides a solar water heater capable of automatic cleaning and antifreezing, comprising a water storage tank, a heat collecting tube and a cleaning mechanism.

[0007] The cleaning mechanism comprises:

[0008] The internal circulation pipeline comprises an upper water pipe and a lower water pipe, a return water pipe is arranged between the upper water pipe and the lower water pipe, and a cleaning agent delivery port and a water pump are arranged on the return water pipe.

[0009] The water tank cleaning component is arranged at the bottom of the water tank and connected to the internal circulation pipeline.

[0010] A heat collecting tube cleaning component has one end disposed inside the water storage tank and connected to the internal circulation pipeline, and the other end disposed inside the heat collecting tube.

[0011] Further, the water tank cleaning assembly comprises:

[0012] A support plate is fixedly connected to the water tank, and a double water outlet knot is fixed on the support plate.

[0013] The top of the double water outlet junction is flush with or slightly lower than the inner wall of the water storage tank, and the lower part is connected to the upper water pipe.

[0014] The rubber membrane is arranged in a funnel-type structure and is fixed in the double water-through-port junction. A pressing sheet for fixing the rubber membrane is arranged on the upper part of the rubber membrane.

[0015] The pressing sheet is arranged in the double water outlet node, and the structure is arranged as a circular ring sheet with a through hole in the middle.

[0016] The bracket has a top connected to the elbow and a bottom connected to the support plate.

[0017] The curved pipe is arranged inside the water tank, and the curved pipe is arranged to have a structure in which the bottom diameter is larger than the top diameter, and there is a height difference between the top of the curved pipe and the top of the double water outlet junction; the height difference between the bottom of the curved pipe and the top of the double water outlet junction is less than the height of the rubber membrane.

[0018] A sewer pipe connecting device is arranged inside the water storage tank and connected to the sewer pipe. The sewer pipe connecting device is arranged as a three-way pipeline in an L-shape as a whole, including a first port on the top, a second port on the bottom and a third port on the side. A first one-way valve is arranged on one side of the third port of the sewer pipe connecting device. A column is arranged on the pipe wall on one side of the third port. A first floating plug that can move with water is connected to the column. When there is no water, the first floating plug is located at the third port to play a blocking role.

[0019] Furthermore, the angle between the curved pipe and the inner wall of the longer side of the water tank is set to be 30 to 60 degrees, and the water sprayed out can effectively generate vortex flow within the angle range.

[0020] Furthermore, the bent pipe is configured as a retractable multi-section bent pipe, and two ends of the bent pipe are connected with a spring sheet, which plays the role of opening the multi-section bent pipe and orienting the multi-section bent pipe.

[0021] Furthermore, the curved pipe is configured to have a structure in which the bottom diameter is larger than the top diameter, and the middle diameter is larger than the bottom diameter.

[0022] Furthermore, the water tank includes the inner wall of the water tank, an insulation layer and an outer wall of the water tank, and an exhaust port is arranged above the water tank; a heater installation port, a magnesium rod installation port, a water temperature sensor installation port, and a water level sensor installation port are arranged on the side of the water tank; the bottom of the inner wall of the water tank protrudes downward, and an opening is arranged at the protrusion, and the water tank cleaning assembly is connected to the water tank through the opening.

[0023] Furthermore, the heat collecting tube cleaning assembly comprises:

[0024] A conversion joint is arranged inside the water storage tank, one end of the conversion joint is connected to the downpipe connecting device, and the other end of the conversion joint is connected to the first guide pipe.

[0025] The first flow guide pipe is arranged inside the water storage tank, one end of the first flow guide pipe is connected to the conversion joint, and the other end of the first flow guide pipe is connected to the second flow guide pipe.

[0026] The second flow guide pipe includes a main pipe and a plurality of branch pipe joints; the main pipe is arranged on the inner wall of the water storage tank, and the branch pipe joints are connected to the third flow guide pipe and inserted into the heat collecting pipe.

[0027] The third flow guide tube is arranged inside the heat collecting tube, the bottom end of the third flow guide tube is shaped like a hook, the opening of the hook is arranged like a bell mouth, a second floating plug which can move with the water is arranged above the bell mouth, and when there is no water, the second floating plug is just located at the bell mouth to play a blocking role.

[0028] A support pad is arranged outside the third flow guide pipe, and the support pad is used to support the third flow guide pipe in the heat collecting pipe.

[0029] Furthermore, it also includes an antifreeze component, which includes a second flow guide pipe, a third flow guide pipe, a water pump and an electromagnetic valve arranged at one end of the second flow guide pipe, and a heat collecting pipe temperature sensor arranged at the bottom of the third flow guide pipe.

[0030] Furthermore, a sewage settling box is provided at the bottom of the inner circulation pipeline. The sewage settling box is configured as a transparent box body, the top opening is connected to the water supply pipe, a cleaning port is provided in the middle for cleaning the sewage settling box, and a sewage drain valve is provided at the bottom.

[0031] Furthermore, it also includes a controller, which is electrically connected to the water pump, the heater, the water temperature sensor, the water level sensor, the drain valve and the automatic water supply valve.

[0032] The beneficial effects achieved by the embodiments of the present invention are:

[0033] 1. The embodiment of the present invention adopts a technical solution of setting a cleaning mechanism in the solar water heater. Without disassembling the water heater, it can automatically clean the scale in the water tank and the scale inside the collector tube, avoiding the trouble of disassembly and cleaning, facilitating operation, reducing labor input costs, greatly extending the service life, and being more conducive to healthy water use.

[0034] 2. The embodiment of the present invention adopts an internal circulation pipeline set in the solar water heater system, and a water tank cleaning device and a heater are set in the water tank. The water pump provides power to keep the pipeline full of hot water at all times or as needed. The hot water is circulated intermittently every day to make the water in the barrel flow in a vortex, which can effectively reduce the generation of scale. At the same time, since the upper and lower water pipes are laid in parallel and adjacent to each other, they can also have an anti-freeze effect.

[0035] 3. The embodiment of the present invention uses a controller to control the heater to heat up, which can make the water temperature of the inner circulation hotter during the automatic cleaning process, thereby enhancing the cleaning effect. Under the action of the water tank cleaning device, the water flow continuously and directionally flushes the inner wall of the water tank, thereby improving the cleaning effect. At the same time, by adding a temperature sensor to the mixing valve, the controller can be used to heat water as soon as it is needed, without waiting for the cold water to be drained before hot water appears, thus saving water.

[0036] 4. The second and third flow guide pipes of the heat collecting pipe cleaning assembly of the embodiment of the present invention are made of copper. Since copper has good thermal conductivity, it can play a preliminary antifreeze effect on the heat collecting pipe. Under extreme conditions, by setting the technical solution of the antifreeze assembly, the water pump can send the hot water in the bucket to the heat collecting pipe terminal, which can prevent the heat collecting pipe from freezing and freezing.

[0037] 5. The embodiment of the present invention can directly and completely drain the water in the water storage tank and the heat collecting tube by providing an internal circulation pipeline and a controller. This draining method can effectively protect the entire solar water heater system from freezing when it is not used for a long time or in extreme climates. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of a solar water heater according to an embodiment of the present invention.

[0039] Figure 2 It is a schematic diagram of the structure of a water storage tank according to an embodiment of the present invention.

[0040] Figure 3 It is a schematic structural diagram of a water tank cleaning assembly according to an embodiment of the present invention.

[0041] Figure 4 It is a schematic structural diagram of a water tank cleaning assembly according to another embodiment of the present invention.

[0042] Figure 5It is a schematic structural diagram of a sewer pipe connecting device according to an embodiment of the present invention.

[0043] Figure 6 It is a schematic diagram of the decomposition of a heat collector tube cleaning assembly according to an embodiment of the present invention.

[0044] Figure 7 It is a schematic diagram of the assembly of the first flow guide pipe, the second flow guide pipe, and the third flow guide pipe according to an embodiment of the present invention.

[0045] Figure 8 It is a schematic diagram of the structure of the third flow guide tube according to an embodiment of the present invention.

[0046] Fig. 9 It is a schematic diagram of assembling the first guide pipe, the second guide pipe and the third guide pipe of the antifreeze system added to an embodiment of the present invention.

[0047] In the figure, 1. Internal circulation pipeline: 101. Water supply pipe; 102. Water supply pipe; 103. Water return pipe; 104. Water pump; 105. Water supply valve; 106. Sewage box; 107. Drain valve; 108. Second one-way valve; 109. Cleaning agent delivery port; 110. Mixing valve; 111. First manual valve; 112. Second manual valve; 2. Water storage tank; 201. Inner wall of water storage tank; 202. Water storage tank shell; 203. Water storage tank insulation layer; 204. Temperature sensor installation port; 205. Water level sensor installation port; 206. Heater installation port; 3. Water storage tank cleaning component; 301. Double water outlet junction; 302. Rubber membrane ; 303, pressing sheet; 304, supporting plate; 305, elbow; 306, bracket; 307, sewer pipe connecting device; 3071, first port; 3072, second port; 3073, third port; 308, first floating plug; 309, first one-way valve; 310, column; 311, sealing ring; 312, spring; 4, collector tube cleaning device; 401, conversion joint; 402, first guide tube; 403, second guide tube; 404, third guide tube; 405, bracket pad; 406, second floating plug; 5, controller; 6, collector tube; 8, water pump; 9, solenoid valve; 10, collector tube temperature sensor. DETAILED DESCRIPTION

[0048] To facilitate those skilled in the art to understand the present invention, specific implementations of the present invention are described below with reference to the accompanying drawings.

[0049] It should be noted that the double water outlet junction 301 in the embodiment of the present invention refers to a double water outlet structure.

[0050] like Figures 1 to 5 As shown, an embodiment of the present invention provides a solar water heater capable of automatic cleaning and antifreezing, comprising a water storage tank 2, a heat collecting tube 6 and a cleaning mechanism.

[0051] like Figure 1 As shown, the cleaning mechanism comprises:

[0052] The internal circulation pipeline 1 includes an upper water pipe 101 and a lower water pipe 102. A return water pipe 103 is arranged between the upper water pipe 101 and the lower water pipe 102. The return water pipe 103 is provided with a cleaning agent injection port 109 and a water pump 104. The upper water pipe 101 and the lower water pipe 102 are laid in parallel and adjacent to each other.

[0053] A water tank cleaning assembly 3 is arranged at the bottom of the water tank 2 and connected to the internal circulation pipeline 1;

[0054] The heat collecting tube 6 cleaning component has one end disposed inside the water storage tank 2 and connected to the internal circulation pipeline 1 , and the other end disposed inside the heat collecting tube 6 .

[0055] In the internal circulation pipeline 1, one end of the return pipe 103 is connected to the water pipe 101. Before the connection, a second one-way valve 108 is installed on the return pipe 103. The second one-way valve 108 effectively relieves the pressure of water pressure on the water pump 104. The other end of the return pipe 103 is connected between the downpipe 102 and the mixing valve 110, close to the mixing valve 110, which is conducive to reducing the amount of cold water. Figure 1 As described, the one-way valve, the water pump 104 and the cleaning agent inlet 109 are connected in sequence from left to right in the return pipe 103. The cleaning agent inlet 109 is located between the water pump 104 and the mixing valve 110. The cleaning agent container filled with cleaning agent is installed on the cleaning agent inlet 109 through a threaded connection. When the cleaning function is not used, the cleaning agent inlet 109 is sealed with a threaded plug.

[0056] A sediment box 106 is provided at the bottom of the inner circulation pipeline 1. The sediment box 106 is provided as a transparent box body with an opening at the top and a drain valve 107 at the bottom. The scale brought down slowly during daily water circulation is precipitated in the sediment box 106. The scale condition in the water tank can be judged by the deposition of the sediment box 106. When cleaning, the sewage is discharged from the drain valve 107 of the sediment box 106.

[0057] A large cleaning opening is provided in the middle of the dirt box 106, which is accessible by hand and is used to clean the dirt box 106. The opening is usually closed with a lid. When the dirt box 106 needs to be cleaned, the first manual valve 111 at the upper end of the dirt box 106 is closed first, and then the lid on the cleaning opening is opened for cleaning. In addition, the closing of the drain valve 107 can be controlled separately by the controller 5 to manually drain the dirt or empty the water in the solar water heater.

[0058] An internal circulation pipeline 1 is arranged in the solar water heater, a heater is arranged in the water storage tank 2 and power is provided by a water pump 104, so that the hot water pipe is filled with hot water at all times or as needed. By circulating hot water intermittently every day to make the water in the barrel flow, the formation of scale can be effectively reduced.

[0059] like Figure 2 The water tank 2 is cylindrical in shape, including the inner wall of the water tank, the insulation layer and the outer wall of the water tank. There is an exhaust port on the top of the water tank to discharge the air pressure generated by heating. The side of the water tank 2 has a heater installation port 206, a magnesium rod installation port, a water temperature sensor installation port, a water level sensor installation port 205 and a water tank cleaning component 3 installation port. The middle part of the bottom of the water tank 2 is convex downward, preferably 15° convex, and a downward threaded opening is provided in the middle of the convex part, which is convenient for installing and sealing the downpipe 102 and the water tank cleaning component 3. The middle part of the bottom of the water tank 2 is convex downward, so that scale is easily deposited at the convex part, which is convenient for the cleaning device to discharge the scale in the water tank 2.

[0060] The water pump 104 is used to provide power for the internal circulation pipeline 1 .

[0061] The controller 5 is electrically connected to the water pump 104 , the heater, the water temperature sensor, the water level sensor, the drain valve 107 and the automatic water supply valve 105 .

[0062] like Figure 3 As shown, the water tank cleaning assembly 3 includes:

[0063] The support plate 304 is fixedly connected to the water storage tank 2 , and the double water outlet knot 301 is fixed on the support plate 304 .

[0064] The top of the double water outlet junction 301 is flush with the inner wall 201 of the water storage tank, and the lower part is connected to the water supply pipe 101.

[0065] The rubber membrane 302 is configured to have a funnel-shaped structure and is fixed in the double water-passing junction 301 . A pressing sheet 303 for fixing the rubber membrane 302 is provided on the upper portion of the rubber membrane 302 .

[0066] The structure of the pressing sheet 303 is configured as a circular ring sheet with a through hole in the middle.

[0067] The bracket 306 has a top connected to the elbow 305 and a bottom connected to the support plate 304 .

[0068] The curved pipe 305 is arranged inside the water tank 2, and the curved pipe 305 is set to a structure in which the bottom diameter is larger than the top diameter, and there is a height difference between the top of the curved pipe 305 and the top of the double water outlet junction 301; the height difference between the bottom of the curved pipe 305 and the top of the double water outlet junction 301 is less than the height of the rubber membrane 302.

[0069] The bent pipe 305 is configured in such a structure to form a directional flow guide, increase the impact force of the water flow, and form a vortex in the water storage tank 2, so as to effectively clean the scale inside the water storage tank 2. During installation, the angle between the bent pipe 305 and the inner wall of the longer side of the inner wall 201 of the water storage tank is set to 30-60 degrees, preferably 40 degrees.

[0070] Specifically, the structure of the bracket 306 is a circular ring at the top, four legs are evenly welded at the bottom of the circular ring, and the bottom ends of the legs are fixedly connected to the support plate 304 by screws. The elbow 305 is fixedly welded to the circular ring.

[0071] The sewer pipe connecting device 307 is arranged inside the water storage tank 2 and connected to the sewer pipe 102. The sewer pipe connecting device 307 is configured as an overall L-shaped three-way pipeline, including a first port 3071 on the top, a second port 3072 on the bottom and a third port 3073 on the side. A first one-way valve 309 is provided on one side of the third port 3073 of the sewer pipe connecting device 307. A column 310 is provided on the pipe wall on one side of the third port 3073. A first floating plug 308 that can move with water is connected to the column 310. When there is no water, the first floating plug 308 falls exactly on the third port 3073 to play a blocking role.

[0072] The sewer pipe connection device 307 is provided with a slot for installing a sealing ring 311 , which is installed in cooperation with the conversion joint 401 .

[0073] The elbow 305 is configured as a retractable multi-section elbow 305, with spring pieces 312 connected at both ends of the multi-section elbow 305, one end of the spring piece 312 being disposed at the top of the multi-section elbow 305, and the other end of the spring piece 312 being disposed on the sewer pipe 102, and a threading ring for the spring piece 312 to pass through being disposed at the top of the multi-section elbow 305. The function of the spring piece 312 is to limit the outlet direction of the multi-section elbow 305. The spring piece 312 is selected from a material with strong elasticity.

[0074] The bottom diameter of the multi-section elbow 305 is in a fixed ratio with the bottom diameter of the rubber membrane 302. The installation height of the double water outlet knot 301 device and the diversion bend nozzle device is determined according to the ratio. The size of the rubber membrane 302 and the size of the matching part of the double water outlet knot 301 device are in a fixed ratio to ensure that the water flow can make the rubber membrane 302 flip upward when the water is supplied. For example, the rubber membrane (302) is 4 cm long, the top outer diameter is 2 cm, the bottom outer diameter is 5 cm, and the distance between the front end of the multi-section elbow 305 and the double water outlet knot 301 device is 3 cm; the outer diameter of the rubber membrane 302 is 3 cm, and the bottom inner diameter of the multi-section directional diversion bend nozzle is 3.1 cm.

[0075] Specifically, when the controller 5 controls the water pump 104 to work and water flows upward from the lower water pipe 102, the rubber membrane 302 is turned upward by the thrust of the water to guide the water into the multi-section curved pipe 305 above; when water flows downward from the upper water pipe 101 or the water does not flow, the rubber membrane 302 is turned downward by the thrust of the water or its own gravity to allow water or sediment to enter the pipeline directly from all sides without obstacles.

[0076] like Figure 4 As shown, in another embodiment, the curved pipe 305 can also be configured to have a structure in which the bottom diameter is larger than the top diameter and the middle diameter is larger than the bottom diameter.

[0077] like Figures 5 to 7 As shown, the heat collecting tube 6 cleaning assembly includes: The heat collecting tube 6 cleaning assembly includes:

[0078] The conversion joint 401 is arranged inside the water storage tank 2, one end of the conversion joint 401 is connected to the downpipe connection device 307, and the other end is connected to the first flow guide pipe 402. The conversion joint 401 is L-shaped as a whole, and has a convex groove protruding outward at the end connected to the downpipe connection device 307, and the size of the convex groove matches the groove on the downpipe connection device 307. The conversion joint 401 is made of a material that is resistant to high temperature and easy to shape.

[0079] The first flow guide pipe 402 is disposed inside the water storage tank 2 , one end of the first flow guide pipe 402 is connected to the conversion joint 401 , and the other end of the first flow guide pipe 402 is connected to the second flow guide pipe 403 .

[0080] The second flow guide pipe 403 includes a main pipe and a plurality of branch pipe joints; the main pipe is arranged on the inner wall 201 of the water storage tank, and the branch pipe joints are connected to the third flow guide pipe 404 and inserted into the heat collecting pipe 6.

[0081] The third flow guide tube 404 is arranged inside the heat collecting tube 6. The bottom end of the third flow guide tube 404 is shaped like a hook. The opening of the hook is arranged like a bell mouth. A second floating plug 406 that can move with the water is arranged above the bell mouth. When there is no water, the second floating plug 406 falls exactly on the tail port to play a blocking role.

[0082] The height at which the first flow guide tube 402 is arranged in the water tank 2 is higher than the height at which the second flow guide tube 403 is arranged in the water tank 2, thereby reducing the air retained in the tube and facilitating the formation of a siphon.

[0083] A support pad 405 is provided outside the third flow guide tube 404, and the support pad 405 is used to support the third flow guide tube 404 in the heat collecting tube 6. The support pad 405 is a circular ring plate connected by four connecting rods, with a through hole in the middle, and the third flow guide tube 404 passes through the through hole.

[0084] The first flow guide tube 402 can be made of metal or plastic with good plasticity, shapeable tube wall and corrosion resistance. The second flow guide tube 403 and the third flow guide tube 404 can be made of metal with good plasticity and good thermal conductivity, preferably copper.

[0085] The main body shape of the first floating plug 308 and the second floating plug 406 is set to be a spherical structure, preferably a teardrop shape, and the material is designed to float in water, preferably rubber.

[0086] Specifically, the main pipe and the branch pipe joint can be separately packaged or integrated. The main pipe can move slightly forward, backward, left, right, up and down in the barrel through multiple sets of support frames, and the bottom end of the support frame is welded to the inner wall of the water tank. The branch pipe joint is provided with an internal thread near the end of the heat collecting pipe 6, and the top of the third guide pipe 404 is provided with an external thread, and the two are meshed and connected.

[0087] like Fig. 9 As shown, the antifreeze assembly includes a second flow guide pipe 403, a third flow guide pipe 404, a water pump 8 and a solenoid valve 9 arranged at the right end of the second flow guide pipe 403, and a heat collecting pipe temperature sensor 10 arranged at the bottom of the third flow guide pipe 404. The water pump 8, the solenoid valve 9 and the heat collecting pipe temperature sensor 10 are electrically connected to the controller 5.

[0088] The specific working process is:

[0089] 1. Automatic water tank cleaning:

[0090] After the solar water heater has been used for a period of time, if the water quality is reduced or the scale is increased through the sedimentation box 106, the second manual valve 112 is closed, the mixing valve 110 is kept closed, and a container filled with cleaning agent is installed on the cleaning agent inlet 109. The second manual valve 112 is opened, and the automatic water tank cleaning function is started through the controller 5: all functions are locked, the water level is automatically adjusted to a specified height (higher than the column 310 to prevent the first floating plug 308 from blocking the third port 3073), the water pump 104 is automatically started, and the water in the solar water heater begins to enter the return pipe 103 from the downpipe 102 under the action of the water pump, dissolves and carries away the cleaning agent into the uppipe 101, and further the water enters the water storage tank 2 from bottom to top. When water flows through the double water outlet junction 301, the rubber membrane 302 in the double water outlet junction 301 turns upward due to the impact of water and turns to the bottom of the elbow 305, connecting the double water outlet junction 301 and the elbow 305 to form a closed pipe. Water flows into the elbow 305 along the closed pipe and sprays out from the mouth of the elbow 305 to form a vortex, flushing the scale around the inner wall 201 of the water storage tank. After a period of circulation time, the detergent is fully dissolved and brought into the water storage tank 2. Further, the water pump 104 stops working to allow the detergent to fully soak the scale for a period of time. Then the water pump 104 is automatically started again to perform vortex flushing and cleaning, the water pump 104 stops working, and the drain valve 107 is automatically opened to drain the sewage in the water tank 2 (when water flows down through the double water port knot 301, the rubber membrane 302 turns down, and since the top of the double water port knot 301 is flush with or slightly lower than the inner wall 201 of the water tank, water or sediment can directly enter the pipeline from all sides without obstacles, so it can be drained). The water supply valve 105 is further automatically opened to supply water to a specified height, and the water pump 104 is automatically started to further circulate and flush the water tank 2, the downpipe 102, the uppipe 101 and the return pipe 103, and then the drain valve 107 is automatically opened to drain, and finally the water supply valve 105 is automatically opened to supply water to a set water level, and the heater is automatically turned on to heat to a set temperature, and the automatic water tank cleaning is completed.

[0091] The water in the water tank 2 may lose its temperature during the automatic cleaning cycle, which may reduce the descaling effect. Therefore, the heater will automatically heat the water during the cleaning cycle to ensure the water temperature, thereby achieving a better descaling effect.

[0092] 2. Automatic comprehensive cleaning:

[0093] This cleaning content includes automatic water tank cleaning and automatic heat collecting pipe cleaning, and the cleaning order is automatic water tank cleaning first and then automatic heat collecting pipe cleaning. After starting, the preliminary work of automatic water tank cleaning remains unchanged. After "soaking the scale for a period of time. Then automatically starting the water pump 104 again for vortex flushing cleaning", the water pump 104 does not stop working, and immediately enters the preparation work for automatic heat collecting pipe cleaning: automatically open the drain valve 107, start to discharge sewage, when the water level drops to the third port 3073, the first floating plug 308 blocks the third port 3073, so that the water in the water storage tank 2 can only enter through the opening at the end of the third conduit 404, and automatically closes the drain valve 107. At this time, the water pump 104 also stops working, and prompts to add detergent. Close the second manual valve 112, keep the mixing valve 110 closed, replace the container filled with cleaning agent and install it on the cleaning agent delivery port 109, open the second manual valve 112, and start the automatic collector pipe cleaning function through the controller 5: the water pump 104 is automatically started, and the water in the solar water heater enters the third conduit 404 from the end of the third conduit 404 under the action of the water pump, and then enters the second conduit 403, and then enters the first conduit 402, and then enters the sewer pipe 101 and the return pipe 103 through the water pipe connecting device 307. Similarly, the cleaning agent is finally dissolved and taken away to enter the water storage tank 2 and the collector pipe 6. After further soaking and secondary circulation flushing, after sufficient cleaning, the water pump 104 and the sewage valve 107 are automatically opened at the same time to discharge sewage. When the water in the water storage tank 2 cannot enter the heat collecting pipe 6, the water in the heat collecting pipe 6 is sucked out through the third conduit 404 under the action of the water pump and siphon. When the water in any heat collecting pipe 6 is sucked out, the second floating plug 406 at the end of the third conduit 404 will block the third conduit 404 so as to guide the water in other heat collecting pipes. When the water in all the heat collecting pipes is drained out, the water pump 104 automatically stops, and further automatically opens the water supply valve 105 to supply water to the specified height, and automatically starts the water pump 104, and further circulates and flushes the water storage tank 2, the downpipe 101, the water supply pipe 102, the return pipe 103 and the heat collecting pipe 6, and then automatically opens the sewage valve 107, and the water pump 104 continues to work until the water in the heat collecting pipe is drained out. Finally, the water supply valve 105 is automatically opened to supply water to the set water level, and the heater is automatically turned on to heat to the set temperature, and the automatic comprehensive cleaning is completed.

[0094] The height at which the first flow guide pipe 402 is arranged in the water tank 2 is higher than the height at which the second flow guide pipe 403 is arranged in the water tank 2, so as to avoid premature pressure relief caused by excessive retained air during the automatic heat collecting tube cleaning and emptying process.

[0095] 3. Antifreeze:

[0096] In normal use in winter, since the upper water pipe 101 and the lower water pipe 102 are laid in parallel, the lower water pipe 102 is always flowing with hot water, which can bring a lot of heat to prevent the upper water pipe from freezing. The second conduit 403 and the third conduit 404 in the water storage tank 2 and the heat collecting pipe 6 are copper conduits with good thermal conductivity, which can also prevent the heat collecting pipe 6 from freezing. If it is not used for a long time in winter, it can be emptied to prevent freezing.

[0097] Emptying method: close the water supply valve 105, force the drain valve 107 to open through the controller 5, drain the water in the water storage tank 2 and the heat collecting pipe 6, and then turn off all power supplies to protect the entire solar water heater system from freezing.

[0098] In extreme weather conditions, the heat collecting tube cannot automatically absorb sunlight for heating for a long time, so that the water temperature in the heat collecting tube 6 is much lower than the water temperature in the water tank. When the heat collecting tube temperature sensor 10 at the end of the heat collecting tube 6 senses that the water temperature is lower than 2°C, the solenoid valve 9 and the water pump 8 are automatically opened to transport hot water to the second conduit 403. Due to the long first conduit 402 and the downpipe 102 and the effect of the one-way valve 309, the transported hot water can only be discharged through the end of the third conduit 404, and the hot water thus enters the bottom of the heat collecting tube 6. When the heat collecting tube temperature sensor 10 senses that the water temperature reaches the set temperature, the water pump 8 is automatically stopped and the solenoid valve 9 is closed. This has an antifreeze effect on the heat collecting tube 6.

[0099] The above-described embodiments of the present invention do not constitute a limitation on the protection scope of the present invention. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A solar water heater capable of automatic cleaning and antifreeze, characterized in that: It comprises a water storage tank (2), a heat collecting tube (6) and a cleaning mechanism; the cleaning mechanism comprises: The internal circulation pipeline (1) comprises an upper water pipe (101) and a lower water pipe (102); a return water pipe (103) is arranged between the upper water pipe (101) and the lower water pipe (102); and a cleaning agent injection port (109) and a water pump (104) are arranged on the return water pipe (103); A water tank cleaning assembly (3) is arranged at the bottom of the water tank (2) and is connected to the internal circulation pipeline (1); A heat collecting tube (6) cleaning component, one end of which is arranged inside the water storage tank (2) and connected to the internal circulation pipeline (1), and the other end of which is arranged inside the heat collecting tube (6); The water tank cleaning assembly (3) comprises: a support plate (304) fixedly connected to the water tank (2), a double water outlet knot (301) fixed on the support plate (304); the double water outlet knot (301) having a top flush with or slightly lower than the inner wall (201) of the water tank, and a lower portion connected to the upper water pipe (101); a rubber membrane (302) arranged in a funnel-shaped structure and fixed in the double water outlet knot (301), the upper portion of the rubber membrane (302) A pressing plate (303) is provided with a fixed rubber membrane (302); the pressing plate (303) is arranged in the double water outlet junction (301), and is structured as a circular ring plate with a through hole in the middle; a bracket (306), the top of the bracket (306) is connected to the curved pipe (305), and the bottom of the bracket (306) is connected to the support plate (304); the curved pipe (305) is arranged inside the water storage tank (2), and the curved pipe (305) is arranged to have a large bottom diameter. The structure has a top diameter, a height difference between the top of the curved pipe (305) and the top of the double water outlet junction (301), and the height difference is smaller than the height of the rubber membrane (302); a downpipe connecting device (307) is arranged inside the water storage tank (2) and connected to the downpipe (102); the downpipe connecting device (307) is arranged as a three-way pipeline in an overall L-shape, including a first port (3071) on the top, a second port (3072) on the bottom and a third port (3073) on the side; a first check valve (309) is arranged on one side of the third port (3073) of the downpipe connecting device (307); a column (310) is arranged on the pipe wall on one side of the third port (3073); a first floating plug (308) that can move with water is connected to the column (310); when there is no water, the first floating plug (308) is exactly located at the third port (3073) to play a blocking role.

2. The solar water heater capable of automatic cleaning and antifreezing according to claim 1, characterized in that: The angle between the curved pipe (305) and the inner wall of the longer side of the water storage tank (2) is set in the range of 30 to 60 degrees.

3. The solar water heater capable of automatic cleaning and antifreezing according to claim 1, characterized in that: The curved pipe (305) is configured as a retractable multi-section curved pipe (305), and two ends of the curved pipe (305) are connected to a spring sheet (312).

4. The solar water heater capable of automatic cleaning and antifreezing according to claim 1, characterized in that: The curved pipe (305) is configured to have a structure in which the bottom diameter is larger than the top diameter, and the middle diameter is larger than the bottom diameter.

5. The solar water heater capable of automatic cleaning and antifreezing according to claim 1, characterized in that: The water tank (2) comprises an inner wall (201) of the water tank, a heat-insulating layer and an outer wall of the water tank (2); an exhaust port is arranged on the top of the water tank (2); a heater mounting port (206), a magnesium rod mounting port, a water temperature sensor mounting port, and a water level sensor mounting port (205) are arranged on the side of the water tank (2); the bottom of the inner wall (201) of the water tank is convex downwards, an opening is arranged at the convexity, and the water tank cleaning component (3) passes through the opening to connect with the water tank (2).

6. The solar water heater capable of automatic cleaning and antifreezing according to claim 1, characterized in that: The heat collecting tube (6) cleaning component comprises: A conversion joint (401) is arranged inside the water storage tank (2), one end of the conversion joint (401) is connected to the downpipe connection device (307), and the other end of the conversion joint (401) is connected to the first flow guide pipe (402); The first flow guide pipe (402) is arranged inside the water storage tank (2); one end of the first flow guide pipe (402) is connected to the conversion joint (401), and the other end of the first flow guide pipe (402) is connected to the second flow guide pipe (403); The second flow guide pipe (403) comprises a main pipe and a plurality of branch pipe joints; the main pipe is arranged on the inner wall (201) of the water storage tank, and the branch pipe joints are connected to the third flow guide pipe (404) and inserted into the heat collecting pipe (6); The third flow guide pipe (404) is arranged inside the heat collecting pipe (6); the bottom end of the third flow guide pipe (404) is shaped like a hook, and the opening of the hook is arranged like a bell mouth. A second floating plug (406) that can move with water is arranged above the bell mouth. When there is no water, the second floating plug (406) is located exactly at the bell mouth to play a blocking role; A support pad (405) is provided outside the third flow guide tube (404), and the support pad is used to support the third flow guide tube (404) inside the heat collecting tube (6).

7. The solar water heater capable of automatic cleaning and antifreezing according to claim 1, characterized in that: It also includes an antifreeze component, which includes a second flow guide pipe (403), a third flow guide pipe (404), a water pump (8) and a solenoid valve (9) arranged at one end of the second flow guide pipe (403), and a heat collecting pipe temperature sensor (10) arranged at the bottom of the third flow guide pipe (404).

8. The solar water heater capable of automatic cleaning and antifreezing according to claim 1, characterized in that: A dirt settling box (106) is provided at the bottom of the internal circulation pipeline (1); the dirt settling box (106) is provided as a transparent box body, the top opening of which is connected to the water supply pipe (101), a cleaning port is provided in the middle for cleaning the dirt settling box (106), and a sewage discharge valve (107) is provided at the bottom.

9. The solar water heater capable of automatic cleaning and antifreezing according to claim 8, characterized in that: It also includes a controller (5), wherein the controller (5) is electrically connected to the water pump (104), the heater, the water temperature sensor, the water level sensor, the sewage valve (107) and the automatic water supply valve (105).

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