CN207050245U - A kind of anti-freeze solar hot-water heating system applied to rural area - Google Patents

A kind of anti-freeze solar hot-water heating system applied to rural area Download PDF

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Publication number
CN207050245U
CN207050245U CN201720807178.6U CN201720807178U CN207050245U CN 207050245 U CN207050245 U CN 207050245U CN 201720807178 U CN201720807178 U CN 201720807178U CN 207050245 U CN207050245 U CN 207050245U
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water
magnetic valve
solar
valve
solar energy
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CN201720807178.6U
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张晓峰
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张晓峰
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers

Abstract

A kind of anti-freeze solar hot-water heating system applied to rural area, including solar water heater, solar water heater are connected with water tank by solar energy moisturizing magnetic valve and water tank moisturizing magnetic valve;Solar water heater is connected with solar energy by solar energy outlet conduit and frost-proof triple magnetic valve and empties pipeline;Solar water heater mends cold water magnetic valve by pipeline, general solenoid valve one and electric heater and is connected with electric heater, and electric heater is connected with general solenoid valve two by electric heater concurrent heating water solenoid valve, and general solenoid valve two is connected with frost-proof triple magnetic valve.The beneficial effects of the utility model be with solar energy heating function, pipeline air emptying function, outdoor temperature monitoring function, with water-carrying capacity monitoring function, magnetic valve antifreeze function, electricity auxiliary heating function, full electric heating function and lower water temperature function, the use of rural area is very easy to, there is extensive application value.

Description

A kind of anti-freeze solar hot-water heating system applied to rural area
Technical field
It the utility model is related to technical field of solar, and in particular to a kind of anti-freezing solar water system applied to rural area System.
Background technology
According to newest population census statistics, at present, China Rural Population accounts for 4 the percent of Chinese total population more about 600,000,000 More than ten.Due to lag of economic development, living standards of the people are not high for most of rural area, particularly in some remote mountain areas, Even water shortage short of electricity also be present.Bathing, essential activity in this people's daily life, for some in rural area It is not particularly convenient for the people of area life.The utilization of solar energy, effectively alleviate this problem.Solar energy is mesh The preceding available pollution-free sustainable energy used, while be also the free energy, so many fields apply solar energy money Source.
In field of water heaters, solar water heater occupies very big market always, and convenience is provided for people's life, but It is that it also has in place of some shortcomings:First, in the winter in many areas, because ambient temperature is too low, cause solar pipe to freeze Freezing phenomenon is split, causes user to lose, influences normal use;Second, in continuous rainy weather, the situation of light application time deficiency Under, solar water heater has water temperature phenomenon not up to standard, can not meet user's normal use;3rd, rural area is directed to, too The use of positive energy water heater is also influenceed by local water supply time and pressure of supply water
Utility model content
The purpose of this utility model is to provide a kind of anti-freeze solar hot-water heating system applied to rural area, above-mentioned to solve The problem of being proposed in background technology.
To achieve the above object, the utility model provides following technical scheme:
A kind of anti-freeze solar hot-water heating system applied to rural area, including solar water heater, solar water heater pass through Solar energy moisturizing magnetic valve and water tank moisturizing magnetic valve are connected with water tank;Solar water heater is by solar energy outlet conduit and prevents Freeze three-way magnetic valve and be connected with solar energy emptying pipeline;Solar water heater passes through pipeline, general solenoid valve one and electric heater Mend cold water magnetic valve and be connected with electric heater, electric heater is connected with general solenoid valve by electric heater concurrent heating water solenoid valve Two, general solenoid valve two is connected with frost-proof triple magnetic valve;The water tank passes through radiator drain road and water tank water outlet electromagnetism Valve is connected with gondola water faucet cold valves, and gondola water faucet cold valves are connected with gondola water faucet, and gondola water faucet is also associated with gondola water faucet hot water valve, gondola water faucet hot water valve with it is general Pipeline between three-way electromagnetic valve two and electric heater concurrent heating water solenoid valve is connected, and the gondola water faucet hot water valve also passes through electric heater Outlet conduit, force (forcing) pump and electric heater water solenoid valve are connected with electric heater;The moisturizing total pipeline is total by moisturizing Magnetic valve is connected with solar water heater, and the solar water heater is connected with emptying solenoid valve by pipeline.
It is as the utility model further effect:The solar water heater includes solar energy shell, outside solar energy Shell is internally provided with solar energy inner bag, and solar energy inner bag outer end is provided with solar energy end cap, solar energy inner bag and solar energy end cap Between be provided with filter cap, liquid level sensor, pressure-equalizing pipe, three-way magnetic valve, temperature sensor protecting cover, temperature sensor And flowmeter.
As the utility model, further effect is:The three-way magnetic valve is installed on inside solar water heater, Surrounded by solar energy inner bag;Three-way magnetic valve water inlet connects solar energy inner bag;Three-way magnetic valve delivery port connection flow gauge and Solar energy outlet conduit, connection air scoop connection pressure-equalizing pipe, pipeline top installation filter cap.
As the utility model, further effect is:The frost-proof triple magnetic valve is outside common three-way magnetic valve Install one layer of vacuum heat-insulating layer additional;Frost-proof triple magnetic valve water inlet connects solar energy outlet conduit, frost-proof triple magnetic valve water outlet Mouth connection user's water service pipe road, evacuation port connection emptying pipeline.
As the utility model, further effect is:It is the solar energy moisturizing magnetic valve, general solenoid valve one, antifreeze Three-way magnetic valve, general solenoid valve two, the total magnetic valve of moisturizing, emptying solenoid valve, gondola water faucet cold valves, water tank moisturizing magnetic valve, water Case water solenoid valve, electric heater mend cold water magnetic valve, electric heater concurrent heating water solenoid valve, electric heater water solenoid valve plus Press pump, gondola water faucet hot water valve, liquid level sensor, three-way magnetic valve, temperature sensor and flowmeter electrically connect with control panel.
The beneficial effects of the utility model are with solar energy heating function, pipeline air emptying function, outdoor temperature monitoring work( Can, with water-carrying capacity monitoring function, magnetic valve antifreeze function, electricity auxiliary heating function, full electric heating function and lower water temperature function, The use of rural area is very easy to, there is extensive application value.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of the utility model solar water heater internal structure;
Fig. 3 is the structural representation of the utility model three-way magnetic valve;
Fig. 4 is the structural representation of the utility model frost-proof triple magnetic valve;
Fig. 5 is the utility model magnetic valve state a structural representation;
Fig. 6 is the utility model magnetic valve state b structural representation.
In figure:1st, solar energy moisturizing magnetic valve;2nd, solar water heater;3rd, solar energy outlet conduit;4th, general solenoid valve One;5th, frost-proof triple magnetic valve;6th, solar energy emptying pipeline;7th, general solenoid valve two;8th, the total magnetic valve of moisturizing;9th, moisturizing house steward Road;10th, emptying solenoid valve;11st, gondola water faucet cold valves;12nd, water tank moisturizing magnetic valve;13rd, water tank water solenoid valve;14th, water tank; 15th, radiator drain road;16th, electric heater mends cold water magnetic valve;17th, electric heater concurrent heating water solenoid valve;18th, electric heater; 19 electric heater water solenoid valves;20th, force (forcing) pump;21st, electric water heater outlet pipe road;22nd, control panel;23rd, gondola water faucet;24th, flower Spill hot water valve;25th, solar energy shell;26th, solar energy inner bag;27th, filter cap;28th, liquid level sensor;29th, pressure-equalizing pipe; 30th, three-way magnetic valve;31st, solar energy end cap;32nd, temperature sensor protecting cover;33rd, temperature sensor;34th, flowmeter;35th, three Three-way electromagnetic valve water inlet;36th, three-way magnetic valve delivery port;37th, air scoop is connected;38th, frost-proof triple magnetic valve water inlet;39、 Frost-proof triple magnetic valve delivery port;40th, vacuum heat-insulating layer;41st, evacuation port.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belong to the scope of the utility model protection.
Refer to Fig. 1-Fig. 4, in the utility model embodiment, including solar water heater 2, solar water heater 2 pass through Solar energy moisturizing magnetic valve 1 and water tank moisturizing magnetic valve 12 are connected with water tank 14;Solar water heater 2 passes through solar energy outlet pipe Road 3 and frost-proof triple magnetic valve 5 are connected with solar energy emptying pipeline 6;Solar water heater 2 passes through pipeline, general solenoid valve 1 Cold water magnetic valve 16 is mended with electric heater and is connected with electric heater 18, and electric heater 18 passes through electric heater concurrent heating water solenoid valve 17 General solenoid valve 27 is connected with, general solenoid valve 27 is connected with frost-proof triple magnetic valve 5;The water tank 14 is gone out by water tank Waterpipe 15 and water tank water solenoid valve 13 are connected with gondola water faucet cold valves 11, and gondola water faucet cold valves 11 are connected with gondola water faucet 23, gondola water faucet 23 It is also associated between gondola water faucet hot water valve 24, gondola water faucet hot water valve 24 and general solenoid valve 27 and electric heater concurrent heating water solenoid valve 17 Pipeline be connected, the gondola water faucet hot water valve 24 also passes through electric water heater outlet pipe road 21, force (forcing) pump 20 and electric heater water outlet Magnetic valve 19 is connected with electric heater;The moisturizing total pipeline 9 is connected by the total magnetic valve 8 of moisturizing with solar water heater 2 Connect, the solar water heater 2 is connected with emptying solenoid valve 10 by pipeline.
The operational process of anti-freeze solar hot-water heating system is:Moisturizing total pipeline 9 is the system water source, is responsible for solar heat Hydrophone 2, water tank 14 and electric heater 18 carry out water-refilling operation by associated conduit and valve;Solar water heater 2 is absorbing In the presence of solar heat, solar energy is utilized, internal water is heated, is led hot water by solar energy outlet conduit 3 Go out, gondola water faucet hot water valve 24, the thermal water source used as gondola water faucet are flowed into by frost-proof triple magnetic valve 5;
Because water supply having time in part rural area limits, so water tank 15 is installed in outdoor roof, after its moisturizing, Gondola water faucet cold valves 11 are connected to by radiator drain road 15, the cold water source used as gondola water faucet;Under normal circumstances, using the sun Cold water in hot water and water tank 14 that can be in water heater 2 is respectively as cold and hot water source, by the Cold-hot water valve for adjusting gondola water faucet 23 Aperture control water temperature is used;When outdoor temperature is too low, and user does not have to water, to prevent solar water heater 2 and water tank 14 and its associated conduit it is freezing, system automatically turns on pipeline air emptying function, passes through solar energy and empties pipeline 6 and emptying solenoid valve 10 Water in pipeline is emptied, effective protection equipment is not damaged by frost;Cause when due to extraneous continuous rainy weather, light application time deficiency When the water temperature inside of solar water heater 2 is not up to standard, general solenoid valve 1 and electric heater moisturizing magnetic valve 17 are opened, makes the sun The energy inside warm water of water heater 2 flows into electric heater 18 by associated conduit and carries out reheating, when temperature is up to standard, passes through force (forcing) pump 20 pairs of water outlets are pressurizeed, as the thermal water source of gondola water faucet 23, then for users to use;It is protection equipment if ambient temperature is less than 0 degree It is not damaged by frost, solar water heater 2 and the internal water of water tank 14 all empty, and equipment can not work, and now, electric hot water are used alone Device 18 carries out using electrical heating, for users to use hot water.
The solar water heater includes solar energy shell 25, and solar energy enclosure is provided with solar energy inner bag 26, too It is positive can the outer end of inner bag 26 be provided with solar energy end cap 31, be provided between solar energy inner bag 26 and solar energy end cap filter cap 27, Liquid level sensor 28, pressure-equalizing pipe 29, three-way magnetic valve 30, temperature sensor protecting cover 32, temperature sensor 33 and flow Meter 34;
The three-way magnetic valve 30 is installed on inside solar water heater 2, is surrounded by solar energy inner bag 26, and it is anti-to reach insulation Only freezing purpose;The water inlet of three-way magnetic valve 35 connection solar energy inner bag 26, is the source that whole solar energy system hot water supplies water Head;The delivery port connection flow gauge 34 of three-way magnetic valve 36 and solar energy outlet conduit 3, connection air scoop 37 connect pressure-equalizing pipe 29, pipeline top installation filter cap 27, prevent introduced contaminants from entering solar energy system;
The frost-proof triple magnetic valve 5 is one layer of vacuum heat-insulating layer 40 of installation outside common three-way magnetic valve, reaches isolation Valve internal-external heat exchange acts on, and it is freezing to prevent that magnetic valve from freezing in low temperature environment;Frost-proof triple magnetic valve water inlet 38 connects the sun Energy outlet conduit 3, frost-proof triple magnetic valve delivery port 39 connect user's water service pipe road, usually the equipment such as gondola water faucet 23, evacuation port 41 connection emptying pipelines 6, pipeline water thus discharge by mouth;
When user uses hot water, the inside three-way magnetic valve delivery port 36 of three-way magnetic valve 30 is opened, and connection air scoop 37 closes Close, the inside frost-proof triple magnetic valve water inlet of frost-proof triple magnetic valve 5 is made a call to 38 and opened, and evacuation port 41 is closed, general solenoid valve one 4 dozens Open, hot water forms path by solar energy inner bag 26 to gondola water faucet 23, for users to use hot water.
When user stops using hot water, system is judged by temperature sensor 33 and flowmeter 34, if outdoor temp Degree is less than 1 degree Celsius(In view of the precision of sensor, amplify safety coefficient, it is critical value to select 1 degree Celsius)And flow is 0 to surpass Spend 100 seconds(In view of preventing user from cutting off the water supply temporarily, system is avoided to cause erroneous judgement)Then system trigger pipeline emptying work, this When, the inside three-way magnetic valve delivery port 36 of three-way magnetic valve 30 is closed, and connection air scoop 37 is opened, in frost-proof triple magnetic valve 5 Portion's frost-proof triple magnetic valve delivery port 39 is closed, and evacuation port 41 is opened, and water is discharged by solar energy emptying pipeline 6 in pipe, and is managed The connection of road upper end is extraneous, ensure that pipeline upper and lower side pressure balance, water is smoothly emptied, and reaches pipeline emptying, prevents freezing The purpose of pipeline and equipment.
In the case of continuous rainy weather, light application time deficiency, solar water heater has water temperature phenomenon not up to standard, this When can open general solenoid valve 1 and electric heater concurrent heating water solenoid valve 17, the water for making solar energy internal temperature not high flows into In electric heater 18, reheating is carried out, reaches the temperature that user uses, realizes the purpose of electricity auxiliary heating.Electrical heating is completed After, electric heater water solenoid valve 19 is opened, hot water flows into gondola water faucet hot water valve 24 by force (forcing) pump 20, for users to use.
When outdoor temperature is too low, to prevent solar water heater 2 and water tank 14 and its pipeline freezing, it is necessary to be set to the two Standby and its pipeline carries out emptying process, while opens general solenoid valve 1 and electric heater benefit cold water magnetic valve 16 to electric hot water Device 18 carries out moisturizing, and electricity consumption carries out heating use.
The solar energy moisturizing magnetic valve 2, general solenoid valve 1, frost-proof triple magnetic valve 5, general solenoid valve 27, benefit The total magnetic valve 8 of water, emptying solenoid valve 10, gondola water faucet cold valves 11, water tank moisturizing magnetic valve 12, water tank water solenoid valve 13, electric heating Hydrophone mends cold water magnetic valve 16, electric heater concurrent heating water solenoid valve 17, electric heater water solenoid valve 19, force (forcing) pump 20, gondola water faucet Hot water valve 24, liquid level sensor 28, three-way magnetic valve 30, temperature sensor 33 and flowmeter 34 electrically connect with control panel.
The utility model has following several functions:Solar energy heating function:Water is heated using solar energy, reached Certain temperature is for users to use;
Pipeline air emptying function:Emptying operation is carried out to the water of solar energy and pipeline and valve internal, prevented due to outer Boundary's temperature is low to cause water freezing inside pipeline, the phenomenon of freezing water tank and pipeline and valve;
Outdoor temperature monitoring function:Outdoor temperature is monitored, judges whether outdoor reaches icing shape according to monitor value State, it is that the energy supply of tube used for bottom pouring evacuating pipeline prevents one of freezing foundation condition of pipeline;
With water-carrying capacity monitoring function:The water used user carries out flow and monitored in real time, judges that user is according to monitor value No use finishes, and prevents when outdoor temperature is low, water accumulation of pipeline freeze, be tube used for bottom pouring evacuating pipeline function prevent pipeline freezing according to According to one of condition;
Magnetic valve antifreeze function:Heat insulation protecting is carried out to magnetic valve, prevents that magnetic valve is freezing;
Electricity auxiliary heating function:In the case of continuous rainy weather, light application time deficiency, solar water heater has water Temperature phenomenon not up to standard, the water that this function can be not up to standard to temperature carry out reheating, reach user's requirement;
Full electric heating function:Too low in outdoor temperature, pipeline has been drained off, and solar energy can not be in use, use electric energy pair Water is heated, and reaches thermophilic with for users to use.
Lower water temperature function:By controlling the flow of hot and cold water, reach suitable water temperature to use.
Anti-freeze solar hot-water heating system applied to rural area is in addition to the basic heating function for possessing regular solar, according to room The situation of outer temperature and solar water-temperature, electricity auxiliary heating function, pipeline air emptying function can be turned on or off and electricity adds completely Hot function, it is as shown in table 1 that each function opens and closes situation:
1 each function of table opens and closes situation
Each function more than realizing, the path of three-way magnetic valve 30 and frost-proof triple magnetic valve 5 switches in main dependence system Come what is realized.The two three-way magnetic valves 30 are One In and Two Out formula magnetic valve, built-in electromagnetic valve coil;When electromagnetic valve coil leads to When electric, coil moves down, and compresses and is opened by spring, the first via, the second tunnel is closed, as shown in Figure 5;When electromagnetic valve coil powers off, Coil is restored to the original state by spring force, and the first via is closed, and the second tunnel is opened, as shown in fig. 6, realizing the switching of path.
Three-way magnetic valve 30 and the analysis of the channel status of frost-proof triple magnetic valve 5 are as shown in table 2 and table 3:
Status Name Water inlet Delivery port Connect air scoop Mark
State 1 Open Open Close A1
State 2 Close Open Open A2
The three-way magnetic valve channel status of table 2 is analyzed
Status Name Water inlet Delivery port Evacuation port Mark
State 1 Open Open Close B1
State 2 Open Close Open B2
The frost-proof triple magnetic valve channel status of table 3 is analyzed
It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and And in the case of without departing substantially from spirit or essential attributes of the present utility model, it can realize that this practicality is new in other specific forms Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new The scope of type limits by appended claims rather than described above, it is intended that the equivalency fallen in claim is contained All changes in justice and scope are included in the utility model.Any reference in claim should not be considered as limitation Involved claim.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art It is appreciated that other embodiment.

Claims (5)

1. a kind of anti-freeze solar hot-water heating system applied to rural area, it is characterised in that including solar water heater, solar heat Hydrophone is connected with water tank by solar energy moisturizing magnetic valve and water tank moisturizing magnetic valve;Solar water heater passes through solar energy water outlet Pipeline and frost-proof triple magnetic valve are connected with solar energy emptying pipeline;Solar water heater passes through pipeline, the and of general solenoid valve one Electric heater mends cold water magnetic valve and is connected with electric heater, and electric heater is connected with commonly by electric heater concurrent heating water solenoid valve Magnetic valve two, general solenoid valve two are connected with frost-proof triple magnetic valve;The water tank is gone out by radiator drain road and water tank Water solenoid valve is connected with gondola water faucet cold valves, and gondola water faucet cold valves are connected with gondola water faucet, and gondola water faucet is also associated with gondola water faucet hot water valve, gondola water faucet hot water Pipeline between valve and general solenoid valve two and electric heater concurrent heating water solenoid valve is connected, and the gondola water faucet hot water valve also passes through electricity Water outlet of water heater pipeline, force (forcing) pump and electric heater water solenoid valve are connected with electric heater;The moisturizing total pipeline passes through The total magnetic valve of moisturizing is connected with solar water heater, and the solar water heater is connected with emptying solenoid valve by pipeline.
A kind of 2. anti-freeze solar hot-water heating system applied to rural area according to claim 1, it is characterised in that it is described too Positive energy water heater includes solar energy shell, and solar energy enclosure is provided with solar energy inner bag, and solar energy inner bag outer end is provided with Solar energy end cap, filter cap, liquid level sensor, pressure-equalizing pipe, threeway are provided between solar energy inner bag and solar energy end cap Magnetic valve, temperature sensor protecting cover, temperature sensor and flowmeter.
3. a kind of anti-freeze solar hot-water heating system applied to rural area according to claim 2, it is characterised in that described three Three-way electromagnetic valve is installed on inside solar water heater, is surrounded by solar energy inner bag;In three-way magnetic valve water inlet connection solar energy Courage;Three-way magnetic valve delivery port connection flow gauge and solar energy outlet conduit, connection air scoop connection pressure-equalizing pipe, pipeline top End installation filter cap.
4. a kind of anti-freeze solar hot-water heating system applied to rural area according to claim 1, it is characterised in that described anti- It is one layer of vacuum heat-insulating layer of installation outside common three-way magnetic valve to freeze three-way magnetic valve;Frost-proof triple magnetic valve water inlet connects too Positive energy outlet conduit, frost-proof triple magnetic valve delivery port connection user's water service pipe road, evacuation port connection emptying pipeline.
A kind of 5. anti-freeze solar hot-water heating system applied to rural area according to claim 3, it is characterised in that it is described too Positive energy moisturizing magnetic valve, general solenoid valve one, frost-proof triple magnetic valve, general solenoid valve two, the total magnetic valve of moisturizing, emptying electromagnetism Valve, gondola water faucet cold valves, water tank moisturizing magnetic valve, water tank water solenoid valve, electric heater mend cold water magnetic valve, electric heater concurrent heating Water solenoid valve, electric heater water solenoid valve, force (forcing) pump, gondola water faucet hot water valve, liquid level sensor, three-way magnetic valve, TEMP Device and flowmeter electrically connect with control panel.
CN201720807178.6U 2017-07-05 2017-07-05 A kind of anti-freeze solar hot-water heating system applied to rural area Expired - Fee Related CN207050245U (en)

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CN201720807178.6U CN207050245U (en) 2017-07-05 2017-07-05 A kind of anti-freeze solar hot-water heating system applied to rural area

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Application Number Priority Date Filing Date Title
CN201720807178.6U CN207050245U (en) 2017-07-05 2017-07-05 A kind of anti-freeze solar hot-water heating system applied to rural area

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021184875A1 (en) * 2020-03-19 2021-09-23 江苏永生新能源科技有限公司 Vacuum tube water storage type solar water heating system and control method therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021184875A1 (en) * 2020-03-19 2021-09-23 江苏永生新能源科技有限公司 Vacuum tube water storage type solar water heating system and control method therefor

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