CN111424886A - Waterproof photovoltaic tile - Google Patents

Waterproof photovoltaic tile Download PDF

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Publication number
CN111424886A
CN111424886A CN202010242912.5A CN202010242912A CN111424886A CN 111424886 A CN111424886 A CN 111424886A CN 202010242912 A CN202010242912 A CN 202010242912A CN 111424886 A CN111424886 A CN 111424886A
Authority
CN
China
Prior art keywords
tile
water storage
waterproof
photovoltaic
storage tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202010242912.5A
Other languages
Chinese (zh)
Inventor
孙倩兰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202010242912.5A priority Critical patent/CN111424886A/en
Publication of CN111424886A publication Critical patent/CN111424886A/en
Withdrawn legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04DROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D1/00Roof covering by making use of tiles, slates, shingles, or other small roofing elements
    • E04D1/28Roofing elements comprising two or more layers, e.g. for insulation
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04DROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D1/00Roof covering by making use of tiles, slates, shingles, or other small roofing elements
    • E04D1/30Special roof-covering elements, e.g. ridge tiles, gutter tiles, gable tiles, ventilation tiles
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04DROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
    • E04D13/04Roof drainage; Drainage fittings in flat roofs, balconies or the like
    • E04D13/0404Drainage on the roof surface
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04DROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
    • E04D13/16Insulating devices or arrangements in so far as the roof covering is concerned, e.g. characterised by the material or composition of the roof insulating material or its integration in the roof structure
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00Supporting structures for PV modules
    • H02S20/20Supporting structures directly fixed to an immovable object
    • H02S20/22Supporting structures directly fixed to an immovable object specially adapted for buildings
    • H02S20/23Supporting structures directly fixed to an immovable object specially adapted for buildings specially adapted for roof structures
    • H02S20/25Roof tile elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04DROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D1/00Roof covering by making use of tiles, slates, shingles, or other small roofing elements
    • E04D1/30Special roof-covering elements, e.g. ridge tiles, gutter tiles, gable tiles, ventilation tiles
    • E04D2001/308Special roof-covering elements, e.g. ridge tiles, gutter tiles, gable tiles, ventilation tiles for special purposes not otherwise provided for, e.g. turfing tiles, step tiles
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04DROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
    • E04D13/04Roof drainage; Drainage fittings in flat roofs, balconies or the like
    • E04D13/0404Drainage on the roof surface
    • E04D2013/0495Drainage on the roof surface to storage tanks
    • 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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/10Photovoltaic [PV]
    • 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
    • Y02E10/50Photovoltaic [PV] energy

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)

Abstract

The invention provides a waterproof photovoltaic tile, and relates to the field of photovoltaic tiles. This waterproof photovoltaic tile utilizes flip to articulate on the tile, covers the photovoltaic board when flip turns over down, reaches waterproof effect, improves water-proof effects, avoids rainy weather photovoltaic board to expose outside and wet. Through the use of balancing weight and water storage tank's cooperation, in sunny day, the balancing weight sinks and drives the axostylus axostyle rotation, and the axostylus axostyle drives flip and upwards turns up. In rainy days, the weight of the water storage tank is increased and sunk, and the turnover cover is driven to turn down, so that the effect of controlling the rotation of the turnover cover is achieved.

Description

Waterproof photovoltaic tile
Technical Field
The invention relates to the technical field of photovoltaic tiles, in particular to a waterproof photovoltaic tile.
Background
With the increasing severity of environmental pollution, people pay more attention to environmental protection and energy conservation, and the photovoltaic tile is used for converting solar energy into electric energy and is composed of a common tile and a photovoltaic panel.
Traditional photovoltaic tile sets up the recess on the tile, puts into the recess with the photovoltaic board, again with the tile overlap joint in proper order and install on the roof. For example, the Chinese patent network discloses a solar photovoltaic tile with the patent number of 201310325108.3.
But the waterproof effect of the traditional photovoltaic tile is not good. Since the photovoltaic tiles need to be exposed to sunlight. The photovoltaic panel must be in contact with external light. In rainy day, the photovoltaic board directly exposes in the outside, even if the photovoltaic tile upper berth is equipped with the waterproof layer, the rainwater also has certain probability to flow in the tile recess, leads to the photovoltaic board to wet or the short circuit, influences the photovoltaic board and normally works, can lead to the photovoltaic board to scrap.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a waterproof photovoltaic tile, which solves the problems that the traditional photovoltaic tile in the background art is poor in waterproof effect and rainwater easily enters.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a waterproof photovoltaic tile comprises a tile, a photovoltaic plate and a flip cover hinged to the tile, wherein shaft levers are arranged on the front side and the rear side of the flip cover in an axisymmetric mode, grooves are formed in the tile, the photovoltaic plate is installed in the grooves, the flip cover is connected with a movable plate through the shaft levers, a balancing weight is installed at one end of the movable plate, a water storage tank is pivoted to the other end of the movable plate, and the flip cover is turned down when the water storage tank stores water; the water storage tank is internally provided with a U-shaped pipe, the bottom of the inner wall of the water storage tank is provided with an iron sheet, the water outlet end of the U-shaped pipe penetrates through the water storage tank and extends to the lower part of the water storage tank, and the water inlet of the water storage tank has a trend of always facing upwards through the iron sheet; the tile further comprises a waterproof plate, the waterproof plate is inserted into the groove in a plugged mode, the waterproof plate is located above the photovoltaic plate, a drain hole is formed in one side, close to the photovoltaic plate, of the tile, and the drain hole is located above the waterproof plate.
Preferably, the flip cover is provided with a rib relative to the groove, and the rib is inserted into the groove when the flip cover is turned down.
Preferably, the waterproof sheet is made of transparent plastic.
Preferably, the flap and the rim are made of a lightweight plastic.
Preferably, the movable plate is made of an EVA waterproof plate.
(III) advantageous effects
The invention provides a waterproof photovoltaic tile. The method has the following beneficial effects:
1. this waterproof photovoltaic tile utilizes flip to articulate on the tile, covers the photovoltaic board when flip turns over down, reaches waterproof effect, improves water-proof effects, avoids rainy weather photovoltaic board to expose outside and wet.
2. This waterproof photovoltaic tile uses through the cooperation of balancing weight and water storage box, and when fine day, the balancing weight sinks and drives the axostylus axostyle rotation, and the axostylus axostyle drives flip and upwards turns up. In rainy days, the weight of the water storage tank is increased and sunk, and the turnover cover is driven to turn down, so that the effect of controlling the rotation of the turnover cover is achieved.
3. This waterproof photovoltaic tile through be provided with U type pipe in the water storage box, forms the siphon effect when the liquid level in the water storage box is higher than U type pipe, and the water in the water storage box flows along U type pipe, plays the effect of drainage. After the weather turns fine, the rainwater in the water storage tank is automatically discharged, and the turnover cover is turned upwards again.
4. This waterproof photovoltaic tile has seted up the wash port on through the tile for the flip does not turn down and gets into rainwater along with the wash port discharge in the recess, avoids having the rainwater to pile up in the tile.
Drawings
FIG. 1 is a perspective view of the present invention in a structural state;
FIG. 2 is a top view of the structure of the present invention;
FIG. 3 is a cross-sectional view of the structure of the present invention;
FIG. 4 is a front view of the present invention;
FIG. 5 is a rear view of the structure of the present invention;
FIG. 6 is a perspective view of a second embodiment of the present invention;
FIG. 7 is a sectional view of the structure of the water tank of the present invention;
FIG. 8 is an open perspective view of the present invention;
fig. 9 is a close-up perspective view of the structure of the present invention.
In the figure: 1 tile, 11 photovoltaic panels, 12 waterproof boards, 13 support columns, 14 drainage holes, 15 grooves, 2 turning covers, 21 flanges, 3 shaft rods, 4 movable plates, 41 balancing weights, 42 water storage tanks, 43U-shaped pipes and 44 iron sheets.
Detailed Description
The embodiment of the invention provides a waterproof photovoltaic tile, which comprises a tile 1, a photovoltaic panel 11 and a flip cover 2 hinged on the tile 1, wherein shaft rods 3 are arranged on the front side and the rear side of the flip cover 2 in an axisymmetric mode, a groove 15 is formed in the tile 1, and the photovoltaic panel 11 is installed in the groove 15, as shown in figures 1-9.
The turning cover 2 is connected with a movable plate 4 through a shaft lever 3, one end of the movable plate 4 is fixedly provided with a balancing weight 41, the other end of the balancing weight 41 is pivoted with a water storage tank 42, and the turning cover 2 turns down when the water storage tank 42 stores water. The reservoir 42 inlet has a tendency to face upwards all the time through the iron sheet 44. Under the sunny condition, the weight of the water storage tank 42 and the flip cover 2 is lighter than that of the counterweight block 41, and the counterweight block 41 sinks to drive the flip cover 2 to flip upwards. When raining, the weight of constantly retaining in the water storage box 42 increases, and the total weight of water storage box 42 is greater than the total weight of flip 2 and balancing weight 41, and water storage box 42 sinks to drive flip 2 to turn down and lift up balancing weight 41.
The movable plate 4 is slightly inclined when the water storage tank 42 is empty, and one end of the movable plate 4 pivoted with the water storage tank 42 is slightly inclined towards the photovoltaic panel 11, so that the water storage tank 42 is convenient to sink in rainy days. The weight 41 is located at a distance from the shaft 3 that is less than the distance from the reservoir 42 to the shaft 3. By using the principle of lever, the distance between the counterweight 41 and the shaft lever 3 is a resistance arm, and the distance between the water storage tank 42 and the shaft lever 3 is a power arm. The power arm is longer than the resistance arm, so that the weight of the water storage tank 42 is increased to lift the balancing weight 41 in rainy days.
The tile 1 is provided with a support column 13 for supporting the flip 2. The movable plate 4 is made of an EVA waterproof plate. The EVA waterproof board has the characteristics of light material, durability, wear resistance, and good waterproofness and corrosion resistance.
Shaft lever 3 fixed mounting is on flip 2 for shaft lever 3 can drive flip 2 when rotatory and rotate, and during rainy, in the rainwater constantly got into water storage box 42, water storage box 42's weight gradually becomes river, lifts balancing weight 41, makes shaft lever 3 drive flip 2 and turns over down, covers photovoltaic board 11.
This waterproof photovoltaic tile utilizes flip 2 to articulate on tile 1, covers photovoltaic board 11 when flip 2 turns down, reaches waterproof effect, improves water-proof effects, avoids rainy weather photovoltaic board 11 to expose outside and wet. Through the matching use of the balancing weight 41 and the water storage tank 42, in a sunny day, the balancing weight 41 sinks to drive the shaft lever 3 to rotate, and the shaft lever 3 drives the turnover cover 2 to turn upwards. In rainy days, the weight of the water storage tank 41 is increased and sunk, and the flip cover 2 is driven to be turned down, so that the flip cover 2 is controlled to rotate.
A U-shaped pipe 43 is arranged in the water storage tank 42, an iron sheet 44 is arranged at the bottom of the inner wall of the water storage tank 42, the water outlet end of the U-shaped pipe 43 penetrates through the water storage tank 42 and extends to the lower part of the water storage tank 42, and the water inlet of the water storage tank 42 has a trend of always facing upwards through the iron sheet 44. The U-shaped pipe 43 is inserted into the reservoir 42.
Because the water storage tank 42 is pivoted on the movable plate 4, the iron sheet 44 is arranged in the water storage tank 42, so that the water inlet of the water storage tank 42 is always upward. When the liquid level in the water storage tank 42 is higher than the U-shaped pipe 43 along with the continuous flowing of the rainwater into the water storage tank 42, a siphon effect is formed, and the rainwater in the water storage tank 42 is continuously discharged from the water outlet of the U-shaped pipe 43.
The water inlet of the water storage tank 42 is larger than the water outlet, so that the water inlet speed of the water storage tank 42 is higher than the water outlet speed in rainy days, and the total weight of the water storage tank 42 is always larger than the total weight of the balancing weight 41 and the turnover cover 2 in rainy days. The water storage tank 42 is prevented from being lightened due to the fact that the water storage tank 42 is too fast in water outlet speed and rains. When the rain stops, the water in the water storage tank 42 is gradually discharged, and the weight is reduced, so that the water storage tank 42 is tilted.
The tile 1 further comprises a waterproof plate 12 and a drain hole 14, the waterproof plate 12 is inserted into the groove 15, the waterproof plate 12 is located above the photovoltaic plate 11, the drain hole 14 is formed in one side, close to the photovoltaic plate 11, of the tile 1, and the drain hole 14 is located above the waterproof plate 12. The waterproof board 12 is used for preventing rainwater from contacting the photovoltaic board 11, a waterproof effect is achieved, and rainwater entering the groove 15 before the flip cover 2 is turned down is drained through the drain hole 14. The waterproof sheet 12 is made of transparent plastic
The flip cover 2 is provided with a rib 21 relative to the groove 15, and the rib 21 is inserted into the groove 15 when the flip cover 2 is turned down, so that the sealing performance of the flip cover 2 when turned down is improved. The flap 2 and the collar 21 are made of a lightweight plastic.
By arranging the U-shaped pipe 43 in the water storage tank 42, when the liquid level in the water storage tank 42 is higher than the U-shaped pipe 43, a siphon effect is formed, and water in the water storage tank 42 flows out along the U-shaped pipe 43 to play a role of draining. After the weather turns fine, the rainwater in the water storage tank 42 is automatically discharged, and the flip cover 2 is turned upwards again. The tile 1 is provided with the drain hole 14, so that rainwater entering the groove 15 without turning down the flip cover 2 is drained along with the drain hole 14, and the rainwater is prevented from being accumulated in the tile 1.
The working principle is as follows: when the rainwater storage tank is used, rainwater continuously enters the water storage tank 42 in rainy days, the weight of the water storage tank 42 is continuously increased, and the balancing weight 41 is lifted, so that the shaft lever 3 drives the turnover cover 2 to turn down to block the groove 15, and the rainwater is prevented from entering. Rainwater entering the groove 15 before the flip 2 is turned down is blocked by the waterproof sheet 12 and flows out through the drain hole 14.
To sum up, this waterproof photovoltaic tile utilizes flip 2 to articulate on tile 1, covers photovoltaic board 11 when flip 2 turns down, reaches waterproof effect, improves water-proof effects, avoids rainy weather photovoltaic board 11 to expose outside and wet. Through the matching use of the balancing weight 41 and the water storage tank 42, in a sunny day, the balancing weight 41 sinks to drive the shaft lever 3 to rotate, and the shaft lever 3 drives the turnover cover 2 to turn upwards. In rainy days, the weight of the water storage tank 41 is increased and sunk, and the flip cover 2 is driven to be turned down, so that the flip cover 2 is controlled to rotate.
Furthermore, by providing the U-shaped pipe 43 in the reservoir 42, a siphon effect is formed when the liquid level in the reservoir 42 is higher than the U-shaped pipe 43, and the water in the reservoir 42 flows out along the U-shaped pipe 43, thereby performing a drainage function. After the weather turns fine, the rainwater in the water storage tank 42 is automatically discharged, and the flip cover 2 is turned upwards again. The tile 1 is provided with the drain hole 14, so that rainwater entering the groove 15 without turning down the flip cover 2 is drained along with the drain hole 14, and the rainwater is prevented from being accumulated in the tile 1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A waterproof photovoltaic tile which characterized in that: the photovoltaic solar energy storage tile comprises a tile (1), a photovoltaic panel (11) and a turnover cover (2) hinged to the tile (1), wherein shaft levers (3) are arranged on the front side and the rear side of the turnover cover (2) in an axisymmetric mode, a groove (15) is formed in the tile (1), the photovoltaic panel (11) is installed in the groove (15), the turnover cover (2) is connected with a movable plate (4) through the shaft levers (3), a balancing weight (41) is installed at one end of the movable plate (4), a water storage box (42) is pivoted to the other end of the movable plate (4), and the turnover cover (2) is turned down when the water storage box (42) stores; a U-shaped pipe (43) is arranged in the water storage tank (42), an iron sheet (44) is installed at the bottom of the inner wall of the water storage tank (42), the water outlet end of the U-shaped pipe (43) penetrates through the water storage tank (42) and extends to the lower part of the water storage tank (42), and the water inlet of the water storage tank (42) has a trend of always facing upwards through the iron sheet (44); the tile (1) further comprises a waterproof plate (12), the waterproof plate (12) is inserted into the groove (15) in a plugging mode, the waterproof plate (12) is located above the photovoltaic plate (11), a drain hole (14) is formed in one side, close to the photovoltaic plate (11), of the tile (1), and the drain hole (14) is located above the waterproof plate (12).
2. The waterproof photovoltaic tile of claim 1, wherein: the flip cover (2) is provided with a flange (21) relative to the groove (15), and the flange (21) is inserted into the groove (15) when the flip cover (2) is turned down.
3. The waterproof photovoltaic tile of claim 2, wherein: the waterproof plate (12) is made of transparent plastic.
4. The waterproof photovoltaic tile of claim 3, wherein: the flap (2) and the rib (21) are made of light plastic.
5. The waterproof photovoltaic tile of claim 4, wherein: the movable plate (4) is made of an EVA waterproof plate.
CN202010242912.5A 2020-03-31 2020-03-31 Waterproof photovoltaic tile Withdrawn CN111424886A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010242912.5A CN111424886A (en) 2020-03-31 2020-03-31 Waterproof photovoltaic tile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010242912.5A CN111424886A (en) 2020-03-31 2020-03-31 Waterproof photovoltaic tile

Publications (1)

Publication Number Publication Date
CN111424886A true CN111424886A (en) 2020-07-17

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CN202010242912.5A Withdrawn CN111424886A (en) 2020-03-31 2020-03-31 Waterproof photovoltaic tile

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112254358A (en) * 2020-10-22 2021-01-22 湖南秉俊能源科技有限公司 Rust-proof solar water heater

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2742035Y (en) * 2004-11-12 2005-11-23 杨家成 Automatic water drain type inspection manhole cover
CN109138047A (en) * 2018-09-08 2019-01-04 芜湖市高科电子有限公司 A kind of intelligent villa rainwater recovery device that can be picked up rainwater and be re-used
CN109548633A (en) * 2019-02-15 2019-04-02 雍西映 A kind of gravity drive is without stable state energy conservation and environmental protection automatic irrigation device and operating method
US20190226211A1 (en) * 2016-04-07 2019-07-25 Shih Hsiang WU Functional Roof Construction Method and Arrangement
CN110120779A (en) * 2019-06-20 2019-08-13 张雪飘 A kind of solar energy photovoltaic generator
CN209837480U (en) * 2019-04-15 2019-12-24 苏州波粒新能源科技有限公司 Thermal-insulated rain-proof photovoltaic tile

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2742035Y (en) * 2004-11-12 2005-11-23 杨家成 Automatic water drain type inspection manhole cover
US20190226211A1 (en) * 2016-04-07 2019-07-25 Shih Hsiang WU Functional Roof Construction Method and Arrangement
CN109138047A (en) * 2018-09-08 2019-01-04 芜湖市高科电子有限公司 A kind of intelligent villa rainwater recovery device that can be picked up rainwater and be re-used
CN109548633A (en) * 2019-02-15 2019-04-02 雍西映 A kind of gravity drive is without stable state energy conservation and environmental protection automatic irrigation device and operating method
CN209837480U (en) * 2019-04-15 2019-12-24 苏州波粒新能源科技有限公司 Thermal-insulated rain-proof photovoltaic tile
CN110120779A (en) * 2019-06-20 2019-08-13 张雪飘 A kind of solar energy photovoltaic generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112254358A (en) * 2020-10-22 2021-01-22 湖南秉俊能源科技有限公司 Rust-proof solar water heater

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Application publication date: 20200717