CN209488517U - Solar bracket for timing automatic cleaning solar panels - Google Patents

Solar bracket for timing automatic cleaning solar panels Download PDF

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Publication number
CN209488517U
CN209488517U CN201920431417.1U CN201920431417U CN209488517U CN 209488517 U CN209488517 U CN 209488517U CN 201920431417 U CN201920431417 U CN 201920431417U CN 209488517 U CN209488517 U CN 209488517U
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CN
China
Prior art keywords
mounting plate
solar panels
shaft
solar
fixed
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.)
Expired - Fee Related
Application number
CN201920431417.1U
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Chinese (zh)
Inventor
杨聚周
荣文清
刘红
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.)
Luan Boyang Solar Power Engineering Co Ltd
Original Assignee
Luan Boyang Solar Power Engineering Co Ltd
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
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Priority to CN201920431417.1U priority Critical patent/CN209488517U/en
Application granted granted Critical
Publication of CN209488517U publication Critical patent/CN209488517U/en
Expired - Fee Related legal-status Critical Current
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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
    • Y02E10/50Photovoltaic [PV] energy

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  • Photovoltaic Devices (AREA)

Abstract

The utility model discloses the solar bracket for timing automatic cleaning solar panels, including the supporting frame for installing solar panels, for solar panels to be carried out with the cleaning agency of dust cleaning, driving mechanism for driving cleaning agency to run, the supporting frame includes pedestal, support column, mounting plate, pedestal can be horizontally installed on ground by the way that fastening bolt is detachable, support column is vertically arranged to pedestal upper surface, mounting plate is rectangular panel body structure, and the top of support column is fixed in mounting plate inclination, and the extending direction that mounting plate is parallel to ground is its transverse direction, with ground at inclined extending direction for longitudinally, the solar panels are fixed on the middle position of mounting plate, cleaning agency includes a dedusting component, secondary plastering component, and secondary plastering structure longitudinally and is from top to bottom followed successively by along mounting plate Part, a dedusting component.

Description

Solar bracket for timing automatic cleaning solar panels
Technical field
The utility model relates to photovoltaic apparatus fields, and in particular to a kind of fixed bracket of solar panels.
Background technique
With the development of clean energy resource, solar energy is widely applied, solar street light, solar power generation, the field hydrology Water conservancy information gathering point etc. is related to ten million solar panels, and since solar panels are placed in field for a long time, surface is easy accumulation Dust is not easy to rinse well rainy, and the dust of accumulation declines the generated output of solar panels, seriously affects solar energy The normal use of plate, general low level placement location solar panels can also be put by manually periodically being cleaned but being expended energy Pinnacled solar panels are set, needs to climb by ladder and be cleaned, expend a large amount of manpower without material resources, especially to some open countries It is outer, need to provide water conservancy hydrological information collection point, the mountain flood information gathering point of power supply by solar energy, be distributed in each Rural small towns, it is far away, when solar panels need to clean due to the accumulation of dust, a large amount of manpower and material resources are even more expended, This makes a kind of ideal choice of technology of the solar panels dust automatic cleaning device as large-scale promotion application.
Summary of the invention
To solve the deficiencies in the prior art, it the purpose of the utility model is to provide a kind of fixed bracket of solar panels, adopts Dedusting, dedusting better effect are carried out to solar panels surface with preliminary cleaning dedusting, secondary wiping dedusting mode.
To realize the above-mentioned technical purpose, technical solution used by the utility model is as follows:
For the solar bracket of timing automatic cleaning solar panels, including for installing solar panels supporting frame, Cleaning agency for solar panels to be carried out with dust cleaning, the driving mechanism for driving cleaning agency to run;
The supporting frame includes pedestal, support column, mounting plate, and pedestal can pass through fastening bolt detachable water safety Loaded on ground, support column is vertically arranged to pedestal upper surface, and mounting plate is rectangular panel body structure, and mounting plate inclination is fixed on The top of support column, and mounting plate is parallel to the extending direction on ground and is it laterally and ground at inclined extending direction is Longitudinal, the solar panels are fixed on the middle position of mounting plate;
The driving mechanism includes driving motor, shaft, V belt translation component, and shaft is axially parallel to the cross of mounting plate To being provided with support frame between shaft and mounting plate, support frame is fixed on mounting plate, and shaft is movably installed on support frame simultaneously It can axially be rotated around itself, shaft is provided with two groups and is located at mounting plate along itself longitudinal one end;
The V belt translation component includes driving pulley, driven pulley, synchronous belt, and driving pulley is fixed on outside one group of shaft Portion, driven pulley are fixed on outside another group of shaft, are attached transmission by synchronous belt between driving pulley and driven pulley;
The driving motor output shaft is axially parallel to mounting plate transverse direction, and driving motor is fixed on support frame, and two It is provided with shaft coupling between any one group of shaft and driving motor power output end in group shaft, and passes through shaft coupling between the two Device is connected by power, and driving motor runs and draws synchronous belt and moves synchronously;
The V belt translation component is provided with two groups and is respectively arranged in one end of shaft;
The cleaning agency is set between two groups of synchronous belts, and cleaning agency is longitudinal and remote along itself close to mounting plate One end from the ground, cleaning agency include a dedusting component, secondary plastering component, and it is longitudinal along mounting plate and from top to bottom according to Secondary is secondary plastering component, a dedusting component;
Dedusting component includes synchronization blocks one, and one extending direction of synchronization blocks is parallel to the transverse direction of mounting plate, together It is provided with connecting rod one between step block one and synchronous belt, and is fixedly connected between the two by connecting rod one, and connect Bar one is correspondingly arranged on two groups;
The bottom of the synchronization blocks one, which is provided with, to be fabricated from a flexible material and for tentatively being cleaned to solar panels The brush sweeper of dust;
The secondary plastering component includes synchronization blocks two, and two extending direction of synchronization blocks is parallel to the transverse direction of mounting plate, together It is provided with connecting rod two between step block two and synchronous belt, and is fixedly connected between the two by connecting rod two, and connect Bar two is correspondingly arranged on two groups;
The bottom of the synchronization blocks two is provided with the wiping sponge for solar panels to be carried out with secondary wiping dust.
As further improvement of the utility model.
It is provided with the gear ash protrusion being fabricated from a flexible material on the mounting plate, keeps off ash protrusion close to mounting plate along itself One end longitudinal and close to ground, and keep off ash protrusion and mounting plate horizontal array is provided with several groups;
The bottom of the synchronization blocks two is provided with conflict slot, contradicts slot and is divided into two sections along itself groove depth direction and is respectively Changeover portion close to notch, the accommodating section close to slot bottom, and accommodating section size is greater than changeover portion size, be provided in accommodating section to Touch panel and the between the two cooperation of composition slide-and-guide, the bottom for contradicting plate is provided with connecting plate and the free end of connecting plate passed through It crosses Duan Bingyu wiping sponge to be fixedly connected, array is gone back between conflict plate and conflict slot slot bottom and is provided with several groups conflict spring, is supported The elastic force of touching spring makes to contradict the movement that plate does close mounting plate.
As further improvement of the utility model.
The adjustment mechanism of adjustable solar panels lighting angle is additionally provided on the supporting frame;
The support column is movably installed on pedestal and can axially rotate around itself, and the adjustment mechanism includes adjustment Motor, driving gear, driven gear, adjustment motor is fixed on base exterior and it is axially perpendicular to ground, and driving gear is fixed Outside the power output end of adjustment motor, driven gear is fixed on outside support column, and driving gear is engaged with driven gear;
The housing protected for each part to adjustment mechanism is additionally provided on the pedestal.
The beneficial effect of the utility model compared with prior art is that the utility model cleans dedusting, secondary using preliminary It wipes dedusting mode and dedusting, dedusting better effect is carried out to solar panels surface, while the setting for keeping off grey protrusion can remove clearly The dust adhered on brooming brush and wiping sponge, during avoiding cleaning agency from restoring to the original state, which is come back to Solar panels surface, so that removal dust is more thorough, in addition to this, the setting of adjustment mechanism can change the light of solar panels Irradiation angle, effectively preventing cleaning agency influences solar panels work.
Detailed description of the invention
In order to illustrate more clearly of the utility model embodiment, letter will be done to attached drawing needed in the embodiment below Single introduction, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention, general for this field For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the structural schematic diagram of the adjustment mechanism of the utility model.
Fig. 3 is the structural schematic diagram of the mounting plate of the utility model.
Fig. 4 is the structural schematic diagram of the cleaning agency of the utility model.
Fig. 5 is the cross-sectional view of the secondary plastering component of the utility model.
Fig. 6 is the structural schematic diagram of the driving mechanism of the utility model.
Each label meaning in figure are as follows:
10, supporting frame;11, pedestal;12, support column;13, mounting plate;14, gear ash protrusion;
20, driving mechanism;21, driving motor;22, shaft;23, V belt translation component;
30, cleaning agency;31, synchronization blocks one;32, brush sweeper;33, connecting rod one;34, synchronization blocks two;35, wiping sea It is continuous;36, connecting rod two;37, spring is contradicted;
40, adjustment mechanism;41, motor is adjusted;42, driving gear;43, driven gear.
Specific embodiment
Below with reference to the attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than all implements Example.Based on the embodiments of the present invention, those of ordinary skill in the art without making creative work, are obtained The every other embodiment obtained, belongs to scope of protection of the utility model.
As shown in figures 1 to 6, the solar bracket for timing automatic cleaning solar panels, including for installing solar panels Supporting frame 10, for solar panels carry out dust cleaning cleaning agency 30, for drive cleaning agency 30 run Driving mechanism 20.
As shown in Figure 1-3, the supporting frame 10 includes pedestal 11, support column 12, mounting plate 13, pedestal 11 can pass through Fastening bolt is detachable to be horizontally installed on ground, and support column 12 is vertically arranged to 11 upper surface of pedestal, and mounting plate 13 is square Shape plate body structure, and mounting plate 13 tilts the top for being fixed on support column 12, and mounting plate 13 is parallel to the extension side on ground Xiang Weiqi laterally and ground at inclined extending direction be it is longitudinal, the solar panels are fixed on the interposition of mounting plate 13 Set place.
As a shown in Figure 6, the driving mechanism 20 includes driving motor 21, shaft 22, V belt translation component 23, shaft 22 It is axially parallel to the transverse direction of mounting plate 13, support frame is provided between shaft 22 and mounting plate 13, support frame is fixed on mounting plate On 13, shaft 22 is movably installed on support frame and can axially rotate around itself, and shaft 22 is provided with two groups and is located at Mounting plate 13 is along itself longitudinal one end.
The V belt translation component 23 includes driving pulley, driven pulley, synchronous belt, and driving pulley is fixed on one group of shaft Outside 22, driven pulley is fixed on outside another group of shaft 22, is connected between driving pulley and driven pulley by synchronous belt Connect transmission.
21 output shaft of driving motor is axially parallel to mounting plate 13 laterally, and driving motor 21 is fixed on support frame On, and shaft coupling, and two are provided between 21 power output end of any one group of shaft 22 and driving motor in two groups of shafts 22 It is connected by power between person by shaft coupling, driving motor 21 runs and draws synchronous belt and moves synchronously.
The V belt translation component 23 is provided with two groups and is respectively arranged in one end of shaft 22.
As shown in Fig. 1,4,6, the cleaning agency 30 is set between two groups of synchronous belts, and cleaning agency 30 is close to peace Along itself, one end longitudinal and far from ground, cleaning agency 30 include a dedusting component, secondary plastering component, and edge to loading board 13 Mounting plate 13 is longitudinal and is from top to bottom followed successively by secondary plastering component, a dedusting component.
Dedusting component includes synchronization blocks 1, and one 31 extending direction of synchronization blocks is parallel to the cross of mounting plate 13 To, connecting rod 1 is provided between synchronization blocks 1 and synchronous belt, and between the two pass through one 33 company of being fixed of connecting rod It connects, and connecting rod 1 is correspondingly arranged on two groups.
The bottom of the synchronization blocks 1, which is provided with, to be fabricated from a flexible material and for preliminary clear to solar panels progress Sweep up dust the brush sweeper of dirt.
The secondary plastering component includes synchronization blocks 2 34, and 2 34 extending direction of synchronization blocks is parallel to the cross of mounting plate 13 To, connecting rod 2 36 is provided between synchronization blocks 2 34 and synchronous belt, and between the two pass through 2 36 company of being fixed of connecting rod It connects, and connecting rod 2 36 is correspondingly arranged on two groups.
The bottom of the synchronization blocks 2 34 is provided with the wiping sponge for solar panels to be carried out with secondary wiping dust 35。
In actual work, the switching programme of driving motor 21 can be arranged in operator by controller, so that cleaning agency 30 timings carry out dust, dust process specific manifestation to solar panels surface automatically are as follows:
Driving motor 21 runs and draws synchronous belt along the longitudinal movement done close to ground of mounting plate 13, and synchronous belt moves simultaneously Draw a dedusting component, secondary plastering component moves synchronously, wherein dust progress of the brush sweeper 32 to solar panels surface It tentatively cleans and it is made to fall to ground, while wiping sponge 35 and secondary wiping dust processing is carried out to solar panels surface, make Dust better effect, while should during, since brush sweeper 32 is that flexible material is made with sponge 35 is wiped so that Solar panels are not suffered a loss;
After dust removes, 21 inverted running of driving motor can be such that cleaning agency 30 restores to original state.
Preferably, in 30 cleaning process of cleaning agency, it can be infected with part dust on brush sweeper 32 and wiping sponge 35, it should Part dust can turn again to solar panels surface during the recovery of cleaning agency 30 to original state, so that dust removal is not thorough Bottom is provided with the gear ash protrusion 14 being fabricated from a flexible material, keeps off ash protrusion in order to solve this problem on the mounting plate 13 14 close to mounting plate 13 one end longitudinal along itself and close to ground, and keep off ash protrusion 14 and be provided with along 13 horizontal array of mounting plate Several groups.
In 30 cleaning process of cleaning agency, continue to do close to ground after brush sweeper 32 and the wiping removal dust of sponge 35 It moves and is contacted with keeping off grey raised 14, when brush sweeper 32 passes through with wiping sponge 35 keeps off grey raised 14, keep off 14 meetings of grey protrusion Dust on brush sweeper 32 and wiping sponge 35 is removed, simultaneously because gear ash protrusion 14 is made of flexible material, so not Brush sweeper 32 and wiping sponge 35 can be caused to damage.
Preferably, the bottom of the synchronization blocks 2 34 is provided with conflict slot, contradicts slot along itself groove depth direction and is divided into two The changeover portion of section and respectively close notch, the accommodating section close to slot bottom, and accommodating section size is greater than changeover portion size, accommodating section Inside be provided with and contradict plate and constitute slide-and-guide cooperation between the two, contradict plate bottom be provided with connecting plate and connecting plate from By holding across changeover portion and being fixedly connected with wiping sponge 35, array is gone back between conflict plate and conflict slot slot bottom and is provided with several groups Spring 37 is contradicted, the elastic force for contradicting spring 37 makes to contradict the movement that plate does close mounting plate 13;Its significance lies in that contradicting spring 37 Elastic force make to wipe sponge 35 and more recline mounting plate 13, to make to wipe sponge 35 to the wiping effect on solar panels surface more It is good.
Preferably, due to the presence of driving mechanism 20 and cleaning agency 30, Yanguan Pass can be blocked, makes the work of solar panels It is affected, in order to solve this problem, adjustable solar panels lighting angle is additionally provided on the supporting frame 10 Adjustment mechanism 40.
The support column 12 is movably installed on pedestal 11 and can axially rotate around itself, and the adjustment mechanism 40 wraps Adjustment motor 41, driving gear 42, driven gear 43 are included, adjustment motor 41 is fixed on 11 outside of pedestal and it is axially perpendicular to ground Face, driving gear 42 are fixed on outside the power output end of adjustment motor 41, and driven gear 43 is fixed on outside support column 12, main Moving gear 42 is engaged with driven gear 43.
The housing protected for each part to adjustment mechanism 40 is additionally provided on the pedestal 11.
Adjustment motor 41 runs and by driving gear 42, driven gear 43 support column 12 is rotated, and 12 turns of support column Move and change the lighting angle of solar panels;
The opening and closing of adjustment motor 41 can be arranged in user according to practical topography and seasonal variations and by controller simultaneously Program makes the lighting angle of 40 timing adjust automatically solar panels of adjustment mechanism.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new Type;Various modifications to these embodiments will be readily apparent to those skilled in the art, the utility model Defined in General Principle can be in the case where not departing from the spirit or scope of the utility model, in other embodiments It realizes.Therefore, the utility model will not be defined to the embodiments shown herein, and be to fit to it is disclosed herein Principle and the consistent widest scope of features of novelty.

Claims (9)

1. being used for the solar bracket of timing automatic cleaning solar panels, which is characterized in that it includes for installing solar panels Supporting frame, for solar panels carry out dust cleaning cleaning agency, for drive cleaning agency run driving machine Structure;
The supporting frame includes pedestal, support column, mounting plate, and pedestal can be horizontally installed to by the way that fastening bolt is detachable On ground, support column is vertically arranged to pedestal upper surface, and mounting plate is rectangular panel body structure, and support is fixed in mounting plate inclination The top of column, and mounting plate be parallel to ground extending direction be its laterally and ground at inclined extending direction be it is longitudinal, The solar panels are fixed on the middle position of mounting plate;
The driving mechanism includes driving motor, shaft, V belt translation component, and shaft is axially parallel to the transverse direction of mounting plate, is turned Support frame is provided between axis and mounting plate, support frame is fixed on mounting plate, and shaft is movably installed on support frame and can be around Itself is axially rotated, and shaft is provided with two groups and is located at mounting plate along itself longitudinal one end;
The V belt translation component includes driving pulley, driven pulley, synchronous belt, and driving pulley is fixed on outside one group of shaft, Driven pulley is fixed on outside another group of shaft, is attached transmission by synchronous belt between driving pulley and driven pulley;
The driving motor output shaft is axially parallel to mounting plate transverse direction, and driving motor is fixed on support frame, and two groups turn Be provided with shaft coupling between any one group of shaft and driving motor power output end in axis, and between the two by shaft coupling into Action edge connection, driving motor run and draw synchronous belt and move synchronously.
2. the solar bracket according to claim 1 for timing automatic cleaning solar panels, which is characterized in that described V belt translation component be provided with two groups and be respectively arranged in one end of shaft.
3. the solar bracket according to claim 2 for timing automatic cleaning solar panels, which is characterized in that described Cleaning agency be set between two groups of synchronous belts, and cleaning agency is longitudinal along itself close to mounting plate and far from ground one End, cleaning agency includes a dedusting component, secondary plastering component, and longitudinally and is from top to bottom followed successively by secondary smear along mounting plate Grey component, a dedusting component.
4. the solar bracket according to claim 3 for timing automatic cleaning solar panels, which is characterized in that described A dedusting component include synchronization blocks one, one extending direction of synchronization blocks is parallel to the transverse direction of mounting plate, synchronization blocks one with it is synchronous It is provided with connecting rod one between band, and is fixedly connected between the two by connecting rod one, and connecting rod one is correspondingly arranged There are two groups;
The secondary plastering component includes synchronization blocks two, and two extending direction of synchronization blocks is parallel to the transverse direction of mounting plate, synchronization blocks It is provided with connecting rod two between two and synchronous belt, and is fixedly connected between the two by connecting rod two, and connecting rod two It is correspondingly arranged on two groups.
5. the solar bracket according to claim 4 for timing automatic cleaning solar panels, which is characterized in that described The bottoms of synchronization blocks one be provided with and be fabricated from a flexible material and for carrying out the preliminary cleaning hair for cleaning dust to solar panels Brush;
The bottom of the synchronization blocks two is provided with the wiping sponge for solar panels to be carried out with secondary wiping dust.
6. the solar bracket according to claim 5 for timing automatic cleaning solar panels, which is characterized in that described Mounting plate on be provided with the gear ash protrusion being fabricated from a flexible material, it is longitudinal along itself close to mounting plate and closely to keep off ash protrusion The one end in face, and keep off ash protrusion and mounting plate horizontal array is provided with several groups.
7. the solar bracket according to claim 6 for timing automatic cleaning solar panels, which is characterized in that described The bottoms of synchronization blocks two be provided with conflict slot, contradict slot and be divided into two sections along itself groove depth direction and be respectively the mistake close to notch Cross section, the accommodating section close to slot bottom, and accommodating section size is greater than changeover portion size, be provided in accommodating section contradict plate and the two it Between constitute slide-and-guide cooperation, contradict plate bottom be provided with connecting plate and connecting plate free end pass through changeover portion and with wiping Sponge is fixedly connected, and array is gone back between conflict plate and conflict slot slot bottom and is provided with several groups conflict spring, contradicts the elastic force of spring Make to contradict the movement that plate does close mounting plate.
8. the solar bracket according to claim 6 or 7 for timing automatic cleaning solar panels, which is characterized in that The adjustment mechanism of adjustable solar panels lighting angle is additionally provided on the supporting frame;
The support column is movably installed on pedestal and can axially rotate around itself, and the adjustment mechanism includes adjustment electricity Machine, driving gear, driven gear, adjustment motor is fixed on base exterior and it is axially perpendicular to ground, and driving gear is fixed on Outside the power output end for adjusting motor, driven gear is fixed on outside support column, and driving gear is engaged with driven gear.
9. the solar bracket according to claim 8 for timing automatic cleaning solar panels, which is characterized in that described Pedestal on be additionally provided with the housing protected for each part to adjustment mechanism.
CN201920431417.1U 2019-04-01 2019-04-01 Solar bracket for timing automatic cleaning solar panels Expired - Fee Related CN209488517U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920431417.1U CN209488517U (en) 2019-04-01 2019-04-01 Solar bracket for timing automatic cleaning solar panels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920431417.1U CN209488517U (en) 2019-04-01 2019-04-01 Solar bracket for timing automatic cleaning solar panels

Publications (1)

Publication Number Publication Date
CN209488517U true CN209488517U (en) 2019-10-11

Family

ID=68134870

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920431417.1U Expired - Fee Related CN209488517U (en) 2019-04-01 2019-04-01 Solar bracket for timing automatic cleaning solar panels

Country Status (1)

Country Link
CN (1) CN209488517U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113328693A (en) * 2021-07-01 2021-08-31 王朦茜 Solar panel device with cleaning function
CN114938195A (en) * 2022-05-30 2022-08-23 扬州大学 Self-cleaning perovskite solar cell

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113328693A (en) * 2021-07-01 2021-08-31 王朦茜 Solar panel device with cleaning function
CN113328693B (en) * 2021-07-01 2021-11-30 张掖吉电新能源有限公司 Solar panel device with cleaning function
CN114938195A (en) * 2022-05-30 2022-08-23 扬州大学 Self-cleaning perovskite solar cell

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Granted publication date: 20191011