CN210828578U - Photovoltaic multifunctional tent - Google Patents
Photovoltaic multifunctional tent Download PDFInfo
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- CN210828578U CN210828578U CN201921014012.4U CN201921014012U CN210828578U CN 210828578 U CN210828578 U CN 210828578U CN 201921014012 U CN201921014012 U CN 201921014012U CN 210828578 U CN210828578 U CN 210828578U
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- solar cell
- tent
- cell panel
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- crystalline silicon
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model relates to a photovoltaic multifunctional tent, including tent body, solar module, battery, luminosity detection subassembly, solar module includes brilliant silicon solar cell panel and thin-film solar cell panel, and brilliant silicon solar cell panel can overturn from top to bottom along with the relative tent body of support, and when closed, thin-film solar cell panel is covered, and when overturning, thin-film solar cell panel exposes; specifically, the motor rotates and drives the crystalline silicon solar cell panel to overturn relative to the tent body, and the motor is electrically connected with the storage battery and is powered by the storage battery. The utility model discloses a multi-functional tent of photovoltaic is brilliant silicon solar cell panel outward, and interior be thin-film solar cell panel, when weather is fine day, utilizes brilliant silicon solar cell panel to carry out photoelectric conversion, and when being cloudy day, the motor drives the upset of brilliant silicon solar cell panel, arranges thin-film solar cell panel in the outside, carries out photoelectric conversion. Different photoelectric conversion modules can be used in different environments.
Description
Technical Field
The utility model relates to a multi-functional tent of photovoltaic belongs to the multi-functional tent technical field of photovoltaic.
Background
Along with the continuous improvement of people's standard of living, people focus on the quality of life more and more, and outdoor activities receive liking of more and more urban residents, and the increase of open-air camping activities makes the demand of tent constantly increase. Except meeting the requirement of amateur field activities of people, the tent is an indispensable daily article when large-scale natural disasters occur, is convenient to build and assemble, and can provide safe temporary residences and living needs for disaster-stricken people. The increasing use demands of people also lead to the fact that the tent is required to be more comfortable and provide additional functions besides the original functions, for example, the tent can provide necessary power in the field or before the power grid damage is repaired, so that solar photovoltaic tents capable of providing temporary living and power supply are increasingly developed and produced.
However, the solar photovoltaic tent in the prior art has the following disadvantages:
first, the power supply mode is too single, such as publication number CN207609242U, the chinese utility model patent named "solar photovoltaic tent", only has flexible component and battery power supply, and thus can lead to the tent to guarantee the power supply efficiency under adverse circumstances.
Secondly, for current photovoltaic tent, lighting system is too single, and is too extravagant the power under the dim light environment.
Thirdly, the existing tent has too single function, and can not meet the requirements of people.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model aims at providing a multi-functional tent of photovoltaic has brilliant silicon solar cell panel and thin-film solar cell panel, can use different photoelectric conversion subassemblies under the environment of difference.
In order to achieve the technical purpose, the utility model adopts the following technical scheme.
A photovoltaic multifunctional tent comprises a tent body, wherein the tent body comprises tent cloth and a supporting rod for supporting the tent cloth, and further comprises a solar cell module and a luminosity detection module which are arranged outside the tent body, and a storage battery, an inverter and a lighting lamp which are arranged in the tent;
the utility model discloses a photovoltaic multifunctional tent, specifically, solar module and battery are connected, and solar module carries out photoelectric conversion, supplies with the battery storage, and the battery connects the dc-to-ac converter, reconnects light, luminosity detection subassembly, for light and luminosity detection subassembly power supply;
the utility model discloses a multi-functional tent of photovoltaic, it is concrete, solar module includes brilliant silicon solar cell panel and thin-film solar cell panel, brilliant silicon solar cell panel swing joint is on the outside bracing piece of tent body, the relative tent body overturns from top to bottom, thin-film solar cell panel sets up in the tent body outsidely, it is concrete, the setting is under brilliant silicon solar cell panel, when the relative tent body of brilliant silicon solar cell panel is closed, thin-film solar cell panel is covered, when the relative tent body of brilliant silicon panel outwards overturns, thin-film solar cell panel exposes.
Further, the utility model discloses a multi-functional tent of photovoltaic, crystalline silicon solar cell panel are fixed on the tent body through the pivot, the output shaft fixed connection of pivot and motor, and the motor rotates and drives the relative tent body upset of crystalline silicon solar cell panel. The motor is connected with the storage battery and the inverter, and the storage battery supplies power.
Further, the utility model discloses a multi-functional tent of photovoltaic, crystalline silicon solar cell panel and thin-film solar cell panel are flexible or modularization, convenient dismantlement and folding.
Specifically, the utility model discloses a multi-functional tent of photovoltaic, a plurality of bracing piece intervals set up for support tent. Furthermore, the bracing piece is collapsible branch, including bottom branch, middle part branch and top branch, is connected through the pivot respectively between middle part branch and bottom branch and the top branch, can revolute the rotation of axes, realizes folding.
Further, the utility model discloses a multi-functional tent of photovoltaic is provided with two-layer mount on the middle part branch, and the inlayer mount is used for fixed thin-film solar cell panel, and outer mount is used for fixed brilliant silicon solar cell panel. Specifically, the two fixing frames form an angle with each other in the horizontal direction, and are respectively matched with the adjacent supporting rods to fix the two ends of the crystalline silicon solar cell panel and the two ends of the thin film solar cell panel. Taking four supporting rods to support the tent cloth as an example, the angle between two fixing frames is 90 degrees, and the two fixing frames are respectively matched with the fixing frames of the adjacent supporting rods to fix the crystalline silicon solar cell panel and the thin film solar cell panel.
As a specific scheme, screw holes are respectively formed in two sides of the crystalline silicon solar panel and are respectively connected with crystalline silicon supports arranged on two sides of the crystalline silicon solar panel in a threaded mode. The crystal silicon support is fixed outside the tent body, preferably, and then fixed with an outer fixing frame of the supporting rod. Specifically, fixed through pivot and outer mount, the motor drives the pivot and rotates to realize the upset and the closure of the relative tent body of brilliant silicon solar cell panel.
The thin-film solar cell panel is similar to the crystalline silicon solar cell panel, screw holes are formed in two sides of the thin-film solar cell panel respectively, screw holes are also formed in the thin-film supports arranged on two sides of the thin-film solar cell panel respectively, and the thin-film solar cell panel is in threaded connection with the thin-film supports. The film bracket is fixed outside the tent body, preferably, fixed with the inner fixing frame of the supporting rod. Specifically, a method of screw-fastening may be employed.
Further, the utility model discloses a multi-functional tent of photovoltaic, the panel support is fixed on the tent body through the pivot, the output shaft fixed connection of pivot and motor, the motor rotates and drives the relative tent body upset of panel support. The motor is connected with the storage battery and the inverter, and the storage battery supplies power.
Further, the utility model discloses a multi-functional tent of photovoltaic, in order to avoid overcast and rainy weather, the battery setting is inside the tent body.
Specifically, the utility model discloses a multi-functional tent of photovoltaic, luminosity detection subassembly include flame luminosity FPD detector and control circuit. Preferably, it is an Agilent enhanced version flame photometric detector (FPD +).
Further, the utility model discloses a multi-functional tent of photovoltaic, the outside long afterglow material coating of tent body, it is concrete, the outside solar cell panel of tent body is to the position outside, the coating long afterglow material coating, and is preferred, and the coating of long afterglow material coating is at the outside top of tent body. The long-afterglow material coating absorbs light in the daytime and emits light at night to provide light for the thin-film solar cell panel for photoelectric conversion, and the problem that the tent cannot supply power at night is solved.
Further, the utility model discloses a multi-functional tent of photovoltaic, this internal lighting device that is provided with of tent, lighting device are the light, and light and battery electricity are connected for provide the illumination for the tent.
Further, the utility model discloses a multi-functional tent of photovoltaic, this internal USB interface that is provided with of tent, USB interface step-down module are connected, and step-down module reconnection battery, USB's setting can improve the practicality of tent greatly.
Further, the utility model discloses a multi-functional tent of photovoltaic still includes the controller, and is optional, and the controller adopts MPPT intelligence solar charging controller. The controller is respectively connected with the solar cell module and the storage battery.
The utility model discloses a multi-functional tent of photovoltaic, its working process is: the photovoltaic controller controls the crystalline silicon solar panel and the thin-film solar panel to supply power to the storage battery, then the storage battery supplies power to the illuminating lamp and the motor through the inverter, and the storage battery supplies power to the USB interface through the voltage reduction module. The illumination detector detects the environment in cloudy days or at night, and controls the driving motor to drive the crystalline silicon solar cell panel to turn over, expose the thin-film solar cell panel and change the power supply mode. The afterglow material emits light at the same time, the thin film solar cell performs photoelectric conversion, electric energy is supplied to the storage battery, and then the storage battery supplies power to the load of the tent. The motor is controlled to turn over by the light detection circuit.
The utility model discloses a multi-functional tent of photovoltaic adopts last technical scheme, has following technological effect.
1. The utility model discloses a multi-functional tent of photovoltaic, including brilliant silicon solar cell panel and thin-film solar cell panel, brilliant silicon solar cell panel can overturn, when weather is fine day, utilizes brilliant silicon solar cell panel to carry out photoelectric conversion, when being cloudy day, the motor drives brilliant silicon solar cell panel and overturns, arranges thin-film solar cell panel in the outside, carries out photoelectric conversion, can freely overturn the change according to the environment of difference and get the electric mode.
2. The utility model discloses a multi-functional tent of photovoltaic, outside coating long afterglow material coating, extinction in daytime, night time is luminous just, supplies thin-film solar cell panel to carry out photoelectric conversion, has guaranteed the efficiency of power supply night.
3. The utility model discloses what adopt around the top of photovoltaic tent is that the support that can overturn constitutes, its structure is brilliant silicon solar cell panel, thin-film solar cell panel, and the panel is all flexible or modular, and convenient folding or dismantlement.
Drawings
Fig. 1 is a schematic structural view of a photovoltaic multifunctional tent of the present invention;
fig. 2 is a schematic structural view of another state of the photovoltaic multifunctional tent of the present invention;
fig. 3 is a schematic view of the internal structure of the photovoltaic multifunctional tent of the present invention;
FIG. 4 is a schematic block diagram of the present invention;
fig. 5 is an exploded schematic view of a crystalline silicon support and a crystalline silicon solar panel of the present invention;
fig. 6 is a schematic view of the support rod of the present invention in an extended state;
fig. 7 is a schematic view of the support rod of the present invention in a retracted state;
the figure includes: luminosity detection component 1, long afterglow material coating 2, crystalline silicon solar cell panel 3, motor 4, battery 5, thin-film solar cell panel 6, light 7, USB interface 8, controller 9, solar cell module 10, inverter 11, tent cloth 12, step-down module 13, load 14, bracing piece 15, crystalline silicon support 31, bottom branch 151, middle part branch 152, top branch 153, inlayer mount 154, outer mount 155.
Detailed Description
The technical solution of the present invention will be further described below with reference to the following detailed description and the accompanying drawings, so that those skilled in the art can better understand the present invention and can implement the same.
Referring to fig. 1 to 4, the utility model provides a photovoltaic multifunctional tent, which comprises a tent body, wherein the tent body comprises a tent cloth 12 and a supporting rod 15 for supporting the tent cloth 12, and further comprises a solar battery assembly 10 and a luminosity detection assembly 1 which are arranged outside the tent body, and a storage battery 5, an inverter 11 and a lighting lamp 7 which are arranged in the tent;
the utility model discloses a multi-functional tent of photovoltaic, specifically, solar module 10 and battery 5 are connected, and solar module 10 carries out photoelectric conversion, supplies with battery 5 storage, and battery 5 connects dc-to-ac converter 11, reconnects light 7, luminosity detection subassembly 1, supplies power for light 7 and luminosity detection subassembly 1;
the utility model discloses a multi-functional tent of photovoltaic, it is concrete, solar module 10 includes brilliant silicon solar cell panel 3 and thin-film solar cell panel 6, 3 swing joint of brilliant silicon solar cell panel is on the outside bracing piece 15 of tent body, can overturn from top to bottom the tent body relatively, thin-film solar cell panel 6 sets up in the tent body outsidely, it is concrete, the setting is under brilliant silicon solar cell panel 3, when the relative tent body of brilliant silicon solar cell panel 3 is closed, thin-film solar cell panel 6 is covered, when the relative tent body of brilliant silicon panel outwards overturns, thin-film solar cell panel 6 exposes.
Further, the utility model discloses a multi-functional tent of photovoltaic, crystalline silicon solar cell panel 3 are fixed on the tent body through the pivot, pivot and motor 4's output shaft fixed connection, and motor 4 rotates and drives the relative tent body upset of crystalline silicon solar cell panel 3. The motor 4 is connected to the battery 5 and the inverter 11, and is supplied with power from the battery 5.
Further, the utility model discloses a multi-functional tent of photovoltaic, crystalline silicon solar cell panel 3 and thin-film solar cell panel 6 are flexible or modular, convenient dismantlement and folding.
Referring to fig. 5 to 7, in particular, the photovoltaic multifunctional tent of the present invention has a plurality of supporting rods 15 arranged at intervals for supporting the tent. Furthermore, the supporting rod 15 is a foldable supporting rod, and includes a bottom supporting rod 151, a middle supporting rod 152 and a top supporting rod 153, and the middle supporting rod 152, the bottom supporting rod 151 and the top supporting rod 153 are connected through a rotating shaft, and can rotate around the rotating shaft to realize folding.
Referring to fig. 6, further, the utility model discloses a photovoltaic multifunctional tent is provided with two-layer mount on the middle part branch 152, and inlayer mount 154 is used for fixing thin-film solar cell panel 6, and outer mount 155 is used for fixing crystalline silicon solar cell panel 3. Specifically, the two fixing frames form an angle with each other in the horizontal direction, and are respectively matched with the adjacent supporting rods 15 to fix the two ends of the crystalline silicon solar cell panel 3 and the two ends of the thin film solar cell panel 6. Taking the case that the tent cloth 12 is supported by four supporting rods 15, the angle between two fixing frames is 90 degrees, and the four fixing frames are respectively matched with the fixing frames of the adjacent supporting rods 15 to fix the crystalline silicon solar cell panel 3 and the thin film solar cell panel 6.
Referring to fig. 5, as a specific scheme, two sides of the crystalline silicon solar panel 3 are respectively provided with screw holes, and the crystalline silicon solar panel 3 is in threaded connection with the crystalline silicon supports 31 arranged on two sides of the crystalline silicon solar panel. The crystal silicon bracket 31 is connected with the tent body, and preferably fixed with the outer fixing frame 155 of the support pole 15. Specifically, the rotating shaft and the outer fixing frame 155 are fixed, and the motor 4 drives the rotating shaft to rotate, so that the crystalline silicon solar panel 3 is turned over and closed relative to the tent body.
The thin-film solar cell panel 6 is similar to the crystalline silicon solar cell panel 3, screw holes are formed in two sides of the thin-film solar cell panel respectively, screw holes are also formed in the thin-film supports on two sides of the thin-film solar cell panel respectively, and the thin-film solar cell panel 6 is in threaded connection with the thin-film supports. The film frame is then secured to the tent body, preferably to the inner frame 154 of the pole 15. Specifically, a method of screw-fastening may be employed.
Further, the utility model discloses a multi-functional tent of photovoltaic, the panel support is fixed on the tent body through the pivot, pivot and motor 4's output shaft fixed connection, and motor 4 rotates and drives the relative tent body upset of panel support. The motor 4 is connected to the battery 5 and the inverter 11, and is supplied with power from the battery 5.
Further, the utility model discloses a multi-functional tent of photovoltaic, in order to avoid overcast and rainy weather, battery 5 sets up inside the tent body.
Specifically, the utility model discloses a multi-functional tent of photovoltaic, luminosity detection subassembly 1 includes flame luminosity FPD detector and control circuit. Preferably, it is an Agilent enhanced version flame photometric detector (FPD +).
Further, the utility model discloses a multi-functional tent of photovoltaic, tent body outside coating long afterglow material coating 2, it is concrete, position outside tent body outside solar cell panel to outside, coating long afterglow material coating 2, it is preferred, the coating of long afterglow material coating 2 is at the external top of tent. The long afterglow material coating 2 absorbs light in the daytime and emits light at night to provide light for the thin film solar cell panel 6 for photoelectric conversion, so that the problem that the tent cannot supply power at night is solved.
Further, the utility model discloses a multi-functional tent of photovoltaic, this internal lighting device that is provided with of tent, lighting device are light 7, and light 7 is connected with the 5 electricity of battery for provide the illumination for the tent.
Further, the utility model discloses a multi-functional tent of photovoltaic, this internal USB interface 8 that is provided with of tent, USB interface 8 step-down module 13 are connected, and step-down module 13 reconnection battery, USB's setting can improve the practicality of tent greatly.
Further, the utility model discloses a multi-functional tent of photovoltaic still includes controller 9, and is optional, and controller 9 adopts MPPT intelligence solar charging controller 9. The controller 9 is connected to the solar cell module 10 and the battery 5, respectively.
The utility model discloses a multi-functional tent of photovoltaic, its working process is: the photovoltaic controller 9 controls the crystalline silicon solar panel 3 and the thin-film solar panel 6 to supply power to the storage battery 5, then the storage battery 5 supplies power to the illuminating lamp 7 and the motor 4 through the inverter 11, and the storage battery 5 supplies power to the USB interface 8 through the voltage reduction module 13. The illumination detector detects the environment in cloudy days or at night, and controls the driving motor 4 to drive the crystalline silicon solar cell panel 3 to turn over, expose the thin-film solar cell panel 6 and change the power supply mode. Meanwhile, the afterglow material emits light, the thin film solar cell performs photoelectric conversion, electric energy is supplied to the storage battery 5, and then the storage battery 5 supplies power to the load 14 of the tent. The motor 4 is controlled to turn by the photo detection circuit.
The utility model provides a technical scheme does not receive the restriction of above-mentioned embodiment, all utilizes the utility model discloses a structure and mode are all in through the technical scheme that transform and substitution formed the utility model discloses a within the protection scope.
Claims (10)
1. The utility model provides a multi-functional tent of photovoltaic, includes the tent body, and the tent body includes tent cloth and the bracing piece that supports tent cloth, its characterized in that: the tent also comprises a solar cell module and a luminosity detection module which are arranged outside the tent body, and a storage battery, an inverter and an illuminating lamp which are arranged in the tent;
the solar battery assembly is connected with the storage battery, and the storage battery is connected with the inverter and then connected with the illuminating lamp and the luminosity detection assembly;
the solar cell module comprises a crystalline silicon solar cell panel and a thin-film solar cell panel, the crystalline silicon solar cell panel is movably connected to the supporting rod outside the tent body and can be turned over relative to the tent body, the thin-film solar cell panel is arranged below the crystalline silicon solar cell panel outside the tent body, when the crystalline silicon solar cell panel is closed relative to the tent body, the thin-film solar cell panel is covered, and when the crystalline silicon solar cell panel is turned over relative to the tent body outwards, the thin-film solar cell panel is exposed.
2. The photovoltaic multifunctional tent of claim 1, wherein: the crystalline silicon solar panel is fixed on the tent body through the rotating shaft, the rotating shaft is fixedly connected with an output shaft of the motor, the motor rotates to drive the crystalline silicon solar panel to overturn relative to the tent body, and the motor is connected with the storage battery and the inverter.
3. The photovoltaic multifunctional tent of claim 1, wherein: the crystalline silicon solar cell panel and the thin-film solar cell panel are both flexible or modularized.
4. The photovoltaic multifunctional tent of claim 1, wherein: the support rod is a foldable support rod and comprises a bottom support rod, a middle support rod and a top support rod, wherein the middle support rod, the bottom support rod and the top support rod are connected through a rotating shaft respectively and can rotate around the rotating shaft.
5. The photovoltaic multifunctional tent of claim 4, wherein: be provided with two-layer mount on the branch of middle part, the inlayer mount is used for fixed thin-film solar cell panel, and outer mount is used for fixed brilliant silicon solar cell panel, and the mount is two of mutual angulation in the horizontal direction, respectively with adjacent bracing piece cooperation, fixed brilliant silicon solar cell panel and thin-film solar cell panel's both ends.
6. The photovoltaic multifunctional tent of claim 5, wherein: the two sides of the crystalline silicon solar panel are respectively provided with a screw hole, the crystalline silicon solar panel and the crystalline silicon supports arranged on the two sides of the crystalline silicon solar panel are also respectively provided with screw holes, the crystalline silicon solar panel is in threaded connection with the crystalline silicon supports, and the crystalline silicon supports are fixed with the outer-layer fixing frame through the rotating shaft;
the two sides of the thin-film solar cell panel are respectively provided with a screw hole, the thin-film supports arranged on the two sides of the thin-film solar cell panel are also respectively provided with a screw hole, the thin-film solar cell panel is in threaded connection with the thin-film supports, and the thin-film supports are fixed with the inner-layer fixing frame of the supporting rod.
7. The photovoltaic multifunctional tent of claim 1, wherein: the photometric detection assembly includes a flame photometric FPD detector and a control circuit.
8. The photovoltaic multifunctional tent of claim 1, wherein: the exterior of the tent body is coated with long afterglow material paint.
9. The photovoltaic multifunctional tent of claim 1, wherein: this internal USB interface that is provided with of tent, USB interface and step-down module are connected, and the battery is connected to the step-down module.
10. The photovoltaic multifunctional tent of any one of claims 1 to 9, wherein: the solar energy storage system is characterized by further comprising a controller which is respectively connected with the solar cell module and the storage battery, and the controller is an MPPT intelligent solar charging controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921014012.4U CN210828578U (en) | 2019-07-02 | 2019-07-02 | Photovoltaic multifunctional tent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921014012.4U CN210828578U (en) | 2019-07-02 | 2019-07-02 | Photovoltaic multifunctional tent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210828578U true CN210828578U (en) | 2020-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921014012.4U Expired - Fee Related CN210828578U (en) | 2019-07-02 | 2019-07-02 | Photovoltaic multifunctional tent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210828578U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4039920A1 (en) * | 2021-02-08 | 2022-08-10 | Efraim Karagoz | Removable heating structure comprising a fabric |
| CN115136823A (en) * | 2022-07-04 | 2022-10-04 | 沧州米澜新能源科技有限公司 | Solar photovoltaic greenhouse and installation method thereof |
-
2019
- 2019-07-02 CN CN201921014012.4U patent/CN210828578U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4039920A1 (en) * | 2021-02-08 | 2022-08-10 | Efraim Karagoz | Removable heating structure comprising a fabric |
| CN115136823A (en) * | 2022-07-04 | 2022-10-04 | 沧州米澜新能源科技有限公司 | Solar photovoltaic greenhouse and installation method thereof |
| CN115136823B (en) * | 2022-07-04 | 2023-07-14 | 沧州米澜新能源科技有限公司 | Solar photovoltaic greenhouse and installation method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200623 Termination date: 20210702 |
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| CF01 | Termination of patent right due to non-payment of annual fee |