CN105546839A - Concrete-type butterfly solar concentrator and tracking device thereof - Google Patents
Concrete-type butterfly solar concentrator and tracking device thereof Download PDFInfo
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- CN105546839A CN105546839A CN201610090088.XA CN201610090088A CN105546839A CN 105546839 A CN105546839 A CN 105546839A CN 201610090088 A CN201610090088 A CN 201610090088A CN 105546839 A CN105546839 A CN 105546839A
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- draught line
- western
- traction unit
- reduction box
- concrete
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/82—Arrangements for concentrating solar-rays for solar heat collectors with reflectors characterised by the material or the construction of the reflector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/71—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with parabolic reflective surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S30/00—Arrangements for moving or orienting solar heat collector modules
- F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/20—Arrangements for controlling solar heat collectors for tracking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
- F24S2020/23—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants movable or adjustable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S30/00—Arrangements for moving or orienting solar heat collector modules
- F24S2030/10—Special components
- F24S2030/11—Driving means
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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
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mounting And Adjusting Of Optical Elements (AREA)
Abstract
The invention discloses a concrete-type butterfly solar concentrator and tracking device thereof. The concrete-type butterfly solar concentrator and tracking device thereof comprises a combined condenser, an east traction unit, a concrete support body, a west traction unit, a north traction unit and a south traction unit, wherein the combined condenser consists of a reflective aluminium foil, cement concrete, sliding positioning pins, steel bars, rolling wheels and transmission mounting connectors, and can slide in the concrete support body in a two-dimensional direction to track solar energy; the sliding positioning pins are in sliding fit with a sliding positioning groove to realize accurate tracking; the rolling wheels are matched with a sliding surface to realize rolling friction and reduce the tracking driving power; the east traction unit, the west traction unit, the north traction unit and the south traction unit realize automatic control in four directions so as to adjust the elevation angle and the azimuth angle of the combined condenser.
Description
Technical field
The present invention relates to a kind of concrete-type butterfly solar energy condenser lens and tracking means thereof, utilize concrete to make a kind of paraboloid of revolution, realize butterfly Salar light-gathering, belong to technical field of new energies.
Background technology
Solar energy thermal-power-generating technology can be divided into again two large types: a class is solar dynamic power system, and another kind of is solar energy generating.Solar dynamic power system first solar radiant energy is converted to heat energy, again thermal power transfer is become mechanical energy, finally again mechanical energy is converted to electric energy, such solar energy thermal-power-generating technology reaches actual application level at present, the practical solar energy thermal-power-generating station that some countries such as the U.S. are built of certain scale.According to the type of light-concentrating solar heat-collection device, can be divided three classes solar heat power generation system i.e. trough system, tower system and dish-style system.Butterfly system architecture is very flexible, and installed capacity is changeable, and the efficiency change of large sized unit and small-load generators is not obvious.Be applicable to distributed utilization.The structure of current butterfly and slot type resembles in many points, and enters the composition of driving mechanism and condenser.But butterfly system and trough system also also exist many different places, butterfly condenser is the paraboloid of revolution, and slot type is parabola.Butterfly system needs to adopt two-dimensional tracking mode, and slot type generally only needs to carry out one dimension tracing mode.Therefore, butterfly system is the same with trough system, and cost is very high.The present invention intends adopting a kind of paraboloid of revolution of xoncrete structure and a kind of novel tracking means, reduces costs.
Summary of the invention
Goal of the invention: for above-mentioned existing Problems existing and deficiency, the object of the present invention's a kind of concrete-type butterfly solar energy condenser lens and tracking means thereof solves butterfly solar energy system high cost problem.
Technical scheme: a kind of concrete-type butterfly solar energy condenser lens and tracking means thereof, comprises combined light gathering mirror (1), eastern traction unit (2), concrete support body (3), western traction unit (4), northern traction unit (5), southern traction unit (6);
Wherein, combined light gathering mirror (1) is made up of reflective aluminium foil (1-1), cement concrete (1-2), slide jaw (1-3), reinforcing bar (1-4), scroll wheel (1-5), transmission mounting interface (1-6);
Reinforcing bar (1-4) is bundled into circle with thin wire, put into grinding tool and strike out paraboloid of revolution type, put into cast grinding tool, pour into cement concrete (1-2), make paraboloid of revolution body, reflective aluminium foil (1-1) is pasted at paraboloid of revolution body inner surface, at reflective aluminium foil (1-1) outer surface assembling slide jaw (1-3), scroll wheel (1-5), transmission mounting interface (1-6), slide jaw (1-3) has two groups, two groups are in vertical distribution, often organize five alignment pins, scroll wheel (1-5) has two groups, two groups are in vertical distribution, often organize seven and determine roller, transmission mounting interface (1-6) has four, lay respectively at due south, positive north, due east, Zheng Xi position,
Described eastern traction unit (2) is made up of eastern motor (2-1), eastern reduction box (2-2), eastern directive wheel (2-3), eastern draught line (2-4); East motor (2-1) exports and is connected with the input of eastern reduction box (2-2), the output in east reduction box (2-2) is connected with eastern draught line (2-4) one end, the other end in east draught line (2-4) is connected with the transmission mounting interface (1-6) of position, due east, installs eastern directive wheel (2-3) in eastern draught line (2-4) centre position;
Described concrete support body (3) is made up of sliding surface (3-1), slip locating slot (3-2), concrete substrate (3-3);
Described western traction unit (4) is made up of western motor (4-1), western reduction box (4-2), western directive wheel (4-3), western draught line (4-4); The output of western motor (4-1) is connected with the input of western reduction box (4-2), the output of western reduction box (4-2) is connected with western draught line (4-4) one end, the other end of western draught line (4-4) is connected with the transmission mounting interface (1-6) of Zheng Xi position, installs western directive wheel (4-3) in the centre position of western draught line (4-4);
Described northern traction unit (5) is made up of NORTEL machine (5-1), northern reduction box (5-2), northern directive wheel (5-3), northern draught line (5-4);
The output of NORTEL machine (5-1) is connected with the input of northern reduction box (5-2), the output in north reduction box (5-2) is connected with one end of northern draught line (5-4), the other end in north draught line (5-4) is connected with the transmission mounting interface (1-6) of Zheng Bei position, installs northern directive wheel (5-3) in northern draught line (5-4) centre position;
Described southern traction unit (6) is made up of southern motor (6-1), southern reduction box (6-2), southern directive wheel (6-3), southern draught line (6-4); South draught line (6-4) is connected with the transmission mounting interface (1-6) of position, due south;
The output in south motor (6-1) inputs with southern reduction box (6-2) and is connected, the output in south reduction box (6-2) is connected with one end of southern draught line (6-4), the other end in south draught line (6-4) is connected with the transmission mounting interface (1-6) being positioned at position, due south, installs southern directive wheel (6-3) in the centre position of southern draught line (6-4).
A kind of concrete-type butterfly solar energy condenser lens and tracking means thereof, it is characterized in that combined light gathering mirror (1) supporter is made up of cement concrete (1-2), in cement concrete (1-2), reinforcing bar (1-4) is installed, after cement concrete (1-2) surface rubbing, aluminium foil (1-1) in stickup, slide jaw (1-3) coordinates with slip locating slot (3-2) installs, and scroll wheel (1-5) coordinates with sliding surface (3-1) to be installed
Described concrete support body (3) is made up of sliding surface (3-1), slip locating slot (3-2), concrete substrate (3-3).Concrete substrate (3-3) moulding by casting in grinding tool, installs slip locating slot (3-2) at sliding surface (3-1), and the material of slip locating slot (3-2) is iron.
Operation principle: combined light gathering mirror (1) is made up of reflective aluminium foil (1-1), cement concrete (1-2), slide jaw (1-3), reinforcing bar (1-4), scroll wheel (1-5), transmission mounting interface (1-6), combined light gathering mirror (1) can slide by two-dimensional directional in concrete support body (3), realizes the tracking of solar energy.Slide jaw (1-3) and slip locating slot (3-2) are slidably matched, and realize accurate tracking, scroll wheel (1-5) coordinates with sliding surface (3-1), realizes rolling friction, reduce to drive the power followed the tracks of.East traction unit (2), western traction unit (4), northern traction unit (5), southern traction unit (6) realize the automatic control of four direction, the elevation angle of adjustment combined light gathering mirror (1) and azimuth.
beneficial effect,the present invention has the following advantages:
(1) the present invention's parabola groove of utilizing cement concrete to make groove type solar, with low cost, is applicable to large-scale commercial development.
(2) the present invention adopts hydraulic-driven, and in conjunction with lever principle, drive mechanism is simple and reliable.
(3) the present invention adopts at cement concrete parabola, pastes aluminium foil, easily change light-concentrating material at inner surface.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is combined light gathering mirror structural representation;
Fig. 3 is concrete support body structure schematic diagram;
Fig. 4 is invention top view;
Fig. 5 is binding reinforcing bars structural representation;
Fig. 6 is that schematic diagram sheared by aluminium foil;
Fig. 7 is eastern traction unit structural representation;
Fig. 8 is western traction unit structural representation;
Fig. 9 is northern traction unit structural representation;
Figure 10 is southern traction unit structural representation;
In figure:
1 be combined light gathering mirror, 1-1 is reflective aluminium foil, 1-2 is cement concrete, 1-3 is slide jaw, 1-4 is reinforcing bar, 1-5 is scroll wheel, 1-6 is transmission mounting interface;
2 are eastern traction units, 2-1 is eastern motor, 2-2 is eastern reduction box, 2-3 is eastern directive wheel, 2-4 is eastern draught line;
3 are concrete support bodies, 3-1 is sliding surface, 3-2 is slip locating slot, 3-3 is concrete substrate;
4 are western traction units, 4-1 is western motor, 4-2 is western reduction box, 4-3 is western directive wheel, 4-4 is western draught line;
5 are northern traction units, 5-1 is NORTEL machine, 5-2 is northern reduction box, 5-3 is northern directive wheel, 5-4 is northern draught line;
6 are southern traction units, 6-1 is southern motor, 6-2 is southern reduction box, 6-3 is southern directive wheel, 6-4 is southern draught line.
Detailed description of the invention: 1 to Figure 10 explains the present invention further by reference to the accompanying drawings.
The object of a kind of concrete-type butterfly solar energy condenser lens and tracking means thereof solves butterfly solar energy system high cost problem.
Technical scheme: a kind of concrete-type butterfly solar energy condenser lens and tracking means thereof, comprises combined light gathering mirror (1), eastern traction unit (2), concrete support body (3), western traction unit (4), northern traction unit (5), southern traction unit (6);
Wherein, combined light gathering mirror (1) is made up of reflective aluminium foil (1-1), cement concrete (1-2), slide jaw (1-3), reinforcing bar (1-4), scroll wheel (1-5), transmission mounting interface (1-6);
Reinforcing bar (1-4) is bundled into circle with thin wire, put into grinding tool and strike out paraboloid of revolution type, put into cast grinding tool, pour into cement concrete (1-2), make paraboloid of revolution body, reflective aluminium foil (1-1) is pasted at paraboloid of revolution body inner surface, at reflective aluminium foil (1-1) outer surface assembling slide jaw (1-3), scroll wheel (1-5), transmission mounting interface (1-6), slide jaw (1-3) has two groups, two groups are in vertical distribution, often organize five alignment pins, scroll wheel (1-5) has two groups, two groups are in vertical distribution, often organize seven and determine roller, transmission mounting interface (1-6) has four, lay respectively at due south, positive north, due east, Zheng Xi position,
Described eastern traction unit (2) is made up of eastern motor (2-1), eastern reduction box (2-2), eastern directive wheel (2-3), eastern draught line (2-4); East motor (2-1) exports and is connected with the input of eastern reduction box (2-2), the output in east reduction box (2-2) is connected with eastern draught line (2-4) one end, the other end in east draught line (2-4) is connected with the transmission mounting interface (1-6) of position, due east, installs eastern directive wheel (2-3) in eastern draught line (2-4) centre position;
Described concrete support body (3) is made up of sliding surface (3-1), slip locating slot (3-2), concrete substrate (3-3);
Described western traction unit (4) is made up of western motor (4-1), western reduction box (4-2), western directive wheel (4-3), western draught line (4-4); The output of western motor (4-1) is connected with the input of western reduction box (4-2), the output of western reduction box (4-2) is connected with western draught line (4-4) one end, the other end of western draught line (4-4) is connected with the transmission mounting interface (1-6) of Zheng Xi position, installs western directive wheel (4-3) in the centre position of western draught line (4-4);
Described northern traction unit (5) is made up of NORTEL machine (5-1), northern reduction box (5-2), northern directive wheel (5-3), northern draught line (5-4);
The output of NORTEL machine (5-1) is connected with the input of northern reduction box (5-2), the output in north reduction box (5-2) is connected with one end of northern draught line (5-4), the other end in north draught line (5-4) is connected with the transmission mounting interface (1-6) of Zheng Bei position, installs northern directive wheel (5-3) in northern draught line (5-4) centre position;
Described southern traction unit (6) is made up of southern motor (6-1), southern reduction box (6-2), southern directive wheel (6-3), southern draught line (6-4); South draught line (6-4) is connected with the transmission mounting interface (1-6) of position, due south;
The output in south motor (6-1) inputs with southern reduction box (6-2) and is connected, the output in south reduction box (6-2) is connected with one end of southern draught line (6-4), the other end in south draught line (6-4) is connected with the transmission mounting interface (1-6) being positioned at position, due south, installs southern directive wheel (6-3) in the centre position of southern draught line (6-4).
A kind of concrete-type butterfly solar energy condenser lens and tracking means thereof, it is characterized in that combined light gathering mirror (1) supporter is made up of cement concrete (1-2), in cement concrete (1-2), reinforcing bar (1-4) is installed, after cement concrete (1-2) surface rubbing, aluminium foil (1-1) in stickup, slide jaw (1-3) coordinates with slip locating slot (3-2) installs, and scroll wheel (1-5) coordinates with sliding surface (3-1) to be installed
Described concrete support body (3) is made up of sliding surface (3-1), slip locating slot (3-2), concrete substrate (3-3).Concrete substrate (3-3) moulding by casting in grinding tool, installs slip locating slot (3-2) at sliding surface (3-1), and the material of slip locating slot (3-2) is iron.
After reflective aluminium foil (1-1) is called for short sector structure, be pasted onto the inner surface of cement concrete (1-2).
The foregoing is only better embodiment of the present invention; protection scope of the present invention is not limited with above-mentioned embodiment; in every case those of ordinary skill in the art modify or change according to the equivalence that disclosed content is done, and all should include in the protection domain recorded in claims.
Claims (2)
1. concrete-type butterfly solar energy condenser lens and a tracking means thereof, comprises combined light gathering mirror (1), eastern traction unit (2), concrete support body (3), western traction unit (4), northern traction unit (5), southern traction unit (6);
Wherein, combined light gathering mirror (1) is made up of reflective aluminium foil (1-1), cement concrete (1-2), slide jaw (1-3), reinforcing bar (1-4), scroll wheel (1-5), transmission mounting interface (1-6);
Reinforcing bar (1-4) is bundled into circle with thin wire, put into grinding tool and strike out paraboloid of revolution type, put into cast grinding tool, pour into cement concrete (1-2), make paraboloid of revolution body, reflective aluminium foil (1-1) is pasted at paraboloid of revolution body inner surface, at reflective aluminium foil (1-1) outer surface assembling slide jaw (1-3), scroll wheel (1-5), transmission mounting interface (1-6), slide jaw (1-3) has two groups, two groups are in vertical distribution, often organize five alignment pins, scroll wheel (1-5) has two groups, two groups are in vertical distribution, often organize seven and determine roller, transmission mounting interface (1-6) has four, lay respectively at due south, positive north, due east, Zheng Xi position,
Described eastern traction unit (2) is made up of eastern motor (2-1), eastern reduction box (2-2), eastern directive wheel (2-3), eastern draught line (2-4); East motor (2-1) exports and is connected with the input of eastern reduction box (2-2), the output in east reduction box (2-2) is connected with eastern draught line (2-4) one end, the other end in east draught line (2-4) is connected with the transmission mounting interface (1-6) of position, due east, installs eastern directive wheel (2-3) in eastern draught line (2-4) centre position;
Described concrete support body (3) is made up of sliding surface (3-1), slip locating slot (3-2), concrete substrate (3-3);
Described western traction unit (4) is made up of western motor (4-1), western reduction box (4-2), western directive wheel (4-3), western draught line (4-4); The output of western motor (4-1) is connected with the input of western reduction box (4-2), the output of western reduction box (4-2) is connected with western draught line (4-4) one end, the other end of western draught line (4-4) is connected with the transmission mounting interface (1-6) of Zheng Xi position, installs western directive wheel (4-3) in the centre position of western draught line (4-4);
Described northern traction unit (5) is made up of NORTEL machine (5-1), northern reduction box (5-2), northern directive wheel (5-3), northern draught line (5-4);
The output of NORTEL machine (5-1) is connected with the input of northern reduction box (5-2), the output in north reduction box (5-2) is connected with one end of northern draught line (5-4), the other end in north draught line (5-4) is connected with the transmission mounting interface (1-6) of Zheng Bei position, installs northern directive wheel (5-3) in northern draught line (5-4) centre position;
Described southern traction unit (6) is made up of southern motor (6-1), southern reduction box (6-2), southern directive wheel (6-3), southern draught line (6-4); South draught line (6-4) is connected with the transmission mounting interface (1-6) of position, due south;
The output in south motor (6-1) inputs with southern reduction box (6-2) and is connected, the output in south reduction box (6-2) is connected with one end of southern draught line (6-4), the other end in south draught line (6-4) is connected with the transmission mounting interface (1-6) being positioned at position, due south, installs southern directive wheel (6-3) in the centre position of southern draught line (6-4).
2. a kind of concrete-type butterfly solar energy condenser lens according to claim 1 and tracking means thereof, it is characterized in that combined light gathering mirror (1) supporter is made up of cement concrete (1-2), in cement concrete (1-2), reinforcing bar (1-4) is installed, after cement concrete (1-2) surface rubbing, aluminium foil (1-1) in stickup, slide jaw (1-3) coordinates with slip locating slot (3-2) installs, and scroll wheel (1-5) coordinates with sliding surface (3-1) to be installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610090088.XA CN105546839A (en) | 2016-02-18 | 2016-02-18 | Concrete-type butterfly solar concentrator and tracking device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610090088.XA CN105546839A (en) | 2016-02-18 | 2016-02-18 | Concrete-type butterfly solar concentrator and tracking device thereof |
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| CN201610090088.XA Pending CN105546839A (en) | 2016-02-18 | 2016-02-18 | Concrete-type butterfly solar concentrator and tracking device thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2505022A1 (en) * | 1980-09-05 | 1982-11-05 | Stanford Res Inst Int | HOLLOW CONCRETE FORMWORK BEAM COMPRESSED |
| CN85203102U (en) * | 1985-07-29 | 1986-06-04 | 王洪明 | Reflective simply constructed solar cooker |
| CN104238570A (en) * | 2013-06-13 | 2014-12-24 | 浙江同景新能源集团有限公司 | Solar dual-tracking system |
| CN104567017A (en) * | 2015-01-08 | 2015-04-29 | 十堰榔梅实业有限公司 | Arc-shaped track type solar universal fixed-focal concentration device and solar heat collecting device |
| CN205505441U (en) * | 2016-02-18 | 2016-08-24 | 李俊娇 | Concrete type butterfly solar energy condensing lens and tracking means thereof |
-
2016
- 2016-02-18 CN CN201610090088.XA patent/CN105546839A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2505022A1 (en) * | 1980-09-05 | 1982-11-05 | Stanford Res Inst Int | HOLLOW CONCRETE FORMWORK BEAM COMPRESSED |
| CN85203102U (en) * | 1985-07-29 | 1986-06-04 | 王洪明 | Reflective simply constructed solar cooker |
| CN104238570A (en) * | 2013-06-13 | 2014-12-24 | 浙江同景新能源集团有限公司 | Solar dual-tracking system |
| CN104567017A (en) * | 2015-01-08 | 2015-04-29 | 十堰榔梅实业有限公司 | Arc-shaped track type solar universal fixed-focal concentration device and solar heat collecting device |
| CN205505441U (en) * | 2016-02-18 | 2016-08-24 | 李俊娇 | Concrete type butterfly solar energy condensing lens and tracking means thereof |
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