CN201344650Y

CN201344650Y - Fresnel optical collector

Info

Publication number: CN201344650Y
Application number: CNU2009200047426U
Authority: CN
Inventors: 吴兆流
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-10
Filing date: 2009-02-10
Publication date: 2009-11-11
Anticipated expiration: 2019-02-10

Abstract

The utility model relates to a Fresnel optical collector, which is an optical collecting element for collecting solar energy. The Fresnel optical collector mainly comprises surface glass (1), a Fresnel lens (2), a support (3) and back glass (4), and is characterized in that refraction ray (18) of each section can be refracted to the same strip-shaped surface, and refraction ray (18) refracted by a refraction tooth (6) on each section is refracted to the same strip-shaped surface in parallel. The Fresnel optical collector has the advantages that the temperature of the heating surface of a heat-absorbing body (19) is even. If the Fresnel optical collector is adopted on a photo-voltaic cell, the usage of the photo-voltaic cells can be reduced, and the investment is lowered. The Fresnel optical collector can be adopted to supply a great amount of high temperature heat energy generated by solar energy for the production and living of people, and can be widely applied in the fields of solar energy making hot water, photovoltaic power generation, hot supply and drying and the like.

Description

The Fresnel concentrator

The present invention relates to a kind of Fresnel concentrator, is a kind of concentrator that can assemble solar energy.It can face with solar focusing to a band shape on, produce high temperature heat, can use widely in fields such as solar energy hot water, solar heating, solar energy thermal-power-generating and solar energy power generatings.

China's development and use solar energy has had the history of decades, photovoltaic cell and solar water heater have become first big country of production and selling in the world, the enterprise that produces photovoltaic cell (photoelectricity) in recent years is also in develop rapidly, and the solar water heater's of China's sale at present total amount has 90,000,000 m approximately ², the generating total amount of photovoltaic plant has nearly m. gigawatt (GW), but the cost of photovoltaic generation be about 2.5 yuan/more than the kwh.Up to the present also there are not lower solar energy thermal-power-generating product of cost and high temperature solar boiler to put on market.Therefore, the demand to new products such as Salar light-gathering, new technology more and more is urgent.

At present, the Fresnel concentrator that does not also have this form, existing Fresnel Lenses has only point focusing and line focus two classes, because the focus after this two classes Fresnel Lenses focuses on is point or line, too high fragile photovoltaic cell of local temperature or absorber, all there are same problem such as too high fragile photovoltaic cell of local temperature or absorber in point focusing of using and line focus Fresnel Lenses now.Technology contents described in " EPODOC/EPO ".At present, most widely used still a kind of parabolical, spherical mirror, but it does not belong to the similar technology of Fresnel Lenses.Because existing Fresnel Lenses exists shortcomings such as too high fragile photovoltaic cell of local temperature or absorber, caused very big economic loss for some application vendor.Therefore, applying of existing Fresnel Lenses has been subjected to very big restriction.Now disclosed point focusing formula and line focus formula Fresnel Lenses technology are a kind of known typical common Fresnel Lenses, and so-called point focusing is meant that its focus is a point, rather than a line; Line focus is meant that its focus is a line, rather than a face, neither a point.Therefore, this technology needs solar cell is placed between lens and the focus when using, and can not be placed directly on the position of focus, as be placed on the focus and solar cell can be burnt out, place between lens and the focus, exist the focal spot middle part too high fragile photovoltaic cell of temperature or this problem of absorber (as the described technology of CH600353A5 file etc.) equally, because, light behind line Jiao's of this lens the refracted ray finally is to want the directive focus, therefore, solar cell or absorber are placed between focus and the lens, have just formed the high-temperature region because light has all focused on the center of focal spot.In addition, this product is as when tracker breaks down, the focus direct projection sometimes might appear on solar cell or absorber, high temperature will burn out solar cell or absorber like this, it is topic that there is this too in the burnt formula of point, and this is to put burnt formula and the known defective of linear focus Fresnel Lenses at present.It also is the reason that can not be widely used.

The solar energy resources of China is very abundant, and area day of 70%, illumination was all at 1kw/m ²More than.If people can develop use solar energy energetically, solar energy can solve the institute's available energy in people's productive life, and solar energy is a kind of clean energy resource of cleaning.A large amount of uses it, can reduce people use fossil energy to the greenhouse gases of airborne release; Use fossil energy not only to waste resource, polluted environment, also endangered the healthy of people.Along with the raising of expanding economy and people's living standard, the situation of energy shortage shortage is more and more severeer in addition, and the worldwide contention energy has become global main factor leading to social instability, and it is extremely urgent to develop new alternative energy source.

We if can use these tellurian solar energy resourceses, worldwide energy shortage, and problems such as environmental pollution also just have been readily solved.Therefore, develop the Fresnel concentrator of this form, provide a kind of reliable optically focused core parts imperative for solar electrical energy generation or solar-heating equipment, press for, market prospects are wide.

The present invention will provide a kind of Fresnel concentrator, be a kind of can be with the collective optics on solar light focusing to the bar zone face.Can make field of solar energy utilization obtain high temperature heat source, and its focus is the face of a band shape, rather than line, neither point, can not burn heat absorbing element because of focal spot temperature is too high.Can be widely used in fields such as solar energy thermal-power-generating or solar energy power generating.As be used on the photovoltaic cell, can also reduce consumption to photovoltaic cell, significantly reduce investment, this technology provides a kind of novel solar energy light gathering element for the utilization of solar energy.

Technical solution of the present invention is: the Fresnel concentrator mainly is made up of surface glass, Fresnel Lenses, support and back of the body glass.Fresnel Lenses can be bonded at below the surface glass, also can be bonded at above the back of the body glass.Refraction tooth on the Fresnel Lenses is made up of the group section, makes the lip-deep temperature of absorber even.

The present invention achieves the above object to realize by this way: the refraction tooth on the Fresnel Lenses is divided into the group section, be group sections such as A group section, B group section, C group section, D group section, E group section, angle of refraction tooth in each group section is identical, the directive absorber that the refracted ray after refraction tooth on this group section is reflected can both be parallel.The group section gradually changes with organizing intersegmental angle, is a angle＞b angle＞c angle＞d angle＞angles such as e angle, and each refracted ray of organizing after section reflects also can both the directive absorber.Formed like this focal spot is the face of a band shape, thereby it is even to obtain the lip-deep temperature of absorber.

The number of degrees of angle will calculate the corner dimension of each group section with thickness and the refractive index and the required distance of glass, Fresnel Lenses with known formula.

Realization of the present invention, technical solution are to be provided with surface glass on the Fresnel concentrator, and Fresnel Lenses is bonded at below the surface glass, but rainwater and the dust on the blocking surface also in the use.

Realization of the present invention, technical solution are after the surrounding of surface glass is stained with support, are stained with back of the body glass again, and back of the body glass in use can stop the rainwater and the dust of below.

Realization of the present invention, technical solution are to be stained with surface glass on support, and are stained with back of the body glass below supporting, and make the Fresnel concentrator form an integral body like this.

The present invention compares with existing Fresnel Lenses, has the following advantages:

One, the bar zone face focuses on.The absorber surface temperature is even, can be because of a focal spot or the too high absorber that burns out of line focal spot temperature.

Two, reduce manufacturing cost.The present invention is convenient to corresponding combination and is installed, and makes when making product of the present invention, and factory can reduce the die cost (as comparing with existing Fresnel Lenses product, when daylighting area is identical) of half.

Three, reduce the tracking means cost.Product of the present invention can absorber be rotating shaft, and the teeth directional of Fresnel Lenses is that East and West direction is placed, and the north-south follows the sun to rotate, and only needs the north-south to follow the tracks of, and does not need East and West direction to follow the tracks of.

Four, long service life.Product of the present invention is placed on the centre of two blocks of glass with Fresnel Lenses, forms the Fresnel concentrator, and can not beat because of dust storm, rain like this influences service life.

Five, be convenient to packed and transported.Can use with the corresponding assembling use of a kind of product because of product of the present invention, therefore, the product size only is equivalent to half size of existing like product size, facilitates like this to pack and transported.

According to above content, novelty of the present invention and the creative directive absorber that is that the refracted ray after a refraction tooth on the group section reflects can both be parallel.Make the temperature on absorber surface even, can not burn out absorber because of a focal spot or line focal spot; Also can reduce the cost of investment (only needing single-direction tracing) of tracking; With two blocks of glass Fresnel Lenses is protected in the centre, product prolongs service life greatly.

The invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of the present invention, and Fig. 2 is a side view of the present invention, and Fig. 3 is that schematic diagram is used in the monolateral installation of the present invention, and Fig. 4 is that corresponding installation of the present invention used schematic diagram.Not limited by this figure.

Among the figure: 1 surface glass, 2 Fresnel Lenses, 3 support, 4 back of the body glass, 5 adhesive glues, 6 refraction teeth, 7A organizes section, 8B organizes section, and 9C organizes section, and 10D organizes section, and 11E organizes section, 12a angle, 13b angle, 14c angle, the 15d angle, 16e angle, 17 Fresnel concentrators, 18 refracted rays, 19 absorbers, 20 light.

With reference to Fig. 1, Fig. 2, surface glass (1) is that composites such as glass or lucite are hot-pressed onto upward moulding Fresnel Lenses (2) of surface glass (1) with known method with transparent silica gel, refraction tooth (6) is carved on pressing mold, the angle of each group section is identical, and a angle (12) of organizing all the refraction teeth (6) on the section (7) as A all is identical.The group section is gradual change with organizing intersegmental angle, as a angle (12)＞b angle (13)＞c angle (14)＞d angle (15)＞e angle (16) etc., after surface glass (1) four limit that will form Fresnel Lenses (2) glues support (3) earlier, to carry on the back glass (4) again and be bonded together, just form Fresnel concentrator (17) with supporting (3).

Embodiments of the invention are achieved in that

Fresnel Lenses of the present invention (2) is the transparent silica gel material of buying from the market, surface glass (1), back of the body glass (4) and support (3) are the finished products of buying from the market, with known hot-press method Fresnel Lenses (2) are hot-pressed onto on surface glass (1) or the back of the body glass (4); That is: make mould earlier, surface glass (1) or back of the body glass (4) are placed on the workbench, after the mould of Fresnel Lenses (2) and surface glass (1) got togather, transparent silica gel is injected in the mould, heat transparent silica gel again, when treating that transparent silica gel is melted, firmly mould is compressed put in place after, water flowing cooling again, can go up at surface glass (1) and form Fresnel Lenses (2), after deburring, just can use adhesive glue (5) bonding one by one again, form product Fresnel concentrator (17) at last supporting (3) and back of the body glass (4).

When the present invention uses, with reference to Fig. 3, with monolithic Fresnel concentrator (17), be installed in a side of the top of absorber (19), assemble with support, when light (20) sees through Fresnel concentrator (17), the refracted ray after the refraction (18) can both directive absorber (19) on, can make optically focused and use, support should be provided with tracking means.Also can be with reference to Fig. 4, two Fresnel concentrators (17) correspondence is installed in the top of absorber (19), assemble with support, when light (20) sees through two Fresnel concentrators (17), refracted ray after the refraction (18) can both directive absorber (19) on, can use by optically focused, at this moment the heat than monolithic concentrator doubles, and support also should be provided with tracking means.Use product of the present invention can make solar energy heat utilization device obtain the heat energy of higher temperature.Thereby enlarge the range of application of solar energy.As be used on the photovoltaic cell, can significantly reduce the use amount of photovoltaic cell, reduce total amount of investment, reduce the cost of electricity-generating of photovoltaic cell.Also can be directly used in fields such as solar water generating.

Claims

1, a kind of Fresnel concentrator mainly is made up of surface glass (1), Fresnel Lenses (2), support (3) and back of the body glass (4).The refracted ray (18) that it is characterized in that each group section can both be refracted on the face of same band shape; And the refracted ray (18) after the refraction tooth (6) in each group section reflects is on the parallel face that is refracted to same band shape.Its technical characterictic is that the generating surface temperature of absorber (19) is even.

2, Fresnel concentrator according to claim 1 is characterized in that: both hot pressing was below surface glass (1) for Fresnel Lenses (2), and also hot pressing is on back of the body glass (4).

3, Fresnel concentrator according to claim 1 is characterized in that: support (3) is located at the periphery between surface glass (1) and the back of the body glass (4), and surface glass (1) and back of the body glass (4) are linked to be an integral body.