CN102645685A

CN102645685A - Uniformly-converging Fresnel lens

Info

Publication number: CN102645685A
Application number: CN2012101547098A
Authority: CN
Inventors: 刘永强
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-05-18
Filing date: 2012-05-18
Publication date: 2012-08-22

Abstract

The invention relates to a Fresnel lens and particularly relates to a uniformly-converging Fresnel lens. When the traditional Fresnel lens is used for converging light, the light convergence on the surface of a battery is not uniform, resulting in the problems that the loss of series resistors in the battery is increased, the conversion efficiency of the battery is reduced and the service life of the battery is influenced; and through adoption of the uniformly-converging Fresnel lens, the problems can be overcome. The uniformly-converging Fresnel lens is characterized in that the lower surface of a transparent body is fixedly connected with the upper surface of a lens body to form a whole body; a triangular pyramid bulge is arranged at one corner of the lower surface of each square sub-lens body, which is close to the center of the lower surface of the lens body; a plurality of rows of strip-shaped bulges with triangular cross sections are arranged on the lower surface of each square sub-lens body in parallel; the triangular pyramid bulge on the lower surface of each square sub-lens body and the triangular pyramid bulges of the other three square sub-lens bodies are spliced to form a pyramid-shaped bulge; and each strip-shaped bulge of each square sub-lens body and the strip-shaped bulges at the corresponding positions of the other three square sub-lens bodies form a four-edge frame body. The uniformly-converging Fresnel lens is used for a solar energy field.

Description

A kind of uniform convergence Fresnel Lenses

Technical field

The present invention relates to a kind of Fresnel Lenses, be specifically related to a kind of uniform convergence Fresnel Lenses.

Background technology

Traditional energy is on the verge of exhaustion, and energy problem becomes increasingly conspicuous, and sun power is abundant with its reserves, the unique advantage extensive, green non-pollution that distributes gets most of the attention.In the Application of Solar Energy field, photovoltaic power generation technology has bright development prospect.

Condensation photovoltaic is a third generation photovoltaic system, partly substitutes expensive solar cell with relatively inexpensive condenser, has improved system's transformation efficiency, has reduced system cost.Concentration photovoltaic system is with the obvious advantage; But also exist some problems to need to solve, as carrying out optically focused with traditional Fresnel Lenses, battery surface optically focused skewness; Cause the inside battery series resistance losses to increase; Cell conversion efficiency descends, and the hot localised points that high power concentrator produces can be damaged battery, influences battery life; Improve the optically focused distribution and introduce the secondary condensation device, not only increase system cost, and make the system assembles debugging become complicated, be unfavorable for practical application.

Summary of the invention

The present invention uses traditional Fresnel Lenses to carry out optically focused for solving, and battery surface optically focused skewness causes the inside battery series resistance losses to increase, and cell conversion efficiency descends, and influences the problem of battery life, and then proposes a kind of uniform convergence Fresnel Lenses.

The present invention addresses the above problem the technical scheme of taking to be: the present invention includes the mirror body and the transparent body; The mirror body is the square mirror body that divides the mirror body to be spliced into by four size squares identical with shape; The upper surface of the lower surface of the transparent body and mirror body is affixed to be integral; One jiao near mirror body lower surface center on each square branch mirror body lower surface is provided with triangular taper convexity; Parallel side by side many horizontal rows cross section that is provided with is leg-of-mutton strip projected parts on each square branch mirror body lower surface; Each square divides the triangular taper convexity on the mirror body lower surface to divide the triangular taper convexity on the mirror body to be spliced into the pyramid shape convexity with other three squares, and each strip projected parts and other three squares on each square branch mirror body divide the strip projected parts of opposite position on the mirror body to form four frameworks.

The invention has the beneficial effects as follows: the present invention adopts from the non-rotational symmetry structure of axle; Utilize single lens to realize uniform convergence to sunshine; Improved solar battery surface light distribution homogeneity greatly; Improve transformation efficiency, and made battery avoid the damage that the optically focused skewness causes, prolonged battery serviceable life; The present invention can change the outgoing position of uniform light spots through first inclination angle of adjusting its each strip projected parts cross-sectional triangle; And can set lens each minute mirror body home position according to the size of solar cell; The uniform light spots that acquisition and solar cell size are mated fully; Improve capacity usage ratio, flexible and controllable; The zonary structure that employing of the present invention is similar with conventional lenses; But the advantage that followed little, the in light weight array of its volume, be easy to mass production, cost is low; Can directly substitute the conventional lenses in the condensation photovoltaic module, and not influence the Installation and Debugging of system, can widespread use.

Description of drawings

Fig. 1 is a vertical view of the present invention, and Fig. 2 is that A-A is to cut-open view among Fig. 1, and Fig. 3 is that the present invention focuses on schematic three dimensional views, and Fig. 4 is that xsect focuses on synoptic diagram at the diagonal line place in the present invention.

Embodiment

Embodiment one: combine Fig. 1 and Fig. 2 that this embodiment is described; The said a kind of uniform convergence Fresnel Lenses of this embodiment comprises the mirror body 1 and the transparent body 2; Mirror body 1 is the square mirror body 1 that divides mirror body 3 to be spliced into by four size squares identical with shape; The upper surface of the lower surface of the transparent body 2 and mirror body 1 is affixed to be integral; One jiao near mirror body 1 lower surface center on each square branch mirror body 3 lower surface is provided with the protruding 3-1 of triangular taper; Parallel side by side many horizontal rows cross section that is provided with is leg-of-mutton strip projected parts 3-2 on each square branch mirror body 3 lower surface; Each square divides the protruding 3-1 of the triangular taper on mirror body 3 lower surfaces and other three squares to divide the protruding 3-1 of triangular taper on the mirror body 3 to be spliced into the pyramid shape convexity, and each square divides each strip projected parts 3-2 and other three squares on the mirror body 3 to divide the strip projected parts 3-2 of opposite position on the mirror body 3 to form four frameworks.

Each square divides the protruding 3-1 of triangular taper and a plurality of strip projected parts 3-2 on the mirror body 3 to have the same center of circle in this embodiment.

Embodiment two: combine Fig. 1 and Fig. 2 that this embodiment is described, the transparent body 2 of the said a kind of uniform convergence Fresnel Lenses of this embodiment is all identical with the square mirror body 1 square transparent plate of big or small and shape.Other composition and annexation are identical with embodiment one.

Embodiment three: combine Fig. 2 that this embodiment is described, each square of the said a kind of uniform convergence Fresnel Lenses of this embodiment divides the height ecto-entad of the many rows strip projected parts 3-2 on the mirror body 3 to successively decrease successively.Other composition and annexation are identical with embodiment one.

Embodiment four: combine Fig. 2 that this embodiment is described, first inclination alpha of each strip projected parts 3-2 of the said a kind of uniform convergence Fresnel Lenses of this embodiment is less than 90 °, and second angle of inclination beta of the protruding 3-2 of each frame shape is not more than 90 °.Can change the outgoing position of uniform light spots in this embodiment through first inclination alpha of adjusting its each strip projected parts 3-2 cross-sectional triangle.Other composition and annexation are identical with embodiment one, two or three.

Principle of work

In conjunction with Fig. 3 and Fig. 4 principle of work of the present invention is described:

Parallel beam incides the upper surface of the transparent body 2; Four squares divide the light distribution in the mirror body 3 even; Incident beam produces four separate bundle light after each square on mirror body 1 lower surface divides the protruding 3-1 of triangular taper and a plurality of strip projected parts 3-2 refraction on mirror body 3, vertical with the lower surface of the transparent body 2 respectively and four the focal axis focusing through four centers of circle on four square branch mirror bodies 3 of four bundle light; There is overlapped zone in four bundle light in transmission course; When four bundle light transmission arrived a certain ad-hoc location, four bundle light overlapped to form a square hot spot fully, and light distribution is even in this square hot spot.

Claims

1. uniform convergence Fresnel Lenses; It is characterized in that: said a kind of uniform convergence Fresnel Lenses comprises the mirror body (1) and the transparent body (2); Mirror body (1) is to divide the mirror body square mirror body (1) that (3) are spliced into by four size squares identical with shape; Affixed being integral of upper surface of the lower surface of the transparent body (2) and mirror body (1); One jiao near mirror body (1) lower surface center on each square branch mirror body (3) lower surface is provided with triangular taper protruding (3-1); Parallel side by side many horizontal rows cross section that is provided with is leg-of-mutton strip projected parts (3-2) on each square branch mirror body (3) lower surface; Each square divides the triangular taper protruding (3-1) on mirror body (3) lower surface to divide the triangular taper protruding (3-1) on the mirror body (3) to be spliced into the pyramid shape convexity with other three squares, and each square divides each strip projected parts (3-2) on the mirror body (3) to form four frameworks with the strip projected parts (3-2) that other three squares divide mirror body (3) to go up opposite position.

2. according to the said a kind of uniform convergence Fresnel Lenses of claim 1, it is characterized in that: the transparent body (2) is the size square transparent plate all identical with mirror body (1) with shape.

3. according to the said a kind of uniform convergence Fresnel Lenses of claim 1, it is characterized in that: each square divides the height ecto-entad of the many rows strip projected parts (3-2) on the mirror body (3) to successively decrease successively.

4. according to claim 1,2 or 3 said a kind of uniform convergence Fresnel Lenses, it is characterized in that: first inclination angle (α) of each strip projected parts (3-2) is less than 90 °, and second inclination angle (β) of each frame shape protruding (3-2) is not more than 90 °.