CN205404942U - Be applied to focusing photovoltaic generation's even spotlight fresnel lens of seven focuses stack - Google Patents

Abstract

The utility model provides a seven-focus superimposed uniform concentrating Fresnel lens applied to concentrating photovoltaic power generation, which includes six identical concentric polygonal fan-shaped unit Fresnel lenses and a regular hexagonal unit Fresnel lens, six The second side of the same concentric polygonal fan-shaped unit Fresnel lens is sequentially connected and spliced, and the second side of the concentric polygonal fan-shaped unit Fresnel lens is sequentially connected with the fourth side of the regular hexagonal unit Fresnel lens Closely connected, the length of the second side is the same as that of the fourth side; the seven-unit Fresnel lens improves the uniformity of the energy of the focused spot through the superposition of light waves, and avoids the local hot spot formed by the uneven concentration of the traditional point-focus Fresnel lens , thereby improving the solar energy conversion efficiency and battery life, and the seven-focus superimposed uniform concentrating Fresnel lens has the advantages of simple structure, easy realization, and low cost.

Description

Seven-focal superposition uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation

【Technical field】

The utility model relates to the technical field of concentrating lenses, in particular to a seven-focus superimposed uniform concentrating Fresnel lens applied to concentrating photovoltaic power generation.

【Background technique】

Photovoltaic power generation is a major form of direct utilization of solar energy. The Fresnel lens is one of the core components of the concentrated photovoltaic system. Its performance directly affects the performance of the entire system. The traditional point concentrated Fresnel lens is The energy distribution of the concentrated spot is uneven. After the incident sunlight is concentrated, local hot spots will be formed on the surface of the battery. The photoelectric conversion efficiency of the power generation system is low.

【Content of utility model】

Aiming at the problems existing in the traditional point concentrating Fresnel lens, the purpose of this utility model is a seven-focus superimposed uniform concentrating Fresnel lens applied to concentrating photovoltaic power generation. By decomposing the traditional point concentrating Fresnel lens It is divided into seven parts, and then these seven parts are recombined to improve the uniformity of the energy distribution of the focused spot according to the superposition principle of light.

In order to achieve the above object, the utility model provides the following technical solutions:

A seven-focus superimposed uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation, including six identical concentric polygonal fan-shaped unit Fresnel lenses and a regular hexagonal unit Fresnel lens; the concentric polygonal fan-shaped unit Fresnel lens The lens surface of the Erlenmeyer lens is engraved with concentric circular arcs from small to large, and the fan-shaped lens surface includes arc edges and first, second, and third sides; the second edge opposite to the arc edges passes through the concentric polygonal sector unit Fresnel The center of the concentric arc of the lens, the two endpoints of the second side are respectively connected to the first side and the third side, the first side and the third side are symmetrical about the straight line L, and the straight line L is perpendicular to the second side and passes through the concentric circle the center of the arc;

The lens surface of the described regular hexagonal unit Fresnel lens comprises six mutually 120 ° fourth sides, and the interior includes four concentric rings; the fourth side is tangent to the fourth ring of the concentric rings and The opening angle with the center of the concentric ring is 60°;

The second sides of six identical concentric polygonal fan-shaped unit Fresnel lenses are spliced end to end in sequence, and the second side of the concentric polygonal fan-shaped unit Fresnel lens is sequentially connected with the first side of the regular hexagonal unit Fresnel lens. The four sides are tightly connected, and the second and fourth sides have the same length.

Further, the third arc from the inside to the outside of the lens surface of the concentric polygonal sector unit Fresnel lens is a semicircle, and the second side passes through the center of the concentric arc and completely coincides with the chord of the third arc.

Further, the regular hexagonal unit Fresnel lens and the concentric polygonal fan-shaped unit Fresnel lens are obtained by cutting a point-focus Fresnel lens.

The utility model has the advantages of:

The seven-focus superimposed uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation includes six identical concentric polygonal fan-shaped unit Fresnel lenses and a regular hexagonal unit Fresnel lens, and the seven unit Fresnel lenses pass through The superposition of light waves improves the uniformity of the energy of the focused spot, avoiding the local hot spot formed by the uneven concentration of the traditional point concentrating Fresnel lens, thereby improving the solar energy conversion efficiency and battery life.

Furthermore, as long as the conventional spot-focusing Fresnel lens needs to be cut and spliced, no new structural design is required, so the lens structure is simple, easy to implement, and relatively low in cost. Low.

【Description of drawings】

Fig. 1 is a front view of a Fresnel lens with seven focal points superimposed and uniformly concentrated for concentrated photovoltaic power generation in Embodiment 1.

Fig. 2 is the front view of the Fresnel lens with concentric polygonal sector unit in Embodiment 1.

3 is a front view of a regular hexagonal unit Fresnel lens in Embodiment 1.

Fig. 4 is a schematic diagram of cutting of a regular hexagonal unit Fresnel lens in Embodiment 2.

Fig. 5 is a schematic diagram of the cutting of the Fresnel lens of the concentric polygonal sector unit in Embodiment 3.

Marks in the figure: 1-Fresnel lens with seven focal points superimposed with concentrating photovoltaic power generation and uniform concentrating, 2-Fresnel lens with concentric polygonal sector unit, 3-First side, 4-Second side, 5-Third side, 6-regular hexagonal unit Fresnel lens, 7-fourth side, 8-point concentrating Fresnel lens, 9-concentric polygonal fan-shaped unit Fresnel lens cutting line, 10-regular hexagonal unit Fresnel lens Cutting line.

【detailed description】

Below in conjunction with accompanying drawing and embodiment the utility model is further described. However, it should not be understood that the scope of the above subject matter of the present utility model is limited to the following embodiments, and all technologies realized based on the content of the above utility model belong to the scope of the present utility model.

Example 1

The front view of the Fresnel lens 1 for concentrating photovoltaic power generation with seven focal points superimposed uniformly in this embodiment is shown in FIG. 1 . It is spliced by six identical concentric polygonal sector unit Fresnel lenses 2 as shown in Figure 2 and a regular hexagonal unit Fresnel lens 6 as shown in Figure 3; The lens surface of the lens 2 is engraved with concentric circular arcs from small to large, and the lens surface is a concentric polygonal sector, including the first side 3, the second side 4, the third side 5 and arc edges; the second side 4 The two endpoints of are connected to the first side 3 and the third side 5 respectively, the third arc from the inside to the outside of the lens surface is a semicircle, the second side 4 passes through the center of the concentric arc, and is connected to the third side The chords of the arcs coincide completely; the first side 3 and the third side 5 are symmetrical about the straight line L, which is perpendicular to the second side 4 and passes through the center of the concentric arc of the lens surface.

The lens face of described regular hexagonal unit Fresnel lens 6 comprises six the 120 ° fourth sides 7 that mutually form, and described lens face inside comprises four concentric annular bands; The fourth side 7 and the fourth concentric annular band The strips are tangent to each other and have an opening angle of 60° with the center of the concentric rings.

The concentrating photovoltaic power generation seven-focus superimposed uniform concentrating Fresnel lens 1 is spliced by the second side 4 of the same concentric polygonal fan-shaped unit Fresnel lens end to end in sequence, and the concentric polygonal fan-shaped unit Fresnel lens The second side 4 is closely connected with the fourth side 7 of the regular hexagonal unit Fresnel lens in turn.

Example 2

The regular hexagonal unit Fresnel lens 6 in the concentrating photovoltaic power generation seven-focus superimposed uniform concentrating Fresnel lens 1 described in this embodiment can be obtained by cutting from the traditional point-focusing Fresnel lens 8, including the following steps:

(1) Make a regular hexagon at the center of the traditional point-focus Fresnel lens 8, and the six sides 9 of the hexagon are respectively tangent to the concentric circle corresponding to the fourth annulus outward from the center of the circle, as Figure 4 shows.

(2) Cut the regular hexagonal unit Fresnel lens 6 from the spot-concentrating Fresnel lens 8 along the six sides 9 of the regular hexagon.

Example 3

The concentric polygonal fan-shaped unit Fresnel lens 2 in the concentrating photovoltaic power generation seven-focus superposition uniform concentrating Fresnel lens 1 described in this embodiment can be obtained by cutting from the traditional point-focusing Fresnel lens 8, including the following steps :

(1) Repeat the above steps, make a regular hexagon at the center of the traditional point-focusing Fresnel lens 8, and the six sides of the regular hexagon are respectively in phase with the concentric circles corresponding to the fourth annulus outwards from the center of the circle Cut, adjust the angle of the regular hexagon so that the straight line from the center of the concentric circle just intersects the two vertices of the regular hexagon at two points A and B, as shown in Figure 5.

(2) The other two pairs of vertices EG, FH connecting the regular hexagon are tangent to the third annular band of the concentric ring and two points C and D, and the section CD is cut on the straight line AB, with Ensure that the second side 4 of the concentric polygonal sector unit Fresnel lens 2 is opposite to the side length of the regular hexagon.

(3) Connect the OE, OF and extend to the outside of the concentric circle garden, to ensure that the second side 4 of the concentric polygonal fan-shaped unit Fresnel lens 2 is 60 ° with the center of the concentric annulus, as shown in the figure 5.

(4) Make the parallel lines 10 of the OE and OF through the points C and D respectively, and extend to the outside of the concentric circles.

The concentric polygonal fan-shaped unit Fresnel lens 2 can be cut from the traditional point-focus Fresnel lens 8 along the regular hexagonal unit Fresnel lens cutting line 10 shown in FIG. 5 .

Claims (3)

1. The seven-focus superimposed uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation is characterized in that it includes six identical concentric polygonal fan-shaped unit Fresnel lenses (2) and a regular hexagonal unit Fresnel lens (6); The lens surface of the concentric polygonal fan-shaped unit Fresnel lens (2) is engraved with concentric circular arcs from small to large, and the fan-shaped lens surface includes arc edges and the first side (3), the second side (4), and the third side (5); the second side (4) opposite to the arc side passes through the center of the concentric arc of the concentric polygonal fan-shaped unit Fresnel lens (2), and the two endpoints of the second side (4) are respectively connected to the first side (3) ) is connected to the third side (5), the first side (3) and the third side (5) are symmetrical about the straight line L, the straight line L is perpendicular to the second side (4) and passes through the center of the concentric arc; The lens surface of described regular hexagonal unit Fresnel lens (6) comprises six mutually 120 ° fourth sides (7), and the inside comprises four concentric annulus; The fourth side and the fourth concentric annulus The strips are tangent and have an opening angle of 60° with the center of the concentric rings; The second sides (4) of six identical concentric polygonal fan-shaped unit Fresnel lenses (2) are sequentially spliced end to end, and the second sides (4) of the concentric polygonal fan-shaped unit Fresnel lenses (2) are sequentially connected with The fourth side (7) of the regular hexagonal unit Fresnel lens (6) is closely connected, and the second side (4) and the fourth side (7) have the same length. 2. The seven-focus superimposed uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation according to claim 1, characterized in that: the lens surface of the concentric polygonal fan-shaped unit Fresnel lens (2) faces from the inside The third outer arc is a semicircle, and the second side (4) passes through the center of the concentric arc and completely coincides with the chord of the third arc. 3. The seven-focus superimposed uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation according to claim 1, characterized in that: the regular hexagonal unit Fresnel lens (6) and the concentric polygonal sector unit The Fresnel lens (2) is obtained by cutting the point focus Fresnel lens (8).