JPS61165702A - Solar generator - Google Patents

Abstract

PURPOSE:To obtain an efficient solar condenser with a low cost by making plural reflecting plates in curvature from one another and combining and arranging reflecting plates having lower curvatures on the inside of the reflecting plate having a high curvature combining these reflecting plates into such shape that the sunlight is reflected and condensed between insides and outsides of reflecting plates adjacent to one another. CONSTITUTION:The sunlight is made incident through a transparent plate 2 in accordance with an optical path 1. A main reflecting plate 3A and auxiliary reflecting plates 3B are provided as reflecting plates of the sunlight, and a solar battery 4 is provided on a supporting structure body 5. In the aperture part of the reflecting plate 3A having the highest curvature, reflecting plates 3B, 3C, and 3D whose curvature is reduced successively are supported on the axial line of the reflecting plate 3A by a glass supporting bar 9 while keeping proper intervals. Surfaces facing one another of individual reflecting plates are formed to reflecting surfaces, and the supporting structure body 5 of the solar battery 4 is provided with a heat pump 8 as a cooling means.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solar power generation device equipped with multiple solar reflectors. □ [Summary] The present invention consists of reflecting plates having a plurality of aperture cross sections with different curvatures, with the larger curvature facing outward, and the smaller curvatures being sequentially combined on the same axis, so that they are mutually aligned. This relates to a solar power generation device having a light condensing means provided with reflective surfaces on opposing parts, and includes a cooling means to prevent local overheating of the solar cells.

[Conventional technology]

Conventionally, this type of device uses an internal light condensing method using a reflector as shown in FIG. 3, an external light condensing method shown in FIG. 4, or a single reflector as shown in FIG. Light was focused by a lens.

[Problem that the invention seeks to solve]

However, in the case of Figures 3 and 4, the curvature accuracy and surface accuracy of the reflector are required to be quite strict, so the manufacturing cost is high, and a sunlight tracking device is required to focus the light. is required. In addition, condensing light using the lens shown in Figure 5 requires strict curvature accuracy and surface accuracy of the glass lens or plastic lens as described above, increases weight, and requires a sunlight tracking device, which reduces equipment costs and operation. It had the disadvantage of being expensive.

The present invention solves this drawback, and aims to provide an economical solar power generation device that has good light collection efficiency, does not require a tracking device, and can be manufactured with poor precision.

[Means for solving problems]

The present invention provides a solar power generation device comprising a condensing means for concentrating sunlight and a solar cell arranged at a position where the condensing means collects the sunlight and irradiates the sunlight. has a cross-sectional structure that opens toward the sun and has a plurality of reflecting plates each having a convex curved surface on the outside, and each of the plurality of reflecting plates has a different curvature. The combined shape of each reflecting plate is such that sunlight is reflected and concentrated between the inside and outside of the adjacent reflecting plates.

Preferably, a plurality of solar cells are arranged, and the solar cells include a common cooling means.

[For production]

If a plurality of reflectors having reflective surfaces on both sides with a smaller curvature are piled up inside the reflector with the largest curvature and are stacked at appropriate intervals, the light incident through the gap at the end Even if sunlight is reflected upward, it is reflected back on the outer reflective surface of the sub-reflector located further above, so that it is successively focused on the center of the reflector where the curvature is the largest. Therefore, it is not necessarily necessary to make the aperture directions of these reflectors track in the direction of sunlight. Furthermore, if a cooling means is used, there is no risk of damage to the solar cells even if heat builds up in the center of the light collection.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of an embodiment of the present invention, in which a light path 1 is transmitted through a sunlight transparent plate 2 and is incident thereon. The sunlight reflecting plate is composed of a main reflecting plate 3A and a sub-reflecting plate 3B, and the solar cell 4
are provided on the support structure 5.

FIG. 2 is an enlarged view of FIG. 1.

Here, the features of the present invention are as shown in FIG.
Inside the opening of the reflecting plate 3A having the largest curvature, reflecting plates 3B and 3C13D having successively smaller curvatures are supported by a glass support rod 9 approximately on the axis of the reflecting plate 3A while maintaining appropriate intervals, respectively. Further, the opposing surfaces of the respective reflectors are reflective surfaces, and the support structure 5 for the solar cell 4 is provided with a heat pump 8 serving as a cooling means.

This is because sunlight entering from the direction of the optical path 1 is repeatedly reflected by the multi-layered reflecting plates 3A and 3B, and is focused and incident on the solar cell 4. Since the solar cell portion is locally heated by this concentrated light, the inside of the support structure 5 is used as a cooling tank, so the temperature is averaged by mounting a heat pipe 8, and the temperature of the solar cell 4 is Try to maintain conversion efficiency.

With the above structure, ■ A sunlight tracking device is unnecessary or the accuracy may be poor. ■ The curvature accuracy and surface accuracy of each reflector may be rough. ■ Local heating by condensing light can be performed using a heat pump. It averages out the temperature and suppresses temperature rise, so the electricity conversion efficiency of solar cells can be maintained, and ■ By increasing the light collection rate, large amounts of power can be obtained.

As shown in FIG. 2, the reflector 3A can be used as an omnidirectional type up to the incident angle by determining multiple reflector envelopes based on the incident angle θ of the received sunlight.

Each of the reflecting plates 3A, 3B, etc. may be of any shape such as a hemisphere, a square pyramid, or a rain gutter, and it is easy to increase the light collection rate to several tens of times. As an example of a configuration of a reflector plate with reflective surfaces on both sides, if transparent Teflon is coated on both sides of an aluminum foil, the sunlight reflectance on both sides will be increased, and the infrared radiation rate for heat dissipation will also be increased. .

In this example, the number of multiplexed reflectors was set to four, but
The present invention is not limited to this.

〔Effect of the invention〕

As explained above, the number of required solar cell elements can be significantly reduced compared to the conventional non-concentrating flat plate type, and manufacturing costs can be reduced. A device equipped with a heat pump to avoid high temperatures due to concentrated light has the advantage of being able to utilize thermal energy other than the energy electrically converted by solar cells (approximately 10 to 15%).

In addition, since concave reflectors are arranged in multiple layers, there is no need to strictly finish the surface accuracy of the curvature radius of the reflector, so manufacturing costs are low. There is an advantage that θ can be selected and used. That is, by implementing the present invention, there is an effect that a highly efficient solar light concentrating device can be realized at a low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention. Figure 2 is an enlarged view of Figure 1. FIG. 3 is a cross-sectional view of a conventional internal condensing type example. FIG. 4 is a cross-sectional view of a conventional example of external condensing type. FIG. 5 is a sectional view of a conventional lens condensing type example. l... Optical path, 2... Solar light transparent plate, 3.3A, 3B
, 3C13D...reflector, 4...solar cell, 5...
・Support structure, 6... Support rod, 7... Condensing lens,
8...Heat pump, 9...Glass support rod, θ...
・Sunlight incident angle.

Claims (2)

[Claims] (1) In a solar power generation device comprising a concentrating means for concentrating sunlight, and a solar cell arranged at a position where the condensing means collects the sunlight and irradiates the sunlight, the concentrating means , whose cross-sectional structure opens toward the sun and includes a plurality of reflecting plates each having a convex curved surface on the outside, and each of the plurality of reflecting plates has a different curvature. 1. A solar power generation device characterized in that small reflectors are arranged in combination, and the combined shape of each reflector is such that sunlight is reflected and concentrated between the inner and outer sides of adjacent reflectors. (2) A plurality of solar cells are arranged, This solar cell includes common cooling means A solar power generation device according to claim (1).