Sunlight concentrating apparatus

Abstract

A sunlight concentrating apparatus includes a plate-like reflecting part, with an upper reflection surface extending in an axial and a width direction, and a lower surface having a central linear region fixed to a main shaft part. A pair of bending mechanisms bend the reflection surface by moving opposite end portions in a central normal direction in accordance with a rotation of the main shaft part. The reflecting part includes a mirror plate and a support plate thereon. In the support plate, the ratio between the distance in the width direction from each end portion in the width direction and the second moment of area at this distance is constant between the end portion and the central linear region, allowing the reflection surface to be bent in an are shape.

Description

TECHNICAL FIELD[0001]The present invention relates to a sunlight concentrating apparatus for concentrating sunlight onto a heat collecting part.BACKGROUND ART[0002]In recent years, solar heat collecting systems that collect solar heat energy by concentrating sunlight and heating a heating medium have been put into practical use. It is important for solar heat collecting systems to efficiently collect the solar heat energy. For example, International Publication No. 2011 / 086825 (Document 1) discloses a technique for, in a sunlight concentrating apparatus that tilts a reflecting mirror in accordance with the movement of the sun, efficiently guiding (reflected light of) sunlight to a heat collecting means by changing the degree of curve of the reflection surface in accordance with the tilting position of the reflecting mirror. More specifically, in the sunlight concentrating apparatus of Document 1, the reflecting mirror is supported at the center, and the degree of curve of the reflec...

AI Technical Summary

Benefits of technology

The present invention provides a device that can efficiently collect sunlight and concentrate it onto a specific area. This is achieved by creating a reflection surface that can bend in a curved shape. Additionally, the reflecting part includes a mirror plate and a support beam that changes in shape along the length of the part to increase its flexibility and rigidity. This results in a more efficient and effective concentration of sunlight.

Problems solved by technology

However, keeping the curvature of the reflection surface substantially constant, i.e., bending the reflection surface in a generally arc shape is not easy, and efficiently guiding the sunlight emitted onto the entire reflection surface to the heat collecting part is difficult.

Document 1 discloses a technique for providing the reflecting mirror with a concave portion to change the rigidity of the reflecting mirror in a transverse cross-sectional direction and thereby changing the degree of curve of the reflecting mirror, but even with this technique, it is not easy to bend the reflection surface in a generally arc shape.

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