JPS608815A - Dustproof cover for sunshine collector - Google Patents

Abstract

PURPOSE:To prevent dust from sticking to a parabolic reflecting mirror by covering the parabolic reflecting mirror with a dustproof cover which is made of a transparent insulating member and has an external convex surface. CONSTITUTION:The surface of the insulating member is rubbed against wind and charged electrostatically to the positive polarity when planar or concave or to the negative polarity when a convex. Minus charges floating in the air repulse dust charged negatively, so the dust is hard to stick to the convex surface. Consequently, the sticking of the dust to a lens having a planar surface or parabolic reflecting mirror having a concave surface is prevented effectively.

Description

[Detailed Description of the Invention] The present invention is a dustproof cover for protecting the surface of a parabolic reflector or a flat lens from dust etc. in a sunlight collecting device used while being exposed to the atmosphere. The dustproof cover prevents dust from adhering to the surface of the lens having a flat surface or the parabolic reflector having a concave surface, and also prevents dust from adhering to the surface of the dustproof cover.

The applicant first focused the sunlight using a parabolic reflector and introduced it into the optical conductor cable, or used a plane (Fresnel) lens to focus the sunlight and focused the sunlight. The light-receiving end of a light conductor cable is placed at the end of the light conductor cable, sunlight is introduced into the light conductor cable, and the light conductor cable into which sunlight has been introduced in this way is routed to any desired location for lighting or other purposes. Various proposals were made regarding the provision of such materials.

The figure shows an example of concentrating sunlight and introducing it into a light guide using a parabolic reflector. In the figure, 10 is a parabolic reflector for reflecting sunlight L1, and 20 is the parabolic reflector. A reflecting mirror for converting sunlight L2 reflected by the mirror 10 into parallel rays L3 and reflecting the same.
The sunlight L3 reflected by the parabolic reflector 10 is reflected again by the parabolic reflector 10, becomes a focused light L4, and is transmitted to the reflector 30, and is further converted into a focused light or a parallel light beam L5 by the reflector 30. A light receiving end of a light guide cable 40 is disposed at a position facing the reflecting mirror 30, and the sunlight focused as described above is directed to the light guide cable 40.
The light is introduced into the interior and transmitted through the guide cable 40 to any desired location for illumination or other use.

In addition to the above, the applicant has also proposed that sunlight is focused using a large number of flat lenses such as Fresnel lenses, and that the light receiving end of a light conductor cable is arranged at the focal position of each lens, and that the sunlight is focused by the lenses. The present invention also proposed a sunlight collecting device in which sunlight is introduced into the guide cable and transmitted to any desired location through the light guide cable. On the other hand, in the above-mentioned solar light collection device, when dust adheres to the surface of the parabolic reflector or lens, the reflection or transmission of sunlight is obstructed by the dust, resulting in a decrease in sunlight collection efficiency. In order to solve these drawbacks, it would seem that the surface of the reflecting mirror or lens should be covered with a transparent cover. the law of nature! 44 dust accumulates, which is not a solution in the negative direction. On the other hand, the applicant has recently discovered the fact that dust tends to adhere to flat or concave surfaces of insulating members in the atmosphere, and is less likely to adhere to convex surfaces. This is because when the surface of an insulating member is rubbed by wind, if the surface is flat or concave, it will be charged to ten charges, if it is a convex surface, it will be charged to one charge, and this - charge will be This is to repel single-charge dust floating in the atmosphere.

Purpose The present invention has been made to utilize the above-mentioned facts to effectively prevent dust from adhering to a lens forming a flat surface or a parabolic reflecting mirror forming a concave surface.

In the configuration diagram, reference numeral 50 denotes a dustproof cover according to the present invention, and the dustproof cover is made of a transparent insulating member, such as acrylic resin, and is configured so that the outer four surfaces are convex. In this case, this dustproof cover covers the parabolic reflector 10 so as to be convex outward. Therefore, the surface of the parabolic reflector 10 is protected from dust by the dust-proof cover 50, and since dust is less likely to adhere to the outer surface of the dust-proof cover 50 due to the aforementioned fact, sunlight can be efficiently collected. In addition, although the example in which the dustproof cover according to the present invention is applied to a sunlight collecting device using a parabolic reflector is described above, the present invention is not limited to the above embodiment, and the present invention is not limited to the above embodiment. It can also be applied to solar collectors using a Fresnel lens (Fresnel lens) or solar collectors that use sunlight focused by a parabolic reflector or lens as thermal energy.
More generally, it is easy to understand that the present invention can be applied to dustproof covers for any member exposed to the atmosphere.

Effects As is clear from the above explanation, according to the present invention, dust does not adhere to the dustproof cover itself, and therefore, the dustproof cover does not obstruct the transmission of light and allows the sunlight collecting device to be protected from dust. can be prevented from adhesion.

[Brief explanation of the drawing]

The figure is a configuration diagram for explaining one embodiment of the present invention. 10... Parabolic reflecting mirror, 20.30... Reflecting mirror,
40...Light guide, 50...Dustproof cover.

Claims (1)

[Claims] A dustproof cover that is used in a sunlight collecting device having a parabolic reflector or a flat lens for concentrating sunlight and covers the surface of the parabolic reflector or flat lens, the dustproof cover being a transparent insulating member. 1. A dustproof cover for a solar collector, characterized by comprising: a convex surface; and a convex surface.