JPS62225852A - Converging device for sunlight - Google Patents

Abstract

PURPOSE:To converge a large quantity of sunlight with the minimum used material and excellent wind-resistant structure by a method wherein a reflector is composed of flexible material and the both ends of the reflector are supported and stretched loosely so as to form a catenary curve. CONSTITUTION:As for a reflector for sunlight 1, a flexible cloth-like or thin plate-like thing is used and at the reflector cut lines 12 cut out at given intervals are so formed that the whole device is able to resist against strong wind in the same manner as a curtain flaps at the blowing time of strong wind. A sunlight receiving device with excellent heat efficiency is able to be obtained by a method wherein the reflector 11 is so formed in a catenary curve to shape the whole device in a box type and a converging part 15 with minimum area and the reflector having a larger area in comparison with the area of the part 15 are installed without the installation of a sunlight tracking device. An auxiliary reflecting mirror 16 with a flat surface or a necessary curved surface is installed to increase the converging ratio for the sunlight 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a solar light concentrator that collects sunlight and converts it into thermal or electrical energy.

[Conventional technology]

The sun's energy source is inexhaustible, but in order to use this energy effectively, it is necessary to collect the amount necessary for the load, and at the same time, in order to use it as an industrial system, it is necessary to collect it in an especially economical manner. Low cost is necessary and essential.

Figures 4, 5, and 6 show examples of various types of solar collectors in conventional solar collectors, with Figure 4 being a perspective view of a flat plate type solar collector; The figure shows an inverted flat plate type solar collector, and FIG. 6 is a perspective view showing a solar tracking type solar collector having a parabolic gutter-shaped reflective surface. In these figures, 1
2 is sunlight, 2 is a reflecting mirror, 3 is a heat collecting plate, 4 is a heat collecting pipe, 5 is a glass tube that keeps the inside vacuum, 6 is a box body of the heat collector, and 7 is a water pipe.

The flat plate type and inverted flat type solar collectors shown in Figs. 4 and 5 are fixed types, but the flat plate type shown in Fig. 4 does not have the reflecting mirror 2 shown in Fig. 5, and the sunlight 1 is directly collected. A hot plate 3 is heated, the heat is collected by a heat collection pipe 4, and hot water is taken out from a water distribution pipe 7. On the other hand, in the inverted flat plate type shown in FIG. 5, sunlight 1 is reflected by a reflecting mirror 2, and hot water is taken out by a solar collector similar to that shown in FIG. 4 provided at the top. This has a better light-gathering ability than the solar collector shown in Figure 4, and provides higher temperature water. Figure 6 shows a line-focus type solar collector, which uses a parabolic mirror to track the sun, and requires a large light-concentrating area for industrial use. Therefore, the conventional solar light concentrators described above have a box-shaped structure or include a parabolic reflector and a tracking device, making them expensive and not economically viable. requires assembly using small amounts of low-cost materials, i.e., thin plates. However, since our country is frequently attacked by typhoons, it is essential to take measures against strong winds, and there are problems such as the fact that low-cost structures made of thin plates and wind-resistant structures are fundamentally contradictory.

This invention was made to solve the above-mentioned problems.It uses a large-area reflector to improve light-gathering performance, reduces the size of the light-gathering part, stops tracking the sun, and creates a light-gathering part of a certain size. It is designed to be durable, minimize the amount of materials used, take economic efficiency into account, has an excellent wind-resistant structure, is easy to construct, is relatively easy to maintain, and is able to collect more sunlight than conventional products. The purpose of this study is to obtain a solar light condensing device.

[Means for solving problems]

In the solar light condensing device according to the present invention, the reflector is formed of a flexible material, and the reflector is loosely stretched with both ends supported so as to form a catenary curve.

[Effect]

In this invention, the reflector is blown against the wind like a curtain, so it can withstand strong winds, and since it forms a catenary curve, it has high light-gathering properties.

〔Example〕

Figures 1(a), (b), and (c) show an embodiment of the present invention, with Figure 1(a) being a perspective view, Figure 1(b) being a side sectional view, and Figure 1(b) being a side sectional view. (c) is a side sectional view showing a case where a solar cell is provided in the light receiving section. In these figures, 1 indicates sunlight, and 11 is a reflector for the sunlight 1, which is in the form of a cloth or a thin plate. 12 are cuts cut at required intervals in the reflector 11; 13.14
15 is the flow of air passing through the cut 12; 15 is a light collecting section that collects the sunlight 1 reflected by the reflector 11;
17 is an auxiliary reflecting mirror provided in the light collecting section 15 and equipped with heat collecting fins for converting the sunlight 1 into heat. The heat collecting pipe 18 may be the tubular pipe described above.

The solar light condensing device of the present invention does not use a parabola or an arc for the curve formed by the reflector 11, and when both ends of the thread or cloth are supported by two points or two lines, when the string or cloth is in a naturally hanging state. Use a catenary curve (perpendicular line) formed by

This is the same curve as the catenary curve formed by the electric wire 32 loosely stretched over a high-voltage steel tower 31, as shown in FIG.

By forming one reflector 11 with a catenary curve in this way, it is possible to form the entire device into a box shape or to provide a sun tracking device, and to create a light condensing section 15 with a minimum area and an area of the condensing section 15. With the reflector 11 having a large area compared to the solar light receiving device, a solar light receiving device with good thermal efficiency can be obtained.

Also, since the reflector 11 is flexible, and the reflector 11
By forming the cuts 12 in the windshield, the whole device can withstand strong winds by being fanned like a curtain.

FIG. 3 is a detailed ray tracing diagram when the incident angle of sunlight 1 is 30'', and the amount of sunlight 1 received by the condensing section 15 can be approximately doubled.

〔Effect of the invention〕

As explained above, in the present invention, the reflector is made of a flexible material, and the reflector is supported at both ends to form a catenary curve and is stretched loosely, so that the light receiving section is As a result, the amount of sunlight collected increases, and the heat collecting section or the light receiving section can be made smaller. Therefore, when collecting heat, there is less heat loss and thermal efficiency increases. Furthermore, when receiving light, solar cells can be used effectively. Furthermore, since the wind resistance is improved and the weight can be reduced, manufacturing and assembly are easy, maintenance is also easy, and manufacturing costs and maintenance expenses can be reduced.

[Brief explanation of drawings]

Figures 1(a), (b), and (C) show one embodiment of the present invention, with Figure 1(a) being a perspective view, Figure 1(b) being a side sectional view, and Figure 1(b) being a side sectional view. (c) is a side cross-sectional view showing the case where a solar cell is provided in the light concentrator, FIG. 2 is an explanatory diagram of a catenary curve, and FIG. 3 is a ray tracing diagram when using the solar light concentrator of this invention. , FIG. 4, FIG. 5, and FIG. 6 are perspective views showing various examples of conventional solar collectors. It's a battery. Figure 1 (a) Figure 1 (C) Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A solar light concentrating device comprising a reflector having a reflective surface that reflects sunlight and a condensing section that condenses the sunlight reflected by the reflector, wherein the reflector is flexible. 1. A solar light concentrator, characterized in that the reflector is made of a material and is loosely stretched while being supported at both ends of the reflector so as to form a catenary curve.