| 摘要 |
PURPOSE:To prevent the overheating of the solar heat collector accurately by a method wherein a heat collecting pipe capable of contacting with, and separating from, a heat collecting pipe, a heat collecting member comprising a pair of bimetallic heat collecting plates and a tray-like reflecting mirror are mounted in a high temperature closed pipe so that when a predetermined temperature is reached, the heat collecting plates separate from the heat collecting pipe. CONSTITUTION:The heat collecting member 8 has is upper end fixed to a support member 13 comprising a wire press-fitted in a proper part of the inner surface of the closed outer pipe 6 due to its resiliency. The pair of right and left bimetallic heat collecting plates 8b forming the heat collecting member 8 are coated with black heat discharge films of carbon black or the like on the inner surfaces thereof and each of them has a height suitable for covering the displacement of a black point on the reflecting mirror 11 adopted to follow the displacement of the sun. Further, the inner surfaces of the bimetallic heat collecting plates 8b are usually in contact with the heat collecting plate 8a in a heat conductive manner and the coefficient of thermal expansion of the bimetal of which they are made is so determined that when the heat collecting plate 8a reaches a desired temperature, for example, 200 deg.C, the heat collecting plates separate from the heat collecting pipe 8a. |
