| 摘要 |
PURPOSE:To prevent a heat collecting plate from extraordinary rise in temperature due to the heating without water by a method wherein a heat collecting plate formed freely liftable is provided at downward of a sun light permeable body, and the heat collecting plate is automatically ascended and descended by the operation of a temperature detecting element. CONSTITUTION:A heat collecting pipe 2 in a heat collector having a sun light permeable body 1 on a upper surface of said body 1 is formed as freely liftable, while, a bimetal 9 as temperature detecting element is contacted on a part of under-surface of the heat collecting plate 2. At an operation, a heating medium 6 is introduced into the heat collecting plate 2 through an inlet port 5, exhausted from a outlet port 7 after heated by solar heat. In this state, the temperature of the heat collecting plate 2 and surrounding atmosphere of said plate 2 is made lower than 100 deg.C, consequently, the bimetal 9 is not operated. Meanwhile, when the heating without water is performed, said plate 2 is risen extraordinary in temperature by the sunshine because the heating medium 6 is not filled up inside of the heat collecting plate 2. Thereby, said plate 2 is pushed up due to the expansion of the bimetal 9, the heat of said plate 2 is dissipated through the light permeable body 1, accordingly, said plate 2 is lowered in temperature.
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