| 摘要 |
PURPOSE:To facilitate operation of removing pre-oxidized film of holes formed in a sealing member at the time of polishing the holes, by making the sealing member from a clad plate of Ni-Cr-Fe alloy and a metal not forming oxide film at the time of preliminary oxidizing process of a glass sealing alloy. CONSTITUTION:A solar heat collector of this invention is constituted by fixing a sealing member 4 for sealing a heat medium transport pipe 3 and the opening end of a glass tube 1 to a heat collecting plate 2 put into the glass tube 1. The sealing member 4 is made of a clad plate of 40-50Ni-3-8Cr-Fe alloy represented, for instance, by 42Ni-6Cr-Fe alloy or 15-30Cr-Fe alloy represented, for instance, by 18Cr-Fe alloy and a metal forming no oxide film at the time of preliminary oxidizing process of a glass sealing alloy. By use of such a sealing member, it is enabled to omit the operation of removing the pre-oxidized film of holes 6 and therefore to improve the quality or reliability of the apparatus. |
