JPS6011301B

PURPOSE:To enable to realize airtight sealing with high reliability by a method wherein a sealing between a transparent outer tube and a metallic end plate for sealing the tube is performed simultaneously by high frequency heating and by heating with gas flame at the title collector consisting in sealing the outer tube, in which a heat transfer medium tube made into one body with a heat collecting plate is inserted under the condition that the interior of the outer tube is kept vacuous. CONSTITUTION:The solar heat collector is made by exhausting the air in the transparent outer tube 1 made of glass, in which the heat transfer medium tube 3 integrally attached with the heat collecting plate 2 is housed and the open end of which is closed with the metallic end plate 8, through an exhaust pipe 7. In case of sealingly attaching the metallic end plate 8 to the transparent outer tube 1, the subject sealing part is positioned within a heat insulating cylinder, outside of which a high frequency heating coil 12 is wound, in order to heat the outer periphery of the end plate 8 to a high temperature by high frequency heating. In addition, a gas burner 13 is used at the same time in order to heat the inner periphery of the end plate 8, where the high temperature can not be easily attained to, by high frequency heating. Owing to the heatings as mentioned above, the sealingly attaching of the end plate 8 to the outer tube by heating is performed with high reliability.