Solar heat collection apparatus

Abstract

A solar heat collection apparatus heats a heating medium flowing through a heat collecting tube by collecting sunlight in the heat collecting tube using a curved surface mirror. The heat collecting tube includes an inner tube through which the heating medium flows, an outer tube provided on an outer side of the inner tube, and a bellows, a flange, and a cylinder member connecting the inner tube to the outer tube. An insulating space is formed between the inner tube and the outer tube, and an exhaust hole that communicates with the insulating space is formed in the flange. The exhaust hole is sealed by a sealing member welded to the flange. As a result, damage to the outer tube can be prevented, and heat collecting tubes can be more easily connected to each other in the lengthwise direction.

1 - 3 . (canceled) 
     
     
         4 . A solar heat collection apparatus that heats a heating medium flowing through a heat collecting tube by collecting sunlight in the heat collecting tube using light collecting means,
 characterized in that the heat collecting tube comprises:
 an inner tube through which the heating medium flows; 
 an outer tube provided on an outer side of the inner tube; and 
 a connecting member connecting the inner tube to the outer tube, 
   an insulating space is formed between the inner tube and the outer tube,   an exhaust hole that communicates with the insulating space is formed in the connecting member, and   the exhaust hole is sealed by a sealing member welded to the connecting member.   
     
     
         5 . The solar heat collection apparatus according to  claim 4 , characterized in that the connecting member includes a flange connected to the inner tube and a stress relaxing member provided between the flange and the outer tube, with
 the exhaust hole being formed in the flange.   
     
     
         6 . The solar heat collection apparatus according to  claim 4 , characterized in that the sealing member is welded to the connecting member by friction welding.