| 摘要 |
PROBLEM TO BE SOLVED: To provide a solar heat collector tube capable of increasing an active area by reducing an incident area of solar heat to be blocked by bellows of thermal expansion difference absorption means as compared with a conventional one.SOLUTION: A solar heat collector tube 11 includes a center metal tube 12 in which a heat medium can be circulated, a glass tube 14 covering an outer periphery of the center metal tube 12 in a state of forming an annular vacuum space 13 between the center metal tube 12 and itself, and metallic thermal expansion difference absorption means 15 for absorbing a thermal expansion difference between the center metal tube 12 and the glass tube 14. The thermal expansion difference absorption means 15 is arranged in a state that two metallic bellows 16-1, 16-2 are arranged in series through a connection cylinder 17 and overlapped in a diameter direction. |
