| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heat collection pipe capable of holding a getter material on a position not interrupting the light for lighting a heat medium circulation pipe and hardly heated.SOLUTION: A heat collection pipe 10 includes a heat medium circulation pipe 11 capable of circulating a heat medium, a glass tube 13 covering an outer periphery of the heat medium circulation pipe 11 in a state of forming an annular vacuum space 12 with the heat medium circulation pipe 11, a flange 15 disposed on the heat medium circulation pipe 11, bellows 16 as thermal expansion difference absorbing means for absorbing difference in thermal expansions between the heat medium circulation pipe 11 and the glass tube 13, a kovar ring 17, and a getter material 19 adsorbing free hydrogen existing in the annular vacuum space 12. A getter holding portion 20 for storing and holding the getter material 19 is fixed to a supporting portion 18 annularly formed at a side opposed to the heat medium circulation pipe 11 of the flange 15, and the getter holding portion 20 has a slit of a size not allowing the stored getter material 19 to pass therethrough.</p> |
