| 摘要 |
PROBLEM TO BE SOLVED: To provide a solar heat collection tube capable of enlarging an active area.SOLUTION: A diameter of each of a plurality of mountain fold formed portions 4a of a bellows 4 decreases in a tapered fashion toward an end portion 3a of a heat medium circulation tube 3. Likewise, a diameter of each of a plurality of valley fold formed portions 4b decreases in a tapered fashion toward the end portion of the heat medium circulation tube 3. Namely, each mountain fold formed portion 4a is formed to be located at a position that is deviated from the adjacent mountain folded portion 4a in a radial direction of the bellows 4 and that is a generally intermediate position (in an intermediate portion) between the adjacent mountain fold formed portion 4a and the adjacent valley fold formed portion 4b. Likewise, each valley fold formed portion 4b is formed to be located at a position that is deviated from the adjacent valley fold formed portion 4b in the radial direction of the bellows 4 and that is in the intermediate portion between the adjacent mountain fold formed portion 4a and the adjacent valley fold formed portion 4b.SELECTED DRAWING: Figure 2 |
