| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heat insulating vacuum double pipe excellent in heat insulation property to be suited for transporting fluid of high temperature. SOLUTION: This double pipe comprises an inner/outer pipe 1, 2 holding a fixed space on an coaxial shaft, the inner pipe 1 is formed with a connection part 1b protruded from an end part 2a of the outer pipe 2, on a peripheral surface of this inner pipe 1, a radiation heat reflecting sheet 6 is laminated to be coated, as a shield wall connecting the inner/outer pipe 1, 2, a stainless steel-made bellows 5 is arranged, a space between the inner/outer pipes 1, 2 is placed in a sealed condition, a vacuum is formed by an air vent valve 4. In a joint structure of two sets of this heat insulating vacuum double pipe, the connection part 1b of the inner pipe 1 of two sets of the heat insulating vacuum double pipe is seal connected, between a joint pipe 3 holding a fixed space coaxially to the inner pipe 1 and the outer pipe 2 of two sets of the heat insulating vacuum double pipe is seal connected, a space between the inner pipe 1 and the joint pipe 3 is placed in a seal condition, a vacuum is formed by the air vent valve 4.</p> |
