VACUUM DOUBLE PIPE, AND CONNECTED STRUCTURE OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a vacuum double pipe and the connected structure of the same, achieving a reduction in weight while ensuring strength and also reducing the time and labor required to evacuate the vacuum double pipe.SOLUTION: The inner pipe 31 of the vacuum double pipe 30 is covered with an outer pipe 41, and an evacuation passage 37 is formed by a space between the inner pipe 31 and outer pipe 41. The evacuation passage 37 is open at both ends in the extension direction of the inner pipe 31 and sealed between both the ends. A plurality of annular node portions 38, 48 are formed at intervals in the inner pipe body 32 of the inner pipe 31 and the outer pipe body 42 of the outer pipe 41 by bending the pipe walls thereof to project outwardly in a radial direction.