| 摘要 |
PROBLEM TO BE SOLVED: To provide the joint of a vacuum double pipe and the connected structure of the vacuum double pipe, suppressing deterioration of thermal insulation property and also reducing labor required to evacuate the vacuum double pipe.SOLUTION: Vacuum double pipes having outer pipes covering inner pipes and evacuating portions between the inner pipes and outer pipes are connected to each other through L-shaped joints 50. The L-shaped joints 50 include: inner pipe joint portions 51 having inner pipe joint portions 53 respectively connected to the inner pipes, allowing the flow passages of the inner pipes to communicate with each other, and also having closed midway portions between the inner pipe joint portions 53; and outer pipe joint portions 61 covering the inner pipe joint portions 51 and also having outer pipe connecting portions 63 connected to the outer pipes. Evacuation passages 55 are formed by spaces between the inner pipe joint portions 51 and outer pipe joint portions 61. The spaces between the inner pipes and outer pipes are allowed to communicate with each other through the evacuation passages 55, and also midway portions between the outer pipe connecting portions 63 are tightly closed. |
