APPARATUS FOR KEEPING LOW TEMPERATURE

摘要

PROBLEM TO BE SOLVED: To provide a highly convenient plug-in structure in which a refrigerating machine can be installed laterally. SOLUTION: A plug-in cylinder 10 is provided with a step 11 and a second cylinder section 13 on the root side is made to have a larger diameter than a first cylinder section 12 on the forward end side. A seal securing part is formed at a heat station 25 and fitted with a cutless ring 29. An annular cut member is fitted over a cylinder 20 to form a seal fixing seat 27. The seal fixing seat 27 is fitted with a cut ring 28 and the gap space 53 between the cylinder 20 and the plug-in cylinder 10 is sectioned into a plurality of small spaces. The gap space 53 is filled with a heat insulating material 26. An interconnecting passage 41 is provided at the flange 40 of a refrigerating machine 7 and coupled with a pipe 44 for discharging nitrogen gas in the gap space 53.