| 摘要 |
PROBLEM TO BE SOLVED: To provide stable measurement accuracy in a hypersensitive analyzer of an object to be cooled by positively preventing influence of minute electric noise caused by movement of a mechanical movable component of a compressor or the like with respect to a cold head, without impairing pressure-proof property and air tightness of a pipe arrangement, a pipe joint, or the like interposed between the compressor and an expander of a pulse pipe refrigerating machine. SOLUTION: An integrated connection joint 35 is formed between a gas passage fixing part 40 and a flange part 42 via an electrical insulating part 41. For example, an opening portion of a gas passage 26b of a wall surface 26a of the expander of the cooling device to which the connection joint 35 will be fixed, is formed such that a rim of the opening portion is positioned on the insulating part 41 when the connection joint 35 is fixed to the wall surface 26a. In connection of the expander and a phase control part via the connection joint 35, the rim of the opening portion of the wall surface 26a becomes an abutting state on the insulating part 41, and the gas passage fixing part 40 and the gas passage 32 become completely electrically insulated states with respect to the wall surface 26a. COPYRIGHT: (C)2007,JPO&INPIT
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