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PROBLEM TO BE SOLVED: To surely prevent a working mixed gas in an operating chamber from leaking into a driving chamber, and also to suppress the lowering of its refrigerating capacity by installing a rod sealing device and a gas sealing device as a sealing means of a rod extending as piercing through a partitioning member, and interposing an intermediate chamber communicating to the driving chamber, between both these sealing devices.
SOLUTION: A Stirling refrigerating unit as a gas compression expander is provided with an operating chamber fitted with a compression piston (or a displacer) 7 connected to one end of a piston rod (hereinafter referred to as a rod) 22. In addition, a piston driving mechanism fitted in a driving chamber 12 is connected to the other end of the rod 22, therefore this compression piston 7 is reciprocated by this driving mechanism. Here a rod sealing device 93 preventing any lubricating oil in the driving chamber 12 from penetrating into the operating chamber 21 and a gas sealing device 94 preventing any working mixture in this operating chamber 21 from penetrating into an intermediate chamber 91 both are installed in a partition part 9 partitioning off the operating chamber 21 and the driving chamber 12 where the rod 22 is pierced through, and then the intermediate chamber 91 is interconnected to the driving chamber 12 via a filter 97.
COPYRIGHT: (C)1999,JPO
【課題】 装置の長寿命化を図ると共に、作動室内の作 動ガスが駆動室へ漏出するのを極力抑制して装置の冷凍 能力低下を防止する。
【解決手段】 作動室２１と、駆動室１２と、ロッド２ ２が貫通し、作動室２１と駆動室１２とを仕切る仕切部 ８，９と、を備え、仕切部８，９は、駆動室１２から作 動室２１へ向かう方向の流れに対してのシール性がその 逆の流れに対するシール性より高いシール部材から成る ロッドシール装置９３と、該ロッドシール装置９３の作 動室２１側に設けられた中間室９１と、該中間室９１の 作動室２１側に設けられたガスシール装置９５と、中間 室９１及び駆動室１２を、中間室９１及び駆動室１２の 圧力差が一定値以上の場合に作動ガスの移動を許容する 開閉手段９８と潤滑油除去部材９７を介して連通させる 連通手段９６とを備える。
