(EN)
A piston rod (22) is provided slidably through a partition wall (19) between a behind-piston space (21) and a crank case (12). A sealing device (9) surrounding the piston rod (22) comprises a first sealing member (93) having a high sealing capability against a flow from the crank case (12) to the behind-piston space (21), an intermediate chamber (91) provided on the behind-piston space side of the first sealing member (93), a communication passage (96) for communication between the intermediate chamber (91) and the crank case (12), and an oil filter (97) provided at a portion of the communication passage (96). This arrangement not only extends the service life of the sealing device but also prevents the refrigerating capacity of the gas compressor-expander from being lowered.
(ZH) 一种气体压缩/膨胀机,在夹装在活塞背面空间(21)与曲柄室(12)之间的隔壁(19)上安装有可滑动地贯通活塞连杆(22)并包围该活塞连杆(22)的密封装置(9)。该密封装置(9)具有:从曲柄室(12)向活塞背面空间(21)流动的有较高密封性的第1密封构件(93);设在中间室(91)的活塞背面空间侧的第2密封构件(95);使中间室(91)与曲柄室(12)互相连通的连通道(96);夹装在连通道(96)途中的滤油器(97)。由此,可获得密封装置的长寿命化,并可防止气体压缩/膨胀机的制冷能力的下降。