WHEEL TYPE TRANSPORT DEVICE, DRIVING DEVICE AND ROTARY SHAFT SEAL MECHANISM

摘要

PROBLEM TO BE SOLVED: To provide a wheel type transport device, etc. for exhibiting a sure seal effect relative to a highly permeable corrosive fluid and gas including peracetic acid. SOLUTION: In addition to an oil seal 40, oil seals 41, 42 are used for forming a three layer seal structure. A space B between the oil seal 40 and 41 is open to the atmosphere for reaching atmospheric pressure and for generating a pressure difference relative to a sterile environmental area A. A liquid such as oil is supplied to a space C between the oil seals 41, 42. Dry air is supplied between the oil seal 42 and a bearing 28. COPYRIGHT: (C)2007,JPO&INPIT