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1. (WO2016052298) OIL-FREE SCREW COMPRESSOR

Pub. No.:    WO/2016/052298    International Application No.:    PCT/JP2015/076917
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Fri Sep 25 01:59:59 CEST 2015
IPC: F04C 18/16
F04C 27/00
F04C 29/00
Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
株式会社神戸製鋼所
Inventors: MIYATAKE, Toshiyuki
宮武 利幸
Title: OIL-FREE SCREW COMPRESSOR
Abstract:
 An oil-free screw compressor having: a screw rotor provided with a screw part and a shaft part; a bearing for supporting the shaft part; a first seal part disposed between the screw part and the bearing, the first seal part facing the shaft part; a first shaft-sealing device provided with a first communication part that allows communication for an outer peripheral surface and the bearing side in relation to the space between the shaft part and the first seal part; a second seal part disposed between the first shaft-sealing device and the bearing, the second seal part facing the shaft part; and a second shaft-sealing device provided with a second communication part that allows communication for the outer peripheral surface and the screw part side in relation to the space between the shaft part and the second seal part. The casing is provided with an atmosphere communication part connected to both the first and second communication parts at the inner peripheral surface of the shaft housing space of the casing, the atmosphere communication part communicating the first and second communication parts with the atmosphere.