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1. (WO2015115300) NONCONTACT ANNULAR SEAL AND ROTATING MACHINE EQUIPPED WITH SAME

Pub. No.:    WO/2015/115300    International Application No.:    PCT/JP2015/051656
Publication Date: Fri Aug 07 01:59:59 CEST 2015 International Filing Date: Fri Jan 23 00:59:59 CET 2015
IPC: F16J 15/44
F04D 29/08
F04D 29/16
F16J 15/447
Applicants: EBARA CORPORATION
株式会社荏原製作所
Inventors: WATANABE, Yusuke
渡邊 裕輔
Title: NONCONTACT ANNULAR SEAL AND ROTATING MACHINE EQUIPPED WITH SAME
Abstract:
Provided is a noncontact annular seal that reduces the amount of leakage resulting when the lead angle is increased in order to increase the pumping effect; also provided is a rotating machine equipped with this seal. The noncontact annular seal is for sealing a fluid that flows from the high-pressure side to the low-pressure side in a gap between a rotating body and a stationary body, with a thread groove provided in the surface of the rotating body or the surface of the stationary body between which the gap is formed. The thread groove has a region wherein the cross-sectional area of the thread groove on the low-pressure side is smaller than the cross-sectional area of the thread groove on the high-pressure side. The rotating machine has this noncontact annular seal.