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1. (WO2018061651) SEAL MECHANISM AND ROTARY MACHINE

Pub. No.:    WO/2018/061651    International Application No.:    PCT/JP2017/031914
Publication Date: Fri Apr 06 01:59:59 CEST 2018 International Filing Date: Wed Sep 06 01:59:59 CEST 2017
IPC: F16J 15/40
F04D 29/10
F04D 29/16
F16J 15/44
F16J 15/447
Applicants: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATION
三菱重工コンプレッサ株式会社
MITSUBISHI HEAVY INDUSTRIES, LTD.
三菱重工業株式会社
Inventors: SABURI Satoshi
佐部利 誠司
TOKUYAMA Shinichiro
得山 伸一郎
Title: SEAL MECHANISM AND ROTARY MACHINE
Abstract:
A seal mechanism (20) is disposed on an outer peripheral side of a rotating shaft (2) that rotates about a central axis (P), and performs sealing with respect to an outer peripheral surface (2a) of the rotating shaft (2). The seal mechanism (20) is provided with: a cylindrical hole pattern seal (21A) that is formed in a cylindrical shape extending in the direction of the central axis (P), that is disposed opposing the outer peripheral surface (2a) of the rotating shaft (2) with a gap (g) therebetween, and in which a reverse swirling flow that contains a swirling component in the opposite direction to the direction of rotation of the rotating shaft (2) flows into the gap from a first end toward a second end in the direction of the central axis (P); and a plurality of holes (22) that are formed in an inner peripheral surface (21a) of the hole pattern seal (21A) so as to be opposed to the outer peripheral surface (2a) of the rotating shaft 2. The depths of the plurality of holes (22) are formed so as to decrease from the first end toward the second end in a gradual or stepwise manner.