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1. (WO2018124252) MECHANICAL SEAL

Pub. No.:    WO/2018/124252    International Application No.:    PCT/JP2017/047144
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: F16J 15/34
F16J 3/04
F16J 15/52
Inventors: ITADANI Masatoshi
板谷 壮敏
佐々木 祐貴
CHIBA Keiichi
千葉 啓一
吉柳 健二
OKADA Tetsuzo
岡田 哲三
[Problem] To provide a mechanical seal in which, even if a bellows greatly deforms as a result of changes in the relative positions between a rotating ring, which is fixed to a rotating shaft, and a stationary ring, which is fixed to a stationary wall with the bellows interposed therebetween, and a fluid force acts on the bellows in said state, irreversible deformation of the bellows is prevented and the stationary ring follows the movement of the rotating ring, whereby sealing performance can be reliably demonstrated. [Solution] This mechanical seal seals a fluid flowing radially from the inside to the outside of sliding surfaces S where a stationary ring 221 and a rotating ring 211 slide against each other, said stationary ring 221 being fixed to a stationary wall 226 with a bellows 222 interposed therebetween. The mechanical seal comprises: a case member 223 for holding an outer cylindrical part 222c of the bellows 222 to the stationary ring 221; and a holding member 224 fitted to an inner cylindrical part 222a of the bellows 222, and having an axial length that is substantially equal to the fitted length with respect to the inner cylindrical part 222a. The bellows 222 has a curved part 222b between the outer cylindrical part 222c and the inner cylindrical part 222a. The case member 223 is provided with a wall part 223a that covers the entire periphery of the radial outer side of the curved part 222b.