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Japanese Patent JP7138568

B2

[Technical 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 to Problem] 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.

Itaya Sotoshi
Yuki Sasaki
Keiichi Chiba
Kenji Yoshiyanagi
Tetsuzo Okada

JP2018559620A

September 16, 2022

December 27, 2017

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Eagle Industry Co., Ltd.

F16J15/34

JP2005265075A
JP587372U

Kazuo Shigenobu
Yoshifumi Ishikawa
Hideki Akiba
Michihiro Hayashi
Yasushi Amasaka

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