Mechanical sealing device

Details Mechanical sealing device Mechanical sealing device

2011-08-16

2011-08-16

Bomar, Shane (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

Reexamination Certificate

active

07997583

ABSTRACT:
A mechanical sealing device includes a stationary slide ring, a rotary slide ring which rotary slides and closely contacts the stationary slide ring, an O-ring located between an inner bore of the rotary slide ring and the rotary shaft. An annular ring member has a relatively lower gas permeability than that of the O-ring and is provided in the inner bore of the rotary slide ring so as to adjoin the O-ring at an atmosphere side of the sealing device, wherein the following expression D1<D2<D3is satisfied. D1is a diameter of the rotary shaft, D2is an inner diameter of the annular projected portion of the ring member, and D3is an inner diameter of a portion at the atmosphere side from the ring member in the inner bore of the rotary slide ring.

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