Sealing device for the emergent shaft end of a rotating machine

Details Sealing device for the emergent shaft end of a rotating machine Sealing device for the emergent shaft end of a rotating machine

1977-02-08

1978-05-02

Ross, Herbert F.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 65, 277 76, 277 83, F16J 1540

Patent

active

040870979

ABSTRACT:
The device comprises a first dry seal and an admission chamber for controlled leakage of a neutral barrier gas at a pressure of slightly higher value than the pressure of the hazardous gas which is thus prevented from passing through the seal. The pressure difference across the first seal is maintained at a low and constant value by an external regulator. A second seal closes the admission chamber and is supplied with barrier gas at a pressure of higher value than the pressure of the external atmosphere. Leakage of the barrier gas from the second seal is discharged along with any leakage of hazardous gas through the first seal into an external recovery circuit. The leakage of barrier gas from the admission chamber is into an adjacent compartment defined by the second seal and by a floating ring which produces a pressure drop so as to prevent the external atmosphere from penetrating into the compartment.

REFERENCES:
patent: 3035841 (1962-05-01), Riester
patent: 3880434 (1975-04-01), Echard et al.
patent: 3921986 (1975-11-01), Geary
patent: 3951417 (1976-04-01), Cheruykh

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