Liquid-flushed seal for rotating shaft with vacuum providing lea

Details Liquid-flushed seal for rotating shaft with vacuum providing lea Liquid-flushed seal for rotating shaft with vacuum providing lea

1991-01-15

1991-12-17

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 71, 277 72R, 277 81R, F16J 1534, F16J 1540

Patent

active

050729497

ABSTRACT:
The invention relates to an arrangement in a mechanical seal. The mechanical seal comprises a seal member to be attached to a rotating machine part and provided with a slide ring; and a static seal member to be attached to a stationary machine part and provided with a slide ring. The mechanical seal further comprises connections for supplying flushing liquid to the seal and for discharging it from the seal; and a secondary seal arranged to seal the gap between the rotating machine part and the static seal member. In order to achieve a simple seal reliable in operation, a choke is formed in the flow conduit of the supply connection for flushing liquid, the choke communicating by means of a suction connection with a space receiving the flushing liquid leaking across the secondary seal. The flushing liquid flowing in the supply connection creates, in a manner known per se, a vacuum in the choke, which vacuum is arranged to suck the flushing liquid leaking across the secondary seal through the suction connection into the supply connection.

REFERENCES:
patent: 3356378 (1967-12-01), Tracy
patent: 4245844 (1981-01-01), Pohl et al.
patent: 4538821 (1985-09-01), Wallace

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