Dynamic seal arrangement for impeller pump

Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Resilient – flexible – or resiliently biased

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Details

4151711, 277 961, 277 93SD, F04D 2914

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048849456

ABSTRACT:
An impeller pump including a housing defining a seal cavity having a shaft rotatably mounted therein, and an expeller to pump fluid from the seal cavity. A dynamic seal provides a fluid tight seal between the housing and the shaft. The seal comprises an axially movable primary seal ring which rotates with the shaft and a mating stationary seal ring, both rings disposed annularly of the shaft and each defining a generally radial sealing face adapted to seal against the other. A biasing device urges the primary seal ring into sealing engagement with the mating seal ring. The radial face of the mating seal ring defines a plurality of spiral grooves and a sealing dam area which is at the periphery of the ring exposed to high pressure. When the pump is not operating, the seal ring faces contact one another and the dam provides a seal against the opposing face. When the pump is operating, the primary seal ring rotates with the shaft and the grooves create a pumping action to pump air between the faces causing the primary seal ring to lift away from the mating seal ring to prevent wear and avoid undue heat generation.

REFERENCES:
patent: 2258527 (1941-10-01), Warham
patent: 3068801 (1962-12-01), Murray
patent: 3395645 (1968-08-01), Vilet
patent: 4212475 (1980-07-01), Sedy
patent: 4290611 (1981-09-01), Sedy

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