Turbo-type fluid machine and a stepped seal apparatus to be...

Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Between blade supported radial tip ring and static part

Reexamination Certificate

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Details

C415S171100, C415S174400, C415S174500

Reexamination Certificate

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11174501

ABSTRACT:
A turbo-type fluid machine comprises a mouth ring part provided between a shroud of an impeller and a pump casing and having a seal function. The mouth ring part comprises an impeller ring on a side of the shroud of the impeller and a casing ring provided on a side of a non-rotating body wall surface of the casing. The impeller ring is structured to have a stepped portion that is in the form of a staircase with at least two steps to be small in diameter toward a suction side of the impeller and large in diameter toward an outlet of the impeller. The casing ring is labyrinth-shaped to comprise a projection and a recess. A narrow clearance part having a narrow radial clearance is formed between the projection and the impeller ring. A flow passage spatial portion defining an enlarged portion of the narrow radial clearance is formed by the recess and the stepped portion of the impeller ring.

REFERENCES:
patent: 1020699 (1912-03-01), Kieser
patent: 3231285 (1966-01-01), Weltmer et al.
patent: 3516757 (1970-06-01), Baumann
patent: 4286919 (1981-09-01), Yamaguchi
patent: 5639095 (1997-06-01), Rhode
patent: A-11-343996 (1999-12-01), None

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