Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1977-01-21
1977-12-27
Ward, Jr., Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 25, 277 27, 277 74, 277168, F16J 1542
Patent
active
040651363
ABSTRACT:
A shaft seal assembly for a rotary machine includes a breakdown bushing having a close running fit with the outer periphery of the shaft of the rotary machine for throttling sealing fluid moving from a high pressure fluid injection region to a first region of lower pressure. The breakdown bushing includes an axially extending step-like portion of constant diameter spaced from the outer periphery of the shaft and disposed immediately adjacent to the fluid injection region to restrict the flow of fluid moving from the injection region. The restricted fluid develops a radially acting hydrostatic force on the surface of the step-like portion to move said seal member radially outward with respect to the shaft. An annular seal ring is integrally connected to said breakdown bushing to prevent the working fluid from escaping into a second low pressure region. The center of gravity of the seal assembly is positioned radially above the center of the step-like portion whereby the radially acting hydrostatic force acts in opposition to the radially acting force generated by the weight of the seal assembly to radially center the seal member with respect to the shaft.
REFERENCES:
patent: 3062554 (1962-11-01), McGahan et al.
patent: 3127181 (1964-03-01), Crego et al.
patent: 3155393 (1964-11-01), Hummer
patent: 3533635 (1970-10-01), Godin et al.
patent: 3575424 (1971-04-01), Taschenberg
patent: 3606350 (1971-09-01), Gravelle
patent: 3679217 (1972-07-01), Lesiecki
patent: 3724861 (1973-04-01), Lesiecki
patent: 3756673 (1973-09-01), Strub
patent: 3997175 (1976-12-01), Geary
Geary Carl H.
Miller, Jr. William H.
Carrier Corporation
Curtin J. Raymond
Deutsch Barry E.
Ward, Jr. Robert S.
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