Spiral groove seal arrangement for high vapor-pressure liquids

Details Spiral groove seal arrangement for high vapor-pressure liquids Spiral groove seal arrangement for high vapor-pressure liquids

1990-07-17

1991-12-10

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 961, 277 81R, 277 93SD, F16J 1534

Patent

active

050711415

ABSTRACT:
A seal system is disclosed for sealing a housing and rotatable shaft against leakage of high vapor-pressure liquids such as natural gas. The method of sealing comtemplates phase change of the liquefied hydrocarbon fluid across a first module. The gas so formed is contained by a second seal module which operates as a dry running gas seal. The seal system has plural, axially spaced spiral-groove seal modules mounted between the shaft and housing. Each seal module has a primary ring affixed to the housing and a mating ring affixed for rotation with the shaft and the modules define an intermediate cavity. The rings have opposed, radially extending faces, one of which has a plurality of downstream pumping spiral grooves extending from one circumference. The grooves of the grooved ring of the upstream module have a pattern which upon shaft rotation creates shear heating of the liquefied hydrocarbon fluid. The pattern has a land/groove surface area ratio greater than one and preferably a ratio of approximately three. The dam portion relative to groove portion surface area is also preferably greater than one and the preferred dam/groove ratio is approximately three.

REFERENCES:
patent: 3527465 (1970-09-01), Guinard
patent: 3704019 (1972-11-01), McHugh
patent: 4212475 (1980-07-01), Sedy
patent: 4889348 (1989-12-01), Amundson et al.

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