Spiral groove seal system for high vapor-pressure liquids

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

1987-06-10

1989-12-26

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 63, 277 65, 277 81R, 277 961, F16J 1534

Patent

active

048893480

ABSTRACT:
A seal system is disclosed for sealing a housing and rotatable shaft against leakage of high vapor-pressure liquids. The method of sealing contemplates 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 are of a depth not to exceed about 100 micro-inches. In a preferred form, the depth of the grooves of the upstream module do not exceed 50 micro-inches. The groove depth of the grooves of the downstream module is greater than the depth of the grooves of the upstream module and may be as much as 200 micro-inches.

REFERENCES:
patent: 3499653 (1970-03-01), Gardner
patent: 3704019 (1972-11-01), McHugh
patent: 3811687 (1974-05-01), Honold et al.
patent: 4212475 (1980-07-01), Sedy
patent: 4290611 (1981-09-01), Sedy
patent: 4420162 (1983-12-01), Yanai et al.

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