F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
277/12, 64/8
F16J 15/34 (2006.01) F04D 29/12 (2006.01)
Patent
CA 1300186
Abstract of The Disclosure A seal system is disclosed for sealing a hous- ing 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 pre- ferred 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 no less than the depth of the grooves of the upstream module and may be as much as 200 micro-inches.
569285
Amundson Donald Earl
Hamaker Jon Burnett
Pecht Glenn G.
Sedy Josef
John Crane Inc.
Mcfadden Fincham
LandOfFree
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