Shaft sealing device utilizing a non-uniform groove depth

Details Shaft sealing device utilizing a non-uniform groove depth Shaft sealing device utilizing a non-uniform groove depth

1980-12-01

1983-01-18

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 15, 277 53, 277 59, 277 3, F16J 1540, F16J 1544

Patent

active

043688950

ABSTRACT:
A shaft sealing device stable in sealing effect and which causes no seal breakdown is provided by changing the groove depth of a thread cut in a rotary shaft in the axial direction in such a manner that the groove depth of the thread on the high liquid pressure side is larger than that on the low liquid pressure side. In one embodiment, the groove depth on the high pressure side is larger than on the low pressure side of the thread with the groove depth varying continuously from the high pressure side to the low pressure side. In another embodiment, the groove depth is constant in a portion of the shaft on the low pressure side and decreases towards the low pressure in a portion of the shaft on the high pressure side.

REFERENCES:
patent: 3131942 (1964-05-01), Ertaud
patent: 3360272 (1967-12-01), Blom et al.
patent: 3558238 (1971-01-01), Van Herpt
patent: 3746350 (1973-07-01), Mayer et al.
patent: 3906730 (1975-09-01), Bellati et al.
patent: 3909012 (1975-09-01), Denis
patent: 3942803 (1976-03-01), Wijnout et al.
Windback Seals-"A Simple Theory and Design Method and the Main Practical Limitations" by A. B. Crease in the Proceedings of the 7th International Conference on Fluid Sealing of Sep. 24-26, 1975, Paper H1, pp. H1-1 thru H1-20, BHRA Fluid Engineering, Cranfield, Bedford, England.

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