Circumferential inter-seal for sealing between relatively rotata

Details Circumferential inter-seal for sealing between relatively rotata Circumferential inter-seal for sealing between relatively rotata

1988-11-01

1990-11-27

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 27, 277 961, 277133, 277173, F16J 1540, F16J 1534, F16J 900

Patent

active

049729861

ABSTRACT:
A seal assembly between a rotatable hollow outer shaft and a rotatable inner shaft for sealing a high pressure fluid reservoir from a low pressure fluid reservoir. Axially spaced radially extending first and second runners are attached to the inner shaft. An annular seal ring surrounds and is radially spaced from the inner shaft and disposed between the runners. Fluid flow from the high pressure reservoir to the low pressure reservoir in a path defined by spaces formed between the seal ring and the shafts and runners, and axially through passages in the seal ring. The hydrostatic forces imposed on the seal ring tend to maintain it in its proper position. Radially extending grooves are machined in the opposed surfaces of the runners generating a hydrodynamic lift force between the seal ring and runners proportionate to relative rotation between the shafts, for axially sliding the seal ring relative to the outer shaft in response to relative axial movement between the shafts and for maintaining the flow of fluid and preventing rubbing contact between the seal ring and the runners.

REFERENCES:
patent: 3315968 (1967-04-01), Hanlon

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