Shaft seal with in-line sealing rings

Details Shaft seal with in-line sealing rings Shaft seal with in-line sealing rings

1994-05-02

1996-01-02

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 59, F16J 1516, F16J 1540

Patent

active

054801605

ABSTRACT:
A shaft seal (5) for circumferential shaft speeds in excess of 30 m/s and for sealing a differential pressure between two chambers to be sealed, in excess of 100 kP, has several in-line sealing rings (12A, 12B, 20, 22). Preferably, at least two of the high-pressure side seal rings are constructed as slide seal rings (12A, 12B) that are urged against the shaft by a tension spring (17) surrounding the outer circumferential surface of the slide seal rings. One low-pressure side sealing ring is a brush seal (20). A compressed air seal ring (22) is arranged between this brush seal (20) and the slide seal rings (12A, 12B). The air seal ring (22) forms a radial air gap (24) around the shaft (1). In operation of the seal the pressure in the air gap (24) is lower than the pressure in the high-pressure chamber (HD) and higher than the pressure in the low-pressure chamber (ND), whereby a high sealing integrity and resistance to abrasive wear at very high circumferential shaft speeds in excess of 100 m/s and at high differential pressures are maintained.

REFERENCES:
patent: 2908516 (1959-10-01), Stein
patent: 2971783 (1961-02-01), Laser
patent: 3013824 (1961-12-01), Wilson
patent: 3119623 (1964-01-01), Shevchenko
patent: 3172671 (1965-03-01), Downs
patent: 3333856 (1967-08-01), Voitik
patent: 3825270 (1974-07-01), Paramonoff et al.
patent: 3869131 (1975-03-01), Derner
patent: 4421324 (1983-12-01), Yamamoto et al.
patent: 4482158 (1984-11-01), Ishitani et al.
patent: 4756536 (1988-07-01), Belcher
patent: 4984811 (1991-01-01), Kuwabara et al.

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