Fluid coupling device

Details Fluid coupling device Fluid coupling device

1990-06-18

1991-10-22

Arola, Dave W.

Pipe joints or couplings

Liquid seal

With relative motion

285 14, 285276, F16L 1710

Patent

active

050589270

ABSTRACT:
A fluid coupling device of non-contact type having a stationary main coupling body and a rotary shaft rotatably supported through bearings to the coupling body and formed with an axial fluid passage extending along a length thereof. A minute space is provided at an end portion of the rotary shaft relative to the coupling body, and a pressure reduction chamber is defined beside the minute space for reducing a pressure of fluid leaking thereinto through the first minute space. A second minute space is provided between an outer peripheral surface of the rotary shaft and an inner peripheral surface of the coupling body. The second minute space is in fluid communication with the pressure reduction chamber and is applied with a pneumatic pressure for blocking the bearing against entry of the leaked fluid.

REFERENCES:
patent: 1994169 (1935-03-01), Comins
patent: 3429588 (1969-02-01), Nelson
patent: 3889983 (1975-06-01), Freize
patent: 3957294 (1976-05-01), Hoban
patent: 4253684 (1981-03-01), Tolbert

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