Differentially-pumped ferrofluidic seal

Details Differentially-pumped ferrofluidic seal Differentially-pumped ferrofluidic seal

1992-06-22

1994-08-23

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 80, 378 93, 378101, 378123, 378125, F16J 1540

Patent

active

053401220

ABSTRACT:
A ferrofluidic seal arrangement for sealing a high-speed rotary shaft which passes between an environment at atmospheric or high pressure and an environment at high-vacuum is provided, which is especially useful in a high-speed rotating anode apparatus for generating x-rays in a CAT Scan apparatus or the like. A differentially-pumped region between a multi-stage ferrofluidic seal and a single-stage seal insures that no seal bursting into the high-vacuum region occurs. Bearings supporting the shaft are arranged in a mechanically-stable arrangement but are isolated from the high-vacuum environment. Thus, neither the high-vacuum environment nor the differentially-pumped region need be continually mechanically pumped, and a relatively light-weight apparatus results. The apparatus is electrically grounded by transferring the charge on the anode through the high-speed shaft out of the vacuum environment and to a slower-rotating shaft via an electrically conductive, flexible drive belt, the slower shaft rotating at a speed at which grounding by conventional means is feasible.

REFERENCES:
patent: 4357023 (1982-11-01), Yamamura
patent: 4360734 (1982-11-01), Dietz et al.
patent: 4407518 (1983-10-01), Moskowitz et al.
patent: 4577340 (1986-03-01), Carlson et al.
patent: 4772032 (1988-09-01), Raj et al.
patent: 4852140 (1989-07-01), Dax
patent: 4890850 (1990-01-01), Raj et al.
patent: 5007513 (1991-04-01), Carlson
patent: 5077781 (1991-12-01), Iversen
Rev. Sci. Instrum.: "A simple rotating anode X-ray generator"; vol. 46, No. 1, Jan. 1975.

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