X-ray or gamma ray systems or devices – Source – Electron tube
Patent
1984-02-10
1986-11-25
Church, Craig E.
X-ray or gamma ray systems or devices
Source
Electron tube
378141, 378144, 313 22, 313 24, 313 30, H01J 3510
Patent
active
046253246
ABSTRACT:
An all metal and ceramic high vacuum rotary anode x-ray tube adapted for mounting on a gantry of a rotational type CT scanner. The evacuated region where x-rays are generated is maintained at about 10.sup.-7 Torr. Vacuum sealing about the rotating shaft of the anode is provided by a magnetic fluid. No bearings are utilized within the evacuated region. Large, long wearing ball bearings that transmit rotation through the vacuum seal are provided about the shaft outside of the high vacuum region where conventional lubricants may be applied. Circulating coolant is applied internally through the anode assuring continual operation of the tube without the need for frequent cool-down waits. A preferred embodiment discloses a modified path in the rotor for the coolant designed to disturb the conventional laminar type of flow which is heat transfer inefficient to one characterized by high turbulence resulting in approximately an order of magnitude improvement in the coefficient of heat transfer.
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"Magnetic-Fluid Seals" by Raj, et al., Laser Focus Magazine, Apr. 1979, pp. 56-63.
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"Ferrofluidic Sealing Capabilities", published by Ferrofluidics Corporation, 40 Simon Street, Nashua, NH 03061.
Blaskis Edward A.
Carlson Roland W.
Church Craig E.
Ciamporcero, Jr. Audley A.
Kaufman Michael A.
Technicare Corporation
Wieland Charles F.
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