Journal bearing and radiation shield for rotating housing and an

Details Journal bearing and radiation shield for rotating housing and an Journal bearing and radiation shield for rotating housing and an

1993-07-16

1995-01-24

Porta, David P.

X-ray or gamma ray systems or devices

Source

Electron tube

378130, 378133, 378140, H01J 3504

Patent

active

053848209

ABSTRACT:
A housing (A) which has a radiation transmissive window (52) defines a coolant oil reservoir (50). An x-ray tube (B) is mounted within the cooling oil reservoir. The x-ray tube includes a vacuum envelope having a cylindrical wall portion (10). A cylindrical sleeve (70) is mounted around the cylindrical wall (10) defining a narrow coolant oil gap (100). In one embodiment, a motor (16) rotates the vacuum envelope and an anode (14). The cylindrical sleeve (70) and the cylindrical rotating vacuum envelope wall portion (10) with the cooling oil film in the gap define a journal bearing which minimizes the horsepower requirements of the motor (16). A diaphragm (102) is expanded to reduce the thickness of the coolant oil film in the journal bearing gap. The cylindrical sleeve (70) is preferably constructed of a radiation blocking material such that the body of coolant oil (50) is shielded from x-rays (42). A window (76) is defined in alignment with the housing window (52) such that a beam of x-rays is permitted to leave the assembly. A radiation blocking disk (84) is mounted between the cathode and one end of the tube to block radiation exiting in that direction. The anode blocks radiation from exiting in the other direction. Optionally, an additional cylinder of radiation blocking material (86) may be mounted between the cathode and the cylindrical sleeve (70).

REFERENCES:
patent: 2233194 (1941-02-01), Atlee et al.
patent: 2900543 (1959-08-01), Heuse
patent: 4884292 (1989-11-01), Klostermann

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