Gas friction pump having a bell-shaped rotor

Details Gas friction pump having a bell-shaped rotor Gas friction pump having a bell-shaped rotor

1990-07-19

1992-11-24

Smith, Leonard E.

Pumps

Motor driven

Electric or magnetic motor

415 90, 41742315, 41742312, F04D 1904, F04D 2964

Patent

active

051658720

ABSTRACT:
A friction pump includes a generally cylindrical first housing part, a generally cylindrical second housing part projecting axially into the inner space of the first housing part; a bearing mounted in the second housing part coaxially therewith; and a pump rotor supported for rotation in the bearing. The pump rotor has a cylindrical shell surrounding the second housing part. The pump further has a drive motor mounted in the second housing part for driving the pump rotor; and a helical channel defined between the inner face of the first housing part and the outer face of the pump rotor for pumping gases upon rotation of the pump rotor. The second housing part, the bearing, the pump rotor and the drive motor form a single structural unit that can be axially removed from the first housing part after releasing a coupler between the two housing parts.

REFERENCES:
patent: 4456433 (1984-06-01), Henning et al.
patent: 4684317 (1987-08-01), Luijten et al.
patent: 4746265 (1988-05-01), Luijten
patent: 4893985 (1990-01-01), Holss

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