Thread groove type vacuum pump

Details Thread groove type vacuum pump Thread groove type vacuum pump

1986-08-14

1987-11-24

Garrett, Robert E.

Rotary kinetic fluid motors or pumps

Runner has spirally arranged blade or fluid passage

Extending along runner axis

F04D 302

Patent

active

047085860

ABSTRACT:
A hollow cylindrical stator and a cylindrical rotor are disposed in the stator with a gap therebetween, the inner peripheral surface of the stator or the outer peripheral surface of the rotor being provided with a helical groove, or thread groove, and evacuation being performed by rotation of the rotor. The width of the helical groove adjacent the suction side of the pump is larger than the width of a ridge between adjacent turns of the groove.

REFERENCES:
patent: 2505386 (1950-04-01), Collins
patent: 3135216 (1964-06-01), Peterson
patent: 3801214 (1974-04-01), Jonsson
patent: 3870433 (1975-03-01), Raikov et al.
patent: 3912415 (1975-10-01), Maurice
"Rarefied Gas Flow in a Rectangular Groove Facing a Moving Wall", by Tadashi Sawada, Scientific Papers of the Institute of Physical and Chemical Research, Dec. 1976, vol. 70, No. 4.

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