Vacuum pump with helically threaded cylinders

Details Vacuum pump with helically threaded cylinders Vacuum pump with helically threaded cylinders

1991-01-25

1992-10-13

Kwon, John T.

Rotary kinetic fluid motors or pumps

Smooth runner surface for working fluid frictional contact

F01D 136

Patent

active

051545721

ABSTRACT:
A vacuum pump includes a rotatable cylinder rotatably disposed coaxially around an inner stationary cylinder and in an outer stationary cylinder. The rotatable cylinder has a plurality of recesses defined in inner and outer circumferential surfaces thereof. The outer stationary cylinder has a helical groove defined in an inner circumferential surface thereof. The inner stationary cylinder has a helical groove defined in an outer circumferential thereof. The rotatable cylinder is rotated by a motor to deliver a gas axially along the helical grooves. The recesses are effective to produce turbulent flows in the gas to increase the rate at which the gas is discharged. The recesses have an axial length smaller than the transverse width of helical threads on the outer circumferential surface of the inner stationary cylinder and the inner circumferential surface of the outer stationary cylinder, to minimize any gas leakage across the helical threads.

REFERENCES:
patent: 1810083 (1931-01-01), Norinder
patent: 2730297 (1956-01-01), Van Dorsten et al.
patent: 4732529 (1988-03-01), Narita et al.
patent: 4732530 (1988-03-01), Ueda et al.
patent: 4735550 (1988-04-01), Okawada et al.
patent: 4797062 (1989-01-01), Deters et al.
patent: 4806074 (1989-02-01), Burger et al.
patent: 4822251 (1989-04-01), Amrath et al.
patent: 4826393 (1989-05-01), Miki
patent: 4893985 (1990-01-01), Holss
patent: 4929151 (1990-05-01), Long et al.

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