Friction pump

Details Friction pump Friction pump

1984-05-15

1987-02-24

Look, Edward K.

Rotary kinetic fluid motors or pumps

Runner has spirally arranged blade or fluid passage

Extending along runner axis

415 90, 415212A, F01D 136

Patent

active

046454136

ABSTRACT:
A friction pump (molecular pump, turbomolecular pump) has pumping surfaces which include surface areas which face upstream as well as surface areas which face downstream with respect to the pumping direction. In at least a portion of the pumping surfaces, surface areas of different roughness are present, such that the roughness of the surface areas facing downstream with respect to the pumping direction is greater than the roughness of the surface areas facing upstream with respect to the pumping direction.

REFERENCES:
patent: 158599 (1875-01-01), Fairfax
patent: 1331997 (1920-02-01), Neal
patent: 3168977 (1965-02-01), Garnier et al.
patent: 3947193 (1976-03-01), Maurice
patent: 4309143 (1982-01-01), Klatt et al.
"Theorie und Praxis der Vaccumtechnik," Wutz, Adam and Walcher, pp. 202-221.

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