Pumps – Motor driven – Electric or magnetic motor
Patent
1997-06-02
1998-12-08
Thorpe, Timothy
Pumps
Motor driven
Electric or magnetic motor
417252, 417 42, 417 45, 418 9, F04B 1700, F01C 1100, F04C 200, F04C 1100, F04C 2300
Patent
active
058460624
ABSTRACT:
A screw type dry vacuum pump having dual shafts is disclosed, whereby the process gas is transported through three compartments, a gas admittance pump section, a central drive motor section, and a gas discharge pump section. By placing the drive motor in the center of the pump, it becomes possible to design a pump having the dual shafts supported only at one end, thus enabling to mount the rotors at the free ends of the pump which are closed with end plates which can be removed easily for servicing the pump sections. Synchronous operation of the dual shaft pump by magnetic coupling enables to lower power consumption and to extend the range of operable pressures.
REFERENCES:
patent: 1756343 (1930-04-01), Charavay
patent: 3184155 (1965-05-01), Crooks
patent: 3667874 (1972-06-01), Weatherston et al.
patent: 4505647 (1985-03-01), Alloca et al.
patent: 5314312 (1994-05-01), Ikemoto et al.
patent: 5364245 (1994-11-01), Kriehn et al.
patent: 5709537 (1998-01-01), Maruyama et al.
patent: 5736823 (1998-04-01), Nordby et al.
Hisabe Yasushi
Matake Kozo
Ojima Yoshinori
Yanagisawa Kiyoshi
Ebara Corporation
Gartenberg Ehud
Thorpe Timothy
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