Pumps – Motor driven – Electric or magnetic motor
Patent
1989-07-14
1990-09-18
Smith, Leonard E.
Pumps
Motor driven
Electric or magnetic motor
4182011, F04B 3504, F01C 124
Patent
active
049574175
ABSTRACT:
A vertical oilless screw vacuum pump for effective use in industrial processes to which air containing oil is detrimental, such as vacuum food packaging processes and semiconductor device manufacturing processes. The vertical oilless screw vacuum pump includes a pump unit having a pump casing provided with a suction port in the upper portion and a discharge port in the lower portion thereof, and a set of meshed male and female oilless screw rotors disposed within the pump casing A, also high-frequency motor is disposed under the pump unit and has a motor casing joined to the lower end of the pump casing. The output shaft of the motor is coupled directly with one of the rotor shafts of the oilless screw rotors to drive the oilless screw rotors directly without using any gear train. Bearings supporting the upper ends of the rotor shafts are lubricated by a grease having a vapor pressure below a desired ultimate vacuum to be achieved by the vertical oilless screw vacuum pump. The motor casing is used also as an oil reservoir for containing a lubricating oil for lubricating bearings supporting the lower ends of the rotor shafts. The use of the grease for lubricating the bearings disposed near the suction ports avoids the dispersion of oil into a vacuum. The direct coupling of the rotor shaft and the output shaft of the motor, and the use of the motor casing as an oil reservoir enables the vertical oilless screw vacuum pump to be constructed in a compact construction.
Kabushiki Kaisha Kobe Seiko Sho
Savio, III John A.
Smith Leonard E.
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