Scroll vacuum pump

Details Scroll vacuum pump Scroll vacuum pump

2005-10-11

2005-10-11

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

C418S094000, C418S101000, C418S055100, C418S055600, C184S006180

Reexamination Certificate

active

06953330

ABSTRACT:
A scroll vacuum pump has an orbiting scroll and fixed scrolls. The orbiting scroll is rotatably mounted to an eccentric portion of a driving shaft and revolved by the driving shaft, so that a gas is sucked into a compression chamber between the orbiting scroll and fixed scrolls through a sucking bore. External air is introduced through a ventilating hole axially formed in the driving shaft and into the compression chamber via a check valve that opens by centrifugal force when the driving shaft rotates, thereby cooling the eccentric portion and bearings to increase durability thereof. When the driving shaft stops, the check valve closes, so that a toxic gas in the compression chamber is not leaked to the outside to prevent environment pollution.

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patent: 03237287 (1991-10-01), None
patent: 2001-304148 (2001-10-01), None

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