Patent ID: 6450772
Filing Date: 2002-09-17
Classification: F04D,F05D

Abstract:
A molecular drag vacuum pump configured for pumping a gas stream from an inlet to an outlet, the pump comprising:a) a spinning disk having a channel formed in a disk edge; b) a wiper adjacent to all surfaces of the channel, whereby the gas stream introduced into the inlet is compressed through contact with a surface of the spinning disk while traveling at least through a portion of the channel toward the outlet; c) at least one circumferential passageway disposed adjacent the spinning disk and in fluid communication with the inlet and outlet, for directing the gas stream into at least a portion of the channel, and further comprising a first passageway in fluid communication at a first end with the inlet, a second passageway in fluid communication at a first end with a second end of the first passageway, and a third passageway in fluid communication at a first end with a second end of the second passageway, and at a second end with the outlet; d) a housing enclosing the spinning disk, the housing comprising an inlet cover having an inside and an outside, a stator having an inside surface, and an outlet cover having an inside and an outside; e) an inlet comprising a conduit formed in the inlet cover and extending from the outside to a first end of the first passageway; f) wherein the outlet comprises a conduit formed in the outlet cover and extending from the second end of the third passageway to the outside of the outlet cover; g) wherein the first passageway comprises at least one circular channel formed on the inside of the inlet cover so as to be disposed adjacent to the top surface of the spinning disk; h) the second passageway comprises a circular channel defined by the channel formed in the edge of the spinning disk and the inside surface of the stator; and i) the third passageway comprises a circular channel formed on the inside of the outlet cover so as to be disposed adjacent to the bottom surface of the spinning disk.