Vacuum pump
AssigneeEdwards Limited
InventorsNeil Turner, Malcolm William Gray, Jack Raymond Tattersall
Life of this patent
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Abstract
A pair of Northey rotors for a vacuum pump, in which each rotor comprises two opposing, substantially parallel faces, and a peripheral surface located between the opposing faces. In order to reduce damage caused by pumping a gas stream containing liquid or solid particulates, a plurality of grooves is located on the peripheral surface for accommodating the particulates.
Claims8
A Northey rotor for a vacuum pump, comprising two opposing, substantially parallel faces, a peripheral surface located between the opposing faces, and a plurality of grooves located on the peripheral surface.
A pair of Northey rotors for a vacuum pump, each rotor comprising two opposing, substantially parallel faces, a peripheral surface located between the opposing faces, and a plurality of grooves located on the peripheral surface for accommodating solid or liquid material entrained within a gas stream pumped by the rotors.
A pair of Northey rotors for a vacuum pump, each rotor comprising two opposing, substantially parallel faces, a peripheral surface located between the opposing faces, and a pattern of grooves located on the peripheral surface, and wherein the disposition of the pattern on one of the rotors is different from that on the other rotor.
A vacuum pump comprising a chamber housing two Northey rotors located on respective shafts and adapted for counter-rotation within the chamber, each rotor comprising two opposing, substantially parallel faces, a peripheral surface located between the opposing faces, and a plurality of grooves located on the peripheral surface for accommodating solid or liquid material entrained within a gas stream passing through the pump.
A vacuum pump comprising a chamber housing two Northey rotors located on respective shafts and adapted for counter-rotation within the chamber, each rotor comprising two opposing, substantially parallel faces, a peripheral surface located between the opposing faces, and a pattern of grooves located on the peripheral surface, and wherein the disposition of the pattern on one of the rotors is different from that on the other rotor.
Dependencies are inferred from the claim text.