Vacuum pumps
OwnerMichael Henry Northinventor
Life of this patent
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Abstract
A vacuum pump includes a pump body in which is mounted two externally threaded rotors. The thread profile of each rotor is tapered in a substantially radial direction to facilitate the machining and fitting of the rotors with the required close tolerances.
Claims6
A vacuum pump incorporating a screw mechanism and comprising two externally threaded rotors mounted in a pump body and adapted for counter-rotation in the body with intermeshing of the rotor threads and with close tolerances between the threads and internal pump body surfaces in order to pump gas from a pump inlet to a pump outlet by action of the rotors and wherein the thread profile of each rotor is tapered in a substantially radial direction.
Dependencies are inferred from the claim text.