Patent ID: 6253029
Filing Date: 2001-06-26
Classification: F04B,F04C,F04D,F05D,Y02T

Abstract:
A vacuum pump comprising:a casing having an inlet through which a gas including an unwanted by-product is introduced into said casing;a rotor which is rotatably situated in said casing; andmeans for rotating said rotor;wherein said casing includes:a casing body providing an outer surface of said vacuum pump;an inner layer disposed on an inner surface of said casing body and having a thickness smaller than that of said casing body, said inner layer having a rotor-side surface facing said rotor; andheating means interposed between said casing body and said inner layer for heating said rotor and said rotor-side surface of said inner layer to a temperature higher than a temperature at which the unwanted by-product in the gas is separated.