Importance

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Abstract

A vacuum pump of the rotary vane type, comprises a casing (50) having a cylindrical inner wall surface (52), a first (54; 54') and a second (56; 56') end wall at opposite sides of said casing defining a fluid cavity therein, fluid inlet (60) and outlet (62) ports in open communication with said fluid cavity, and a rotor (64; 64') extending between said end walls carried by a drive shaft (70) for rotation about an axis eccentric to said casing inner wall surface, said rotor being provided with a plurality of longitudinally extending radial slots (66) about the periphery thereof. Further, there are provided a plurality of vanes (68), each being radially slidably carried within a respective of said slots. The invention comprises that at least one of said end walls and said rotor comprise, at oppositely facing surfaces, an annular recess (84, 86; 84', 84', 86', 86') and an annular rib (88, 90; 88', 88', 90', 90'), respectively, said rib and recess being interengaging so as to define a radial clearance (92, 96; 92', 96') and an axial seal (94, 98; 94', 98'), respectively, between said at least one of said end walls and said rotor, and that the rotor/drive shaft combination is axially biased.

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First Claim