Patent ID: 6158986
Filing Date: 2000-12-12
Classification: F04D

Abstract:
A turbomolecular (11) comprising ;a body (1) having a base portion and a cylindrical hollow portion (14) integral to said base portion and having an internal surface and an external surface;a rotor member (9) having an axial bell-shaped cavity (13) which partially encloses said cylindrical hollow portion (14) of said body (1);a rotating shaft (15) disposed within said axial bell-shaped cavity (13), said rotating shaft (15) being coaxial with said cylindrical hollow portion (14);at least a pair of spaced apart supporting means (5a, 5b), each having a stationary part integral to the internal surface of said hollow cylindrical portion (14) and a rotational part coupled to said rotating shaft (15); andan electric motor (7, 8) coupled to the external surface of said hollow cylindrical portion (14), corresponding to location of said supporting means (5a, 5b), said electric motor further comprising a stator (7) integral to the external surface of said cylindrical hollow portion (14) and a rotor (8) coupled to the internal surface of said axial bell-shaped cavity (13),wherein said rotating shaft, at least one of said supporting means, said stator and said rotor are sequentially resting one into the other and extending within said axial bell-shaped cavity in a radial direction.