Sealing and pumping means and methods

Details Sealing and pumping means and methods Sealing and pumping means and methods

F - Mech Eng,Light,Heat,Weapons

16

J

F16J 15/36 (2006.01) F04D 29/06 (2006.01) F04D 29/12 (2006.01) F04D 29/22 (2006.01) F16C 33/66 (2006.01) F16J 15/38 (2006.01) F16N 7/18 (2006.01) F16N 7/36 (2006.01) H02K 9/14 (2006.01) H02K 49/10 (2006.01)

Patent

CA 2125184

A sealing arrangement is provided for preventing fluid leakage along the drive shaft (23) of a centrifugal pump (40) driven by an electric motor (21). The sealing arrangement is in the form of three separate sealing assemblies: a w-shaped seal formed by a casing backplate (42) and repeller (70, 71); a triplex sealing assembly (31) which seals a rotating shaft flange seal surface (68) by use of non-rotatable but axially movable sealing tubes (96, 97, 98) which are biased by three flexible diaphragms (11, 170, 171); and a piston seal arrangement (32) where an adjustable force piston (180) biased an axially movable but non-rotatable sealing tube (198) against a sealing surface of a rotating flange (201). An oil mister (34) is also provided which lubricates bearing assemblies (35, 36) of the shaft. A cooling fan (33) is magnetically coupled to the electric motor by magnet (328, 420) for cooling the motor.

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