Patent ID: 7001159
Filing Date: 2006-02-21
Classification: F04D,F05D

Abstract:
1. A motor-driven pump, comprising: a motor mounted within a motor housing and adapted for rotatably driving a drive shaft; a seal plate at one end of said motor housing, said seal plate having an outboard side and an inboard side relative to said motor housing, and said seal plate further defining a vent chamber formed between said outboard and inboard sides; a shaft bearing within said motor housing and rotatably supporting said drive shaft extending through a ore formed in said seal plate; a housing member defining a pump chamber having a suction intake port and a pressure discharge port; an impeller carried by said drive shaft within said pump chamber for rotatable driving therein to pump fluid from said suction intake port to said pressure discharge port; a primary seal assembly at said outboard side of said seal plate for preventing fluid leakage from said pump chamber along said drive shaft and into contact with said shaft bearing within said motor housing; and a secondary seal assembly disposed generally at said inboard side of said seal plate, and secondary seal assembly including an axially spaced pair of slinger disks carried by said drive shaft for rotation therewith within said vent chamber, and an expansion washer carried by said seal disk axially between said pair of slinger disks and in running clearance with said drive shaft, said pair of slinger disks and said expansion washer cooperatively defining a tortuous path for fluid leakage along said drive shaft, and said slinger disks slinging fluid leaking axially along said drive shaft in a radially outward direction.