초록 ▼

A positive displacement pump is provided with an impeller drive shaft seal assembly to prevent material in the pumping chamber from reaching an adjacent drive shaft chamber. The seal assembly comprises a rotary seal member mounted on the impeller having an outer surface spaced a non-uniform distance

A positive displacement pump is provided with an impeller drive shaft seal assembly to prevent material in the pumping chamber from reaching an adjacent drive shaft chamber. The seal assembly comprises a rotary seal member mounted on the impeller having an outer surface spaced a non-uniform distance from the inner surface of a member defining the drive shaft chamber so that when the drive shaft is rotated the changing distance between the inner and outer surfaces causes a pumping action to occur so that material is continually pumped around the seal assembly.

대표청구항 ▼

A positive displacement fluid pump having a stationary housing, a pump chamber in the housing having an inlet and an outlet; a drive shaft rotatably mounted in the housing; a rotary impeller located in the pump chamber and mounted on the drive shaft to pump fluid from the inlet to the outlet; an ann

A positive displacement fluid pump having a stationary housing, a pump chamber in the housing having an inlet and an outlet; a drive shaft rotatably mounted in the housing; a rotary impeller located in the pump chamber and mounted on the drive shaft to pump fluid from the inlet to the outlet; an annular drive shaft chamber opening into the pump chamber in the housing through which the drive shaft extends and having an inner surface concentric with the drive shaft axis; and sealing means for sealing the drive shaft chamber from the pump chamber comprising a rotary seal member mounted for rotation with the impeller, a stationary seal member mounted on the drive shaft chamber inner surface surrounding the drive shaft, and means biasing the seal members into contact; an outer surface on the rotary seal member which opposes the drive shaft chamber inner surface, a peripheral pocket being defined by the drive shaft chamber inner surface, the stationary seal member, and the rotary seal member, the peripheral pocket being in communication with the pump chamber; charactertized by the rotary seal member having its outer end surface spaced a non-uniform radial distance from the adjacent inner surface of the drive shaft chamber so that when the drive shaft is rotated the changing radial distance between the inner and outer surfaces causes a continuous pumping of material into and out of the peripheral pocket.