Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between shaft or shaft sleeve and...
Patent
1995-06-07
1997-03-25
Look, Edward K.
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between shaft or shaft sleeve and...
417365, F04D 2904
Patent
active
056138318
ABSTRACT:
A pressure compensation system for a rotary pump prevents axial displacement of the pump shaft. The pump includes a shaft rotatable about a major axis extending centrally of the shaft, at least one impeller attached to the shaft, and a pump housing for enclosing the shaft and at least one pump impeller for generating fluid pressure for pumping upon rotation of the shaft and the at least one impeller. In these pumps, the fluid pressure can exert an axial thrust along the major axis of the shaft. Therefore, such pumps include means for thrust compensation during rotation of the shaft. The improvement in the means for thrust compensation includes a first set of permanent magnets arrayed around and attached to the shaft and a second set of permanent magnets arrayed on the pump housing. The second set of permanent magnets magnetically attracts the first set of permanent magnets to hold the shaft and the at least one impeller at a fixed position along the major axis of the shaft with respect to the pump housing. Upon rotation of the shaft generating the axial thrust along the major axis of the shaft, the first set of permanent magnets and the second set of permanent magnets oppose movement of the shaft along the major axis of the shaft with respect to the housing.
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Lee Michael S.
Look Edward K.
Sulzer Pumpen AG
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