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US 11,378,097 B2Granted
Multistage centrifugal pump
AssigneeGrundfos Holding A/S
InventorsErik Bundesen Svarre, John Frigård Nielsen, Finn Ulrich Storgaard, Iraj Babazadeh
Life of this patent
Estimating the term…
Abstract
A multi-stage centrifugal pump includes a pump casing, in which a shaft (8) carrying an impeller is rotatably arranged. The pump casing has a pump casing foot part (2) that includes a reversibly closable maintenance opening (60), via which a bearing and/or seal (20, 25), which is arranged at a shaft end within the pump casing, is accessible and exchangeable.
Claims20
A multistage centrifugal pump comprising:
- a pump housing;
- pump stage impellers, each of the stage impellers having a stage impeller outer diameter;
- a shaft which carries the impellers and is rotatably arranged with one end within the pump housing and another end located at a position outside of the pump housing, wherein the one end is pressurized to compensate for axial forces acting on the shaft;
- and
- a shaft end cooperating part comprising a bearing or a seal or a bearing and a seal arranged within the pump housing on the one end of the shaft, wherein the pump housing comprises a reversibly closable maintenance opening, via which the shaft end cooperating part is accessible and is exchangeable, wherein the seal is an axial seal comprising a stationary part and a ring, which is arranged in an axially movable manner within the pump housing or within a component which is integrated therein, wherein the axial seal is accessible and removable via the reversibly closable maintenance opening, the reversibly closable maintenance opening comprising an opening outer diameter, the opening outer diameter being less than the stage impeller outer diameter, the stationary part comprising a holding ring, at least a portion of the holding ring being arranged in the maintenance opening, the holding ring comprising one more channels fluidly connecting a pressure side of the pump to an interior of the holding ring.
2 more elements
A multistage centrifugal pump comprising:
- a pump housing;
- pump stage impellers, each of the pump stage impellers having an impeller outer diameter;
- a shaft which carries the impellers and is rotatably arranged with one end within the pump housing and another end located outside of the pump housing;
- and
- a shaft end cooperating part comprising a bearing or a seal or a bearing and a seal arranged within the pump housing on the one end of the shaft, wherein the pump housing comprises a reversibly closable maintenance opening, via which the shaft end cooperating part is accessible and is exchangeable, the reversible closable maintenance opening comprising an opening outer diameter, the opening outer diameter being less than the impeller outer diameter, the seal comprising an axial seal, the axial seal comprising a stationary part and a non-rotating seal part, the non-rotating seal part being movable in an axial direction relative to the stationary part via pressure generated from fluid delivered to the pump housing, wherein the one end of the shaft is pressurized to compensate for axial forces acting on the shaft via the fluid delivered to the centrifugal pump, the stationary part comprising a holding ring, at least a portion of the holding ring being arranged in the maintenance opening, the holding ring comprising one more channels fluidly connecting a pressure side of the centrifugal pump to an interior of the holding ring.
2 more elements
A multistage centrifugal pump comprising:
- a pump housing;
- pump stage impellers, each of the pump stage impellers comprising an outer impeller diameter;
- a shaft which carries the impellers and is rotatably arranged with a first end arranged within the pump housing and a second end arranged at a location outside of the pump housing;
- and
- a shaft end cooperating part comprising a bearing or a seal or a bearing and a seal arranged within the pump housing on the first end, wherein the pump housing comprises a reversibly closable maintenance opening, via which the shaft end cooperating part is accessible and is exchangeable, the seal comprising an axial seal, the axial seal comprising a rotating ring, a holding ring and a movable ring, the movable ring being movable relative to the holding ring in a direction of the rotating ring based on pressure generated from fluid delivered to the pump housing, the reversibly closable maintenance opening comprising an opening outer diameter, the opening outer diameter being less than the outer impeller diameter, wherein the first end is pressurized to compensate for axial forces acting on the shaft via the fluid delivered to the centrifugal pump, at least a portion of the holding ring being arranged in the maintenance opening, the holding ring comprising one more channels fluidly connecting a pressure side of the pump to an interior of the holding ring.
2 more elements
Dependencies are inferred from the claim text.