Vertical multi-stage pump
AssigneeEbara Corporation
InventorsMasaki Watanabe, Hiroyuki Kawasaki, Shuyu Hsu
Life of this patent
Estimating the term…
Abstract
A vertical multi-stage pump includes a rotation shaft extending in a vertical direction, a plurality of impellers fixed to the rotation shaft, a multi-stage pump chamber accommodating the plurality of impellers and comprising a suction port for a first-stage impeller at a lower end, a lower casing comprising a suction nozzle extending in a horizontal direction and forming a communication space communicating the suction nozzle and the suction port, and an inner cylinder member interposed between the multi-stage pump chamber and a lower casing and expanding the communication space in a vertical direction.
Claims11
A vertical multi-stage pump, comprising:
- a rotation shaft extending in a vertical direction;
- a plurality of impellers fixed to the rotation shaft;
- a multi-stage pump chamber accommodating the plurality of impellers and comprising a suction port for a first-stage impeller at a lower end;
- a lower casing comprising a suction nozzle extending in a horizontal direction and forming a communication space communicating the suction nozzle and the suction port;
- an inner cylinder member interposed between the multi-stage pump chamber and the lower casing and expanding the communication space in a vertical direction;
- and
- an annular wall provided at a lower surface of a bottom of the inner cylinder member and protruding toward an inside of the inner cylinder member more than a peripheral wall of the inner cylinder member,
- wherein a lower surface of the multi-stage pump chamber near the suction port, a peripheral wall of the inner cylinder member, and the annular wall together form a space therein.
A vertical multi-stage pump, comprising:
- a rotation shaft extending in a vertical direction;
- a plurality of impellers fixed to the rotation shaft;
- a multi-stage pump chamber accommodating the plurality of impellers and comprising a first suction port for a first-stage impeller at a lower end;
- and
- a lower casing comprising a suction nozzle extending in a horizontal direction and forming a communication space communicating the suction nozzle and the first suction port,
- wherein the first suction port has a port diameter which is greater than an inlet diameter of the suction nozzle,
- the first suction port is formed larger than a second suction port of a second, or subsequent, stage impellers, and
- the second suction ports of the second, or subsequent, stage impellers have constant size.
Dependencies are inferred from the claim text.