Pump with separate fluidizing vaned shaft adjacent impeller
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United States of America Patent
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Dec 11, 1990
Grant Date -
N/A
app pub date -
Jul 18, 1989
filing date -
Jul 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pumping system is capable of handling a paper pulp suspension of medium consistency (e.g. about 8-15% solids consistency) utilizing a conventional centrifugal pump. A conventional pump system capable of handling 3-8% consistency pulp may be retrofit to handle 8-15% consistency pulp. A tube with vanes, and having an open end, extends through the inlet to the pump so that there is a small clearance between the vanes and the inlet, and so that the open end is adjacent but spaced from the hub of the pump impeller. A gas passage extends from the hollow interior of the tube to an area remote from the pump. The tube is rotated in a direction of rotation opposite to the direction of rotation of the pump impeller, and at a speed sufficient to fluidize pulp of about 8-15% consistency, and to force the pulp toward the pump. Gas which collects at the pump impeller is withdrawn through the tube and a gas passage in a shaft connected to the tube, and for that purpose a vacuum pump may be utilized.
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