Pumps – Processes
Patent
1998-09-30
2000-09-19
Freay, Charles G.
Pumps
Processes
417202, 417 69, 415143, 4151691, F04B 2314, F04C 1900
Patent
active
061202525
ABSTRACT:
A centrifugal and vacuum pump combination in which the impeller of a centrifugal pump is disposed on the same shaft as a rotor of the vacuum pump, with a gas outlet extending between the centrifugal and vacuum pumps, is operated by positively controlling the flow of gas passing through the gas outlet duct, for example by changing the effective cross-sectional flow area of the outlet duct. The fluent material handled by the pump is preferably a cellulose fiber slurry having a solids consistency of between about 6-15%. The control can be effected automatically in response to solids consistency, inlet pressure, and/or gas content of the slurry being pump. The vacuum pump housing includes an eccentric inner wall, and operation of the pump may be primarily controlled by moving the vacuum pump housing.
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Reponen Voitto
Vesala Reijo
Vikman Vesa
Ahlstrom Machinery Corporation
Freay Charles G.
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