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Paper pulp centrifugal pump with gas separation
| Details |
Inventors: Dosch, Joseph B.; Cappellino, Charles A.; Wilson, George; Osborne, James C.;
Assignee: Goulds Pumps, Incorporated (Seneca Falls, NY)
Primary Examiner: Look; Edward K.
Assistant Examiner: Lee; Michael S.
Attorney, Agent or Firm: Bean, Kauffman & Spencer
The invention relates to a centrifugal pump particularly adapted for pumping fibrous suspensions from within a reservoir, wherein the pump includes a rotor arranged wholly within the reservoir for cooperation with the bottom wall thereof to effect fluidization of suspension and discharge of the fluidized suspension from the reservoir for passage through the pump, wherein an entrained gas, such as air, is withdrawn from the pump by means of a unique pump-out mechanism disposed rearwardly of a shroud of an impeller of the pump and including pump-out vanes and a repeller shroud cooperating with the impeller shroud and pump-out vanes to define radially opening flow paths, wherein flow openings extend across the impeller shroud for flow communication with the radially opening flow paths. The mechanism may also include repeller vanes carried by the repeller shroud to extend rearwardly of pump-out vanes. |
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DETAILED DESCRIPTION The present invention is directed towards an improvement in the centrifugal pump construction disclosed in copending U.
S.
patent application Ser.
No.
07/384,787 now U.
S.
Pat.
No.
4,936,744, filed July 25, 1989, and more particularly to a pump construction adapted for use in pumping fibrous suspensions from a reservoir of varying heights without requiring precise control of the pressure drop across the pump and at relatively low pump rotational speeds without resorting to providing suspension flow impeding fluidizing vanes or ribs lining the suspension flow path extending from the reservoir to the interior of the pump.
A pump formed in accordance with the present invention is of conventional construction from the standpoint that it includes a housing defining a pumping chamber having an axially opening suction inlet communicating with a discharge opening defined by discharge means of a reservoir for fibrous suspension and a radially opening discharge outlet; an impeller mounting for rotation within the pumping chamber by a drive shaft, which is aligned with the suction inlet and arranged to extend rearwardly of the impeller through an opening formed in a rear wall of the pumping chamber; and a gas removal system for removing gas tending to collect within the pumping chamber rearwardly of the impeller.
More specifically, the impeller includes a shroud extending radially of the drive shaft and having flow openings extending between front and rear surfaces thereof; pumping vanes carried by the front surface of the shroud for pumping liquid between the suction inlet and discharge outlet; and pump-out vanes carried by the rear surface of the shroud for pumping liquid passing rearwardly of the impeller through the flow openings for discharge through the discharge outlet.
The gas removal system includes a vent recess opening through the rear wall of the pumping chamber annularly of the drive shaft, a vacuum pump, a gas vent conduit connecting the vent recess to the vacuum pump, and a gas flow control valve arranged in the gas discharge conduit for varying the pressure within the vent chamber
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Generators or Motors 
