US 5,209,641 AGranted

Apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material

AssigneeKamyr, Inc.

InventorsRonny Hoglund, Ulf Jansson

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Abstract

An apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material is described which comprises a housing, a fluidizing rotor and an impeller of radial type, said housing having a cylindrical portion for the rotor, a portion for the impeller which is radially enlarged in relation to the cylindrical portion, a wall closing one end of the housing and a shaft rigidly connected to the impeller, an axial inlet for suspension being disposed at the cylindrical portion, and a radial outlet for suspension at the radially enlarged portion. The apparatus has also a degassing system for removing gas which collects in front of the impeller and comprising an opening in the impeller and the wall, the impeller having a hub, a partition and forward and rear blades. Furthermore, the impeller is provided with a concentric, circular inlet for the continuous supply of suspension to the rear blade space, the rear blades being arranged to exert a pump action on the suspension supplied to the apparatus.

Claims9

Dependent claims

An impeller for use in an apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material, comprising:

a hub;
a wall means surrounding said hub;
and a means for exerting a pumping action on the suspension to increase the head acting thereon, said means comprising:
a plurality of forward blade means, said forward blade means disposed to extend from one side of said wall means and a plurality of rear blade means disposed to extend from said wall means on the opposite side thereof from said forward blade means,
and means defining an annular opening in said wall means to allow for continuously supplying suspension to said rear blade means to be pumped thereby, said rear blade means having an axial extension at a radial portion located radially outside said means defining said annular opening which is greater than the axial extension of the forward blade means located radially outside said means defining said annular opening, said means defining said annular opening comprising said wall means having an inner, concentric flange and an outer concentric ring which is located at a distance from the inner flange to define therebetween said annular opening.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/707,053Filed 29 May 1991 · continuation
Priority: SE 890108229 Mar 1989
Granted: 11 May 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

D21D 5/26
Purification of the pulp suspension by mechanical means; Apparatus therefor: de-aeration of paper stock
F04D 7/045
The fluids being viscous or non-homogenous: with means for comminuting, mixing stirring or otherwise treating
F04D 29/2288
With special measures: for comminuting, mixing or separating
F05B 2210/132
Mixed, e.g. two-phase fluid: pumps with means for separating and evacuating the gaseous phase