Device for admixing a processing agent to a pulp suspension

Agitating – Having specified feed means – Agitation of material in feeder or supply reservoir

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Details

3661681, B01F 1502

Patent

active

055055400

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to a device for admixing a processing agent to a pulp suspension in a bin. According to this invention the processing agent can consist of liquids and chemicals, substantially in a fluid state, for dilution or other treatment of the pulp suspension.


BACKGROUND OF THE INVENTION

During all of the various types of pulp processing, a persistently continuous and proportional admixture of processing agents to the pulp is of decisive importance in order to obtain an acceptable result.
In previously known devices the processing agent is admixed to the pulp in the lower portion of a pulp bin. The mixing device generally comprises a propeller, which accelerates the pulp to a high rate through a nozzle, whereby the surrounding pulp is continuously sucked in. The processing agent is thereby added to the pulp before it is sucked into the mixing device. In these cases, however, a high pulp concentration in the bin, for example 12%, creates a problem for achieving continuous admixing. In order to reduce this problem, bins have been designed in order to have a bottom zone of reduced size. This, however, results in a decrease in processing volume, as well as a more complicated and more expensive bin design. Such an arrangement also requires more energy, since it is an incomplete admixing technique.
According to the present invention, the above problem is eliminated in view of the fact that the processing agent is added and distributed centrally, and the pulp flow is improved. The mixing result is improved, while at the same time the energy consumption is minimized.


SUMMARY OF THE INVENTION

In accordance with the present invention, these and other objects have now been realized by the discovery of apparatus for mixing a processing medium with a pulp suspension within a bin in which the apparatus includes a housing for attachment to a wall of the bin, a rotary shaft extending through the housing into the interior of the bin, a propeller attached to the rotary shaft, the propeller including a hub for attachment to the rotary shaft, and nozzle means surrounding the propeller and including an inlet for directing the pulp suspension from the inlet to the propeller, the housing including a dilution chamber for the processing medium and an outlet aperture for the dilution chamber for directing the processing medium towards the hub, the outlet aperture and the hub being separated by a predetermined gap whereby the processing medium is contacted with the pulp suspension before the pulp suspension contacts the propeller.
In a preferred embodiment the housing is a conical configuration.
In accordance with another embodiment of the apparatus of the present invention, the outlet aperture from the dilution chamber extends about the entire circumference of the rotary shaft. In another embodiment, the apparatus includes sealing means for sealing the shaft through the wall of the bin. Preferably in this embodiment the sealing means is directly connected to the dilution chamber whereby the sealing means is not in direct contact with the pulp suspension.
In accordance with another embodiment of the apparatus of the present invention, the nozzle includes a plurality of guide bars mounting the nozzle around the propeller with respect to the wall of the bin. In another embodiment the predetermined gap is adjustably alterable by axial movement of the rotary shaft. In yet another embodiment, the apparatus includes aperture means extending through the hub for permitting at least a portion of the processing medium to pass through the aperture means for subsequent contact with the pulp suspension downstream of the hub.


BRIEF DESCRIPTION OF THE DRAWINGS

The following detailed description can be more readily appreciated with reference to the Figures, in which:
FIG. 1 is a side, elevational, partially cross-sectional view of a mixing device in accordance with the present invention;
FIG. 2 is a front, elevational, cross-sectional view of the mixing device shown in FIG. 1 taken along lines II--II the

REFERENCES:
patent: 2833630 (1958-05-01), Loevenstein
patent: 2887305 (1959-05-01), Ginneken
patent: 3202281 (1965-08-01), Weston
patent: 3912231 (1975-10-01), Weber

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