Agitating – Having specified feed means – Agitation of material in feeder or supply reservoir
Patent
1997-07-09
2000-02-15
Soohoo, Tony G.
Agitating
Having specified feed means
Agitation of material in feeder or supply reservoir
366290, 366245, B01F 716
Patent
active
06024481&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a mixer for mixing of liquids or suspensions and a method for mixing.
BACKGROUND OF THE INVENTION
On the market there are since long different mixers consisting of an agitator which is driven by a motor in a cylindrical vessel. The means which achieve the stirring may be one or several plane shovels or plates, a propeller or a turbine wheel. Such mixers have been used in many connections and for many different purposes.
SUMMARY OF THE INVENTION
According to the invention there is now proposed an effective and space saving embodiment of a mixer. The mixer according to the invention is mainly characterized in that it comprises two mixing chambers provided each with an exterior inlet, a first chamber having a little volume in relation to a second chamber. The chambers are connected to each other in such a way that the outlet of the first chamber is an inlet to the second chamber. A number of mixing elements are arranged on a rotating axis which is common for the two chambers. The mixing elements have different shape in the two chambers and the mixing elements in the first chamber are arranged to achieve mixing by means of large shear forces, while the mixing elements in the second chamber are arranged to achieve mixing through stirring mainly without shear forces.
With a mixer of such design there is obtained two different kinds of mixing with only one driving means.
The high shear forces which are needed for the mixing in the first chamber demand a high addition of energy.
With advantage the first chamber is arranged above the second chamber, since the bearing of the rotating axis in the larger lower chamber gives a smaller influence on the flow conditions in the same. If so is desired the first smaller chamber may, however, be arranged below the second chamber. Providing the mixer with a vertical stirring axis means that the demand of space is little.
In order to achieve the desired high shear forces in the first chamber the mixing elements in the same suitably consists of turbine wheels with shovels. Depending on the capacity of the mixer may 4, 6 or more shovels be used. Also other kinds of mixing elements which give rise to high shear forces may of course be used.
The mixing elements in the second chamber consist with advantage of impeller formed agitators which give a little increase in pressure.
With advantage as well the upper as the lower chamber are provided with flow disturbing baffle plates at the walls of the mixing chamber. These plates are preferably arranged radially in the respective chamber with an extension of .about.1/10 of the diameter of the mixing chamber.
Both the upper and the lower mixing chamber are suitably also provided with annular horizontal plates arranged between the mixing elements. These plates divide the mixing chambers in a number of partial spaces where separate vortex formations occur.
The mixer according to the invention is with advantage provided with a motor with variable rotation speed which drives the rotating axis. By way of such an arrangement the mixer may easily be adapted to different kinds of mixing tasks.
The invention also comprises a method for continuous mixing of a small amount of a first liquid with a considerably larger amount of a second liquid in a mixer of the kind which has been described above. The first liquid is mixed with the second liquid in a first mixing chamber in which the mixing takes place by means of high shear forces, after which the obtained mixture in a second mixture chamber is subjected to mixing by stirring mainly without shear forces.
The method according to the invention is suitable for degumming, refining or other treatment of vegetable oils. In such a treatment the first liquid is a chemical additive as for example an accid, a caustic solution or anti-oxidant while the second liquid consists of vegetable oil.
The method is suitably carried through in such a way that a chemical additive is mixed with a partial flow of vegetable oil in the first mixing chamber while t
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Hillstrom Anders
Sjoberg Peter
Alfa Laval AB
Soohoo Tony G.
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