US1786009A

US1786009A - Apparatus for mixing liquids

Info

Publication number: US1786009A
Application number: US366715A
Authority: US
Inventors: Duwe Friedrich
Original assignee: MAN Maschinenfabrik Augsburg Nuernberg AG
Current assignee: MAN AG
Priority date: 1928-06-13
Filing date: 1929-05-28
Publication date: 1930-12-23
Anticipated expiration: 1947-12-23

Description

Dec. 23, 1930. uw

APPARATUS FOR MIXING LIQUIDS Filed May 28, 1-929 Patented Dec. 23, '1930 UNITED STATES PATENT OFFICE,

. rmnnmcn DUWE, or nmmz-xnsrnn, GERMANY, Ass GNoR 'ro mscnmmnnm noesnunohwnnnnae A. G., or NUREMBERG, IBAVARIA, GER-MANY, noonrom- 'IION 0F GERMANY APPARATUS FOR MIXING LIQUIDS Application filed May as, 1929, Serial No.

My invention relates to apparatus for mixing liquids and more especlally to apparatus of this kind in which the mixing of a liquid is accomplished by means of a screw-propeller;

In order to intimately mix liquids of different kinds and properties,-mixing devices have been used which consist of a container for said liquids and a screw propeller drawing-in the liquid near thebottom of the con tainer and discharging said drawn-in liquid onto the level of the liquid in the container by means of a discharge member which is of funnel-shaped conformation and of a diameter enlarging upwardly.

An apparatus of this kind, however, is not suitable, if large amounts of liquid have"to be mixed. In this case the, propeller casing which is open in the upward direction will become of such greatly enlarged cross-sectionthat the discharge velocity of the liquid will be essentiallydecreased. Also, in large apparatus of this kind it'is difficult to bring about a proper lateral deflection and uniform distribution of the liquid when discharging as well as of the jet of discharging liquid when coming in contact with the level of the liquid in the container. In addition to this the throw of the discharging liquid will be of rather small extent.

The general object of this invention consists in providing a construction for liquid mixing apparatus operated by screw propellers in which apparatus the aforementioned 1 drawbacks are successfully avoided. Essen- "tially, this invention consists in this that the discharge end of the casing of the screw propeller is composed of a plurality of properly curved nozzles arranged adjacent to each other and distributed around the axis of said propeller. According to this invention, furthermore, the radius of curvature. of the upper portion of the wall of said nozzles is smaller than the radius of curvature at the under portion of said nozzles and the end of the said upper portion of the nozzlesis made to project beyond said under portio in order to attain-a uniformly distributed j t of discharging liquid in'the form of an umbrellashaped veil of liquid.

366,715, and in Germany, June 13, was.

In amixing apparatus constructed according to my invention, the extent of the throw of the liquid discharging from the propeller casing may be regulated by a regulation of the speed of the" ropeller, for instance, by a regulation of the driving motor. More particularly, in order to attain a proper extent of the throw of liquid discharging from the nozzles, in case of containers having a large diameter, it is of advantage to gradually decrease the clear height or vertical diameter of the nozzles toward the outside so as to avoid any decrease of velocity of the liquid when dischargin from said nozzles. The accompanying riawing shows an example of a mixing apparatus constructedaccording to this invention, Fig. 1 being a ,central cross-section in vertical direction throughthe novel mixing apparatus, and Fig. 2 a partial horizontal section through Fig. 1 along the line A-B-thereof. As shown in the drawing, the mixing apparatus comprises a container at and a casing for the screw propeller b. This casing is composed of a plurality of flanged sectlons and mounted within said container by means of the bearing block d which rests upon the beams 0 and acts as a support for the driv of the nozzles g is relatively small and the' surface of the discharge orifice of said nozzles properly inclined towards the levelof the liquid in the container a, while the radius of curvature of the upv er portio'n'z' of the wall of the nozzles is rel tively large. More? over, the upper end of the discharge orifice of the nozzles projects somewhat beyondthe under end so as toobtain a proper inclination of the surface of. said discharge orifice. Furthermore, the vertical clear diameter of the nozzles gradually decreases toward the 106 outside so that the total cross-section of the liquid discharging from said nozzles will be equal or approximately equal to the crosssection of the annular channel is of the propeller casing which contains the propeller blades 'b. Because of this construction of the discharge nozzles and the propeller casing, the liquid will discharge at undiminished speed from said nozzles, which speed may be determined by the s ced of the driving motor e for the propeller Also, by reason of the particular shape and inclination of the discharge orifices of the nozzles the liquid will be discharged therefrom and thrown upon the level of the liquid in the container as a uniform veil of liquid in fan or umbrella-shape. The desired width of the throw of the liquid discharging from the propeller casing may now be obtained by a proper adjustment of the speed of the motor e and therewith of the screw propeller b.

I claim:

1. In a mixing apparatus, the combination with a container and a screw-propeller rotatably disposed therein about a vertical axis, of a casing surrounding said propeller, and a plurality of discharge nozzles provided on said casing being arranged in a circle around said casing and curved in a radial plane relative to said container so as to discharge the liquid in fan-shape upon the level of the liquid in said container.

2. The combination as specified in claim 1, I

in which the discharge orifices of said nozzles are of restricted cross-section relative to their entrance apertures having a cross-section substantially equal to the annular cross-section of the portion of said casing surrounding said propeller.

3. The combination as specified in claim 1, in which the clear vertical diameter of said nozzles gradually decreases toward the outside so that the total cross-section of the discharge orifices of said nozzles is substantially equal to the annular cross-section of the portion of said casing surrounding said propeller.

4. The combination as specified .in claim 1, in which the discharge orifices of said nozzles are of restricted cross-section relative to their entrance apertures, the total discharge orifice of all said nozzles having a cross-section substantially equal to the effective entrance aperture of the portion of said casing surrounding said propeller.

In testimony whereof I affix my signature.

FRIEDRICH DUWE.