US1986606A - Mixing and stirring device - Google Patents

Description

Jan. 1, 1935. A. SCHLIMBACH HIKING AND STIRRING DEVICE Filed NOV. 30, 1931 UNITED STATES PATENT OFFICE MIXING AND STIRRING DEVICE August Schlimbach, Mainz-Kostheim, Germany,

assignor to Maschinenfabrik Augsburg-Numberg A. G., Nuremberg, Germany, a corporation of Germany Application November 30, 1931, Serial No. 577,887 In Germany September 1 1931 3 Claims. (01. 2s9-9) My invention relates to a mixing and stirring so strongly that no floating mud can arise or device of the type in which a conveyor screw is continue to exist. used and which is intended especially for the The circumstance that suspension members for treatment of rotten mud. It is known that for the guide body of the circulating conveying screw 5 accelerating the process of rotting in mud or are obviated can be utilized for providing in the 5 muddy water, it is not only necessary to mix free space above the outlet body of the riser a the precipitates continually anew with the water device that prevents the escape of gas from the above them and to bring the substances in intireceptacle when the conveying screw shaft and mate contact with one another, but it is also its bearing body are removed from out of the necessary to prevent the formation of floating same. l0 mud, as arises particularly easily in rotten mud This effect is attained, according to the present because of the many organic substances (fecal invention, by providing for said bearing body substances) present therein. (which may be afllxed in the cover of the re- While with only low depth of the muddy water -ceptacle or below the same) a shell or jacket containing the rotten mud a mixing apparatus which extends from the cover downwardly to 15 having a conveying screw causing the mud to below the upper surface of the muddy water circulate in vertical direction is sufficient, in containing the rotten mud, and which remains that, in view of the slight delivery'head, such an at its place when the conveying screw shaft and apparatus is capable of bringing about the strong the bearing body for the same are removed, said surface motion requisite for the prevention of shell or jacket acting then as a closure by which 20 the enrichment of the rotten mud with floating the escape of gas through the opening in the mud, this is no longer the case if the depth is cover, when the said shaft with the screw ar comparatively great. 7 being removed, is effectively prevented.

- Now, the object of the present invention is to The invention is illustrated diagrammatically produce an apparatus of the type stated which and by way of example on the accompanying 25 will prevent very effectively the formation of drawing on which the new arrangement and floating mud and the enrichment of the rotten combination of parts mentioned in the inmud therewith also in the case of great depth of troductory part of this specification is shown the muddy water, and which is, besides, dispartly in vertical section and partly in sidetinguished by its great simplicity. Its characterview, the upper figure showing the main por- 30 istic features are these that a freely suspended tion of said arrangement, etc., including the top shaft is provided with two conveyor screws, of f h ri r, n h l w r figure howin h which the upper one rotates freely in the vessel lower end of rise! With some appertaining containing the muddy water a little below the membersupper surface of the same, whereas the lower on the drawing, 4 denotes the mixing p- 35 conveying screw is located in a guide body that tecle and d is the rise! which is po d by forms the outlet end of a vertical or practically feet b (lower figure) and d i place by p r vertical riser extending freely upwardly in said stays 0 (upper figure),these letter members being water o mud, connected with the outlet body 12 of the riser.

This arrangement and combination of p rt In the embodiment shown, the riser has a slight presents the advantage that the space above the oblique position, but it may as well be completely riser through which extend, with the known Vertieel- The Outlet b y (11 u ds a usual arrangement of said guide body. for the veil and Circulating ew 1 which is afllxed lower or circulating conveying screw, the supto a short vertical suspension shaft e on which is porting rods, as well as (in the case of the prou d a second Conveying and distributing vision of a separate guide member for the conw'f this screw being located above said 011tveying screw shaft) the holding members of e y the guide bearing, remains free for the complete- Q denotes the bearing d fer the shaft 6 5 ly undisturbed action and utilization of the stir- Which body extends from the cover 01 0f the ring effect of the upper screw. ceptacle down to below the upper surface of the The rotten mud conveyed to the upper screw muddy water and is enclosed in a jacket or shell by the lower one is freely distributed by the h which also extends down to below said surface. upper screw to all sides, without any impedi- This jacket or shell is secured to the cover of ment, whereby the surface of the mud is agitated the receptacle so that it remains in its Place when 55 containing substances some of which tend to sink in the liquid and others of which tend to collect 'andfioat on the surface of the liquid, said device comprising a relatively deep receptacle to be filled to a level near the top thereof with the liquid, a riser within the receptacle having its lower end open and disposed adjacent to the bottom of the receptacle and having its upper end open and disposed adjacent to the top of the receptacle and below but near the surface of the liquid. a screw propeller within said riser to produce a circulation of the liquid and contained substances from the bottom of the receptacle upwardly through the riser, and means separate from said screw propeller spaced thereabove and disposed near the top of the receptacle above the upper end of the riser and adjacent to and below the surface of the liquid to produce a strong surface fiow of the liquid and the substances elevated by the first mentioned mens laterally away from the location where the substances are caused to rise near the surface of the liquid by said first mentioned means, thereby to prevent the accumulation of a layer of floating material on the surface of the liquid.

2. A device especially designed for mixing and stirring rotten mud comprising, in combination, a closed receptacle of considerable depth to be substantially filled with the material to be treated, a riser within the receptacle having its lower end open and disposed adjacent to the bottom of 1,986,606 the body or is withdrawn together with the shaft the receptacle and having its upper guide-forming end open and. disposed adjacent to the top of the receptacle and below but near the surface of the material to be treated, the distance between the surface of the material and the upper end of said riser being considerably less than the distance between the top of said riser and the bottom of the receptacle, a screw propeller within the upper end portion of said riser for effecting an upward circulation of the material through said riser, and a second screw propeller separate from and spaced above said first mentioned screw propeller and above the upper end of said riser and below the surface of the material to intimately mix and distribute the material in a lateral direction thereby preventing the formation of a mud layer on the surface of the material.

3. A mixing and stirring device comprising, in combination, a receptacle for the material to be treated, a cover for the receptacle, a shell extending from the cover downwardly below the surface of the material within the receptacle, a shaft bearing body removably mounted within said shell and coacting with the inside of the wall of said shell, a shaft journaled in said hearing body and extending below said shell, a riser within the receptacle having an open upper end disposed below the lower end of the shell and in alinement therewith, and a pair of screw propellers on said shaft one disposed within the upper end portion of the riser and the other disposed between the upper end of the riser and the lower end of the shell.

AUGUST SCHLIMBACH.

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