US1464150A - Stirring apparatus - Google Patents

Description

Aug. 7, m3. mmwm F. DE DIIETRICH STIRRING APPARATUS Filed July 6, 1921 Patented huge 7, tea

untrue FREDERIC nn. DIEETRICH, 0F PARIS, FRANCE, ASSIGNOR TO) BE DlllETETGH 8: (STE, 015' NIEIDEBERONN-LES-BMNS, EAS-EIBIIN, FRANCE, A GOEEOBAT ION @Ie" TRANCE.

surname .arranarus.

Application filed July 6,

To all whom it may concern Be it known that l, Fnnun'nro on DIET- nronr, citizen of the Republic. of France, residin at 16 Rue Gustave Zede, Paris, Seine, rance, have invented certain new i and useful Improvements in or Relating to industry needs apparatus by means of which lid the substances to undergo treatment can be intimately mixed.

The roblems that present themselves are as varled as the substances to be treated. For each particular case, it has been necessary to construct stirrers that will suit the conditions presented. I

To efiect the mixture of, or to commingle intimately two li uidsof diilerent specific .weights so that t e one can react on the other, is in particular, one of the most dit ficult problems to settle.

Apparatus employed up to the present for solving this problem has the drawback of causing a great expenditure of motive force. In fact, the heater or stirrers ot the apparatus meet with a great resistance since they have to turn at very great speed to prevent the-heavier liquid sinking to the bottom of the containin vessel. I

The problem is stil more complicated when the heavier liquid is used in a relativelp rers small quantity. The heaters or stireing necessarily a short distance from the bottom of the vessel donot succeed in raising and carrying along the heavy liquid. The invention relates to a stirrer essentially characterized by the fact that it enables, with a, minimum expenditure ofmotive force, the intimate mixture or two liquids of difierent specific gravities to be effected, the heavier liquid being easily captivated at the bottom of the vessel and projected into the mass of the lighter liquid, whatever may be the relative proportion of the two liquids.

lln the accompanying drawing, given by way at enamplez- Fig.1 is a vertical section of a stirring 1921. Serial N0. 482,690.

ipparatus arranged according to the invenion. I

Fig. 2 show a modification of the stirrer itself.

The apparatus comprises a stationary vessel 1 having a coned bottom 2 and a hollow stirrer substantially of ogivalform (Fig. 1) or of cylindro-ogival (Fig. 2) or even conical shape, whose pointed end a, pierced with an orifice 5, is disposed in the immediate vicinity of the lower part of the portion 2 in which the heavier liquid is accumulated to a level so much the higher as the conicity of the bottom portion 2 of i the vessel is more pronounced. Urifices 6 are provided in the wall of the stirrer and a circular rib or projection 7 is formed on the outside of the stirrer just below the orifices 6.

The stirrer or agitator v, is supported and operated by means of a spindle 8, which is mounted in any appropriate manner and on which is fixed a frictional or toothed bevel wheel 9 that is in contact or mesh with a similar member 10 adapted to be operated by the driving shaft 11. m

U11 turning rapidly about its vertical axis, the stirrer 3 drags along by reason of triction, the liquid contained in the vessel 1, and also the liquid contained in the interior of the stirrer; The surface of the liquid in the vessel and in the stirrer assumes the forms shown in l i l. p

The heavy liquid L is thus caused, by centrifugal force to rise along the internal wall of the stirrer as indicated by the arrows and to reach the level of the orifices 6 through which it is projected to the outside in very smalldrops which, after traversing the space of air between the outer wall of the stirrer and the surface of the light liquid in the vessel, penetrate into this liquid with a velocity equal to the tangential velocity of the-stirrer and then return to the bottom of the vessel follow mg a spiral course through the light liquid. This has the sheet of prolonging the time during whichthe heavy liguid, in yer-y divided condition is in intimate contact with the light li%id. a

a hi dividing up of the heavy l1 quid and till llllll the prolonged time of contact between the two liquids are very favourable for promoting chemical reactions. The How of a portion of the heavy liquid, owing to adhesion, along the external wall of the stirrer isbrezndered impossible by the projection or r1 The power required for this stirrer is insignificant compared. with what is requi- --site in knownsystems, since, in spite of the great speed ofrotation, friction between the stirrer and the liquid is diminished considerably for the two following reasons:

1.The liquid turns "with a speed which is nearly equal to that of the stirrer, consequently the relative speed between the two elements is very small.

2.-The quicker the system turns and the more the exterior of the stirrer is freed of or out of contact with the liquid whose sur face takes the form of a paraboloid of revolution whose vertex is so much the nearer to the point-of the stirrer, as the speed of the latter increases.

-Under these conditions, friction between the stirrer. and the liquid is partially replaced by friction between the stirrer and air the air effecting much less resistance.

' 'ihe apparatus can be constructed of any appropriate materials, and in particular of enamelled iron.

' What I claim is:

1. The method of stirring two liquids of diiferent specific gravities, which consists in confining the liquids in a suitable container, producing a vortex in the upper part of the liquid and simultaneously withdrawing heavier. liquid from the bottom of the container and projecting it horizontally from pointswithin the hollow of the vortex at acute angles to the sides thereof, whereby the heavier liquidis caused to travel downwalii through the lighter liquid in spiral pat 2. The method of stirringltwo liquids of different specific gravities, which consists in ,confining the liquids in a suitable container and sub ecting them to the action of a rapidly rotating hollow member having an orifice in its lower end and suitable lateral discharge orifices, whereby a'vortical motion of of the liquid and simultaneously withdrawing the heavy liquid from the bottom of the container and projecting it in a number of fine streams laterally from oints Within the vortex and at acute ang es to the sides thereof.

4:. A stirring apparatus of the kind described comprising a receptacle adapted to contain liquids of difi'erent specific gravities, and a hollow member rotatably mounted in said receptacle on a vertical axis and extending to a point close to the bottom of said receptacle, said hollow member having a narrow orifice at its lower end and a plurality of small lateral discharge openings adjacent its upper end and having a smooth unobstructed interior, whereby when said hollow member is set in rapid rotation the heavier liquid from the bottom of the re ceptacle flows up along the inner walls of said member and is projected through said discharge openings in a number of fine streams into the body of the li hter liquid. 5. A stirring apparatus of t e kind described comprising a receptacle adapted to contain liquids of different specific gravities, and a hollow member rotatably mounted in said receptacle on a substantially vertical axis and having a tapering end open at the bottom extending close to the bottom of said receptacle and having a series of small lateral discharge openings adjacent its upper end, the interior of said hollow member be ing entirely unobstructed.

6. A stirring apparatus of the kind described, comprisin a receptacle having a conical bottom an having a circular cross section throughout with smooth unobstructed interior walls, a hollow member of substantially ogival shape disposed in said receptaclesubstantially coaxial therewith, the lower end of said member being open and disposed close to thebottom of said receptable and said member having a plurality of lateral disch'ar e openings adjacent its upper end, a sha of said member and means for rotating said shaft.

7. A stirring apparatus for mixing liquids of difi'erent specific gravities, compris ing a receptacle for the liquids having a circular cross section throughout with smooth unobstructed interior walls, a hollow member having a closed upper end and a tapersaid member being open and disposed close to the bottom of said receptacle, said member being of circular cross section and havattached to the upper end .ing lower end, the lower or smaller end of ing smooth unobstructed interior walls and said member having a plurality of small lateral dischar openings adjacent its upper end, a sha attached to the upper end of said member and means for rotating said cular cross section with smooth unobstimoiod interior Walls, a hollow member having a taporing lower end with a small orifice thorom disposed closg to the bottom of said reooptacle, said hollow member beingof circular cross section with smooth unobstruclued interior Walls and having a number of small discharge openings adjaoeni; its upper end and having an annular rib located holow said openings, and means for rotating said 1 member. 1

In testimony whereof I afix my signature.

Witness JEAN Lam-0mm.

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