US1416332A - Stirrer - Google Patents

Description

saris near mast ears WARREN 0. GHAGE, OF EVERETT, MASSACHUSETTS.

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Specification of Letters Patent. P te t d M 1 1922,

Application filed. August 18, 1920. Serial No. 40,290.

the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to mixing machines or stirrers and its object is to provide a novel and more effective mixer than those in common use. I

In the drawings of the embodiment of my invention selected for description and illustration herein,

Fig. 1 is a partial vertical section;

Fig. 2, a plan the cross pieces 2 having been removed;

Fig. 3, a plan of the rotor of the mixer with the shaft in section, on the line 33, Fig. 1; and

Fig. 4c, a side elevation of the rotor with the shaft broken off for convenience.

Referring first to Figs. 1, 2, my novel stirrer comprises a tank 1, of any suitable material, as wood.

The tank is provided with a cross piece 2, also of wood which acts as a support and bearing for the rotor shaft 3, to be operated by any convenient means, not shown.

Within the tank are positioned baffle boards 4, herein also of wood, at the proper height, usually just above the rotor paddles but for best results they should be at the liquid level. These boards may be supported in any convenient manner, as by cleats 5 on the inner tank wall, each board inner end engaging the face of an adjacent board near the center of the tank, the board end having tongues 6 which enter apertures such as mortises 6", in the face of the adjacent board end being held there by pins 6*.

The rotor, Figs. 3, t, comprises the shaft 3, and the paddles 7, 8, which are secured thereto in a novel manner. The shaft is slotted at right angles at the proper distance from the lower end to receive the shanks 9 of two long shank paddles 7, the shanks being crossed at their centers by means of a conventional half joint.

Between these two long shank paddles are positioned pairs of short shank paddles 8.

'To secure or lock these paddles firmly together and to the shaft 3, I have conceived a novel construction, one embodiment of which is illustrated. Each of the long shank paddles is provided on each side face of the shank with a wedge-shaped section 9 having oppositely bevelled side faces 10, 11.

The outer end of the long shank 9 of each paddle 7 is tapered. outward again with a shoulder 12 on each side, and subsequently tapered outward to the full width of the paddle blade 13. v

The short paddles 8 are bevelled inwardly from the blades 13 as at 15, one face being a straight bevel. The opposite face is provided with a shoulder 16 opposite to and cooperating with the shoulder 12 on the shank 90f the paddle 7. and receive between them two wedges 17, 18, whichare driven home tightly. I

In this manner all the paddle shanks act to lock each other firmly to the shaft without any other locking devices or fasteners.

of any kind. Q

It will be noticed that the outer end of each paddle is bevelled, see Fig. 4, to provide a mixing or agitating blade 13 already referred to.

Mixers of this kind are especially designed to. thoroughly turn over, mix and quickly dissolve solids in light or heavy liquids. Such apparatus is particularly desired by soap, color and paint manufacturers, and oil refiners. It is also used generally by chemical manufacturers.

In these cases almost invariably such mixers must be of wood or some material that can safely be used without danger of being attacked by the chemicals. For this reason and for the above uses especially, I have invented the foregoing construction in which no metal or other vulnerable material need be used for any purpose.

In order to obtain a thorough and uniform mixing all the ingredients must be brought into constantly changing contact; each particle must be made 'to' change its relative position and made to circulate through and not with the mixture as a whole.

In mixers having a rotating arm in the horizontal or vertical plane only, the contents of the tank are set in horizontal motion and a swirling effect is obtained, the whole mass gy-rating about the center as a whole, but not giving the mass a thorough and even mixing.

One purpose of this mixer or stirrer is to prevent as far as possible the horizontal flow liquid.

of the mass and to produce a pronounced vertical flow.

By the action of the inclined blades rothus all the different particles are continu-' ally changing their relative positions and are constantlybeing turned over and over, becoming a a: perfectly homogeneous mass. By this means the solids are effectively dissolved, and moreover, prevented from set-- tling on the bottom of the tank, which is not the case where the agitation simply produces a horizontal motion or swirling effect of the The blades should not, be long enough to prevent the formation of an up- Wardly directed current of the mass between the blade end and the tank wall.

The baflie boards at the top of the mass and in combination with the downward pull I exerted by the blades at the center of the mass, tend to still further break up any pronouncedrotary motion of the liquid as a whole, and create" furthermore a separate downward current at the center of the tank for each compartment formed by the baffle boards. The efficiency of the baffle boards in this respect appears to be due to the fact that they are extended from the wall of the tank to the center thereof, thus forming in fact a battle board extendin throu hout the tank at or near it surface, and assist in augmenting the vertical flow of the liquid near the center of the tank and about shaft 3.

I By increasing the speed of the rotor, violent agitation is obtained. and by proper regulation of speed a thorough agitation of almost combination of ingredients can be had.

While I have described one embodiment of my:;invention it will be obvious that the sameis not limited in all detailed respects to the construction illustrated.

Claims:

l 1. In a rotor, a shaft, aplurality of padidles of varying length locked thereto in substantially the same horizontal plane, the long paddles having shanks extended through the same, and a plurality of short paddles wedged between the long paddles and thereto.

l. In a stirrer, a rotor comprising a shaft, a plurality of long paddles secured thereto and a plurality of short paddles wedged between the long paddles and against the shaft."

5. In a stirrer, a rotor comprising a shaft,

a plurality of two blade paddles secured v I thereto and a plurality of one blade paddles secured between the two blades paddles.

6. In a rotor, a shaft, a plurality of paddles having shanks with uniform side faces and a plurality of paddles having shanks with non-uniform side faces engaging the former shanks.

7. A stirrer comprising a tank, and a rotor comprising a shaft, a plurality of paddles secured to the same, and a plurality of baffle boards in and extended across the diameter of the tank and above the paddles.

8. In a stirrer, a rotor comprising a shaft, a plurality of long paddles secured to the same, a plurality of short paddles wedged between the long paddles, and wedge members locking them therein.

9. In a stirrer, a rotor comprising a shaft,

a plurality of paddles, a locking shoulder on each paddle shank, and'a wedge for locking the shanks together and to the rotor.

10. In a stirrer, a rotor comprising a shaft, a plurality of paddles having one shank face bevelled in one plane, and the op posito shank face bevelled in a plurality of planes.

11. In a stirrer, the tank 1, havingbafile boards lextended the full diameter thereof, the shaft having thetwo blade paddles 7, and the single plade paddles 8 thereon, and the wedges 17, 18, for locking the paddle to each other and to the shaft.

In testimony whereof, I have signed my name to this specification.

WARREN o. oral-ice.

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