US1854881A - Agitator - Google Patents

Description

J. E. BOND April 19, 1932.

AGITATOR Filed April 8, 1929 Arl M Ali Patented Apr. 19, 1932 UNITED STATES JOSEPH E. BOND, OF .APPLETON, WISCONSIN AGIT'ATOR Application filed April S, 1929. Serial No. 353,565.

My invention relates to the art of paper making and particularly to means for agitating paper pulp.

In the development of the art it has been l Jfound possible to greatly increase the capacity of a given equipment by increasing the density (or, in other words, lessening the fluidity) of the pulp during its treatment preceding delivery to the Fourdriniers. While in the old practice a 21/2% pulp was considered proper and of the maximum density possible, it is now common to deal with 6% solutions, with correspondingly increased production capacity. v

However, many difficult problems are en countered in handling` pulp of this vdensity due to its lack of fluidity and its tendency to mass or cake in the storage or treatment tanks and containers; This tendency is inherent in the nature cf the material under treatment due to its fibrous character and to the physical law of attraction of solids. The liquid within which the solids are carried serv-es merely as a'supporting medium therefor and facilitates rather than hinders the massing and intertwining of the fibers.

To avoid massing and stratifying of the pulp in the liquid and to maintain a uniform density throughoutthe entire body of material, it must be kept in motion and the motion producing means should have a tendency to reak up and tear apart any large or small masses of pulp. In the old practice the miie ture was kept in motion by means of paddles V or impellers in the tank, but this apparatus had very little tendency to break up masses of pulp, and was wholly ineffective with stock of increased density. Furthermore, such apparatus required an outlay of power not ccmmensurate with the results secured.

The tanks, chests or containers which are in place and must be utilized for the new plan of operation are of many and varied forms, all of great size, some narrow and of great length, some deep and some round. The problem has been, therefore, to provide means applicable to these various forms of tanks that would insure effective circulation, the breaking up of pulp masses and the maintainance at all times of a proper consistency throughout the whole volume of material, with a minimum of power expenditure.

My invention embodies also the combination with a novel pulp agitating means vertically disposed and located entirely within the walls of the chest. By locating the agitating means entirely Within the chest, consi-dera'ble expense is saved in the construction of the chest. Also due to this fact, any number of variations in the agitator may be effected without the necessity of any alteration in the design of the tank. The agitator is constructed especially with a view t0 simple and ready inspection and replacement of bearings, the motor and impeller being disposed vertically rather than horizontally as has been the practice.

My invention will be more readily understood by reference to the accompanying .drawings, in which:

Fig. 1 is a plan view of an agitator conn structedin accordance with my invention;

Fig. 2 is a transverse sectional view on the line 2 2 of Fig. l;

' Fig. 3 is a transverse sectional view of the agitating pump.

In the drawings, I have illustrated a tank or container of generally rectangular form, having side walls 10, a floor 11 and end walls 12, 13 which may be formed of concrete or other water impervious material. Large fillets are provided at the junction of the side walls and floor in order to facilitate the circulation of the mass.

Extending longitudinally of the tank Vin the center thereof is a division wall 14 dividing the tank into two compartments 15, 16. The wall terminates short of the end wall 13 of the tank and at the point of termination is laterally projected as at 17, 18 to provide a baille. 'The floor in the discharge compartment 15 is constructed to slope down toward the end wall 13, and the floor in the compartment 16 is constructed to slope down from the end wall 13 toward the end wall 12, thus insuring a. movement of the stock at all times by gravity.

At one end of the tank is the well disposed vertically in one of the two chambers of the chest. The pumping unit comprises the m0-- tor 19 resting on the pedestal 20, casing pipe or well 21, suction pipe 22, hanger pipe 23 having the hand-holes 24, 25 and covers 26, 27. The vertical shaft 28 secured to the coupling 29 extends through the thrust bearing 30 to the bottom of the casing where it is connected to the impeller 31. The lower eX- tremity of the hanger pipe 23 is provided with a stuffing boX 32 to prevent drawing any foreign matter inside the hanger pipe.

At suitable points in the length of the well, I provide the vertically split Babbitt bearings 33, 34 within the bearing casings 35, 36. The bearing casing 35 is supported in the machined joints 37 in the hanger pipe. The oil pipe 38 extending from the top of the well provides lubrication for the bearings 33, 34.

Thus it is seen that I have constructed a .pump which it is very easy to keep in repair. If desired to replace Babbitt bearings, the covers 26, 27 may be removed from the handholes 24, 25 and the split bearings may easily be grasped and removed. If the bearing casing needs repair, the top Hanged section of the hanger pipe may be simply lifted off the lower section.

As best shown in Fig. 2 the well is so constructed that the suction pipe 22 is below the bottom lever of the chest. The stock is drawn upwards by the impeller 31 and discharged through the discharge pipe 39 which extends through the division wall 14 to any desired point in the opposite chamber of the chest. If for the purposes of better circulation of stock it is desired to discharge the stock at a certain angle, or near the opposite end, elbows may readily be secured to the discharge pipe 39. To facilitate delivery of stock I provide the discharge pipe 40.

From the above description of my inven tion, it will be readily seen that I have provided a chest for agitating paper stock in which there `is a perfect, constant movement of the stock insuring proper consistency and preventing stratification by means of a novel well which is easy to maintain, and cheap to install.

Obviously modifications and variations may be made in the structure and design of the invention here disclosed, and I do not wish vto be limitedexcept as indicated in the appended claims.

I claim:

l. In combination, a tank, a division wall extending longitudinally from one end of the .tank and .terminating short of the other end thereof, means providing a well vertically disposed within the well, an impeller connected to the shaft and mounted at the lower end of the wel-l, means providing a discharge outlet at a point near the upper end of the well, and driving means connected to thefshaft above rthe liquid level of the tank.

2. In combination, a tank, a division wall z extending llongitudinally from one end of the tank and terminating short of the other end thereof, means providing a well vertically disposed within the well, an impeller connected to the shaft and mounted at the lower end of the well, means providing a discharge outlet at a point near the upper end of the well, said discharge outlet being disposed into the side of the tank opposite from the side in which the well is located, and driving means connected to the shaft above the liquid level of the tank.

3. The combination, with walls forming a tank, of a division wall extending longitudinally and substantially along the center of the space within the tank and terminating short of the end thereof in a lateral projection, a vertically disposed well located within said tank at one end thereof, said well having an inlet near the floor at one side of said division wall, and a discharge pipe near the top of said well and projecting into the space at the opposite side of the said division wall, said discharge pipe terminating at a higher level than said inlet.

4. In combination, a tank having a wall dividing the space therein into two compartf ments in open communication at one end only of the tank, a vertically disposed well with.- in said tank and at one end thereof, means providing an inlet at the lower level of a compartment at the end of the tank opposite to that end at which there is communication between compartments, and means providing a discharge into the opposite compartment at a different level than that of the inlet.

5. In combination, a tank having a wall dividing the space therein into two compartments in open communication at one end only of the tank, a vertically disposed well at one end of said tank, means at the end of the tank opposite to that end at which there is communication between compartments providing an inlet at the lower level of one compartment and a discharge pipe projected through the dividing wall and adapted to T discharge into the adjacent compartment of said tank, said well being located entirely within said tank.

6. In combination, a tank having a division wall, a pulp circulating unit mounted in the tank, said unit having an inlet at a low point in said tank at one side of said wall and an outlet at a high point in the tank on the opposite side of said division wall, said unit consisting of a vertically disposed pipe, an

im-peller at the lower end thereof. a motor rested on the upper end of the pipe above the level of the tank and a vertical shaft directly connecting the motor and impeller.

In testimony whereof I have aiiXed my i signature.

JOSEPH E. BOND.

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