US2267317A - Apparatus responsive to the viscosity of fluid material - Google Patents

Description

Dec. 23, 1941. v. v. VEENSCHOTEN 2,267,317

APPARATUS RESPONSIVE TO THE VIS COSITY OF FLUID MATERIAL Filed Sept. 5, 1936 2 Sheets-Sheet 1 f76. 2. 2; W 46 INVENTOR.

A TTORNEYS.

Dec. 23, 1941. v. v. VEENSCHOTEN 2,267,317

APPARATUS RESPONSIVE To THE VISCOSITY OF FLUID MATERIAL Filed Sept. 5, 1936 2 Sheets-Shet 2 IN VEN TOR.

Q ATTORNEYS.

Patented Dec. 23, 1941 UNITED STATES PATENT OFFICE APPARATUS arsronsrvn 'ro rm: VISCOS- rrv or rwm MATERIAL Vincent V. Veenschoten, Erie, .Pa., assignor to Northern Equipment Company, Erie, Pa., a corporation of Pennsylvania Application September 3, 1936, Serial No. 99,262

4 Claims.

In some industries, such as paper making, it

is important to control the consistency or peris important to control consistency or percentage of fiber in the mixture of fiber and water. It is common to move the stock through a conduit and to vary the water so as to maintain the amount of water flowing with relation to the fibrous material. Such flowing stock, however, varies very materially at different levels. It is important, therefore, in controlling the consistency of the entire flow of material that the average viscosity throughout all the levels be considered in obtaining a proper control for the entire mass flowing. In obtaining this response to" of peculiar value in that they free themselves from or do not accumulate the fibrous material so as to change the response of the discs andtheresistance to movement of the discs through the material and consequently the response to such resistance in maintaining control. With such an apparatus a very accurate control may be accomplished.

A preferred embodiment of the invention is illustrated in the accompanying drawings, as follows:

Fig. 1 shows an elevation of the "apparatus partly in section.

Fig. 2 a section on the line 22 of Fig. 1.

Fig. 3 a plan view of the apparatus.

Fig. 4 an enlarged view of the motor for actuating the controlling means.

I marks the container for the fluid material. 2 indicates the fluid material which is normally maintained at level A-A. The apparatus is mounted on a frame having side bars 3 and cross members i and 5. The frame is supported on cross-members 6 secured to the sidemembers 3 and to the sides of the container I. A modifying supply of liquid is provided in the pipe I. A control valve 8 is arranged in this Pipe, the valve being of the common cylindrical balanced valve type. A fitting 9 is secured to the lower end of the valve and to the cross member 5. A pipe I ll extends from the fitting 9 into the container I,

the lower end of the pipe being supplied with per-. e forations II for delivering modifying fluid to the fluid material in thecontainer, the modifying fluid being, in most cases, water. The valve 8 has a flange extension I2 on which a frame plate I3 is secured. Frame rods extend from the plate I3 and are secured to and support a motor cylinder I5. The motor cylinder is provided with a piston I6, and piston rod Ilextends from the piston through'a gland I8, 'andis secured to a head "a. .A stem I'Ibextends from the head I'Ia .A valve 22 has controlling members 23--23,'one

for each port, these members being rigidly connected, and is provided with. a valve stem 24. Liquid under pressure is delivered from any convenient source to the valve chest through a port 25, and the chest is provided with exhaust ports 26, one at each end. With this valve mechanism it will be noted that when the valve is on center, both ports 20 are closed. Consequently the piston is looked through the closure of the ports in its then adjustable position. With the valve moved in one direction or the other, liquid is exhausted' from one end of the piston and admitted to theopposite end of the piston so as to move the piston until the valve is closed.

' A lever 21 extends through the head Ho and is pivoted thereon by a pin 28. The lever'z'l is pivotally connected by a pin 29 with the valve rod 24. The upper end of the lever is connected by strap 30 with a pulley 3I.- The pulley 3I is fixed with a field ring 32 of a motor 33. The ring is journaled on the rotor shaft 34 of the motor and the rotor shaft 34 is rigidly mounted in a,

stem 35. The stem 35 is journaled in ball bearings 38. 31 secured to a base plate 4. The stem 35 has an extension '38 which extends down into the container I and into the material 2.

A series of discs 39 are arranged .on the extension 38 and separated by distance spacing sleeves These discs- I ball bearing 36. The whole assembly is clamped up by a 'nut 42, at the lower end of the extension 538. Conduit fittings 43 are mounted on the The ball bearings are mounted in a post" range there is quite a wide divergence.

frame and wires 44 for the motor are carried through the fittings and to the motor.

The pull of the field ring communicated through the strap '30 to the lever 21 is resisted by weighted lever 45 of fork form, the sides of the lever being pivoted by pins 46 at the sides of the cylinder. The upper end of the lever 45 is connected by a link 41 to the lever 21. A weight arm- 48 extends on an angle from the lever 45. A weight 49 is adjustably mounted by set screws 49a on the lower end of the lever 45, and a weight 50 is adjustably secured by set screws 50a on the arm 48.

The motor is designed to run at a constant speed. The frictional resistance of the discs on the material varies with its viscosity.v The reaction pull of the field ring to this resistance is communicated through the strap '30 to the lever 21. This pull is balanced by the weights on the lever 45. The build-up of effective action of the weights may be varied through their adjustment. The movement is steadied by the inertia mass 5|.

As the lever 21 is operated in response to changes in the resistance to movement incident to the frictional engagement of the discs with the material, it moves-the valve 22 to admit liquid to one side or the other of the piston, depending upon the variation in. resistance, and so closes or opens the valve 8 to reduce or increase the inflow of modifying liquid necessary to maintain a constant consistency of the fluid'-material. As the piston moves inresponse to the opening of the valve it carries the head "a with it and this moves the lever 21 so as to move the valve back to its central position. This combined movement finds a position of the piston and consequently the valve to supply the proper I amount of modifying consistencies. The pull reaction of the field will balance the weight setting on the lever 45 only when the consistency is such as to createa. reaction pull by the field that will balance the weight setting of the lever at the neutral position. 7

It will be understood that where the invention is used' with relation to liquids for paper making consistency is an ultimate object. The frictional action on the discs varies in substantially direct ratio to the viscosity of the liquid. Through certain portions of the range the variation of the consistencyand viscosity is almost identical whereas through other portions of the Inasmuch as friction varies'directly astheviscosity and the viscosity and consistency do not follow exactly the same curve it is desirable to have the weight which isopposedto the frictional torque resistance adjustable. so that it may be made to follow in its variation in resistance the consistency curve. This being so the liquid will be varied according to this control to maintain a viscosity which will correspondto the consistment to diiferent relations to the pivotal center it is possible to,feffect a curve of resistance to movement by the weights corresponding very closely to the consistency curve incident to variations in the consistency of the material.

being substantially parallel to the direction of movement of the elements making the wiping friction between the material and the elements the major factor in resistance to the movement of the elements, said elements operating at different portions of the material at different levels and being distributed through said levels of the liquid to reflect the average viscosity of the flowing material; and mechanism responding to the frictional pull of the liquid material on the contact surfaces of the elements and through such response reflecting the average condition of the material.

2. In an apparatus of the character described, the combination of a conduit for conveying a liquid material; a plurality of moving elements in the path of the material presenting only contact surfaces to the material parallel to the direction of movement of the elements and responding substantially to the wiping friction between the material and the elements alone in resistance to movement of the elements, said elements operating at different portions of the material at different levels and being distributed through said levels of the liquid to reflect the average viscosity of the flowing material; and

mechanism responding to the pull of the liquid material on the elements and through such response reflecting the condition of the material.

3. In an apparatus of the character described, the combination of a conduit for conveying a liquid material; a plurality of rotating elements in the path of the materialpresenting only frictional contact surfaces to the material, said surfaces conforming substantially to the surface of revolution on the axis of rotation, making the wiping friction between the material and the elements the major factor in resistance to the movement of the elements, said elements operating at different portions of the materialat different levels and being distributed through said levels of the liquid to reflect the average viscosity of the flowing material; and mechanism responding to the frictional pull of the liquid material operating at diiferent portions of the material at different levels and being distributed through saidlevels of the liquid to reflect the average viscosity of the flowing material; and mechanism responding to-the frictional pull of the liquid material on the contact surfaces of the discs and through such response reflecting the condition of the material.

VINCENT v. VEENSCH'OTEN.

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