US2599346A - Chilling roll - Google Patents

Description

June 3, 1952 Filed Nov. 5, 1947 B. OFFEN CHILLING ROLL 2 SHEETS-SHEET l IN VEN TOR. W #124 A 7' TORNE Y B. OFFEN CHILLING ROLL June 3, 1952 2 SHEETS-SHEET 2 Filed Nov. 5, 1947 INVENTOR.

ATTORNEY leaving the roll.

Patented June 3, 1952 UNITED STATES PATENT OFFICE CHILLING Rot-L fiernard Offen, Chicago, ill. Application november 5, 1947'; Serial No. 784,125 3Claims. (01.- 257-95) This invention relates to chilling or cooling r'olls for drying equipment and,;1iiore particularly, to a chilling or cooling roll adapted to chill or cool a fibrous web after it has attained a predetermined temperature. H

The chief object of the present invention is to provide a hollow chilling roll having a thin film of cooling medium therein permitting the mass of the'roll to be greatly reducedthereby eliminating the necessity of driving the roll since the fibrous web passing thereover serves to rotate the roll and to discontinue its rotation.

An object of the presentinvention is to provide a chilling roll of novel design in which a predetermined film thickness'of cooling medium such as water is maintained adjacent the interior wall of the roll. 5

A further object of the present invention is to provide a chilling roll having a scooprlike member adapted to remove cooling medium continuously from the interior of the wall to maintain a predetermined depth of continuously changing cooling medium adjacent the interior wall of the roll, and a member disposed adjacent s c yw l o a i t d ums-ad a n suc S1 face thereby providing imprgved heat transfer.

Astill further object is to provide a chilling roll in; which means are provided to control the v li e q lins medi su p d o herq in response to changes in temperature of medium A still further object is to provide a chilling r9 i c u ng.. .sQQ0ni mem r. ad pt d to rem e .c q f slme ium fr m. th i e rv i the roll, such merhbenbeing adjustable to vary the depth ofcooling Ifiediunimaintained adjacent the interior wall of'the roll. Qtherobjects of the inventionwill be readily perceived from the following description. a r

This invention relates to a chilling roll for 050 ing heated fibrous webs and comprises a rotatable Hollow roll provided With means fOl' Supplying coblifig medium Within the interior thereof. A

scoop-like member is disposed. within the roll and serves to maintain a cooling medium film of predetermined depth adjacent theinterio'i wail of the roll. The scoop-like memberisconnected to a discharge pipe to permit medium toiberemoved from the roll. Preferably, thescoop-like member is adjustable to permit" the depth of the film to be varied. A turbolator member may be ill Sed' adjacent the interiorwa11otherp11 t0 o'vercome possible slippage of water thereaga inst to'irripiove heat transfer, C'ontrol means iiiay belpro edto regulate the supply of cooling medium to the roll".

r The attached drawings illustrate preferred embodiments of myinvention, in which Figure 1 is a sectional view taken longitudinally of a chilling roll constructed in accordance with the present invention;

Figure 2 is a sectional View taken on the line 2-2 of'Figure 1;

Figure 3 is a sectional view in exaggerated scale illustrating the scoop member; I

Figure 4 is a diagrammatic View illustrating the manner in which the scoop member may be adjusted;

' Figurej is a sectional view of a modification of the present invention;

Figures is a sectional View taken on the line 6+6 of Figure 5; and V Figure 7 is a diagrammatic view illustrating the turbolator disposed adjacent the interior longitudinal wall of the roll.

Referring to the drawings; there is shown in Figure 1 the chilling roll 2 of the present invention having its'spindles 3 mountedin suitable bearings 4 disposed in the frame 5 of the apparatus', Roll 2 is: hollow and consists of end plates 6- and 1 connected by cylindrical wall 8 forming the cooling surface of the roll. As shown in Figure 1, end plate I is removable to permit the scoop member to be disposed within the interior of the roll.

A stationary supply pipe 9 for'supply of cooling medium such as Water to the interior of roll 2 extends through a spindle 3 into the interior of the roll and is supported in position at one end of the roll by a suitable bearing [0 mounted on end plate 6. The opposite end of pipe 9 may be supported by flanges I2 mounted on drain box [3 bolted as shown at I4 to the frame of the apparatus. A valve H is disposed in pipe! and may be actuated as hereinafter described to regulate the volume of water supplied to the interior of the: roll. Nozzles M are provided in pipe 9 through which high velocity jets of water may be directed against the interior surface of wall 8.

Water is removed from the interior of the roll 2 through a scoop member i5 disposed in the interior of the roll adjacent Wall 8 and supported by pipe [3 threadedly connected to discharge pipe [1. Discharge pipe I! passes through spindle 3, surrounding pipe 9' so that leaving water flows within pipe l1 and eXterio'rly of pipe 9. Pipe I1 is capped at [8 to direct leaving water through pipe I9 to drain box I3 from which itinay be discharged to a sump or sewer. It will; be appreciated pipe 9 passes through the capped portion IS; the purpose of the capped portion being to close the end of discharge pipe II. If desired, as shown in Figure 1, water in pipe I9 may be maintained under pressure by means of valve 20 disposed in pipe I9 and check valve 2I disposed in pipe 22 connected to pipe I9.

As shown in Figures 2 and 3 scoop member I5 is adjustable. Member I5 includes a scoop portion 23 threadedly connected to a collar 24 secured to pipe I6. Preferably, a set screw 25 is provided in wall 8 of roll 2 adjacent the position of the scoop portion 23. Thus, when it is desired to adjust the water thickness in the roll the scoop portion may be moved toward or from wall 8. As shown in Figures 2 and 4, scoop portion 23 may be provided with a socket 25 for the reception of a key 26. Removal of set screw 25 permits insertion of key 26 within socket 25 for desired adjustment of scoop portion 23. It will be appreciated other forms of scoops may be employed and other means may be provided if desired to render the scoop adjustable to vary the depth of the film of water maintained adjacent wall 8.

In operation, roll 2 is rotated by means of the heated fibrous web passing thereover at a speed within the range of 100 to 1200 feet per minute. At such speed, water discharged within the roll is thrown against the interior surface of wall 8 due to centrifugal forces. As the water is carried around on such surface, scoop l5 scrapes off the water from the surface and causes such leaving water to fiow through pipe I6 into discharge pipe I1 and then into pipe I9 to drain box I3 thereby removing water from the roll. Scoop I5 may be adjusted as described above to regulate the thickness of film maintained within the roll. Preferably, such film so maintained may vary in depth between to Scoop I5 is shown in a vertical position. The scoop, if desired, may be placed in a horizontal position or in any desired intermediate position and satisfactory results may be achieved.

Supplemental means may be employed for driving the chilling roll if desired, and I have indicated such means by placing a gear 26 (shown in dotted outline) on the spindle 3 of roll 2. As stated above, such supplemental equipment is not necessary due to the light weight of the present construction, but it may be employed if desired. r

In Figure 5, I have shown a modified form of my invention. Supply pipe 9 extends through an open end of roll 2 into the interior thereof, the end of pipe 9 within the roll being mounted in a coupling 21 forming a portion of duct or pipe I6. A removable member 28 is provided on the opposite end of the roll to permit installation of scoop I5 within the interior of the roll. Discharge pipe I1 extends from the opposite end of the roll through member 28, member 23 being mounted in suitable bearings 28 in the frame 5 of the apparatus. It will be noted pipe I! is not in contact with the member 28 permitting open ends in the roll. Grooves 29 may be formed in the exterior wall of pipe I! to entrap any water which may attempt to drain along such surface. Water collecting in grooves 29 drops into recess 3I and returns to the interior of the roll. If desired, a continuous groove or inside thread 29' may be formed in the wall of member 28 as shown in Figure 5 to direct water to the interior of the roll when it is in operation. Thus, if any water creeps along such surface, it is continually diverted toward the interior of the roll. No difficulty has been experienced in practice 4 due to the open ends of the rolls for the water is maintained against wall 8 by centrifugal forces when the roll is employed in operation at the high speeds customarily used.

An additional feature of this modification re sides in the turbolator 32 disposed adjacent the interior surface of wall 8. Turbolator 32 may consist of expanded metal, screening, or other suitable material. As pointed out above, water is thrown against the interior surface of wall 8 by centrifugal forces during rotation of the roll. In order to prevent possible slippage of water against such surface, turbolator 32 may be employed to provide additional friction to the surface; in addition, turbulator 32 serves as a mechanical means for carrying water around the interior of the roll. Centrifugal forces and the turbolator 32 assures that the water will be maintained about the periphery of the roll when the roll is in use. A further advantage of member 32 resides in the fact that it permits more efficient heat transfer for it breaks up or agitates water adjacent the surface of wall 8 and assures that water does not remain in a stagnant condition adjacent such surface.

It will be noted a thermostat 33 is provided responsive to changes in temperature of leaving water. Thermostat 33 serves to regulate valve II to increase or decrease the supply of cooling water to roll 2 in accordance with the requirements of the operation. At reduced speeds, water requirements are less so that the decrease in temperature of leaving water is refiected by thermostat 33 which actuates valve II to decrease supplyof water to the roll. Likewise, at higher speeds water requirements are greater so that the increase in temperature of the leaving water is reflected by thermostat 33 which then actuates valve II to increase the supply of cooling water to the roll.

Scoop I5 in the modified form of my invention is somewhat different from that shown in Figure 1. As shown in Figure 6, scoop I5 may be more in the form of a duct-like member 34 welded to discharge pipe II. Rotation of pipe I! may rotate member 34 to any desired angle; I have found that satisfactory results may be achieved regardless whether such portion is in vertical, horizontal or any intermediate position. The scoop portion 23 may be adjusted within member 34 as shown in Figure 6 by means of slots 35 and screws 36 as well known in the art.

It will be understood a plurality of scoops may be employed if desired but generally in the practice of my invention it is not necessary to employ more than one such member.

The present invention provides a chilling roll sufiiciently light in weight to permit rotation by the webto be cooled passing thereover. A desired film thickness of continuously changing water is maintained adjacent the interior surface of the roll and serves to remove the heat from the web passing over the roll. Turbolator means provided agitate such film or layer thereby assuring that no portion of the cooling medium stagnates adjacent such surface.

My invention provides a simple and eificient means of removing water from the interior of the roll, such means being adjustable to assure that a film of predetermined thickness is maintained adjacent the wall of the roll. Regulating members are provided responsive to changes in temperature of leaving water to assure that a desired volume of water is supplied to the interior of the roll, such water supply being a definite factor in load requirements.

While I have described certain preferred embodiments of my invention, it will be understood my invention is not limited thereto since it may be otherwise embodied within the scope of the following claims.

I claim:

1. In apparatus of the character described, the combination of a rotatable, hollow roll terminating in support members, at least one support member being hollow, means for continuously supplying cooling medium to the interior of the roll, centrifugal forces created by rotation of said roll urging the cooling medium against the interior wall of the roll, a stationary discharge pipe extending through an end wall of the roll and through the hollow support member, a scoop member connected to said pipe, said scoop member extending adjacent the interior longitudinal wall of the roll to maintain a desired depth of continuously changing cooling medium adjacent the interior longitudinal wall of the roll, said scoop member being adjustable to vary the depth of said medium, said pipe having a plurality of grooves formed in its exterior surface to entrap medium leaking from the roll and means on the interior of the hollow support member to return medium to the interior of the roll.

2. In apparatus of the character described, the combination of a rotatable, hollow roll, a stationary supply pipe for cooling medium extending through one end of the roll, said pipe having a plurality of nozzles through which high velocity jets of cooling medium are impinged continuously against the interior longitudinal wall of the roll, centrifugal forces created by rotation of said roll urging the cooling medium against the interior wall of the roll, turbolator means disposed against the interior wall of the roll to create agitation in the film of medium maintained adjacent thereto, a stationary discharge pipe extending through the opposite end of the roll, a scoop member con nected to the discharge pipe, said scoop member extending adjacent the interior longitudinal wall of the roll to maintain a desired depth of continuously changing cooling medium adjacent the interior longitudinal wall of the roll, said scoop member being movable toward and from the interior wall of the roll to vary the depth of the film maintained adjacent the interior wall of the roll, and means for preventing leakage of medium along the exterior wall of the discharge pipe.

3. Apparatus according to claim 2 in which the turbolator means consists of expanded metal disposed over the interior wall of the roll.

BERNARD OFFEN.

The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 971,176 Dexter Sept. 27, 1910 1,551,923 Amdursky Sept. 1, 1925 1,564,171 Brown Dec. 1, 1925 1,768,156 Schroder June 24, 1930 1,768,777 Moller July 1, 1930 1,812,802 Price June 30, 1931 1,819,988 Jones Aug. 18, 1931 1,953,525 Young Apr. 3, 1934 1,994,360 Hurxthal Mar. 12, 1935 2,041,544 Hammond May 19, 1936 2,182,981 Drost Dec. 12, 1939 2,420,824 Hornbostel May 20, 1947 FOREIGN PATENTS Number Country Date 398,611 Germany July 11, 1924

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