US1085939A - Drying apparatus. - Google Patents

Description

T W. E. PRINDLE.

DRYING APPARATUg.

APPLICATION FILED NOV. 11, 1912. I

Patented Feb. 3,1914. 2 SHEETS-SHEET 1 1 .0," v o w :U H W u mwwvww Ml 1 4 in: 1 z w x w m w Id l. Y K K n W. E. PRLND-LE. DRYING APPARATUSJ APPLICATION FILED NOV. 11, 1912.

Patented Feb. 3, 191

2 sums-sum 2.

UNITED STATES PATENT orrron;

WILLIAM rnrnnrin, or MAnIroWoc, Wiscons n.

, DRYING APPARATUS.

Specification of Letters Patent." Patented Feb. 3, 19 1 1.

Original application filed lfebmary 28, 1912, Serial No. 63 4. Divided and this application filed November To all whbroit may concern Be it known that I, WILLIAM E. Pninnm, a citizen of the United States, and a resident ofManitowoc, in the county of Manitowoc and State of. Wisconsin, have invented certo animproved type of mechanical drier adapted for use in dryingwet material; and

- is a divisional application of my co-pending application for a drier, Serial No. 680,464, filed February twenty-eighth, 1912.

One of the principal objects of my inven-' tion is the provision of an improved drying apparatus wherein high temperatures are eifectively employed and applied where the material is wet and .cold,fcorrespondingly reduced temperatures where the ma-.

terial is partly dried, and low temperatures where the dry'ingis completed; and another objectof my invention the provision of novel means in a drier adapted to control the admission of cold air therein 1 forthepurpose of quickly cooling downthedrier when desired. Y

These together with such other ob ects as may hereinafter appear or are.v incident to my invention I- attain'by means of a con s'tr'uotion illustrated 'whereimg I Figure-Lisa longitudinal sectional v ew of my improved,- apparatus; the cylinders therein being shown ,broken away in order to accommodate the figure in the-drawing.

Figure 2 is a modification of the structure in Figure 1'. V

Figure 3 is an enlarged sectional view of" the rear, end ofthe drier as shown in Figure 1.

Figure dis a rearelevationof Figure 1.} gure 5 is a section'through the appara-.

Fi tus on the line II of Figure A Broadly s eaking, the: invention cemprises the app ication of graduated temperatures to the material in thejdrier, ranging from the desired high temperature at a point .where the wet and cold material en'- ters, to a correspondinglylow temperature toward the rear end of the daierwherethe material is in a drystate, such application" resulting the material vbeing discharged as a umformly dried product and without the occasionrequires.

dried material to any suitable depository. iC en-t-rally suspended within the drier 6 is I Serial No. 730,569.

is'ian improvement on the method adopted in the type of drier commonly in use.- In a more exclusive sense the present invention purposes to providenovel means in an apparatus of the character described whereby the interior-of the drier can be quickly and positively cooled down to any desired extent .as

In carrying out my invention, as illus- 'trated in the preferred form in the ac co1npanying drawings, I provide a drier shell or outer cylinderfi preferably lying at an angle to the horizontal, and adapted to have rotation through a gear 7 thereon having driving engagement with .a pinion '8 mount-- cd for movement on thelbase 9 and driven from any suitable source ofpower at hand. The rear or discharge end of the cylinder has free rotative movement within a flanged hood l0 securely mounted on a base 11 and further held in position by the braces 12, the said hood being. conformed to entirely in, close the rear end of the cylinder any.longi 'Si) tudinal creeping thereof being provided against through thrust rollers 13-, which bear against vertical shoulders of tires peripherally formed on the drier.

The hood 10 at the rear end of the drier;g5 is further provided with a discharge hop" per 14 leading from the discharge'end of the cylinder-to a receptacle 15 within which I provide a conveyor l6-for conveying the M an niner hot air conveyor 17 extending longitudinally therethrough, and having its" rear end 17 projecting through the hood 10 and its forward end 17 in communication 5 with a'tempei'ing or furnace chamber 18,

or other source of heat, preferably through a fixed extension; 19 about which it is adapted to rotate. Y

- Surrounding'theforward end -17 of the oo inner cylinder and providing a bearing 4 therefor, is a stationary bonnet 20 mounted on a base 21 and having connection with an exhaust. fan 22 by means of a funnel 23.

The bonnet, which carries a feeding member 2'4, opens into the feed end of the drier,

and an annular shoulder-interiorly formed on the drierfrustum connection 25'ro'tates about a bearing surface on the bonnet.

The hot air'conveyeris suspended within which have their outer extremities bolted to the inner walls of the outer chamber. The

inner portion ofthe spider 26 is fastened to the outer walls of the inner cylinder so that both cylinders have similar rotative movement, and the inner portion of the spider 27 carries a ring 27 having periph eral contact only with the inner cylinder in order to allow for any expansion or con- .traction of the cylinders.

Arranged at intervals along the length of the inner chamber are a series of outlet openings 28 which are preferably protected from the material in the drier by elongated hoods 29 which have their openings directed toward the rear end of the drier. This arra'ngement permits the heated air which enters the conveyer from "the tempering chamber to pass through ,the hooded openings,

7 and also affords opportunity for the highest temperatures passing through the outlets adjacent the feed end to come directly in contact with the material which at this point is .wet and cold. The heated gases circulating in the drier and also passing through the conveyer gradually part with their heat through absorption and radiation, so that moderating temperatures are applied to the partly dried material on its progression rearwardly, graduating to comparatively low temperatures at the rear end where the drying operation is completed. The suction fan creates and maintains a constant circulation of heated air passing through the entire series of outlets to the material as it is cascaded, the heated air moving at constantly decreasing velocity and at diminishing temperatures as the material in its progression toward the hopper becomes drier and lighter until the material is finally discharged amid gasesof a very low temperature moving at a very low velocity.

The wet material is first fed into the front end of the drying chamber through the spout 24c and during the revolving of the apparatus is cascaded by the longitudinal lifting blades 30 bolted on the inside of the drying chamber and the lifting blades 31 similarly secured to the outer walls of the inner cylinder.

Referring now more particularly to Figure 3 it will be seen that the inner cylinder has its walls perforated for a slight portion of its length to provide a series of annular ports 32, the ports being located within the drier andin close proximity to the hood, and

' surrounded and protected against the entrance of foreign matter by a shield 33 having its opening 34: facing rearwardly. These ports normally serve the same purpose as the outlets 28, but they also have an additional function as will be explained.

, In this connection I provide a reciprocating piston 35, within the conveyer and ad-' jacent the rear end thereof, to normally close the opening inthe projecting end which opens to the atmosphere. This piston carries a rod 36 operating in guide members 37, 37, which rod is adapted to impart longitudinal movement to the piston inwardly to a position either in part or wholly past the'ports 3'2, permitting the induction of cold air into the drier by the suction fan to any desired extent through the said opening- 1'7 and the ports 32. It is apparent then that the piston has movement to and from operative position to open and close the ports, and is provided to regulate temperatures and control the' admission of cool air in the drier.

The modified construction as disclosed in Figure 2 shows the tires 7 peripherally mounted on the projecting ends 17 and 17 of the conveyer 17 instead of on the outer shell as in Figure 1. arrangement is simple and economical, and is particularly advantageous when applied to the smaller makes of drying machines.

Having thus described my-invention and illustrated-its use, What I claim to be new and desire to secure by Letters Patent is the following I 1. In a drier, the combination with aninclosed drying chamber provided with a feed member and a discharge outlet, of an inner cylinder having one end thereof leading to a source of heat and its other end extending through the drying chamber, and means to provide communication between the inclosed drying chamber and the atmosphere through the inner cylinder.

2. In a mechanical drier, of a closed outer shell, an inner conveyer having communication at one end with a source of heat and having its other end opening outwardly through the shell to the atmosphere, said inner conveyer being provided with outlet openings in itswalls, and means to control the admission of cool air into the drier through the said conveyer.

It is obvious that this improved the combination 3. In a drying apparatus, the combination air cylinder having one end thereof opening.

to the atmosphere and provided witha port in its walls affording a passage for the hot air therefrom to the drying shell, and a piston in the cylinder normally closing the opening in the rear end thereof and mounted for Operative movement substantially to a position past the said port.

, closes the rear end thereof and when moved to operative position admits cool air into the drier through said ports.

6. In a drier, an outer shell, an inner hot air cylinder projecting through the outer shell andhaving that portion of its length within the shell perforated for the passage of hot air to the outer shell, a piston inthe cylinder, and means to actuate the piston.

7. In an apparatus of thecharacter de Y scribed, an outer cylinder having a feed -member and discharge means, an inner cylinder suspended therein having communication with a source of heat and having one end thereof opening to the atmosphere, the walls of the said inner cylinder being perforated to provide a communicating passage for the heated air to the outer cylinder, an annular shield surrounding the said passage havingits opening facing in a direction toward the discharge end of the drier,- and reciprocating means in the inner cylinder which on actuation opens and closes the said passage to the atmosphere.

8. In a drier, the combination of an inclosed drying chamber provided with a feed member and a discharge outlet, an inner cylinder communicating with a source of heat and lying in the drying chamber, and

means to provide communication between the; drying chamber and they atmosphere through the inner cylinder. v

9. In an apparatus of the character described, an outershell, an inner cylindrical conveyer extending through the walls of the shell, one'end thereof communicatingwith a source of heat and the other end opening to the atmosphere, said conveyer being provided with a series of guardedair passages in its walls leading to the outer shell, and

reciprocating means to open and close the open end of the conveyer, whereby cool air is admitted into the outer shell through the said air passages, substantially as described.

10. In a rotaryidrier, the combination of an outer inclosed shell havinga feed opening at its forward end and a discharge outlet at its rear end, an inner hot air conveyer extending through the shell and provided with an opening at its forward end leading to a source of heat, said conveyer having its walls perforated at intervals along its inclosed length and soarranged that highest-temperatures are directed tomaterial when first fed into the interior of the drier with the application of correspondingly diminishing temperatures to the material as it parts with its moisture, and a controlling member normally closing the rear and of the conveyer and adapted tohave movement therein to permit the entrance of cool air into the drier, in the manner set forth.-

11. In adrier, the combination of an inclosed drying chamberprovided with a feed member and a discharge outlet, an inner cylinder communicating with a source of heat and lying in the' drying chamber, and means to provide communication between the drying chamber and the atmosphere through the inner cylinder, including a valvular device for controlling the admissionof air. p 1

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.--.

I WILLIAM E. PRINDLE. I Witnesses: i

J. NASH, v 'GRETHE HALVORSEN.

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