US1655724A - Drier - Google Patents

Description

W. C. CARPENTER Jan. 10, 1928.

DRIER Filed Deo. 5, 1925 Patented Jan. 10, 1928.

WILLIAM C. CARPENTER, OF LOS ANGELES, CALIFORNIA.

DRIER.

Application led December 3, 1925. Serial No. 72,899.

My invention relates to improvements in driers of the particular type that are designed for the rapid and economical drying .of sawdust, shavings, and like comminuted vegetable matter or in fact any pulverized or granular products that require partial or complete drying'before being put to its particular use.

The principal object-s ofmy invention are to provide a drier that is relatively simple in construction and which may be economically operated for thoroughly drying large quantities of pulverized or comminuted material, to provide improved means for delivering the material to be dried into one end of the drier andeffecting the discharge of a material from the other end of said drier, to arovide an improved arrangement whereby heated air, gases, or the like are caused to travel iirst in one direction through the entire length of the drier chamber or drum, and thence in the opposite direction for the entire length of the drier, and further to generally improve upon and simplify the construction of the existing forms of rotary driers and particularly those used for drying wood shavings, sawdust, peat, straw, and other matter that is used in the manu facture ot' fuel briquets.

lilith the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts that will hereinafter' be more fully described and claimed and illustrated in the accompanying drawing, in which- 1 is a vertical section taken length` wise through the center of a drier of my improved construction.

Fig. 2 is an enlarged section taken on the line 2 2 of Fig. 1.

Fig. 8 is an enlarged cross section taken on the line 3--8 of Fig. 1.

Fig. 4 is an enlarged cross section taken on the line 4 4 0f Fig. 1. x

Referring by numerals to the accompanyu ing drawing which illustrates a practical embodiment yof my invention, l designates a drum or hollow cylinder preferably formed of suitable sheet metal and of any desired diameter and length. For all practical purposes this drum. may be from 4 to 8 or 10 feet in diameter and from 30 to 60 feet in length. The inlet end of this drum is closed by a head 11 and the opposite or outlet end of the drum is provided with a conical shell 12 and the latter being provided at its outer end with ka circular discharge opening 13. Carried by the end of the shell 12 and disposed around opening 13 is a ring 14 that is channel shape in cross section and which receives the inturn iange 15 that is formed on the upper portion of a dried material chute 16.

The inlet end of the drum 10 is positioned within the cylindrical portion of-a hot air furnace 17 and the drum, when set up for use, occupies a slightly inclined position relative to a horizontal plane so that its dischrge end is slightly lower than its inlet en Secured on the outer face of the drum and at points suitably spaced apart are circum ferential rails 18 that bear on grooved rollers 19, the latter being mounted in suitable bearings.

Secured on the drum, preferably at an intermediate point, is a circular rack 2O with which engages a gear wheel 21, the latter being carried by a driving shaft 22, and which latter, when rotated, imparts rotary motion to the drum through said gear wheel 21 and rack 20.

Formed in the center of head 11 is a circular aperture 23 through which passes the lower end of an inclined tube 24, the same extending outwardly and upwardly at an angle through the top of the furnace extension 17.

Extending lengthwise through this inclined tube is a centrally arranged partition 25 that divides the space within said tube into an upper air outlet duct 26 and a lower material inlet duct or chute 27. The upper end of the material inlet chute communicates with a hopper 28 that is located externally of the furnace member 17 and the upper end of air outlet duct 26 communicates directly with a stack 29.

Air leakage through the` joint between tube 24 and opening 23 is minimized by a suitable packing arrangement between head 11 and tube 24 and which arrangement Vpreferably comprises overlapping ring flanges 24a that are secured to said tube 24 and head 11. n 4

The` partition 25 is arranged sothat its lower or inner end occupiesa `position above the axis of the tube 24 while its upper end occupies a position below the axis of said tube 24 and thus the material inlet chute 27 gradually increasesv in cross sectional dimensiOIlS toward its lower end with the result that the iinitei'ial will readily pass through said chute without clogging.

Hinged to the lower end of the partition 5 is the ripper straight edge ot a semi-circular plate 30, the saine being tree to swing in both directions. lllhile the drier is in operation and material is passing through chute 2T, plate 230 will swing outward and upward as a result ot' the pressure of the material against its inner 'tace and its lower edge will drag over the material that is discharging into the drinn l0. Vis a result ot this arrangement, the air tha is dif'icharging 'trom the drum will pass through open outlet 26 rather than through the practically closed material inlet duct QT.

Secured to the inner :l i ot' conicalinein- `ber l2 are material disrharge chu 8l, preterably constructed ot suitable sheet metal that. are lient into spiral shape when viewed in elevation or eros.` sectioin and which chutes are designed to piel; up the dried material while at the bottoni or lower portion of their circular path ot trziiel and to permit the discharge bi: gravity ot said inaterial as said chiites'l par. liioiigh the upper portion ot their circular irayel and during which latter period said chiites occupy the inclined position as shown by the upper one ot said chutes in l.

Arranged within the drinn i() in'iniediately adjacent to the wall thereof and extending the entire length ot said drinn are tubular members 3:2 that are preferably formed oi suitable sheet metal and the toiward or inlet ends of said tubes are seated in head ll.

The 4ends ot the tubes 32 that terminate adjacent to conical member l2 are reduced in diameter and said reduced ends are rebent as designated by 33 and said re-bent ends project a short distance lengthwise to ward the inlet end ot the drier so as to torni short jet nozzles These tubes are for the purpose ot conducting heated air and gases lengthwise through the body ot the drier at a point adliacent to the wall ot drinn l0 and said heated air and gases discharge from the jet nozzles 34; and pass in the opposite direction or rearwardlyT through the central portion ot the drum and through outlet duct 26 to stack 29.

Tubes 32 are retained in position adjacent to the wall ot drum' l() by ring-shaped trames 35, the latter being secured to the wall ot drum l0 by bolts such as 3S and secured to each ring-trame 35 are the outer ends or radially disposed arms 39, theinner ends thereof occupying recesses that are formed in a centrally arranged ring-shaped bearing block 40.

Passing radially through each ring-shaped bearing block is a series ot set screws such as il the outer ends thereof bearing directly against the inner ends ot the corresponding ai'ins 5E). liihen the set screws el are tight-- cned against the inner ends ot the arms 89 the corresponding ring-shaped 'trame 37 will be forced outward with considerable pressure thereby clamping the tubes 52 against saddle blocks Ll-Q and which latter are disposed between each tube P2 and the wall ot' drinn l() (ree Fig.

Arranged between the tubes 3Q and eX- tcnding between the shell ot drinn lO and the rings 37 are radially disposed plates 43 that extend the entire length ot the drinn andthe inner edges ot these plat-es are bent n laterally to torni lips or lianges 44. These plates Vwith their tlanged inner edges tunetion as carriers to piek up the piilyerized inatei'ial from the bottoni ot the drum and carry the same upward to the top ot the drinn :trom which latter point the material 'will discharge from said carriers and pass harliwardly to the bottom portion ot the drum.

rl`he operation of my improved drier is as follows The driiiii rotated by the operation of power driven el 22 and the sawdust, shayings. or other material to bedried is delivered to the inlet end ot the drinn through chute 2T. A blower torces heated air and gases liioni the furnace into and through tube: 3Q thereby providing a heating zone entirely around 'the wall oit the drinn and the heated air and gases.` atter passing through the tubes dischai ge. Jfrom nozzles Bliand pass lengthwise through the central zone of the drinn and said air and gasei-f7 which practically cooled by the time they enter the upper portion ot tube 2t? pass oli through outlet duct .26 and stach 2f). l

its drinn l0 continues to rotate the ma terial to be dried will pass over the heated tubes and the material that is caught between said tubes and by the carrier., it?) will be carried upward to the top oit the drum, from which point said material will drop bail-lr to the lower portion ot the drum aud in so doing said material will. encounter the heated air that is passing through the central portion oi the d ann. i

Obviously the material th at is being dried fill absorb a considerable portion ot the heat trom the highly heated air and gases passing through tubes 32 so that the temperature of the air and gases discharging from the nozzles Set will be lowered to such a degree as to preclude any possibility ot ignition of the material that is passing through vthe drinn. i

As the drinn continues to rotate the inaterial will gradually pass to the discharge end ot said drum owing to the inclined p0- sition of the drum and as the spirally bent chutes 31 pass through the lower portion o't their circuiar path or' travel they will pickup the dried material and carry the same to the material inlet.

top of the path ofl travel and from which latter point said dried material will, by the inclination of the spirally bent chutes, discharge downwardly therethrough and pass into outlet chute 16.

Thus it will be seen that I have provided a drier that is relatively simple in construction, capable of being easily and cheaply produced and which is very effective in per-v forming its intended functions. An especially desirable feature of my improved drier is the arrangement of the heated air and gas conveying tubes around the wall of the drum and the re-bent ends of said tubes whereby the heated air and gases are caused to travel first in one direction and then in the opposite direction entirely through the drum, thus materially increasing the efficiency and capacity of the drier.

It will be understood that minor changes in the size, form and construction of the various parts of my improved. drier may be made and substituted for those herein shown and described without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

I claim as my invention:

l. In a drier, a rotary drum having a inaterial inlet at one end and a material outlet at the other end, a series of heated air ducts arranged on the interior of the drum and extending lengthwise adjacent to the wall thereof, andthe discharge ends of which air ducts terminate within thedrum adjacent to one end thereof and said discharge ends being rebent so as to discharge heated air lengthwise through the chamber in the drum between said series of air ducts.

2. In a drier, a rotary drum having a material inlet at one end and a Vmaterial outlet at the other end, a series of .heated air ducts arranged on the interior of the drum and extending lengthwise adjacent to the wall thereof and the discharge ends of which tubes are re-bent and projected toward the end of the drum that is provided with the 3. In a drier, a rotary drum, a series of heating tubes extending lengthwise therein and arranged adjacent to the wall of the drum, the discharge ends of which heating tubes are rebent within the drum to form nozzles that discharge heated air lengthwise through the chamber in the drum between saidV series of heating tubes, one end of said drum being provided with a material inlet and an air outlet and the opposite end of said drum being provided with a dried j material outlet opening and a series of material discharge chutes arranged on the inner face of the tapered end portion of said drum.

6. In a drier, a rotary drum, one end of which is tapered and provided with a dried material outlet opening and a series of material discharge chutes arranged on the inner face of the tapered end portion of said drum, each of which discharge chutes comprises a section of sheet metal bent into spiral form.

7. In a drier, a rotary drum, a series of heating tubes extending lengthwise on the interior of said drum adjacent to the wall thereof, the ends of which tubes at one end of the drum are open and communicate with the exterior of the drum and the yopposite ends of which tubes are re-bent so as to form short longitudinally disposed discharge nozzles.

`8. In a drier, a rotary drum, a series of heating ltubes extending lengthwise on the interior of said drum adjacent to the wall thereof, the ends of which tubes at one end of the drum are open and communicate with the exterior of the drum, the opposite ends of which tubes being re-bent so as to form short longitudinally disposed discharge noz- LZles, a material inlet chute leading into one end of said drum and an air outlet chute arranged adjacent to said material inlet chute.

In testimony whereof I aiiix my signature.

WILLIAM C. CARPENTER.

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