US2483630A

US2483630A - Rotary drier or cooler

Info

Publication number: US2483630A
Application number: US644754A
Authority: US
Inventors: John L Erisman
Original assignee: Link Belt Co
Current assignee: Link Belt Co
Priority date: 1946-02-01
Filing date: 1946-02-01
Publication date: 1949-10-04
Anticipated expiration: 1966-10-04

Description

Oct. 4, 1949. 4 J. L. ERlSMAN 2,433,630 &

ROTARY DRIER 0R COOLER Filed Feb. 1, 1946 3 Sheets-Sheet l INVEN TOR.

fizallhbmam Oct. 4, 1949. J. LLLLLLL AN 2,433,630 I I N VEN TOR. B fajlzzilhlrmaw Oct. 4, 1949. J. ERISMAN 2,483,630

ROTARY DRIER 0R COOLER Filed Feb. 1, 1946 s Sheets-Sheet s .V/l/l/ll/ INVEN TOR;

A from FY Patented Oct. 4, 1949 ROTARY DRIER OR COOLER John L. Erisman, Oak Park; 111., assignor to Link- Belt Company, a corporation of Illinois Application February 1, 1946, Serial No. 644,754

17 Claims.

This invention relates to rotary dryers or coolers and deals more particularly with improvements in the type of dryer or cooler disclosed and claimed in the patent to Gustav Bojner et al., No. 1,709,456, issued April 16, 1929.

The type of dryer or cooler covered by the above identified patent consists of a rotatable, horizontally arranged cell or cylinder through the central treatment chamber of which the material to be treated, while being handled as a bed, is caused to travel lengthwise and is gently agitated as a result of rotation of the cell or cylinder. This central treatment chamber is formed by an annular series of longitudinally extending, circumferentially spaced louvre sets on the inner circumference of the cell or cylinder. Each louvre set consists of one radially arranged outer louvre directly attached along one of its longitudinal edge portions to the inner surface of the cell or cylinder and one tangentially arranged inner louvre carried by the remaining longitudinal edge portion of its radial louvre. The radial or outer louvres are substantially in parallelism circumferentially of the cell or cylinder while the tangential or inner louvres are in overlapping relation with respect to each other and extendrearwardly with reference to the direction of rotation of the cell or cylinder. The louvre sets thus collectively form a circumferentially arranged series of longitudinal passages with each passage having one longitudinal outlet opening or slot that afiords communication between its passage and the said central treatment chamber. By delivering the hot or cold treatment fluid through an inlet manifold that registers successively with the adjacent ends of only those longitudinal passages that underlie the bed of material being treated as the cell or cylinder revolves, it will be seen that the treatment fluid will be caused to permeate radially inwardly through the material for drying or cooling the latter. The treatment fluid, after passing through the bed of material, is exhausted from one end of the cell or cylinder.

It is the primary object 01' this invention to materially improve the efficiency of dryers or coolers of the above mentioned type by employing a novel louvre construction or assembly that will bring about a more thorough treatment of the material moving through the cell or cylinder by allowing more treatment fluid, per given quantity of material in any cross section of the cell or cylinder, to pass at a lower velocity through the material while decreasing the resistance to the flow of the fluid ofiered by the bed of material holes in the bed and to carry off the finer particles of material withthe exhaust.

A further important object of the invention is to provide a novel louvre construction or assembly for dryers or coolers of the above mentioned type in which each set of louvres consists of one radial louvre and a plurality of tangential louvres, whereby a plurality of oulet openings or slots are provided for each longitudinal fluid passage through which the treatment fluid will flow into the bed of material at a reduced velocity.

Another important object of the invention is the provision of a novel louvre construction or assembly of the type mentioned above in which the radial louvres and the tangential louvres are separately tied together and braced circumferentially of the cell or cylinder to increase their rigidity, and in which the tangential louvres are supported in such a manner as to permit relative linear expansion or elongation, between the tangential louvres and the radial louvres, thereby eliminating any tendency for the tangential louvres to buckle. It will be appreciated that if the tangential louvres buckle when they expand or elongate, the openings formed between adjacent louvres will be uneven and abnormal amounts of treatment'fiuid will pass into the material bed at the points where the louvre spacing is greatest.

Other objects and advantages of the inven- 30 tion will be apparent during the course of the and reducing the tendency for the fluid to blow 55 following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout thesame,

Figure 1 is an end elevational view of the feed end of a rotary dryer or cooler embodying this invention,

Figure 2 is an enlarged end elevational view of the feed end of the improved dryer or cooler with the stationary end plate structure removed,

Figure 3 is a longitudinal sectional view of the dryer or cooler illustrated in Figs. 1 and 2,

Figure 4 is an enlarged, detail view showing a fragment of the novel louvre construction or assembly in transverse section,

Figure 5 is a fragmentary sectional view taken on line 5-5 of Fig. 4, I

Figure 6 is a fragmentary sectional view taken on line 6-6 of Fig. 4,

Figure '7 is a fragmentary sectional view taken on line 'I 'l of Fig. 4, and g Figure 8 is a fragmentary sectional view taken on line 88 of Fig. 4. v

In the drawings, wherein for the pu pose of illustration is shown the preferred embodiment of this invention, and first particularly referring to Figs. 1 and 3, the reference numeral l designates the outer cell or cylinder of a horizontally arranged, rotatable dryer or cooler. This cell or cylinder is provided with a suitable number of supporting peripheral rings or tracks II that ride on the rollers l2 suitably journaled in the supporting frame or base l3.

At the feed end of the dryer or cooler cell or cylinder [0, a stationary distributor head or ring I 4 is positioned and is supported by the framemembers l5, see Fig. 1. At this feed end, the cell or cylinder 16 is provided with a feed plate [6 having a central opening throughjwhich the material to be treated is delivered to the central treatment chamber of the dryer qr cooler. The

distributor head or ring M is formed with a through the bed of material beingtreated in the central chamber of the dryer or cooler.

The patent to Charles A. Schneider, No. 2,253,098, issued August 19, 194i, discloses in considerably greater detail the construction of the stationary distributor head or ring I 4. Consequently, reference may be made to this patent for a better disclosure of this element.

The dryer or cooler cell or cylinder I0 is intended to have formed therein an annular series of longitudinal passages adjacent its inner circumference. These passages 20 are illustrated in Figs. 2, 3 and 4 as being formed by the longitudinally extending, radial louvre plates 2| that are secured along their outer longitudinal edges to the inner surface of the cell or cylinder [0 in any suitable manner, such as by continuous or tack welding, as at 22, or by being flanged and bolted or riveted to the cell or cylinder. By inspecting Fig. 3, it will be seen that the radial louvres 2| are gradually reduced in depth lengthwise of the cell or cylinder [0 with the result that the space defined collectively by the inner, free longitudinal edges of these louvres gradually increases in diameter from the feed end to the discharge end of the cell or cylinder.

Figs. 2, 3, 4 and 7 disclose. the inneryfree edge portions of the radiallouvres 2| asbeing cut away or notched at desired longitudinally spaced intervals. These notches 23 for the several radial louvres 2| are arranged in circumferentially aligned sets and function to receive the continuous, annular bars 24. These bars are disclosed in Figs. 4 and 7 as being welded to the adjacent portions of the radial louvres 2|, as at 25.

It will be appreciated that these longitudinally spaced, continuous annular bars 24 perform the function of tying together and bracing the inner edge portions of all of the radial louvres'2'l. It, further, will be noted that instead of seating the annular bars 24in thenotches 23, formed in the free edge portions of the radial louvres 2|, the annular members 24 "could be seated'dir'ebtly' on the edges of these louvrs so as to lie entirely radially inwardly of the latter. The fre e lon'gitudinal edges of the radial lbu'vres 2| may be left straight, as illustrated in Figs. 2 or 4, or they may be flanged for increased stiffness, depending upon the type of service required of the dryer or cooler.

Figs. 2, 4 and 6 illustrate the continuous annular bars 24 as having welded to the inner surfaces thereof a desired number of transversely arranged filler bars 26 which are uniformly spaced circumferentially thereof. Each one of these filler bars supports in spaced relation to the inner surface of the continuous annular bar 24 a hold down bar 2'! which projects circumferentially beyond its associated filler bar in a direction that is rearwardly of the direction of rotation of the cell or cylinder I6, as indicated by the direction arrow 28a of Fig. 4. These filler bars 26 and hold down bars 21 cooperate with each other to form a circumferential series of clips.

' Figs. 2, 3 and 4 disclose an annular series of longitudinally extending, tangentially arranged inner louvres 28 which are positioned inwardly of the radial louvres 21. These tangential louvres overlap each other rearwardly. with reference to the direction of rotation of the cell or cylinder Ill 7 Each tangential louvre member 28 is formed witha bent inner flange 29 that is arranged to extend substantially radially of the cell or cylinder if]. The longitudinal edge portions 30 of the tangential louvres are bent at an obtuse angle with respect to the main body portions of these louvres. These bent edge portions are provided with circumferentia'lly aligned notches 3|. Preferably, these ciroumferentially aligned notches for'th'e several tangential louvres 28 are arranged in radial alignment with the continuous, annular bars 24 that arecarr'ied by the radial louvres 2|. Each circumferentially aligned series of tangential louvre notches 3| is intended to have positioned therein a continuous, annular rod 32. These rods are fastened or anchored to the tangential lou'vres by triangularly shaped filler pieces33 "which are welded at 34, see Fig. 5, to both the annular ring 32 and the tangential louvres 28. These longitudinally spaced rings 32 function to tie together and brace the several tangential louvres "28.

By inspecting Figs, 4, '7 and 8, it will be seen that the outer flanged longitudinal edge portions 29 of the tangential louvres 28 have suitably welded thereto the saddle bars or shoes 35. These saddle bars or shoes are positioned so as to registe'r with the continuous, annular bars 24 which are attached to the radial louvres 25. Triangular filler pieces 3fi are welded at 31, see Figs. 7 and 8, to the adjacent surfaces of both the tangential louvres 28 and the saddle 'bars or shoes 35. By particularly inspecting Fig. 4, it will be seen that these saddle bars or shoes 35 function to support the tangential louvres 28 on the'continuous annular bars '24, and that the clips, that are formed by the filler bars 26 and hold down bars 2?, function to fas'ten the sad'dle bars or shoes 35 to the continuous annular bars 24. To accomplish 'thisanc'ho'rage, the saddle bars or shoes 35 project-into the spaces formed by the overhanging portions of the hold down bars 2?.

The saddle bars or shoes35 are not welded, or otherwise'fasteiied, to either the hold down bars 2'! of the clipsor to the continuous, annular bars 24. Cdns'efiuiitlmjthe saddle bars or shoes 35 can shift or slidelong'itudinally "of the 'cell or cylinder If) and relative to the "annular bars 24 and their clip's 2fi 2l. Thisfelativemovement is provided to nnwrnetammun i1ou res 28 to partake of linear ex non, orf el'ongation, relative to the radial "'l'oi'ivres 21-. Thiseirp'ansio'n or elongation is desirable to prevent buckling of the tangential louvres.

By inspecting Figs. 2 and 4, it will be seen that two tangential louvres 28 are provided for each one of the longitudinal fluid passages 20. The tangential louvres, therefore, form two outlet openings or slots for each longitudinal fluid passage through which the treatment fluid delivered to the passages will be permitted to flow into the central treatment chamber that is collectively defined by the annular series of tangential louvres 28. Although only two tangential louvres 23 are illustrated as being provided for each longitudinal fluid passage 20, it will be understood that for the larger diametered cells or cylinders is additional tangential louvres 28 may be provided for each longitudinal fluid passage 20. In other words, the smaller internal diameter of the feed end of the louvre assembly determines the number of tangential louvres 28 that can be provided for each longitudinal fluid passage 20.

When the dryer or cooler cell or cylinder is rotating in the direction of the arrow line 28a of Fig. 2, the bed of material being treated will be positioned as indicated by the dash line 38 in this figure. This bed of material will be supported by the tangential louvres 28 that underlie the same. The outer edge flanges 29 of these louvres will function to prevent any of the material of the bed from flowing into the fluid passages 29. Any material that is trapped or held by these outer edge flanges 29, of tangential louvres located in the region of the bottom dead center of the dryer or cooler, will be spilled back into the central treatment chamber as these louvres pass upwardly around the angularly path traveled by the tangential louvres. The spaces or gaps that are left between the outer edges of the flanges 29 and the opposed surfaces of adjacent tangential louvres 28 determine the amount of treatment fluid that can pass from the fluid passages 20 through the outlet openings or slots that are formed between adjacent tangential louvres. After passing through these flow defining gaps, the treatment fluid will be permitted to expand slightly before it is discharged into the central treatment chamber where it will be caused to permeate radially through the bed of material 38. This expansion of the treatment fluid will reduce its velocity of flow and thereby reducing any tendency for the treatment fluid to blow holes in the bed of material. The provision of a plurality of outlet openings or slots for each fluid passage 20 makes it possible to flow more treatment fluid, at a lower velocity, through the bed of material, per given quantity of material in any cross section of the cell or cylinder.

It will be appreciated, by considering Figs. 1 and 2, that the treatment fluid feeding manifold l'i operates to eiiect delivery of the hot or cold fluid only to the passages 26 which overlie the bed of material 38 as the cell or cylinder H3 rotates.

It is believed the importance of and the a tages flowing from the improvements embodied in the dryer or cooler of this invention best will be understood by comparing the same with the structure of the aforesaid Gustav Bojner et al. patent as it has been commercially exploited.

As has been explained above, the prior patented commercial structure includes a multiplicity of radial outer louvres which extend longitudinally of the cell or cylinder to form an annular series of longitudinal passages. The treatment fluid is delivered by a suitable inlet or feed manifold to one end of each one of these passages as they successively move into position beneath the bed of material being treated.

This fluid is delivered to the bed of material by flowing between the tangential louvres that are carried by the free longitudinal edges of the radial louvres. Because each radial louvre carries only one tangential louvre, each longitudinal fluid passage is provided with only one longitudinal outlet opening or slot through which the treatment fluid can be delivered to the bed of material.

It should be obvious that the rate at which material can be dried or cooled in the central treatment chamber of the type of device being considered is dependent on the amount or Volume of the treatment fluid that can be delivered to the bed of material during any given unit of time. Also, that the characteristics of the material being treated determine the velocity at which the fluid can be delivered to the bed of material. For example, if the treatment fluid is delivered to a bed of fine or fluffy material at the velocity that is proper for coarse or heavy material, holes will be blown in the bed of flne material and a substantial amount of the material will be blown out of the dryer or cooler with the exhausted fluid. Consequently, a standard width or thickness has been established for the longitudinal outlet openings or slots and the rate of feed of the treatment fluid through said openings or slots is varied for different types of materials. This variation in the rate or velocity of feed of the treatment fluid best can be illustrated by pointing out that ten thousand cubic feet per minute has been determined to be a suitable rate for treating heavy or coarse materials but the rate must be reduced to a velocity of from four thousand to six thousand cubic feet per minute for treating flne or fluffy materials. It is obvious, therefore, that the louvre arrangement of the Bojner et al. pattent type of dryer or cooler provides a substantially lower capacity for treating fine or fluffy materials than it does for treating coarse or heavy materials.

With the improved form of louvre arrangement embodying this invention, each longitudinal fluid passage is provided with at least two outlet openings or slots through which the treatment fluid is delivered to the bed of material. Therefore, by maintaining the same standard width or thickness for the two or more outlet openings or slots for each longitudinal fluid passage in this improved louvre arrangement, as has been established for the single outlet opening or slot of the Bojner et a1. patent louvre arrangement, the same volume of fluid can be delivered to the bed of material at onehalf the former velocity, or twice the volume of fluid can be delivered at the former velocity. With a bed of the same material in the same volume of fluid and circulated through both the prior and the improved forms of dryers or coolers, it has been determined that the static pressure in the fluid inlet or feed manifold of the prior structure measures flve and one-half inches of water while with the improved structure the static pressure measures only one and one-half inches. According to fan law, the volume of air or gas flowing through a system varies in proportion to the square of the static pressure in the system. Applying this fan law to the system provided by the improved form of louvre arrangement, with two outlet openings or slots for each longitudinal fluid passage, the static egss cso pressure -'should have measured -three and :eighttenths inches instead of the one and one-half inches stated above. The improved form of louvre arrangement was further checked by circulating twice the volume of fluid through the sameimaterial'bed, so thatthevelocitywould be the .same through each one of the two outlet openings or slots, for each'longitudinal fluid passage -as through the single outlet-opening or slot of the patented.louvrecarrangement. This check showed an increase in the ,staticpressure .to only two and one-quarter inches. These improved operating conditions have resulted in greatlyincreasing the capacity of this general type of dryer or cooler for treating fine or fluify ,materials and makes possible the use of smaller fans .and motors for circulating the treatment fluid.

Another important improvement has been noted in comparing the operations of the prior and the improved dryers or-coolers. Fine materials have had a tendency :to work out through the treatment fluid inlet or feed :manifold with the :prior patented structure but no such tendency is evidenced with the improved structure. This difierence in operation :is believed to be dueto theifact thatless fluid turbulence occurs in the spaces between the tangential louvres-with the improved structure. Turbulence in these spaces apparently allows fine material to 'move through these spaces countercurrent to the direction of flow of the treatment fluid.

Having thus described the invention, I claim:

1. A device of the type described, comprising a rotatably supported, horizontally arranged cell orcylinder, an'annular series of longitudinally extending substantially radial outer louvres secured at their outer longitudinal edge portions to the inner surface of the cell-or-cylinder in circumferentially spaced relation to form a circular series of longitudinal treatment fluid passages, means for tying together andbracing the inner longitudinal edge portions of said radial louvres, an annular series of longitudinally extending, overlapping, tangential louvres arranged inwardly-of saidouter louvres-and forming a plurality of longitudinal outlet-openings or "slots for each of said fluid passages, and means for'suppor-ting'the annular series'of tangential louvres 'on the tying andcbracing means for the radial louvres so as :to permit linear expansion of the tangential louvres'relative to'the radial :louvres.

.A deviceof theitypetdescribe'd, comprising a rotatably supported, i'horizontally arranged cell or cylinder, an annular series .of longitudinally extending substantially ;radi'al :outer :louvers secured at their :outer longitudinal edgeportions fto the inner :surface .of*the cell or cylinder in :circumferentially'spacedrelation toform a circular series "of :longitudinal treatment fluid passages, means iortying together and bracing the inner longitudinal edge portions of :said radial Flouvres, an annular series of longitudinally extending, overlapping, tangential EIOII-VIGS :arranged inwardlylof said :outer louvres and forming -a plurality-iof ilongitudinal loutlet openings or slots 1 or each of said fluid passages, .means -'for supporting the annular :series of itan'gential louvres on the tying and :bracing 'means Ifor RlZhB Itdldl Ilouvres so;as toipermitalinear expansionnfmhe'itangential louvres relative dzonthe :radial louv-res, and :means 8 for tying together and bracing the inner edge portions of said tangential louvres.

3. A device 0f the type described, "comprising aurotatablysupported, horizontally arranged cell or cylinder, ;means forming an :annular series of longitudinal, tinwardly opening treatment fluid passages atithe inner circumference of the'cell or cylinder, a plurality of annular members supported on the'fluidpassage forming means spaced longitudinally mi and arranged concentrically with the cell-or:cylinder, a plurality of clips secured fto each-annular member in-circum'ferentially spaced relation, and an annular series of circumferentially spaced, overlapping, tangential louvres supported on'said annular members and 'fastened'thereto bysaid clips.

'4. A-device of the type described, comprising a'rotatably supported, horizontally arranged cell or cylinder,:means formingan annular series of longitudinal, inwardly opening treatment 'fluid passages-at Ltheinner circumference of the cell orcylinder, a plurality of annularmembers supported on the fluid passage forming means spaced longitudinally of and arranged concentrically with the cell or cylinder, a pluralityof clips secured to each' annular *meniber in circumferentially spaced relation, an annular series of circumferentially spaced, overlapping, tangential louvres, and means for supporting said louvres on saidannular members and cooperating with said clips to secure'the louvres in place.

5. Adevice o'f the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, means -forming an annular series of'longitudinal, inwardlyopening treatment fluid passages at'the 'innenc'ircumference of the cell or cylinder, 'a plurality of annular members supported on'the fluid passage forming means spaced longitudinally of and arranged concentrically with the cell or cylinder, a plurality of clips secured toeach annular-member in circumferentially spaced relation, an annular series of circumferentially spaced, overlapping tangential louvres, means for-supporting said louvres on'said annular members and cooperating with said clips to secure the louvres in place,-and a "plurality of longitudinally spaced, annular-members for tying together an'dbracing said louvres.

6. A device o'i the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, meansforming anannu'lar series of longitudinal, inwardly opening treatment -fluid passages atthe inner' circumference of. the cell or cylinder, 'a plurality of annular members supported on the'fiuid'passage'forming means spaced longitudinally of and arranged concentrically with the cell or cylinder, 'a pluralityof clips secured to *each annular member in circumferentially spaced relation, an annular series-of circumferentially spaced, overlapping, tangential louvres, and a plurality of spaced saddle bars fastened in longitudinal-alignment to each tangential ilouvre for supporting said lou-vres on said annular membersand for cooperating with said clips tosecure the louvres in place.

.7. FA device-of'thetype described,:comprising a rotatablysupported, horizontally arranged cell or cylinder, :means forming-an-annular series of longitudinal, inwardly opening treatment fluid passages ,at -theinnercircumference of the cell or=cylinder, a pluralityof "annular members supported 'on the fluid passage forming means spaced longitudinally -of and :arranged concentrically with the cell 'or -cylinder, a plurality of clips secured to each annular -*member in =circumferentially'spac'ed relation, an annular series of 'circumferentiallyspaced, overlapping, tangential louvres, a plurality of spaced saddle bar's fastened in longitudinal alignment to each tangential louvre for supporting said louvres on said annular members and for cooperating with said clips to secure the louvres in place, and a pill rality of longitudinally spaced, annular members for tying together and bracing saidlouvresjf 8. A device of the type described, comprising a, rotatably supported, horizontally arranged cell or cylinder, means forming an annular series of longitudinal, inwardly opening treatment fluid passages at the inner circumference offth'e' cell or cylinder, a plurality of annular members supported on the fluid passage forming means spaced longitudinally of and arranged concentrically with the cell or cylinder, an annular series of'circumferentially spaced, overlapped, tangential louvres, and means for supporting said series of louvres on said annular members to permit free linear expansion of said louvres.

9. A device of the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, meansforming an annular series of longitudinal, inwardly openingv treatment fluid passages at the inner circumference of the cell or cylinder, a plurality of annular members supported on the fluid passage forming means spaced longitudinally of and arranged concentrically with the cell or cylinder, an annular series of circumferentially spaced, overlapped, tangential louvres, means for supporting said series of louvres n said-annularmembersto permit free linear expansion of said louvres, and means'for tying together and bracing said series of louvres.

10. A device of the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, an annular series of longitudinally extending substantially radial louvres secured at their outer longitudinal edge portions to the cell or cylinder in circumferentially spaced relation to form a circular series of longitudinal treatment fluid passages which are open throughout their inner sides, an annular series of longitudinally extending, overlapping, tangential louvres arranged inwardly of the open sides of said passages and forming a plurality of longitudinally arranged, tangentially directed treatment fluid discharge openings or slots for each one of said passages, and means for supporting the tangential louvres on the annular series of radial louvres.

11. A device of the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, an annular series of longitudinally extending substantially radial louvres secured at their outer longitudinal edge portions to the cell or cylinder in circumferentially spaced relation to form a circular series of longitudinal treatment fluid passages which are open throughout their inner sides, means for tyin together and bracing the inner longitudinal edge portions of said radial louvres, an annular series of longitudinally extending, overlapping, tangential louvres arranged inwardly of the open sides of said passages and forming a plurality of longitudinally arranged, tangentially directed treatment fluid discharge openings or slots for each one of said passages, and means including said tying and bracing means for supporting the tangential louvres on the inner edge portions of said radial louvres.

12. A device of the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, an annular series of longitudinally extending substantially radial louvres secured at their outer longitudinal edge portions to the cell orcylinder in circumferentially spaced relation to form a'circular series of longitudinal treatment fluid passages which are open throughout their inner sides, and an annular series of longitudinally extending, overlapping, tangential louvres arranged inwardly of the open sides of said passages, certain ones of the tangential louvres being positioned with their outer longitudinal edges registeringwith the inner longitudinal edges of the radial louvres so as to function as extensions thereof, means for supporting the last mentioned tangential louvres on the radial louvres, the remaining tangential louvres being positioned with their outer longitudinal edges registering with the openinner sides of said passages, and means for supporting said remaining tangential louvres on the radial louvres, whereby all of said tangential louvres cooperate toform a plurality of longitudinally arranged tangentially directed treatment fluid discharge openings .or slots for each of said passages.

13. A device of the type described, comprising a-rotatably supported, horizontally arranged cell or cylinder, an annular series of longitudinally extending substantially radial louvres secured at their outer longitudinal edge portions to the cell or cylinder in circumferentially spaced relation to form a circular series of longitudinal treatment fluid passages. which are open throughout their inner sides, an annular series of longitudinally extending, overlapping, tangential louvres arranged inwardly of the open sides of said passage, certain ones of the tangential louvres bein positioned with their outer longitudinal edges registering with the inner longitudinal edges of theradial louvres so as to function as extensions thereof, the remaining tangential louvres being positioned, ,with their outer longitudinal edges registering withthe open inner sides of said passages, whereby all of said tangential louvres cooperate to form a plurality of longitudinally arranged tangentially directed treatment fiuid discharge openings or slots for each one of saidpassages, and means for supporting all of the tangential louvres on the annular series of radial louvres.

14. A device of the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, an annular series of longitudinally extending substantially radial louvres secured at their outer longitudinal edge portions to the cell or cylinder in circumferentially spaced relation to form a circular series of longitudinal treatment fluid passages which are open throughout their inner sides, an annular series of longitudinally extending, overlapping, tangential louvres arranged inwardly of the open sides of said passages and forming a plurality of longitudinally arranged, tangentially directed treatment fluid discharge openings or slots for each one of said passages, means for bracing the inner longitudinal edge portions of the radial louvres, and means for supporting the tangential louvres on said radial louvres so as to permit linear expansion of the tangential louvres relative to the radial louvres.

15. A device of the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, an annular series of longitudinally extending substantially radial louvres secured at their outer longitudinal edge portions to the cell or cylinder in circumferentially spaced relation to form a circular series of longitudinal treatment fluid passages which are open throughout "their inner sides, means "for tying together and bracing the inner longitudinal "edge portions of said radial louvres, an annular series of longitudinally extending, overlapping, tangential louvres arranged inwardly of the open sides of said passages, certain ones of the tangential louvres being positioned with their outer longitudinal edges registering with the inner longitudinal edges of the radial louvres so to function as extensions thereof, the remaining tangential louvres being ,positioned with their outer longitudinal edges registering with :the open inner sides of saidipassages, whereby all :of said tangential louvres cooperate to form a plurality of longitudinally arranged, tangentially directed treatment .fluid discharge openings 'nr slots for each one :of said passages, and means for supporting the annular .--series of tangential louvres on the tying and bracing means @for the radial louvres -so as to permit linear expansion of the tangential louvres relative the radial l-lonvres and .for supporting the tangentialdouvres on saidsra'diallouvres.

16. .A "device of the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, :an :annular series of longitudinally extending substantially radial louvres secured .at their outer longitudinal edge portions to the cell or cylinder in circumferentially spaced relation to form a circular series of longitudinal treatment fluid passages which 'are open throughout their inner sides, means for tying together and bracing 'the inner longitudinal edge portions of said radial louvres, an annular series of longitudinally extending, overlapping, "tangential louvres arranged inwardly of the open sides of said passages and forming a plurality of longitudinally arranged, tangentially directed treatment fluid discharge openings or slots 'for each one of said passages, and means including said tying and bra'cingmeans for supporting the 12 tangential louvres on the inner edge portions of the radial louvres and for allowing the tangential louvres fto expand and contract longitudinally relative'to-the radial louvres.

117. .A device of the type described, comprising a rotatably supported, horizontally arranged cell or cylinder, means forming \an annular series of longitudinally extending, radially inwardly opening treatment fluid passages at the inner circumference of the cell or cylinder, means for tying ltogether and bracing the fluid passage forming means .at locations that are longitudinal-ly spaced with respect to and are arranged concentrically with the cell .or cylinder, and louvre means supported onsaid tying and brac ing means .for :longitudinal expansion and contraction relative thereto, said louvre means forming a plurality of longitudinally arranged, tangentially directed treatment fluid discharge openings "(01' :slots for and coextensive with each one of thefluid :passages.

JOHN :L. ERTSMAN.

,REFERENCES CITED The following references are of record in the file of patent:

UNITED STATES PATENTS Number Name Date 1,282,960 .Sedelbauer Oct. 29, 1918 1,471,517 .Newberry Dec. 11, 1923 1,500,974 Webster July 8,1924 1,709,456 Bo'jner Apr. 16, 1929 1,929,953 Lindhard Oct. 10,1933 1,930,952 .Green Oct. 17,1933 2,020,960 Behrson 'et al. Nov. 12, 1935 2,119,916 Huse June "7, 1938 2,268,296 .Narsted et :a1. Dec. '30, 1941 OTHER REFERENCES The link-Belt Rota-louvre Dryer, Book No. 1911M the Link-Belt Co.

Certificate of Correction Patent N 0. 2,483,630 Qetober 4, 1949 JOHN L. ERISMAN t It is hereby certified that error appears in the printed sjieiiifihatitiri 6f the above numhered patent requiring correction as follows:

Column ll, lines, 23 and 24, strike out the words and for-"suppertihg the tangential louvre's on said radial mums";

and that the said Letters Patehtshouldbe reed with' this eerreetiontherein that: the same may conform to the recordof the case in thelFaterit, Otfice. 5 r. Signed endsealed this 7th day of February, AD. 1950.

THOMAS F. MURPHY,

Assistant Gammz'ssz'oner of Patents.