USRE16229E - By x j j - Google Patents

Description

Dec. 15, 1925- V Re. 15,229

, c. E. BLYTH MACHINE FOR THE PRODUCTION OF POWDERED FUEL 2 Sheets Shoot 1 Original Filed April 18, 1921 INV ENTOR clg zrles E.Blyth Dec. 15,1925 126,165,229 c. E. BLYTH MACHINEzFOR THE PRODUCTION OF POWDERED FUEL Original Filed April 1 1-921 2 Shasta-Sheet 2 WITNESSES INVENTO-R 01111 155 5.131;: W WWQL 11 w Reissued Dec. 15, 1925.

UNITED, STATES PATTENT' oFncs.

AcHmn'FoR THE PRODUCTION or POWDERED FUEL.

Original No. 1,446,151, dated February 20, 1923, Serial No. 462,270, filed April 18, 1921.

reissue filed December 9,

To all whom it may concern:

Be it known that I, CHARLES EDW'ARD BLYTH, a subject of'the King of Great Britain, residing-at Dunchurch, near Rugby, in

the county of Warwick, England, have invented new and; useful Improvements in Machines for the Productionfof Powdered Fuel, of'which the following is a specification. v This invention relates to a pulverizing machine and more particularly to a machine which has sets of interfitting, revolving and stationary impactbodies' on a rotor and the casing wall respectively arranged to pulverize thematerial fed thereto; 7 One object ofiny invention is to provide a simply constructed, eflicicnt and economically operatedmachin'e which is partic'ular 1y adapted for pulverizing fuel, as well as other materials, and which will pulverize the same to a desired-degree of fineness.

Another prime object is to provide asin gle and complete unit capable of crushing, drying and finely grinding the material fed thereto and delivering the same without the aid of accessory apparatus. "\Vith'these and other objects in view as willbe apparent'to one skilled in the art, my invention resides in the combination of parts set forth in the following specification and covered by theclaims appended hereto.

In accordance with my invention, I provide an apparatuswhich has two pulverizing zones, the first for preliminarily breaking the material and the second for grinding it finely. The 'pulverizing operation is obtained by means of a rotor and impact bodies revolved rapidly thereby which are so constructed and arranged that the material is broken by impact and attrition. The rotor is preferably constructed as a disk spaced peripherally and laterally from the casing walls to form two zones connected by an annular passage around the periphery of the disk. The impact bodies are preferably shaped as pegs and several interfitting 'sets of these pegs are mounted 'on the rotor and the opposed casing wall so that the rotor pegs may serve as impellersand the others as heaters to break the material therebetween. Theends of the pegs of one set, and preferably those on the rotor, may be separated from the support for the other set so as to provide free passages'and recirculating spaces for the material being treated.

Application tor 1924. Serial No. 754,864.

In the second zone, the outlet'is locatednear the rotor axis and the materialis forced by means of a fan to travel against the centrifugal action of the revolving pegs, so that the coarse material is constantly hurled towards the periphery of the rotor. As a safeguard to prevent the escape of coarse particles from the pulverizing chamber, provide a rejecting device, preferably comprising blades I'evoluble with the disk, which throws the coarse particles back into the paths of the. pegs and permits only a fine dust cloud to escape therethrough.

Referring to the drawings, I have there illustrated one embodiment combining all of the above mentioned features of my invention, and in whichi Figure 1 is a longitudinal sectional view of the apparatus. H

Figures 2 and 3 are sectional views showing opposite faces of the beater disk, Figure 3 being taken on the line 3-8 of Figure 1;

Figure 4 is a sectional view of the upper part of the machine showing more clearly the arrangement of the fan blades on the beater disk and of the contraflow deflectors at the' delivery orifice.

Figures '5 and 6 are each partial side views taken from opposite sides of the beater disk showing the fan blades and contraflow deflectors respectively in section.

a Figure 7 is-a perspective view on a larger scale of one or the fan blades or deflectors.

Referring to the drawing, the beater disk a of which there may be one only, as shown,

is rotatably mounted in a fixed casing Z2 through which the driving shaft 0 passes,

and is peripherally spaced from the casing to provide a passage for' the pulverized ma terial from one side of the disk to the other.

Each face of the said disk carries a series of outwardly projecting impellers or beaters d which pass between fixed heaters e on the inside walls of the casing. Between the free ends of the impellers d and the inside walls of the casing a space which, as shown, is more than suificient for clearance,,is left, to allow, for free circulation of the suspended material. This space serves as a passzige for the free circulation of the materia The intake side of the beater disk is provided at its periphery with an annular series of closely arranged. transversely curved fan blades f having flanged ends as seen in Fig- I to the disk a and attl ie other end toan annular plate 9. -The object'of these blades,

the arrangement-of which is'clearly shown in Figure 5, is to keep the material under treatment against the action of centrifugal force set up by the rotating disk a, Wltllllli the area swept by the heaters until. it has been reduced to such'fineness that, the effect of centrifugal force oneach particle. being negligible, it will pass with the air currentbetween the blades and be uniformly distributed thereby around the disk a into the second or delivery chamber at the other side of the said disk.

On the other or delivery side of the heater is a smaller ring of curved deflector blades" h which are arranged parallel with the axis of the machine and riveted by their flangedends to the disk a and to an extending flange on the main delivery or exhaust fan m, as

seen in Fig. 4. The blades have deflecting surfaces, as illustrated, which serve, as they. revolve, to reject and throw backall coarse particles into the path of the beater pegs. These blades h as will be seen from Figure 6 are arranged .close together so that only the finely divided particles. can float between the blades against the countercurrent set up by their fan like surfaces. This precludes the possibility of any coarse particles that may have found their way into the second or delivery chamber passing through the deli ery orifice and returns such particles back amongst the heaters until reduced to the requisite degree of fineness that they will ass with the air current between the lades h. v i l The fuel, previously reduced to about the size of one inch cubes, is fed continuously into one end of the machine from a hopper. i by means of a feed screw In whence it falls amongst and is rapidly reduced by the heaters.

to a fine powder. At or about the same end of the machine an opening Z is provided for the entrance of hot air the temperature and pressure of which may be varied. This opening may be suitably adjusted, as by means of a slide damper p in the air inlet pipe r. The heat of the waste gases from the furnace may be conveniently and economically utilized for heating the air.

A delivery fan m is provided at the other side of the machine and arranged within a casing n which is in direct communication with the delivery orifice 0 so that fuel pass-. ing between the blades It may enter thefan The fuel exit is nearthe axis of the disk so that the powdered material is forced to travel inwardly against the centrifugal force set up by the rotating disk.

It is important to note that the suspended fuel, preliminarily reduced and driedin the inlet compartment, is subject to further re- 'duction by impact, attrition or abrasion in the dense atmosphere formed during its centripetalpassage through the delivery com-- may be accomplished by providing one or more openings 8 in the side of the fancasing' and covering the same by an adjustable slide valve t. Air entering these openings 8 will pass through openings u in the fan sides "and into the "central zone thereof. If this terminal velocityofftlie material is reduced disk and surrounding the hub' ojlthe sam below the internal maximum velocity produced ,by the disk a, internal circulation is set up, the material delivered at the edge of,

the disk returning by way of the space pro and the adjacent walls of the casing toward .the low pressure zones at the center of the .disk whence it is again impelledtoward the edge of the disk. This takes place to 'a more or less extent at both sides of the disk so that by the time the material reaches the delivery orifice it is more finely divided than where the path of the material through the machine is comparatively direct, as happens when the terminal velocity of. the material equals or exceeds its maximum internal velocity. 5

The operation of the device, in so far as understood, is about as follows: The coarse -materialfed' into the first zone is struck repeatedlyby'the .rev iolving pegs and thrown againstzthestationarypegs as it is moved centrrfugally -towarids the periphery of ,the

ticles towards; the periphery of the disk, hence only that material will escape through the outlet which is so finely divided that the 1 ratio of its weight to its surface exposure 05 disk. -The material is thus distributed fairly evenlyfor passingthrough the annular will permit it to be carried by the inwardly moving stream of air against the ccntrifugal force resulting from the speed of revolution of the moving pegs.

By spacing one set of the pegs from the support for the other, I- provide recirculating spaces and free passages outside of the path of the revolving pegs. If these spaces are located adjacent the casing walls, as illustrated, they probably afford a more or less free passage from the entrance to the exit for such material as is finely ground when it enters the casing. In the first zone,

thisv space probably ermits the formation of eddycurrents ecirculating streams which cause the material to be subjected re peatedly to the action of the moving pegs.

In the second zone, fines may travel along the casing-wall without having to pass inwardly between the revolving pegs and "so may escape easily to the outlet. If they are not sufliciently fine in size, the revolving rejector blades hurl them back against the pegs. Only a dust cloud can escape, the size ofthe, particles depending on the air velocity, the construction and manner of impellers, fan blades secured 'to the inlet side of said disk adjacent its rim, and blades securedv to said'disk on :the opposite side thereof from said fan blades forming a conduit for the fines. v

2. pulverizing device comprising a stationary casing having'a feeding and a discharge opening onopposite sides, adisk rotatably mounted in said casing between said openings, impellers projecting from opposite sides of said disk with a space more than suflicient for clearance between .their free ends and the side walls of said casing, heaters secured on said side walls intermeshing with said disk impellers, a fan chamber communicating with said discharge 7 opemn andblades secured to the adjacent side 0 said disk and constructed and ar; ran ed to deflect coarse. particles from the disc arge opening. a e r 3. A pulverizing device comprising a sta tionary casing having a feeding and dis charge opening on opposite sides, adisk rotatably mounted in said casing between and coeaxially with said openings and having imgpllers projecting from its opposite sides wit a space more than suflicient for' clear,- ance between the free ends of said impellers and the inside walls of said casing, heaters projecting from the inside walls of said casin a fan chamber and means adjacent said ischarge opening for preventing coarse material passing therethrough into the fan chamber.

4. An apparatus for pulverizing material,

comprising a casing having opposed internal walls and inlet and outlet openings on opposite sides, a disk rotatably mounted between saidwalls and arranged to provide directly connected pulverizing zones on o posite sides thereof, means to pulverize the -1naterial in both zones including a set of beater pegs on the casing walls projecting inwardly towards one side of the disk, and a set of impeller pegs mountedon the disk and revoluble between the beater egs which are arranged to break the material by suc ,cessive impacts; one of the sets of pegs beingi spaced by a considerable distance from the support for the other set to provide a space for free 'circulation of ,the 'material, and means to introduce coarse materlal and air into the casing and totransport. the finely divided material therefrom. I

5. An apparatus for pulverizing material comprising a hollow casing having an inlet and a centrally located outlet on opposite sides, arotor mounted between, said inlet and outlet and spaced from the casing to form two grinding zones connected by an annular passage around the rotor, means to pulverize the material in both zones including sets of "interfitting pegson the outlet side of the rotor and the adjacent casing wall arranged to break the material by successive impacts, the pegs on the rotor being spaced by a considerable distance from the casing wall 'to form a passage for the material, and

means for introducing air and coarse mate rial into the casing and for transporting the finely divided material therefrom.

6. An apparatus for pulverizing material comprising a casing having an inlet and a centrally located. outlet, a rotor mounted therebetween and spaced from the casing to i provide two pulverlzing zones connected by an annular passage at'the periphery of the rotor, means for introducing coarse materialand air into the first zone, means for transporting the air laden with pulverized material from the outlet of the second zone, means to break the material in the first zone,

sets of beater pegs on the casing in the sec- 0nd zone which pro'ect inwardly towards the rotor and sets 0 impeller pegs on the rotor. in opposition to and revoluble he-' tween the beater pegs which are arranged to finely pulverize the material by successive impacts as it passes from the periphery of the rotortowards the outlet.

' 7. An apparatus for pulverizing material comprising a hollowcasing, having opposed side walls, a disk rotatably mounted between said walls and spaced laterally andperiphera-11y from the casing to provide a, pulverizing zone on each side of the disk connected' by.an annular passage for the material, a plurality of series-of interfitting im pact pe mounted on both sides of the disk an on.said walls, which are spaced and arranged so that they disk may rotate and cause the material to be beaten by suc'- cessive impacts, means for introducing coarse material centrally into the casing on one side ofthe disk, means for removing the pulverized material from the central zone of adjustable means permitting a variable flow of air through the casing.

8. A pulverizing apparatus comprising a casing having .an inlet and a centrally cated outlet,a rotor having a face opposed to the outlet, means to pulverize material fed to the apparatus including sets of interfitting alternately revoluble and stationary im act bodies on said rotor face and the casmg wall respectively which are arranged concentric with said outlet, means for transporting the finely divided material towards the outlet and'a rejector' device arranged to prevent the escape of coarse material through the outlet and'to return it to the impact bodies for further treatment.

9. An apparatus for pulverizing material comprising a casing having an inlet and a centrally located outlet, a disk rotatably mounte in and spaced peripherally from the casing to form two pulverizing zones connected by an annular passage around the disk, means for introducing coarse material and air intothe first zone, means for removing pulverized material and air from the central portion of the second zone, means to break the material in the first zone, two sets of interfitting impact pegs in the second zone mounted on the casing and the disk, respectively to pulverize the material by successive impacts and means to prevent the escape of coarse material from the second zone.

10; A pulverizing apparatus comprising a hollow casing having centrally located inlet and outlet openings in opposite walls, a rotor disk mounted in the casing with its axis adjacent said outlet andspa-eed laterally and peripherally from the Walls to form two grinding zones connected by an annular passage around the disk, means providing for the introduction of coarse material and air into the first grinding zone, re'voluble impact devices to break up the coarse material in the first zone, interfitting sets of alternately staionaryand moving impact pegs on the casing wall and the disk respectively in the second zone which'are arranged'to pulverize the broken material as it passes from the periphery of the disk and against the centrifugal action of the revolving pegs towards the outlet, and a revoluble rejector adjacent the outlet to return the coarse material to saidlpegs.

11. A pulverizing apparatus comprising a casing having an inlet and a centrally disposed outlet on opposite sides thereof, a

rotor mounted between said inlet and outlet and peripherally spaced from the casingt'o provide a passage therebetween. a set of stationary beater pegs mounted within the easing and projecting towards the rotor," a set of impeller pegs on each side of the rotor revoluble between the stationary pegs, means for introducing coarse material through said inlet on one side of the rotor,'l neans for withdrawing pulverized material front Said outlet on the other side of the rotor, and a rejector device rotatable with the rotor andlocated adjacent the outlet which permits pulverized material to pass, therethrough but prevents egress of coarse material.

12. An apparatus for" pulverizing, material comprising a casing, a rotor disk revolubly mounted in and spaced peripherally from the casing to provide a passage therebetween, fixed beater pegs mounted within the casing and projecting inwardly towards the disk, impeller pegs on the disk revoluble between the beater pegs, means for introducing coarse materialinto the casing on one side of the disk, means forming an exit for the pulverized material on the opposite side of the disk and adjacent the axis thereof, means to prevent egress of coarse material through the casing exit and means for causing-avariable quantity of air to travel through the casing and carry the pulverized material therefrom.

13..A pulverizing apparatus comprising a casing having an inlet for the coarse mate-' rial, and a centrally locatedoutlet for the pulverized material on opposite sides of the. casing, a. rotor disk mounted between 'said openings and spaced peripherally from the casing to provide a passage therebetween, attrition pegs on the casing walls opposite the rotor and on both sides of the rotor which interfi't revolubly, means to feed coarse material in to the casing, means for 'ingroducing air into the casing, means to ing the coarse material to the attrition zone.

14., An apparatus of the class described comprising walls defining a pulverizing casing and a fan, chamber having a centrally located communicating passage therebetween, a rotatable shaft coaxial'with said opening, a rotor disk on the shaft widely spaced laterally and peripherally from the casing to form first "and second pulverizing zones connected byan annular passage for saidgmaterial, a' fan on the shaft within the fan" chamber, impact devices revoiuble with said shaft in the first zone, opposed sets of impact bodies on the casing and rotor in the seeond zone" which are arranged to pulverize material therebetween, .means for feeding v coarse material into the first zone and means for introducing and regulating the passage of air through the apparatus, said parts being so constructed and arranged that the walls defining material passes peripherally around the disk and thence'against the centrifu a1 action of the rotor to the passage to the in chamber. 15. A pulverizing apparatus comprising a fan chamber and a casing of substantiall circular cross section, which have a centra 1y located opening therebetween, a rotatable shaft mounted in the walls and passing through said opening, adisk and a fan mounted on the shaft Within the casin and the fan chamber respectively, the perip cry of said disk being spaced from the casing on the the casing wall to provide an annular passage, impact bodies on thecasing and the disk to pulverize material therebetween, means for introducing coarse material into from the opening, and a rejector device rotatable with the shaft and located adjacent the opening to prevent coars'e material passing into the fan chamber.

Signed, this 14th day of November, 1924, at the city of Coventry, England.

- CHARLES E. BLYTH.

opposite side of the disk

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