US1748050A

US1748050A - Pulverizer

Info

Publication number: US1748050A
Application number: US148815A
Authority: US
Inventors: Harrington Norma; Lawrence T Harrington
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-11-17
Filing date: 1926-11-17
Publication date: 1930-02-18
Anticipated expiration: 1947-02-18

Description

Feb. 18, 1930.v G. D. HARRINGTON 1,748,050

ULVERIzER vFiled NOV. 17, 1926 5 Sheets-Sheet 1 INVE'NTOR George Harn/@fon )YLWMYW ATTO N EYS G. D. HARRINGTON 1,748,050

PULVERIZER Filed Nov.\-l7, 1926 5 Sheets-Sheet 2 Feb. 18, 1 930.

Feb. 18, 1930. K G. D. HARRINGTON y 1,748,050-

PULVERI ZER Filed Nov. 17. 1926 5 Sheets-Sheet 3.

Feb. 1s, 1930.

4G. D. HARRINGTON PULVERIZER Filed Nov, 17. 1926 5 Sheets-Sheet 4 1 L 5 w.\\\\\\\\ no m m w TJ( Q o w n IH@ A ,H d w y m @mi Ax K ww Feb. 18', 1930.

G. D. HARRINGTON PULVERIZER `Filed NOV. 17. 1926' 5 Sheets-Sheet 5 ATTORN 5 Patented Feb. 18, 1930 'UNITED STATES PATE NT OFFICE GEoEGE n. HAjsEINGroN, or sEAGIEr, NEW JERSEY; NoEMA HAERINGroN AND LAW- RENCE T. HARRINGTQN HEIRS CEASED AT LAW OF SAID GEORGE D. yHARRING'ION, DE-

` .Application led November l?, 1926. Serial No. 148,815.

This invention relates to pulverizers.

- Pulveriz'ers of various types have been used v for many years for breaking up hard materials Such as ore, cement, limestone,c1ink ers, chemicals and so forth. Such pulveriz-A ers, however, havebeen heavy and cumber some in construction and expensive to manufacture. 5 Y

At the present time when the price of coal of the larger 'grades is prohibitive, the use of pulverized or powdered coal is coming to 'the fore as a satisfactory solution and as a vvide in a pulverizer,

method of overcoming the high vcost of producing heat for residences and manufacturing plants. By utilizing pulverizers to reduce the coal tothe desired neness, very l'ow grades of coalfcan be used such as rice, buckwheat, mine run and washer waste.

This inventionrelates particularly to centrifugal pulverizers and the invention has for its salientobject to provide a device of this type so constructed that it can be operated at very high speeds, thus causing the material acted upon to be thrown out at a very high velocity and be thus broken up. Another object of theinvention is to provide a pulverizer that can be economically manufactured and can" be used in factories -or houses to break up cheap grades of coal.

Another object of the invention is to pro vide a device so constructed that the parts thereof will be durable and will not be easily worn' away by contact with the material operated upon.' Y v .Another object of the invention is to-promeans for controlling' the size or gradeof the product discharged from lthe machine; g v

Further objects of the invention will 'appear from the following specification taken in connection with the drawings,lw hich'form apart of this application, y and in which Fig. 1 isv an elevational view of a4devic`e constructed in accordance with. the invention and illustrated in connection with avfurnace;

Fig. 2 is an elevational view taken' at right' angles to Fig. l,l this view being 'partlyA broken away; 1

.Fig. 3 Iis an enlarged 'sectional elevation z ing can be' used to feedmthe material directly charge conduit from the fan chamber.

showing the details of construction of the pulverizer; s

Figs.A 4 and 5 are sectional elevations taken su'lstantially on lines 4 4 and 5 5 of Fig. 3; an

Fig. 6 is an enlarged'sectional elevation taken substantially on line 6 6 of Fig. 5. Theinvention briefly described consists of a pulverizer comprising a disk uponwhich the material' to be broken up is fed, the disk having vaneslthereon adapted when the disk is rotated to throw the material at a high velocity against a serrated or corrugated ring which surrrounds the outer periphery of the disk. A. fan casing is mounted adjacent the disk and in the form of the invention illustrated, Vabove the disk and has an inlet opening disposed 'above the central portion of the disk through which the powdered material is sucked by the fan which operates'in the fan casing. v This powdered material is discharged fromthe fan casing at the periphery 'thereof arnd as shown in Figs'. l and 2, the

discharge pipeor conduit from-the fan casto a furnace. The upper surface of the disk and the outer surfaces of the vanes areccovered with relatively soft, non-metallic material, such as rubber, and this is also true ofthe arms and blades of the fan. This form of construction materially increases the lengthfof life ofthe parts covered'and also causes the device to operate more quietly.

Means is provided for regulating lthe suction of the fan and 'this is accomplished by adjustable air inlets 'in thel fan casing and bel'twee'nuthe fancas'iiig and the disk, by regulating the size of the opening' into the' fan casing vfrom the pulverizing chamber, by an adjustable opening, for the hopper chamber and by an adjustable gate valve inthe d]i3s properly@l regulating all of these openings,

l thesuction can be so controlled as to deterl'mine the grade of thepulverized material suckedinto the fan casing izing chamber.'

` vVarious novel features are incorporated in the pulverizing apparatus, suction' chamfrom the. pulverber and .anand the'. air control devices 100 and these will be brought out in more detail in the following specification..

M -for driving the operative parts of the device. A frame 11 is Supported on the base and y this frame in turn supports a frame 12 on which is mounted a hopper 13 which receives ythe material to be pulverized and from whichy the material is fed downwardly through a chute 14. A feed roller 15 is positioned at the lower end .of Ithe chute and a gate valve 1,6 controls the amount of material fed -into a chamber 17 by the roller 15. The roller may be driven in' any suitable manner from the motor M. y' A hinged'cover 18 is positioned at the top of the chamber 17 and can be adjusted to control the admission of air into this chamf ber. H l

The material from the feed chamber 17 is discharged into a pulverizing chamber 20- formcd by a rotatable disk 21, carried by a shaft 22, and by a stationary ring 25 which surrounds the periphery of the disk and extends upwardly therefrom.

The pulverizingchamber is covered at the top by a plate 30 which is secured as shown' in Fig. 4 to side frame members of the supporting frame 11. The ring 25 is secured to the plate lin the manner shown in Fig. 6, namely by hook bolts 31 provided with hooks 32 at their lower ends which engage. in a groove 33 formed in the lower surface of the ring 25. The plate 30 is provided with an opening 35 registeringwith the delivery end of the feed chamber-17 and is also provided with a central opening 36 disposed as shown in Fig. 3 lover the central portion of the disk 21. The plate 30 has secured thereto above tle opening 36, an adjustable iris diaphragm 3 This diaphragm is operated in the usual well known ma'nner by an arm or lever 38 and the central opening 39 in the diaphragm can be ifegulated as to size by moving the arm or lever 38. The disk 21 has formed on or secured to its upper surface a plurality of radial vanes 40 which extendsubstantially to the outer periphery of the disk. The vanes 40 are substantially triangular in shape at their I outer ends as shown at 41 and are also trif angular in end elevation and in'top plan. In

other words, each of the vanes at its outer end 41 has a rearwardly extending` projection which tapers downwardly and rearwardly. The outer ends 41 of the vanes are so formed for the purpose of preventing air pockets in the rear of the vanes which act as a drag and tendvto maintain a-partial vacuum. When such pockets are formed, the pulverized mal terial tends to collect therein.

The upper surface of the disk as shdvvny at 45 is covered with a non-metallic, relatively soft material, such as rubber and the vanes are also covered with rubber or\if desired,

maybe formed of rubber.' This covering on disk 2l at the outer periphery thereof isv slightly elevated or thickened as shown at 46 p for the purpose of giving a slight upward movement of the material being'operated on as it is' thrown the disk.

The front faces 47 of the vanes are sub- 4 stantially radial and the outer ends 48 are inclined slightly with respect thereto. The ring 25 is provided with a series of internal serrations or notches 49 having front surfaces 50 out by the vanes and leaves (with respect to the direction of travel of the isk) disposed substantially radially of the isk. 1

Thus,'when the vanes and the diskl rotate, the material carried thereby will be thrown substantially perpendicularly by the vanes against the surfaces 50 and since the disk rotates at a very high rate of speed, such, for instance, as 5,000 R. P. M., the material will be thrown against the surfaces or facets 50 of the ring at a very high velocity.'

The under surface of the plate 30 as shown at 51is also covered or lined with a non-i metallic, relatively soft material, such as rubber. A fan casing or housing 55 is secured to the top of the plate 30 preferably by welding the casing to the plate. The bottom 56 of the fan casing is spaced from the plate 30 by a downwardly extending annular flange 57 at the outer edge thereof. The flange 57 does.

not extendventirely around the outer edge of the bottom 56 of the fan casing but there is an opening 59 formed therein, the web forming the flange 57 extending inwardly as shown at 60 and 61 to form walls for the opening. The opening 59 forms an air intake for the fan and the size ofthis opening is controlled by adjustable wings 62 and 63 connected by links 64 to a screw 65 which Aextends through a lug 66 and is adjustable by means of

nuts

67 and 68. By moving the wings 62 and 63 inwardly or outwardly; the air intake to the fan can be regulated. y

kThe top o f the fan casing is closed by a cover 7 Owhich is secured to the plate 30 by studs 7l fixed to the plate 30 and extending through the cover plate 70. Nuts 72 are threaded yon the upper ends of the studs and secure the plate 70 in tight engagement with the wall of the casing 55.

The shaft 22 is mounted at its upper and at its upper end as shown at 80, thus providj i ing a shoulder 81. The fan consists of a disk 85 which is secured between washers 86 and 87 `andis provided at its outer end with fan' blades 88. The washers 8 6 and 87 are mount- .ed on the shaft 22. The upper washer 86 abuts 'against the shoulder 81 and the lower Washer 87 is held in position by a sleeve 90 which surrounds the shaft 22.

-The disk 21 is also secured to the shaft by a pair of washers 91` and 92. The washer i 91 above the disk abuts against the lower` end of the sleeve 90 and the Washer 92 is threaded on a threaded portion 93 of the shaft 22 and is held in position by a lock nut 94. It

l will be'evident that as the washer 92 and the lock nut 94 are turned, the impeller or pulveri'zing disk and the fan will be securely clamped in position on the shaft 22. Attention is called tothe fact that thethreads on the portion 93 of the shaft are left hand threads so that tlie rotation of the disk and shaft will not loosen the connection between Y the disk and the shaft.

The under surface of the cover 70 of the fan casing, the upper surface of the bottom 56 of the fan casing, the u per and lowerv surfaces of the fan disk 85, t e inner surface Vof the casing wall and the outer surface of the fan blades 88 are all covered with some suitable non-metallic, relatively soft material, such as rubber as shown at 95 to prevent I valve 101 between the conduits 98 and 99 controls the discharge of the material from the fan casing. The cover plate 70 of the fan casing is provided with an opening 105 controlled by a pivoted gate valve 106A mounted above the cover plate 70 and controlled by a handle 107.

The shaft 22 may be driven in any suitable manner and as shown in the drawings has a pulley 115 mounted thereon connected by a belt 116 to the motor M. Suitable covers 117 and packing washers 118 may 'be provided for the bearings 75 and 76w to prevent dust on extraneous material 'from entering the bearings. Y l

' Operation The material to be pulverized is placed in the hopper -13 and is fed from the chute 14 by the feed roller 15, the amount of material fed being controlled by the .slide valve 16.v

This material thus passes into the feed chamber. 17 `and fromy this chamber is fed by gravity onto the impeller or pulverizing disk 21.

The disk is rotatedatan exceedingly high rate of speed and-the material as it strikes the disk, is immediately thrown outwardly at a high velocity by the vanes 41 and as it strikes the facets 50 on the ring 25 which isv preferably formed of manganese steel or very for preventing air pockets.

material to pass upwardly through the openl ing in the dia hragm 37 when the material is suliiciently dlvided to'be fed upwardly by the suction. The amountv of suction, and,

therefore, the grade of the material fed can y be controlled by several different control f devices, namely, by the damperor gate valve 18, by the adjustable wings 62 and 63 which control the air intake 59, by the adjustable iris Idiaphragm 37,-by the adjustable gate valve 106 and by the slide valve 101 which controls the discharge fromthe fan.

By properly setting these various control valves, the amount of material fed throughv the fan housing and the iineness or grade of the material can-be regulated.

By reason of the coverings on the pulverizing elements and fan elements and also on the fan casing, abrasion of these parts is prevented and they are rendered much more durable and quieter in operation.

From the foregoing description, it will bey seen that the device described comprises few parts, is simple and durable in construction and, furthermore, the device will effectively perform the desired objects.

Although one specific embodiment of the invention has been particularly shown andl described, it will be understood that the invention is capable of modificationand that changes in the construction and in the arrangement of the various cooperating parts may be made without departing from the spirit or scov in the following claims.

What I claim is;

1. A pulverizer comprising a substantially horizontal disk, means for rotating the disk, vanes secured to `and extending upwardly from the upper surface of the disk, an internally corrugated stationary ring extending around the outer periphery of the disk, a fan casing disposed above the disk and having an opening registering with the central portion of the disk, `a fan in said casing, said fan casing having a discharge opening at .the outer periphery thereof, and means for yfeedg material to the outer peripheral portion of said disk.

2. A pulverizer comprising a substantially horizontal rotatable disk, radially 'disposed vanes carried thereby and extending up1 wardly'therefrom, and a ring surrounding said disk land extending above the'disk, said vanes having extensions in the rear thereof 3. A pulverizer comprising a substantially horizontal rotatable disk, radially disposed pe of the invention, as expressed i communicating with the chamber.v

vanes carried thereby and extendingnpwardly therefrom, and a ring surrounding said disk and extending above the disk, said vanes having rearwardly and downwardly tav said chamber having an air intake opening therein and said casing having an opening 5. A pulverizer comprising a substantially horizontal disk, a ring surrounding said disk, vanes on the disk for throwing material against said ring, a plate above said disk and having an adjustable opening therethrough, a fan casing above said plate and spaced therefrom, and a chamber between the fan casing and plate, said chamber having an air intake opening therein and said casing having an opening communicating with the chamber.

6. A pulverizer comprising a substantially horizontal disk, aring surrounding said disk, vanes on the disk for throwing material against said ring, a plate above said disk and having an opening therethrough, a fan casing above said plate and spaced therefrom,

' and achamber between the fancasing and plate, said chamber having an adjustable air intake opening therein and said casing having ing'therein and said casing having an opening against said ring, a plate above said disk and having an opening therethrough, a fan casing above said plate and spaced therefrom, and a chamber between the fan casing and plate, said chamberv having an air intake opening therein and said casing having a central opening communicating with the chamber.

11. A pulverizer comprising a substantially horizontal disk, a ring surrounding said disk, vanes on the disk for throwing material against said ring, a plate above said disk and having a central, adjustable opening therethrough, a fan casing above said plate and spaced therefrom, and a chamber between the fan casing' and plate, said chamber having an air intake opening therein and said casing having an opening communicating with the chamber.

1'2. A pulverizer comprising a substantial- 'ly horizontal disk, vanes carried' thereby, a

an opening communicating with 'tliecham-A ber.

7.` A pulverizer comprising a substantially horizontal disk, a ring Isurrounding said disk, vanes on. the disk for' throwing material against said ring, a plate above saiddisk and having an' adjustable opening therethrough, a fan casing above said plate and spaced therefrom, and a chamberbetween the fan casing and plate, said chamber having an adjustable airwintake opening therein and said casing V having an opening communicating with the chamber. f 8. A pulverizer comprising pulverizing mechanism, a plate covering said mechanism and having an opening'therethrough, a fan casing above said plate and spaced therefrom,

and a chamber between the fan casing and "plate, said chamber having an air intake opening therein and said casing'havino" an opening communicating with the cham er.

9. A pulverizer comprising a substantially horizontal disk, a ring surrounding said disk, 60

vanes on the disk for throwing material 5 against sai-d ring, a plate above said disk and having a central opening therethrough, a fan casing above said plate and spaced therefrom,

and a chamber between the fan casing and plate, said chamber having an air intake openring surrounding said disk, a cover 'plate for said disk having a central opening therein, an-d afan havin'g an intake opening disposed above and in communication with the opening in said plate.

13.- A pulverizer comprising a substantially horizontal disk, vanes carried thereby, a ring surrounding said disk, a cover plate for said disk having a central, adjustable opening therein, and a fan having an intake opening disposed above' and in. communication with theopenilng in said plate.

14; A pulverizer-comprising a substantially horizontal disk, vanes carried thereby, a ring surrounding saiddisk, means -for feeding material to said disk adjacent the outer periphery thereof, a cover plate for said disk having a central opening therein, and a fan having an intake open-ing disposed above and in communication with Jthe opening in said plate. I

l5. A pulverizer comprising a shaft, a substantially horizontally dis osed pulverizer impeller mounted on said s aft, a ring surrounding said -inipeller and a cover plate over said ring, and a fan casing above said impeller and communicating with the pulverizing chamber formed by said impeller, ring and plate. f

16.' A pulverizer comprising a shaft, a substantially horizontally disposed pulverizer ioo A iio izo

impeller mountedv on said shaft; a ring surrounding saidimpeller and a cover plate over said-ring, a f an casing communicating with the pulverizing chamber formed by said impeller, ring and plate, and a fan'in said casing and mounted .on said shaft, said impeller,

cover, fan casing and fan being covered with non-metallic, relatively soft material. d 17. A pulverizer comprising a shaft, a substantially horizontally disposed pulverizer impeller mounted on said shaft, a ring surrounding said impeller and a cover plate over said ring, a fan lcasingcommunicating; .With the pulverizingchamber formed by said impeller, ring and plate, a fan in said casing and mounted on said shaft and a plurality of means for controlling the suction of the fan.

18. 'A pulverizer comprising a feed cham- '1'0 ber, means for'v fee-din@ material into said chamber, said chamber having an opening in v the upper end thereof, means for regulating the size of said opening, pulverizing mechanism communicating with said chamber and receiving material therefrom., and suction means above said pulverizing mechanism for withdrawing the finely divided pulverized material therefrom.

' In Witness whereof, I have hereunto set my 2o. hand this 8th day of November, 1926.

GEORGE D. HARRINGTON,