US1816408A - Coal pulverizer - Google Patents

Description

July 28, 1931.

W. C. STATE COAL PULyERIZER Filed Nov. 8, 1929 2 Sheets-Shet z M/ v a 63624:.

' Patented Jui 28, 1931 UNITED STATES PAT ENT OFFICE WILL 0. STATE, 01 AKRON, euro 3 con. rvnvnarzna Application fled November 8, 1929. Serial No. 405,628.

pulverize frangible substances by means of.

a centrifugal impeller, it is essential that the impeller rotate at a very high speed. The impeller rotating at such high speed, in

conjunction with the pulverized substances that necessarily collect in the drive shaft bearings, produces excessive wear in the bearings, necessitating numerous replacements of the worn parts. Obviously these replacements will decrease the quantity of pulverized substances produced by the apparatus and will also substantially increase the cost of maintaining the apparatus in an efficient operating condition.

In operating the apparatus for pulverizing frangible substances embodying this invention, the substances are fed laterally to a centrifugal impeller, rotating in a vertical plane. The substances are pulverized against an anvil as a result of forces of impact effected by the impeller. Means are provided to elevate the substances from the apparatus after pulverization. By means of this construction, the drive shaft is horizontally mounted in its frame and consequently,

the high speed necessary for eflicient operation of the impeller is not destructive of the bearings for the shaft. Furthermore, means is provided that will prevent the pulverized substances from collecting in the bearings and .replacement of worn parts is thereby substantially obviated. By employing the foregoing arrangement, it is possible to increase the production capacity ofthe apparatus and materially reduce its cost of maintenance.

For a better-understanding of the inven-- tion, reference may now be had to the accompanying drawings, in which:

Fig. 1 is a side elevational view of. a-n'apparatus embodying the invention;

Fig. 2 is a cross-sectional View, upon a larger scale, of the apparatus shown in Fig. 1; Fig. 3 is a cross-sectional view taken sub'- stantially on a line IIIIII of Fig. 2;

.Fig. 4 is a cross-sectional view taken substantially along line IVIV of Fig. 3; and Fig. 5 is a perspective view of one of the buckets.

Referring more particularly to the drawings, the apparatus is provided with a base 10 having a motor base 11 and a support 13. An impeller 14, having a fan 15 mounted on one side thereof, is rigidly secured to a shaft- 16 which is rotatably mounted in a housing 18 by means of bearings 19. The housing 18 is supported upon the base 10 and an adjusting screw 12-threaded into the base and the housing, supports that portion of'the housing adjacent the bearings 19. A coupling 20 connects a shaft 17 of a motor 21 to the shaft 16. The fan 15, rotating at the same speed as the impeller, prevents the pulverized substances from collecting about the bearing 19. The impeller 14 embodies flanged annular plates 22 and 23, a wearing plate 24, including an an: nular shoulder 24a and spaced lugs-24b for positioning a plurality of buckets 25 having concave surfaces 26 and 27, all of which are fastened together by means of bolts 28. The buckets 25 supported by the annular shoulder 24a and the lugs 24b and rigidly secured by the bolts 28, are so spaced as to provide openv ings 29 therebetween. An anvil 30 supported by cooperating shoulders 31 of the anvil 30 and the housing 18 is secured to the housing 18 by means of bolts 32.

A feeding device 34, including a curved by gravity.

A conduit 39, having an enlarged portion 40, and a conduit 41 secured thereto, is mounted on the housing 18 by means of bolts 42.

- 45 and a flange 46, and is secured about the portion 40 by means of bolts 47. A flanged conduit 49, having a'suction pump 50 with an outlet '51 attached thereto, is mounted on the separator 43 by means of bolts 52. As best shown in Fig. 3, a plurality of openings 53 adjacent the bottom of the housing 18 are provided whereby a predetermined volume of air can be admitted into the housing- Regulating dampers embodying a plurality of plates 54 are rigidly mounted on shafts 55 that are operated by means 'of arms 56 and barsor handles 57 secured pivotally to the ends of the arms 56.

The substances to be pulverized are fed to the impeller 14 whence they are pulverized against the anvil 30 as a result of the forces of impact effected by the impeller. After pulverization, the substances are elevated through the conduit 39, the separator 43 and the conduit 49, by means of suction created by the pump 50 and are discharged from the outlet 51 in conjunction with the volume of air passing through the openings 53. The separator 43 is provided for the purpose of returning to the feeding device 34 any particles not pulverized fine enough. By providing the tube 44 with a greater diameter than the diameter of the conduit 39, the velocity of the substances decrease when entering the sieparator 43 whereby unpulverized substances ro fee ing. device 34 by means of the conduit 41. By operating the bar 57, the position of the plates 54 can be so regulated that, only the volume of air necessary to create the suction sufficient to elevate the pulverized substance can pass through the conduit 49. A'conduit 60 having one end secured to the conduit 35 and the other end secured to the housing 18 adjacent an openin 61 is so provided that any unpulverized su stances dropping to the bottom of the housing 18 will be returned to the impeller by mean of a blower 62.

From the foregoing description, it will be apparent that the invention embraces an apparatus that is economical in operation and provides a continuor, and uniform flow of material away from the bearings which might othlerwise be clogged or injured by the materia Although I have illustrated only one formv which the invention may assume and have de scribed in detail but a single application thereof, it will be apparent to those skilled in the art that the invention is not so limited but that various minor modifications may be made therein. without departing from the spirit of the invention or from the scope of the ap ended claims.

hat I claim is:

into the portion 40 and return to the 1.- An apparatus for pulverizing frangible means for actuating the impeller,-means for j separating the substances, and means for elevating the substances after pulverization.

2. An apparatus for pulverizing frangible substances comprising an anvil, a centrifugal impeller including a plurality of buckets, each bucket having two concave surfaces, a shaft secured to the impeller, bearings for the shaft, a fan mounted on the shaft for maintaining said bearings free of pulverized substances, means for feeding the substances to theimpeller, means for separating the-substances, and means forelevating the substances after pulverization.

, 3. An apparatus for pulverizingfrangible substances comprising an annular anvil, a

centrifugal impeller including a plurality of buckets, each bucket having two concave surfaces, a shaft secured to the impeller, bearings supporting the shaft, a fan mounted on the shaft for maintaining said bearings free of pulverized substances, means for feeding the substances to the impeller, means for returning unpulverized particles to the impeller, and means for elevating the substances after ulverization.

'4. in apparatus for pulverizing frangible substances comprising an annular anvil, a centrifugal impeller including a plurality of buckets, each bucket having two concave surfaces, a shaft secured to the impeller bearings supporting the shaft, a fan mounted 'on the shaft for maintaining said bearings free of fpulverized substances, means for laterally ceding the substances to the impeller, meansfor separating unpulverized particles from the substances, and means for elevating the substances after pulverization.

5. An apparatusfor pulverizing frangible substances comprising an annular anvil, a

centrifugal impeller rotating in a vertical I plane including a plurality of solid buckets,

each bucket having two opposed concave surfaces, a shaft secured to the impeller bearings supporting the shaft, a fan mounted on the shaft for maintaining said bearings free'of pulverized substances, means for laterally feeding the substances to the impeller, means for separating unpulverized particles from the substances, means for elevating the substances after pulverization, and means for returning the unpulverized substances to the impeller.

6. An apparatus for pulverizing frangible substances comprising an annular anvil, a

centrifugal impeller including a plurality of buckets, each bucket having two concave surfaces rotating in a vertical plane, a shaftsecured to the impeller, bearings supporting.

the shaft, a fan mounted on the shaft for keeping said bearings free of pulverized substances, means for laterally feeding the substances to the impeller, means for se arating.

unpulverized particles from the su stances, means including a pump for elevating the substances after pu for returning the unpulverized substances to the impeller. v

7. An apparatus for pulverizing frangible substances comprising an annular anvil, a

centrifugal impeller rotating in a vertical ,.plane, having-a pair of flanged plates, a

wearing plate attached to one of the flanged plates, a plurality of buckets intermediate the wearing plate and one ofthe flanged plates, a shaft. secured to the impeller, bearings supporting the shaft, a fan mounted on the shaft for kee ing said bearings free from ulverized-su stances, means for laterally eeding, the substances to the impeller, means for separating unpulverized particles from the substances, means including a pump for elevating the .sub-

stances after pulverization, and means for returning unpulverized substances to the impeller.

In witness whereof,I have hereunto signed my name.

Signed at Akron, in the county of Summit and State'of Ohio, U. S. A., this 4th day of November, 1929.

' WILL C. STATE.

verization, and means

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