US1495075A - Centrifugal drier - Google Patents

Description

May 20, 1924. v 1,495,075

I H. F. HOYLE I CENTRIFUGAL DRIER Filed Jan.. 6. 1921 2 Sheets-She et 1 May 20 1924. 1,495,075

H. P. HOYLE CENTRIFUGAL DRIER Filed Jan. 6, 1921 2 Sheets-Sheet 2 Patented May 20, 1924.

HENRY PATRICK HOYLE, OF DURHAM, ENGLAND.

GENTRIFUGAL DRIER.

Application filed January 6, 1921. Serial No. 435,438.

To all whom it may concern e Be it known that I, HENRY PATRICK HOYLE, a subject of the King of Great Britain, residing at 46 North Bailey, Durham, England, have invented new and useful Improvements in Centrifugal Driers, of which the following is a specification.

This invention relates to improvements in centrifugal driers, and its object is to Pro vide an improved drier which shall be especially suitable for drying coal but may be used for drying other materials. According to this invention I provide within a vertical cylindrical screen a perforated vertical drum having upon its periphery a scroll and I provide means for' rotating both the screen and the drum, the lat? ter at a slower speed than the former, so that the scroll moves the material down through the drier, whilst the whole is being rotated. In some cases I may provide at the bottom of the drum a fan adapted as the drum rotates to draw air into the interior thereof and I perforate the sides of thedrum, to allow this air to pass through the material and so assist in drying it. Vanes may also be provided at the top of the screen around the periphery thereof to exhaust the air.

The screen is preferably constructed of segments secured together, each segment consisting of a metal frame supporting anumber of vertical rods mounted on which are wedge shaped wires.

A disintegrator may be fixed to the shaft upon which the screen is mounted.

My invention is illustrated by the accompanying drawings, Figure 1 of which is a vertical section through a drier, Figure 2 is a section on a larger scale of part of the screen,F igure 3 is an elevation of one of the segments of the screen, Figure 4 is a plan thereof and Figure 5 an enlarged perspective view of part of the screen.

A central shaft 1 has a shoulder 2 at which is keyed a spider 3, the periphery of which carries a circular wedge wire screen 4 whilst the arms form a fan 5 for drawing air through a duct 6 and discharging it through the screen 4. At the top of the screen 4 are attached fan blades 7 which draw air in an upward direction throu h the screen 4. At the lower end of shaft 1 1s keyed a cylinder 8 on the outer side of which are fixed bars 9 on whose outer ends rings 10 are threaded and riveted thereto.

The shaft 1 is supported by a thrust bear ing 11 and rotates in a ball bearing 12 and bushings 13 within a hollow shaft '14 on whose lower end is a flange carrying a drum 15, on the barrel of which is formed a scroll 16 having an increasing pitch in its downward direction. The barrel of the drum consists of a series of vertical flat bars, the spaces between which Et-llOVLOf the passage of air from the fan 5. The shaft 14 rotates in a ball bearing 17 and is supportedin thrust bearing 18. The shaft 1 is driven by mitre wheels 19 and 20 having spiral teeth andthe hollow shaft 14 is driven by bevel wheels 21 and 22 having spiral teeth, the mitre wheel 19 and bevel wheel 21 being mounted on a countershaft 23 rotating in ball bearings 24 and 25 and driven by a belt pulley 26. The rotating par-ts are enclosed in a casing built up in four main parts 27, 28, 29 and 30.

The part 27 carries the bearings of the countershaft 23 and the bearings of the shaft 14. The part 28 surrounds the screen 4. The part 29 has an inclined circular duct 31 which receives the separated water and carries the bearings for the shaft 1. The part 30 carries two or more rows of bars 32 on to whose ends rings 33 are threaded and riveted thereto. The bars 32 form with the bars 9 a disintegrator. To the lower flange of the part 30 is attached a hopper 34. A chute '35 delivers the wet coal to the machine.

The screen may be made bf-perforated plates or bars, but I prefer to construct it as shown in Figures 2 to 5. 36 is a frame secured to the top and bottom plates of the screen and supporting verticalrods 37 round which are coiled wires 38 of circular section at the parts surrounding the rods 37, the parts between the rods being wedge shaped as shown in Figures 4 and 5. The coiled wires 38 abut against each other and hold the wedge shaped parts at the desired distance apart. Alternating with the rods 37 are other rods 39 which need not be secured to the top and bottom members of the frame 36 The operation of the machine is as follows Wet coal is delivered to the machine through the chute 35 and falling upon the outer surface of revolving drum 15 is thrown by centrifugal force upon the revolving screen 4. The scroll 16 rotating in the same direction as the screen '4 but at a somewhat lesser speed gradually scrapes the coal downwards along the faceof the screen, and owing to the increasing pitch of the scroll the film of descending coal becomes deeper andthinner, the extraction of the water thereby being facilitated. As the film of coal is descending a current of air produced by the fan 5 on the spider 3 assisted by theblades 7 is forced through-the coal and ascending through openings in part 27, carries away a portion of the moisture. The coal from the screen falls upon the revolving bars 9 of the disintegrator below and is broken up into'fine dust and falls into the hopper 34. The water which has been forced through the screen passes into the inclined duct 31 and flows ,to the lowest point where an outlet is provided.

What I claim is 1. In a centrifugal drier, the combination of a shaft, a vertical, cylindrical screen fixed to the shaft, a hollow shaft mounted upon the first-mentioned shaft, a perforated, vertical drum fixed to the hollow shaft, a scroll on the outside of the drum. a fan on the shaft below the drum for forcing air through the perforated drum and through the screen, fan blades atv the top of the screen for exhausting air from the drier, and means for rotating the shafts at different speeds.

2. In a centrifugal drier, the combination of a shaft, a vertical, cylindrical screen fixed to the shaft, ahollow shaft mounted upon the first-mentioned shaft, a perforated. vertical drum within the screen and fixed to the hollow shaft, a scroll of increasing pitch fixed to the drum, a fan on the first-mentioned shaft below the drum for forcing air through the drum and the screen, andmeans for rotating the shafts at different .speeds.

3. In a centrifugal drier, the combination of a vertical. cylindrical screen constructed of wedge-shaped wires, a perforated, vertical drum withinihescreen. a scroll on the drum for feeding material down through the drier. and means for rotating the screen and drum at different speeds.

4. In a centrifugal drier. the combination of a shaft, a vertical.cylindrical screen constructed of wedge-shaped wires fixed to the shaft, a hollow shaft mounted on the other shaft, a perforated, vertical drum fixed to the hollow shaft Within the screen, a scroll on the drum, a fan on the shaft below the drum, and means for rotating the shafts at different speeds. t

5. In a centrifugal drier. the combination of a shaft, a vertical, cylindrical screen fixed to the shaft, a hollow shaft mounted on the first-mentioned shaft, a perforated, vertical drum fixed to the hollow shaft, a scroll of increasing pitch from one end to the other on the outside of the drum and between the drumand the screen, a fan on the shaft below the drum for forcing air through the drum and the screen. and means for rotating the two shafts at different speeds.

6. In a centrifugal drier. the combination of a vertical, cylindrical screen constructed of wedge-shaped wires, a perforated vertical drum within the screen. a scroll of increasing pitch from one portion to another on the drum for feeding material down through the drier, and means for rotating the screen and drum at different speeds.

' 7. In a' centrifugal drier. the combination of a shaft, a vertical, cylindrical screen con-' structed of wedge-shaped wires fixed to the shaft, a hollow shaft mounted on the other shaft, a perforated vertical 'drum fixed to the hollow shaft within the screen, a scroll of increasing pitch from one portion to another on the drum, a fan on the shaft below the drum, and means for rotating the shafts at different speeds.

- 8. In a centrifugal drier, the combination of a. vertical, cylindrical screen constructed of sections of wedge-shaped wires, a perforated, vertical drum within the screen. a scroll on the drum for feeding material down through the drier, and means for rotating the screen and drum at difierent speeds.

9. In a centrifugal drier. the conlbination of a shaft, a xertical-erlindrical screen constructed of sections of wedge-shaped wires fixed to the shaft. a hollow shaft mounted on the other shaft. a perforated. vertical drum fixed to-the hollow shaft within the screen. a scroll on the drum. a fan on the shaft below .the drum, and means for rotat ing the shafts at different speeds.

In testimony that I claim the foregoing as my invention I have signed in name this 23rd day of December, 1920.

HENRY PATRICK HOYLE.

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