US1185526A - Furnace. - Google Patents

Description

R. NIEDERGESAESS.

FURNACE.

APPLICATION FILED DEC. 17. 1914.

Patented May 30, 1916.

2 SHEETS-SHEET Iv llVI/ENTOI? Raloe/"t Niederqesaess BY WITNE88ES:

A TTOR/VEY R. 'NIEDERGESAESS.

FURNACE.

APPLICATION FILED'DEC. H; 1914;.

Patented May 30, 1916.

IIVI/ENTOR 2 SHEETS-SHEET 2.

A TTORA/EV UNITED STATES-PATENT OFFICE.

ROBERT NIEDERG-ESAESS, SEATTLE, WASHINGTON, ASSIGNOR TO AMERICAN SMOKE LESS BURNER COMPANY. A. CORPORATION OF WASHINGTON.

FURNACE.

To all whom it may concern: I

Be 'it known that I, ROBERT NIEDERGE- SAESS, a citizen of the United States, residv ing at Seattle, in thecounty of King and State of Washingtomhave invented certain new and useful Improvements in Furnaces, of which the following is a specification.

This invention relates to mechanically operated stokers for furnaces andis in the nature of improvementsto th invention for which I filed a patent application January 15, 1914, bearing Serial No. 812,254.

The object of my improvements is the perfecting of apparatus of this character to render the same more eflicient in operation, which will afford a uniform fuel feed and cause the same to be consumed with little waste. I The invention consists inv the novel construction, adaptation and combination of parts, as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a longitudinal vertical section of apparatus embodying the present invention. Fig. 2 is a plan view of the same, but with the fender plates disposed in different positions from which they are illustrated in Fig. 1. Fig. 3 is a view shown partly in end elevation and partly in vertical transverse section of the mechanism. for supplying fuel to the fuel'receptacle of the furnace. Fig. 4 is a horizontal section taken substantially through 44 of Fig. 1.

The reference numeral 5 designates a table which is supported on posts 6 and may constitute the base of a furnace. Depending from said table and rigidly secured thereto, asiby bolts 7 is a fuel receptacle 8 of substantially the shape of an inverted frustum of a cone. Disposed axially of said receptacle and extending upwardly from the fioor 9 thereof is a tubular column 10 provided exteriorly with a helical rib 11 similar to the thread of a screw. Extending down into the receptacle 8 is the casing 12 of a fire-pot which is lined with fire-brick 13 or an equivalent. This fire-pot is of a funnel-shape having an upper flaring portion 14 and a throat 15 therebelow of asubstantially cylindrical form with a diameter somewhat greater than the diameter of the outside of the rib 11 of the column which extends through said throat. Said Application filed December 17, 1914. Serial No. 871,679. 1

Specification or Letters Patent. 1 Patented May 30, 1916.

fire-pot is provided with an external .flange T or track element 16 Which is mounted upon rollers or wheels 17 journaled upon axles 18 supported in suitable boxesprovided in the peripheral wall of the receptacle 8.

Exteriorly'of the fire-pot casing 12 is a helical flange or screw-blade 19; -R'idges 20 and 21 respectively project inwardly from the walls of the receptacle 8 and the throat 15 and are inclined from vertical planes extending radially of the axes of'thereceptacle and throat. p

22 represents a pipe whereby water is supplied tothe receptacle to approximately the level indicatedby W L in Fig. 1. Provided on the fire-pot casing are peripheral gearteeth 23 which mesh with a spur-gear 24 mounted on an upright shaft 25 which is rotated by gears 26 from an upright shaft 27 The latter, in turn, is rotated by bevel gears 28 from a horizontal shaft 29 which is driven from a motor 30 by a belt 31 passing about pulleys 32 and 33 on the shaft 29' and the armature shaft of the motor.

34 represents a rotary fan or blower which is driven from the motor 30 by a belt are sloped circumferentially to afiord a screw-like structure which tends to cause the revolving fuel engaging thesame to be forcedupwardly. One of the horns, 38 extends as shown in Fig. 1, above the other horns and serves to disrupt or break masses ofcoke or clinkers which may impinge the horn.

The perforations 40 of the various horns are disposed at thesides of the latter in the direction in which the fuel is revolved so that there is no danger of their becoming choked by fuel being forced thereinto.

In the operation of the apparatus, the solid combustion products thereof are forced upwardly from the fire-pot onto the rim of the latter, and in their revoluble travel they encounter a horizontally disposed ,plate 41 having an inclined guiding face 41 (Fig. 2) y Included in the invention is a conveyer for feeding the fuel to the receptacle 8. Said conveyer consists of a chain belt 43 operating in ,a trough 44 leading from a coal hopper 45 into said receptacle, as best.

shown in Fig. 3. The chain 43 passes about i an idler 46 and a sprocket-wheel 47 which is mounted'upon a shaft 48. This shaft is intermittently rotated by having a ratchet wheel 49 thereon engaged by 'a springpressed pawl 50 which is carried by a vibratory arm 51 loosely mounted on the shaft 48. The arm 51 is actuated by a pitman 52 from a pin 53 of a crank shaft 54 which is rotated by means of a belt 55 from the shaft 29. a The conveyer chain 43, as shown in Fig. 3,

passes into the receptacle 8 to deposit the coal therein and, to prevent any lumps reaching the sprocket wheel 47 the chain is caused to pass through a slot 56 of a bracket-piece 56 Subjacent to the fire-pot and rotatable therewith is a plurality of curved blades 57, Figs. 1 and ,4, which serve to impart revoluble motion to the coal and transmit the same centripetally to the thread 11.

In operation, the fire-pot is continuously rotated whilethe receptacle 8, the screw column 10 and the twyer head 37 are immovable. The fuel in the nature of coal is fed into the receptacle by means of the conveyer' chain 43. The fuel thus deposited within the receptacle falls into the water contained in the receptacle, and .is forced down by the revolving screw-thread 19 acting in coeperation with the ribs 20 which tend to prevent anyturning of the coal until it is brought within the scope of scoopblades 57. When this occurs, the revolving blades 57 impart corresponding motion to the coal and cause it to progressively travel to the stationary column 10. The revoluble movement of the coal when it encounters the screw-thread 11- of said column causes it to be thereby raised through the throat 15 into the upper portion 14 of the fire-pot. In such ascending movement of the coal, it is given a rotary movement which is afforded by the revolving ribs 21 and by contacting with the inner periphery of the fire-pot. As the coal is thus turned, it is subject to the heat due to the burning at or near the top of the pot, and becomes more or less coked, which is principally broken up by being impinged against the horns of the twyer head. Lumps of coke which may overflow the firepot are pushed back into the latter by the inclined face41 of plate 41 and the ashes in the form of clinkers, upon engaging the plate 42, are directed thereby over the top .of the table 5. Ihe'fire is sealed with reat a speed to supply coal sufficient to meet the demand, and through the offices of the stationary and rotary screw-devices and the revolving scoop-blades the fuel is elevated to be burnt in the fire-pot.

What I claimeas my invention, is

1. In a device of the class described, a fuel "receptacle, a rotary'fire-pot having an open bottom, and fixed means coacting with said rotary fire pot for progressively elevating fuel from said receptacle into said fire pot.

2. In a device of the class described, a fuel receptacle, a rotary fire-pot, and screw de' vices extending from the receptacle and affected by the rotation of said fire-pot to elevate fuel into the latter from said receptacle.

3. In a device of the class described, a fuel receptacle adapted to hold water to a predetermined depth, an annularfire pot positioned within the receptacle, means to rotate said fire pot, and non-movable means coacting with said rotatable fire pot to elevate fuel into the space within said fire pot.

4. In a device of the class described, a fuel receptacle, an annular'fire-pot extend.- ing into said receptacle, means to rotate said fire-pot about a vertical axis, said receptacle being supplied with water to submerge the lower end of the fire-pot, means rotatable with the fire-pot for moving the fuel centripetally of the receptacle and below the firepot, and means extending into the fire-pot for elevating the fuel receivedv from the aforesaid means up into the fire-pot.

5. In a device of the class described, a fuel receptacle,'an annular fire-pot disposed to rotateabout the vertical axis of said recepthe fuel into position to be elevated by said column,and means to supply air for combustion purposes through the column.

7. In apparatus of the class described, a rotary fire-pot, means actuated by the -rota'- tion of the fire-pot for progressively elevating fuel into the fire-pot and eventually causing the residue of the consumed fuel to be discharged upon the top of the fire-pot, and

' means rendered effective by the rotation of the fire-pot for effecting the removal'of such discharged residue from the top of the firep'ot.

8. In apparatus of the class described, an annular rotary fire-pot, means for elevating fuel into the fire-pot to be burned and deliv:v

ering the resultant ashes upon the top of the fire-pot, a relatively thin deflector inclined with respect to the radii of the fire-pot for. returning into the latter unconsumed portions of the fuel which may be delivered upon the top of the fire-pot with the ashes, and means for moving the ashes away from the fire-pot.

9. In apparatus of the class described, .a

fuel receptacle, means. for effecting the movement of fuel from the peripheral wall of said receptacle toward the center thereof,

a rotary annular fire-pot, screw devices 00-.

operating with the fire-pot for elevating the fuel inthe fire-pot, a tubular member extending axially into thefire-pot, a twyer-z head provided for said member, and means for supplying air under pressure to the twyer head through said member.

10. In apparatus of the class described, a

fuel receptacle, means for effecting the movements of fuel from the peripheral wall of said receptacle toward the center thereof,

a rotary annular fire-pot, screw devices 00- operating with the fire-pot for elevating the fuel in the fire-pot, a tubular member extending axially into the fire-pot, a twyerhead formed with a radially directed perforated horn fixedly secured to said member.

11. In apparatus of the class described, a

fuel receptacle, means for effecting the movement of fuel from the peripheral Wall of said receptacle toward the center thereof, a

rotary annular fire-pot, screw devices cooperating with the fire-pot for elevating the fuel in the fire-pot, a tubularv member ex tending axially into the fire-pot, means for supplying air under pressure through said member into the fire-pot, and means secured to said member for breaking the coke or screw coacting'with said fire-pot to elevate clinkers when the same are revolubly moved into contacttherewith by the turning of the fire-pot.

12. A device of'the class described, comprising a fuel receptacle, a rotary fire-pot having an opening in its bottom, a stationary fuel into the latter, and a twyer-head secured to the top of said stationary screw.

13. A device of the class'described, comprising'a fuel receptacle, a' rotary fire-pot disposed within said fuel receptacle, a sta-.

tionary screw coacting with said rotary firepot for elevating fuel into the latter, said stationary screw being providedwith an air passageway, and atwyer-head secured to the top of said screw and connected with 7 said passageway, said twyer head being provided with radially directed perforated horns for breaking coke or clinkers when the same are moved into contact therewith by r the rotation ofsaid fire-pot.

14. A device of the class described, comprising a rotary fire-pot having an axially disposed stationary screw to coact with said fire pot and elevate fuel thereinto, a twyerhead on said screw, said twyer-head being provided with a radially projecting horn adapted to engage with moving masses of fuel to break up such moving masses.

' 15. A device of the class described, comprising a rotary fire-pot having an axially.

disposed stationary screw adapted to coact with said fire-pot to convey fuel thereinto.

16. A deviceof the class described, comprising a fuel receptacle, a rotatable fire-pot disposed therein, scoop-blades rotatable with said fire-pot to move fuel toward the center of said fuel receptacle, and a stationary screw coacting with said scoop blades and said rotary fire-pot to convey fuel into said fire-pot.

'17. In apparatus of the class described, a

fuel receptacle,,means for effecting themovement of the fuel from the peripheral wall of said receptacle toward the center thereof, a rotary fire-pot and stationary screw devices coacting with the rotatory movements of said fire-pot for elevating the fuel in 'the 18. An underfeed furnace comprising a furnace chamber, a rotative firepot therein, means toconduct air to the firepot, a' fixed upstanding centrally arranged. spiral ledge extending upwardly through the firepot, and means to deliver fuel to the chamber and force it inwardly in a compact mass against said spiral flange or ledge.

19. An underfeed furnace comprising a furnace chamber, a rotative firepot therein,

means to conduct air to the firepot, a fixed upstanding centrally arranged spiralledge' 4 extending upwardly through the firepot,

ledge, anda'fixed ash scraper above the firepot to scrape the ashes outwardly away from the rotative firepot.

21. An underfeed furnace comprising a furnace chamber, a rotative firepot therein,

an air conduit extending upwardly through the chamber and into the firepot with means ,for forcing air therethrough, said conduit being provided within the firepot with a fixed spiral flange or ledge, spiral fuel feed arms rotative in said chamber with the firepot, and means to deliver fuel to the chamher in the path of the said arms.

22. An" underfeed furnace comprising a furnace chamber, a firepot therein,anti-friction bearings between said firepot and'the "fixed Walls of the chamber, means for rotating' said firepot, spiral fuel feed arms extending outwardly from the open lower end Tof the firepot over the floor of the furnace chamber, means to feed fuel into the chamber into the path of the said arms, a fixed upright centrally arranged spiral ledge withinthe rotative firepot, and means to force air into the fire bed.

23. An underfeed furnace comprising a furnace chamber, a rotative firepot therein, anti-friction bearings between-said firepot and the fixed wall ofsaid chamber, spiral fuel feed arms extendingoutwardly from the lower open endjof the firepot over the fldor of the furnace chamber, means to feed fuel into the chamber into the path of said arms, a fixedupright centrally disposed spiral ledge'within the firepotfsaid firepot being provided with an annular rack, and a said arms, a fixed uprightcentrally disposed spiral ledge within the firepot, said firepot being provided with an annular rack, a

' pinion meshing with said rack, means to rotate it, an air blower for delivering air to the firepot, and a motor for driving said fan and connected by a speed reducing train of gears to said pinion.

25. An underfeed furnace comprising a furnace chamber, a rotative firepot therein, a fixed upstanding air conduit provided within the firepot with exit openings and with a spiral ledge, spiral fuel feed arms rotative with the firepot, means to feed fuel to the chamber into the path of said arms, and

means to scrape the ashes from. the ash bed above the fire'pot.- I v Signed at Seattle, Wash, this v8th day of December, 1914. 7

ROBERT nrnnnaensanss,

Witnesses E. PETERSON,

HORACE BARNES.

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