US2224375A - Stoker fuel distributing mechanism - Google Patents

Description

Dec. 10, 1940. A. R. CHALKER 2,224,375

sToKER FUEL DISTRlUTING MECHANISMl Original Filed Nov. 18, 1935 2 Sheets--SheeiI 1 NvEN'ToR Alber! R. lCha/kel" Q//Mv ORNEYS Dec. 10, 1940. A. R CHALKER 2,224,375

STOKER FUEL DISTRIBUTING MECHANISM original Filed Nov. 18, 1935 2 sheets-sheet' 2 lNvENToR A/berf R. Cha/ker TORNEYS i Patented Dec. l0, 1940 UNITED STATES PATENT` OFFICE s'roKEn FUEL ms'ramU'rING MEonANIsM Albert n. chalker, Bellevue, ra., assignur to The Standard Stoker Com poration of Delaware pany, Incorporated, a cororiginal application November 1s, 1935. serial No. 50,273. Divided and this application August 10,

1938, Serial No. 224,091

'i claims.

One object of the invention is to provide a stoker of the type described that can be readily and easily applied to the ring opening of a boiler furnace regardless of the slope of the furnace wall.

Another object of the invention is to provide an improved construction and arrangement for separating fine particles of fuel from the coarse particles and evenly distributing them over the re.

Further objects and advantages of the invention reside in the novel construction of parts and the' novel combination and relation of elements, all as brought out in the following description and the appended claims.

In the drawings,

Fig. 1 is a longitudinal vertical central section through a portion of a locomotive boiler, with the novel front end portion of a stoker, in similar section, shown applied to the ring opening in the boiler iirebox wall;

Fig. 2 is a sectional View taken on the line l 2-2 of Fig. 1;

Fig. 3 is a view in front elevation of the novel stoker distributor with parts broken away; and

Fig. 4 is a view in similar section, of the stoker structure shown in Fig. 1 applied to a modified form of boiler back wall.

The invention is shown and described, for purpose of illustration, as applied to a locomotive boiler rebox, but it will become apparent from the following description that the invention is applicable as well to other types of furnaces.

Referring to the drawings, a locomotive indicated generally by the letter A includes a boiler rebox I 0, at the rear of which is the backhead Il having a firing opening I2 therethrough above the level of the locomotive cab deck I3. v

Fuel is conveyed forwardly from a suitable source, as from a tender (not shown), to the locomotive rebox by a stoker, indicated generally by the letter D. The stoker D includes a tubular conduit 4 I sloping upwardly and forwardly through the cab deck I3, and a short nozzle 21 rigidly secured to the backhead II in any suitable manner and communicating with the lower portion of the firing opening I2. At its forward end the conduit 4I is provided with a ball member 28, arranged to be received in the socket portion 29` of the nozzle 21, thereby providing for universal movement between the conduit and nozzle. A screw conveyor 42 is mounted in the tubular conduit 4I and terminates at its forward end within the nozzle 21, making a substantially direct delivery of fuel to the distributing mechanism 43.

The novel distributing mechanism 43 includes a rear section 15 and a front section or distributor table 16 which is rigidly but detachably secured with the rear section 15. The rear section 15 comprises a athorizontal plate-like portion 11, disposed in the firing opening just above the lower wall thereof, and side walls 18 and'19 extending upwardly from the sides of the plate 11 and projecting rearwardly into the nozzle 21, each of the side walls 18 and 19 fitting closely against a respective side wall of the nozzle and being secured theretoby means of the bolts 80 and lock nuts 8l. The openings 82 in the side walls 18 and 19, through which the bolts 88 pass, are preferably in the form of elongated arcuate slots.

A jet head 83 is formed with and extends transversely along the rearward end of the plate 11 and a slotted plate 84 projects upwardly and forwardly from the upper forward edgeV of the jet head 83 over the horizontal plate 11 and between the side walls 18 and 19. The inclined plate 84 'slots' 86 in the plate 84 are longitudinally elongated and are of a width which will permit the ne particles of fuel to pass therethrough and drop onto the horizontal plate 11, the larger particles of fuel passing along the plate 84 and dropping over in front of the jet head 85.

The lower jet head 83 is provided with a transverse steam passage which is lpreferably centrally divided by the rib 81 forming steam chambers 88 and 89, connected at their outer extremities to steam supply pipes 98. A plurality of jet passages 9|, in a horizontal transverse row, communicate with the chambers 88 and 89 and open forwardly through the front wall of the jet head 83 a slight distance above the level of the plate 11. A broad at steam blast issues from the jet passages 9|, sweeping forwardly across the plate 11 for projecting the iine particles of fuel into the rebox.

Likewise, the upper jet head 85 is proinded with a transverse steam passage' which is preferably centrally divided by the rib 92 forming steam chambers 93 and 94, communicating at their outer extremities with the longitudinally extending passages 95 and 96, respectively, which in turn are connected to steam supply pipes 91. A plurality of vertical, transversely spaced ridges 99 project upwardly from the top wall of the jet head 85 and forwardly from the front wall thereof. Each of the ridges 98 is provided with one or more, in the present instance two, jet passages 99 leading from the steam chambers 99 and 94.

'I'he forward edges of the side walls 18 and 19 of the rear section 15 of the distributing mechanism are provided with indentations forming ledges and |0|, spaced a distance below the level of the jet head 85. The distributor table 16 which rests on the ledges |00 and |0 I, is provided with rearwardlyextending arms |02 and |03 that iit closely against the exterior of the side walls 18 and 19, respectively. Bolts |04 extend through the arms |02 and |03 into the side walls 18 and 19 thereby holding the table 16 in place.

The rearcentral portion of the table 16 is provided with an upstanding transverse inverted V-shaped ridge |05 having a sloping front wall |06 and a sloping rear wall |01. The sloping rear wall |01 extends downwardly beneath the l level of the table 16 and rearwardly between the side walls 18 and 19. The crest of the ridge V|05 is slightly forward of the plane of the'front of the ribs 98 and below the level of the lower row of jet passages' 99 so that the sloping wall |01 forms a spill plate whereby fine particles of fuel passing between the ribs 98 will drop from the wall |01 onto the plate 11, from which it is projected into the rebox by the steam blast issuing from the jet passages 9|.l A plurality of inverted V-shaped ridges |08 extend forwardly across the table 16 from the transverse ridge |05, diverging as they extend forward in the manner best shown in Fig. 2. When the coarse fuel is fed onto the ridges |08, it is deflected to both sides of the crest of the ridges and directly into the zone of action of the steam blast issuing from the jet passages 99.

The crests of the ridges |08 are preferably inclined upwardly toward the discharge end of the table 16, that is, in the direction of movement lof the fuel, so that the ridgesare higher at the front or discharge end of the table than at the rear or feeding end where the propelling force-is applied to move the fuel. The object of such a construction is to project or slightly direct upwardly the lumps of coal which are large enough to slide along the ridges |08, thus materially assisting in the even distribution of the coarse fuel over the fuel bed, by increasing the trajectory of the larger lumps of coal.

The under side of the table 16 forms a top deflector for the fine fuel which is projected from the plate 11 by the steam blast issuing from the jet passages 9|, preventing the fine fuel from blowing upwardly due to the expansion of the blast and thus materially aiding in preventing fine fuel particles from being carried over the rebox arch. The under side of the table 16 is provided at its forward corners with depending curved ribs |09 and |0 which deflect aportion of the fine fuel particles to the rear corners of the firebox.

The novel distributing mechanism greatly assists in evenly distributing fuel over the rebox by separating the coarse from the fine fuel and separately propelling and distributing the coarse and fine fuel into the rebox, and minimizes the amount of stack loss by providing materially.

improved means for obtaining a more nearly complete separation of fine and coarse fuel and separately introducing the fine fuel into the firebox beneath the level of introduction of the coarse fuel.

The lower forward wall of the nozzle 21 is provided with a slightly upturned transversely extending rolled edge and the lower rearward end of the distributing device 43 is provided with an arcuate indentation ||2 arranged to receive the rolled edge permitting partial rotation of the distributing mechanism 43 about a transverse horizontal axis. When the lock nuts 8| are loosened, the distributing mechanism can be rotated a distance corresponding to the length of the arcuate slot 82 and adjusted to any one of a number of'positions and secured in that position by tightening the lock nuts 8|. Thus the trajectory of the propelled fuel particles can be adjusted by increasing or decreasing the slope of the distributing table.

The adjustable feature of the distributing mechanism together with the short nozzle 43 and its universal connection with the tubular conduit 4| permits the stoker to be applied to any backhead Whether it be a sloping backhead, or a straight backhead. Thus all parts of the stoker can be made of uniform and standard construction with the exception of the tubular conduit 4|, which can be conveniently and simply made to required length.

This application is a division of my application SerialNo. 50,273, filed November 18, 1935, now Patent No. 2,132,392, granted Oct. 11, 1938.

I claim:

y 1. Fuel distributing means comprising a plate, a fluid pressure jet head at the rear thereof having jet passages directed across said plate, a slotted plate for separating fine fuel from the coarse fuel, said slotted plate extending forwardly from said jet head above the level of said jet passages over said first-named plate, a second jet head at the forward end of said slotted plate, the front face of said last-named jet head having a plurality of spaced vertical ridges to further separate fine fuel from1 the coarse fuel, means for receiving such further separated fine fuel and for directing such separated fine fuel onto said rst named plate, and a plate extending forwardly of the plane of the crests of said ridges for receiving the coarse fuel, said last-named jet head having jet passages directed across said last-named plate.

2. Fuel distributing means comprising a plate, a uid pressure jet head at the rear thereof having jet passages directed across said plate, a slotted plate for separating fine fuel from the course fuel, said plate extending forwardly from said `iet head above the level of said jet passages over said first-named plate, a second jet head at the forward end of said slotted plate, the front face of said last-named jet head having a plu- 'rality of spaced vertical ridges to further separate fine fuel from the coarse fuel, and a plate extending forwardly of the plane of the crests of said ridges for receiving the coarse fuel, said last-named jet head having jet passages directed across said last-named plate, said plate having a downwardly inclining rearward extension arranged to receive the fine fuel passing between the said ridges and guiding it onto said firstnamed plate.

3. In combination with a boiler 4wall having a firing opening therein, a fuel discharge conduit communicating with said firing opening, a fuel eol 2,224,375 j i means extending through saidslots and the walls distributing device arranged-to receive fuel from said discharge conduit, saiddistributing device being mounted-with the bottom wall of said dischargev conduit for pivotal movement about a horizontal transverse axis, said distributing device having longitudinally extending upright side Awalls at its rearward end tting closely .against the side walls of said discharge conduit and .means associated with said side walls for secur-` ing said distributing device in any one of a number of positions.

4. In combination with a boiler Wall having a firing opening therein, a fuel discharge conduit communicating with said firing opening, a fuel distributing device arranged to receive fuel from said discharge conduit, said' distributing device being mounted with the bottom wall of said discharge conduit for pivotal movement about a horizontal transverse axis, said distributing device having a oor forming a continuation of the iloor of said Vdischarge conduitl across which fuelpasses from said discharge conduit-and side walls forming continuations of theside walls of said discharge conduit,l and means Aassociated with the side walls of saidfdistributing ideviceand said dischargeconduit for securing saidydis- ,f tributing device in any one of -ainumber -ofposi vfiring t openingV therein, vajfuelj discharge cnduit f member communicating .with said ilring opening,.-I f l afuel distributing member arranged to receive fuel from said .discharge `conduit member,` said',`

distributing member being mounted v*with thlon'gitudinally extending upright" sidewalls atvjits end fitting'. closely asainstthe sidewalls o ofsaid discharge conduit member, a. slot 'in 'each;

'of the side walls fof onef ofv members, jand "bottom wall of said'discharge conduit Amerxfiber Y for pivotal movement about av horizontal,transfl verseY axis,1 said. distributing member having of the other of said members for securing said distributing member in any one oi' a number of positions. y

6. In. combination with a boiler wall having a ring opening therein, a fuel discharge conduit member `communicating with said ring opening, a fuel distributing member extending forwardly from the forward edge of the bottom wall of said .discharge conduit member, one of the adjacent ends of said members having a transversely extending rolled edge and the other of said adjacent ends having a complementary grooved ,to propel fuel over aj 're, a slotted plat for separating ne fuel from the coarse fuel, said slotted plate extending forwardly from said yJet head t above the .level ofthe `,iet passages of the pressure iuid head,.a second ,iet head at' the forward end of saidfslotted plate,the front face of said lastnamed iet head havinga plurality of spaced verjtical vridgesto further separate line fuel from the coarse fuel, means for receiving such further separated Iiinefuel and for directing such separated `fine' fuel into the zone. of action of said first- `named pressure fluid .iet head, and a plate extending forwardly of the plane of the crests of said ridges for receiving the coarse-fuel, said last lnamed let head having jet passages directed yacross said last named plate.

ALBERT a. CHALKER. y

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