US2022996A - Stoker structure - Google Patents

Description

H. E. LIPPERT 2,022,996

1935 STOKER STRUCTURE Original Filed Jun 20, 1951 INVENTOE Patented Dec. 3, 1935 UNITED STATES PATENT OFFIQE STOKER STRUCTURE Henry E. Lippert,

Pittsburgh, Pa., mesne assignments, to

assignor, by The Standard Stoker Company, Incorporated, a corporation of Delaware 2 Claims. (Cl. 110101) This invention relates to locomotive stokers of the scatterfeed type in which fuel is conveyed and pertains particularly to the locomotive unit or conduit thereof in which the fuel is delivered through the lower portion of a common hand and stoker firing opening.

The principal object of the invention is to provide a stoker structure having a fan shaped transverse series of fluid nozzles positioned in the firebox at or forward of the inside sheet of the locomotive backhead to discharge fuel to the areas of ing opening. nozzles positioned in the firebox to discharge fuel to the areas of. the firebed to which the nozzles are directed, provide a stoker conduit construction that has the advantages of a stoker which conveys fuel directly to the nozzles through the lower portion of a common hand and stoker firing opening, and maintain decreased vertical and lateral dimensions of the firing opening.

To this end, the invention consists in the parts and arrangement of parts as hereinafter described and illustrated in the accompanying drawing, in which Fig. 1 is a fragmentary vertical longitudinal sectional view of the rear portion of a locomotive, showing the invention as applied thereto, the invention being partly in section.

Fig. 2 is a horizontal sectional view of the structure shown in Fig. 1, taken on line 22 thereof.

Fig. 4 is a detail vertical sectional view taken on line 4-4 of Fig.

Fig. 5 is a sectional view taken on line 5-5 of Fig. 1, illustrating the shape of the stoker conduit at that point.

Fig. 6 is a sectional view taken on line 6-6 of. Fig. 1, illustrating the shape of the stoker conduit at that point.

Referring to the drawing, the numeral I designates the firebox; H, the back wall or backhead of the firebox having an opening l2 therein for stoker and hand firing; I3, the krates; M, the mudring; I 5, the cab; IS, the cab deck; and I7, the locomotive frame.

The preferred embodiment of the invention is as follows:

A conduit 23 extends from beneath the deck l6 to the lower portion of the firing opening l2, and

The conduit 23 comprises a riser portion 24 and a delivery spout 25, which are secured rigidly together by studs 26 (Fig. 3). The riser section 24 is inclined forwardly and upwardly, from beneath the rear of the cab deck and the rear of the locomotive frame, through the deck 10 at an angle from the horizontal preferably less than 45; and contains an elevating screw conveyor 21 therein. The elevating screw 21 is supported on the bottom surface of the riser section 24, extends throughout the entire length of the riser section 24 and projects into the rear end of the delivery spout 25; and its upper end terminates at or above the elevation of the lower margin 28 of the firing opening and adjacent thereto. The diameter of the elevating screw 21 decreases toward its discharge end, and the vertical height of the riser section 24 conforms to the shape of the elevating screw. The riser section 24 is substantially circular in cross-sectional shape.

The delivery spout 25 assumes the general form of an upwardly inclined, forwardly projecting and downwardly extending conduit, which opens forwardly in the firing opening. The bo tom wall of this delivery spout 25 is inclined from the horizontal at an angle somewhat in excess of the angle of inclination of the riser conduit 24.

It is inclined upwardly rearward of the backhead, projects forwardly through the lower portion of the firing opening and extends downwardly inside the firebox. The top wall 29 of the delivery spout curves upwardly and forwardly and terminates in the firing opening. It is provided with a flange 30 which forms therewith a recess to receive the firedoor 3|. The firedoor 3! is attached 0 to the backhead in the usual manner and closes the upper portion of the firing opening. The bottom wall 32 of the delivery spout is inclined upwardly toward the firing opening rearward of the backhead and curves forwardly and downwardly in the firebox.

Positioned in the firebox and rigidly secured by studs 33 to the bottom wall of the discharge spout is a distributor table 34. The distributor table 3 is slightly discharge end of elevating screw. The distributor table 3G is provided with an upward extension 31 at the rear thereof and integral therewith, carrying chambers or pasag-es 35. The passages 35 have a double row of transverse nozzles 36 in com- 55 below the elevation of the 43 by bolts 44.

munication therewith. The nozzles 36 are drilled in the upward extension 31 in such a manner that the blast discharged from the nozzles will be fan shaped. The nozzles 36 and distributor table 34 are both forward of the inside sheet 20 of the backhead and below the lower marginal edge of the firing opening. The passages 35 extend transversely at the front of the discharge spout, longitudinally at the sidesof the bottom wall 32 and through the firing opening to the rear of the backhead where they are in communication with pipe lines 33. Pipe lines 38 communicate with a source of fluid pressure in the well known manner, and suitable valves (not shown) are employed in the pipe lines to vary the pressure of the blasts issuing from the nozzles. Although the nozzles 36 and the transverse portion of the passages 35 are shown in the upward integral extension 31 of the distributor table, the passages and nozzles may be located. entirely in the bottom wall 32 of the delivery spout if desired. The bottom wall 32 of the-delivery spout is spacedfrom the lower margin 28 of the firing opening sufficiently to provide a passageway to permit relatively cold air to be drawn through the firing opening to cool the stoker parts exposed to the heat.

The delivery spout is preferably rectangular in cross-sectional shape, the width thereof being substantially the same as the width of the riser section 24, and the cross-sectional area thereof greater than the cross-sectional area of the upper portion of the riser section 25. By not flaring the conduit 23 adjacent the backhead, a narrower firing opening can be provided than the present conventional hand andstoker firing opening used with riser conduits that flare outwardly at their upper end, and fuel is prevented from packing in the spout 25 because of its increased crosssectional area.

To facilitate entrance into the firebox for repairing, etc., the top portion livery spout ismade separate, and detachably secured tothe lower portion of the spout by studs 40. To facilitate trimming the fire, the flow of fuel to the distributor table is governed by hinged vanes 41, one of which is positioned on each side of the outlet end of the delivery spout. The vanes 4| are manually adjusted by means of hand wheels 42.

Provided on each side of the spout is an outward and forwardly extending flange 43. An angle iron 35 is attached to each of the flanges The angle irons 55 are rigidly secured to the backhead on each side of the lower portion of the firing opening by studs 45. Thus, the weight of the forward end of the conduit is vertically supported upon the backhead. The holes 46 in the flanges 43, through which the bolts 44 project, are preferably oval shaped or slotted to provide clearance for the bolts to move therein. When a train of cars surges upon the locomotive frame, causing it to spring slightly upwardly or downward, as occurs when the locomotive stops suddenly, relative movement of the conduit 23 with the backhead will be facilitated by this joint. The angle irons are not rigidly secured to the flanges 43. The bolts 44 are tightened to an extent whereby they will hold the conduit 23 in position, but still allow slight relative movement of the conduit with the angle irons, when there are stresses upon the conduit or locomotive parts.

The rear end of the conduit 23 is vertically supported upon the locomotive frame by a plate 39 of the de- 41. The plate 41 is secured at its upper end to ribs 48, one of which is on each side of the conduit, by bolts 49; and secured to a transverse web 50 on the rear of the locomotive frame by bolts 5|. The plate is of sufficient flexibility 5 to allow longitudinal movement of the conduit with relation to the locomotive frame when the backhead expands from the heat in the firebox. The forward end 52 of the transfer conduit of the Stoker is flexibly connected to the conduit 10 23 by a ball joint clamp 53. A tie bar 54 rigidly secures the rear end of the conduit 23 to the mudring of the boiler and should there be any strains upon. the conduit 23, caused by longitudinal movement of the transfer conduit when 15 starting and stopping the locomotive, they will be directly imposed upon the mudring, and such stresses will not cause distortion of the backhead sheets.

In operation, fuel is conveyed to the lower 20 end of the riser section 24 through a transfer conduit extending beneath the deck of the tender. The fuel may be delivered to the riser section from a transfer conduit which is in end to end relation therewith, as shown, or it may pass into 25 the riser section by gravity. The elevating screw 21 may bedriven separately at its lower end by adriveshaft, or by the conveying means in the transfer conduit, as desired. The fuel is moved through theriser section 24 and the rear of the 30 the elevating screw 21, the fuel of itself to the elevation of a horizontal plane through the highest point of the bottom wall 32 of the spout. The fuel is then pushed forwardly a relatively short 35 distance to a point where it will fall onto the distributor table 34, the path of the fuel from the screw to the distributor table changing more than ninety degrees. By pushing the fuel forward to a point where it falls by gravity onto 40 the distributor table, instead of conveying it directly thereto, it is unnecessary to offset the screw laterally to obtain even delivery of the fuel. The angle of repose of fuel is approximately forty-five degrees, and by having the bottom wall of the spout curved downwardly inside the firebox, the fuel will fall in loose form upon the distributor table without coming in contact with the entire top wall of the spout. The fuel is scattered to all areas of the firebed 50 as it falls into the path of fluid blasts issuing from the nozzles 36. By making the cross-sectional area of the delivery spout greater, than that of the upper end of the riser section 24 the fuel is prevented from packing in the spout.

What I claim is:- 1. In combination, a locomotive firebox having a backwall with a firing opening therein, a fuel feed conduit mounted exteriorly of the firebox arranged to deliver fuel into the lower 60 portion of the firing opening and comprising a lower riser section and an upper spout section, said riser section being inclined upwardly and forwardly toward the backwall and said spout section extending upwardly and forwardly from 55 the riser section to the lower portion of the firing opening at an angle of inclination to the horizontal greater than the inclination of the riser section, said sections having bottom walls meeting at a point rearward of said backwall in a level below the firing opening, the bottom wall of said spout section extending upwardly and forwardly from said point to the lower marginal edge of the firing opening at the outer surface of the backwall and thence turning forscrew conveying the wardly into the firing opening wherein said botriser section to the lower portion of the firing tom wall then slopes downwardly toward the opening at an angle of inclination to the horiinside of the firebox, distributing means at the zontal greater than the inclination of the riser end of said bottom wall within the firebox insection, said sections having bottom walls meetsubstantially equidistant throughout its length surface of the backwall and thence turning forfrom said bottom wall of the spout, and a screw wardly into the firing opening wherein said tion extending upwardly and forwardly from the HENRY E. LIPPERT.

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