US1828818A - Stoker - Google Patents

Description

Oct. 27, 1931. F. P. ROESCH ET AL sTokER 2 Sheets-Sheet 1 Filed April 15, 1924 with an im roved and upwardly inclined Patented Oct. 27, 1931 i UNITED STATES BATENT OFFICE FRANK r. ROESGH, or CHICAGO, ILLINOIS, AND ANDREW M.'HUN'1, or NEW YORK, N. Y.,

ASSIGNORSTO STANDARD STOKE-R DELAWARE Application filed April 15,

A broad object of our invention is to increase the ruggedness, reliabilit and. convenience of operation in stokers o the type in which coal is conveyed to the door end of and upwardly into the fire-box' of a boiler by means of a conveyor and distributed over the fire bed by means of steam jets, or other well-known means.

Another object is to construct such a stoker conveyor tu provided with a worm and having a short elbow and a mouth just within thefire-box and below the feed-door opening. The raising of coal to and the discharge of coal from the mouth .or mouths in convenmately perpendicular elevator screw, or

Screws 0! Inn 81 01' 11111 GI'S' se arate means being used to efi'ect the horizontal movement of the coal from the tender or bunker to the bottom of the elevating means.

Vertical screws are, however, troublesome in that the coal may pack at the bottom of the i screw when it is reversed and stall the conaccumulate and carbonize or volatilize the lubricant, as well as being inaccessible for inspection and maintenance.

Another object is to so design our inclined conveyor and mouth that the coal will have such a very short and direct passage from the j,

forward end of our inclined screw to the mouth that arching and blocking the disa charge at the mouth will be avoided.

Another object is to make the elbow bellmouthed to assist in preventing arching of the coal beyond the forward end of our inclined screw.

In the conventional type of stoker conveyor COMPANY, INCORPORATED, A; CORPORATION OF STOKER 1924,. Serial No. 706,651. a i g provided with both a horizontal and a vertical screw the coal is discharged from the. mouth symmetrically, but with our single inclined screw, the flow of the coal would tend to contion of the distributing jets of steam ineflective for covering the side portions of the fire at the rear of the fire-box, which must be overcome in order that our stoker may operate satisfactorily; therefore,

Another object of our invention is to provide some means to regulate the flow of the coal beyond the end of our single inclined screw, preferably narrow ribs on the interior surface of the forward end of the inclined conveyor tube and elbow, said ribs being substantially parallel with the axis of .the con veyor tube and elbow. These ribs assist in checking the tendency of the coal to rotate with the screw, cause its, advance to be more direct, and facilitate its distribution by the steam jets. r This. last mentioned object may also be at least partially accomplished by moving the distributor jets forwardinto an improved position at which the jets will be substantially surrounded by the flow of coal normally emerging from the front of the mouth, and by giving the jets suitable directions of discharge. V Another object of our invention is to adapt receive our improved stoker. This may be accomplished by buildingthe boiler with anovel designof mud ring having a. central arch extending almost up to the fire door opening. I

This novel andextremely higharch in the mud ring of a locomotive boiler used in combination with our improved stoker, is advantageous in shortenin the distance travthe conventional type of locomotive boiler to eled by the coal beyond t e inclined conveyor screws as much as possibleand thus' preventring archin of the coal before it reaches the positionlw ere it is acted upon by the distributing steam jets.

Another ob'ect is to utilize universal joints at the forwar ends of the horizontal portions v 4 tance beneath the feed door.

of both the conveyor tube and the conveyor screw to perform a double function, namely, the conventional function of compensating for relative movement between locomotive and tender and the additional function of changing the direction of the flow of coal from a substantially horizontal to an upwardly inclined direction.

When our improved stoker is installed on marine or stationary boilers of a type having no rear water leg no structural changes in the boiler are necessary and it need only block the deck or boiler-room floor for a short dis- Our improved stoker when thus installed has the great advantage of eliminating from proximity to the ash pan or ash pit all parts which require lubrication and frequent inspection and adjustment.

Other objects may appear from the following detail description of the preferred construction.

Referring to the drawings: I Fig. 1 is a fragmentary longitudinal elevational "iew, partly in section, of our improved stoker and associated devices.

Fig. 2 is a section taken on the line 22 of Fig. 1.

Fig. 3 is a longitudinal vertical section on an an enlarged scale of some of the partsshown in Fig. 1; and

Fig. 4 is a section taken on the line 44 of Fig. 3 certain of the parts being omitted.

The numeral 1 indicates the rear end of a locomotive boiler, provided with a feed door opening 3, a combustion chamber or fire bO 5, a fire body 7, and fine particles of burning coal 9. The cab deck is indicated at 11, provided with a grating 12 through which the coal in the conveyor may be observed, and the deck of the tender is indicated at 13.

At 15 the conventional coupling gear of the locomotive is indicated, at 17 a conventional bumper, and at 19 the frame of a tender 'upon which is mounted a conventional conveyor trough 21, provided with a shaft 23 and gearing 25 at the rear end thereof to drive a conventional conveyor 27 in the 'tou h21. 50 g Shaft 23 is driven through shaft 29 from engine'31, which is mounted on the locomo- .tive in a conventional manner and the conveyor 27 extends forward in the conventional manner intothe conveyor tube 33, which is provided with universal joints 35 and 37.

The universal joint 37 is positioned at the lower end of our improved upwardly inclined forward conveyor tube 39, which forms a continuation of tube 33, and which is mounted in a conventional manner on feet 41 and 43 which are respectively mounted on brackets 45. and 47, secured to adjacent parts of the locomotive.

The tube 39 is provided with an elbow 49 and a bell-mounted extension 51, having a llhe elbow 49 is provided with a guide 59,-

preferably of hard steel, which is designed to prevent the inclined portion 28 of the conveyor 27 imparting rotation to the coal in the elbow 49. lhe guides 61 and 62 are designed to straighten the flow ofcoal emerging from the mouth 52, to facilitate the operation of the jet distributor '53.

However, the coal tends to flow more freely at the left, according to Figs. 1, 2, and 3, of the mouth 52, and for this reason the conventional position of the jet distributor is less satisfactory than the indicated improved forward position of the distributor or distributor head 53.

In order to shorten the flow of coal be tween the upper end 65 of conveyor 28 and mouth 52 to the utmost, so as to prevent the possibility of arching of coal in elbow 49 and without the addition of extra parts at this hot portion of the apparatus where lubrication and maintenance is difficult, it is desirable to arch the mud ring 67 of the locomotive boiler 1, as shown in the drawings, and particularly in Fig. 1.

When, however, our improved stoker is applied to boilers without rear water legs, such for instance as conventional marine boilers, no structural change. in such boilers is necessary. In such boilers it is merely necessary to provide an opening or arch at the desired position in the boiler casing or setting.

It should benoted that the universal joint 37 and also the universal joint '69 connecting the parts 27 and 28 of the conveyor screw are conventional, but that in our improved device these universal joints 37 and 69, because.

of the inclination of tube 39, cooperate to perform a double function.

The conventional function is to compensate for relative movement between engine and tender, and the additional function is to change the direction of flow. of the coal upward toward the level of mouth 52, which is conventionally performed by additional.

devices such, for instance, as a vertical screw or plunger. By inclining the conveyor tube 39 upwardly and passing it through the space provided in the backhead, the terminal with a space above the level of the lowermost portion of the said-wall for passing a fuel carrying conduit, an upwardly inclined vfuel conveyor tube passing through said space into said fire box'and having at its end a relatively short delivery p'ortion curved to turn the .fue'l upward to the point of delivery, means within the inclined conveyor tube terminating adjacent the curved base of said delivery portion for advancing and raising the fuel tosaid delivery portion and forcing it up therethrough to said point of delivery, and means at the upper end of said delivery portion for distributing the fuel over the 2. In combination, a furnace comprising a firebox having an upstanding wall formed with a space above the level of the lowermost portion of the said wall for passing a fuel carrying conduit, anupwardly inclined fuel conveyor tube passing through said space into said fire box andhaving at its end a relatively short delivery portion curved to turn the fuel upward to the point of delivery, means within the inclined conveyor tube terminating adjacent the curved base of said delivery portion for advancing and raising the fuel. to said delivery portion and forcing it up there- 1 through to said point of delivery, and means at the upper end of said delivery portion for distri ,uting the fuel over the fire, the length the central vertical axis of the delivery portionfrom its point of intersection with the axis of the rearward inclined said fire box and having at its end a relatiyely short delivery portion curved to turn the fuel upward to the pointof delivery,

means within the inclined conveyor tube terminating adjacent the curved-base of said de- 1 livery portion for advancing and raising the fuel to said delivery portion and forcing it up therethrough to said point of delivery, and

means at the upper end of said delivery portion for" distributing the fuel over the fire,said means comprising a distributor headwith its end spaced from the center of said delivery portion. u

4. In combination, a furnace comprising a fire box having an upstanding wall formed cov with aspace above the level of the lowermost portion of said wall for: passing a fuel carrying conduit, an upwardly inclined fuel conveyor tube passing through said space. into said fire box'and having at its end a relatively short delivery p'ortion curved to turn the fuel upward to the. point of delivery, means within the inclined conveyor tube terminating adjacent the curved base of said delivery portion for advancing and raising the fuel to said delivery portion and forcing it up therethrough to said point of delivery, guide means within the delivery portion preventing rotation of the fuel, and means at the upper end of said delivery portion for distributing the fuel over the fire. i

5. In combination a locomotive furnace comprising a fire box having an upstanding wall formed with a space above the level of the lowermost portion of said wall for passing a fuel carrying conduit, a conveyor tube for fuel comprising a rear section and a for- /ward section and a connecting joint between them, the forward section inclining upward from said joint and passing through said space into said fire box and having at its end a relatively short curved delivery portion receiving the fuel and turning it upward, means within, the inclined conveyor tube terminating adjacent the curved delivery portion for advancing and raisingthe fuel to said delivery portion and forcing it up therethrough to said point of .delivery, guide means within the delivery portion prease of said 7 venting rotation of'the fuel, and means at 'theupper end of said delivery portion for distributing the fuel over the fire.

6. In a stoker for a fire box of a furnace the combination with an upwardly inclined fuel conduit having fuel advancing means within it, said inclined conduit extending through the plane of the back wall of the fire box and having a substantial portion above the bottom of the fire box at the point where it passes the plane of the back wall of an upwardly turning extension of the conduit adapted to extend above the normal level of the fire bed in the fire box and having a flaring delivery mouth, and a steam nozzle 10- cated above the mouth and within the area, i

thereof and having forwardlyand laterally directed discharge ports 'to distribute fuel from said mouth over the fire.

7. In combination with a furnace having a firebox provided with a grate, an upwardly inclined fuel conduit entering the box, said inclined conduit extending through the plane of the back wall of the fire box and having a substantial portion above the bottom of the fire box at the point where it passes the-plane of the bacli wall, fuel advancing means within the conduit, an upward extension of the conduit within the firebox and extending 7.

above the normal level of the firebed on the -grate and having a flaring mouth, means at the upward turn of the conduit for preventing rotative movement of the fuel, and a steam .nozz'le located above the mouth and within the area thereof and having forwardly and laterally directeddischarge ports 8. In combination with a furnace having a firebox provided with a grate, an upwardly inclined fuel conduit entering the box, said inclined conduit extending through the plane of the back wall of the fire box and having a substantial portion above the bottom of the fire box at the point where itpasses the plane of the back wall, fuel advancing means withthe upwardly directed end of a conveyor tube in position to receive fuel therefrom and guide it upward, means carried by said member for preventing rotation of the fuel passing therethrough, and means on said member for receiving a distributor head positioned in the path of the fuel rising through said ring. 1

10. The combination with a firebox, of a fuel deliveryconduit having an upwardly inclined forward section'terminating in a single relatively short upturned flaring tubular delivery mouth portion in communication with said firebox, the length of the central vertical axis ofthe mouth portion from its v point of intersection with the axis of the rearward inclined conduit portion to the delivery opening being not greater than the height of said point above the lower end of the axis of said inclined conduit portion, distributing means at the delivery end of said mouth porition, and screw means for advancing fuel through said conduit, the forward delivery end of said screw means terminating in the immediate vicinity of the base of said mouth portion for supplying a stream of fuel in loose form thereto, said mouth portion and the terminus of said screw means so related that the fuel rises from the delivery end of said screw means through said mouth portion in loosely divided segregated form into the path of said distributing means, and said last named means acting against thefuel as it rises above said mouth portion to project it over the fire. w 4

11. The combination with a firebox, of a fuel delivery conduit having an upwardly thereto, said mouth portion and the terminus of said screw meansso related that the fuel rises from the delivery end of said screw means through said mouth portion in loosely divided segregated from, and distrlbuting means at the delivery end of the mouth por tion arranged to proJect the fuel over the fire.

FRANK P. ROESGH; ANDREW M. HUNT.

Int

inclined forward section terminating in a single relatively short upturned flaring tubular delivery mouth portion in communication with said firebox, the length of the central vertical axis of the mouthportion from its point of inter-section with the axis of the rearward inclined conduit portion to the delivery opening being not greater than the

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