US1952720A - Locomotive stoker - Google Patents

Description

H. E. LIPPERT LocoMoiIvE STOKER March 27, 1934.

Original Filed Jan- 11, 1929 R r @K m WWW S 161 V w m \w 9 W Q I M w E c c .v\ WW 9 m .h\ N v N\ M, m V w a h, -H w\ Q m Q z Patented Mar. 27, 1934 PATENT OFFICE v I 1,952,720 LOCOMOTIVE STOKER Henry E. Lippert, Pittsburgh, Pa., assignor, by mesne assignments, to The Standard Stoker Company, Incorporated, a corporation of Delaware , Application January 11,

1929, Serial No. 331,755

Renewed September 16, 1933 4Claims. (01. 110-101) This invention relates to mechanical stokers for locomotives or other steam generating devices of the type that transfers the coal by a screw conveyor from the tender to the firing opening of the firebox.

The main object of the invention is the provision of novel means in a stoker of the type specified for distributing coal evenlyover the locomotive firebox.

Other objects and advantages of the invention -will appear from the following description and appended claims, taken in connection with the accompanying drawing, in which Fig. l is a vertical part sectional view taken on the center-line of the locomotive, the tender, and the invention; showing the invention as applied thereon.

Fig. .2 is a cross-sectional view taken on line 2-2 of Figure 1 and illustrates the distributing apparatus of. .the stoker.

This invention pertains particularly to the section of a stoker secured on the locomotive, but for the purpose of rendering the invention more clear, especially to those not skilled in the art, I will describe briefly the path of the coal from the tender to the firebox.

In Figure 1 the numeral 1 represents the tender unit or trough of the stoker, which is movably mounted in the tender 2. The trough 1 is connected at its forward end to the fixed inclined section 3 by the ball joint 4. The rollers 5, on the trough 1, rest on the tracks 6 and permit the trough 1 to move longitudinally in the tender 2 when the locomotive and tender travel on curves and cross-overs. The ball joint 4 allows for angular movement between the locomotive and tender as they travel on curves, cross-overs, and turn tables.

The run-of-mine coal falls by gravity from the coal bunker '7 into the trough 1, where a conveying screw 8 (which is driven from its rear end in the Well-known manner, not shown here) carries it forward. to an inclined conveyer screw comprising the screw sections 9 and 10 in the inclined section 3 which deliver the coal to the firedoor opening 11. The inclined screws 9 and 10 are connected to each other and to the conveying screw 8 by the universal joints 12 and 13 respectively. By providing a plurality of screws in the inclined section ,3, as shown, the angle of the universal joint 13 is greatly reduced from the angle that would exist if only one screw were employed. If a single screw were used the inclined section 3 would protrude through the cab deck 14 further rearward than that shown. Thus I have a continuous uninterrupted fiow of coal from the tender to the distributing table 15. As the coal falls over the edge or distributor head portion 16 0f the inclined section 3, the pressure fluid jet openings 17 distribute the coal evenly to all parts of the firebed. The curved ribs 18 catch a portion of the fuel thrown by the jets and divert it into the rear corners of the firebed; The fluid jet openings 17 are in connection with the cored passage 19. The cored passage 19 has suitable pipe and valve connections (not shown) for regulating the pressure of the fluid from the jet openings.

The inclined section 3 is held in position and rigidly secured to the locomotive frame 20 by a suitable support 21. The forward end 22 of the inclined section 3 moves telescopically in the 'firedoor opening 11 as the backhead 23 expands and contracts. A draft ring 24 is fitted around the forward end 22 of the inclined section 3 and is secured to the backhead 23 by the bolts 32. The purpose of the draft ring 24 is to make a seal with the inclined section 3 so there will be no back discharge of smoke from the fire box into the locomotive cab. The draft ring 24 is closed at the top and sides by the flanges 25, 26, and 27, respectively, but is open at the bottom 28 for the admission of air to cool the distributing table 15.

In a stoker where the coal is delivered through the firedoor by a screw or by jets located to the rear of the firedoor there is apt to be much wearing on the side sheets forming the firedoor opening by the coal rubbing on the sheets while passing. To prevent this 1 use protecting flanges 29, one on each side, which keep the coal from com- 1 ing in contact with the backhead 23. These protecting flanges are secured to the draft ring 24 by the studs 30. The protecting flanges also serve as supports for the distributing table 15 which is secured to the protecting flanges 29 by the; studs 31.

It has been proven by experience that coal does not discharge evenly in all directions from the end of a conveying screw. That is, the bulk of the coal will be delivered to the side to which the conveying screw turns from the bottom of the conveying tube.

To overcome this disadvantage and thus carry out the main object of the invention, it will be noted in Figure 2 that the end of the screw 10 is offset a predetermined distance A from the center-line of the firedoor so that substantially the same volume of coal is delivered to each side of the distributing table. The aforesaid center line of the firedoor is on the vertical median plane iii) of the firebox, which plane passes medially through the distributing table 15 and the transverse series of jet openings 17. This relation of the parts serves to equalize the delivery of the coal from the screw 10 to the table 15 in front of the jet openings 17.

The surface of the inclined section 3, between the letters B and C, which is directly ahead of the screw 10 and in the rear of the jets 1'7, is convex so that the discharging coal will spread out and fall over the full length of the edge 16.

From the foregoing description it will be seen that I have invented a stoker that will occupy very little room in the locomotive cab, that will occupy a very small part of the locomotive cab deck and also convey coal continuously from the tender direct to the firebox with a conveyor screw.

I claim:

1. In combination, a firebox having an upright wall provided with a firing opening, a stoker conduit disposed in an inclined position externally of the firebox and having its outlet end in communication with said firing opening, a distributing table at said firing opening extending inwardly from said conduit, a distributor head associated with said table provided with a transverse series of pressure fluid jet openings, and a screw conveyor in said conduit having its discharge end terminating adjacent the outlet end of the conduit, said discharge end of the screw being offset to one side of the vertical median plane bisecting said transverse series of jet openings.

2. In combination, a firebox having an upright wall provided with a firing opening, a stoker conduit disposed in an inclined position externally of the firebox and having its outlet end in communication with said firing opening, a distributor table at said firing opening extending inwardly from said conduit, a distributor head associated with said table provided with a series of pressure fiuid jet openings arranged on opposite sides of the vertical median plane of the distributing table, and a screw conveyor in said conduit having its discharge end terminating adjacent the outlet end of the conduit, said discharge end of the screw being offset to one side of the said vertical median plane of the distributing table.

3. In combination, a firebox having an upright wall provided with a firing opening, a stoker conduit disposed in an inclined position externally of the firebox and having its outlet end in communication with said firing opening, a distributing table at said firing opening extending inwardly from said conduit, a distributor head associated with said table provided with a series of pressure fiuid jet openings spaced equally on opposite sides of the vertical median plane of the distributing table, and a screw conveyor in said conduit having its discharge end terminating adjacent the outlet end of the conduit, said discharge end of the screw being offset to one side of the said vertical median plane of the distributing table.

4. In combination, a locomotive firebox having a backwall with a firing opening therein disposed equally on opposite sides of the vertical median plane of the firebox, a stoker conduit disposed in an inclined position externally of the firebox and having its outlet end in communication with said firing opening, a medially disposed distributing table at said firing opening extending inwardly from said conduit, a distributor head associated with said table provided with a series of pressure fiuid jet openings spaced equally on opposite sides of the vertical median plane of the firebox, and a screw conveyor in said conduit having its discharge end terminating adjacent the outlet end of the conduit, said discharge end of the screw being oifset to one side of the said vertical median plane of the firebox.

HENRY E. LIPPERT.

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