US1578016A - Mechanical stoker - Google Patents

Description

.INVENTO s [ad rk/75M ATTORNEYS 4 Sheets-Sheet 1 March Z3 1926. A

c. s. DAvY ET AL MECHANICAL STOKER Filed July', 1921 C. S. DAVY ET AL March 23 1926.

MECHANICAL STOKER Filed July 6, 1921 4 Sheets-Sheet 2 INvE ToRs BY I 6701/ @641/ M /m/ATTORNEYS v 1,578,016 c; s. DAvY ETIAL A March 23 1926 MECHANICAL STOKER 4 Sheets-Sheet B Filed July 6, 1921 March 23, 1926.

- v c. s. DAvY ET AL MECHANICAL STOKER Filed July', 1921 V 4 Sheets-Sheet 4 ATToRNl-:Y

iatented Mar. 23, i926.

UNITED STATES PATENT OFFICE.

CHRISTOPHER SAMUEL DAVY, OF DULWIGH, AND ARTHUR SPYER, OF LONDON, ENG- LAND, ASSIGNORS T0 THE BABCOCK @t WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY. i

MECHANICAL STOKER.

Application filed July 6,

T0 all whom it may concern:

Be it known that we, CHRISTOPHER SAM- URL Davy and ARTHUR SPYER, subjects of the King of Great Britain, and residing at 162. Rosendale Road, Dulwich, London, S. E. 21, England, and 14 Clarendon Court., Maida Vale, London, England, respectively. have invented certain new and .useful Improvements in Mechanical Stokers, of which the following is a specification.

This invention relates to improvements in and connected with mechanical stokers, and has for its object to improve the emciency of a furnace fitted with such stokers by providing it with a simple and reliable means for effecting acontrolied pressure air supply, and with mechanical means adapted, while the pressure air supply is in operation, to deal with the fuel riddlings and waste ash, the arrangement preferably being such that the grate may be run simultaneously on natural draught, if required.

The invention is illustrated in the accompanying drawings in which Fig. lv is a llongitudinal section, Fig. 2 a cross section and Fig. 3 a plan showing the apparatus applied to a chain grate stoker of the Babcock & lVilcoX type, a part of the chain being removed, and Fig. 4 is a longitudinal section of a modified form of apparatus.

In the arrangement shown in Figs. 1, 2, and 3, the apparatus is disposed between the Aupper and lower runs of the revolving chain of the mechanical stoker, while in the arrangement shown in Fig. 4, part of the apparat-us is disposed between the runs of the revolving chain, and part disposed on the outside of the bottom and front portion of the revolving chain.

Referring to the drawings, it will be seen that a plurality of chambers or compartments A for distributing the air under pressure, are provided. but there may be only one chamber, or one chamber may be divided into as many chambers as thought necessary, according to the installation. The air under pressure is supplied from the main trunk A4, through branches A3, all of which have openings A2 into the chambers A. The branches A3 are fitted with dampers A5 to regulate the air pressure in the chambers A. After the air is supplied to chambers A the air distributes itself to the underside of the valve member C is preferably provided with a plurality of radial vanes, here illustrated as four in number, so arranged that two opposite vanes always engage the valve seat, thereby always maintaining the air chamber or chambers sealed. Valve C is driven nie-- chanically by means of a rotating shaft C from a geared wheel C4, the latter being driven by the geared wheel D1, which Ais rotated by a countershaft D, the countershaft D being driven from the front chain grate, driving shaft E by means of bevel wheels El and D2. The force of the entering air carries the riddlings transversely over the plate A13, located above the lower run of Vthe chain to the rotary discharge member which is sealed against said plate. The riddlings are thus collected in the pockets formed between the vanes of the rotary member which discharges them through the opening C2, from which they are deposited on the lower run of the chain and either sift therethrough or are carried to the forward end of the grate where the surface of the chain is broken thereby forming openings between adjacent links in passing over the front sprocket wheels, forming openings through which the residual riddlings fall.

The valve may be fitted either parallel to the axis of the chambers A, as in Figs. l and 2, or transverse thereto as in Fig. 4.

In Fig. 4 is shown an alternative arrangement of pressure draught and riddling deposit apparatus, part of which is placed within the revolving chain grate B, and part below the bottom and front side of chain grate B.

In this figure only one pressure air chamber Al is shown, but this may be divided into several compartments, and the high pressure air supply may enter into the said chambers by any suitable place or places., according to the installation required.

To render air chamber Al suitable tor high pressure air draught, and at the same time to deal with the riddlings and waste ash, sealing plates A7 and A8 are arranged behind the iront driving shaft and in front oi"A the rear shaft. A plate A9, disposed below the underside ot chain B oi the Stoker, is connected up by plates A19 and A11 and a door A12 to the stoker hopper, the door being placed at the front for inspection, or for running on natural draught. Vln the form shown in Fig. l, the riddlings pass through the lower run ot the chain grate and are carried along on the plate A9 until they are discharged into the valves C5.

To the plates A7 and A9 are attached the plates F and F', which lie on the upper side orn the bottom portion of the chain B, thereby eifecting an air seal with the bottom plate A9.

rThe pressure air supply chamber A delivers and distributes its air equally through the openings AG into the fuel bed which is carried on the up 3er surface ot the chain The plate A9 serves a further purpose, viz, to divide and deliver the riddlings from the waste ashes which tall through the chain grate, while the latter is in operation, to their respective destinations. For this purpose the plate A9 is divided into three parts, to which are i' vVed two revolving valves C9 adapted to be driven from the driving shaft of the chain grate stoker.

The plate A9 with its valve C5 at the rear of the stoker collects and delivers ash through the valve U5 into the ash-pit G. The center plate A9 collects all the riddlings which drop through the grate B and are carried forward by the bottom chain B until they reach the front valve C5, where they are delivered by said valve C5 into the riddling pit l-l, 'trom which they are carried back for retiring onto the stoker.

What we claim and desire to secure by Letters Patent of the United States is l. In combination, a chain grate Stoker, a compartment associated therewith communicating with the under side of the upper run oit' said vchain grate, means for supplying air under pressure to said compartment, and a discharge member associated with said compartment constructed and arranged to discharge riddlings therefrom and maintain the compartment sealed during operation.

2. In combination, a chain grate stoker, a compartment associated therewith communicating with the under side of the upper run of said chain grate, means for supplying air under pressure to said compartment, and a discharge member associated with said compartment and actuated by the gratedriving mechanism for discharging riddlings trom said compartment and constructed and arranged to maintain the said compartment sealed during normal operation.

3. 1n combination, a chain grate stoker, a compartment associated therewith communicating with the under side of the upper run ot said chain grate, means for supplying air under pressure to said compartment, and a rotary discharge member associated with said compartment for discharging riddlings therefrom, and constructed and arranged to maintain said compartment sealed during operation ot' said member.

4. In combination, chain grate Stoker, a compartment associated therewith communicating with the under side of the upper run of said chain grate, means Jfor supplying air-under pressure to said compartment, a valve member comprising a rotary valve actuated by the grate-driving mechanism and provided with a plurality of radial vanes, and a valve seat for said valve provided with discharge openings for discharging riddlings from said chain grate, the valve member being constructed and arranged so that opposite vanes always engage said valve seat to maintain said compartment sealed.

5. In combination, a chain grate Stoker, a compartment located between the upper and lower runs of said stoker and communicating with the lower side of the upper run, means tor supplying air under pressure tosaid compartment, and a discharge member associated with said compartment constructed and arranged to discharge riddlings therektrom and maintain the compartment sealed during operation.

6. In combination, a chain grate Stoker, a compartment located between the upper and lower runs oi' said stoker and communicating with the lower side of the upper run, means for supplying air under pressure to said compartment, a discharge member located at one side of said compartment sealed during normal operation and constructed and arranged to discharge riddlings from said compartment and maintain the compartment sealed during operation, and means for admitting air under pressure to the side of said compartment opposite said discharge member.

7. 1n combination, a chain grate stoker, a compartment located between the upper and lower runs of said stoker and communicating with the lower side or" the upper run and comprising a plate located above the lower run of the chain grate, means for supplying air under pressure at one side of said compartment and grate, a discharge member located at the other side of said grate extending longitudinally thereof and sealed against said plate, said member vbeing constructed and arranged to discharge riddlings from said compartment and at the same time maintain said compartment sealed during operation.

8. In combination, a chain grate Stoker, a compartment located between the upper and lower runs of said stolzer and communicating with the lower side of the upper run and comprising a plate located above the lower run of the chain grate, means for supplying air under pressure at one side of said compartment and grate, a rotary discharge member llocated at the other side of said grate extending longitudinally thereof and sealed against said plate, said member being constructed and arranged to discharge riddlings from said compartment and at the same time maintain said compartment sealed during operation. a

In testimony whereof We have hereunto signed our names.

CHRISTOPHER SAMUEL DAVY. ARTHUR SPYER.

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