US1441097A - Stoker mechanism - Google Patents

Description

2 SHEETS-SHEET 2 M. P. LAUGHLIN. STOKER MECHANISM. FILED JULY 2 19194 Jan. 2, 1923.

5 Z M o o m r K 5 J. 2 A 7 J x a F 52:

i T all aria-await may concern:

have such an arrangement l atented Jan. 2,

' NYRON P. LAU GHLI'N, OI?

PHILADELPNIA, PENNS LVANIA, ASSIGNOE to AMERICAN or PENNSYLVANIA.

s'roKEnmn'gnamsm.

Application filed 3111372, 1919. Serial No..sos,142.

Beit known that I, MYRON P. LAUGHLIN, a'citizen ofthe tnited States, residing in Philadelphia. Peimsylvania, have invented the Stoker llechanism, of which the following is a specification. 7

One, object of my invention is to provide a novel formbffuel feeding device for an aushall include a fuel liver fuel to the retortofsuch a stoker but shall also cooperate with a piston as a fluid motor developing the power necessary for its operation on the fuel.

Another-object of my invention is to provide a feeding anechanism for mechanical stokers, especially of the inclined underfeed type, which shall be simple, compact and and nstruction of parts as will permit of its being manufactured and operated at agreat-ly reduced cost as compared with similar devices of the same clas sthe invention contemplating a novel motive power'device, one of whose elements shall. also serve as the ram or pusher whereby fuel is intermittently fed from the source thereof to the stoker furnace;

Another object of my invention is to pro vide a novel form of combined ram and motor cylinder designed to cooperate both with a fuel supplying and guiding structure and also with a stationary piston to utilize the power developed by fluid under pressure for delivering fuel to the furnace of a stok'er.w

A further objectof the invention- 18 to J provide a novel form of combined ram and motor cylinder, together "witlra simple and substantial valve mechanism for controlling the flowof motive fluid for said cylinder.

These objects and other advantageous ends I attain as hereinafter set forth, reference being had to the accompanying drawings, in which, v

-Fig; 1 is a vertical section of an inclined underfeed stoker, illustrating my invention as applied thereto Fig. 2 is an end elevation on a larger scale than 1', illustrating the construction of the ram chamber and. part of its associated mechanism; 1

,Figs. 3 and4a're respectively vertical and Fig. 5 is a section on the line 5-5, Fig. 2, illustrating certain details of the valve mechanism v Fig. 6 is a side elevation of the ram chamber showing the valve actuating cylinder and its associated parts; and

Fig. 7 is a longitudinal vertical section of the cylinder and piston for actuating the controlling valve. together with the pilot valve for saidcylinder.

In the above drawings 1-5 represent portions of the frame work of astoker, illustrated as of the inclined underfeed type, having in its furnace 6 any suitable number of sets of tuyeres 7 between each of which sets are retorts 8 ;the tuyeres being supplied with air under pressure from a wind box I in the manner well known in this art and more particularly as found in the Taylor 'stoker.

Below and to the rear of the series of tuyeres T is a stepped grate 9 slidable toward and from the bridge wall 10 well as parallel therewith and between sai wall and the grate is a dumping plate 11 normally supported at a level below said stepped grate by a pawl structure 1:2 whigh may be withdrawn or projected atwill. be agitated, and restored to its normal elevated position after being permitted to drop upon the withdrawal of the pawl, by a suitable power' device such as the motor 13 which is illustrated as a cylinder whose piston is connected through a rod LL and a link 15 to an arm .16. This latter. through a tivelv connected to said dumping plate 11.

For

horizontal sections on the lines 3-3 and This dumping plate may,

delivering fuel to each of the retorts and for feeding it out and down into the furnace, I rovide afuel hopper '20 mounted across tl e front of the stoker and having its lower portion connected todeliver fuel by gravity to a horizontally elongated cylinder 'or ram chamber 21 whose rear end opens into the retort 8.

For forcibly moving the fuel from the' hopper out of the ram chamber 21 into the retort, I provide a ram or pusherdelivered 22 in the form of acylindrical structure reciprocable within, said chamber and in ac shown my invention as applied to a stoker cordance with my invention, this ram itself constitutes the cylinder of a fluid motor, for it-is designed to cooperate with a piston 23 fixed relatively to the fuel receiving chamber 21 within which it is mounted. This piston is connected through a rod or stem 24 with. a plate. 25 constituting the head of the fuel chamber 21 and has the necessary packing rings to prevent leakage of fluid around its edges. 'The front end of the ram 22 has fixed in or to it a head 26 provided with a stuffing box 27 to prevent leakage along the rod 24 and this latter has formed in it two longitudinally extending assages- 28 and 29, of which the first opens on the rear face of the piston 23 so as to be capable of delivering fluid to and exhausting ;it from the rear end of the ram cylinder 22,-. while the second passage 29 opens on the front end of the piston 23 so as to deliver fluid to and ex haust it from the space between said piston and the head-26.

In the-particular case illustrated I have having an auxiliary fuel receiving chamber or cylinder-30 in which a ram of the usual construction is reciprocable by means. of a rod 31, and this latter is actuated from the main ram 22 through a bar 32 constituting a lever fulcrumed' at .33 on a bar 34 pivoted to a fixed portion of the stoker structure at435. The upper arm of saidlever; is pivoted to a lug 36 projecting downwardly from the ram 22 through a slot 37 in the under part of the ram chamber 21 and said lever is pivoted at 38 tothe outer -end of the rod 31 which drives the auxiliary ram. The

"retort 8, but likewise odically supplying motive fluid to *hausting it from the two ends of lower end of the lever 32 is connected through a bar 39 and a rod 40 with the reciprocable grate 9, so that under operating conditions the reciprocation of the main ram 22' in the chamber 21 not only causes fuel to be delivered from the hopper 20 to the causes the ram in the cylinder 30 tobe reciprocated so as to as- SISt in feeding the fuel downwardly and out wardly in said retort. At the'same time the reciprocation. of the grate 9 further feeds the ashes with the partly consumed fuel therewith downwardly onto the dumping plate 11 and also serves to cooperate 'with the bridge wall 10 in crushing any clinkers which may have formed.

. While my invention contemplates the use of any suitable form of valve gear for periand exthe ram cylinder 22, so as to cause this to reciprocate'in the chamber 21 at the desired rate of speed preferably employ the apparatus shown, in which the passages 28 and 29 in the fixed piston rod 24 are extended laterally through the head 25 of said ram chamber 21 so that their outer ends terminate adjacent each other on the edge of said head.

For controlling the delivery of fluid to these passages I mount an elongated structure preferably on'the side of the ram supply pipe to two channels 56 and 57 openlng on the face of the structure 50 in such positions that they respectively com- .municate with the ends of the passages 28 and 29where these terminate on the edge of the head 25. v

F oroperating this main valve 54 I provide the second casing 52 with a piston 58' connected through a rod 59 with said main valve, to this cylinder byva'pilot valve 60 mounted at one side of the structure 50. This valve has its movable element connected to and movable with a rod 61, whose two opposite ends are connected through parallel arms 62 and 63 to the ends of a second rod 64 threaded to receive two adjustable abutments 65 and '66, so positioned as to be engaged by an arm 67 rigidly fixed to and movable with the ram cylinder 22. The arrangement of parts is such that the reciprocation of said cylinder through the arm 67 causes the rod 64 and with it the valve rod 61 to be movedlongitudinally as the ram cylinder 22 approaches either end of its stroke. As a result the pilot valve is so moved as to allow motive fluid to enter one or the other end of the second or relay cylinder 52 and thereby, through the piston 58 and rod 59, shift the main valve 54 at the proper time to cause motive fluid to be delivered to one or the other end of said ram cylinder, which is thereby moved in the ram' chamber to feed successive charges of fuel from the hopper to the retort.

andil control the flow of motive fluid- For regulating the operation of the piston 58 and main valve 54, I connectto the rod 59 a second piston 70 operative in the dash pot casing 53. Oil or other suitable fluid is confined in this cylinder and suitable means, whose detail construction forms no partof the present invention, is provided for regulating the speed at which this fluid may flow from one endjto the other of said casing and hence, the speed at which the pistons 70 and 58 with the valve 54 may tmove in their respective casings or cylinders.

From the above description it will be noted that-I have materiallysimplified and rendered more compact the fuel feeding mechanism for a stoker, since by utilizing the fuel feeding ram as a em enabled to develop the power for propelling the fuel. at the point where it is tobe utilized without requiring it to be transmitted through gearing mechanism. Moreover the stationary pismotor cylinder, I

or other forms of ton may be situated practically under the hopper and the fuel receiving cylinder or ram chamber merely extended forwardly far enough and in such form as to provide a suitable guide for the ram cylinder.

1 claim:

1. A fuel feeding device for a stoker consisting of a fuel source; a retort; a cylinder connecting said fuel source and retort; a hollow fuel pusher operative in the cylinder to act directly on fuel from the source and formed to cut off the source from said cylinder while said pusher is delivering fuel therefrom'to the retort; a relatively stationary piston in the pusher; and means for supplying and controlling the admission and exhaust of motive fluid for the pusher to cause the same to be reciprocated in the cylinder.

2. The. combination in an inclined underthe second cylinder; and valve mechanism for supplying and controlling motive fluid to and its exhaust fro the second cylinder.

3. The combination in a 'stoker feeding mechanism of'a hopper; a cylinder connected to receive fuel from the hopper under the action of gravity; with a double-acting fluid motor having its movable member closely fitting into and reoiprocable in said cylinder and formed to directly engage and discharge therefrom the material entering it from the hopper.

In witness whereof I aflix my signature. MYRON P. LAUGHLIN.

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