US218541A - Improvement in apparatus for regulating the supply of steam to steam-engines - Google Patents

Description

2 Sheets- Sheet 1. J. B. G. KOCH 8v F. W. DURHAM. Apparatus for Regulating the Supply of Steam to Steam-Engines.

No. 218,541. Patented Au 12,1879.

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N. PETERS, PHOTO-UTHUGRAPNER. WASHINGTON. D C4 2 Sheets-Sheet 2. J. E. C. KOCH 8v P. W. DURHAM. Apparatus for Regulating the Supply of Steam to Steam-Engines. No. 218,541. Patented Aug. 12,1879.

n. PEIERS. PHOTO-UTHCGRAPMER, WASHINGTON, D C

yNTTED STATES PATENT OEEIcE.

JOHN E. C. .KOCH, OF SOUTH KENSINGTON, COUNTY OF MIDDLESEX, AND

FREDERICK W. DURHAM, OF NEW BARNET, COUNTY OF HERTS, ENGLAND.

IMPROVEMENT IN APPARATUS FOR REGULATING THE SUPPLY 0F STEAM T0 STEAM-ENGINES.

Specification forming part of Letters Patent No. 218,541, dated August 1'2, 1879; application filed October 28, 1878; patented in England, February 27, 1877.

. in the county of Herts, England, have invented an Improvement in Apparatus for Regulating the Supply of Steam to Steam-Engines and do hereby declare that the following description,

taken in connect-ion with the accompanying drawings, hereinafter referred to, forms a full and exact specification of the same, wherein we have set forth the nature and principles of our said improvement, by which our invention may be distinguished fromothers of a similar class, together with such parts as we claim and desire to secure by Letters Patentf-th at is to say:

In large steam-engines it frequentlyr requires so much power to move the throttle or other valve in the steam-pipe in Vorder to regulate the supply of steam that an ordinary governor cannot be employed for this purpose unless it is made very powerful, in which case 1t is not -sufciently sensitive to act efficiently under slight or sudden variations of speed.

Our invention relates to means for effecting the regulation of the steam-supply in such cases by the use of a comparatively small and sensitive governor, as we will now describe.

For this purpose, instead of connecting the governor directly to the regulating-valve, as is usually done, we connect it to the slide-valve of a small subsidiary steam-cylinder, the piston or plungerof which we connect to the main regulating-valve of the engine. Thus the governor needs only to have sufficient power to move the slide of the small cylinder, so as to admit steam thereto, and the piston of this cylinder acts with the force necessary for operating the regulating-valve.

In order that the manner in which our invention can be carried into practical operation may be the better understood, we have shown in the accompanying drawings our mode of applying for this purpose a governor of known kind, whose action depends on the resistance of liquid to a paddle-wheel revolving therein, as described in the speciication of Letters Patent granted to me, the said F. W. Durham,

and to Henry Howse, on the 27th of March, 1877, No. 188,876.

Figurel represents a longitudinal section, and Fig. 2 a front view, of regulating apparatus according to our present invention applied to the working of a throttle-valve in a steam-pipe, Fig. 3 being a part plan, showing the gearing of the governor. Fig. 4t is a vertical section, showing the modification of the apparatus which we employ when the regulation of the steam-supply is effected by a shutoff valve.

A is a spindle, which may be worked by gearing or by a belt and pulley from the main shaft of the engine, being speeded thereto in any desired proportion. On this 'spindle is fixed a bevel-wheel, c, gearing with two vbevelwheels, b, mounted on a block xed on a second spindle, B, which is in line with, but loose from, the spindle A.

The spindle B passes through a sleeve, C, on which are fixed two bevel-wheels, the one of which, c, gears with the wheels b, and the other c Gears with a bevel-wheel d on anl upright spindle, D. On the spindle D is fixed a paddle-wheel, E, within a casing, F, containing water or other liquid, the said casing having tixed blades j', projecting inwardly from its sides, to prevent the liquid from acquiring a continuous rotary motion. The spindle B, continued forward, has liXed on it a pulley, G, connected by a chain, g, with a helical spring, H, the face of which can be adjusted by a screw, h. On the spindleB there is also xed a pinion, K, which gears with a rack on the rod la of the slide of a subsidiary cylinder, L, which is supplied with steam from the main steam-pipe. The piston-rod l from the cylinder L is connected to the lever of the throttlevalve M, either directly, asV shown in the drawings, or it may be through suitable levers and rods when necessary.

The action of the apparatus is as follows: The spindle A, being caused to rotate, acts through the bevel-gearing a., b, c, c', and d, causing the paddle-wheel E to rotate in the liquid in F. When, owing to excess of speed, the resistance to the rotation of E exceeds the force of the spring H, then the bevelwheels b are caused to revolve partly round the wheel e, as planet-wheels round a sun-wheel, and thus the spindle B is partly turned in opposition to the spring H. The partial rotation of B and of its pinion K moves the slide-rod k and the slide attached to it, whereby steam is admitted into the cylinder L, to act on its piston, giving it such movement as to close, or partly close, the throttle-valve M, and so reduce the supply ot" steam to the main engine. When, in consequence ot' the reduction ot' supply, the speed of the engine becomes again moderated, the resistance to the paddle-wheel E becomes lcssened,and the spring II,aeting by the chain g on the pulley G, causes the spindle B to turn backward, and the sliderod k to be thereby moved back, so as to cut ofi" or reverse the supply to the cylinder L, the throttlevalve M heilig thus caused to remain where it had been previously set or to reopen.

Instead of the bevel sun-aiul-planet gear shown in Figs. 1, 2, and 8, spur sun-aiul-planet gear may be employed t'or the governor, as shown by the side elevation, Fig. 3^. According t0 this arrangement, a pulley or wheel, N, having internal cogs isdriven by straporother wise from the engine. lt revolves loosely on the shaft of the governorpaddle, and its teeth gear with those ot' a pinion, p, which gears with a pinion, r, fixed on the shai't ot' the governor-paddle, which revolves within the casin g F. The intermediate pinion, p, is mounted on e a lever, 1)whioh is linked to thesliderod k,

and also to an adjustable spring, S. The piston-rod l is linked, as bet'ore described, to the lever of the throttle-val ve M. By means ot' a hand screw-wheel the spring S is adjusted to such force that the lever P is held stationary while the motion of N is conveyed through the pinion p to the pinion r and the paddle ot' the governor, 'causing it to revolve in the liquid within the casing. Should the engine-speed vary, then, the resistance of the paddle being correspondingly varied, the lever l is caused to move downward or upward, as the case may be, thereby moving the slide attached to k, and so determining the passage of steam to and from the cylinder L to act on the pistou in that cylinder, and thereby alter the position ot' the throttle-valvcM in the main steampipe.

A shutoff valve may be employed for regulation of the supply, as shown iu Fig. 4. In this case the cylinder L is fitted with a piston somewhat lai-ger in area than the valve N,and is supplied with steam, bythe pipe 0, from the main steam-pipe. The slide-rod k being worked, as described, by a governor, steam is either admitted to or allowed to escape from the cylinder L, according` as the speed of the engine is increased or diminished, and the valve N is thereby more or less closed or per mitted to open.

Having thus described the nature of' our invention, and the best means we know of carrynig it. into practical operation, we claim- The combination of the shaft A, carrying a belt-pulley and bevel-wheel, a, shaft B, carrying the block and bevel-wheels b b, the sleeve (l, carrying bevelwheels c c', paddle-wheel E, the shaft of which carries bevel-Wheel d, the adjustable spring for regulating the movement ot' shaft Il, the cylinder L, having its slidc valve connected with said shaft, and its piston-rod adapted for connection with the throttle-valve of a steanrengine, substantially kas described.

In testimony whereof we have signed our names to this specification, in the presence of two subscribing witnesses, this 5th day ot' 0c tober, 1878.

JOHN EDWARD CAMPBELL KOCH. FREDERICK WILLIAM DURIIAM.

Witnesses:

ALBERT C. (l. HENRY, JNo. P. M. MILLARD.

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