US434704A - Henry davey - Google Patents

Description

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H. DAVEY. PUMPING ENGINE.

No. 434,704. Patented Aug. 19, 1890.

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HENRY DAVEY, OF WESTMINSTER, ENGLAND.

PUMPING-ENGINE.

SPECIFICATION forming part of Letters Patent No. 434,704, dated August 19, 1890.

Application filed January 31, 1890- Serial No. 338,715- (No modal.)

' .To all whom it may concern:

Be it known that I, HENRY DAVEY, a subject of the Queen of Great Britain, residing at No. 3 Princes Street, WVestminster, in the county of Middlesex, England, have invented certain new and useful Improvements in Pumping-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it app ertains to make and use the same.

My invention relates to compound pumping-engines; and it consists of an improved construction, hereinafter fully described, and specifically claimed, in which a pump, an intermediate compensating frame and mechanism, and a compound expansion steam-engine and valve-gear and motor thereof, of novel construction, for operating the main valves are combined, whereby the motion of the engine is so regulated as to produce improved and more beneficial results under like circumstances during the operation. I

In the accompanying drawings, Figure 1 is an elevation of my invention; Fig. 2, a plan view of the same; Fig. 3, a longitudinal vertical central section of the steam-engine proper; Fig. 4, a vertical central section through the cylinders of an auxiliary valve-operating engine; Fig. 5, a horizontal section of the same in the line of its pistons; Fig. 6, a side elevation; Fig. 7, an end elevation of the same; and Fig. 8 is an enlarged detail View of two coupled cut-off valves of the main steam-cylinder.

The letters A A in the drawings represent the pump-barrels; (7.6L, their piston-rods; a at, their connecting-rods; B, an oscillating intermediate compensating frame; 0 C, steamcylinders; 0, their common piston-rodg c', connecting-rod, and D valve-gear-operating engine.

The compensating frame B consists of two parallel disks B, fastened to a shaft N, which latter is hung to the main frame of the ma chine. The said disks are provided with crank pins b b b, of which I) I) operate connecting-rods a a of two pumps A A, and b is operated by the connecting-rod c of the steam-engine. When the crank-pin 1) stands The wrist-pins b of the connecting-rods of the pumps A A and the wrist-pins b of the connecting-rod of the compound steam-engine 0* are so arranged as to increase the lifting-power of the pump A* toward the end of the lifting-stroke. These pins 1) b are fastened to two parallel disks B, having a fulcrum-shaft Z2 hung to a suitable frame X.

The steam-cylinders O O are coupled, andtheir pistons 0 c are fastened to the piston rod 0, which is provided with a cross-head c and the connecting-rod c. The steamways c o of cylinder 0 are provided with conical plug-valves E E, which cut off or open communication with steamways c c c c 0 0 leading to and ending in the valve-seat 0 inside of the steam-chest C The valves E E are ground into their seats in the steamcylinder 0, and are provided with ports 6 e 6 8 respectively. At their small ends they are provided with levers e e respectively, which are coupled to a rod 6 and a connecting-rod e. The connecting-rod e is pivoted to a lever c on a rock-shaft E suitably hung to the frame X. This rock-shaft E receives its motion by means of a lever E and connecting-rod e from an. eccentric-pin e on a disk E fastened to the main rock-shaft 12 Thus the motions of the valves E E coincide with the motions of the steam-engine. Thus by the operation of these valves the stroke of the steam-piston is positively determined by cutting off whatever steam may be admitted through either one of the passages c or 0 at the end of the backward or forward stroke. Such steam is thereby confined in said steam- Ways and economized for the next stroke, and

so confined it also serves as an elastic cush-.

ion, partly balancing the main valve of the engine.

Upon the valve-seat o the main valve F is placed, which is an ordinary slide-valve with lower and upper ports f f and f 3 f and an exhaust port f. The top surface of the main valve serves as a valve-seat f for an expansion or cut-01f valve Gr of ordinary construction. The valve G consists of two forked heads 9 9, having cut-off flanges g 9 which latter slide upon the valve-seat f of the valve F, and are held at a proper distance apart upon the-valve-rod G by means of the forked-heads g g, through which the valverod passes, and also by collars g on the valverod and nuts g screwed to the valve-rod. The main valve F is fastened by means of clamp-nuts f to its valve-stem F, which is passed through said valve.

The cylinder 0 is provided with a steamchest 0 containing a main valve H, having steam-ports h k ]L3 H, exhaust-port 7L5, an upper valve-seat ha, and a cut-off valve 1, consisting of two forked heads 2' t with cut-off flanges 6 1' The fastening of said two valves to their respective valve-stems II and I is effected in a manner similar to that of cylinder 0, viz: The valve His fastened by means of two clamp-nuts hand the valve Iby means 'of collars i and nuts 1?. The valve-stems F and H and those G and I are coupled between the valve-chests C C by the wellknown device or devices, as shown, or by some other suitable device or devices, and while the cut-off valvesG and I are operated from the rock-shaft E by means of a leverarm 9 and connecting-rod g, as seen in Figs. 1 and 2, the valves F and G are operated by a rock-shaft F by means of a lever-arm f and connecting-rod f The rock-shaft F is suitably hung in the frame X and provided with a lever-arm f", which latter is connected by means of a couple of links j to the main piston-rod J of a piston 7' in a steam-cylinder J of the subsidary engine D. This steam-cylinder, which may be operated by water-pressure from the pumpmain or by steam from the boiler, is of ordinary construction, and the valve-rod j of its slide or main valve 9' is extended out and beyond the steam space or way d, and is there provided with two collars 7, which serve as abutments of a tappet K on a piston-rod K of a piston in a small steam-cylinder K of ordinary construction. The valve-rod k of its slide-valve k is connected by means ofa link 10 to a lever L, suitably hung or fulcrumed to an upper frame J of the subsidiary engine D, and this lever is by means of a number of connecting-rods Z Z Z and levers Z Z or other suitable devices connected to a lever-arm c upon the rock-shaft E The main-valve rod j is, above the frame J provided with a mortised head j", into which the end in of ahand-lever M is passed, so that the valve f can be operated by hand in case of an emergency.

Steam is admitted to the valve-chest C of the cylinder 0 from a boiler through a pipeconstructed and operated without these lin in "s.

l vhile the piston-rod c is finishing its stroke the pin e", with its described connections, re-

verses the position of the valve 70, whereby the position of the piston 70 and that of the tappet K are reversed. By means of this operation the tappet K reverses the position of the valve j whereby the position of the piston j and piston-rod J is reversed, and consequently the main valves F H are also reversed. By this construction the said main valves are always operated with a full-stroke, and the fresh steam from the boiler enters the cylinder 0 through afully-opened port. The stroke of the piston-rod c is now limited to its exact extent by the operation of the valves G I E F, as will be seen. The exact or correct length of the stroke of the piston-rod 0 can only be attained by the cut-off valves G I and E F, for the reason that they are directly operated from the rock-shaft b and thus move simultaneously with the pistonrod 0. Thus when the piston-rod c has arrived at the terminus of the stroke the valve G has previously cut off the steam-supply from the valve F, and the opposite valve E or E, as the case may be, has cut off the exhaust, so that the piston c is arrested between two elastic cushions of steam, in which position it remains while the subsidiary engine is reversing the main valves.

It is found that steampumps provided with independent valve-motion, as herein described and shown, cannot be operated with a uniform stroke, and various provisions have been made to avoid unduly prolonged strokes, but at great expense. I therefore provide the main cylinder with an expansion slidevalve operated by the valve-gear-operating engine D, whereby the end portion of the stroke of the main engine is effected with simply expanding steam, thus retarding its speed and greatly reducing the momentum of the engine, and enabling me by closing the steam-passage of the main cylinder by the valves E to stop the motions of the steampistons with greater precision than would be the case if the main cylinder were operated by live steam to the end of the stroke.

What I claim as my invention is 1. The combination of the pump A intermediate compensating beam B, and operating steam-engine 0*, comprising cylinders O C, a subsidiary valve-motor D for operating the main valves of the steam-engine, and the IIt.

directly-operated cut-off Valves GI E E, sub- In testimony whereof I hereunto aifix my stantially as described. signatiire in presence of two Witnesses.

2. The combination of the compound pumping steam-engine 0*, comprising cylinders O HENRY DAVEY 5 O, piston-rod a, piston c 0 valves E E, F G, Witnesses:

and H I, with the subsidiary engine D, sub- ALEXR. CECIL RIDGWAY, stantially as described. W. N.RIDGWAY.'

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