US52789A - Improvement in steam-engine governors - Google Patents

Description

and the centerfof the valve.

Unire .Srn'rns ATP- E- AMBROSE LAWRENCE, AND JOHN E. CRANE, OF SAME PLACE.

IMPROVEMENT IN STEAM-ENGINE GOVERNORS.

Speciiication forming part of Letters Patent No. 52,759, dated February 20, 1866.

To all whom it may concern:

Be it known that I, ALVIN LAWRENCE, of Lowell, in the county of Middlesex and State of Massachusetts, have invented a new and Improved Method ot' Operating the Throttle or Cut-ott' Gear of Steam-Engines; and I do hereby declare that the followin gis a full and exact description of the same, reference being had to the accompanying drawings, making a part of this specitication, in which- Figure l is a vertical central section of my invention. Fig. 2 is a plan or top view on the line A B of Fig. l. Fig. 3 is a back view ot' the cylinder, valve-stem, spring', and supplypipe pertaining to the same.

My invention consists in combining and arranging a valve with a cylinder or its equivalent in such a manner that said valve may be operated by the governor and the admission and exhaust ports opened and closed to admit the fluid under pressure 1lnto either end of the cylinder and exhaust the fluid out of either end of the same, as the action ot' the governor may determine.

My invention also consists in the arrangement of a spring secured to any suitable support, and so arranged as to engage with the valve stem or rod and restore said valve to its central position it, by reason of backlash or loss ot' motion in the workin g parts of the governor, said governor should fail to act in time. Said spring isa intended to act a little in ad-v vance of the motion of the governor.

In the drawings, A is the cylinder, provided with a piston-head, B, and a pistou-rod, C, alsoa valve, D, arranged to operate within a valve-chest, E, which communicates with the cylinder A by ports c e2 and passages a a2. The groove o formed in the substance of the valve D is for admission ot' fluid around the said valve to either of the ports c or c2. The grooves .r w provide for the exhaust of iiuid which passes from the cylinder through ports c or c2 and passages a or a2 and openings c c The grooves o c are for packing to prevent the escape of iiuid around the top or bottoln ends ot' the valve.

A supply-pipe, F, enters the back side ot' the valve-chest E, and is provided with a cock, G, by which the quantity of' iiuid admitted to the cylinder may be regulated so as to move the piston fast or slow when the ports c or c2 are opened to receive the said uuid.

The cylinder A maybe iitted and secured to the-bed-plate H, or a separate head may be secured to the lower end of the cylinder. A ball-governor or other suitable device is secured to the bed-plate H, or otherwise conveniently arranged, and the spindle J of the governor, connected with the stem of the valve D by a swivel, h, which rotates in a socket, g, made in the stem of the valve D to receive it. The top end of the swivel-rod enters the lower end of the spindle J of the governor, and is secured thereto by a pin, b.

A spring, K, secured at one end to the substance ofl the valve-chest E and the other end engaged with the stem of the valve D, servesto restore said valve to its central position and perfectly close the ports at both ends of the cylinder before the balls of the governor have fully returned to their normal plane, regardless of backlash or loss of motion in the working parts ot' said governor caused by wear or otherwise.

Motion may be imparted to the governor by a belt running from a pulley on the shaft of the engine to the pulley L of the governor, said pulleys being ot' proper diameters to correspond with the required speed of the engine.

The luid used to operate the piston A may be water, oil, or the equivalent thereof', and the pressure may be that of the boiler which supplies steam for the engine, or it may be the pressure of a tank or reservoir, or any other available pressure, and when my invention is applied to a steam-engine, substantially as herein shown and described, increased speed of the engine causes the balls of the governor to rise and move the spindle J of the governor and the valve D downward a sufficient distance to allow tluid to pass from the supplypipe F around the groove o of the valve D, through the ports c and passage a', into the lower end of the cylinder A,forcing the piston upward to move the lever M or any other device connected with the top of the piston-rod C in one direction, said lever or other device to be connected with the throttle or cut-oli' gear ot' the engine, and when the speed ot the engine is diminished the balls of the governor fall, which raises the spindle J and thevalve D and admits fluid around the groove 0 ot' the valve D through the ports e2 and passage a2 into lthe upper end ot the cylinder A, forcing the piston downward and moving the lever M or other device in the opposite direction, thus operating the throttle or cut-oft' gear with great force and a steady motion.

When an engine having .my invention connected, as speciiied, is ruiming' at its proper speed the balls of the governor revolve in their normal plane and the valve D is in its central position, and both ot` the ports, c and e2, are closed and no ordinary force can move the throttle or cut-oft' gear'in either direction until the speed of the engine is changed.

' In the ordinary process of operating the throttle or cut-oli' gear of steam-engines the spindle of the governor is connected with the throttle or cut-off gear, and when the load npon the engine is increased the balls of the governor fall to open the throttle or adjust the cut-off gear and admit a greater volume of steam to the cylinder to drive the increased load, and when increased load is thrown upon the engine and the balls of the governor fall, asabove stated, the speed ot' the engine is diminished in proportion to the load, for if the engine recovered its speed the balls ofthe f governor would rise and close the throttle and no greater volume of steam would .be admitted to the cylinder withv a heavy load than with a light load, and when a considerable portion ot' the load is thrown ofi' from the engine the speed is increased and the balls of the governor rise and close the throttle or adjust the cut-oft' gear to admit a less volume of steam to the cylinder, and when said load is thrown oil' from the engine and the balls ot' the governor rise, as hereinabove stated, the speed of the engine is increased in proportion, for if the engine returned to its speed the balls of the governor would fall and openthe throttle or adjust the cat-oft1 gear so as to admit the same volume ot' steam for a light load as for a heavy one. In either case, if the engine run at its proper speed, the balls of the governor will revolve in their normal plane, and increasing or diminishing the load upon the engine increases or diminishes the speed ofthe same.

In the use of my invention to operate the throttle or cut-olie gear of steam-engines,when the load upon the engine is increased or diminished the balls of the governor rise or fall, and thereby raise or lower the valve D to open either` of the ports c or e2, as the ease maybe, and admit iiuid into either end of the cylinder A to force the piston upward or downward and open or close the throttle or adjust the cut oft' gear so as to admit a sufficient. volume of steam to drive the said load and allow the engine to resume its proper speed, and when the throttle has been opened or closed or the cutloft' gear adjusted, as above stated, and the engine attains its proper speed, the balls of the governor will resume their central or normal plane, operating the valve D and closing both of the ports e and e2, leaving the throttle open or closed, as the case may be, asuflieient distance, or the eut-off gear properly adjusted to admit the required volume of steam to drive the engine at its proper speed with the load increased or diminished.

When the pressure of steam in the boiler is 'diminished the speed ot' the engine is also diminished and the balls of the governer fall, causingthe throttle to open and admitagreater volume of steam to the cylinder of the engine, thus making upin volume what is lost in pressure, and when the pressure of steam in the boiler is increased the speed ot' the engine is also increased and the balls ot the governor rise, causing the throttle to close, thus decreasing in volume what is gained in pressure, and thereby maintaining uniform speed under varying loads and pressures, which is the object of this invention.

What I claim as new, and desire to secure by Letters Patent, is-

l. The combination and arrangement otl the valve D with the cylinder Aor its equivalent, when the said valve is connected with and operated by the governor, substantially as and for the purpose specified.

2. In conjunction with the cylinder A or its equivalent, the valve-chest E, and valve D, said valve being connected with and operated by the governor, the use and application of fluid under pressure for the purpose of operating the throttles, valves, or cut-off gear ot' steamengines, substantially as specified.

3. In combination with the valve D, the saine being connected with and operated by the governor, the employment of the spring K, or its equivalent, for the purpose set forth.

4. In combination with the cylinder A,valve chest E, and valve D, said valve being connected with and operated by the governor, as above stated, the supply-pipe F and regulatin gcock G, substantially as and for the purpose specified.

5. The general construction and combination of the apparatus, consisting of' the cylinder A, piston-head B, piston-rod (l, and lever M, or its equivalent, thevalve D, valve-chest E, supply-pipe F, regulating-cock G, and the governor, the whole arranged substantially as and for the purpose set forth.

ALVIN LAWRENCE.

In presence ot'- JOHN E. CRANE, S. L. BAILEY.

Images