US690620A - Telescopic compound engine. - Google Patents

Description

No. 690,020. Pientd' 1an. '7. |902'.-

w. SCHNEIDER. 'I 'ELESGDPIG CUMPOUND ENGINE.

(Appliation Bled Har. 14, 1901.)

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" Patented 1an. 7, |002.-

W. SCHNEIDER... TELEs'coPlc commun-0. ENGINE.,

(Applicsfton led Mar. 14, 1901.)

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(N0 Model.)

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. Patentedlan. 7, |902.

w.v SCHNEIDER.. r'I'ELESHIFII 'CIDMPUND ENGINE.y

z-(Applicgtiomrled ma 14, 1901'.)

(No Model.)

UNITED STATES PATENT OEEICE.

WILLIAM SCHNEIDER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WHITFIELD COMPANY, OF MEMPHIS, TENNESSEE, A CORPORATION OF MISSISSIPPI.

TELESCOPIC COM POUND ENGINE.

SPECIFICATION forming part of Letters Patent N o. 690,620, dated. January 7,- 1902. Application tiled Marchkll, i901. Serial No. 51,171. (No model.) i

To all whom, it' may concern.-

Beit known that I, WILLEM SCHNEIDER, a citizen of the United States, residing at Chicago, county of Cook, and State of Illinois, have invented certainv new and Vuseful Improvements in Telescopic Compound Engines; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters and iigures of reference marked thereon, which'form a part of this specification.

This invention has relation to that type of telescopic compound engine which comprises a low-pressure cylinder, a stationary abutment, and a high-pressure cylinder working in said low-pressure cylinder and on said abutment, the inner head of said'hig'h-pres-v sure cylinder constituting the differential piston of the engine.

My invention has for its object to so con-A struct the engine as to reduce the loss of steam and power by condensation and back pressure to a minimum, thereby correspondingly increasing the-efficiency of the engine and proportionally reducing the cost of operating the same. v

The invention has for -its further object improvements in the valve mechanism and in the means for operating the valves. Y

These objects I attain in the manner and by the means as hereinafter fully described and as illustrated in the accompanying drawings, in Which- Figures l and 2 are vertical sections ot' a vertical compound telescopic engine embodying my improvements. Fig. 3 is a section lof 4o Pthe combined steam-chest and valve-casing,

taken on line w of Figs. 1 and 2. Fig. 4 isY a section ot the same, taken on line fy y of Fig. 2; `and Figs. 5 and 6 are enlarged side elevation and plan views, respectively, of the connections between the valve-rods and their actuating-rods. I

In Figs. l and 2, Cl indicates the low-pressure cylinder; C, the high-pressure cylinder, (both open at their lower or outer endsg) c,

5o the inner head of the high-pressureY cylinder and differential piston of the engine, and Av the stationaryjabutment. The low-pressure cylinder is bolted to a suitable frame F, provided with the bearings for the crank-shaft S, to which frame isalso bolted a tubular uide c in the extension of said lowressure g cylinder, in which guide reciprocates the high= pressure vcylinderC,'provided with bearings c2 for the pins on the cross'fhead, to which one end of the connecting-rod R is connected, the other end, ofY which rod is connected in the usual manner with the wrist-pin of the crank on said crank-shaft. Thel upper head h of the low-pressure cylinder has formed therein a steam-chamber h', and the stationary abutment has a similar chamber a', and said abutment is detachably secured to and supported from a combined steam-chest and valve-casing D, hereinafter referred to as the valve- .casing secured to the 4head of the low-pres-` sure cylinder and arranged axially therein and extending through the diierential piston c. In practice the connection between the abutment A and valve-casing D and the connection between the latter and the low-pressure cylinder-head are made by screw-joints, though any other means for detachably connecting said parts may be resortedto. Near its upper and lower 'ends the valve-casing is constructed in cross-section as shown in Fig. 3,the steam-passages 6 communicating with the steam-chamber h in the head h of the y low-pressure cylinder and the chamber a in the abutment A, and between the passages 6, near the upper endpf the casing D, are formed ports 2",similar ports 3 being formed between the passages 6, near the lower end of said casing, said passages at the latter end of the casing communicating, as above stated, with the abutment-chamber a through ports a. The passages 2"' (shown in cross-section, Fig. 3) between live-steam passages 6` serve to communicate ports 2" with ports 2' andalso ports 2' with exhaust-ports 2. ThevalvecasingD, between the parts in which passages 6 are formed, is constructedin cross-section as shown in Fig. 4, the two concentric tubes forming between them an annular steamiff chamber d, and the inner tube or valve-casingd proper Ahas ports 4 in communication with said steam-chamber and auxiliary ports 2, adapted to be placed in communication with ports 2. v

On the low-pressure cylinder is mounted a casing B, provided with a live-steam passage b' for connection in any Well-known manner with the source of live-steam supply and with an exhaust-passage b, which may be open to the atmosphere or connected With a condenser. The passage b' is in communication with the chamber h in the head of the lowpressure cylinder O', and at its lower end the casing B is of increased diameter to form an annular exhaust-chamber b2, in communication with passage b and in communication with the low-pressure cylinder through exhaust-ports 5. The bolt-ange of the lowpressure-cylinder head h has a pipe-coupling h2, in line with exhaust-passage l), and to the said cylinder-head h is bolted an exhaustcasing K, having a passage or pipe 7c bolted to pipe-coupling h2, said casing being provided on its under side with suitable flanges, so as to form a dead-air chamber 71;' between casing K and head h. The casing K has a circular opening in line with and of greater diameter than the valve-casing D, so that the latter after being unscrewed from abutment A and from the head h ot the low-pressure cylinder may be readily removed. To casing K is bolted a jacketing-casing J, which has a circular countersunk or depressed portion j', that serves as a closure for the opening in casing K, and said casing J carries the standards s for the rock-shaft, to which the valverods are connected.

From the description ot' the general construction of the engine it will readily be seen that the valve-casing and the high and low pressure cylinders are steam-jacketed in the most effectual manner, and owing tothe fact that the valve-casing is complet-ely surrounded by live steam during the operation of the engine the temperature of the low-pressure steam instead of being reduced is materially increased, so that condensation of steam, whether of high pressure or low pressure, is eiectually reduced to a minimum.

The exhaust-chamber bz has a drainageopening b3, which is normally closed by a drain-cock. (Not shown.)

Referring 110W to the valve mechanism which controls the operation of theengine, fu' indicates the valve that controls the admission of live steam to the high-pressure cylinder and hereinafter referred to as the distributing-valve, and r indicates the exhaust- Avalve, that controls the exhaust from both high and low pressure cylinders, both valves being tubular, as shown, and o2 is the lower head for said valves, which closes the lower end of the valve-casing steam-tight. The distributing-valve o has a contracted or reduced portion, forming with the valve-casing an annular live-steam chamber 4, adapted to communicate with the steam-chestd through ports 4, above referred to. The exhaust-valve o has secured thereto, so as to move therewith, the lower valve-head o2 by means of two or preferably three rods r4, and said valve is secured to a tubular valve-rod r3, guided in a bearingj, formed on the partjl of casing J. The valve-rod r3 extends through and moves with a cross-headf, guided in guides l7'2 on casing J, and said cross-head has journalsf connected to the ends of the arms of a bifurcated lever L, Whose bearing-sleeve or long hub L is loosely mounted on a shaft H, having its bearings in standards s on casing J. The hub L of lever L has a radial arm L2, connected by ball-and-socket joint with the connecting-rod r', that connects the said tubular Valve-rod r3 with the eccentric E on crank-shaft E. (See Figs. 5 and 6.) Through the connections described the exhaust-valve and valve-head o2 move in unison in the inner tube d' ot' the Valve-casing D.

The distributing-valve u is secured to a valve-rod r2, that extends through the aforementioned tubular valve-rod and has motion independently thereof, said valve-rod r2 having secured to its upper end a journalblock provided with radial arms S, connected by links N to arms O of a bifurcated lever O, having hubs or bearing-sleeves O2 loosely mounted on shaft Il on opposite sides of the hub L of lever L. The lever O has a U-arm O3, connected by ball-and-socket joint with the con necting-rod r, which latter is connected to eccentric E on engine-shaft S. (See Figs. 5 and 6.) The eccentric E is controlled by a suitable governing device, preferably the well-known Rites governor G, mounted on iiy-wheel W, to automatically vary the travel of the distributing-valve and the cutoff according to the speed of the engine.

The operation of the engine is as follows In Fig. l the high-pressure piston-cylinderis shown at the limit of its up or in stroke, steam exhausting from the high-pressure cylinder C into the low-pressure cylinder C not only through ports valve-casing ports 2', and long ports 2", but also direct through said long ports 2", the high-pressure piston-cylinder making its down or ont stroke under exparisien. As the high-pressure piston-cylinder completes its down or out stroke its piston uncovers ports 5, leading to exhaustchamber b2, the distributing-valve c establishes communication between the steamchest (Z and valve-casing d and between the latter and the high-pressure cylinder through ports 3, while the exhaust-valve at the same time uncovers ports 2, allowing steam from low-pressure cylinder to exhaust also through said ports, the valve-casing, and through passage c in exhaust-casing K into exhaustpassage b, as shown in Fig. 2. It will thus be seen that the exhaust from the low-pressure cylinder takes place at both ends thereof simultaneously, and the object of this is to utilize the heat of the exhaust-steam to prevent cooling of the low-pressure cylinder, and consequently to prevent condensation of IDO IIO

. low-pressure stroke a comparatively large volume of steam exhausts through ports 5 before the piston c again covers said ports on the high-pressure stroke. This arrangement of ports 5 and 2 results in attaining a desirable and independent lead in exhausting, irrespective of thelead or lap of the valves. In View of the construction and relative arrangement ofthe valves 'u and o' and valve-head 'v2 it will readily be seen that thevalve-casing d performs the function of receiver.

Having thus describedmy invention, what I claim as new therein, and desire to secure by Letters Patent, is

1. Atelescopic compound engine,`compris ing a low-pressure cylinder, a stationary abutment and a Ahigh pressure piston-cylinder working in said low-pressure cylinder and on said abutment, anexhaust-chamber encompassing oneend of the low-pressure cylinder,

an exhaust-chamber at the opposite end there-- of and ports lleading 'from Lsaid cylinder to,

said exhaust-chambers; in combination with means controlling said ports to cause steam to exhaust into both chambers on the lowpressure stroke of the piston-cylinder, for the purposes set forth.

2. In a telescopic compound engine,the combination with the low-pressure cylinder having a chambered head, a chambered'station ary abut1nent,vthe high-pressure piston-cylinder working in said low-pressure cylinder and on said abutment, and a casing `on the low-pressure cylinder 'having a live-steam chamber in communication with the chamber ment, ports leading from the valve-casing to the high and low pressure j cylinders and valves controlling said ports to canse the engine to work compound, for the purposes set forth.

3. A telescopic compound engine, comprising a low-pressure cylinder,a stationary abutment, a high-pressure piston-cylinder working in said low-pressure cylinder and on said abutment,an exhaust-chamber encompassing one end" of the low-pressure cylinder, anexhaust-chamber at the opposite end thereof,-` an air-chamber between the last-named exhaust-chamber and said low-pressure'cylinder and ports leading therefrom to said exhaust-chambers; in combination with-means controlling said ports to cause steam toexhanst from thelow-pressure cylinder into both exhaust-chambers on the low-pressure stroke,

for the purposesset forth. 1 v

4. In a compound telescopic engine organized as described,.the combination with the high and low pressure cylinders, the stationary abutment, the axiallydisposedvalvecasing provided with ports as described and the steam-chest surrounding said casing and communicating therewithfthrough ports 4; of the valves o o', the valve-head1;2 connected with valve o', a tubular valve-rod to which the latter valve is secured, an eccentric on the crank-shaft connected with said valverod, a second valve rod carrying valve 'u and extending through the aforesaid tubular valve-rod, and an automatic eccentric on aforesaid crank-shaft connected with the rod of valve fu, for the purposes set forth.

5. A steam-engine comprising a low-pressure cylinder having a livesteam-supply chamber connectible with the boiler formedl and casing, and-suitable valves in thelatter controllingsaid ports'and passages, for the purpose set forth.

6. A'steam-engine comprising a low-pressure cylinder, a stationary abutment,'a highpressure cylinder working in said low-pressure cylinder and 1 on said abutment, andi'a valve-casing extending fromI said abutment through the opposite head'of-the low-pressure cylinder; in combination with a jacketed exhaust-chamber on said head having'an opening in line with and of greater diameter than that of said valve-casing, a removable cover for said opening and a distributingvalveV in the valve-casing-whose stem extends sure piston-cylinder Working on said abutment and in said 10W-pressure cylinder, said high-pressure cylinder extended beyond the packing on the abutment; of a tubular guide for the high-pressure cylinder carried by and in extension of the low-pressure cylinder, for the purposes set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

WILLIAM SCHNEIDER.

Witnesses:

J oHN M. WALLACE, O. A. WAoHs.

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