US728709A - Compound steam-engine. - Google Patents

Description

No. 728,709. PATBNTED MAY 19, 1903.

J. HARDILL.

COMPOUND STEAM ENGINE.

I 7 APPLICATION FILED JULY 14, 1902.

no MODEL. 1 H 2 SHEET8BHEET-1.

aawemfo'a Jse a/ fini GHQ 1142130 PATENTED MAY 19, 1903.

I J. HARDILL. COMPOUND STEAM ENGINE.

APPLICATION FILED JULY 14, I902.

' 2 SHEETS-SEEET 2.

I no MODEL.

UNITED STATES latented May 19, 1903. P TENT OFFICE.

JOSEPH HARDILL, OF MITCHELL, CANADA, ASSIGNOR OF ONE-HALF TO ROBERT BENSON, OF. BUFFALO, NEW YORK.

COMPOUND STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent N o. 728 ,709, dated May 19, 1903. Application filed Jul 14,1902. sesame. 115,516. (No model.)

T0 aZZ whom it may concern.-

Be it known that I, JOSEPH HARDILL, a subject of the King of Great Britain, residing in' the town of Mitchell, in the county of Perth and Dominion of Canada, have invented certain new and useful Improvements in Compound Steam-Engines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inv the art to which it appertains to make and use the same.

This invention relates to compound steamengines of the multiple-cylinder cross-compound type.

The object of the invention is to provide, first, a novel, simple, and effective form of engine of this character, and, second, such an engine which may be made single or double acting compound at will.

With the above and other objects in view, which will readily appear as the nature of .the invention is better understood, said invention consists in certain novel features of construction and combination and arrangement of parts, which will hereinafter be fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is a top plan View of a compound single or double acting engine embodying my invention. Fig. 2 is alongitudinal section of the same. Fig. 31s a cross-section on line YY of Fig. 2. Fig. 4 is a longitudinal section of a double-acting engine embodying the invention. Fig. 5 is a cross-section of the same on line a; no of Fig. 4.

Referring now to Figs. 1, 2, and 3, the numeral 1 represents a high-pressure cylinder, and 2 a low-pressure cylinder, arranged side by side; 3, an intermediate steam-chest;. 4 and 5, high and low pressurepistons working in said cylinders, and 6 a slide-valve working in the chest and adapted to be operated by an eccentric motion (not shown) in the usual way. The high-pressure cylinder 1 is provided with two steam-inlet ports? and 8,.

opening into the center of the steam-chest and communicating with a steam-supply pipe 9 through passages 7 and 8 and branch pipes 10 and 11, having controlling-valves 10 and 11', whereby the flow of steam to either or both ends of each cylinder may be regulated as desired. On opposite sides of inlets 7 and 8 are passages 12 and 13, which connect the opposite ends of said cylinder with the chest 3. The low-pressure cylinder 2 is provided with an exhaust-port 14, connecting with an exhaust-pipe 15, and upon opposite sides of said port are passages 16 and 17, connecting the steam-chest with the opposite ends of said low-pressure cylinder. The slidevalve 6 is provided on one side with two cut-01f parts a. and a and between the intermediate point a and cut-off parts a, a with cavities b '5 said cut-off parts and cavities controlling the admission-ports 7 and 8 and passages 12 and 13. The other side of the opposite Valve has two end cutoff parts 0 c and an intermediate cavity cl. Fig. 2 shows the. arrangement of the valve whendisposedfor the passage of the steam from the high-pressure cylinder to one end of the low-pressure cylinder and for the exhaust of steam from the opposite end of the latter cylinder through port 14,'from which it will be seen that the passages 12 and 16 are in open communication'with the cylinders,

'while the cavities b and d open communication, respectively, between the inlet-port 8 and passage l3 and between the exhaust-port 14 and passage 17. Assuming that both valves 10 and1l are open and the engine working double-acting, it will be seen that the piston 4 is at the limit of its outward stroke and that steam from port 8 is being supplied through the cavity 1) and passage 13 to. the outer end of said cylinder to force the piston back again. As the piston 4 moves back the live steam behind it and previously admitted through port 7, cavity b, and passage 12 to force it outward is forced out of the cylinder '1 through the passage 12 into the steamchest and thence through the passage 16 into the inner end of the low-pressure cylinder 2, where its expansive force is employed to force the piston 5 on its outward stroke. On the inward stroke of piston 5 the steam previously admitted through passage 17 to impel ICO said piston on its outstroke is forced back through said passage and passes through valve-cavity d and out through exhaust-port 14. As the pistons 4 and 5, respectively, reach thelimit of their in and out strokes the valve 6 moves to the left and the valve parts a a a and cavity b close the port 8 and open communication between the port 7 and passage 12 and between the port 13 and steam chest, while the valve parts 0 c and cavity 01 close communication between the steamchest and passage 16 and open communication between the steam-chest and passage 17 and between the passage 16 and exhaust-port 14. Hence steam will be admitted to the inner end of cylinder 1 to force the piston 4 inwardly, and the steam previously admitted into said cylinder through passage 13 will be forced through said passage into steam-chest and thence through passage 17 into the outer end of cylinder 2, and under the expansive force of this steam the piston 5 will be moved forwardly and exhaust of the spent steam behind the same will take place through the passage 16, valve-cavity d, and port 14. By closing either one of the valves 10 or 11 steam may be admitted solely to one end of the high-pressure cylinder 1, making the engine single-acting compound.

In the construction shown in Figs. 4 and 5, in which the engine is constructed to act solely as a double-acting compound engine and is not interchangeable from single to double acting, and vice versa, a single inletport 7' is employed to supply live steam to the passages 12 and 13, and the piston is provided between the cut-01f parts a a with a continuous or single cavity b the construction otherwise remaining the same. Fig. 4 shows the valve as arranged to open communication between the steam-chest and passages 12 and 16 and close communication between the chest and passages 13 and 17, the passage 13 being connected with inlet-port 7 through the valve-cavity b and the passage 17 with the exhaust-port 14 through valvecavity (1. Live steam passing into the highpressure cylinder 1 through passages 13 forces the piston4 to the left, and the steam'previously admitted in rear of said piston is forced from the cylinder 1 through passage 12 into the steam-chestand thence into low-pressure cylinder 2 through passage 16, forcing the piston 5 outward. The outward movement of the piston 5 forces the steam previously admitted in advance thereof out through passage 17, whence it passes through the valve-cavity (1 into the exhaust-port 14. When the two pistons 4 and 5, respectively, reach the limit of their in and out strokes, the valve 6 moves to the left and opens communication between the inlet-port 7 and passage 12 and between the exhaust-port 14 and passage 16, at the same time bringing passages 13 and 17'into communication with the steamchest. Steam will then be admitted to cyl inder 1 through passage 12, forcing piston 4 outward, and the steam in advance of said pis ton will pass out through passage 13 into the steam-chest and thence into the low-pressure cylinder 2 via passage 17. The piston 5 will then be forced inwardly and the spent steam in rear thereof exhausted through passage 16, valve-cavity d, and exhaust-port 14.

It will be seen that the above-described results are obtained by reason of a peculiar arrangement of the ports and passages and a novel and simple form of valves, thus providing an engine which is free from complicated parts and not liable to easily get out of order, as but a single valve-movement is employed, and a single eccentric need only be employed to operate the same to control the supply and exhaust of steam to and from both cylinders.

Again referring to Figs. 2, 3, 4, and 5, it will be noticed that the valves 6 consist of longitudinallydivided sections 6 and 6*, which are held apart and also held in proper contact with their respective valve-seats by means of a tapered sleeve E on the valve-rod 6, the taper of this sleeve being of a corresponding taper to the backs of the valves and the latter being united and adjusted to their faces by means of valve-rod nuts and jam-nuts g and g. By this construction it will be seen that wear can readily be compensated for and the valves at all times properly set to fit their respective seats, also that by the construction of the valve the same is adapted to maintain an approximate balance against intermediate steam-pressure on the backs of the valve-sections at all times.

From the foregoing description, taken in connection with the accompanying drawings, the construction, operation, and advantages of my invention will be readily apparent, it is thought, without requiring a more extended explanation.

Various changes in the form, proportion, and minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. A compound engine comprising high and low pressure cylinders having pistons operating therein, a steam-chest intermediate said cylinders and provided with valve-seats, one formed with a steam-inlet port and the other with an exhaust-port and both having passages leading from opposite sides of the port therein to the ends of the coacting cylinder, a slide-valve in the steam-chest consisting of two unconnected members, one governing the inlet-port and passages to the high-pressure cylinder, and the other the exhaust-port and passages to the low pressure cylinders, a valve-rod extending between the Valve members, and means upon said rod for connect ing the valve members thereto and for adjusting said valve members coincidently toward ICC their respective seats, substantially as de scribed.

2. A compound engine comprising high and on the opposite side, end cut-'ofi parts and an intermediate cavity cooperating with the ex.-

haust-port and passages to the low-pressure cylinder, and means independently govern: ing the supply of steam to the i n1et-ports,substantially as set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witne'sses.

JOSEPH HARDILL.

Witnesses:

FRANK A. SHOEMAKER, ROBERT BENSON.

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