US1042846A - Steam-actuated exhaust-valve. - Google Patents

Description

E. TURNER. STEAM AQTUATED EXHAUST VALVE.

APPLIGATION FILED No1/23o, 1910.

,042.846, Patented Oct. 29, 1912.

Vlialust valve held open by live steam from the UNITED v'STATES PATENT ormoni.

ERNEST TURNER, OF'DADEVILLE, ALABAMA.

To all whom it mag/007206151.: y Y 4 Be it known that I, ERNEST TURNER, a citizen of the United States, residing at'l Dadeville, in the county of Tallapoosa and State of Alabama, have invented certain new and useful Improvements in Steam- Actuated Exhaust-Valves, of which the following is a specification.

This inventionrelates to steam actuated valves and more particularly to an auxiliary exhaust valve Jfor use with any type ofv plain slidevalve engine, enabling said engine to usesteam expansvely to the best advantage by eliminating excess back pressureon the pist-on. This isaecomplished in the present/ instance by means of a `supplementary ex# working side of the piston so that exhaust ysteam may escape after the main exhaust'by way of the slide valve is closed, said auxiliary exhaust continuing until .the piston has nearly reached the end of itsstroke, leaving only sufficient steam in the cylinder to cushionv the piston.

The valve'is simple in construction and operation, comprises but one movable part and works automatically at the beginning of each stroke of the piston. v

In the accompanyinr drawing which illustrates one embodiment of the invention,- Figure 1 is alongitudinal sectional view of the device applied to a steam cylinder, a portion only of which isshown; Fig. 2 is a sectional view on thc line 2-2 of Fig. l, and Fig. 3 is a like view on the line l-S of the same figure. .i

ln the drawing, 10. indicates the cylinder of a steam engine which may be supplied with inlet and exhaust valves ot any type; and as these valves torni no part oit' the present invention they have been omitted from the drawing. The cylinder is provided with the usual piston ll and is closed atvits ends by heads 12 and 13.

Bolted against the outer side of the cylinder 10 at any suitable point is a casing 111, nearly as longv as the cylinder and formed with a. longitudinal opening 15 therethrough, preferably cylindrical, and closed ateach end hy a head 1G. Flanges 17 are termed ou thecasing- 14 to receive the fastening bolts, as shown in Figs. 2 and 3. Within the casing 14 and rnear veach end is a port 18. opening through the side wall of said casing adjacent the cylinder 10, said ports registering Specification of Letters 1Patent.

Patented Oct. 279,191?.

Application filed November 30, 1910..- Serial No. 594,897.

` so as to slide in unison, by a rod 24C of such length that when one port 22 is closed by a piston, the other port Q2 will be open to permit the escape of steam from the cylinder 1() into the casingT l5. The-ports 18 in he casing are wider than, and surround the bushings so that the vpressure on the piston valves when the ports are closed will he equalized and thus prevent undue frictio.. and binding. A small port 25 in eaclicylin# der head is connected by a pipe 26 with tti'e head 16 closing the adjacent end et tlie casing `14, so that live steam from the cylinder lnay enter 'the casing behind the piston valves and operate them. y The following` description will clearlv explain the operation of tlie'inv'ention. bThe piston 11 being' at the end of its stroke. say at the left as seenin Fig. 1, will cover the port 1S) at that end of the cylinder. Steam entering the cylinder in the usual manner through the slidevalve, not shown.l passes into the space betweenvthe head 12 and the i piston l1 to move the piston in the direction of the arrow. Some of the'steam enters the small port Q5 in the head 12 and passing through the connecting pipe 26 into the casing' 14, forces the piston valves to the right or into the positionrepresented in Fig. l, thereby closingv the port 22`at the leftand opening the like port at` the right of the casing. Exhauststealn can then pass from 'the c vlinde. through the ports 19, 18 and 22 into the casing' 14 and out through a suitable pipe 27. The main exhaust i'tmust be understood. takes place through the slidevalve as usual. As the piston travels to` the right, the closed port 19 is uncovered, but escape of steam is prevented der as indicated byldotted lines, Fig. 1. The

steam remaining in the cylinder will bev compressed during the balance of the stroke ardcushion the piston. The inletport at the right of the cylinder Will now be opened and live steam entering between the piston and the cylinder head 13 will also pass through the small port S in that head and the pipe 26 leading therefrom into' the casinfby l; and drive the piston valves in the opposite direction so that exhaust may take place from the other end of the cylinder. By the use of this valve the main slide valve can be set to cut oil' at any part ot the stroke so that the steam can be used expansively Without causingl back pressure through the early closing,` of the exhaustr port-s.

What l claim is:-

l. An auxiliary exhaustvalve Lir feiigiiie cylinders compri-singr a casing,I having a. live steam portand anexhaust steam port. at each end connected to corresponding ends of the engine cylinder respectively through openings in thel cylinder heads and Walls ot the' cylinder, and a reciprocating valve in said casing operated automatically' by the live steam from the working side 'o't" the cylinder piston for opening, the exhaust port conimunicating with theopposite sideo'l the.

. cylinder piston and holding it open aiter the main exhaust is closed.

2. An auxiliary exhaust valve for engine cylinders comprising a casing having a li ri: steam port and anexhaust port at each end communicating with corresponding ends et' the engine cylinder respectively through openings in the cylinder heads and Walls of the cylinder, and a double piston reciprocatii'igir valve in said casing operated automatically at. the beginning ot' each cylinder piston stroke by live steam from the Workinf; side of said piston for opening the exhaust port onl the exhaust side of the saine piston and holding it open after the main exhaust is closed and until the stroke is about completed.

f5. An auxiliary exhaust valve for engine l cylinders comprising` a casing fastened to the cylinder, a double reciprocating valve in said casing adapted to4 alternately open and close'an exhaust port hear each end of said cylinder, anda separate live steam port connecting each end of the cylinder to the corresponding end of the casing, whereby live steam may enter the' easing fronrlhe cylinder and operate the valve.

4. An auxiliaryexhaust valve for engine cylinders comprising a casing fastened to the cylinder, ports connecting said cylinder and casing near their adjacent ends, a reeiprocating,` valve adapted to alternately open said ports for the passage oi exhaust steam from the cylinder, the piston in the cylinder adapted to close said 'ports prior to the seating of the valve, whereby said piston may be cushioned by the uneseaped exhaust, and other ports for conveying lire steam from the ends of the cylinder to the correspendingA ends ol the casing for operating said valve.

3. An auxiliary exhaust valve for engine cylinders comprising a `casing fastened to the* cylinder, registering ports in the'cylinder and casing near their respective ends, a double piston valve adapted to alternately open ,said ports for the passage ot exhaust steam into said casing, spaced pairs of bushes in the ends of said casing Within which said valves slide, the spaces between said pairs of bushes registering withthc ports in the casing, and a separate live steam port opening into each end of thecasing.

C. In combination, a cylinder, a piston adapted to reciprocate in said cylinder, and an auxiliary exhaust valve for the cylinder coniprising` a lcasing fastened to the cylinder, alined ports in the cylinder and casing near their respective ends, double piston valve adapted to alternately open said ports for the passage of exhaust steam into said casing, the piston adapted to close said ports prior to the sealing),` o t' the valve whereby said piston is cushioned hy the unescaped exhaust, spaced pairs oit bushes in the ends of said casing?r within which said valves slide, the spaces between said pairs of' bushes registering with the alined ports in the cyl inder and casing, and a separate live steam port opening into each end of the casing.

In testimony whereof I allix my signature in presence of two witnesses.

ERNEST TURNER.

Wi t-nesses F. P. VALLACE, J. H. 'Wynn'.

Images