US379280A

US379280A - Throttle and governor valve

Info

Publication number: US379280A
Authority: US
Publication date: 1888-03-13
Anticipated expiration: 1905-03-13

Description

3 sneetssheet 1.

(No Model.)

R. H. MAT-HER. THROTTLB AND GOVERNOR VALVE l(Nulsaoaex.) ssheets-sneet.

R. H. MATHER.

THROTTLE YAND GOVERNOR VALVE. No. 379,280. Patented Mar. 1-3, 1888.

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il i H g @MM/M 60%@ V(No Model.) 3 Sheets-Sheet 3. R. H. MATHER.

THROTTLB AND GOVERNOR VALVE.

No. 379,280. Patented Mar. 13, 1888.

A @/w/fhw; .wfm 4 V y M i V -ernor-valve combined, and is designed for the Nirnn STATES RICHARD H. MATHER, ,OF

TH ROTTLE AND G WINDSOR, CONNECTICUT.

OVERNO R VALVE.

SPECIFICATION forming part of Letters Patent No. 379,280. dated March 13, 1888.

Application filed September 4, 1886.

To all whom, it may concern.-

Be it known that I, RICHARD H. MATHER, of Vindsor, Hartfordl county, Connecticut, have invented a new and useful Throttle and Governor Valve for Steam-Engines, of which the following is a specification, illustrated by the accompanying drawings.

This invention is a throttle-valve and a govpurpose of automatically regulating the iiow of steam from the boiler to the engine,and for the purpose of shutting off steam by hand by means of a single valve. l

The best mode in which I have contcm plated the application of my invention is illustrated in the drawings, in which- Figure 1 is a plan view of my invention as applied to a rotating or revolving engine. Fig. 2 is an end view of the same. Fig. 3 isa central longitudinal vertical section of the valve and valve-seat,with portions of the supply-pipe and steam-pipe of the engine. Fig. 4 is a like section of the valve and valve-stem in a modified form. Fig. 5is a like section of the valve and valve-stem in a different modified form, and Fig. 6 is a cross-section on xx of Fig. 5.

The engine, which is shown in the drawings and is indicated by the numeral 1, has the external form of a closed cylinder or drum,is provided with terminal hubs 2 and 3, and is rotatably mounted upon a hollow shaft, 4, which serves as a steam-pipe and exhaust-pipe. This engine is preferably constructed in the manner which is set forth in an application for a patent ony steam-engines iiled by me April 19, 1886, under Serial No. 199,323. This pipe is supported in a fixed position by. standards 5 and 6, which rise in a convenient form from base 7. Upon hub 2 is a metallic sleeve, 8, which is movable lengthwise between engine 1 and standard 5. This sleeve is formed with a circumferential channel or surrounding groove, 9fa-nd is provided with ears 10 and 10, which extend radially therefrom in opposite directions. Through the cylindrical wall of sleeve 8, in any convenient part thereof, is a spiral slot, 11, whose length and pitch depend upon the end-play which is to be imparted to the valve, hereinafter described. In this slot is a pin, 12, which sticks out radially from hub 2.

Serial No. 212.687. (No model.)

Upon that end of engine 1 which is adjacent to sleeve 8 and is shown in Fig. 2 is mounted a centrifugal weighted lever, 13. By pin 59 one end of this lever is pivoted to the engine at a distance from hub 2. The other end of lever 13 is provided with a spring, 14, which tends to draw that lever toward hub 2. A movable weight, 15, is fastened by set-screw 16 to lever 13, near the free end of the latter, and stop-

pins

17 and 18 upon opposite sides of lever 13 prevent the same from oscillating toward hub 2 or away from it to a greater extent than is required in the due operation of the valve, as hereinafter explained. This lever and the adjacent ear 10 of sleeve 8 are connected by a link, 19. A second weighted lever, 20, provided with a like spring, 21, movable weight 22, set-screw 23, and stop-pins 24 and 25, is similarly pivoted to the same end of engine 1 upon the opposite side of hub 2, and is similarly connected with the remaining ear l0 of sleeve 8 by link 57.

As but a single weighted lever is shown in Fig. 1, while two such levers are shown in Fig. 2, these figures may be considered, in respect of the number of levers employed, as representing two different modes of construction, each of which is a modification. of the other.

The end of steam-pipe 4 is screwed into the end of an iron casting, 26, which is of irregular cylindrical form, and has a port, 27, (shown in Fig. 3,) into which is screwed the end of the su pply-pipe 28. Within thiscasting is formed the seat of a balanced piston-valve, 29. This valve is a hollow cylinder open at both ends and having lateral steam-ports 30, whose aggregate area is as great as the area of supplypipe 28 or steam-port 27. Valve 29 is also provided with an internal hub, 31, to. which the valve-stem 32 is loosely connected. Casting 26 is' enlarged about steam-ports 30 in such a manner as to form a ringshaped internal cavity, 33, around valve 29, continuous with steam-port 27. The end of casting 26 remote from engine 1 is closed by means of a cap, 34, which is fastened thereto by screws. This cap, which is of general circular form, has two ears, 35 and 35, which radiate therefrom in opposite directions. Through the middle of cap 34 is a hole, 36, in which valve-stem 32 may reciprocate. At a little distance from hole 36, and parallel thereto,

IOO

through cap 34, is another hole, 37, in which a false valvestem, 38, of the same size as stem 32, may reciprocate. These two stems are connected by a lever, 39, which is pivoted in the middle to a projection, 40, upon the inside of cap 34. This cap is considerably thickened where stems 32 and 38 pass through, in order to prevent the escape of steam. At the outer end of stem 32, and continuous therewith beyond cap 34, is a screw, 41, which is pivoted with a hand-wheel, 42, for the manipulation of the same. On opposite sides of casting 26 are two like and parallel rods, 43 and 43, each of which passes loosely through a hole in the end of one ear, 35, and through a hole in the end of bracket 44, which projects from the upper part of standard 45. These rods are rigidly connected togetheratone end by means of a yoke, 45, which has a central hub and a female screw for the accommodation of screw 41. Each of these rods is provided at the other end with a tongue or finger, 46, which projects therefrom, and is adapted to travel in groove 9 during the revolution of sleeve 8.

The modications shown in Figs. 4, 5, and 6 require additional explanation.

In Fig. 4 valve-stein 32, being attached, as before described, to hub 31 within valve 29, reciprocates through the central portion of cap 34, which is extended as a sleeve, 47. Stem 32 is in this instance hollow through a considerable portion of its length, and contains a tubular cavity, 48, which at one end ini tercommunicates by ports 49 with the hollow interior of valvev 29. Vithin sleeve 47 are two separate bushings, 50 and 5l, whichpare fitted closely and immovably thereto. Vi

thin bushings

50 and 51 valve-stem 32 is of uniform size, but in the space between them is enlarged in a head, 52, which is movable end wise within sleeve 47. The interior cross-section of sleeve 47 is twice as great as the cross-section of stem 32. Between bushing 51. and head 52 is a cylindrical chamber, 58, which communicates with the external atmosphere by passage 53 in sleeve 47, while between bushing 50 and head 52 is also a cylindrical chamber, which communicates with cavity 48 by ports 54.

ln the modification which is shown in Figs. 5 and 6 the valvestem 32 is of uniform size, and is attached to a standard or partial hub, 3l, within valve 29, by means of a fixed collar, 55, which is placed between two arms, 56 and 56, branching from standard 3l. In this instance stem 32 is adapted to reciprocate in sleeve 47, which, being cut away in the middie, lies partly on each side of collar 55. That port-ion of sleeve 47 which receives the end of stein 32 is open to the external atmosphere through a passage, 53, within that sleeve.

The invention whose construction has now been described with modifications further presents all other features and particulars of construction which are involved in the mode of operation which is illustrated in the drawings and is now to be explained.

When the engine is at rest, the

springs

14 and 21 draw levers 13 and 20 to positions of contact with stop-pins 18 and 25, respectively, and said levers, acting through links 19 and 57, turn sleeve 8 upon hub 2 to such a position that pin 12 stands in that end of slot 11 which is next to engine 1. Sleeve 8 accord' ing-ly stands at a little distance away from the engine, andthe rods 43, being pressed endwise away from engine 8 through the agency offtongues 46, carry yoke 45 in the same direction, and thereby draw out stem 32 and uncover ports 30 within chamber 33 in casting 26. This is upon the assumption that stem 32 has been so far drawn out by the manipulation of screw 41 that ports 30 can be removed from the cover of the contiguous valve-seat in the manner described. When it is desired to close ports 30 in such a manner as to prevent the passage of steam through this valve, that result is accomplished by turning in screw 41 by wheel 42 until those ports are covered by the close-tting wall of the valve-seat.

Then the engine is to be brought into action, the valve is opened by the use of wheel 42. The steam which is admitted from the supply-pipe 28 thenfills chamber 33, and passes through ports 30 into the interior of valve 29, whence it passes to the engine through pipe 4. Valve 29 is balanced between the pressure of steam behind and before it by the aid of the pressure which, being exerted upon the inner end of stem 38, is transmitted to stem 32 by lever 39, as shown in Fig. 3, or by the aid of the pressure which is exerted upon head 52 in chamber 58, as shown in Fig. 4, or by the exposure of both ends of stem 32 to the external air, as shown in Figs. 5 and 6.

As the engine revolves, the weighted levers 13 and 2O tend to separate from their respective positions, which are above described, and to move toward positions of contactwith stoppins 17 and 24, respectively. As soon as any such motion occurs, sleeve 8 is turned upon hub 2 in such a manner as to be moved by pin 12 bodily upon that hub toward engine l. This motion is communicated to valve 29 through tongues 46, rods 43, yoke v45, and stem 32. In this manner any increase in the speed of the engine, above the normal speed for which it is designated to regulate, causes a corresponding diminution of the steam which is admitted thereto. By a reverse mode of operation any diminution in the speed of the engine below the same normal speed causes a corresponding increase of steam-supply, so that the speed of the engine regulates itself automatically within the limits imposed by the sensitiveness of the automatic regulating mechanism, which has been described. The normal speed of the engine may be increased or diminished by setting the

weights

15 and 22 nearer or farther away from the free ends of their respective levers 13 and 20.

As the valve is carefully balanced and moves with little friction, and as the weights 15 and IIO @frezen 4 s 22, being of considerable size, are very sensitive to changes of speed, the above-described mechanism secures an exceedingly prompt and close regulation of speed.

I claim as my inventionl. Asteam-engine revolving upon a stationary shaft, and a sleeve upon the rotary hub of said engine, said hub being provided with a projecting pin and said sleeve having a slot for the accommodation of said pin, in combination with mechanism which is adapted to change the relative position of rotation of said hub and sleeve according to the speed of the engine, a piston-valve, and a yoke which receives the longitudinal motion of said sleeve and communicates the same to the stem of said valve without change of direction, substantially as and for the purpose specified.

2. A steam-engine revolving upon a hollow shaft, -a rotary sleeve upon a hub of said engine, a pin and slot whereby said hub and sleeve engage each other, and a centrifugal governor which is mounted upon a head of said engine and is adapted to vary the relative positions of said sleeve and hub according to the varying speed of the engine, in combination with a piston-valve which is located in a prolongation of said hollow shaft, and mechanism which is adapted to communicate the resulting reciprocating motion of said sleeve to the stem of said valve, substantially as and for the purpose specified.

3. A rotary hub of a steam-engine and a rotary sleeve upon said hub, said hub and sleeve being provided with an engagement pin and slot, in combination with mechanism which is adapted to vary the relative position of said sleeve and hnb according to the speed ofthe engine, a cradle engaging said sleeve and moving longitudinally therewith, and a valve which is provided with a valve-stem having an adjustable screw-connection with said cradle, substantially as and for the purpose specified.

4. A movable sleeve upon the hub of a steam-engine, a valve controlling said engine, and a cradle whereby the longitudinal motion of said sleeve is communicated to the valve stein, in combination with a screw-connection tween said cradle and'valvesteni,whereby said valve may be operated by hand independently of said governor, substantially as and for the purpose specified.

6. In combination with a movable sleeve upon the hub of a revolving steam-engine and with the stem of a piston-valve controlling said engine, an intermediate cradle consisting of two parallel rods which are movable lengthwise in suitable supports and are rigidly connected with each other by means of a yoke, to which said stem is attached, subst-antially as and for the purpose specified.

7. For the purpose of transmitting motion from a grooved sleeve upon the hub ofa revolving steam-engine to thestem of a'piston by which said engine is regulated, two parallel rods which are movable endwise in suitable bearings, are armed at one end with tongues or lingers for engagement with said sleeve,and are connected with each other at the other end by means of a yoke, to which said stem is attached, substantially as and for the purpose specified.

8. A balanced piston-valve provided with a valve-stem and a false valvestem, which are balanced against each other by means of a lever, substantially as and for the purpose specied.

9. A valve-casing having a head which is provided with an interior chamber and an outlet therefrom to the external air, a balanced valve-piston within said casing, and a valvestem which works through said head, in combination with a false valve-stem which works in said chamber, substantially as and for the purpose specified.

10. A centrifugal governor, a sleeve for transmitting motion from said governor, two parallel rods, and an intermediate yoke for transmitting motion from said sleeve, in combination with a balanced piston-valve whose stem terminates in a screw which passes through a bushing in said yoke and is armed with a hand-wheel, substantially as and for the purpose specified.

1l. Two parallel rods adapted to move lengthwise in suitable supports and attached to each other by means of a rigid yoke,in combination with a valve-stein which is provided with a screw-thread working through4 said yoke and with a terminal hand-whee1, substantially as and for the purpose specified.

In testimony whereof Ihave hereunto set my name in thepresence of two witnesses.

RICHARD H. MATHER.

Witnesses:

WILLARD EDDY, ALBERT E. WALKER ICO IIO