US710729A - Governor-valve for steam-engines. - Google Patents

Description

N0. 7|0,729. Patented Oct. 7. I902.

H. B. WYMAN.

GOVERNOR VALVE FOB STEAM.ENGI'NES.

(Appliirat 'on filed 00a. 5, 1901.) (No Model.) 2 Sheets-Sheet l.

VIII 1 V INTO V Attarney No. 710,729. Patented Oct. 7, I902. H. B. WYMAN.

GOVERNOR VALVE FDR STEAM ENGINES.

{Application filed Oct. 5, 1901.]

2 Sheets-Sheet 2.-

(No Model.)

JNVENTOR WITNESSES Allamey' THF ripnms Packs 00.. mow-mo" wnsnmaroa: n. c.

UNITED STATES PATENT OFFICE.

HORACE B. \VYMAN, OF LEOMINSTER, MASSACHUSETTS.

GOVERNOR-VALVE FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 710,729, dated October 7, 1902.

Application filed October 5, 1901. Serial No. 77,727. (N model.) 7

To (all [Uh/07171 it may concern:

Be it known that I, HORACE BJVYM N, a citizen of the United States, residing at Leominster, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Governor-Valves for Steam-Engines, of which the following is a specification.

My invention relates to valves for regulating the amount of steam to enter the steamchest of an engine governed by the speed of the engine, and has for its object to provide a valve that will admit steam to the cylinder at the beginning of each stroke of the piston in the steam-cylinder at boiler-pressure and continue its admission through the entire period of the stroke, if the speed of the engine requires it, or that will cut off the steam at any point in the stroke where the further admission of steam would be unnecessary to maintain a predetermined speed of the engine.

In the drawings, Figure 1 represents a portion of a steam-engine, showing in section an ordinary construction of cut-off valve, means for operating same, an end view of the casing of myinvention, showing the arm for operating the valve and its connections, and a contrifugal governor and its connections; Fig. 2, a vertical longitudinal view in section of my invention; Fig. 3, a sectional View taken on a line at right angles to the line of the section of Fig. 2; Fig. 4, an end view of the valvecasing, showing the connections between the centrifugal governor and the arms for operating the cut-offs in my valve; and Fig. 5, an enlarged detail view of one of the arms above mentioned.

In the drawings, in which similar reference characters designate like parts throughout the several views, 1 indicates any ordinary construction of steam-chest for an engine, shown for the purposes of illustration on a stationary engine, though my device may be applied to any form of engine in which steam is a motive power.

2 represents the ports for the inlet and exhaust of steam, and 3 the outlet for exhausted steam.

4 indicates the reciprocating valve, shown in Fig. 1 as covering both steam-ports, the piston in the steam-cylinder being in the middle of its stroke and driven by the expansion of the steam in the cylinder. The valve 4 is connected by the rod 5 to the shaft 6 of the fly-wheel 7 and is moved by an eccentric mounted thereon.

8 represents the casing ofmy governorvalve, having the cylindrical bore 9 therein, in which is inserted the cylinder 10 and adapted to oscillate therein. One end of the cylinder 10 is closed, as shown at 11, and has fixed to its center a shaft 12, that extends through an opening 13 in the head 14 of the casing S and has keyed to it an arm 15. The arm 15 is connected to the rod 5 by a rod 16, which is pivoted to the arm 15 and clamp 17 on said rod 5.

18 and 19 are slotted openings in the cylinder 10, which when the arm is in the vertical position shown in Fig. 1 are open to the inlet of steam through the port 20 by way of the hollow portion of the casing 21 to slot 19 and the opening 22 under the cylinder 10 to slot 18. The steam after flowing through the apertures 18 and 19 passes through the open end23 of the cylinder 10 and through the port 24 into the valve-chamber 1.

25 indicates any ordinary construction of centrifugal governor employing the pivoted arms 25 and weights 25 mounted on the hollow shaft 26, at the lower edge of which is fixed the bevel-gear 27, the shaft 26 being journaled on the stem 28.

29 represents a bevel gear-wheel keyed on the shaft 30, and 31 a sheave keyed to the same shaft.

32 indicates a belt connecting the shaft 6 of the engine and the sheave 31.

33 represents a spindle revolving in a cylindrical opening 3a in the stem 28 and connected by the arms 35 to the arms 25 of the governor, the arms 35 being pivotally connected to the head of the spindle 33 and to the arms 25.

36 represents slots in the side of the hollow shaft 26, through which the arms 35 extend.

37 represents shafts journaled in the casing of valve, to which are keyed theiarms 38.

39 indicates segmental plates, which are connected to the ends of the arms 38 by the links 40. The shafts 37 extend to. the-exterior of the valve-casing and have loosely mounted on each shaft a lever 41 and fixedly mounted to each shaft an arm 42, a ertured near its end to receive a pin 43, pivoted in the lever 41 and having a coil-spring te to bear againstthe top of the arm 42. Loosely mounted on the spindle 33 by means of shoulders a5 is a rod 46, and pivoted at each end of the rod 46 is a rod 4.7, which is pivotally connected to the end of the lever 41.

The operation is as follows: Assuming that all the parts of the engine are in the positions shown in Figs. 1 to a, steam is being forced through the inlet 20, around the cylinder 10, through the slots 18 and 19, through the end of the cylinder 23 and the port 2% into the valve-chamber 1. Then assuming that the valve 4 moves toward the shaft 6 the port 2 farthest from the shaft 6 is open to the ingress of steam to the cylinder while it is exhausting through the other port 2 and outlet 3. At the same time that the piston 4 moves toward the shaft 6 the arm is drawn in the same direction by the rod 16 turning the cylinder 10, so that the slot 18 is covered by the top of the casing 9, and the balance of the stroke of the piston in the steam-cylinder is made with only the amount of steam admitted through port 19. On return of the piston 4 the operation is reversed.

It will be readily seen that if the engine is making only slow speed the segmental plates 39 will be lowered to the position shown in Fig. 2, so as not to interfere with the passage of steam through the slots 18 and 19; but as the speed of the shaft 6 increases the weights of the governor 25 will fly outward, raising the lever 41 and arm 42 by means of the spindle 3t and rods 47. The shaft 37 will then be turned, raising the arms 38 upward, and by means of the links t0 the plates 39 will be raised against the cylinder 10. IVhen the plates are raised against the cylinder, the effect would be to prevent the passage of steam through the slots 18 or 19, respectively, during the portion of the stroke in which said slot may be in alinement with the plate. As the speed of the engine increases the plates will be gradually raised, so that the period during which the steam can pass through slots 18 and 19 will be but slight, thus permitting the speed of the engine to decrease to its normal speed.

The purpose of the construction of the lever 41, loosely mounted on the shaft 37, and the arm 42, keyed to the same shaft, is to allow the segmental plates 39 to be lifted by friction between the surface of said plates and the cylinder 10, assisted by the impact of the steam against said plates after the completion of each stroke of valve 4:, and thus prevent steam from passing through the ports 2 ex cept at the beginning of each stroke of the piston in the steam-eylinder. It will be readilyseen from the drawings that at the moment when both ports 2 are closed the slots 18 and 19 are outside the dome of the casing 8 and steam is permitted to flow therethrough. Now should the valve be moving toward the right the slot 18 will pass under the dome of casing 8, while steam will continue to flow through slot 19 until said slot passes under the plate 39 on that side of the cylinder 10. No steam will then be admitted to the steamcylinder, and the piston therein will complete its stroke by the expansion of the steam. After the valve at has completed its stroke to the right and is returning it will be readily seen that except for the provision of the loose lever 11 and the arm 42 the slot 19 would pass from under the plate 39 at the same point at which it passed under the plate and steam would be admitted to the steam-cylinder before the stroke of the piston had been completed, and thus cause a jar to the machinery. By providing for an independent upward movement of the segmental plates 39 this danger is averted and the slots kept closed until the piston in the cylinder has completed its stroke and is ready for the next one.

Having thus described my invention, what I claim is- 1. In a cut-off valve for steam-engines, the combination with the governor of a slotted valve journaled in the valve-casing, segmental plates arranged on each side of said cylinder, said plates being so connected with the governor of the engine as to alternately cut off the steam after the amount necessary to maintain the speed has been admitted and to readmit steam before the stroke begins, substantially as shown and described.

2. In a cut-off valve for steam-engines, the combination with the governor of a slotted valve journaled in the valve-casing, segmental plates arranged on each side of said cylinder, said segmental plates being so arranged and connected with the governor of the engine as to alternately cut off the steam at the point where not necessary to maintain the speed of the engine, and positively readmit it before the beginning of each stroke, substantially as shown and described.

3. In a valve for steam-engines, a casing, inlet and outlet ports therein, a slotted cylinder journaled in said casing, a shaft journaled on each side of said cylinder, a segmental plate swung on each shaft, and means for raising and lowering said plates, substantially as shown and described.

4. In a valve for steam-engines, a casing, inlet and outlet ports therein, a slotted cylinder journaled in said casing, a shaft journaled on each side of said cylinder, arms keyed to said shaft, segmental plates pivoted on said arms, and means for revolving said shafts, substantially as shown and described.

5. In a valve for steam-engines, a casing, an inlet-port therein, a slotted cylinderjournaled in said casing having one end closed the other open, an outlet-port opening opposite to the open end of the cylinder, and means forimparting an oscillating motion to said cylinder, substantially as shown and described.

6. In a valve for steam-engines, a casing, inlet and outlet ports therein, a slotted cylinder journaled in said casing having one end closed and the other open, a shaft fixed to the closed end, an arm keyed to said shaft connected to the shaft of the engine, and means for regulating the quantity of steam permitted to flow through said slotted cylinders, substantially as shown and described.

7. In a valve for steam-engines, a slotted cylinder journaled in the casing thereof, a shaft journaled on each side of said slotted cylinder, arms keyed to each shaft, a segmental plate depending from said arms, an arm keyed to each shaft exterior of the valve and connected to a governor, and means for oscillating said slotted cylinder, substantially as shown and described.

8. In a valve for steam-engines, a slotted cylinder journaled in the casing thereof, a shaft journaled on each side of said cylinder, arms keyed to each shaft, links pivoted to said arms, a segmental plate pivoted to said links, an arm keyed to each shaft exterior of the valve and connected to a governor, and means for oscillating said slotted cylinder, substantially as shown and described.

9. In a valve for steam-engines, a slotted cylinder journaled in the casing thereof, a shaft journaled on each side of said cylinder, a lever loosely mounted on each shaft an arm fixedly mounted on each shaft, a pin fixed to said lever and extending through said arm, a coil-spring fixed to said pin and bearing against said arm, said lever connected to the governor of the engine, and means interior of the valve for regulating the flow of steam through said slotted cylinder, substantially as shown and described.

10. In a valve for steam-engines, a slotted cylinder journaled in the casing thereof, a shaft journaled on each side of said cylinder, arms keyed to each shaft, a segmental plate depending from said arms, a lever loosely mounted on each shaft, an arm keyed to the shaft, a pin fixed to said lever and extending through said arm, a coil-spring fixed to said pin and bearing against said arm, and means for connecting said levers with the governor of the engine, substantially as shown and described.

11. In a valve for steam-engines, a slotted cylinder journaled in the casing thereof, a shaft journaled on each side of said cylinder, arms keyed to each shaft, links pivoted to said arms, a segmental plate pivoted to said links, a lever loosely mounted on each shaft, an arm keyed to the shaft, a pin fixed to said lever and extending through said arm, a coil-spring fixed to said pin and bearing against said arm, and means for connecting said levers with the governor of the engine, substantially as shown and described.

In testimony whereof I hereto affix my signature in the presence of two Witnesses.

HORACE B. WYMAN.

Witnesses:

FRANKLIN FREEMAN, FRANK M. SNOW.

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