US14125A - And working steam-valves as cut-offs - Google Patents

Description

SAT .S `P

CHAS. H. BROWN AND CHAS. BURLEIGI-I, OF FITGHBURG, MASSACHUSETTS, ASSIGNORS TO THE PUTNAM MACHINE CO.

MEANS FOR REGULATING AND WORKING STEAM-VALVES AS CUT-OFFS.

Specification forming part of Letters Patent No. 14,125, dated January 15, 1856; Ressued August 27, 1867, No. 2,754.

To aZZ whom t may concern Be it known that we, CHAs. H. BROWN and CHAs. BURLEIGH, both of Fitchburg, in the county of Vorcester and State of Mas sachusetts, have invented a new and Im proved Method of Regulating Cut-Off Valves by the Governor, of which the following is a full, clear, and exact description, reference being had to the annexed drawings, making part of this specification, in which- Figure 1, is a side elevation of an engine with our improvements attached; Fig. 2, a plan of the same; Fig. 3, a section through the steam valve upon the line F, F, of Fig. 2; Fig. 4, a section upon the exhaust valve, upon the line G, G, of Fig. Q.; Fig. 5, a plan of our valves; Fig. 6, a rear view of the same; Fig. 7 'a horizontal section upon the line B, D, of Fig. 8; Fig. 8, a vertical section upon the line E, E, of Fig. 5. Figs. 9, l0, ll, and l2, are sections through the valves upon various lines of Fig. 8, as indicated on the drawings, the views being taken from beneath; Fig. 13, details which will be referred to hereafter.

Our invention consists in a new and peculiar method of connecting the balance cut 0E valves of steam engines with the governor, by which the steam may be cut 0E at any point of the stroke according to the amount of work upon the engine, the parts for eEecting this end being simple, effective, and not liable to get out of order, or to require repairs.

To enable others skilled in the art to make and use of our invention, we will proceed to describe the manner which we adopt of carrying it out, referring generally to the principal parts of the engine, and describing more particularly the specific improvements which we have added thereto, giving lastly the operation of the whole combined.

In the accompanying drawings I-I, is the cylinder; I, the steam box; O, the piston rod; P, the connecting rod; K, t-he crank shaft. The latter carries a cog wheel L,

which engages with a gear M, upon a short shaft N.

Q, is a bevel wheel upon the shaft N, which gears with the wheel R upon the shaft S, which latter carries the cams that actuate the steam and exhaust valves.

The connection between the governor and the apparatus which actuates the valves will now be described: T, is the spindle of the governor, upon which slides the collar U, in the usual manner. This collar is embraced by the forked arm upon the top of the rod V, which slides freely in a vertical direction in the guide W, and is attached at its lower extremity to an arm X, secured to the shaft a, which vibrates in the bearings b, projecting from t-he frame work of the engine.

c, are arms attached to the shaft a, and vibrating with it.

CZ, are bent levers of the form represented in` Figs. 3 and 4L, which are pivoted to the arms c, at e. The extremities of these levers are allowed to play freely in slots at the lower end of the valve rods g. As now the collar upon the governor spindle rises and falls, the shaft a, is caused to vibrate in one direction or the other, and the levers d, are withdrawn more or less from the slots in the stems of t-he induction, or steam valves A', for a purpose which will now be explained.

h, are Cams upon opposite sides of the shaft S, and immediately beneath the levers CZ, upon which they impinge as the shaft S, revolves, and thus when the valves A', are raised from their seats, and steam is admitted to the cylinder.

In proportion as the balls of the governor diverge, the rod V, is raised, and the ends of the levers cl, are withdrawn from the slots in the bottom of the valve stems g, thus carrying the shoulders f, farther from the circles of revolution of the cam 7L. The levers d, are so arranged with reference to the governor and the cams 7L, that when the balls are at their highest point, the shoulders f, are withdrawn (as in Fig. 13), so that the cams revolve without touching` the levers, and the inlet valves are not opened. When however the balls are in any other position, the shoulders of the levers 0l, lie more or less over the cams it, and as the latter revolve, t-he levers are raised, and the inlet valves are kept open for a longer or shorter space of time. The steam is thus cut off sooner or later, in proportion as the balls are more or less distended. The levers (Z, are curved upon the under-side so that they may be eased down gradually as the cams revolve.

It is evident if the cam which opens the valves be allowed to make as many revolutions as the main shaft, that it will revolve 1800, while the piston moves once through.'

the cylinder, and that with such Van arrangement, it would not be practicable to regulate the operation of the valves; it therefore becomes necessary to revolve the shaft a, a' less number of times than the main shaft, in which case more than one cam will be required; if the shaft a, revolve half as fast as the main shaft, two cams will be necessary as in the case represented in the accompanying drawings. If the main shaftrevolves three times as fast as the shaft a, the latter will require three cams and so on.

It will be perceived that by means of the arrangement above described the valves may be made to feel the slightest change of velocity in the governor balls, while at the same time no work is thrown upon the governor, as even the weight of the rod V, and the parts connected therewith may be balanced by a weighted arm projecting fro-1n the opposite side of the shaft a, if in any case it be found desirable; in practice however we have not found this to be necessary. The exhaustvalves B', are operated similarly to steam valves, except that they are allowed to open and close withoutvariation.

11 are arms similar to the arms 0, which in lieu of being attached to the shaft a, are stationary and are secured to its bearings I). To the top of these arms are pivoted at 7c, the levers m, which are raised by the cams 0, upon the shaft S. As these arms z' are stationary the levers m, are so formed with reference to the cams 0, that the exhaust valves shall be held open during the whole passage of the piston as required. The construction and arrangement of the valves and steam passages will now be explained.

l/Vithin the steam chest I, is another box T. Upon the secondary box are the upper and lower seats of the steam valve A. a, are wings upon the spindle C', of this valve,

which serve to support the open rings p, p', the object of which is to guide the valves on their up and down motion. g, Q', are the valve disks seen in Figs. 3, 5, and 8, upon their seats. The box T', being entirely surrounded with steam, when the valve A', is raised, the steam passes in through the open rings 20, 29', through the opening 1, into the cylinder.

The operation of the exhaust valve, B', will now be explained. a', b', are the disks which close the eduction passage when resting upon their seats as seen in Figs. 4t, and 8. c', are wings which support the hollow ring d', which guides the valve in its motions. The seats of this valve are upon the interior box t, seen in Figs. 4, 7, and 8, the space within which is in constant communication with the exhaust passage X, and is entirely shut oli from the interior of the box T', except through the valve B', when the latter is raised from its seat. The operation of these valves is as follows. Vhen A', is raised, steam is allowed to enter from the steam chest into the box T', and through the passage r, into the cylinder, as indicated by the arrows y. As the piston commences upon its return stroke (the valve A' having been previously closed) B', is raised, and the steam passes from the cylinder through the opening 1 into the box T', through the valve B' into the interior box t', thence through the eduction passage X, into the conductor. and steam passages is economical, compact, and of simple construction.

Nhat we claim as our invention and desire to secure by Letters Patent is,

Operating the valves by means of the revolving cams L, in combination with the bent levers d, and their connections with the governor, in the manner and for the purpose substantially as herein set forth.

CHARLES H. BROWN. CHARLES IBURLEIGH. l/Vitnesses:

CHARLES MAsoN, CI-IAs. H. EAGERs.

[FIRST PRINTED 1912.]

This arrangement of valves

Images