US319251A - Speed-governor for steam-engines - Google Patents

Description

(No Model.)

B. HILL.

SPEED GOVERNOR FOR STEAM ENGINES. No. 319,251. Patented June 2, 1885.

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EBENEZER HILL, OF SOUTH NORWVALK, CONNECTICUT.

SPEED-GOVERNOR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 319,251, dated June 2, 1885. Application filed March 16, 1885. (No model.)

new and useful Improvements inGovernors for Steam-Engines, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming part of this specification,

in which similar letters of reference indicate corresponding parts in both the figures.

Figure 1 is a sectional side elevation of one of my improved speed-governors for steamengines. Fig. 2 is a plan view of the same, partly in section, through the line 00 as, Fig. 1. Fig. 3 is a detail section view.

The object of this invention is to provide speed-governors for steam-engines, particularly for such engines as are used for compressing air or pumping water, which shall be so constructed as to prevent the speed of the engine from exceeding a fixed limit, and at all speeds below the said fixed limit to regulate the speed in' exact proportion to the amount of compressed air consumed.-

The invention relates to a speed-governor for steam-engines, constructed with a ball-governor connected with an engine, and with a pipe leading to a reservoir for a fluid under pressure and provided with a valve opened by the spread of the governor-balls, in combination with a cylinder having side slot and a piston working in the said cylinder and connected with the stem of a throttle-valve, wh ereby a change of speed in the engine will cause a fluid to act on the said piston to move a throttle-valve, and thus regulate the speed of the engine. WVith the cylinder and its piston connected with the stem of a throttle-valve is connected a second piston, and a safety-valve connected with the compression-chamber of an air-compressor, whereby an excess of press ure in said compression-chamber will raise the said pistons and close the said throttlevalve to check the speed of the engine, as will be hereinafter fully described and then claimed.

A represents the body or stock of a valve, which is placed in the steam-supply pipe B of the engine. C is the valve, which, when at the lowest point of its movement, is wide open, and allows steam to pass through without being throttled, and which, when raised, contracts the steani-passage in proportion to the amount of its upward movement. The stem D of the valve Cpasses out through a stuffingbox, IE, and to its upper end is attached a piston, F, which works in a small cylinder,

G, placed above the valve-stock A and supported by standards H, formed upon or attached to the said cylinder and to the cover of the valve A C. The standards H are curved outward, as indicated in Fig. 2, to give free access to the stuffingbox D. With this con struction the valve C will be closed and opened by the upward and downward movement of the piston F.

At one side of the cylinder G is placed a centrifugal ball-governor, I, which is constructed in the ordinary manner, except that the valve J of the said governor is constructed to open when the balls are thrown outward by centrifugal force. The governor I is connected by the pipe K with some reservoir containing a fluid under pressure-as, for instance, the air-reservoir of an air-compressorand is connected by a driving-belt with the mechanism of the engine to be regulated. When the speed attained is such as to cause the balls of the governor I to move outward so far as to open the valve J, the air or other fluid will flow from the pipe K through the I valve J and pipe L into the cylinder G, below the piston F, and will raise the said piston, and thus throttle the steam in its passage through the valve A C.

In the side of the cylinder G is formed a slot, M, the width of which is regulated by an elastic plate, N. The edge of the plate N is inserted in the slot M, and the said plate is secured by a screw, 0, to a recessed lug, P, formed upon the said cylinder G at the side of the slot M, so that by turning the screw 0 the plate can be deflected more or less to regulate the width of the slot, as shown in Fig. 3. With this construction, the fluid that passes the valve J and enters the cylinder G escapes through the slot M, and as the said valve J opens wider and wider the piston F is raised higher and higher, uncovering more and more of the slot M, and thus enlarging the escapepassage for the said fluid, so that the throttling of the steam by the valve C is regulated by the speed of the ball-governor I.

Within the cylinder G, and beneath the piston F, is placed a second piston, Q, and with the said'cylinderG, beneath the piston Q, is connected the end of a pipe, R, leading to a safety-valve, S, which is connected by the pipe '1 with a fluid under pressure. With this construction, when the pressure of the fluid exceeds the amount for which the safetyvalve'S is set, the said fluid opens the said safety-valve S, enters the cylinder G, raises the piston Q, and escapes through the slot M. The piston Q in its upward movement pushes the piston F before it, and thus throttles the steam in its passage through the valve 0; The upward movement of the piston F is limited by a hand-screw, U, passing in through the upper head of the cylinder Gr.-

To the piston Q is attached a tubular pis ton-rod,'V, through which the valve-stem D passes, and which passes down through the lower head of the cylinder G.

To the lower end of the tubular piston-rod V is attached or upon it is formed a lug or flange, W, through which passes a hand-screw, X, the forward end of which comes in contact with the lower head of the cylinder G, and thus limits the upward movement of the piston Q independently of the pistonF. With this construction the steam will be throttled and the speed of the engine lessened by an undue increase of speed in the engine or by an excess of pressure in the compression-chamber of anair-compressor.

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

1. In a speed-governor for steam-engines, the ball-governor I, connected with the engine, and with a pipe, K, leading to a reservoir for fluid under pressure, and provided with a valve, J, opened by the spread of the governor-balls, in combination with the cylinder G, connected with the pipe K, and having side slot, M, and the piston F, connected with the stem D of a throttle-valve, A (J, substan-' tially as herein shown and described, whereby provision is made for the escape of the fluid below the piston when pressure is applied to the lower side of the said piston, and permit ting a change of speed in the engine to cause a fluid to act on the said piston to move a throttle-valve, and thus regulate the speed of EBENEZER HILL.

Witnesses:

O. J. HILL, J. A. SLATER.

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