US669274A - Pump-governor. - Google Patents

Description

Patented Mar. 5, |90I. A. F. WARD.

PUMP GOVERNOR.

(Application filed May 14, 1900.)

(No Bladel.)

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SPECIFICATION forming' part of Letters Patent No. 669,274. dated March 5, 1901.

Application filed May 14| 1900. .serial No. 16.671. (No model.

To tZZ whom, it Wtcty concern:

Be it known that I, ALEXANDER FIELD VIARD, a citizen of the United States, residing at Memphis, in the county of Shelby and State of Tennessee, have invented certain new and useful Improvements in Pump-Governors, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to governors especially designed for use in governing the speed of steam-pumps; and the invention consists in the peculiar combination of a cut-off, an actuating connection between said cut-olf and the moving part of the pump-motor, a counter-motor, and adash-pot, as more fully hereinafter described and claimed.

The invention further consists in the peculiar construction, arrangement, and combination of parts, as specifically set forth in the claims.

In the drawings, Figure l is a longitudinal section through the governor, and Fig. 2 is a longitudinal section in a plane at right angles to Fig. l and partly in section.

In the construction shown in the drawings I have shown all the parts of my governing device as connected to and supported by the steam-pipe leading to the pump, thus dispensing with the necessity of providing a separate framework.

In this construction,A designates the steampipe. At a suitable point in this pipe is connected the casing B, having a central diaphragm a, dividing it into two chambers bc. At one side of the casing B is a cylinder C, preferably formed integral therewith and containing the piston-valve D. The cylinder C is connected by an annular port d with the chamber b, and the valve D is provided with a corresponding port e, adapted to register with the port d in the normal position of said valve. The port e connects with the central passagef in the valve, which communicates with a chamber g at the end of the cylinder C, which chamber is connected by a port h with the chamber c in the casing B.

E is a valve-rod connected to the valveD and passing out through a stuffing-box F at the end of the cylinder C.

G is a bracket clamped or otherwise secured to the pipe A, and H is a rock shaft journaled in this bracket.

I is a rock-arm secured to the shaft H, and .I is a link pivotally connected to the outer end of said rock-arm and extending in line wit h the valve-rod E. Between the link .I and the rod E is interposed a dash-pot J', which is preferably of the following construction:

1l is a cylinder pivotally connected by ears j to the link J. k is a piston in this cylinder which is connected to the opposite end of the rod E, which rod passes int-(fthe cylinder through a stuffing-box Z, formed in 'the cap or head m. The opposite ends of the cylinder are connected with ports n ando, which connect, respectively, with the end and side of a cavity p, in which is arranged a rotary plug q. This plugis provided with a port or passage fr, which in one position of the plug will register with the ports n and o, so as to form a continuous passage or b v-pass extending from one end of the cylinderto the opposite end.- The plug q has a stem q passing out through a cap s. Upon opposite sides of the cylinder are arranged guide -rods K, which at one end are connected with a bracket G and at their opposite ends to a bracket L, also preferably clamped or otherwise secured to the steam-pipe A. The cylinder i is provided with apertured ears t, which slidingly engage with said guide-rods.

M is acollar secured to the rod E. Upon opposite sides of this collar and bearing thereagainst are springs N and O, which at their opposite ends bear against abutments P and Q. The abutments Pand Q are preferably adjustably secured upon the guide-rods K by means of the nuts or threaded collars R on said rods.

The bracket L is preferably provided with a cylindrical casing u, which surrounds the springs N and O, and within this casing is an annular ange or collar U, forming a stop limiting the movement of said springs.

The parts being constructed shown and described, in the use of the device as a governor for pumps the pipe A is connected to the steam-cylinder ofthe pump. From some moving part of the pump (not shown) a connection R' is made to the rock-arm R, connected to the rock-shaft H, so that in the nor- IOO mal operation of the pump a rocking movement will beimparted to said rock-shaft and through the link J to the cylinder t'. The space Within the cylinder z', as well as the bypass, is filled With a liquid, such as oil,`so that Whenever there is a relative movement between the cylinderand the piston 7c therein said liquid or oil is compelled to travel through the by-pass from one end of the cylinder to the other. By means of the plug q the flow of oil through this pipe may be restricted to a greater or less degree, so as to govern the time required for the piston to travel from one end of the cylinder to the other. For the normal operation of the pump this plug is so set as to permit of a relative movement between the cylinder and piston equal in speed to the movement of the link J, attached to said cylinder. As the springs N and 0 tend to hold the rod E and the piston 7c, attached thereto, stationary, it is obvious that Where the speed of the pump is normal said rod and piston may remain practically stationary, while the cylinderz' will be reciprocated by the link J. In this position of the rod E the cut-off valve D will remain in a position where the ports e are in registration with the ports d in the cylinder C, so as to form a free passage for the steam entering the chamber b of the casing B through said ports and valve into the chamber cand thence through the pipe A to the cylinder of the pump. As soon, however, as the speed of the pump is increased the oil in the cylinder 'L' of the dash-pot will not be enabled to travel through the restricted by-pass fast enough to permit of the piston 7c remaining stationary. Thus said piston will be moved against the tension of one of the springs N and O, which Will canse a shifting of the valve D to partially or completely cut oft' the steam. This of course will slow the operation of the pump, and as soon as the latter drops to normal speed the springs will restore the valve to its normally open position.

While I have shown and described a speciiic construction of my governor, it is obvious that the parts might be ditl'erently arranged Without departing from the spirit of ,my invention.

What I claim as my invention isl. A governor for a fluid-motor, comprising a out-olf valvein the Huid-supply conduit, avspring for yieldingly holding said cut off valve in its open position, a reciprocating member actuated by the motor connected to said valve, and a dash-pot in said connection.

2. A governor comprising a pipe or conduit forcondu'cting the motive agent to the motor, acasing connected into said conduit, a pistonvalve at one side of said casing controlling the passage of the motive agent therethrough, a rod connected to said valve extending parallel to said conduit a dash-pot having one member thereof connected to the opposite end of said rod, a reciprocating member actuated by the motor, connected to the other member of said dashpot, guides for said dash-pot connected to said cond uit,a coil-spring su rrounding said rod between said guides having an abutment secured to the latter and being adapted to yieldingly hold said rod with the valve in its open position, substantially as and for the purposev described.

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

ALEXANDER FIELD WARD. Witnesses:

MILTON BROWN, CHAs, SIMON.

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