US417770A - collom - Google Patents

Description

, 2 Sheets-Sheet l.

M. H. COLLOM.

SPEED GOVERNOR.

170.417,770. ,Patented Dec. 24, 1889.

` UNITED STATES PATENT OFFICE.

MARTIN H. COLLOM, OF DENVER, COLORADO, ASSIGNOR TO THE OOLLOM STEAM PUMP GOVERNOR COMPANY, OF SAME PLACE.

SPEED-GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 417,770, dated December 24, 1889. Application filed April 6, 1889i Serial No. 306,210. (No model.)

T a/ZZ whom t 77mg concern: fect control of the steam-supply is maintained. Be it known that I, MARTIN H. OOLLOM, of Should the water-supply fail and the pump Denver, in the county of Arapahoe and State merely suck air, the main valve will remain of Colorado, have invented a new and usei'ul-y closed, because, there being but little resist- 55 Improvement in Speed-Governors1 which imance to the motions of the pump-cylinder, but provenient is fully set forth in the following little steam will be called for, and this the SDGCCWDOH by-pass valve will secure.

My invention has reference to speed-regu` The invention includes certain special fealators particularly designed for steam-pumps, tures of construction and combinations of 6o 1o though the improvements may wholly or in` parts, as hereinafter described.

v part be applied to other purposes, as will' Referring to the accompanying drawings, readily be understood by those skilled in the which form part of this specification, Figure art to which the invention relates. I is a horizontal section of a regulator con- The object of the invention is to furnish a structed in accordance with the invention; 65

regulator which maybe used as an attachment Fig. Il, a vertical section through the main to steam-pumps whether new or already in valve on line Il, Fig. I; and Fig. III,4 a vertiuse, which will supply to the piston just the cal section through the governor-cylinder on amount of steam necessary to do the work reline Ill, Fig. l. quired and no more, and which will auto- The chamber A, approximately spherical 7o 2o matically cut off the supply of steam and in form, is adapted to be connected in the slow down the speed of the piston in case of steam-pipe at any suitable point between the failure in the supply of water or other liquid, boiler and pump, the steam entering at aand thus preventing the pump from running away discharging at b. The main valve, which is and avoiding the damage that would result inclosed in said chamber and controls the 75 EheleflOHlpassage of steam to the discharge-pipe b,con

In carrying out this invention the steamsists of a rod or plug B, adapted to move in supply pipe is provided with a main regulata transverse opening through said pipe b, ing-valve, which in its normal position or powhich is closed at the upper end, as shown, sition of rest closes said pipe. The valveand provided with crossheads C and caps D 8o 3o stem of this main valve is connected withand D', which constitute the valves proper, and operated bya pressure-actuated device, which are normally pressed by springs d against may be a piston working in a suitable cylinvalve-seats e. The plug B is provided with der connected by pipes with either the steam wings E, the spaces between which allow the or water cylinder Vof the pump, but prefersteam to pass freely when either cap D or D 85 3 5 ably with the former. The main valve being is open. Gap D has a guide-stem f, which normally closed/the pump is run ata minimum plays in a hole in screw-plug g, which closes speed under light duty bya small amount of the side of the chamber. Cap D can slide on steam supplied by a suitable by-pass valve. the rod F, to which plug B is connected, and When, however, the steam thus supplied is which passes through a stuffing-box in the 9o 4o insufficient to move the piston against the side of chamber A. It will be noted that in pressure opposed to it, the pressure accumuthe position of the parts as shown in the lates behind the pump-piston and is immedidrawings, (which is the normalpositiom) the 4ately communicated to the valveactuating main valve is closed; but if the rod F moves piston, causing it to open the main valve and inward cap D will be lifted, (cap D remain- 95 pass the amount of steam required to operate ing closed,) allowing steam to enter pipe l) the pump-piston. As soon as the pump-cylfrom chamber A. lt rod F moves outward, inder exhausts at the end of each stroke, the cap D will be lifted in like mannen It will Vmain valve at once returns to its normal po-- also be noted that if the valve be open on sition, cutting off the steam. This closing of either side it must be fully closed before it roo 5o the main valve at each stroke is an important can open on the other.

feature of the invention, since thereby per- G represents a small by-pass valve in pipe b, through which a certain regulated amount of steam is supplied to the steam-cylinder. Stem g of this valve is threaded and passes through'a threaded boss in the Wall of chamber A, so that by turning said stem the size of the valve-opening can be regulated.

The main valve is actuated by the governor-piston H, which works in a cylinderI alongside of the valve-chamber A. The rod 7L of this piston-is connected with the stem F of the main valve by a lever K, pivoted atv lc in an adjustable fulcrum piece or bracket L. Said fulcrum piece or bracket is made adjustable, so that the motion imparted to stem' F from rod h may be made relatively greater or less, as desired.

Piston H normally (fi. e., when the main valve is closed) rests at about the center of cylinder I, being controlled by the springactuated rod M, with which piston-rod h is connected at each end by bars m, so that the piston H follows the motions of said rod. Rod M is supported in openings in lugs n, which are part of the casting of cylinder I, said rod being provided with sleeves 0 o' fixed thereon. Sleeve o is of such size as to t loosely in the opening4 in one of lugs n aforesaid, while sleeve o fits in a compression-nut O, which is screwed into the other lug. Collars p p are mounted loosely on rod M, and between them is a spiral spring N, which bears at opposite ends against said collars. Any movement of piston H will compress spring N in one direction or the other, and when the force-moving piston His withdrawn said spring will return the parts to their normal position.

The pipes q q connect cylinder-I with either the steam or water cylinder of the pump and are provided with ordinary plug-valves r. The pipes q q communicate with opposite sides of the gov ernor-pist'on H, and their other ends are likewise connected with opposite sides of the pump-piston.

The operation of the regulator when connected with the steam end of the pump is as follows: The by-pass valve G is opened far enough to furnish sufficient steam to run the pump at a minimum speed and under the' lightest duty. So long as this valve passes sufficient steam to overcome the pressure opposed to the working-piston, the main valve remains closed; but whenever the water-pressure is above this limit the speed of the pumppiston is checked and steam begins to accumulate behind it. This pressure is communicated by one of the pipes q to the correspending side of governor-piston H, forcing the latter from the center of its cylinder I toward one end thereof, carrying with it rod M, and thereby compressing spring N. The motion of piston H is communicated through lever K to the stem F of the main valve, which thereupon moves off its center, opening either cap D' or D and allowing the requisite quantity of steam to pass into pipe b. The pump-piston is thereby moved to the end of its stroke and the cylinder exhausts, relieving the pressure in governor-cylinder I and permitting the pressure of spring N to return piston H to its normal position, thereby closing the'main valve. It may be that on the return-stroke of the pump-piston more steam will be required than is supplied by the by-pass valve, when the same operation will be repeated, except that the main valve will moye in the opposite direction. So long as this condition continues, the governor-piston (and consequently the main valve) will move back and forth with each stroke of the pump-piston; but the main valve closes at each reciprocation, thus cutting off and renewing lthe supply of steam at each stroke of the piston in such quantity as may be necessary to move the latter. Should the conditions of workin g suddenly change-as, for example, by the supply of water giving outthe main valve would remain closed, since the steam supplied through the by-pass valve would run the pump-piston so fast as to prevent accumulation of pressure. By attaching the pipes q q to the water-cylinder of the pump the action would be the same, the piston H in that case being operated by water instead of steam. On account, however, of the grit and sediment conta-ined in the water it is preferable to connect the governor-cylinder with the steam end of the pump.

To connect the regulator with steam-pumps already in use, it is only necessary to tap the main steam-pipe and connect chamber A therein, and to connect the steam lor water cylinder with the governor-cylinder I by the small pipes q.

It is obvious that modifications may be made in the details of construction shown and described without departing from the spirit of my invention,and that parts thereof may beused without the whole.

Having now fully explained the principle of my invention and the manner in which the same may be practically carried out, what I claim, and desire to secure byLetters Patent, 1s-

l. In a regulator, the combination, with a steam-supply pipe, of a balanced valve normally closing said pipe, but adapted to open by motion in either direction, a valve-actuating device or piston, a chamber or cylinder therefor connected on both sides of said piston with the steam or water cylinder, and a spring tending to close the main valve, so that said main valve must completely close after each stroke before it can open to supply the steam for the succeeding stroke, substantially as described.

2. The combination of the normally-closed balanced main valve, the governor-piston and .cylinder for actuating the same, and the bypass valve, substantially as described.

3. The combination, with the balanced main valve and the by-pass valve, of the governorcylinder provided with pressure-communicating pipes at each end of the governor-piston,

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a spring holding said piston normally at about the center of said cylinder, and a lever connecting the rod of said piston with the stem of the main valve, substantially as described.

4. The combinatio11,with the governor-cylinder and piston adapted for operation by variations of pressure, of a balanced valve seated in the supply-pipe and normally closing the same, but adapted to open in either direction, connections between said piston and said valve, a spring controlling` the positions of said parts, and a by-pass valve in said supply-pipe, substantially as described.

5. The combination, With the pressure-actuated governor-piston, of a normally-closed balanced valve in the supply-pipe, said Valve comprising' caps normally closing` ports on opposite sides of said pipe, a valve-stem and cross-heads ltlnereon adapted by the motion of said stem to unseat one or the other of said caps, substantially as described.

6. The combination of the normally-closed balanced main Valve adapted to open by Inotion in either direction, the by-pass valve, the governor-cylinder having pipes for connection with the steam or Water cylinder, the piston of said governor-cylinder, an actuat-^ ing rod connected With the piston -1'od, a spring` surroundingI said rod and adapted to be compressed by thelatters motion in either direction, and a lever connecting the rod of the governor-piston with the vmain valvestem, substantially as described.

In testimony whereof I have signed this specication in the presence of two subscribing` Witnesses.

MARTIN H. COLLOM.

Witnesses:

B. D. ALLEN, ORLANDO KLING.

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