US1077090A - Pump-governor. - Google Patents

Description

R. B. MQGOWAN.

PUMP GOVERNOR. APPLIOA TIONIILED JUNE 1, 1910 Patented Oct. 28, 1913.

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WITNESSES; 65%,; fiuz B. B. MGGOWAN. PUMP GOVERNOR. APPLICATION TILED JUNE 1, 1910.

1,977,090, Patented Oct. 28, 1913.

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RNEK' To all whom it may concern Be itknown that 1, Roman B. McGowan,-

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MQGOWAN, OF CINCINNATI, OHIO.

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' a citizen of the United States, residing at Cincinnati, in the county of Hamilton and also to provide an independent of the valve structure in continued motion State of Ohio, have invented iiew'and useful Improvements in Pump-Governors, of which the following is a specification.

My invention relates to governors for distributing systems of water, gas or airunder pressure, and is intended not only to regulate and maintain the proper relation between the pressure or motor spied at the supply side of the system and the pressure at the distributing side in order to properly economize the cost of such maintenance, but function of safety and economy by shutting off the supply in case of accident, such for example as the bursting of a distributing main, etc;

In .Patent No. 7 86,984, granted to me on Apr. 11/05, the mechanism shown was dethe result as an incident that the valve by to and beyond the point of its greatest possible opening reached an opposite seat. But besides necessitating a longer valve movement to reach a closure in this direction, the necessity of opening to scribed as attaining "the full capacitywf the admission port, en-

tailing possible disaster to the system and mechanism. In a word the closure in such case. was not a function of the government of the valve-movement, but of its structure and when beyond control. In my present invention the function of governing, the valve-movement is extended to the condit-ion named, in which the movement 0 the valve when the normal adjusted limit of opening is reversed and the valve again seated without any opening of the valve port greater than the predetermined limitwhatever might be the greater physical capacity for opening.

' The concrete illustration of my invention as shown and described herein, is primarily intended as a governing device for steam pumping systems for raising water, 'com-' pressing air, etc., where the pump operates directly against and is intended to maintain r. predetermined head or pressure which is utilized as a force to control and regulate the admission of steam or other force operating the motor; but it may be used with equal advantage in connection with a reducing valve. in a system for the distribution Speciflcaftibn of Letters Patent. Application filed i'une 1, 1910. serial No. 564,464.

probable damage ing two valve seats,

Patented Oct. 28, 1913.

of air or gas to control the supply according to the demands of use.

To the ends indicated,-my invention con sists in an improved mechanism for governing the admission of steam or other source of power to the pump-motor, actuated primarily by the pressure of the varying head or resistance at the distributive side of the system, to thus automatically regulate and economically maintain the supply of motorforce within pre-adjusted dimits; and in mechanism combined and cooperated therewith to independently control and close the valve when the head or resisting pressure falls below the normal workin limit, thereby avoiding useless waste 0% the motor.

My invention is equally applicable as applied in connection with a reducing valve, as for example, in low pressure steam-heating systems.

Mechanism these objects, with certain improvements in constructive details, is illustrated in the accompanying drawings, in which,-

power and through over speeding of for the accomplishment of Figure 1 1s a sideelevation of my improved safety governor complete;-the throttle valve chamber, the pressure cylinder and parts of the frame, being sectioned to show construction; Fig. 2 is a detail elevation showing the position of the bell cranks and connected parts when the throttle valve is closed through abnormal deficiency of resisting head or pressure in the distribution system; Fig. 3 is a. detail showing a modified structure of the cross-heads with rovision for easing the seating action of the throttle valve; Fig. 4 is a perspective view of one of the bell cranks, detached; Fig. 5 a detail cross section on the line m-a: of Fig. 2; and Fig. 6 a detail, is a perspective of one of the forked controller blocks with its set screws detached.

Referring now to the drawings, natesthe throttle valve chamber, contain- 2, in the same vertical axis, governed by a double-disk balanced valve 3. Surmounting the valve chamber as a base is a frame 19, which in turn serves as the support of a pressure cylinder, 29,

1 desigreceiving pressure according to the' head or pressure of water or air, and utilized as the governing force to regulate the operapiped to the ultimate distribution tank and I separation. They are scopically, in a corresponding ,and, extending over upon and secured at resisted by the tension of'the .33 laterally slotted of which at both of that at the Phillip The valve 3 by means oil nvalve rod,

' will he more fully explained herein.

Operating to uphold the piston, 34, against the head-pressure within the cylinder 29, is a coiled spring, 35, in the lower end of the cylinder surrounding the rod 15, hearing upwardly against the piston 34. The spring rests at bottom upon a spring plate, 32, which surmounts an adjustable sleeve, 20, surrounding the piston rod, 15,.

and threaded through a boss upon the upper endof the frame'19, which constitutes the lower head of the cylinder 29. At its lower projecting end, the sleeve 20 is squared or otherwise fitted for the application ofa tool to regulate by its rotation the force of the spring 35; and ,a setnut 22 upon the sleeve impinges against the lower end 01" the boss to secure fixity of its adjusted position.

The upper and lower cross-heads are extensions, enlarged in diameter, of the piston rodfil5 and the valve rod 14, respectively, and are normally in contact, but capable of normally held in contact by a spring 36 secured at one end to and coiled around the lower cross head 37, the other end to the upper cross head 38, in corresponding spiralg'rooves of the latter, so that the separation of the two is spring 36. To preserve alinement of the cross-heads the upper one. 38, is provided with a lower extension of reduced diameter, seated tele- V aperture of the lower one, '37, so that while the two; cross heads may beseparatcd uponbccasion, the "guiding; contact of one with the other is never lost. The upper cross head centrally through its and zone and a pin, it, is inserted through the slot and its side walls. Through said from opposite sides, and pin in common, are inserted ally slotted ends of the long arms, 39, oftwo bcll cranklevers, 39, 'each has a fulcrum pivot, 39 projecting its sides into horizontal 'guideways if? formed in lateral ontensions, 19,

oflhc frame 19, by which the bell crank is permitted a pivotal. movement as well as a lalcrallzavcl in thc guidcway supports. 'llhe short arm, 3!) of cell bell crank is l.,- 1l'm'cated to re eive u'pon pivotal connection a connecting arm 40, thc two extending couvcrgently downward into corresponding l I the side inlet 1 crease of pressure in the in the distributing and, to prevent such results and pivotal connections with lateral bracket extensions, 37 of the lower cross head 37. Set screws, 41, terminating in a button, 41, are threaded horizontally inward through the ends of the side extensions, 19 of the frame 1.9,bearing against suitable forked controller blocks, 45, the forks of which are fitted to the fulcrum pivots, 39, ofhell crank 39 to limit their outward travel upon the guides.

The operation of the device as thus con structed is as follows: Steam is admitted by of the valve casing l, and, as permitted and regulated passes outward through the bottom exit, 1*, ot the valve chamber,

to the steam cylinder of the pump. The spring 35 in the presadjusted. by means of sure cylinder 29 is the tension sleeve 20 to allow ,a-suiiicient opening of the valve 3 to maintain a predetermined head-or pressure in the cylinder 29, under normal conditions of steam pressure. Any increase f resisting pressure in said pressure cylinder 29, above the predetermined limit, ed to resist, will force the. piston rod 15 and its connections and valve'3 downward and correspondingly lessen the flow of steam to the, steam cylinder of the pump, Upon de-' pressure cylinder 29, the piston 34 will rise by the tension of the spring 35, elevating the piston rod 15,

upper cross head 38, and also (through the tension of the the lower cross head 37, valve rod 14; and

connecting spring 36) elevate the valve 3, thus increasing the steam admission to the steam cylinder of the pump ;-a ll in proportion to the decrease of pressure in the pressure cylinder 29. There is thus maintained, under normal conditions, a perfect balance and a uniformhead tank or system. Now, should the said resisting head or pressure through any accident or other abnormal condition, continue to decrease, notwithstanding 7 the maintenance of maximum steam pressure at the pump, the result without any further provision for ernment, wouldv be overspeeding to the steam govand injury working parts and pipe connections,

v insure safety, I have provided the other mechanism specified, whose functions are now to be described. Should the'pressure in thepres sure'cylinder '29 continue to decrease, the continued lifting action of the spring 35 elevatesthe piston rod 15, cross head 38, and also by means of the pin 44, raises the long horizontal arms, 3930f bell cranks 39, forcing the fulcrum pivots 39 outward in theirguideways until they contact with their adjustable controller blocks 45. The

' of the upward move- 38, however, produces turth or "continuation ment of the cross head a proper pivotal action of the bell crank which the spring is adjustl by the valve 3,

. a cap or 1s a spring -dition thereto, of a safety abnormal conditions, such as erates is directly related to the consumption in the distribution system, the proper gov- .10, and continued until the required workand desire to seof the United stationary fulcra, and the connecting rods to are forced downward, separating the cross heads, moving the lower 'crosshead 37 downward against the tension of the spring 36, carrying the governing/valve 3 to its seat and shutting down the pump action, Thus the governor as a whole possesses the function not only of a regulater-of the ordinary working action of the pump under normal conditions, but, in addevice in case of breaking of upon its now I claim as my invention, cure by Letters Patent States p 1. In a system of fiuiddistribution of the character indicated, in combination with a governing valve for regulating the motor force at the supply side of the system, and with mechanism for operating said valve to adjusted working limits less than the valve capacity by means of the varying head or pressure at the delivery side of the system, otauxiliary mechanism connected therewith adapted to reverse the direction of valve operation and close the valve when the depipe connections, etc.

Since the speed at which the pump opthe normal working limit as adjusted.

2. In a system of fluid-distribution of the character indicated, the combination of a piston under continuous pressure of resistance at the delivery-side, acting in one.dimotion of the piston-movement, and continuous spring-pressure acting in the other direction, a regulating throttle-valve governing the supply of motor force at the supply-side of the system; mechanism connecterning of its action under normal conditions described, results in economy of steam; and the further regulation under abnormal conditions, reducing the outward pressure, not only prevents useless waste of steam, but insures against disaster. Should the stoppage be temporary, and the normal premure within working limits, resumed within the system, the action, of the pump will be automatically resumed; otherwise steam may be admitted by the by-pass valve limits of the resisting mechanism operated by said piston when the resisting pressure decreases below the normal limit to move the valve oppositely to the piston-movement and seat the valve.

3. In pump governing apparatus, the combination of a governing piston actuated in one direction by the head or pressure of fluid supplied by said pump, and in the opposite direction by spring-pressure adjusted to a normalmaximum pressure of said fluid, a throttle-valve actuated correspondingly within predetermined limits, and a divided connecting rod, normally connected as one, uniting the valve and piston, but adapted to separate and allow the throttle valve to be closed when the governing pressure talls below the proper limit.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

pressure is reached, at which point the device resumes automatic control.

In Fig. 3, I have shown a slight modification. of the mode of connecting the socalled cross heads which is intended toease, the seating of the throttle valve and prevent injury thereto. The lower cross head 37 is counterbored. leaving: a lower head through which the valve rod 1& enters, and is held by head 14 at the upper end of the same. Coiled within the counterbore and seated upon said head 14: of the valve rod 42 which is heldin compression by an adjustable threaded plug 43, forming the lower guide for cross head 38. These changes of structure effect no change of operation excepting that the valve 3 in any downward movement, will seat without un-. due stress by weight of parts above, and also the adjustment of the downward moving parts need not be so exact, but the limit of movement may be in excess of that required to seat the valve 3 and thus insure its proper seating when required.

ROBERT B. MoGOlVAN. lVitnesses \VAn'ren A. KNIGHT, Anion L. TlLnnsnnr.

crease of resisting head or pressure passes ing said piston and said valve in simultaneous coordgnate operation between normal head or pressure; and j

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