US950737A - Electric pump-governor. - Google Patents

Description

W. V. TURNER. v

ELECTRIC PUMP GOVERNOR. APPLICATION FILED MAY 15, 1907;

Patented Mar. 1, 1910.

2 SHEETS-SHEET 1. I

Atty.

ENTOR W. V. TURNER. ELECTRIC PUMP GOVERNOR. APPLICATION TILED MAY 15, 1907.

950,737. Patented Mar. 1, 1910.

2 SHEETS-SHEET 2.

Attfy.

of fluid to the actuating this slow movement,

UNITED STATES PATENT OFFICE.

WALTER V. TURNER, OF EDGEWOOD, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, OF PITTSBUBG, PENNSYLVANIA, CORPORATION OF PENNSYLVANIA.

ELECTRIC PUMP-GOVERNOR.

Specification of Letters Patent.

Patented Mar. 1, 1910.

Application filed May 15, 1907. Serial No. 373,727.

To all whom it may concern:

Be it known that I, WALTER V. TURNER, a citizen of the United States, residing at Edgewood, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Electric Pump-- Governors, of which the following is a specification.

This invention relates to pump governors, and more particularly to governors for electric motor driven pumps, wherein the main controlling device, or switch, for opening and closing the circuit to the motor .for driving the pum is operated according to the pressure pro uced by the pump.

My invention is directed mainly to pump governors, wherein an actuating piston is employed for throwin the controlling -device, or switch, to its dilferent positions, for cutting the pump into or out of operation, and having means subject to pump pressure for controlling the supply of fluid to and its release from the actuating piston.

In pump governors of this class it has heretofore been proposed to provide means adaptedto suddenly supply fluid to and release fluid from the actuating piston, so that said piston will move from one position to the other with a quick, snap-like action, to cause the desirable rapid and sudden shiftin of the controlling device, or switch.

evices of this character have been constructed, which operate very satisfactorily, but it sometimes mechanism for controlling the admission piston, moves slowly at first, so that fluid does not flow thereto, insufficient volume to eflect the desired quick movement of the actuating piston to the opposite end of its stroke, and is apt to, give time enough to permit of arcing between the fixed and the movable contacts of the electric switch, thereby burning the contacts more or less. 1

The principal object of my invention is, therefore, to obviate the above difficulty, and for this purpose my invention comprises in general, a valve mechanism operated by pump pressure, for supplying fluid to the actuating piston, and means operated by the preliminary movement of said piston, for also supplying fluid thereto.

Other features of my invention relating to the improved operation of electric pump '6 a plan view of the seat happens that the valve The piston heads may governors, will be hereinafter more fully described and pointed out in the claims.

In the accompanying drawings; Figure 1 is a diagrammatic view, showing one form of pump governor embodying my invention, and connected up to a pump and reservoir; Fig. 2 a central sectional View of the pump governor shown in Fig. 1; Fig. 3 a diagrammatic view, showing another form of pump governor embodying my invention and connected up to a pump and reservoir; Fig. 4 a central sectional view of the pump governor shown in Fig. 3; Fig. 5 a face view of the slide valve for controlling the supply ports to the actuating piston, as applied to the construction shown in Fig. 2; and Fig. for the above slide valve, showing the arrangement of ports.

According to the apparatus shown in Figs. 1 and 2, the construction comprises an electric motor driven pump 1, for compressing air or other fluid through pipe 2, into a reservoir 3, which is connected by a pipe 4 to a pump governor 5. The pump governor, in this instance 'comprisesa casing 6, having a cylindrical chamber 7, containing an actuating piston 8 for rod 9, carrying the movable art of an electric switch, having contact bars 10 and 11, adapted to make contact stationary contacts 12and 13 respectively, of an electric circuit 14, for supplying current to the motor driven pump 1.

The actuating piston 8 is operated by the opposing pressures of a spring 15 and fluid under pressure, the admission and release of which to one SIdBOI said piston isv governed by a valve device contained in a cylindrical chamber, and comprising a double piston 17, having heads 18 and 19, operating respectively in chambers 16 and 21, and a slide valve 20, adapted to be actuated thereby.

loosely fit in the cylindrical chamber, or may be provided with equalizing port-s, so that fluid pressure may equalize rom the valve chamber to the pis ton chambers 16 and 21.

The high tension regulating device for controlling the pressure on the outer face "of the piston head 18,-co1npriscs a diaphragm 22, subject to the opposing pressures of an adjustable spring 24: and fluid pressure in chamber 23, and controlling a valve 25, which governs the release of fluid under pressure from the chamber 23 to the exhaust port 26, leading to the atmosphere. In the with shown in Fig. 2, the

,and 11 of the electric passage 27, cutting cut in position of the pump governor, as I of fluid to the regulating chamber 23, so

through passage 27, cavity 28 in slide valve 20, and passage 29, to chamber 16 and the outer face of the piston head 18.

The low tension regulating device for con trolling the pressure on the outer face of the piston head 19, comprises a diaphragm 30, subject to an adjustable spring 31, and the fluid pressure in a chamber 32, for control ling a valve 33, which governs the release of fluid under pressure from a chamber 34, to an exhaust port 35.

The chamber 34 communicates through a passage 35 and a port 36, controlled by a valve 37 provided on the piston head 19, With chamber 21, at the outer face of the piston head 19.

In operation, the operating springs 24 and 31, beingadjusted to the desired high and low pressure degrees, respectively, air from the reservoir 3 flows through pipe 4 and passage 38, to the valve chamber between the piston heads, and equalizes into the piston chambers 16 and 21. Air also flows through passage 29, cavity 28 and passage 27 to the. high tension valve chamber 23, and when the fluid pressure therein exceeds the limit for which the spring 24 is set, the diaphragm 22 is actuated and opens the release valve 25, and fluid is thereupon vented from chamber 23 and piston chamber 16, the fluid pressure on the outer face of piston head 19 will then shift the piston and main slide valve. In the preliminary movement of the main slide valve, a port 39, which opens into a passage. 40, leading to the chamber below the actuating piston 8, is first uncovered.

When seated in its lower position, the actuating piston 8 closes the passage 40, so that the fluid pressure therein has no effect on the actuating piston, but on further movement of the main slide valve 20, a supply port 41 is uncovered, and fluid under pressure flows through a passage 42, to the exposed face of the piston. The piston is thereupon actuated, and uncovers the pas sage 40, thereby admitting to the face of said piston a large volume of fluid, the passage 40 being Wide open. In response to the large supply of fluid thus admitted, the ac tuating piston and the movable contacts 10 switch, move with snap-like rapidity to the cut out position. It will be obvious that a'very slight move ment of-the actuating piston will open the passage 40, so that a qulck action is assured, even should the port 41 fail to be fully opened, as might be the case, should the main slide valve move very slowly or stop when the port 41 is partly open. The movement of the piston and main slide valve 20, is limited by a stop 43, and when in position engaging said stop, the main valve 20 closes off the further supply -sudden release of chamber 23 is open ,that the release valve 25 will then close posithe main 1 tively, and all possible dribbling or leakage will be prevented. The valve 37 is unseated in this position, so that chamber 32 and the diaphragm are open to pump pressure, and when the pump pressure becomes reduced to that for which the low pressure spring 31 is set, the diaphragm is actuated by the spring and opens the valve 33, releasing fluid from piston chamber 21, through the passage 35 andchamber 34, to the exhaust port 35. The fluid pressure, which has equalized into the piston chamber 16, Wlll then shift the piston and main slide valve 20, to a position in which the large port 41, leading to passage 42 and the actuating piston, is connected to a by a cavity 45 in, the slide valve 20. "he pressure thereby produced, permits the spring 15 to quickly move the actuating piston and the contacts 10 and 11 to their inner position, in which the electric circuit 14 is completed, and the pump set into-operation. The valve 37 closes the port 36 and passage 35, preventing further release of fluid, and communication is again established from chamber 16 through pas sage 29, cavity 28 and passage 27 to the high tension regulating chamber 23.

In Figs. 3 and 4, I have illustrated my in vention as applied to another form of pump governor, wherein one regulating diaphragm directlycontrols the movement of the slide valve for governing the fluid pressure on the actuating piston. In this instance a diaphragm 50, subject to the pressure of an adjustable spring 51, on one side, and to reservoir pressure on the other, through pipe 4, is adapted to,actuate the slide valve 52, contained in the valve chamber 53, open to the reservoir through pipe 4. The other parts of the construction may be the same as those described in connection with Figs. 1 and 2.

In operation, the spring 51, being adjusted to the desired high tension, when the pump pressure in the valve chamber 53 and on the diaphragm exceeds the pressure of the spring 51, the diaphragm moves the main slide valve 52, 40, thereby admitting fluid thereto, but the passage being closed by the actuating-piston 8, there is no movement of the piston. On further movement of the slide valve, :1 port therein, registers with the passage 42, which is in open communication with the face of the actuating piston 8, and fluid from the reservoir then flows to the actuating piston 8, Which is thereby moved, and at once opens the admission port 40, and, in the same manner as before described, the actuating piston is thereby suddenly shifted to its outer seat, opening the electric circuit 14 to the pump. l Vhen the reservoir pressure'belarge exhaust port 44,

and uncovers passage I claim as new, and desire to secure by Letto open said port.

tion, nlosing the passage 40 and completing the electric circuit 14: to the pump.

Having now described -my invention, what ters Patent, is

l. A pressure governor, comprising a controlling device and actuating piston, a valve mechanism operated by pump pressure to admit fluid to said actuating piston, and means governed by said piston for also supplying fluid to operate the piston.

2. pressure governor, comprising a controlling device and actuating piston, a valve mechanism operated by the rise in pump pressure to a'predetermined point, to sup ply fluidto said actuating piston, and means operated by the movement of said piston for also supplying fluid thereto.

3. A-pressure governor, comprising a controlling device and actuating piston, a valve mechanism operated by a variation in pump pressure to first open communication from a source of fluid pressure to a port controlled by said piston, and thenadmit fluid to said piston, thereby actuating said piston i. A pressure governor, comprising acon' trolling device and actuating piston, a valve mechanism operated by pump pressure for controlling two ports for varying the pressureon said actuating piston, one of said ports. being also controlled by the movement of said actuating piston.

5. A pressure governor, comprising a controlling device and actuating piston, a-valve mechanism operated by variations in pump pressure for controlling the admission of I fluid to and its release from said actuating piston, and means controlled by said actuating piston for also supplying the fluid for operating said piston.

6. A pressure governor, comprising a controlling device and actuatingpiston, a valve devlce for varying the pressure on said actuating piston, and means governed by ump pressure for operating said valve evioe, said valve device being ada ted to control the admission of fluid to sai means.

7. A pressure governor, comprising a controlling device and actuating piston, a valve device for varying the pressure on said controlling piston, and means governed by pump pressurefor operating said valve device, said valve device being adapted in one position .to cut off the admission of fluid under pump pressure to said means.

8. A pump governor, comprising a con trolling device and an actuating piston, and a valve mechanism operated by an increase in pump pressure toa predetermined point, to actuate said piston and thereby open a port for supplying fluid to said piston.

9. A pump governor, comprising a controlling device and an actuating piston, and a valve mechanism operated by an increase in pump pressure to a predetermined point, for supplying air to said actuating piston and for opening a port adapted to supply a large volume of fluid to said actuating piston, following upon movement of said actuating piston from its seat.

10. In a pressure governor for pumps, the combination with a controlling device a-ndan actuating piston therefor, of a valve mechanism governed by the pump pressure for controlling the supply flllld to said actuating piston, and means operated by the preliminary movement of said piston for also supplying fluid thereto,

11. In a pressure governor for pumps, the combination with a controlling device and an actuating piston therefor, of a valve mechanism operated by a rise-in pump pressure' to first open communication from a source of fluid pressure to a port adapted to be opened by the preliminary movement of said actuating piston, and then admit fluid to and thereby move said actuating piston.

12. In a pressure governor for pumps, the

combination with a controlling device and an actuating piston therefor, of a valve mechanism operated by pump pressure to supply fluid to, and'thereby move said actuatm piston, and means, operated by the prelimlnary movement of said valve mechanism, for admitting fluid to a port adapted to be opened by the preliminary movement of said actuating piston. I

In testimony whereof I have hereunto set my hand.

WALTER V. TURNER.

Witnesses:

R. F. EMERY, WM. M. CADY.

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