US1569897A - Automatic regulating means - Google Patents

Description

Jan. 19,1926. 1,569,897

C. M. TERRY AUTOMATIC REGULATING MEANS Filed March 26, 1925 Patente! 311.19, 1926.

UNITED STATES PATENT. O FFlcI-z.`

cHAELEs 11T. TERRY, or D ECA'IUB, ILLINoIs, 'AssIGNon To A. w. cnsnconrm.

. or DEcA'rUE, ILLINOIS, A conroEA'rIoNor DELAWARE.

AUTOMA/'IIC REGULATING Si.

'Application inea March ze, 1925. serial No. 18,352. i

To all 'it may concern:

Be it known that I, CHARLES M. TERRY, 'a citizen of the United States, residing at Decatur, in the county of Macon and Statev of Illinois, have invented certain new and useful Improvements in Automatic Regulatin Means, of which the following is a speci cation.

My invention relates to automatic regu-l lating means, responsive to pressure variations, for controlling adjuncts (such as blast or stack dampers, fan or stoker feed drive mechanism, etc.) of a steam boiler furnace equipment or the like to maintain the desired operating conditions, and more particularly has4 todo with the valving device for controlling the position of the piston structure of the fluid operated motor under the control of the pressurel responsive element of the apparatus. The main object of my invention is to'so form the escape ports of the valve device that they direct the jets or streams of motive fluid in such directions that they do not interfere with the operation of the valve and do not cause leakage in the wrong direction through or past the valve member/,forcontrolling the extent of opening of the ports.

In the accompanying drawings I have shown my invention applied to the type of Iegulator shown and described in my copending application'Serial No. 707,314, filed April- 17, 1924, to which luy-present invention is peculiarly adapted for application,

although it will be evident that the invention may be used in other kinds and types of regulators and therefore I do not intend to limitthe use of the invention to the particular type of regulator disclosed herein.

In said drawings, Figure 1 is a vertical cross-section through my improved regulator, and Fig. 2 is an enlarged detail taken through part of the piston structure and the sleeve or engine valve.

Referring to Fig. 1, one end cfa cable 5 is connected to the topof a piston rod 6, which is of tubularl construction, and open at its lower end" through the piston 7 ofthe hydraulic or fluid o erated motor. For the sake' of illustration, have diagrammatically shown, on a very reduced scale, the cable as running over suitable guide pulleys and connected at its opposite end to a segment -9, which carries a weight 1'0 and to which is connected a damper 11 in a stack of the furnace to be controlled. The piston 7 tends constantly to rise to the top of its cylinder 13 under the pull ofthe damper weight 10,

but water or other motive iiuid under pres-"s sure flows in a small steady stream into the upper end of the cylinder 13 through a donstantly open port from a pipe 12 and the fluid pressure is employed to overcome or balance the eifect of the damper weight v10. The liquid thus introduced above thepiston 7 can escapev vfrom .the cylinder v 25 through my improved valve controlled ports 14, preferably four in number, formed in the hollow piston rod 6 and controlled by a. slide valve l'mounted within the piston rod.v This valve 15 is in the form of a tube or sleeve, the lower end portion being adapted` to open ports 14 more or less. A pin 17,

extending through the valve, supports av 19, preferably, a ball-chain, with a float 20 positioned in a Ycasing 21. The upper `end of the block 18 is preferably connected by a ball-chain 22 and a suitable stirrup with a valve-opening lever 23 carrying a weight 24 which constantly tends to open the valve 15. Thei lever 23 is suitably pivoted on a bearing head carried by the piston rod and one end ofthe lever passes through suitable slots 24 in the piston rod to permit Inovement of this lever about its pivot. I also connect to the lever 23 a variable weight 26, which is in the form of a chain, `as shown.

The motor cylinder 13 is mounted centrally upon the casing 21 and the base'28 ofv the motor casing forms theupper head of the casing 21 and has a. central openin 27y through which the ball-chain 19 passes. e water that escapes fromthe upper end of the motor through the ports 14 is 'led through a duct 2 9 in the base 28 into the float chamber formed by the casing"` 21.

A pressure communicating pipe 30 opens at one end (not shown) into the combustion ino space of the/furnace and at its other end into the bottom of the casing 21, and has its verticalf pipe-extension 30', withmthe draining through the dra-1n pipe 31.

In operation, the hydraulic motor normally stands in balanced pressure condition, with its piston at such point that the lower portions of the ports 14 are just sutliciently opened by the valve 15 to permit the steady escape of water, through these ports down through the duct 29 into the'float chamber,- e ual to the constant inflow through the p1pe'12. Any rise of pressure in the. combustion space of the furnace is communicated to the interior of the float through the pipe 30 and its extension 30 and raises the float to some degree. The weight 24,

' through the lever 23 and chain 22, raises the valve 15 up higher in the piston rod, lso opening wider the ports 14. This relieves the water pressure 1n the top of the motor cylinder and so the vdamper weight 10 raises the piston rod up around the float-restrained valve 15 until the ports 14 are sufficiently throttled to restore the balancing pressure. Should the pressure in the furnace drop, the reverse action takes lace, as the float 20 sinks to a correspon ing extent, dra ging down the valve 15, which momentari y diminishes the eiective opening of the ports 14, whereupon the-water pressure romptly builds up in the cylinder to force t e piston down until adequate port opening is again established.

It will now be noted that I have formed the lower ends' ofthe slotted rts 14 so thatthey incline inwardly an downwardly. This construction has very decided advantages4 as it directs the "ets of water downwardly, as indicated iagrammatically by the lines 33 in Fig. 2, away from the lower end of the valve 15 and at an inclination toward the lower end of the connecting block1 18. Were the-lower ends of the ports 14 horizontal, the jets of water would be directed horizontally into the piston rod and at rlght angles to the connecting block and with such arrangement, I ind that when the. water above the iston 7 is under high cyllnder pressure and) consequently is passing at high lvelocity through the relief ports 14, the water strikes the block and the streams of water are divided, part of the water being forced up through the hollow valve and the piston rod and out of the slots 24 by the velocity head, and such action is obviously objectionable and to some degree impairs the etliciency of the-device.

With the improvement embodyinr my inventionthese objections are entirey avoid- .edf and. eliminated vas the. jets are directed jdownwardly.

I claim: 1. Ina regulating device of theclass deture, a connection between sai `motor having a piston with a hollow piston rod, a sleeve valve slidable in said piston rod for controlling said ports, a ressure responsive device and connections tween a0 said valve and said ressure responsive device including a flexibleelement, said ports in said piston rod being formed to direct the jetsfof liquid flowing through said ports at an inclined angle and away from said valve.

3. Ina regulator of the class described, the combination of a pressureresponsive device, a hydraulic motor having a piston structure, a valve carried by the iston struc- 9o valve and said device, said motor having a fluid supply connection to one side only of said piston, and a fluid outlet port through said piston structure and controlled by the valve, the port having an inclined side to direct `the jet of liquid flowing through said port at an inclined angle and away from sald valve.

4. In a regulating device of the class described, the combination of a pressure responsive device, a hydraulic motor having a piston structure and a sleeve valve carried by the piston structure, a connecting blocln secured to said valve, a chain connected to said block and to said device, said motor having a fluid supply connection to one side only of said piston,l and a fluid outlet port formed in said piston structure and controlled by said valve, the ort having its lower side inclined to direct t e jet of liquid flowin through said port at an inclination towar said block and away from said valve.

5. In a regulating device of the class described, the ,combination of a valve structure, including a valve and a hollow member in which `the valve slides and through which liquid escapes, a pressure responsive element for controlling the operation of said valve, and a flexible connection between said 12o element and valve, said hollow member having ports controlled by said valve and through which jets of liquid pass into said hollow member, the ports being formed to direct the jets at an inclined angle with respect to said flexible connection and away from said valve.

6. In a regulating device of the class described, thecombination of a valve-structure'including a sleeve valve and n. hollow 1u member in which the valve slides, a pressaid hollow member, the port having its sure responsive Aelement for' cntrolling the side, uncovered by the vvalve, inclined to Y operatqn of sidv-val've'; 'and i'exible condirect the jet of liquid at an inclination'with'w nectin including a chain between said elerefeet to said e`hain and away from the ment and valve skid member halvn a pprt` en of said valve. v which is contro led by saidsleeve u ve, and i through which a jet of liquid passes into i CHARLES M.TERRY.

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