US 1300383 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
A. J. HALL.
APPLXCATION FILED NOV. 25. 1914.
1,300,383. Patentd Apr. 15,1919.
INVENTOR Aff/M/J f/a/A BY 2 ATTORNEY WITNESSES AitTI-IUB. J. HALL, or WILKINSBURG, rENNsYLvANI-A, AssreNonTo WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, -'A CORPORATION or PENNSYLVANIA.
' Specification of Letters Patent.
Patented A r.-15, 19 19.
Application filed Nbviiidr 25, 1914. seriei'nesvaels.
To all whomit may concern:
, Be it known that I, ARTHUR .HALL, a subject of the King of Great Britain, and a resident of Wilkii'isburg, in' the county of Allegheny and State of Pennsylvania, have invented a new and useful Iinprovement'in Control Apparatus, of which the following is a specification. U
My invention relates to control pparatus for governing the operation of dynamo-electric machines, and it has special reference to liquid rheostats that are adapted for use in connection with alternating current induction motors. p
One of the objects of my invention isfto simplify and improve the construction and operation of apparatus of the above-indicated character and to provide control apparatus of simple,c0II 1pact and light con struction which shall operate effectively and reliably to perform its intended functions.
Another object of my invention is to provide a combined discharge and regulating valve for liquidrlieostats having a minimum number of movable parts and which may be actuated readily without undue frictional resistance.
A still further object of myinventio'n is to provide a fluid-pressure operating mechanism for efiecting the actuation of the combined discharge and regulating valve hereinbefore referred to, and which shall embody a plurality of electrically operated inlet and exhaust valves associated with each end of the operating cylinder by means of which the discharge valve may be actuated at different rates of speed.
In a co-pending application, Serial No. 829,432, filed Apri 4, 1914, by'G. M. Eaton and assigned to the Westinghouse Electric & Manufacturing Company, a liquid rheostat is disclosed which is provided with independently operate d discharge and regulating valves that are arranged in concentric or telescopic relation. For certain classes of work, the operation of valves of this type is sluggish and'unreliable by reason of the excessive amount of frictional resistance that the moving parts encounter. Moreover, there is an appreciable time interval between the manipulation of the controller which governs the operation of the valves and the initial movement thereof, so that the operation is not as sensitive and quickly responsive as may be desired in certain service.
According to'my present invention,'I "propose to overcome'the clifficulties and disadvantages of operation of the prior art and to provide a device by means of which'the in side elevation, ofaportion 'of ja'pair 0f liquid rheostats constructed in'accordance With my invention; F lg. 2.is a plan View of the apparatus shown in Fig. 1; Fig. 3 is an enlarged plan view of the combined 'discharge and regulating valveconstituting a part of the apparatus illustrated inFigs 1 and 2; and Figs. stand 5 are sectional views showing said valve in difierent operating positions.
Referring to the drawing, the apparatus shown comprises a main receiving tank or reservoir 1, a plurality of liquid rheo'stats2 and 3 disposed above said tank and severally having combined discharge and regulating valves 4 and a fluidpressure operating mechanism 5 for actuating said valves concurrently. q I i The main reservoir 1 and the several liquid rheosta'ts 2 and 3, which are of like construction, may be of any 'suitable type. Each of the rheo'stats 2 and 3 is provided 'with'a bottom opening 7 which communicates with the reserveir 1, and an inlet port 8 'isassociated with each rheostat for the purpose of continuously supplying electrolyte thereto.
Within the discharge opening '7, the combined discharge and regulating valve ti: is located and said valve c'omprisesan annular supportin memberQS having, a plurality of seats 9 ZLIIL '10 of dili'erent diameters and a plurality of tubular sections 11 and 12 that respectively fit tightly over said seats 9 and 10 and are suitably secured thereto. The tubular sections ll and 12 areconcentrically related and project in opposite directions from the annular supporting member 8, the lower section 12 being substantially of the diameter ofthe discharge opening 7 and adapted to have a sliding engagement with the edge thereof, and'the upper section 11 being of materially less diameter, so that when the valve 4 occupies its initial position, as shown in Fig. 1, an annular opening is provided between the section 11 and the, edge of the opening 7 through which the inflowingelectrolyte is discharged. By reason of thecom'paratively slight and restricted area of contact between the tubular section 12 and'the edge of the opening 7, there is no appreciable frictional resistance to the moveplurality of radial arms 14 and a central portion. 15 to which is secured an operating rod 16 by means of which the valve 4 is supported and actuated, as will be hereinafter set forth.
The fluid-pressure operating mechanism 5 comprises a cylinder 20 having a plurality of movable pistons 21 and '22 contained therein and mechanically associated through the agency of a piston rod 23. A cross arm 24 has a bearing 25 upon the cylinder 20 and is rigidly associated with the piston rod 23 in a suitable manner and is adapted to be actuated thereby. The supporting rods 16 that carry the several valves 4 of the rheostats 2 and 3 are attached to the respective ends of the cross arm 24.
A combined inlet and exhaust valve 30 and an auxiliary exhaust valve 3l'are associated with the lower end of =the-cylinder 20 :and 'saidv-alves are provided with operating electromagnets 32 in accordance with well-known practice. The'upper end of the cylinder 20 is provided with a combined inlet and exhaust valve 33 and an auxiliary exhaust valve 34, both of which are adapted tions with the atmosphere.
for electromagnetic operation. WVithout describing the construction of these valves in detail, it is deemed suflicient to state that, in their normal deenergized positions, an inlet ort 36 of valve 30 is closed, while its exhaust port 37 and an exhaust'port 38 of valve 31 are open to establish communica- Moreover, an inlet port 39 of valve 33 is open to admit operating fluid to the upper end of the cylinder 20, while its exhaust port 40 and an exhaust port 41 of valve 34 are closed.
The upper end of the cylinder 20 is also provided with a pressure-responsive device 43 which comprises a cylinder 44, a movable piston 45'1and a spring 46 which surrounds a stem 47 and acts in opposition to the pressure within the upper end of cylinder 20;
The stem 47 is provided with a switch member 48 which is adapted to cooperatively engage a pluralityof stationary contact terminals 49 under predetermined pressure conditions. The purpose of the fluid-pressure responsive device 43 and the circuit connections and mode of operation of the several valves 30, 31, 33 and 34 are fully set forth in my co-pending application, Serial No. 876,484, Dec. 10, 1914, and,since these. features pertain only indirectly to my present inventlon, no description thereof will be given.
Assuming the various parts of the apparatus to occupy the positions shown in Fig. 1, it is evident that operating fluid is ad mitted through inlet port 39 of the valve 33 to the upper end of the cylinder 20, while the lower end thereof is opened to the atmosphere through exhaust ports 37 and 38 of the valves 30 and 31, respectively. Under these conditions, an unbalanced pressure acts upon the associated pistons 21 and 22 and said pistons are forced to their lower most positions, whereby the several combined discharge and reg lating valves 4 are also caused to occupy similar positions. The inflo-wing electrolyte, therefore, is permitted to be discharged into the main reservoir 1 throughthe annular discharge openings 7.
In order to quickly close the discharge openings, all of the valves 30, 31, 33 and 34 are energized and moved into their opposite positions, whereby the supply of oper ating fluid to the upper end of the cylinder 20 is cut off, while both of the exhaust ports 40 and 41 of the respective valves 43 and 44 are opened to permit the esca 3c of fluid to the atmosphere. Simultaneous y, the exhaust ports 37 and 38 of the valves 30 and 31 are closed and fluid pressure is admitted to the lower end of the cylinder 20 through the inlet port 36 of valve 30.
, By reason of the opening of exhaust ports 40 and 41, the operating fluid in the upper end of the cylinder 20 is permitted to rapidly escape, thereby reducing the pressure thereof and permitting a relatively rapid upward movement of the pistons 21 and 22, and, hence, of the regulating valves 4.
When the combined discharge and regu'-' lating valves 4 reach the position shown in Fig.4, the discharge openings 7 are closed, and the continuously inflowing electrolyte then rises to a height corresponding to the upper end of the tubular section 11 of the valves 4, which height is termed the flushlevel and is just suflicient toimmersethe lower ends of the electrodes 50. The flush-level, therefore, is' quickly established by reason of the sensitiveness and rapidity of movement of the operating mechanism 5. i Having established the flush-level, it is desirable to effect further movements of the valves 4 at a. comparatively slow rate,
whereby the height of the electrolyte with- 1n the rheostats 2 and 3 may be regulated as desired, it being understood, of course, that any excess: of electrolyte overflows and is discharged through the valves 4. The slow rate of movement is obtained by causing the valve 34: to eifect the closure of its exhaust port ll, thus retarding the escape of operating fluid from the upper end of the cylinder 20.
As the regulating valves 4: are raised beyond the flush-level position to a position such as indicated in Fig. 5, the discharge openings 7 are maintained closed by reason of the substantially tight fit between the lowerjsecti'ons 12 of the valves i and the edge of the openings 7 While the level of the'electroly te is raised to a height corresponding to that of the upper ends of sections 11 of valves 4.
Obviously, the upward movement of the valves may be arrested at any point by opening the inlet port 39 of valve 33 and closing the exhaust port 41 of valve 34 and exhaus't port L0 of valve 33, whereby balanced pressure conditions acting upon the pistons 21 and 22 are obtained.
By suitalbly operating the valves 30, 31, 33 and 34, the pistons 21 and 22 and their associated valves 4 may be actuated in a downward direction at different rates of speed. For instance, when it is desired to quickly discharge the electrolyte from the rheostats 2 and 3, it is only necessary to permit the several control valves just referred to, to be deenergized and to be moved into their initial positions, as shown in Fig. 1. Operating fluid is then admitted to the upper end of the cylinder 20 and released from the lower end thereof, whereby the unbalanced pressures effect the desired result and the valves 4 are quickly lowered to their initial positions to permit the discharge of electrolyte through said valves and through the annular openings 7 between said valves and the respective rheostat tanks.
Modifications in the structural details and in the arrangement and location of parts may, of course, be efi'ected without departing from the spirit and scope of my invention, and such modifications are intended to be covered in the appended claims.
I claim as my invention:
1. The combination with a liquid-containing tank having a bottom opening therein, of a hollow member open at its ends and comprising a plurality of cylindrical sections of materially difierent diameters, the larger section being located at the bottom and adapted to substantially fill said opening.
2. The combination with a liquid-containing tank having abottom opening therein,
' of a hollow member open at its ends and comprising an upper cylindrical section of materially less diameter than said opening and normally adapted to project therethrough, and a lower cylindrical section of substantially the diameter of said opening,
said lower section being longitudinally disposed below said opening and adapted to substantially fill said opening when 'raised in position.
3. The combination with aliquid -containing tank having a bottomope ning therein, of a movable Valve comprising two hollow cylindrical portions open atthe ends, the upper portion normally projecting through said opening and providing an. annular opening of material size between the edge of said bottom opening and said upper portion, and the bottom portion normally located below said opening and'being of sub stantially the same diameter and adapted to fill said opening when said movable'valve is raised in position.
4. The combination with a liquid-containing tank having a bottom opening therein, and means for supplying liquid thereto, of a tubular valve member disposed in said opening and normally adapted to permit the discharge of liquid therethrough, said valve member being adapted to close said opening when raised to a predetermined height and to fix the height of the liquid within said tank when raised above said predetermined height.
5. The combination with a liquid-containing tank having a bottom opening therein and means for continuously supplying liquid thereto, of a tubular valve open at its ends and disposed in said opening and initially occupying its lowest position to permit the discharge of liquid between it and the edge of said opening, said valve being adapted to be raised to close said opening and to regulate the height of the liquid within said tank.
6. A tubular valve for a liquid-containing tank comprising an annular supporting member having portions of different diameters, a plurality of tubular members of cor responding diameters and 0 en at the ends to be fitted over said respective portions and secured thereto, and means associated with said annular member for supporting said valve.
7. A tubular valve for a liquid-containing tank comprising an annular supporting member having portions of difi'erent diameters, and a plurality of tubular members open at the ends and fitting tightly over said respective portions and projecting in opposite directions, and longitudinally projecting extensions associated with the inner end ing tank having a bottom opening therein, of a hollow member open at its ends and comprising an upper ylindrical portion'of materially less sectional area than said opening and normally adapted to project upwardly therethrough and a lower cylindrical portion of substantially the area and configuration of said opening and normally disposed below and free from said opening and adapted. to substantially fill it whenraised in position. y
10. The combination with a liquid-containing tank having a bottom opening therein, and means for supplying liquid thereto, of a hollow valve open at its ends and comprising an upper cylindrical portion of materially less sectional area than said opening and normally adapted to project upwardly therethrough to permit the tree discharge of liquid between it and the edge of said opening and a lower cylindrical portion of substantially the area and configuration of said opening and adapted to be raised into sliding ARTHUR J. HALL. Witnesses:
H. T. MORRIS, B. B. HINEs.
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