Патент USA US2404849код для вставки
,J. L. KIMBALL ‘ REGULATOR Filed Nqv.‘l, 1944 2 sheetsfsheet 1 INVENTOR. yam“ ?W Iv. L. K m B A L L. R E G UM T O R Filed Nov. 1, 1944 2 Shegts-Sheet 2 INVENTOR. Patented July 30, 1946 ' 2,404,849 UNITED STATES PATENT OFFICE 2,404,849 REGULATOR James L. Kimball, Danvers, Mass., assignor to Ruggles-Klingemann Mfg. (30., Salem, Mass. - Application November 1, 1944, Serial No. 561,445 5 Claims. (01. 121—41) 1 2 My present invention relates to regulators of the general character described and claimed in Patent No. 2,378,410 of June 19, 1945. follow-up members. The quick throw arm being broken away to show vpivot point of the follow One of the objects of my present invention is in simplifying the construction and in making more effective the step action operation as dis closed in the above referred to patent. Another object is in disclosing improved means for con trolling dampers, valves and other pressure or up member. r Fig. 4 illustrates the action of the cam in op erating the quick throw arm when the servo mo tor is operating in an upward direction, and Fig. ‘ 5 illustrates the action of the cam in operating the quick throw arm when the servo motor is op_ erating on the downward stroke. temperature control devices. This improved step 10 My invention is applicable to any type of ?uid pressure operated regulator and is preferably action regulator was primarily developed for the adapted to regulators having what is commonly operation of drum controllers and the like, used referred to as a follow-up return method of com in ‘the operation of variable speed motor control. pensated control, the principal object of the in The object being to avoid slow movement of the servo motor and consequent burning of the con tact ?ngers. However, experience has shown 15 vention being accomplished by a novel additional control preferably associated with the follow-up. Referring to Fig. 1', D designates a damper; V, that the invention with certain novel changes as disclosed in my present invention is equally use a valve; and R, a rheostat; these constitute main control members for controlling variations in a ful in preventing hunting action due principally to response lag. 20 ?uid system, one or all of which may be operated from my improved ‘regulator as required. Due to transportation lag of a ?uid system 4 I will now describe the operation of a regulator under regulator control, there will result a re of the type embodied in my invention, ‘having a sponse lag between the correction of a de?ciency by the control means, such as a damper valve or follow-up return motion control, rheostat and the appreciation of such correction by the regulator. Such response lags, including that of the regulator, are the principal cause of A cable, chain, or other connecting means 2 ex tends over shives 5 and -5' and is operatively con nected to levers or other operating means of the sustained hunting action. As an example, as suming a case of damper control in boiler oper damper D, valve V, and rheostat R. A counter weight W operates these main control members ation, the time lag between the adjustment of 30 in one direction only. The cable or other con necting means is secured to a link '6 at the upper the damper and the result of such adjustment in end of piston rod 1. ‘ the correction of the steam pressure will ordinar Piston rod 1 has a piston 8 at its lower end ily result in an over correction by the damper which is adapted to reciprocate in cylinder 9 and controlling means, in other words, the return mo-. vtion of the conventional follow-up will be too 35. constitutes a ?uid pressure servo-motor having a reciprocatory motion for the operation of the slow to center the pilot valve at its neutral posi main control members. A pilot valve ID has an tion and the servo motor will move to an over correcting position. In my present invention the inlet port II to which is connected a source of ‘ ?uid under pressure at H for operating the servo time period in opening the pilot valve to a wide position after the ?rst initial opening and in the 40 motor, a delivery port l3 extends to the under side of piston 8 and delivery port I 4 extends to closing movement have been reduced to a mini upper end of cylinder 9 above piston 8 through mum, the rapid opening movement tending to minimize transportation lag and the rapid clos conduit IS. A sliding piston valve US has spaced cylindrical‘ ing movement tending to minimize regulator over 45 portions 11 and I 8 which control the admission correction. and exhaust of ?uid under pressure to and from In the drawings Fig. 1, shows a side elevation, opposite ends. of the servo motor cylinder 9. parts such as the diaphragm chamber, pilot valve and servo motor piston, being shown in section. The regulator is shown operatively connected to a damper, valve and rheostat and may be used for operating one or all of these control devices. Fig. 2 shows a plan view of the follow-up re turn motion with a step action operating member supported thereon. Fig. 3 shows an elevation of the step action and When valve I6 is raised,’?uid is admitted past the lower edge of cylindrical portion l1 to port l3 and to the under side of piston 8, at the same time the lower side of cylindrical portion 18 is moved upward permitting the‘ exhaust of ?uid from the upper end of cylinder 9 through con duit l5 and port l4 thence to exhaust connec 55 :tion l9. ‘This operationcausespiston 8 to‘ move 2,404,849 “' ‘ u ' 3 upward. When valve I6 is lowered ?uid is ad mitted past the upper edge of cylindrical portion l8 thence through port l4 and conduit I5 to the the operation thus far given that piston 8 of the I servo motor could be operated in a slow motion or a relatively rapid motion depending on the nature of the impulse in pressure change acting on diaphragm 29 in chamber 39 and likewise the stopping of the piston 8, or the point at which a reversal of operation might take place, could be at anypposition between the limits of operation of V top of cylinder 9 and at the same time ?uid is exhausted from the bottom of cylinder 9 through port I3 and past the upper edge of cylindrical portion I‘I thence through passage 20 to exhaust connection l3. This operation causes piston ‘8 to move downward. Valve'It is pivotally ‘connected the servo motor. ‘ :_ . at 2| with a ?oating lever 22. The right hand 10 My invention resides in ‘part in ‘means associ end of ?oating lever 22 has pivotally mounted ated with the follow-up compensating means connecting rod 23 which connects the ?oating “ adapted to effect an abrupt relatively high speed lever 22 with weighted beam 28 of a pressureire- ' 7 ‘operation of the servo motor between de?nite sponsive device. Variations in pressure in cham— steps of operation in either direction and con ber ‘39 acting on a diaphragm 29 actuate weighted 15 sists of .an additional control supported wholly beam 28 through knife edge fulcrum positions 29 and 26 to raise or lower ?oating lever 22 and con by the follow-up which I will now describe. My invention includes an additional control for I sequently valve It to thereby operate the servo“ actuating the left hand end of ?oating lever 22 motor a counter weight 21 is adjustable on beam to thereby effect an abrupt operation of the pilot 28 in counter-acting the pressure setting of the 20 valve It to cause a relatively high speed opera regulator; A further description of the invention tion of piston 9 for a de?nite step of operation re will be clear. if it is understood that an upward gardless of the nature ‘of the initial impulse'a'ct-V movement of valve It through an increase in ing on diaphragm 28. To accomplish this ob pressure on diaphragm 29 means an upward ject I provide an operating member 38 having movement of piston 8 and likewise a downward 25 a long arm a! equipoised at a neutral position by movement of valve it through a reduction in resilient means such as springs 42 and 42’ a gear pressure on diaphragm 29 means a downward rack 43 is . attached. to wedge 3i and drives a movement of piston '8. i ' gear pinion 413 attached to an operating cam 45. In order to obtain the maximum effectiveness This operating cam 45‘ has three notched depres of the step action principle a relatively Wide lap 30 sions equally spaced ‘positions 46 at its periphery; ping of the ports I 3 and. I 12 by the cylindrical por tions I‘! and I8 is desirable. This not only in— sures a positive step of operation but provides a de?nite dwell, or non-responsive action; at each of the step positions which compensate for time lag by ‘acting as an equilibrator after each step of operation before moving to a succeeding step position. any number can be used depending on the length i of step required. - - _ These notches at the periphery of cam 45 are engaged by a projection 41 at the left hand (and of long arm Li I. This projection such as a stud or roll assumes an equilibrium or neutral position by means of the balancing springs§42 and 42’ attached to said arm when stud 47 engages notches 45. I will next describe the'operation from the fol low-up return motion, a wedge 3| is connected at 40 The operation of the cam 4-5 and its associated its upper end to link 5 secured to piston rod ‘I members will be best understood by a'reference to said wedge having reciprocating motion co1‘re Fig.4 and Fig. 5. Assuming an upward move spending to that of piston ii, a bell crank 32 is ment of piston '8, aswould be the case with an pivoted to a suitable stationary support at 33 (see increase in pressure acting on diaphragm 29, then Fig. 3) has a shoe 34 held in contact with wedge cam ~45 would be operated counter clockwise and‘ 35 by means of spring 35 and is adapted to rock arm 4| would assume aposition as shown in Fig. bell crank 32 with the upward and downward 4. This operation would raise pivot point 40 and‘ movement of piston 9 and connecting wedge 3|. operate ?oating lever 22 to thereby open the pilot There is pivoted at the right hand end of bell valve ports an amount‘ in excess of its initial crank 32 (see Fig. 2) at’p‘oints 36 and 3'! a yoked 50 opening. Likewise on a downward motion of pis member 32 having a short arm 39 movable with that of bell crank 32, ?oating lever 22 being con nected to this arm at pivot point 49. Assuming an increase in pressure in chamber 39 causing an upward movement of valve l6, pis ton 8 as on a decrease in pressure on diaphragm 29, cam 45 will be operated in a clock-wise direc tion and arm M will assumea position as shown in Fig. 5, further opening the ports of valve I6 for the downward stroke. This additional control for effecting step‘by step operation of the servo motor ton 8 and its connecting wedge 3|, shoe 34 in following the angle of wedge SI will be forced to cooperates ' with the follow-up compensating the right causing the right hand end of hell means in the following manner. . crank 32 to be lowered, which in turn lowers the Assuming the initial opening of the pilot valve left hand end of ?oating lever 22 thus returning 60 I6 is 3%;4” of an inch, which would be suf?cient to the valvev It to 'a neutral position. On a reduc give a slow motion to the servo motor piston 8, tion of pressure in chamber II the reverse oper ation takes place valve is is lowered ‘below its neutral position and the right hand end of ?oat ing lever 22 is raised to again return the valve It to neutral position, neutral position as above re ferred to meaning a mid position between two effective positions to which the initial operation and the additional ‘opening effected by the‘ oper ation of cam 95 isl/wfof an inch eiiecting a more rapid motion of piston 9, at the ‘same time the return motion of the follow-up effected by wedge 3|, for the step of operation, will be the same ‘as ’ the initial opening plus the amount of lap be- tween the neutral ‘position and its effective ‘posi tion, consequently when projection 47 engages The operation of this class of regulators having 70 notch ‘46 ‘allowing arm_ M to assume its equilibi a follow-up compensated control is generally re rium position, the'pilot valve will have been re of the motor is effected. ' ‘ ferred to as ?oating regulation as distinguished from “step action” regulators disclosed in my earlier patents. ' It will be understood from the description of turned to its neutral position to await a further variation in pressure on diaphragm 29 for a fur; ther operation of the servo motor. - ' ‘ ' It is possible that'the'change in pressure act 2,404, 849 5 6 ing on diaphragm 29 could be su?icient to oper ate the pilot valve stem It‘ so far above or below its neutral position that the return motion of the follow-up wedge 3! would not be su?icient to bring the valve l6 back to a neutral position in a single step of operation. However, when the stopping point is reached it would be at a step sure ?uid for operating the motor, a ?oating lever connected with said valve for imparting move ment to the valve, an actuator coupled to the ?oating lever at a point at one side of the point where the connection from the valve to the ?oat ing member is made, a bell crank pivoted at a position corresponding at a step position under normal operation. The invention has by way of member pivotally connected with one arm of said bell crank at a location displaced from the ful ?xed point with respect to the motor, a yoke example been illustrated and described as a pres crum of the bell crank and having an arm which sure control regulator, it is to be understood, how ever, that the invention may be applied to other regulating combinations, as for example by re placing the diaphragm with a thermostat element is pivoted to the ?oating lever at the opposite side of its connection with the valve from the side at which the connecting point of the ?oating it may be used as a temperature control. In ac cordance with the provisions of the rules of prac tice of the Patent Of?ce, I have described the principle of operation of my invention, together with the apparatus which I now consider to rep resent a preferred embodiment thereof; but I 1 desire to have it understood that the apparatus shown is only illustrative and is capable of var ious modi?cations and that only such limitations shall be imposed as are indicated in the appended claims. I claim: 1. In a regulator having a ?uid pressure oper ated motor and a valve adapted, to control the ?ow of working ?uid to said motor, a ?oating lever coupled with said valve, an actuator mov- - lever with said actuator is located, a wedge mem ber connected to be moved by the motor and ar ranged to bear on another arm of said bell crank to impart movement thereto, and a cam also con nected to be driven by the motor engaged with a part of said yoke to impart movement thereto about the pivotal connection of the yoke with the bell crank. 4. In a regulator having a ?uid pressure oper ated motor and a valve adapted to control the ?ow of working fluid to said motor for operating the motor in either of two directions, a ?oating lever coupled with said valve, an actuator mov able in response to changes in the conditions gov erned by the regulator, operatively connected with said ?oating lever to transmit motion thereto, a second lever pivoted on a stationary able in response to changes in the conditions gov fulcrum, means operated by the motor and en gaged with said second lever for imparting move said ?oating lever to transmit motion thereto, a ment thereto, a coupling member carried by the second lever pivoted on a stationary fulcrum, second lever in pivotal connection therewith at a means operated by the motor and engaged with 35 distance from the fulcrum thereof and in motion said second lever for imparting movement there imparting connection with the ?oating lever, and to, a coupling member carried by the second lever a cam driven by the motor acting on said cou erned by the regulator, operatively connected with in pivotal connection therewith at a distance pling member to move said member in one or the from the fulcrum thereof and in motion-impart opposite direction relatively to the second lever. 5. In a regulator having a ?uid pressure oper ing connection with the ?oating lever, and a cam 40 driven by the motor acting on said coupling mem ated motor and a valve adapted to control the ber to move said member relatively to the second ?ow of working ?uid to said motor for operating lever. said motor in either of two directions, a ?oating lever coupled with said valve, an actuator mov ‘ 2. The combination with a ?uid pressure actu able in response to changes in the conditions gov ated motor, a valve controlling the supply of erned by the regulator, operatively connected working ?uid to the motor, and a plurality of with said ?oating lever to transmit motion there motion-imparting elements connected for opera to, a second lever pivoted on a stationary fulcrum, tion by the motor, of a movable member mounted means operated by the motor and engaged with to receive motion from one of said motion-im said second lever for imparting movement there parting elements, a coupling member mounted on to. A coupling member carried by the second the before named member with capability of in dependent movement relatively thereto and oper lever in pivoted connection therewith at a dis atively associated with another of said motion tance from the fulcrum thereof and in motion imparting elements to be actuated thereby, an ac imparting connection with the ?oating lever, said tuator movable in response to changes in condi 55 coupling member beingequipoised relatively to tions to be governed by said motor, and a ?oating the second lever by resilient means, and a cam driven by the motor acting on said coupling mem lever in connection with said actuator, coupling member and valve. ber to move said member in one or the opposite 3. In a regulator, a ?uid pressure operated mo direction relatively to the second lever. tor, a valve adapted to control the ?ow of pres - JAMES L. KHWBALL.