US1449707A - Damper regulator - Google Patents

Description

J. M. SULLIVAN DAMPER REGULATOR Mar. ,27, 1923.

Patented Mar. 27, 1.923.

UNITED STATES JOSEPH rr. SULLIVAN, or DETROIT, IuIoHIeAIv.

DAMPER REGULATOR.

Application led April 16, 1921. Serial No. 461,931.

To all whom 'it Ina/y concer/a.'

Be it known that I, JosnrI-I M. SULLIVAN, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State 'of Michigan, have invented certain new and useful Improvements in L Damper Regulators, of'which the following' is aspecification, reference being had therein to the accompanying drawings. y

This invention relates to a damper regulator for boilers and has special reference to that class of automatic damperregulating devices which "are Jactlmlated by extreme pressure to adjust a damper controlling the draft to the combustion chamber of the boiler andV consequently the generation `of steam by the boiler.' I am aware of such devices being used and the regulation of a damper in two extremes, that is, the damper is either open or closed and there is no intermediate position to which the damper is adjusted, consequently there is either a high or low pressure of steam in the boiler, in one instance probably a waste of fuel, and in the other instance not suiiicient pressure for power. v My invention aims to provide a damper regulating device by which the damper may be minutely adjusted in accordance `with a boiler pressure, thus insuring a positive and uniform regulation without any abrupt changes in boiler pressure. i

My invention further aims to provide an intercepting valve that may be easily and quickly installed in damper `regulators already in use, so as to convert such extreme damper regulators to regulators permitting j J tion;

of a wider-range of damper adjustment.

My invention alsol aims to vimprovedamper regulator devices by certain mechanical refinements which lend greater sensitiveness tothe devices, facilitates manu-- facture, and afford a higher degree of etliciency in the automatic control of boilers,

furnaces and other heating apparatus.

My invention will be hereinafter described and then claimed, and reference will now be had .to the drawings, Awherein vFi re 1 is a front elevation of the damper regu ating device, partly broken away and partly in section, showi its lrelation-to a damper and parts ofthe installation conveniently arranged for the sake of illustral Fig. 2 is a vertical transverse sectional view of the regulator valve taken 'on a plane at' a right angle to the section of the valve shown in Fig. 1;

Fig. 3 -is a horizontal sectional 'view' of the regulator valve; and

nected a pipe or conduit 5. This pipe o`r conduit supplies steam to the diaphragm casing 4 at boiler pressure and consequentlyleads from the boiler (not shown).

Suitably mounted in the diaphragm casing 4 is a diaphragm 6 having a central wear or Contact member 7 normally engaging the knife edge or contact point 8 of a lever socket 9, said lever socket having its bifurcated inner end or short arm 10 apertured, as at 11, to receive knife edge pivot` members 12 carried bythe diaphragm casing 4.

yThe lever socket 9 is limited in its movement relative to the diaphragm casing 4 by a set screw 13 carriedbythe lever and` e15- tending through an'apertured lug or bracket Fig. 4 is a cross sectional view taken on 14 of the diaphragm casing 4, and detacha- Vbly mounted in the lever socket is a long` lever 15 disposed in a plane parallel to the instrument board 1.

f On the outer end of the lever 15 is an adjustable vsuspension member 16 for a weight 17, said weight maintaining the contact point 8 of the lever ,socket 9, constantly,l

in engagement with the contact member of the .diaphragm 6, so that steam pressure in the diaphragmcasing 4 may elevate the outer end of the lever 1 Extending outwardly from the instrument board 1 is a stud 18 and adjustable on `said stud is the apertured boss 19 of the.

regulator valve body 420. The kmanner of supporting the valve body 20 permits of it being correctlyl positioned relative to `the' lever 4 15" and also facilitates connections with said valve body for purposes which will hereinafter appear.

The valve body 20 is provided with a longitudinal central fbore 21 and in said valve. body, about the bore 21 are an inlet chamber 22,*a discharge chamber 23, and

with the bottom chamber 26 of the valve4 body, said plug having a discharge pipe or conduit 32. The plug 27 is tubular and communicates with the top chamber of the valve body 20, and slidable in the plug 27 and the liner 29 and extending into 'the lplug 28 isfa hollow valve stem 33 provided `with chambers 34 and 35.

The chamber walls 34 have opposed ports 36 and 37 and the chamber walls 35 have opposedI ports may be blanked or closed by walls of the liner 29, but the ports 36 are adapted to ,constantly communicate with the topv cham-2 ber 25 of the valve body.

Communicating with the chamber' 22 of the valve body 20 is a pipe or conduit 40 4ada ted to admit water or a motive liguid to t e chamber 22. Since the valve is used as a regulator in connection with a boiler, it is preferable to use water under pressure as a motive liquid for performing work, as will hereinafter appear.

rlhe discharge chamber 23 of the valve body is connected by a pipe or conduit 41 to the top of a vertically disposed cylinder 42 suitably supported from the instrument board 1. vThe bottom of the cylinder 42 has an atmospheric port 43 and slidable in the top of the cylinder is a piston rod 44 provided with a conventional form of piston 45 within the cylinder 42. The cylinder 42 is adapted to receive the motive liquid from the valve body 20 and such motive liquid and the cylinder constitute power means for adjusting a damper.

To illustrate how .a damper may be adjusted, l: show a flue, stack or conduit 46 having a lshutter or damper 47 therein. The damper 47 is onv a pivot 48 provided with a sheave 49 and trained over the sheave 49 is a iiexible member 50, as a cable, said iexible member being trained over lother sheaves 51 yand having its ends attached to a weight or counterbalance 52 and to the end of the piston rod 44. The weight or Y' counterbalance 52 has a tendency to constantly open the damper 47 and by lowering the piston 45 within the cylinder 42, the damper 47 may be adjusted towards a closed position or completely closed.

Slidably mounted on the lever 15 and secured in a xed sition relative thereto is a bracket 53 provided with a side bearing 54 for a rock shaft 55. One end of the rock shaft 55 has a cross head 56 and slidable in said cross head is a block 57 having a.

by a link 61 Yt0 the lever 15, and said arm is adapted to occupy a position normally parallel to the lever 15. j

Attached to the opposite end of the rock shaft 55is a depending crank 62 and the lower end of said crank is connected by a link 63 to a coupling link 64. The coupling link 64 forms part of a flexible'member or 38 and 39. Since the valve stem 33 is slid-. able in the valve, the ports l37, 38 and 36 cable 65 trained over and under-sheaves 66. One end of the cablev 65 is attached to the upper end of the piston rod '44, and the opposite end of the cable 65 is provided with a weight or counterbalance 67. The weight 67 cooperates with the weight 52 in vrmain- V taining the piston 45 intermediate the ends of the cylinder 42 with the damper 47 in what may be considered a midway position,

so that it may be either adjusted towards a full open position o r a full closed position, depending on 'the movement of the piston 45Y in the cylinder 42,

For the 'purposes ,of explaining the operation of the f regulator, the midway position of the damper 45 may be considered normal-with the boiler or boilers operating at a desired steam pressure.

By reference to the valve'in Fig. 1 it will be noted that the intermediate . ports 37 and 38 of the valve stem 33 are blanked by the walls of the linerv 29, and assuming that the pressure of a boiler increases, the diaphragm 6 will be expanded or flexed upwardly to raise the lever 15 and the valve stem 33 which is articulated with said lever by the and port 38, permitting the `water or motive liquid, under pressure, to enter the `pipe or conduit 41 and the upper end of the cylinder 42. The water will Vshift the piston 45 downwardly within the cylinder 42 and shift the damper 47 toward a closed position reducing the draft in the flue 46 consequent- .the exhaust pipe or.conduit 32.

1y reducing steam pressure at the boiler or boilers.

Since motive liquid is admitted to the cylinder 42 there would be a full stroke of the piston 45 and complete closing of the damper 47 if no provision were made for intercepting the stroke of the piston 45 and consequently the t'ull closing movement of the damper 47. The intercepting action takes place after the initial movement of the piston 45 and such action is brought about by the weight 67 shifting the crank 62 to rock the shaft and turn the cross head 56 at an angle to its original plane. That end of the crossA head ad'acent the Valve body 2O will -be lowered caus ng the block 57 to shift and lower the arm 59. Since this arm is articulated with the valve stem 33, the valve stem will be lowered, thereby shutting off the motive liquid to the cylinder 42 and causing a cessation in the downward movement of the piston 45. This takes place before the damper 47 hashad a chance to fully move to a closed position, therefore its movement has been intercepted and the damper but partially closed.

Lowering of the valve stem 33 has retained the motive liquid within the cylinder 42 so as to hold the piston 45 in a shifted position. against the action 'of the weight 52, which has a tendency to open the damper 47.

Considering a reverse operation of the regulator device and assuming that boiler pressure has dropped below normal, there is a reduced pressure in the diaphragm casing 4 and consequently the diaphragm 6 is flexed downwardly and the lever vl5 lowered. This lever, through the medium of the bracket 53, link 61 and arm 59 causes the valve stem 33 to be lowered, placing the valve stem ports 37 in communication with the discharge chamber 23, consequently the motive liquid within the cylinder' 42 is released and discharges through the valve stem 33 into `the top chamber 25, exhaust cham, ber 24, bottom chamber 26 and out through Since the motive liquid within the cylinder 42 has been :released the weight 52 causes the pivot 48 to turn and start to open the damper 47, but before the damper can travel Very far, its movement is intercepted. This is accomplished by the crank 62 being shifted in an opposite direction to that previously described, so that the cross. head 56 will be tilted and the pivoted end of the arm l59 raised, thus causing the valve stem 33 tobe raised and restored to its normal position, 4

cutting off the exhaust of motive liquid from the cylinder 42.

What I claim is l.. The combination of a damper, a valve adap-ted to be adjusted and by such adjustment effect movement of said damper, an arm for adjusting said valve, a slide head at one end .of said arm, pressure actuated means adapted to bodily move said arm and said slidel head to adjust said valve in one direction, and gravity means operable independent o the lirst mentioned means adapted to cause said slide head to slide and adjust said arm so that 'said valve is adjusted in an opposite direction.

2. In a damper regulator, a valve by which the regulation is attained, an adjustable valve stem, a lever adapted to adjust said valve stem, an arm having one end sup;

ported by said lever and adapt-ed to-be moved thereby to adjust said `valve stem in one direction, a lpivoted crank supported Jfrom said lever, a head movable with said crank, and a slide block carried by said head and articulated with-the o-pposite end of said arm adapted for moving said arm to adjust the valve stem in an opposite direction.

3. In a damper regulator, the combination of a damper, a sheave for adjusting said damper, articulated cables with one of said cables trained over said sheave, weights suspended yby said cables as counter-balance means for said damper adapted to be unbalanced and cause either opening or closing of said damper, fluid actuated' means adapted to unbalance said counterbalance meansv and cause said damper to start to close, a valve controlling the operation of said fluid actuated means,v pressure actuated -means adapted to adjust said valve to set said liuid actuated means in operation, and interceptin means actuated by the unbalancing .of said counterbalance means adap-ted tof cause adjustment of said valve and a cessation in the operation of said fluid actuated means.

In testimony whereof I aflix my signature .in presence of two witnesses.

JOSEPH M. SULLIVAN.

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