US1782635A - Boiler and furnace - Google Patents

Description

Nov. 25, 1930. c. w. sTANcLlFFE BOILER AND FURNACE Filed April 13. 192e 2. Sheets-Sheet l Arron/Ely `Patented Nov.`

\ AoiazcIIi WHEATLEYVSTANCLIFF, or: LnwYcn, LonnonffENGLAivpi f" "nomina AND summon? i Application inea Aprilia, 1928, Seria; No. 259,359,V` and in" (1a-ea@BritainV April 22`,`"`1`92`7L" `"'Ihisinvention relates to control apparatus "for boilers and furnaces, and has for' its principal object to provide an improved apparatus which will avoid'the uncertainties at` f ymechanical means in accordance with the vall() p p g i 'physical quantity of the boiler vor furnace.

tendant upon lelectrofmagnetic means pre- `viously,proposed and will enable the supply `offuel 'air exhaust gasesor other similar quantities to be controlled automatically by riation of steam p'ressurefor other i variable `The invention is fparticula'rly applicable,

though not restrictedto controlling thesupply-of fue'land air to 'a boilerandit is to be Y understoodr that wherever I' refer in this speciiicationto the fuel control means I mean tocover thecaseofsolid orliquid.fuelsup- H s ply, 0,1" @if Supp f which is a function of the steam pressure or other variable physical quantity of the boiler provide` a controlV apparatus comprising a -which increases in a predetermined.manner "lso that lthe position of the plunger depends" ly orboth fuel and airfs'upplytogether.yY` -V g l `A further object of4 thelinventionj is `to plunger which Vis `subjected toa pressure or furnace,"and moves against a `resistance upon the boiler pressure or otherV controlling quantity, and the movement of the plunger` is communicated by improvedindependently driven mechanical means to the supply con- @adjusted ataj stage -ofits movement l.without affecting the movement allowed to thevcontrol `device for anzequalwmovement of" the main V` trol meansatonefor more stations.

A further object Vofthe invention is to protrolv member moves. by y amounts which are control* deviceV correspondingj to" a given-7 movement of the main control `memberto be `controlmember vat other stages of its movej A *A further object istoprovi'deat .theffuelv control; stations meansrfor` imposing `an adffrfem; the lplungen fp n Justinentqupon the movement transmittedi` jmentary damper control apparatus l from fthe, main control plunger.` i i x- 5:1

1 lllhe plunger carriesa weight E Eat its upp {Lactsas a-relay.

With these andother objects in View thev invention consists in the novel arrangements and i combinations f-hereinaftper described in detail, thenovel features whereof are set out in the appended claims. y the ,accompanying draw lustrate the invention in a diagrammatic kmanner, f i

`Figlreprese form of main control plungerapparatusfthe -positionof theplungerof which isautomatif Y lied by the steam pressure in the p l ntsin elevation the preferred cally contro .b oileri'g llTig. Q'repr l esents elevation -the suppleoperated u.

Figa `3 represents inelevation the ings which iimentary fuel; feed control apparatus oper-` `ated from themaincontrol plunger.

, `:Referriuig first,` tofFig` 1- of the drawings oil which communicates withjachamberC i i nected by a pipe D to the boileryafv 1 `end `which `is guided between frame `members ag.- Upon ledges b on thisframe are vmounteda having `water atthe'bottom and oil on the` topythe` lower parti of `this chamber is con-y y Y `'I5 er series of loose weights E, which maybe of f equal or ivaryingweight Vand may be at equal `Oruneolual distances apart., When thejdiiference offpressure-on the twosides of thepiston 'A'-depending upon the steam pressurein the boiler-exceeds theV total weight i of plunger y .and weight E, the plunger rises `until it en-` Y resting onits `appropriate `ledge Lwill be able to pass-freelyabovethe Vupper ledges. i Y The position ofthe plunger controls the po- -f vsition` ofa controlfc'able Gr and this cable is carried ashaft H driven byV anfndependentx motor so that "the piston needinot be ablelto` have suliicientpower to operate the `cable" V'1o` a plungerfA works in a cylinder BVfull of.y n l soV Above and below the worm wheel J 3pin-V ions J t, J5 of equal diameter are carried. rlhese pinions are adapted alternatively to engage pinions H, H5 carried by bevel pinions H5, H7 each of which engage a bevel pinion H3; these bevel pinions form a crown bevel train and are carried in a bracket H2 which slides on a guide rod K and through which the shaft H passes. The pinion H5 is keyed or splined to the shaft H and the pinion H7 is loose Jthereon and the upper portion of the shaft is screw threaded and passes through a. nut L and is connected to the cable G by a swivel H1. Y

Now suppose that the plunger rises; the pinion J 1 will then engage the pinion H4 and the shaft H will thus rotate and due to the engagement with the nut L will rise also. rlhe shaft H will stop rotation when the'plunger stops because the pinion H4 will then rise clear of the pinion J 4.

- If the plunger falls, the pinion J5 Will move into engagement with the pinion H5 and through the loose bevel pinions H5,l H3 will drive the bevel pinion H5 in the reverse direction thus causing the shaft H to fall; when i the pinion ceases to fall the shaft H will stop because the pinion H5 will pass out of engagement with the pinion J5.

The plunger thus acts as a relay governing the position of the shaft H and thus of the control cable G. f

v The main control cable Gr is connected in any suitable manner with a number of supplementary control stations. The main cable -may for instance be connected to a shaft upon .which are carried a number of supplementary control cables which will move in unison with the mam control cable, and by employing pulleys of varying' sizes the motion may be geared up or down.

It is desirable that at each supplementary control station we may have a control apparat-us which may be adjusted independently of the other controls. 'l`his is effected by con- .rnecting the supplementary control cable M,

Fig. 2, to a series of weights Q, in number equal to those of the main control apparatus and at the same distance apart if the cable M moves at the same speed as the main cable Gr, and at corresponding distances apart if the cable motion is geared up or down.

The weights are connected by chains e and are suspended by chains l from a fixed bracket O the cable M passes through this bracket and through the Weights and is connected at the end to an abutment m which-is adapted to engage under the lowermost weight Q and to lift it. Vhen the cable has moved sufficiently the other weights Q will be picked up in turn. The weights Q are connected by cables R1, R2, R3, R4 to a counterweighted lever S attached to the damper l) of a flue T.

The length of each of these chains lll-R4 can be adjusted so that the position. of the Idamper corresponding to any given over pressure of steam may be varied due to particular circumstances such as iue gas analysis; any convenient adjustment means may be employed for the length of chain.

VIn the position shown on the drawings the damper is full open, the lowest .veight Q is about to be lifted and the chain R4 is taut; the length of the chain R4 however ce.; be adjusted independently of the main control apparatus and thus the position of the damper varied. y

When the abutment m rises to `bring the two lowest weights Q, in contact the chain RL will have become slack and the damper will be controlled by the cable Rg which will then be slack, and so on for other positions.

rlhe apparatus illustrated in Fig. of the drawings for the fuel control is similar in all respects with that previously described except that the chains l-Ri are connected to a drum ll connected to a rheostat lever V by a cable u passing over a pulley c and carrying a counterweight lV. Each rheostat governs Vthe speed of a motor or other device which determines the rate of` fuel to each boiler, and thus each rheostat can by means of the chains have any desired adjustment imposed upon that given by the main control apparatus.

It is to be understood that the invention is not restricted to the exact details shown and described but embraces such modifications as come within the ambit of the accompanying claims.

A I claim l. Apparatus for controlling boilers and furnaces comprising a plunger subjected to a pressure which is a function of the steam pressure or other controlling quantity, a series of weightsat spaced intervalseach normally resting against abutments, means for causing said weights successively to resist the movement of said plunger, a power driven shaft, a supplementary shaft having gearing `connection with said shaft, means for throw- "45 v ice for one step of the `movement of the given movementof the main control member incassa two parallel pinions on said transmission shaft slightly farther apart than thewsaid power driven'pinions and adapted to engage therewith one ata time, onevof said pinions beingifreeon said transmission shaft and the other being splinedthereto, bevel wheels connecting said pinions, means for causing said transmission shaftuto move axially and m` n out `of engagement with the power driven n meansfor'cau'sing said pini-ons carried thereby'to move` with the shaft and thus to move pinion when axial movement of the latter ceasesi i t i 3. lApparatus for controlling boilers and furnaces comprisingV a main control' meinber moved by distances which are vfunctions n of tliesteam pressure or] other controlling mquantity, a secondary control `means v comprising a series of weights` successively lbrought into operation by successiveV stepped n. movements of the main control member, a supply control-device, and `a flexible member ofvariab'le length connecting each weight to the supplycontrol device.

V4. Apparatus `for controlling `boilers and furnaces,` comprising in combination acontrol means which moves by distances which ,are functions of boiler pressure or other boiler condition, a supply control device,and a pluralityof flexible members connecting tlie supply control device to the control means and successiv-elycoming into operation as the control means moves into successive positions.

`5. Apparatus for controlling boilers and furnaces comprising in combination armechanically operated control `means `which lmoves by distances which are functions of boiler pressure or otherboiler condition, a

supply control device, a series of independent mechanical connectors controlling the `inovement of the supplycontrol device at successivesteps of the movement of the controllV means, and mechanical means for varyingV the movement of the supplycontrol denaces in which a main control member which is `caused vto move by amounts which are functions ofthe steam pressure or other n boiler condition communicates its movement to a series of weights `suspended from a fixed support one above the other and con-l nectedto each other by chains or cables,

vsaid weights being connected to a `supply fcontroldevice.y i

t 8. Apparatus for controlling boilers!- and furnaces in which a main4 controlV member moved by distances which are functions of f the steam pressure or other controlling jl quantity communicates its movement toga i series of weights each of which is con motor, a control member, and gearing driven by'4 said motor and causing the control member to follow the movement of the plunger. j

`-l( Apparatus for controlling boilers and furnaces comprising a main control member `moved byydistances which are functions ofV thel steam pressure or other controlling quantity, a supply control device, a plural` i ity lof secondary control members adapted I' i to be successivelyactuated by the malin control member, separate mechanical connec-fV tions between said secondarycontrol mem- I bers `and said supply control device, and means for varying the effective length of said vmechanical connections.

gearing for rotating said plunger from said In testimony whereof I allix my signature.

CECIL WHEATLEY STANOLIFFE.

control means without affecting Vthe move-vV ment of the supply control device for other i moved by distances which are functions of the steamvpressure or other `controlling 'quantity, a plurality ofV seconda-ry control AcwA means each operatively connected to the main control member, means for connecting `by mechanical means each secondary control means to a supply control device, andadjustable means whereby the `movement lgiven to any one supply control device for any throughout its range oflinovementmay Vbe steps of the movement of thev controlfmeans.V i 6. Apparatus forrcontrollingvboilers and @furnaces comprising a I nain control member l t varied without affecting the movement given V Y toany other supply control device. y .t

7. Apparatus for controlling boiler furiiso y

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