US889712A - Pressure-governor. - Google Patents

Description

PATENTED JUNE 2, 1908.

W MOGLAVE PRESSURE GOVERNOR.

APPLICATION FILED MAR. 1s. 190e.

No. 889,712. PATENTED JUNE 2, 1908.

W. Mmmm.

PRESSURE GOVERNOR. vAPPLICATION FILED MAB.. 13, 1906.

Nn. 889,712. I PATENTE) JUNE 2, 1908. W. MGGLAVB. PRBSSUREQGOVBRNOR.

i APPLICATION FILED MAE. 13, 1906.

5 SHEETS-SHEET 3.

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No. 889,712. PATENTED JUNE 2, 19(18. W. MOULAVE.

PRESSURE GOVERNOR.

APPLIGATION FILED MAR. 13. 190s'.

' 5 SHEETS-SHEET 4.

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witnesses PATENTED JUNE 2, 19'08.

w. MOGLAVE.

PRBSSU RE GOVERNQR. PPLIOTION FILED MLB. 13, 1906.

5 SHEETS-SHEET 5.

tion

y boiler heated by said furnace.

" UNITED sTAzrn-srnzrnnr onirica.

WILLIAM MCCLAVE, OF SCRANTON, PENNSYLVANIA, ASSIGNOR TO MCCLAVE-BROOKS COM- PANY, yOF SCRANTON, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

PRESSURE-eovnaN'oR.-

. Specification of Letters Patent.

Patented June 2, 1908.

Application filed March 13, 1906. Serial No. 305,899.

, 5l State of Pennsylvania, have invented'ceitain new and useful Improvements lowing to be a full, clear, and exact descrip- 4 of the invention, such as will enable others skilled in the art to which it appertains to make and use' the same'.

This invention relates to improvements in pressure governors, and more particularly to apparatus designed for controlling the condition of combustion Within a furnacefor governing the pressure of steam within a The object in view is the control of the pressure within a boiler, such control being accomplished by governing the blast or draft of the furnace employed for heating thev boiler.' This and otherobjects are attained largely bythe employment of the combina'- tion of a steam supply pi e leading directly or indirectly from a boi er 0r boilers (not illustrated) -to fan engines, steam blowers, etc. (not illustrated) arranged for furnishing forced draft or blast for afurnace, a valveinterposed in the length of -said pipe vfor controlling the How Vwithin the pipe, an electromagnet acting directly upon said valve for governing the position o the saine, a gage controlled by the pressure of the boiler or boilers being heated by the furnace Whose draftapparatus is operated by the steam supplied through the 'said pipe,` an electrical circuit, means controlled by said gage for closing said circuit, an electro-magnet interelectro-magnet actin0l posed in said circuit, and a relay circuit adapted to be closed by said last-mentioned magnet, the said relay circuit including the g upon the valve.

The invention further comprises certain other novel constructions, combinations and arrangements of parts as will be hereinafter fully described and claimed.

In the accompanying drawings: Figure 1 is a general partially` in section of a pressure governor embodying the features of the present invention. Fig. 2 is a longitudinal, vertical,

view partially in. elevation and.

in Pressure- -l mechanism. Governors; and Ido hereby declare the folvalve and surroundingparts.

' erably of the balanced tylpe.

van adjusting screw 13,- ada central section through the 'valve,'s0me 0f the connected parts being shown in elevai tion, part of the solenoid being broken away for disclosing interior structure.A F 1g. 3 is a detail view in elevation of the circuit closing Fig. 4 is a topplan view l l of the l' Fig. 51s aview partially in elevation by numerals, 1,. pipe adapted tofs'upply steam or other suitable agent under pressure, to a `suitable draftlor blast apparatus for afurnace.

interposed infthle'gth of the valvefcasing 2, provided with a va vc 3, prefprovided with a centra stem 4, which extends axially of and projects beyond the valve at thereof, one end of said ystein extending through any suitable packing, casing 3, to a point above the casing, and being engaged by a retractile spring 5. Any suitable bracket 6 is carried by the casing 2, and extends beyond the upper 'end of. ythe spring 5, and a bolt 7 is supported on the bracket 6, by 'an adjusting nut 8. The nut 8 is preferably normally 'retained against movement by any suitable lockvnut 9. y The s ring 5 may have its tensiQn increased or i ecreased 'by longitudinal movementof the bolt 7, and in practice I preferably adjust the bolt 7 for giving the required tension to the spring 5 for normally maintaining the valve 3 in an open condition. The opposite end ofvthe stem 4' projects through a packing vcarried by the lower side of the casing 2, and preferably pivotally engages ,the core 10 of a solenoid 1].y The solenoid ll may be of any suitable type, but by preference consists of the usual Windin'gJZ, surrounding core 10. Core 10 is longitudinally movably mountedvwithin the winding and is preferably substantially one-half the length of thc helix, the other vhalf of the space within the helix, orxwinding l2, being taken up by a core section 10u. The core section 10a is adjustable within the helix and isengaged by pted toinove the said core section longitudinally 'within the arranged valvel the valve` ,70 each end carried` by y alinenient andare in line with the longitudispar kupon the pressure controlling valve for the reason that so much sparking is produced by 'with adjusting means for the core section 10a,

of current in the solcnoic helix.

.sure through pipe 1. The pipe 1S communihelix for increasing or decreasing the reluctance of the path of the magnetic flux. For I the sake of centralizing the lines of force, a preferably soft iron casting 14 incloses the helix or winding 12. yThe solenoid 11 is preferably supported by brackets 15, fixed and depending from the casing' 2.' Thee posite terminals of the helix 12 are preferablv,v connected with binding posts.16-16.

j ["ronithe foregoing it will be' observed that when the solenoid 11 is not supplied with current, the spring will maintain the valve 3 in an open condition, and when current is supplied to the solenoid the valve will be moved to a closed condition. The adjusting means shown and. described for varying the tension ofthe spring 5, together makesit possible to carefully balance the solenoid against the spring, the ad'ustment of the core section varying the reluctance vof the path for the magnetic flux, 'and thereby varying the degree of pull upon the core 10. In practice of course, .the solenoid lmust be capable of exer. ing a pull on its core 10, equal to approximately twice the pull on the spring 5, and, as the parts are in exact Vnal axis of the valve 3,.the said-valve will readily lrespond to the solenoid, or to the spring, according to the resence or Vabsence YIn .practice I find that thesolenoid11. requires a current of su'flicie'ntly high potential for reducing an objectionable amount of king, if the switch employed for making and breaking the circuit is operated-slowly. The prior-art includesapparatus involving a gage for moving an electrodeinto contact with aisecond electrode, but l iind that such a vparatus is undesirable for use in connection with a solenoid designed -to act directly the slow making and breaking of the circuit as to burn and destroy. the electrodes. t

By the a paratus best seen in Fig. 3*, I obviatetlie o jections above noted and eliminate substantially all sparking. The apparatus is preferably arranged in any suitable cabinet 1.7. A pipe 18 is ein loyed and leads from the boiler being heated) by the furnace whose draft apparatus is supplied with prescates with any ordinary type of pressure gage 19, which gage is supported in position b a block 20, fixed to one end thereof. The b ock 20 is preferably hollow and constitutes the means of communication between the. pipe 18 and the gage, the said blockbeing xed to a bracket, not illustrated, which pro* -ectsv from plate 21 and which is preferably integral therewith. A bracket 22 is carried by plate 21, and pivotally carries a depending arin 23. The arm 23 is preferably of noninagnetic material, but isa good electrical conductor. The said arm is, as illustrated, preferably of relatively great length, and normally hangs in the line of gravitation. Ata comparatively short distance from the pivot of the arm 23, said arm is pivotallyengaged byone end of a sleeve ,24. j The sleeve-24 telescopically incloses a iod 25, and carries a A set screw 26, adapted to engage the rod 25 at various )oints of longitudinaladjustment of said rodfor locking the i'od against movement independently of the' sleeve. The free end of the rod `25 pivotally engages the free end fof the gage '19.- A right angle bracketl 27 is fixed to tliecabinet v17.near the lower end of the arm 23, and is rovided with a horizontal slot inclosing t-he l) guiding same in its movement. The-said lower end is provided -with a contact point 28, preferably of platinum, said pointbeing disposed contiguousto a similar point 29, carried` by a suitable adjustablebarfor rod 30, said rod being engaged by an adjusting set screw 31 for retaining same at various oints of longitudinal adjustment. -Tlie rod is also engaged by a wire 32 oi" other suitable electrical conductor, which extends -.to the` post 33 of any .ordinary type of elec' 34. The opposite binding post 35 binding trical cel of said cell is engaged by a wire or other suitable conductor 36, which extend to a binding )ost 37 of an electro-magnet 38, the opposite binding post 39 of said magnet being engaged by a wire or other suitable electrical con'- ductor 40, which extends to and engages with the pivot of ,the arni- 23. The adjusting screw 41 is threaded through a bracket 42, arranged on the plate 21, contiguous to the ower Yend of the arin for arni 23, and the said screw 41 preferably carl. ries a lock iiut`43, for retaining the screw at `various points of adjustment.

At the opposite side of that arm 23, a lug 44, projects laterally from the plate 21, and prevents the arm from swinging too Vfar rearwardly.

It is -to be especially noted that inpractice the pivotal connection of the sleeve 24, with the arm 23, is as close to the pivotal support as it is practical tov make the saine, as thatJ the slightest movement of the sleeve 24, and

coi'inected parts, will )reduce a relatively great movement of' the Ilower 'end of the arml 23, the set screw 41, being employed for controlling to a iiicety the amount* of movement iermitted, so that the electrode 2S will not )e permitted to strike electrode 29 with sufficient l'orcc to do injury to either. rFlins any l'uctiiaiion in pressure in the gage 19 will quickly produce operation of the parts. [f the pressure rises above the desired point thc expansion ol' the gage 19, even to a very slight degree, will swing the arm 23 out ofthe line of gi'avital l'orce sufficiently for produc,- ing contact of electrodes 2S and 2S), and closjing" the circuit of the electro-magnet 38. WVhen the pressure is reducedto normal,a re-v tract-ion of t-he gage 19 will permit the arm l23 to bane its free end drop .by gravity-away from 'electrode 29, and the contact is thus broken. ,A quick actingcontact making and breaking apparatus is thus provided, but the faction is not suHiciently'quick to justify the employment of such apparatus for control-1 ling` the circuit of solenoid'll, andthe said apparatus'is'therefore employed asindicated forgoverning the local circuit, and, as will be thereinafter fully specified, for controlling the solenoid-'circuit bytcontrolling of' the local circuit.,y i Fixed tolthe cabinet 17,.above and at one side` of the electro-magnet 38, is asuitable bracket.45,ffwhich pivotally supports alever 46,the said leven being provided at one endwith the armature 47, sus ended above and contiguous -to` oneend of t e core of' magnet 38. iThe lever 46 is guided in its movement ;l y .a.suitable guideffbracket 48, constructed similartobracket 27, but disposed vertically insteadof horijzontal. The end'of the leverv l 46 beyondfiethe bracket'isvprovided with an `ranged contiguous to a similar electrodeE 50, carriedbgr-a rod of bar 51,#adjustablyen-AA gagfed by a setscrew 524 of any ordinary ty e; The rod 5 1 is engaged by a..wire or ot er suitable electricalcondctor 53, which ex- ,.:tendsJto one of.v the binding posts 16. .Elec- V. i tric wire, or other suitable conductor, 54,` engages` lthe arm 46. near the electrode 49, and

extends to one pole or anysuitable battery,

o'r other source l'of .electric energy 55, the rvother pole of the battery or other` source of .electric energy being engaged by a wire, or other suitable conductor, 56, extending to the other binding ost 16. I f l The operation oi) the parts w-ill be largely obvious, but yitmay be pointed out that '.wl'renl Athe local.l circuitis closedby the swinging of. tl'le'arm 23, through the expansion of the gage 19, .the magnetizing of lthe core omag-- net 38- will produce downward movement of J ,-the arfrna tl1re.47, which )reduce a sharp,`de cisive movement of the electrode 49 into con.-l tact with the electrode 50.` .As soon as the contact is made,y current Hows 'from battery 55, to cond} 1c tor576, to helix 12, to conductor l,53,1 and tog rod 51 througlrthe contacting i* elcctrodestoconductor 54,. and back to bat.- tory,y The core 1 will be drawn downwardly, with suilcient force for pullinggtlle Valve' to a closed condition, and tbe jvnlve'will rc-v .main closeduntil thercductionin dral'l nvill V- "sullif-,iently reducey tlie; ternperatnre ol' the.' furnace ,lor lowerirh-tbe rassure .in thm boiler. to normal., atjwbicbftnne tbe gage lf), will'return to its former condition and the contact'between thc elcrtrodes 28 and 211i will be broken, 'llie armature 47 will thus l be released and the Contact between lthe electrodes 49 and 50 will be broken, releasing `thecore 10, and pernnttlng the the valve to its open condition.

It .will be observed that the magnet 3S proV1ded with a helix of low resistance,'an`d spring to lift motive force from,l cell 34 may be of llow potential, whilethat of batterv-55must be of comparatively 4high potent The quickl i operation of the lever' 46 lshortens the durationof thesp'arkbetween'fthey contacts re- 'i gardless of the potenti al ofthe'current inthe i circuit -iclosed' thereby:

ltively low amper'a'ge ofi the current from a- -single cell inithe circuiti 'closed by the arm insresrthat` there' willbe but) little,v sparking point offtheelectrbdes' or contacts 28 andze.

Aslseen in Ficsjlfand 4', 'I"})rovi(le fvalvcs G0/'and 61 wh'ric 1t-'are adapted toi positively :pressure'fof pipe -1. In

.at the control. the steam Fig. .4 it will be seenithat`a by-pass '62 leads and extendsv to Sand communicates with `the y'p.ass 62 is provided with a valve 613 "simi--v larfY 1n construction 4an(l';"`a`rran ement t-o passage of steam plessure througlrtlxc*by-- )rev llltly* -pipe 1, "but, said by-pass assi The bypass may be madey of any erred size and is illustrated as being slig smaller than` the lfrom the'pip'e 1 atlonel side of the valve 60 9'0 ipel lat apoint beyondthe valve 61. The

valves 60 and 61,'and adapted to control the;`

may, of' course,` if desired', be made/oi theV same size as pipe 1 lsowas to be able trrpermit l'the passageof---thcI full head of steam when the'valves 60 and 61 are/closed and the `valve* 63 is open. In practice, I'ordinarilyopen the valve only tofasullicient extent lor lnsurmg they passage of. suliiclent steam rfor slowly operating the lnn engines rfbl`owors witliout-materially .alici-[ting the draft or anything occurto tbevalve Irwbicb makes `repairsnecessary,the valves 6() and 61 lnav.

be closed and the-Valve 63 opened to the full extent and -the parts loft inthis conditionf while the repairs arobeing made with rcs )ect to the valve 3 or thc connected partsf. l bile* the repairs are being made, ol`.i-onrsc,-the

' valvef may be manually operated forlgov- `erningg, the dral't apparatus*l'r)rcontrr-)lling lnorder to prevent tbc-moisture.of

rlvnsation from fallingnponparts ofthe-sw lenoid I-land in'jnringztl-iesame, I preferably proyid suitablebaiiles-64 and l-zarrangedi above llwaolenoid and disposed for receiving drippngs anddlroctmg tbe same beyond tbc parts o1' the solenoid which may bc injured thereby.

In Figs.. 5 and 6, I have illustrated a modiiied forni of the valve controlling mechanism, in the said 'ligures the pipe 1 is provided with a valve casing 2^ cont .ining a valve 3, said parts being..constructed and arranged similar to the corresponding parts of the structure shown in Fig. 2. Valves 60 ,and 61 are also employed for the reason stated with respect to valves (Sound 61, and the bypass 62 is arranged and adapted to operate in a manner simi ar toby-'pass 62, a suitable hand valve 63 being provided for controlling the steam passing through by-pass 62. A valve stein 4 cngagestlie valve 3 and extends through any suitable packing gland; A bracket or supporting frame 15 is connected with valve casing 3', and the stein 4. extends through the crossbraces of the i'ranie 15 and is surrounded by av spiiiig 5 which is .fixed at one end oi said cross brace'and extends downwardly to :andiixedly engages a swivel block G6 which is aperturedior permitting iree passage therethrough of the tube 67 which tube is -iixed to stein 4. The block 66 is formed with a suitable annular -iiangexor r bead 6S,.secn in dots in Fig. 5,

which bead engages a Ysuitable undercut annular groove in a iiut 69, which is threaded on 'to the tube 67. The stem 4 extends throughout the length of the spring 5, and

pre

The solenoid 1l" is.supportcd by the arms ol" the bracket of frames l5', the said solenoid being constructed-and arranged similarly to .the solenoid 11. The pipe 67 is iixed at its end opposite that engaged by the nut 69 to the' coupling 70, and it `is thus apparent that when the nut 69 is rotated the -b ook 66 will be moved longitudinally oi" ste-m4 and thel 'is possible toariange both on the saine side of the valve', the advantage ol this invention being present in any embodiment employing' a spring and solenoid'acting against each other and being arranged in axial aliiieiiient with the valve. f

The modified structure has the advantage of obviating the use of one of the packing glands, and eliminating. the friction occasioned thereby, but the balanced action in the modified structure is not as' 'perfectas that in the structure having thc spring and solenoid on opposite sides'of the valve.,

Having thus fully described myinveiition,

what I claim/as new and desire to se fire ,by LettersPatent iszpi'occts into the pipe 67, the said steinby erence extending through the pipe and engaging a coupling 7() suitably connected. 'with the core 1 ()"of a'solenoid 11.

circuit of the solenoi 1. In a pressure' governor, the combina- (i5A tion with a steam supply pipe and a balanced valve for governing the iiow therein, of an electro magnet connected with and adapted to actuate said valve, a main circuit for said magnet, a pivoted arm interposed in said cir- 70 cuit and disposed substantiallyhorizontally and overbalanced on its pivot for retaining the circuit normally open, an electro magnet for swinging said arm upon its pivot for closinir said circuit, a local circuit for said second mentioned electro magnet, a relatively long pendent arm interposed in the local circuit and pivoted atits upper end in position for hanging normally in the line of gravitation and adapted to swine' upon its pivot out of 80 such line for making tlie said local circuit and to swing back tosaid line for breaking said circuit, and a gage connected to said endent arm substantially at its upper end an adaptedfor swinging the arm out of the line-of gravitation relative to the pressure in said steam pipes'upply. L

2. In a press'. re governor, the-coinbina 'tion with a pressure supply pipe and a valve for governing the flow therein, of a spring connected with said valve Vfor retaining the .saine normally in' anopeii condition, means .adjustably supporting said. spring for varying the tension thereofya solenoid for moving said valve in a direction opposingv the 95 pressure of the spring, the core .of said solenoid being formed in sections,4 meansfor adjusting one of said sections for varying the degree ofpull of the solenoid-independently' of thc spring, anda '3. I n a pressure governor, the combina-4v tion with a steam supply pipe anda valve foigoverniiig the ilowtlierein, ofan electro magnet ,of relatively high'resistance for 'ac- '105 tuating said valve, a main circuit for said magnet, apivoted arm interposed in said circuit aiiddisposed substantially horizontal 'andadapted to have one of its ends swunr vertically for opening and closing tlie sai i10- iiiaiii circuit, .an armature` connected with i said ariii, an electro niagnetadaptedto operate said armature for swinging said arinfor,l closing the said. Imain circuit,v`a local `circuit i for said second mentioned electro magnet, a relatively lone pendent arm' pivotedl at its -upper end and adapted to be swung upon its pivot for-breaking and making the said locaz circuit at its lower end, the `said relativelyr lon .pendent-arm being suspended nor; tally 12:1)v

in t e ,lineolgravitation and when so suspendedl retaining the local circui-tinav broken condition,` and a .gage connected with the' j 4said pendenti` arm Ycontiguous 7to the pivot thereof for swinging' the arm' relativeto the 12a .pressure in said steam supply pipe.

" ,4. In a pressuregovernor, the combinal y tion with-a steam' pipeand a valve forgov'- gage for controlling the i00.-

f @eef/12 5 erning the flow theieiu, of e spring Connected with said valve for normally retaining the l same in an open condition, a slenoie'. lnwing its helix fixed with respect to the valve and its core connected to the valve, means for varying the tensin` of said spring' independenbly of the solenoid, .mesme independent of the spring adjustable. within the helix: for vsil i rying the-pull of said core, and a gage for governii'ig the cileuit 0f said helix. i0

In testnnony whereof I aflix my signature in the presence of two Witnesses.

l WILLIAM MCCI'JAVE. n Witnesses:

C. Pi SMITH,

E. WHITMQRE.

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