Burner control system

June 22, 1954

Filed July 28, 1948

R. B. MATTHEWS

BURNER CONTROL SYSTEM / 2,682,016

Sheets-Sheet 1

<img file="US2682016A_D0001.tif" />

June 22, 1954

2,682,016

R. B. MATTHEWS burner control system

Filed July 28, 194g

Sheets-Sheet 2

<img file="US2682016A_D0002.tif" />

Patented June 22, 1954

2,682,016

UNITED STATES PATENT OFFICE

2,682,016

BURNER CONTROL SYSTEM

Application July 28, 1948, Serial No. 41,129 (Cl. 315—252)

Claims.

in general, to burner particular relation to the type in which an invention relates, systems, and has control systems of....._J±,_{v wuwu an}

,.= . circuit for an electroresponsive valve in the coStrolT/Tto ^{burner is under} iect to toeJ - thermoelectric generator subthe ^{h of a Pllot} burner.

^{the p}l^rtieular systems which I shall deciibe hereinafter m connection with the draw^t^arV^{n genera1}’ ^of the type in which there iΓοΤθη Sa ^C°^nfcr01 °^{f the} thermoelectric generaor an electroresponsive valve in the fuel sunni v mPe for a main burner combined with a thermo⁷terX X^e?r^hUt°^{fl ValVe f0r} the fuel supply be secured it rT? ^{whereby 100} % shutoff may _lg ; I ^{s t0 be} understood that the inventurn in its broader aspects is not limited to this particular type of system, but may be em ^b One nf\b^{ther Systems as} suitable and desirS tio? is tn n® ^mT °^bjeetS °^{f the} Present inven- tion is to provide an improved burner control ‘ system wherein means is provided for utilizing thl P™t flame^{0 subject} to the heat of rne pilot flame to control the flow of current n&lt;Js7^{h an} electron tube, the output of which is » used to control the circuit for the electroresnnn ta the fuel _STOPly „,ρΛΤ^2; tin^¹?^^{1- and more s}P^eciflc object of the invention is to provide an improved burner control ? system wherein the flow of current through the circuit for^Utb^^het°^UtBUt °^{f which c}°ntrols the circuit for the electroresponsive valve in the fuel supply pipe for the main burners coSrofled S¹³T ^passing current generated by the thermo electric generator through a coil located onX tube o^er°(2)^abJ mil·^UXtaP°^{SitiOn to the electr}°ⁿ’.?^r , ^by utilizing m a system of the class cnbed a conventional vacuum tube contain erated° bv^th ^{and applying} the voltage gencontrol grid^{he thermoelectrie} generator to the a ta™^{her obj}®^{ct of} the invention is to provide in a burner control system of the class described “cans operated by the output of the electron stee^evilv°e^Pm to Λ⁰? °^{Pen the} -1^» ta», wheS * which extinguishment of the pilot flame cuts off the flow of current through the eSron tube wtoPh^deeneT^{1Zlng the} electroresponsive valve ' to operates to shut off the supply of fuel to the mam burner. ^{y Iuel t0}

Another object of the invention is to provide m a burner control system of the class described 55

This control burner electric

IS 10 ^{Objects and} advantages of the inv°n descrj on Taken ^{the f}°^Uowing detailed ueduiipEion, taken in connppfinn companying drawings in Th£ θ “' igure 1 is a diagram showing schematieaiiv the parts and circuit connections of one form J »’»«·».· aS °‘ ^{2 a} diagram similar to Figure i othe? ΐοΓίηθο?^{and circuit conne}ctions of an-’ STo? ^{SyStem emb}°dying the present invemTn^rn^{g t0 the} embodiment of the invention shown m Figure 1, the burner indicated for a ^bUmer· ^{K may be} mam burner oi a xoom or space heater, or it mav he too able construction. ^{y suit}bumlr^e| tor^Pthe^Pid^er°^{r C}°^{ndUit 2 leads to the}fuel thereto tor °^{f §aseou}« °r other he ^{purposes of} illustration, the valve 4 by the flow of°^ ^ValVe °^perated to open position coil ’ , ^e thermoelectric safety shutoff valve a jgS==-SS£_;:S =:=?;~.'S£w~ inlet Ta'd ouE^ -“cationTetweS example upon a valve seat aTone end o ’ nas! sage 11 to shut off the flow of fuel for the ma · burner; also the flow of fuel for affiinTt ^l! unity to the burner I. ^{W piox-}

An electromagnet having a magnet frame 14

S,682,019 ixample,

A coil 51 is located physically on the outside of the vacuum tube 39 and connected electrically so that the magnetic field yioouced by flow of current through it opposes tha» produced by coil 43 and thereby allows diode 39 to conhL* The coil 5i is connected in series cncuit relation with the elements of a thermoelectric generator 52 (thermocouple or ^the™°^pde)tl^We?_eofis disposed so that the ^pot junction 53 thereof (or hot junctions) is subject to rhe heai o- the ^P11ln Operation, cocking of the thermoelectric c_afety shutoff valve 8 by depressing tne uutton 19*opens the valve 12, thus admitting gas m me nilot burner 13 which, when ignited, neats the St junctions of the thermoelectric generators ? and 52 In cocking or resetting the thermoelectric safety shutoff valve the flow mten upter vaiv» member 20 moves to closed potion to :£·«?“ e flow « &lt;M to «

I during the resetting operation and until tne nilot 3is ignited and heats the thermoelectric generator 17 sufficiently to hold valw £^&gt;en. Then upon release of burton 19, Y-'^v * .

20* moves to open position, admitting ga» to ^S°Th« teT‘t burner &lt;&gt; _1S « the Μ» thereof also heats the hot junction of the tnexmoelectric generator 52, thus setting up~a ₍of thermoelectric current; tniortto th- - '

Line voltage applied to the primary a voltage in secondaries 31. and 4 7 and a voltage to the elements of diode -J. Coil Jl is, as previously stated, physically located on toe ; outside of diode 39 and is connected_?lecuivaliJ so that the magnetic field proaucea oy toof current set up through it by toe heat of mSlot burner on the hot junction of the thermoetectrte generator 52 opposes that produced by the coil 43, thus allowing dioae xS to γθ-iducu The rectifier 33 also supplies plate volcage to the diode 39, and when coil 51 is energized, tnc dtode conducts and causes current to flow through the conductor 41. _r„_mnVps

Extinguishment of pilot ^bUin®^J- L ~ ..

tbp -ource of heat from the hox junction of the thermoelectric generator 52 which cog, decreasing the flow of current to· the coil I. This decreases the magnetic field ^{ibe cpd}and the magnetic field of me coil takes pie cedence and cuts off the flow or ^CJllePb ^o the the diode 39, thereby deenergizing *ndmlQSing the solenoid valve. This opens the contac 2- g, thereby deenergizing the solenoid valve 4 whicn i operates to closed position shutting off toe supDiv of fuel to the main burner.

^S1 Extinguishment of pilot burner 13 also re^ the'source of heat from the hot junction of toe thermoelectric generator 17 which cools and thereby discontinues or necreases the flow current to the coil 15 of the thermoelectric sa-.^y shutoff valve 3. This valve 8 thereby operates to closed position, shutting off the. supply-of: fuel to the pilot burner 13, and also providesa safety shutoff for shutting off the supply of fu-1 to to.

^S°The¹conductor 41, which leads from the cathode 40 of diode 39 is connected to the grin 6.2 si «μ»» ·&gt;^β,“““Τ·. series circuit relation with the grid 6- of thyxa Son 60 by a conductor 64. The conductor Q5, which is connected to the side of rectiner 33 opposite the side to which conductor 3t is connected is connected to the negative side of a bias cell or battery 65. The positive side of cell 65 is «nd a coil 15 is adapted for holding armature 16 connected to valve 12 in attracted P°^81t“^_ thereby the valve 12 open when the toermo electric generator—such as a thermocouple or , thermopfle—is heated by the pilot flame. When . the pilot 13 is extinguished the electromagneti Which is connected in ™rt with the thermo^ pleeti’ic generator, ceases to hold the open! and this valve moves to closed Position, f° , example, under the action or a spring I8 to. tout off the supply of fuel to burner 1, also the supply of fuel to the pilot burner. nres'sed

A reset button 19 is adaptea m rt pie&amp;.^ inwardly to move valve 12 to open potion with accompanying movement of armature I x m trected position and to holo toe mmarine in »«»«» until «. &gt;M.

to retain ormrtuio IS ““ . „orid_ea

A flow interruptex vaiv- id nw .

for shutting off the flow of fuel to the mam om. χ during the resetting operation ana unto the valve 12 is held in open pos tiou ®^_ed magnet and button 19 is released ana rrtuineci to its outwardly projected position wit*- ac-o nnanyinp oieration of the flow interrupter valve to open position. The details and mode of operaA of a suitable reset and ^mteniuptei valve arrangement are shown and —· · the above identified patent of Clarence .-ntz, X in Charles V. Hildebrecht Patent No. 2 114,446, issued April IS, ¹⁹³³· .,'The pipe 2! for supplying fuel &gt; th- pilo« burner 13 may be connected, xor cxam-L, «s chown more or less diagrammaacaUy d, -2 to the interior of the body of the thermoelec m Sfety shutoff valve 8 between toe aoove mentioned valve seats at opposite en.s of toe pas save IL m tWs ^{way the} ' ¹ , T closed position, shuts off the supply ox κ» · both the main burner 1 and Pilot, omnex -, . fuel flows to the pilot burnei ' -, valve 12 is open and regardless ox^ whet ... inflow interrupter valve 20 is or is nou °P®?

Electric power for operating the। vah- . suoplied from a suitable source ^fprthe line wires 23 of a suitable soui'-e ox altonating current, such as a household current -υ'-mlv fine of the type which averages about -lo ^tove.· to,· O. ·&gt;»““ may be supplied, for example ^py&gt;^he_o^sc^^ winding 24 of a transformer having a p.-marj. winding 25 connected to the line wires 2-.

of a diode. The cathode ¢8 of tuoe 3- 1» con nected ?o the other side ci rectifier 33 by a con^dUX^X rectifier 33· energizes a coil 43 disposed inXxiXy to tube 39 and connected at onn end by a conductor 44 to conduccoi 37 oetwe-n S Stiffer and tube. The other enflm cofl ¢3 is connected to a conductor through adjustable control 46. A its opposite sides connected by condu-to-s w -nd 4° to a heater 59 for the catoode 48.

When coil 43 is energized without energization of a coil 51 to. be presently described, the coil 43 directs, magnetic flux ^1Pie® ^aql_n°₀X 4 etectron travel from cathode 40 to anoae -8 to prevent the tube 39 from conducting.

2,682,016 connected through conductors 66, 67 and 66 and resistors 69 and 79 to anode 71 to parallel ZathodP 72^{de 75 and an}°^{de 76 in ParalIel with}udinoae i&amp;.

One side of secondary 24 is connected by a vatoTT°Vh ^t0,?^{ne Side} °^{f the coil of so}lenoid valve 4. The other side of secondary 24 is conυοηθβί°^Υ^^^0ηάΐ1&lt;ϊ^0Γ ‘^{4 t0 eathode} 75 of thyratron 61. The anode 76 of thyratron 6ί is connected by a conductor 77 to the other side of the in Fteura'i ^s°^len°^{id valve} «· The system shown m Figure 1 also has a resistor shown at 78. The tubes 69 and 61 are shown as provided with heaters indicated diagrammatically at 80.

In the operation of the system shown in Fig- 15 ure 1 the output of diode 39 is fed through the 78^Snrod ^7S’ ^{The fl}°^W °^{f current} through resistor J produces a positive bias on the grids of thvraurons 69 and 61 which are connected up backSSh»-^{6 appllcation} °f the positive bias 20 causes the uiyratrons to conduct, each one conducting wnen the plate is positive with respect to rhe cathode. Tms means that each tube conducts only during one-half of the cycle, causing tne flow of alternating current through solenoid --5 he Γη ^br^{ng Sn A}· ^C· ^VaIve’^{is opened and}bnrnnr ! ““ ^{PaSSage Of fuel} *0 the main

The purpose, of the bias cell 65 in the grid oil cult is to maintain a negative potential on the 30 grics which prevents the thyratrons from firinp· u ^{CUrrent is flowing} through the resistor ^8, this being the condition that exists when the thermoelectric generator 52' is cold and the coil δ· is deenergized. _3;

The system shown in Figure 2 is the same as the system shown m Figure 1 except that the thyratrons 09' and 61' are used as a full wave rectifier, causing direct current to flow through the solenoid valve 4' when current flows through the resistor 78'. The other parts and circuit connections of the system shown in Figure 2 which correspond with the parts and circuit connections shown in Figure 1 are designated by primed reference characters corresponding to those used in. Figure 1. The system shown in gure 2 permits the use of a D. C. solenoid valve i’i.-^Tbe, ^operatj,^on θϊ this system is the same as that described in connection with the preceding embodiment of the invention, and therefore 50 wid not be repeated.

,, ^Tbe embodiments of the invention shown in the drawings are for illustrative purposes only and it is to be expressly understood that said drawings and the accompanying specification are 5.5 no» to be construed as a definition of the limits or scope of the invention, reference being had to the appended claims for that purpose