US2381152A - Oven burner lighter - Google Patents

Description

Aug. 7 1945. E. F. DUPUIS OVEN BURNEP; LIGHTER- File d Jan. 25, 1941- I F a fizverzrr fizz in I u,

Patented Aug. 7, 1945 UNITED STATES PATENT OFFICE.

OVEN BURNER tren'rnn Ervin F. Dupuis, Detroit,- Mich., asslgnor to Borg- Warner Corporation, Chicago, 11]., a corporation of Illinois Application January 25, 1941, Serial No. 375,885

512mm. (01. 15s 115) The present invention relates to burner lighter assemblies and particularly to an improvement having special application to heavy gas oven iumers. I

A special problem of lighting has been found to exist in heavy gas burners of the type wherein the flame is fed by a plurality of generally dOWIl-r wardly directed orifices or heavy gas discharge ports. The heavy gas appears to gather in stagnant pockets preventing the necessary mixing of air therewith for ready and eflicient combustion.

As a'solution to this problem I have found that by providing the necessary means for effecting the proper mixing of a small supply of this gas of gas therefrom and effecting the requisite movement of the same into mixing contact with the necessary airto constitute a readily combustible charge responsive to a small igniting flame such as a match. I Y

It is a more detailed object to provide a new and eflicient arrangement of means for accomplishing the above result which means is simple in operation and inexpensive to manufacture.

Other more particular objects, advantages and uses of my invention will become more apparent from a reading of the following specification taken in connection with the appended drawing forming a part thereof and wherein:

Fig. 1 is an assembly view-of a preferred form of my invention showing the burner turned over on its back 180 from the normal position occupied thereby for the purpose of clarity in description;

Fig. 2 is an enlarged broken away plan view showing to advantage the burner and lighter in assembled relation;

Fig. 3 is a vertical section view taken substantially on the line 3- 3 of Fig. 2;

Fig. 4 is an enlarged section view of one premg stack;

ferred embodiment of the auxiliary stack or accelerator structure; 1

Fig. 5 is a broken away section view corresponding to Fig. 3 but showing the auxiliary stack or accelerator cast as an integral part of the burner;

Fig. 6 is a section view corresponding to Fig. 4

but showing a slightly modified form of accelerat- Fig. '7 shows a modified form of flame travel producing construction embodied in the auxiliary stack or accelerator.. i

Referring in greater detail to the figures of the drawing, there i shown in Fig. 1 a heavy gas with air and further effectin the movement 15 burner and lighter assembly therefor. For the thereof upwardly through a primary stack or purpose of clarity in description the assembly chimney that the same responds'quickly and efflhas been turned over on its back through .ciently to a. small lighting flame such as that from the position that the same will normally provided by a match applied at the upper teroccupy when installed in an oven. The burner minal of said primary stack the heat of which '20 proper is indicated generally at l0 and is formed is effective to create a pressure diflerential. This with a plurality of heavy gas discharge ports ll small mixture charge of air and gas upon being for feeding the burner flame, these discharge lighted supports the necessary, initiating flame ports being directed generally downwardly when which travels. downwardly through the primary the burner is in its normal position. For the stack in turn igniting the gas discharging through 23 purpose of solving the lighting problem found to the adjacent downwardly directed discharge port exist where-heavy gases are employed such for thus effecting the lighting of the entire burner. example as those known as liquid petroleum gases It is therefore an object of the present invenand including propane, butane, and others, I tion to provide means in combination with a have provided a special arrangement of means heavy gas burner for picking up a small supply 30 indicated generally at l2.

Referring particularly to Figs. 2 and 3, a preferred embodiment of my assembly 12 includes generally an upwardly extending primary stack I5 eflective'upon the application of a flame t0 the upper terminal thereof to produce a draft; stack l5 has an inlet port l6 at the lower end thereof, and an upper openterminai indicated at l I. The inlet port l6 is disposed in closely ad-- jacent but spaced relation to the side periphery of the burner inthe general varea 01 at least one of the downwardly directed heavy gas discharge ports ll, while the upper open end of the stack- I1 is located at an elevation above the burner. The result of this arrangement is to produce a draft passing up through stack l5 upon this application of a flame at stack terminal l1.

Tl llS air in passing through the space between the burner and the stack and into inlet port I5 mixes with the otherwise stagnant heavy gas in this area thus producing a combustible mixture andlifting thesarne up along the inside of the stack l5 to outletl'l. The flame travels down the stack vor chimney IS with the result that the heavy gas discharging from downwardly directed ports II is thus ignited. A port [8 is formed in ber 33. The opposite end of nipple 3i attached to the burner III in any appropriate manner as for example through the medium of and further that the accelerator 30 is formed with downward flame travel providing means therein. In Figs. 2, 3 and 4 this flame travel radially extending protuberance 19 and attachv ing screw 20 and oppositely extending protuberance 2| may function to support the forward side of the entire assembly in the oven or burner compartment (not shown).

I have found that the operation and eifectiveness of this type of lighter are very much improved by the provision in combination with the above described primary stack of a, novel and improved arrangement 30 for effecting the removal of heavy lighting gas from th burner er terminal l6 of the primary stack IS. The arrangement 30 illustrated in Figs. 1 to 4 comprises generally a horizontally extending tubum lar'nipple 3| arranged to be mounted in an opening 32 formed in the wall of the burner l0 and communicating at the inner end with the heavy gas supply within annular burner chammerges with a, generally vertically extending crosspassage 34 defining an auxiliary stack or chimney open at both the top and the bottom thereof. This arrangement 30 functions to withdraw a small supply of the heavy gases from chamber 33 through nipple 3| and to mix the same with the rapidly moving small stream of air being passed up through auxiliary stack 34 at the time a flame is applied at I! to thus create a differenc of pressure and to deliver the same well within the influence of the vertically moving air stream passing into inlet port It of primary stack i5. As a matter of fact, some small portion of the heavy gas passing from annular cha nber 33 through the horizontal conduit of nipple 3| may drop down through the auxiliary stack and out the lower terminal portion 34 thereof, and in addition some small portion may also pass out through the forward perforation or slit.35 in the vertical wall of the auxiliary stack 30. This is not enough, however, to prevent the proper functioning of auxiliary stack 30 for the purpose intended. The above described limited. portion of the gas not immediately elevated by the draft passing up through'auxiliary st'ack- 3|) may subsequently be picked up by passing into the low er inlet terminal portion 16 of primary stack I! or some of this gas may remain to be burned in the flashback of the flame subsequent "to igniting the mixture by the application of a light t the upper terminal portion I! of prima tack l5. That portion of the gas re-' maining immediately in the area of the slit 35 will be burned'to deflne a flame path leading from the upper portion, ofthe auxiliary stack stack inflame communication with the gas being discharged from downwardly directed discharge ports A'ny tendency that might otherwise exist for the heavy gas to form relatively dormantor stagnant areas in-or about in-' let port I6 is thus broken upby the arrangement 30.

means comprises a coaxial slit in the sidewall of stack passage 34. This slit 35 functions to allow the downwardly traveling flame to pass down the accelerator 30 across the lower end thereof and thus ignite the heavy gas discharging from the associated burner discharge port Turning to Fig. 5, a somewhat modified arrangement is disclosed differing from the showing of Fig. 3 in that the accelerator assembly 30' is formed as an integral part of the burner assembly rather than as a separate element added thereto. The form of my invention shown in Fig. 5 is particularly adaptableto the manufacture of original equipment, while that of Fig. 3 is particularly suitable where my improved accelerator is to be incorporated in the conventional form of burner already manufactured and on the market.

In Fig. 6 there is shown a modified form of auxiliary accelerating stack or chimney 33' the same being in the nature of a venturi for the the acceleratports' 35'. i

From the above it will be made to appear that the success in the operation of the present burner and lighter assembly is explained on the basis of the upward acceleration of the mixed heavy. gas and air to the lighting point i1 and the proper mixtur of air for carrying the flame back downwardly to the burning port of the burner from which the main supply of heavy gases is being discharged.v

While my invention has a broader application,

' I nevertheless note that particularly. gratifying 30 therearound to a point'below the auxiliary results on a wide scale numbering in the thou- .sands of successful commercial installations. are

now in use in oven burner assemblies. The confined, somewhat inaccessible space, and limited air circulation withi a range oven appears-to lend very outstandin -s igniflcance to the successful manner in which my invention functions in connection therewith. a

While I have disclosed my invention in connection with certain specific embodiments thereof, it is to be understood that these are by way of example rather than limitation and'that the scope of my invention is to be defined by the appended claims.

I claim: 1. In a heavy gas burner and lighter assembly therefor including means defining a burner housing formed with a generally annular heavy gas receiving chamber, the lower peripheral wall of said housing being formed with generally downwardly extending gas-discharge ports for feeding and directing heavy gas downwardly to a flame therebelowwhen ignited, said lighter. assembly comprising means readily accessible from above said burner housing for accomplishing the lighting of the gas discharged from said ports therebelow, said means comprising means forming a first primary stack including a generally vertically extending bore having a funnellike open mouth portion disposed adjacent the side peripheral wall of said burner housing adja'cent saidgas discharge ports but spaced there-.

i from sufliciently to permit of the air thercbelow as well as the gas being drawninto said stack, said vertically extending bore terminating in an upper open end readily accessible for exposure to a lighting flame, the combination therewith of additional means for directing gas from said a n c amber, mixing the same with air, and delivering the resultant mixture to said funnelshaped primary stack inlet, said means including a generally vertically extending bore defining a secondary stack, a generally horizontal conduit placing said chamber in communication with said secondary stack intermediate the ends thereof, said vertically extending secondary stack being arranged with the upper terminal portion thereof in the area of said funnel-like open mouth portion of said primary stack, and means defining a perforation in said secondary stack forming a flame travel path for conveying a flame from the upper portion of said secondary stack to the lower portion thereof and hence into position where the same becomes effective to light the gas being discharged from said downwardly directed gas ports in said burner.

2. The combination of a, heavy gas oven burner and lighter therefor comprising means defining a burner housing formed with a generally annular heavy gas receiving chamber having a series of downwardly directed gas discharge orifices in the wall of said chamber for feeding gas downwardly to a flame therebelow when ignited means defining a lighter assembly for said burner including a primary generally vertically extending tubular stack having an open upper terminal portion located at an elevation above the elevation of said burner housing, said primary stack having a generally funnel-shaped lower terminal inlet port disposed closely adjacent to, but spaced from a peripheral side wall portion of said gas chamber to thus allow a free draft of air to pass upwardly into said primary stack inlet port and out of said upper open terminal portion thereof when a lighting flame is introduced at said upper terminal portion thus creating a pressure differential, means effective to direct gas from said gas chamber and discharge the sam into the air in the area within said primary stack inlet port to be conveyed upwardly by said air moving through said primary stack upon said introduction of a lighting flame, said means including a generally horizontally extending hollow nipple sealably received in a complementary opening formed in the side wall of said gas chamber, a generally vertically extending secondary draft, producing auxilary chimney or stack intersected by said nipple intermediate the terminals of said auxiliary stack and including a wall formed with a vertically extending slit therein constituting a flame travel path, said secondary stack having a cross-sectional area and a height each of which is only a small fraction of the corresponding dimensions of said primary stack.

3. The combination of a heavy gas oven burner and lighter therefor comprising means define ing a burner housing formed with a generally annular heavy gas receiving chamber having a series of downwardly directed gas discharge orifices in the wall of said chamber for feeding gas downwardly to a flame therebelow when ignited, means defining a lighter assembly for said burner including a primary generally vertically extending tubular stack having an open terminal portion located at an elevation above the elevation of said burner housing, said primary stack having a generally funnel-shaped lower terminal inlet port disposed closely adjacent to, but spaced from a peripheral side wall portion of said gas chamber to thus allow a free draft of air to pass upwardly into said primary stack inlet port and to said upper open terminal portion thereof when a lighting flame is introduced at the discharge outlet of said primary stack to thus create a pressure differential, means effective to direct gas delivery from said gas chamber and discharge the same into the air in the area within said primary stack inlet port to be conveyed upwardly by said air moving through said primary stack, said means including a generally horizontally extending nipple portion adapted to fit tightly in a complementary opening formed in the wall of said gas chamber at an elevation above the elevation of said downwardly directed discharge jets and a generally vertically extending intersecting secondary stack, said stack being further particularly characterized by the formation therein of at least one radially extending orifice at a position generally opposed to the position of intersection of said nipple portion with said stack, said orifice functioning as a flame travel path.

4. In an arrangement of oven burner and lighter therefor adapted to ignite and burn heavy gas, said arrangement including means defining a burner housing formed with a generally annular heavy gas receiving chamber having a series of downwardly directed gas discharge orifices in the wall thereof for feeding gas downwardly to a flame therebelow when ignited, means defining a lighter assembly for said burner including a primary generally vertically extending tubular stack having an open upper terminal portion located at an elevation above th elevation of said burner housing and to which a light may be readily applied for creating a difierence in pressure, effecting ignition and a draft through said stack, said primary stack having a generally funnel-shaped inlet port in the lower terminal thereof disposed closely adjacent to, but spaced from the side wall of said gas chamber to thus allow a free draft of air to pass upwardly into said funnel-shaped inlet port of said primary stack and out of said upper open terminal portion thereof upon said ignition, additional means effective to direct gas flow from said gas chamber and cause the discharge thereof into the air in the area within said funnel-shaped inlet port of said primary stack at an elevation above the elevation of said downwardly directed gas discharge orifices to be conveyed upwardly by said air moving through said primary stack, said last named means including generally horizontally extending conduit communicating at the inner terminal thereof with the interior of said annular gas chamber at a level above that of said downwardly directed discharge jets and a generally vertically extending secondary stack including a wall formed with an opening theret h constituting a downward flame travel path. said secondary stack having a cross-sectional area and a height, each of which is only a small fraction of the corresponding dimensions of said primary stack, said generally horizontally extending conduit communicating at the outer terminal portion thereof with the interior of said vertical secondary stack.

5. In a heavy gas burner and lighter assembly therefor including means defining a burner housing formed with a generally annular heavy gas receiving chamber, the lower peripheral wall of said housing being formed with generally downwardly extending gas discharge ports for feeding and directing the heavy gas downwardly to a flame therebelow when ignited, said lighter assembly comprising means readily accessible from above said burner housing for accomplishing the lighting of the gas discharged from said ports therebelow, said means comprising means forminga first primary stack including a generally vertically extending bore having a funnellike open mouth portion disposed adjacent the shaped primary stack inlet, said means comprising a plug-like member formed with a generally vertically extending bore defining a secondary stack, a hollow horizontal stem portion mounted in a complementary opening in the side wall of said gas chamber, said stem placing said chamber in communication with said secondary stack intermediate the ends thereof, said vertically extending secondary stack being arranged with'the upper terminal portion thereof in the the open funnel inlet portion of said primary stack, and a narrow vertically extending slit in the wall of said secondary stack defining a flame travel path for conveying a flame from the upper portion of said secondary stack to the lower portion thereof and hence into a position where the same becomes effective to light the gas being discharged from said downwardly directed gas ports in said burner.

ERVIN F. DUPUIS.

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