US2111369A - Aeration hood - Google Patents

Description

March 15, 1938.

J. T. MARVIN ET AL AERATION HOOD Filed May 19, 1934 IIl INVENTORS Jol-1N 7. MAev/N 8e Blew-IARD .MATTHEWS WML {ogm- ATTORNEY.

Patented Mar. 15, 1938 UNITED sTATEs PATENT OFFICE l 2,111,369 AERATION HOOD poration of h10 Application May 19, 1934, Serial No. 726,528

l3 Claims. (Cl.'158115) This invention relates to an improved burner bowl and aeration hood for use on gas or like range burners, and `particularly concerns the provision of aeration means on such bowl to dis rect and limit the iiow of secondary air to the associated burner.

The present novel burner bowl and aerationv hood are particularly applicable in connection with flash tube ignition devices, 'in which the l@ burner end of the iiash tube is provided with a gas jet for directing theilow of gas in the initial or lighting stages into the tube toward a constant pilot. So as to insure the correct lighting of the burner by the :dash tube device., the forlb ward end of the latter must be positioned closely adjacent the gas burner lwithin the burner bowl,

and hence the normal purpose of the secondaryr air directing means through the hood destroys the useiul function of the gas jet of the flash lighter du device. In other words, the creation of 'an air i drait as provided by the Idirecting means of the bowl in the'proiximity of the burner end of the iiash lighting tube causes the gas passing through the jet therein to be drawn towards the burner and away from the tube. This naturally defeats the required supply of gas interiorly of the gas tube, and in some instances after the gas has been lighted and the flash tube jet is also ignited, this jet name will be extinguished by the secondary air draft and raw gas will then be fed from the jet to the space between the burner and the bowl. y

This invention has for its primary object to m provide additional means in the form of an im aeration hood associated Awith the bowl and injection end of the flash lighter tube, whereby to overcome the tendency of the secondary air draft within the burner bowl and to obyiate the aforesaid detrimental edects of such secondary air current upon the gas jet within the lighter tube.

In the accompanying 'drawing wherein litreV reference numbers include like parts,

Figure l is a plan View of a burner assembly showing the aeration hood and, y

Figure 2 is a section on the line 2 3 ohli'igure l.

Figure 3 isa section on line t-t oi` Figure 2. lin the drawing l0 indicates the burner bowlY fri the egress of'gas for the burner flame. Above slot I4 is an additional slot I5 communicating with a central open passageway I6 by means of ports Il. From this slot I secondary air is drawn to assist in supporting the ame of the burner. Additional secondary air is drawn 5 through the bottom opening Il in the burner lbowl outside of the burner which aids the other secondary air coming through the slot I5 and increases the eflcle'ncy of the burner. Itr will be readily understood that as the burner heats 10 up a much greater current of secondary air is drawn through both opening Il and slot I5, so that the current obtains substantial, velocity.

The burner I2 has a projection, i8 hollowed out to communicate with gas chamber ld anda port l5 is. provided in this projection I8. Into the port is projected the stem of a jet it supported on the end of flash tube 22. The jet 2d has an opening 2d from which gas may flow whenever it is flowing from burner slot lil. IThe flash tube 22 communicates with a pilot lit so that gas `injected from opening 2d may travel through the flash tube 22 to the pilot 2t where it ignites and 'flashes back through the tube to the burner It to ignite the gas issuing from slot Ml.. As 25 soon as the jet has been ignited the ilashing will end, but the jet of gas at 2d will remain ignited in a very small flame, secondary air for whichv is provided by an opening 2t inthe bottom of the flash tube. This functioning or the herein disclosed flash lighter device is characteristic to the same, and a detailed description may be found in our copending application, Serial No. 711,972, led February i9, 1934.

It will be evident from an understanding oi devices of the present character that a current of air passing through the 'opening 'il in the burner bowl attains considerable velocity, andA when the burner end of the flash. lighter tubeis placed Within this air current the latter is sufiicient to create a draft around the flash lighter tube end, and thus draw toward the burner the gas emitted from the port 23. It has been stated in the-foregoing that in order to insure proper flash lighting of the burner the jet 20 must be arranged closey to the burner port I d. This consequently places the jet 2li and dash tube 22 directly in the secondary air current, and before the present novel invention the use of ash light- 5o ers in connection with burner bowls had been very unsatisfactory. To prevent the flow of secondary air, as above discussed, from blowing out the small ame at 23 or from drawing the gas injected in tube 22 away from pilot 24 so 55 tube toward the pilot light.

that flashing cannot occur, and permitting the escape of raw gas, the .burner bowl I0 is provided with an aeration hood 25. This hood is shown as integral with the burner bowl I0, but it will be readily understood that it could be made separate therefrom. This hood is shaped so as to cover the end of the flash tube and the jet 23, (see Fig. 3), and to deflect the current of secondary air flowing upwardly from opening Il away from the end of the flash tube, so that this air current does not\ act to draw the gas injected at 23 out of the tube to prevent same from passing through the tube to pilot flame 24. The hooded portion 25 is of suillcient size to overlie the burner end of the flash tube of jet 20 and to prevent the air passing upwardly around the projection i8 from creating a draft at the flash tube openings. Without the hood 25, the secondary air Within the bowl would accentuate the secondary air coming through the port 26 and thus draw the same outwardlycf the flash tube into the bowl and away from the pilot 24. The hood 25, by reason of the deflection of the secondary air from the flash tube, is found to effectively prevent the aforesaid diculty. 'I'he slot Il is relatively small sothat the air passing therethrough attains a substantial velocity. It is believed that these theories of operation are combined in the success of this aeration hood. The theories are set out here to facilitate understanding of the device rather than limit the manner of its operation.

In the above detailed description our invention in a new aeration hood is embodied in a heat concentrating plate. The present economic trend, however, is to obtain the maximum ef-` ficiency from gas burners and a satisfactory means is found in the aforesaid heat concentrat ing device which is normally positioned closely adjacent the burner flame so as to prevent the downward circulation of heat from flame. As has been explained, when this plate is used it requires an opening between the same and the burner to supply Athe necessary secondary air.

Several conditions result from this construction which render impractical the use of flash lighting devices in the heat zone or in the zone of the secondaryair current. If a flash lighter device be so usedand without means' equivalent to the present novel aeration hood, it should be quite obvious that the raw gas emitted from the gas jet cannot follow its normal path up the flash 4 Accordingly, in every instance, the flash ignition is materially delayed and in some instances completely destroyed.

In addition to the above functions, the hood acts as a means to prevent objects'spilled from the stove top from clogging the flash tube or its jet 23. 'Ihis is an important feature of the invention, since the operation of the lighter depends upon having a cleartube and clean jet.

It will thus be seen that this invention has provided a means for correcting a very serious difficulty heretofore interfering with the use of flash ignition on ranges having burner bowls. It is to be understood that the device is applicable to all ranges having similar means to control the direction of the heat flow or secondary air flow. It is to be further understood that while a slot type burner has been shown this showing was merely for illustration, since the device is just as applicable to any other type burner of which other type, the familiar star type burner might be mentioned. It is applicable with other types of flash tube igniters than the one shown since in practically all of them an injection port is provided fromy the burner which injection port is intended to remain ignited whenever the burner is in operation. It is further applicable to protect any auxiliary flame that is to be supported in the normal path of secondary air flow. Having described the invention what is claimed 1. In combination, a gaseous fuel burner and an igniter of the flash lighter type therefor, said dishq-shaped concentrator bowl surrounding said "burner and having a hole in its bottom of sufficient size to provide a secondary air space be- `4tween the bowl and burner, said bowl having a lateral hole through its side to receive the burner ternally of the bowl and enclosing the upper portion of the flash lighter projected inwardly of said bowl.

2. As an article of manufacture, a concentrator bowl for gas burners, said bowl beingofgeneral dish-shape and having a central opening in its bottom portion adapted to receive a burner therein, such opening being of suillcient size to provide an air space between said burner and portion of .the bowl comprising said opening, and said bowl having a substantially radially extending portion on its inside, said radial portion comprising a substantially inverted semi-cylindrical shield projecting interiorly of the bowl toward the burner and adapted to cover the burner end of a flash lighter tube for said burner.

3. As an article of manufacture, a concentrator bowl for ring type gas burners. said bowl being of generall dish-shape and having a central annular opening in its bottom portion adapted to receive a burner therein, such opening being of sufllcient size to Vprovide an air space between said burner and opening, said bowl having a lateral hole in its side, and an integral portion on said bowl comprising a shielding element extending from the inside of said bowl adjacent said hole inwardly thereof toward said burner whereby to provide means for receiving and shielding the burner end of a flash lighter tube for saidburner. l

JOHN T. MARVIN. BIRCHARD L. MATTHEWS.

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