US2621720A - Air-cooled gas burner - Google Patents

Description

Dec. 16, 1952 D LT 2,621,720

AIR-COOLED GAS BURNER Filed Dec. 2, 1950 IN V EN TOR.

Patented Dec. 16, 1952 AIR-COOLED GAS BURNER Homer D. Dufault, Easthampton, Mass., assignor to Heatbath Appliances, Ine., Indian Orchard, Springfield, Mass., a corporation of Massachusetts Application December 2, 1950, Serial No. 198,879

3 Claims.

rected to the provision of a burner construction which is characterized by a means for cooling the same and for supplying secondary air thereto for combustion.

Heretofore burners have been rendered unserviceable and combustion has been rendered inefficient due to the heating of the burner. With a temperature in the neighborhood of 500 F. prevailing at the burner, gas breaks down to the extent that there is carbonization such as impairs the desired complete combustion. The burner is injuriously affected thereby.

According to this invention, the burner is formed so that it is maintained at a temperature considerably below 500 F. by the action of air which is utilized as secondary air whereby the burner not only has a very long useful life but the most efiicient combustion is obtained.

Burner temperatures are far more critical on the yellow or luminous type burners than they are on the Bunsen flame type burners. The Bunsen type flame burner usually has a conventional Venturi tube in which the gas orifice draws a considerable amount of air, which is usually at room temperature and helps considerably to cool the burner. This is usually known as primary air. Therefore, the Bunsen type of burner will normally have cooler operation than the luminous flame type unless it is enclosed in a combustion chamber which reflects considerable heat on the burner heads that will cause incom plete combustion.

The burner of this invention depends totally upon secondary air for combustion. This type of construction uses no primary air and for that reason is subject to much higher operating temperatures.

By means of this invention, 1; use the secondary air needed to support combustion around the flame by the flame velocity from each burner port to pass through the ducts. The surrounding parts of these ducts are an integral part of the burner and aid in the cooling of the burner tube.

The burner of the invention is adapted for many and various purposes and particularly for use in connection with gases of various types.

All of the above objects I accomplish by means of such structure and relative arrangements of parts thereof, as will fully appear by a perusal of the description below and by various specific features which will be hereinafter set forth.

To the above cited and other ends and with the foregoing and various other novel features and advantages and other objects of my invention as will become more readily apparent as the description proceeds, my invention consists in certain novel features of construction and in the combination and arrangement of parts as will be hereinafter more particularly pointed out in the claims hereunto annexed and more fully described and referred to in connection with the accompanying drawings wherein:

Figs. 1 and 2 are plan and side elevational views respectively showing a burner embodying the novel features of the invention;

Fig. 3 is a sectional elevational view on the line 3-3 of Fig. 1; and

Fig. 4 is an end elevational view of the burner of Figs. 1 and 2 shown in association with side plates.

Referring now to the drawings more in detail, the invention will be fully described.

The burner 2 of the invention as shown in the drawings includes an end head portion 4 for connection to a gas supply, control mechanism, pilot and the components usually used with burners for gas.

A burner bar 6 extends from the head 4 which has an elongated bore 6f closed in some manner at its outer end, as by a plug 8.

Circumferentially spaced rows of spaced ports are provided in the bar 6 which extend outwardly, from the bore thereof as shown in Fig, 3.

Preferably the axes of the ports of the rows thereof will be disposed relatively angularly so that said axes intersect a vertical plane passing through the longitudinal axis of the bore and above a horizontal plane passing therethrough.

A suitable angle a has been found to be in the neighborhood of degrees.

Upper fins l2 integral with the bar 6 extend horizontally outwardly therefrom and. a lower fin it extends vertically downwardly therefrom s in Fig. 3.

p The fins absorb heat from the bar as it is heated during combustion and tend to dissipate and reduce temperature of v the entire structure and maintain it well below 500 F.

Burners of the type to which the invention relates are usually disposed in apparatus with which they are used so that the burner bar extends horizontally between plates P with narrow air passageways S at opposite sides thereof as shown in Fig. 4. This is so that air may flow upwardly and wipe across the bar.

According to this invention, the horizontal fins 12 not only provide surfaces of large area for dis- .sipating heat but the vertical fin l3 provides additional surfaces and serves to support and reinforce the burner bar against any tendency to warp. Altogether therefore the fins cooperate to provide surface areas and reinforcement for the bar.

As an added feature the horizontal fins I2 are provided with longitudinally spaced ducts extending vertically therethrough. These ducts provide a multiplicity of surfaces which altogether provide a very considerable surface area.

In operation of the burner, air flows upwardly through space S so as to wipe across the fins and burner bar and to pass through the ducts H and wipe the surfaces presented thereby to cool the structure and at the same time serve as secondary air for the combustion of gas requiring secondary air. The flow of air is indicated by the arrows in Fig. 4.

The construction is such that sufiicient air is presented so that by the wiping action of air the temperature of the structure is held below that where carbonization results wherefore the burner operates for maximum efliciency over a lon useful life.

The burner may be formed from ceramic material or from metal as may be desired. Ceramic material will be preferable but it is not desired to be limited thereto.

The invention may be embodied in other specific forms without departing from the essential characteristics thereof. Hence, the present en-- bodiments are therefore to be considered in all respects merely as being illustrative and not as being restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all modifications and variations as fall within the meaning and purview and range of equivalency of the appended claims are therefore intended to be embraced therein,

What it is desired to claim and secure by Letters Patent of the United States is:

1. A gas burner construction adapted for disposition horizontally in a combustion chamber comprising in combination, an elongated burner bar having an elongated bore and provided with circumferentially spaced longitudinal rows of relatively spaced ports extending from said bore through the upper side thereof, continuous longitudinal fins at opposite sides of said burner. bar extending substantially throughout the length thereof disposed in parallel planes parallel to a plane extending through the longitudinal axis of said burner bar, and a longitudinal fin extending downwardly from said bar substantially throughout the length thereof disposed between said first named fins and at right angles to said first named fins, said first named fins provided with longitudinally spaced ducts therethrough for the passage of air in directions at right angles to a plane extending through the. longitudinal axis of said burner bar.

2. A gas burner construction comprising in combination, a head, an elongated burner bar extending from. said head having a longitudinal bore provided with a longitudinal axis, a continuous elongated side fin extending along and radially outwardly from opposite longitudinal sides of said burner bar disposed in parallel planes in parallelism with a plane extending through the said longitudinal axis and below the plane of an upper side of said bar, a continuous elongated lower fin extending along and radially outwardly from a lower side of said burner bar disposed between and at substantially right angles to said side fins, said burner bar provided with circumferentially spaced longitudinal rows of relatively spaced ports extending therethrough from the bore thereof and disposed at the upper side of the bar between the side fins, said side provided with longitudinally spaced ducts therethrough for directing air past the burner tube in planes at right angles to the longitudinal axis of the bore.

3. A gas burner construction according to claim 2 wherein the ports of the burner bar have longitudinal axes arranged whereby the axes of i the ports of the rows thereof are disposed at opposite sides of a plane extending vertically through the longitudinal axis of the bore of the burner bar and at right angles thereto and converge downwardly in said plane and at a point below the upper side of said bar.

HOMER D. DUFAULT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Grayson Jan. 29, 1929

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