US1961572A - Gas burner - Google Patents

Description

A. N. ROTH June 5, 1934.

GAS BURNER Filed Jan. 4, 1952 FIG. 2.

FIG. 1.

INVENTOR ADOLF N. R

ATTORNEY.

Patented June 5, 1934 UNITED STATES PArENr FFICE 1 Claim.

This invention relates to gas burners and more particularly to Bunsen burners for consuming natural gas.

The principal object of the invention is to adapt Bunsen burners to efficiently burn. natural gas.

Another object is to increase the ratio of air aspirated into the burner to improve the combustibility of the gas mixture.

Another object is to raise the thermal efficiency of the burner.

Another object is to prevent carbonization of the gas flame, as in prior natural gas Bunsen burners, wherein incomplete combustion of the gas produces incandescent carbon particles resulting in an objectionable yellow flame.

Another object is to insure against the creation of unpleasant odors incidental to the operation of the burner.

A further object is to decrease the cost of production of Bunsen burners.

Other objects and advantages appear as the description progresses.

Natural gas has proved to be particularly disadvantageous for use in the conventional Bunsen burner. The gas appears to lack physical afiinity for the atmosphere and forms an imperfect admixture with it. This gas also requires a large volume of air to be mixed therewith to properly support combustion.

In the usual Bunsen burner, these factors result in incomplete and uneven combustion and carbonization of the flame. It has been found Impossible to admit sufficient air into the burner by adjustment of the usual aspirator as the additional air does not properly mix with the gas and produces a roaring flame.

Broadly stated, the invention consists of providing a Bunsen burner with a plurality of independent aspirators to progressively increase the ratio of air mixed with the natural gas. This also retards the progress of the current of gas through the burner thus permitting the gas sufficient time to completely mix with the air before passing into the flame.

In this specification and the accompanying drawing the invention is disclosed in its preferred form. It is to be understood, however, that it is not limited to this form because it may be embodied in other forms within the purview of the claim following the description.

In the accompanying one sheet of drawings:

Fig. 1 is a side elevation of a Bunsen burner constructed in accordance with this invention.

Fig. 2 is a vertical section of the same.

In detail, the construction illustrated in the drawing comprises the base 1, having the nipple 2 projecting laterally therefrom and adapted to be telescoped within the usual gas supply tube. The gas inlet 3 extends through the nipple 2 and intersects the vertical passage 4 located axially of the base.

The upper portion of the passage 4 is internally threaded to engage the threaded end 5 of the aspirator 6. The end of the aspirator has a tapered opening therethrough into which is driven the nozzle 7 having the restricted orilies 8.

The aspirator includes the lower and upper heads 5 and 9, respectively, joined by the integral shrouds 10. The shrouds should be relatively narrow in width to provide the maximum space for the entrance of air into the aspirator.

The tubular stem 11 is adjustably threaded in the upper head 9 above the orifice 8 and is maintained in adjusted position by the knurled locking nut 12. A second aspirator 13, similar to the aspirator 6, includes a head 13 screwed onto the upper end of the stem 11. The end of the stem preferably projects above the head 13 as shown at 14 for reasons hereinafter more fully explained. The stem 11 discharges into the relatively large body of the burner tube 15 which is fixed in the upper head 13" of the aspirator 13 and extends upwardly therefrom.

The flaring hood 16 has the inturned flange 17 resting on the top of the upper head 13 and depends downwardly therefrom to encircle the aspirator 13. The hood prevents raw gas fumes from escaping upward from the aspirators 6 and 13.

The burner operates substantially as follows: Natural gas is supplied from any service line through the usual rubber tube, not shown, and enters the burner through the inlet 3. A small volume of gas forcibly issues through the orifice 8 and is discharged into the larger space within the tubular stem 11. This draws air from the atmosphere surrounding the aspirator, into the interior of the stem. The exact proportion of air admitted through the aspirator 6 can be regulated to meet conditions by adjusting the stem 11 at 9.

As the gas and air rise within the stem, they become more or less mixed and blended as in the conventional Bunsen burner. Under the present invention, the mixture of gas and air is discharged from the upper end of the stem 11 and is infused with additional air in the aspirator 13 as it passes into the relatively large interior of the burner tube 15.

The upward draft of air created within the hood 16 by the operation of the aspirator, draws any incidental eddies of gas within the aspirator 13 into the burner tube. The hood also serves to prevent the gas passing through the aspirator 13 from being diverted by side drafts. The projection of the end of the tubular stem at 14 assists the hood in preventing escaping eddies of gas within the aspirator.

The second aspiration of air at 13 retards the progress of the current of gas through the burner, thus allowing time for it to become thoroughly mixed and infused with air in the burner tube before passing into the flame at the upper end of the burner tube. The mixture of gas and air issuing from the end of the burner tube diffuses slowly, thus permitting the gas to be completely consumed in the flame.

The relatively large volume of air mixed with the gas at 6 and 13 permits complete oxidization of the hydrocarbon constituents of the natural gas, thus insuring against the forma tion of free carbon particles producing a yellow flame.

Having thus described the invention, what is claimed and desired to be secured by Letters Patent is:

A Bunsen burner having a base with a gas inlet; an aspirator including an orifice discharging thereinto and communicating with said inlet and a stem above said orifice and longitudinally movable with respect thereto; and a second aspirator including the upper end of said stem discharging thereinto and a burner tube above said stem and longitudinally movable with respect thereto.

ADOLF N. ROTH.

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