US3058515A - Gas burner - Google Patents

Description

Get. 16, 1962 E. H. REV'IN ETAL GAS BURNER Filed April 9, 1959' v INVENTORS Edward H. Rem BY derrm T. Alc er 3,058,515 GAS BR Edward H. Rein, Elgiu, and Jerry T. Alger, Chicago, 111., assignors, by mesne assignments, to Configured Tube Products Co., St. Louis, Mo., a corporation of Missouri Filed Apr. 9, 1959, Ser. No. 805,333 2 Claims. (Cl. 15899) This invention relates to a new and improved burner for gas or other suitable fuel.

One object of the present invention is to provide a new and improved gas burner which is surprisingly simple and inexpensive to manufacture, yet will burn in a stable manner, without any substantial tendency to flash back or blow out.

Another object is to provide a new and improved gas burner of the single port type, adapted to operate in -a quiet, efiicient manner.

Further objects and advantages of the present invention will appear from the following description, taken with the accompanying drawings, in which:

FIG. 1 is an elevational view of a burner to be described as an illustrative embodiment of the present invention.

FIG. 2 is a fragmentary enlarged top view of the burner shown in FIG. 1.

FIG. 3 is a fragmentary vertical section, taken generally along a line 3--3 in FIG. 2.

It will be seen that the drawings illustrate a burner 10, adapted to operate on gas or other suitable fuel, supplied by a pipe 12. The illustrated burner comprises a mixing tube 14, which may be either curved or straight, the illustrated tube being curved or bent through an angle of approximately 90.

The burner tube 14 has an inlet or entrance portion 16 into which the gas is introduced by a nozzle 18. As shown, the entrance portion 16 takes the form of a generally cylindrical housing. The nozzle 18 extends axially into the right-hand end of the housing 16. Thus the gas is directed axially into the tube 14. From the housing 16, the gas travels into a constricted venturi throat portion 20 of the tube 14. Beyond the throat 20, the tube has a flaring portion 22 which increases in diameter to the full diameter of the tube 14-.

The injection of the gas into the venturi throat 20 induces a flow of air into the housing 16 through openings or ports 24 formed therein. The flow of air may be regulated by means of a rotatable cup-shaped air shutter 26, having openings 28 therein, adapted to be moved into and out of registration with the openings 24. The shutter 26 may be locked in its adjusted position by a clamping screw 30, which is threaded into the housing 16 and extends through a slot 31 formed in the shutter. The nozzle 18 extends into the housing 16 through an opening in the end of the shutter 26.

Near its discharge end, the tube 14 has a substantially cylindrical portion 32. The extreme end of the discharge portion 32 is turned inwardly to form an annular flange 34, which extends around and defines a single discharge port 36, through which the mixture of fuel and air is discharged. An outwardly flaring portion 38 is interposed between the tube 32 and the flange 34. Between the flaring portion 38 and the flange 34 there is a semicircular bend 40 which has a cross section somewhat similar in shape to that of a horseshoe. It will be apparent that the portion 38 flares out to a diameter somewhat greater than that of the cylindrical portion 32.

As shown, the inturned flange 34 slants into the end of the tube 32, both radially and longitudinally. Thus, as shown in FIG. 3, the flange 34 is substantially frustoconical in cross section. It will be apparent that the 3,058,5i5 Patented Oct. 16, 1962 inc flange 34 slopes downwardly and inwardly, into the tube 32. The discharge port 36 is substantially smaller in diameter than the inside diameter of the tube 32.

It will be understood that the mixture of fuel and air, discharged from the port 36, maintains a flame 42 having its base adjacent the flange 34. It has been found that the flange 34 is eflective to stabilize the flame so that it operates in a quiet, eflicient manner. If the flange 34 is not provided, the flame will tend to flash back into the burner tube, particularly when the gas pressure is low, or when the burner is used with gas having a relatively high rate of flame propagation. When the gas pressure is high, the flame will tend to be blown off the end of the burner tube. The provision of the flange 34 substantially eliminates these tendencies, so that the flame will neither flash back nor blow out. Moreover, it will operate quietly, without the tearing or roaring noise which is associated with unstable flame operation.

The outwardly flaring portion 38 has the eflect of deflecting secondary air outwardly, away from the base of the flame, as the air travels upwardly along the outside of the tube 32. This action contributes to the stability and silent operation of the burner. The movement of the secondary air is indicated by arrows 44 in FIG. 3.

The burner of FIGS. 1-3 will operate in an extremely quiet, eflicient and stable manner without any flame spreader or other similar attachment. This is one of the important advantages of the burner, because the elimination of any need for a flame spreader makes the burner inexpensive.

It will be apparent that the gas burner of the present invention is remarkably simple in construction and easy to manufacture. Nevertheless, it will produce a flame that spreads in a very eflicient, quiet and stable manner.

Various modifications, alternative constructions and equivalents may be employed without departing from the true spirit and scope of the invention, as exemplified in the foregoing description and defined in the following claims.

We claim:

1. In a gas burner, the combination comprising a thin walled metal burner tube of circular cross section, said tube having an imperforate tubular body with an inlet end and a discharge end, said tube having air openings therein adjacent said inlet end, a gas nozzle for directing a stream of gas into said inlet end and toward said discharge end, said stream of gas inducing flow of air into said tube so that a mixture of gas and air passes along said tube to said discharge end, said discharge end of said tube being formed with a solid imperforate inturned annular flange extending around a single circular discharge port of a diameter substantially less than the inside diameter of said tube, said tube being imperforate between said air openings and said inturned annular flange, said flange being generally frusto-conical in shape and being inclined into said tube both radially and longitudinally, said flange having substantially parallel surfaces on both sides thereof, both of said surfaces being inclined into said tube both radially and longitudinally, said flange being effective to stabilize the flame of said burner against flashing back and blowing out, and an outwardly flared solid imperforate annular portion on the discharge end of said tube and disposed between the body of said tube and said flange for deflecting secondary air outwardly away from the base of the flame so as to provide a further stabilizing action, said flared annular portion and said annular flange being of generally equal length, the length of said flange being minor relative to the length of said body, the inside of said body being open and clear to provide for substantially free uninterrupted flow of the mixture through said body to said port.

2. -In a gas burner, the combination comprising an imperforate thin walled metal burner tube having an inlet end and a discharge end portion, means for introducing a mixture of gaseous fuel and air into said inlet end to maintain a flame at said discharge end portion, said means comprising a gas jet for directing a stream of gas into said inlet end of said tube, said inlet end having openings therein for admitting air to mix with said gas, an outwardly flaring solid imperforate portion extending from the discharge end portion of said tube, and an annuiar solid imperforate flange turned inwardly from said outwardly flaring portion and slanting into said tube both radially and longitudinally to stabilize the flame against flashing back and blowing out, said flange having substantially parallel surfaces on both sides thereof, both of said surfaces slanting into said tube both radially and longitudinally, said flange extending around and defining a discharge port substantially smaller in diameter than the in side diameter of said tube, said tube being imperforate between said openings and said annular flange, said out- 4 wardly flaring portion and said annular flange being of generally equal length, the length of said flaring portion being minor relative to the length of said body, the inside of said tube being substantially open and clear to provide for substantially free unobstructed flow of the mixture through said tube to said port.

References Cited in the file of this patent UNITED STATES PATENTS 508,312 Heister Nov. 7, 1893 576,282 Smith Feb. 2, 1897 1,280,214 Hansen Oct. 1, 1918 1,434,256 Thompson Oct. 31, 1922 1,800,617 Forster Apr. 14, 1931 1,809,113 Forster June 9, 1931 1,857,862 Page May 10, 1932 2,261,270 Mueller Nov. 4, 1941 2,475,240 Hassmer et a1 July 5, 1949

Images