US2867272A - Gas burner - Google Patents

Description

Jan. 6, 1959 H. E. MORRISON GAS BURNER Filed May 19, 1954 1 EVE .2: far Hzzom. 4. Mom/so "in i V {9 i l.

2 -Claims. (Cl. 158-113) This invention relates to improvements in gas burners and more'p'articularly relates to a simplified form of gas burner adapted for use in gas heated clothes dryers and the'like, although not limited to such uses.

A principal object of my invention is to provide a simple and improved form of gas burner so constructed and arranged as to increase the efliciency of combustion and to reduce the likelihood of the flame going out upon sudden surges in pressure.

Still another object of my invention is to provide a simple and lighter gas burner, formed from an open ended tube having an inlet at one end of the tube and 'an outlet at the oppsite end of the tube in the form of a uniformly curving inwardly extending wall portion forming a discharge orifice for the tube, and having flame-deflecting means extending over the discharge orifice, and forming a flame pocket to reignite the burner in case the flame should be blown out by sudden surges inpressure cooperating with the burner orifice "to effect complete mixture of the gas with 'air withthe resultant complete combustion thereof.

These and other objects of my invention will appear from time to time as the following specification proceeds andwith reference to accompanying drawings wherein:

Figure 1 is a plan view of a gas burner constructed in accordance with my invention and shown as being connected in a gas supply system, such as iscommonly used in gas heated clothes dryers.

Figure 2 is an enlarged plan view of the gas burner shown in Figure 1;

Figure 3 is a view in side elevation of the gas burner;

Figure 4 is an enlarged fragmentary sectional view of the gas burner taken substantially along lines IV-IV of Figure 2;

Figure 5 is a fragmentary view showing a modified form in which my invention 'may be embodied; and

Figure 6 is a view of the venturi and air'valveiused in the form of my invention illustrated in Figure 5.

In Figure 1 of the drawings, 1 have shown a'gas burner 10 connected to a gas supply line 11 by a coupling 12. The gas supply line is shown as having a pressure regulator valve 13 therein, to assure a'uniformpressure of gas regardless of variations in pressure of'the' gas at the source. A main gas supply valve '14 and a main burner valve are also shown as being connected in the gas supply line 11. The gas supply valve 14 and main burner valve 15 may be solenoid operated, and are of a conventional form so need not herein be shown or described further.

A pilot burner 16 is shown as being connected to a bracket or mounting 17, projecting outwardly from a collar 18. The collar 18 encircles a cylindrical body portion 19 of the burner 10 and may be welded or otherwise secured thereto. The bracket 17 also has a depend ing bracket portion 2i forming a mounting for the burner. The pilot burner 16 is of a well known form and is connected with the gassupply-line 11 through the gas supply valve 3.4 and may be supplied with gas whenever herein shown or described further.

be blown out by sudden surges in pressure.

2,367,272 Patented Jan. 6, 1959 the gas supply valve '14 is open and the control system for the valves 14 and 15 is electrically energized. A pilot line 21 is shown as forming a source of supply of gas to the pilot burner 16. Adjacent thepilot burner .is an igniter ZZwhichmay be electrically energized under the control :of the electrical control system and preferably is in the form'of a glow coil of a well-known form, so not A control means is also provided for the gas supply valve '14 which may be in theformiof 'airnercury' bulb or any other suitable thermostatic element (not shown) for efiecting' the 'de-energization of the solenoid for the valve 14, in case the pilot should fail to ignite. Said control means is no part of my present invention, so need not herein be described further.

The gasburner 10 is shown as being in the form of a tube open at its opposite ends .and having a generally cylindrical wall 23 at the inlet end thereof, relatively short compared to Tthe wall 19. The wall 23 has a plurality of ports "24 leading :therethrough andv affording a source of air for'mixture with the gas entering the'inlet end of the valve. I

Surrounding the cylindrical wall 23 for a portion of the periphery thereof,'and1mounted thereon for slidable movement thereabout is an air valve 25. The air valve 25, as herein shown, has spaced wall portions 27 :and -29 movablealong the wall 23 tozrestrict the size of the ports 24 and control thevo-lume of .air admitted therethrough, as is usual with-such burners. The wall portion 27 is shown as being slotted to receive a screw 39 which may be threadedin the wall 23 of the gas burner 10, to :hold the valve 25 in 'position. The valve '25 also :extends across the end of the gas burner and forms a fitting through which the .gas supply coupling .12 may extend for supplying'gas tothe inlet'end of the burner '10.

Inwardly of the cylindrical 'wall portion 23 of 'the burner 10, is an inwardly curved wall portion 31 curving inwardly to a restricted throat 32 and thence t gradually flaring outwardly to thecylindrical wall portion .19 of the gas burner, and forming inefiect, a venturi.

The wall-portion 19 ofthe gas'burn'erlhas an inwardly contoured end 35, uniformly curving to :form a discharge o-r*burner orifice 36. The contour of 'thewall l9 at'the discharge end of the burne'r is such as to deflect the gas and airsinwardlyto create'ed'dy currents in the mixtureof gas and airspassing through theorifice-andeffect a more complete mixture of the gas'and air. The inwardly curved burner orifice 36 also cooperates with a hollow hemispherical flame pocket and deflector '37. Said flame pocket and deflectortextends over and forwardly of the burner orifice 36 and extends downwardly to a level substantially midway of each side of the tube'and thereby surroundsabout one half the circumference of the burner orifice and forms a shielded flame pocket over the orifice, maintaining a flame to reignite the gas in cases where the flame may The flame pocket and deflector 37"als0 arrests forward travel of the gas and air and deflects the gas and air downwardly, uniformly spreading the flame-and'thus'affectingathoroughrnixing of the gas with the air 'as it'leaves'the dis charge orifice 36,-and increases theefliciencyof combustion.

As herein shown, the hemispherical flame pocket and positioned at substantially the center of the gas flame which may be seamless tubing, and maybe spun to form the venturi adjacent the inlet end of the burner and form the wall defining the burner orifice to the desired form. It is, of course, obvious,v that the tube need not be spun, but may be rolled or formed inany other manner desired, and may even be formed from a metallic sheet suitably formed to the desired form. It should further be understood that the metal used for the burner need notbe steel but may be of various other suitable metals.

The collar 18, bracket 17 and flame deflector 37 may also be made from sheet metal, such as steel or any other suitable metal. The entire burner may then beenameled if desired to increase the resistance of the metal to the corrosive action of the gases.

In the embodiment of my invention illustrated in Figures and 6 ofthe drawings, I have shown a burner like that shown on Figures 1 through 4, but have shown the body of the burner in the form of a straight tube 40, with a venturi insert and air valve 41 in the inlet end thereof.

In this form of my invention the cross-sectional area of the throat of the venturi may be varied for various types of gases to be burned, by changing the venturi inserts as required.

The tube 40 is shown as having the venturi insert 41 inserted in its inlet end for axial adjustment with respect thereto to vary the mixture of the air and gas to be used. As herein shown, the tube 40 has two diametrically opposed ports 42 leading therethrough for supplying air through port 43 in a wall 44 of the insert 41. The tube 40 also has a slot 45 extending circumferentially along its wall for a portion of the periphery thereof, through which extends a machine screw 46 for 4 interior of said flame deflector to protect the flame and further assure complete mixing of the gas and air and increase the efliciency of combustion thereof.

It may alsobe seen that the gas burner of my invention may be made from a simple tube having interchangeable venturi inserts at the inlet end thereof, and thus enabling the burner to readily be accommodated to various types of gas.

It may also be seen that the gas burner of my invention is of a far simpler construction than the gas burners theretofo-re used and avoids the use of the more or less heavy, difficult to cast, cast-iron parts heretofore used, and instead forms the burner from a simple formed metal tubing, all of the parts of which may be formed from sheet steel and may be secured together by inexpensive welding operations.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

I claim as my invention:

1. A gas burner comprising a horizontally extending metal tube having an inlet at one end thereof, a cylindrical wall portion at the inlet end thereof converging to a reduced diameter throat of a venturi and diverging from said throat to a generally cylindrical wall portion contoured adjacent the outer end thereof in the form of a uniform inwardly turned wall terminating in a burner orifice, and a downwardly opening hollow hemispherical flame deflector mounted on said'tube rearwardly of said burner orifice and extending over said burner orifice and downwardly to a level substantially midway of each side of the tube and thereby surrounding aboutone half the circumference of the burner orifice, and cooperating therewith to effect a shielded flame pocket and to arrest holding the venturi insert 41 in position, when the air ports 42 and 43 are in proper adjustment with respect to each other.

The insert 41 has a flanged outer end portion 47, abutting the end wall of the tube 40, which has an annular fitting member 48 welded or otherwise secured to the outer face thereof. The fitting member 48 is shown as having a central passageway 49, extending within the flange 47 and forming a means for connecting the fitting 12 thereto.

The insert 41 also has a converging wall portion 50, converging to a discharge orifice 51 formingthe throat of a venturi, inwardly of the inlet of the tube 40.

.The outlet from the tube 40, like the tubular wall 19 of the burner 10, has a uniformly curved converging outlet 53 cooperating with a downwardly opening hemispherical flame pocket and deflector 54 to reduce blowing out of the flame by sudden surges in pressure and to assure a complete mixture and combustion of the air and gas, .with a minimum amount of carbon monoxide in the products of combustion.

It .may be seen from the foregoing that 1 have provided an extremely simple and eflicient form of gas burner made from metal tubing and spun or otherwise formed to the desired shape, and having an inwardly turned discharge end forming a discharge orifice for the burner and so contoured as to efliciently mix the gas with the air mixing with the gas through the valve 24 and thus increasing the efliciency of combustion of the gas.

It maystill further be seen that the inwardly turned discharge end of the burner .is partially enclosed by the flame deflector. 37 and cooperates with the hemispherical forward travel of the flame and deflect'and uniformly spread the flame. 1

2. A gasburner comprising a horizontally extending sheet metal tube having an inlet through one end thereof and a discharg'e'outlet through the opposite end thereof and having an apertured-wall portion adjacent said inlet for the admission of air thereto, and also having venturi means in association with said inlet on the downstream side of said apertured wall portion, said tube also hav- 3 ing a valve member rotatably mounted around said apertured wall portion adjacent said inlet for association with the aperturesleading through said wall portion, to vary the inlet area thereof and the quantity of air supplied for mixture with the gas, and having an inwardly contoured discharge end uniformly curving to form a burner orifice and beyond the end thereof and downwardly therealong to a level substantially midway of each side orifice and directing the gases toward the center of said burner, to create eddy currents therein and eflect a thorough mixture of the gas with air, and a downwardly opening hollow hemispherical flame pocket and deflector secured to said tube rearwardly of the inwardly contoured discharge end thereof and extending above said burner of the tube and thereby surrounding about one half the circumference of the burner orifice and cooperating with said tube and orifice to form a flame pocket shielded from sudden increases in pressure of the gas and air and to arrest the forward travel of the gas and uniformly deflect the gas in a. downward direction.

References Cited in the file of this patent UNITED STATES PATENTS 1,158,652 Doyle Nov. 2, 1915 1,192,550 Needham July 25, 1916 1,320,108 Werlin Oct. 28, 1919 1,364,094 Fisher Jan. 4, 1921 1,707,451 Thomas Apr. 2, 1929 2,149,182 Powers Feb. 28, 1939 2,485,058 McKee Oct. 18, 1949 2,731,009 Pocrass et al. Jan. 17, 1956

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