US1596187A - Burner for blowtorches, fire pots, and the like - Google Patents

Description

Aug.17,1926.' 1,596,187

L. S. lJQHNSON y BURNER FOR BLOWTOR-GHES, FIRE IAOTS', AND THE LIKE Filed August 12, 19125 j L O .5. JOH/V50N.

. ATTORNEY Patented Aug, 17 1926.

UNITED stares PATENT orties., L

BURNER FOR BLOVJTORGHES, FIR-E POTS, AND THE LIKE.

Application mea August 12, 1925. semi Nb. 49,701.

This invention relates to burners'for blow torches, fire pots and the like.

One object of the invention is to provide a burner of this kind which will produce an i intensely hot blue ame.

A further object of the invention is to provide such a burner in which the flow of fuel to the burner will be uniform and the llame steady.

A further object of the invention is to provide a burner of this character which will be simple in its'construction and inexpensive to produce'l Other objects of the invention will appear as the device is described in detail. l

In the accompanying drawings Fig. 1 is a side elevation of a burner embodying'iny invention, showing a portion of the fuel tank in section; Fig. 2 is a longitudinal sectional View taken centrally of the burner; Fig. 3 yis a transverse section taken on the line 3-3 of Fig. 2; Fig. 4 is a transverse section taken on the line l-4 of Fig. 2; and Fig. r5 is a front elevation of the burner.

In these drawings I have illustrated one embodiment of my invention but it willbe understood that this hasbeen chosen for the purpose of illustration only and'that the burner may take various forms without departing from the spirit of the invention.

As here illustrated the burnerV comprises an elongated body portion or flame tube1 which is provided in its rearwall with an Ainlet port 2 which is controlled'by a needle valve 3 screw threaded into a boss 4 formed on the rear end wall of the'burner. ln the present arrangement the burner is'supported on the fuel tank 5 by means of a tubula'rsup porting member or pipe .6 which forms a part of the supply pipe and the lower end of which communicates with a tube 7 which extends downwardly into the fuel tank, preferably to a point near the bottom thereof, the tube 7 and pine 6 being preferably filled with wicking, as shown at 8. rlhe tank 5 is provided with the usual air pump 9, by means of which air may be pumped into the tank to subject the liquid fuel therein to air pressure which will force it from the tank into the burner. The upper end of the supply pine 6 communicates with one end of the fuel conduit which leads therefrom to the intake port 2 and ,is so arranged that it will be subjected to the heat of the flamek in the llame tube. As here shown, the conduit is formed integral with the flame tube and comprises a portion 10, communicating with the upper end of the pipe 6 and extending through the flame tube transversely to its length, the conduit being of an exterior diameter less than the internal diameter of the flame tube so asto provide relatively large passageways for the flame on both sides .of the conduit. A second portion of the conduit is formed in the top wall of the flame tube, as shown at 11,`and extends rearwardly from the portion 10 ofthe conduit to the rear wall of ther flame tube where it is connected with a vertical portion 12 of the conduit which is formed' in the rear wall and leads to the inlet uort 2, the top and rear walls of the fla-me tube being thickened to provide space for the conduits.`A The bore in the rear wall of the llame tube, the upper portion of whichconstitutes a Dart ofthe fuel conduit, extends downwardly beyond the inlet port and, lin the present instance, into avboss 13 which depends fromv the flame tube beneath the inlet port; The lower end of the bore is closed, inthe present device by a screw 14, and thus constitutes a reservoir or equalizing chamber 21 which is in -open communication' with the'fuel conduit and when thevalve 3 is :in its open position neath therear portion ofthe burner and, in

the 'present -instance, mounted onwthe supply pipe 6, isa generating cup 15 adapted to receive al quantity of fuel rwhich when Yignited will heat the burner and vaporizeV The n the fuel in the reservoir and conduit.

LLOYD s. JOHNSON, oFnAYToN, onto, assiettes roiroaaon ivi. HUFFMAN, or t DAYTON, onto. y

is in communication with the inlet port.

flame tube is provided Iin the rear portion provided with rests or supports 19 and 2O by means of which a soldering` irony or other implement may be supported on the tube with its end adjacent to the flame which is projected from the tip 18 thereof.

The burner is started in operation by pumping air into the tank 5 to place the fuel under air pressure and then opening the valve 3 to permit a portion of the fuel to pass through the inlet port and the openings in the flame t-ube into the generating cup l5. This fuel is then ignited and the flame therefrom will heat the reservoir 13 andthe rear end of the flame tube and thus cause the fuel in the reservoir and fuel conduit. to be vaporized. The valve 3 is preferably closed or partly closed during this initial vaporization and when the burner has been heated to the desired extent the valve is opened to permit the vapor, which is under high pressure, to escape through the inlet port into the flame tube where it is ignited by the flame in the generating cup and where it mixes with the air and'burns with a blue flame of intense heat. The arrangement of the fuel conduit with relation to the ame tube is such that it is subjected to an intense heat which quickly converts the fuel into vapor under high pressure. This intensely hot and completely vaporized fuel burns with a clear blue flame having an intense heat, which is the ideal sought for in burners of this type, but. it has been found that the pressure iluctuates so that the fuel is not fed uniformly to the llame tube, thus causing a flickering or spitting of the flame. This objectionable feature is overcome by providing the reservoir or equalizing` chamber 21. When the pressure in the fuel conduit exceeds normal pressure the excess fuel will be forced into the equalizing chamber and confined under pressure and, when the pressure in the fuel conduit drops, this fuel will. escape. to the inlet port 2, thus providing additional fuel and boosting the flame. In this manner the fluctuations in pressure are avoided and a uniform flow of fuel is provided which results in a steady flame. Another result produced by this construction of the burner is the constant flow of fuel from the tank 5 to the burner. After the fuel in the tank has been initially subjected to air pressure a constant flow of fuel will be maintained to the burner until the tank is exhausted without. the necessity of repeatedly pumping air into the tank, as is usually necessary.

While I have shown and described one embodiment of my invention I wish it to be understood that I do not desire to be limited to the details thereof as Vvarious modifications may occur to a person skilled in the art.

Havingv now fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A burner of the character described, comprising a flame tube having-a valve controlled inlet port at its rear end, aV fuel conduit formed integral with said tube, extending transversely through the same, extending rearwardly through the upper wall thereof and downwardly `through the rear wall thereof to said inlet port, and an equalizing' chamber formed in the rear wall thereof and communicating with said con- 2. A burner of the character described, comprising a flame tube having an inlet port in its rear end wall and having` a boss depending; therefrom beneath said inlet port, a fuel conduit formed integral with said flame tube, extending upwardly thrcirghV the same, rearwardly along the top wall thereof and thence downwardly through the rear wall of said tube into said boss, the lower end of said conduit being` closed to form a reservoir beneath said inlet port, a needle valve extending` through the last mentioned portion of said fuel conduit and adapted to control said inlet port, that portion of said valve which extends throughl said conduitV being of less diameter than said conduit to provide open communication between said conduit and said reservoir. f

In testimony whereof, I affix my signature hereto.

LLOYD S. JGHNSON.

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