US2336332A - Starter burner - Google Patents

Description

Dec. 7, 1943. J YEAGER 2,336,332

STARTER BURNER Filed March 19, 1941 Patented Dec. 7, 1943 STARTER BURNER Anton J. Yeager, Wisconsin Rapids, Wis., asslgnor to Prentiss Wabers Products 00., Wisconsin Rapids, Wis., a corporation of Wisconsin Application March 19, 1941, Serial No. 384,039

2 Claims.

erating on relatively volatile fuels, such as gasoline or kerosene, the fuel is gasifled by heat and burned as gas. During operation of the burner, the liquid fuel is gasified by passing through a generating tube located in heating proximity to the burner flame. In multiple burner stoves, one master burner may supply heat to gasify the fuel for all the burners. In starting up the burner, however, it is necessary to provide means for heating the generating tube to gasify the fuel. Various means have been provided for this purpose, including shallow pans or cups built into the structure to be filled with liquid fuel and lighted to give a flame heating the burner. Other means have been developed, such as starter burners intended to operate on the air under pressure in the upper part of the tank, this air being presumed to contain inflammable vapor from the fuel. These burners are not certain in their operation, since the vapor content of the air is dependent upon the temperature of the fuel and its relative volatility, With fuel of low volatility these burners are ineflective except when the ambient temperature is high.

It is an object of the present invention to provide a new and improved starter burner for burners using light liquid hydrocarbons.

It is a further object to provide a burner of this character which may be instantly lighted with a match or similar small flame.

It is an additional object to provide a construction adapted to effectively atomize and vaporize the liquid fuel by an admixture of air under pressure from the fuel tank.

It is also an object to provide a starter burner construction which is simple in design and use and in which danger of clogging of the orifices is minimized.

Other and further objects will appear as the description proceeds.

I have shown a preferred embodiment of my invention in the accompanying drawing, in which- Figure 1 is an elevation of a blow torch with my starter burner applied thereto, the blow torch being broken away to show the burner, and the burner being shown in cross-section; and

Figure 2 is a fragmentary cross-section on an enlarged scale showing the construction of the starter burner.

In the drawing, referring first to Figure 1, the blow torch comprises the tank II, with the handle l2, and the fuel pipe |3 leading to generator pipe II, which in turn leads to the generator valve IS. The generator valve is of the usual construction, controlled by hand wheel l6 and discharging the flame into the flame directing hood H. The blow torch is provided with an air pump I8 operated by plunger knob l9, so that the fuel in the tank H is placed under pressure.

The starter burner comprises the body member 2|, into the lower end of which is threaded the vapor tube nipple 22 carrying the upper end of the fuel tube 23. The valve stem nipple 24 is secured in the side of the upper portion of the body 2| by brazing or soldering, as indicated at 25, so as to make a permanent and gas-tight joint. The starter body 2| is provided with a central bore 26, which meets a cone-shaped cavity 21 in the lower portion of the body. The upper end of the central bore 26 discharges through a conical end 28 formed on the body. The starter tip member 29 is threaded on the upper part of the body 2|, fitting against the cone 28, and is provided with a reduced metering orifice 30 in alignment with the bore 26 in the body. The tip member 29 carries the shield 3| to direct the flame from the starter burner, this shield being provided with air openings 32 as indicated in Figure l. The body 2| is provided with a conical valve seat 33 which intersects the bore 25 and is adapted to receive the conical end 34 of the valve stem 35, which is threaded into the valve stem nipple 24. This valve stem 35 carries the knob 36 for manual operation. As shown in Figure 1, the nipple 24 carries the gland 31 and packing 38 to prevent gas leakage around the valve stem 35.

The fuel tube nipple 22 is provided with a central bore having a reduced threaded portion at 39, into which the upper end of the fuel tube 23 is threaded. The fuel tube 23 is smaller than the main portion of the bore and the nipple 22, to provide a circumferentially extending passage 40 in communication with the upper portion of the fuel tank. The upper portion of the nipple 22 is conical in shape, as shown at 4|, and provides a chamber 42 in communication with the passage 43 in the interior of the fuel tube 23. The conical end 4| is provided with a small central bore through which fuel is directed into the bore 26 in the body member 2|. The nipple 22 be understood that the fuel tank is partially filled with liquid fuel, with air under pressure.

assess:

connection with a blow torch, it is obviously capable of use in other connections with heaters, stoves or burners of various types. The starter burner may be used with kerosene, gasoline or other similar volatile fuels. The burner structure is capableof modification to meet differing conditions and requirements, and I contemplate such variations as come within the spirit and scope of the appended claims.

What is claimed is: 1. A burner adapted for use in a vessel containing liquid fuel and air under pressure comprisabove the liquid fuel. The valve knob 36 is rotated to unseat the conical valve member 24,

which permits communication between the fuel tube 23 and the upper portion of the, bore 26 in the body 2|. When this valve is unseated, liquid fuel flows up through the passage 43 in the fuel tube 23 and through the orifice .in the pointed end 4| of nipple 22. This fuel is forced out by air pressure in the tank. At the same time this air under pressure in the tank moves up through the passage 40 through the orifices 44 and through the conical chamber 21 to meet the jet of liquid fuel at the pointed end of the nipple portion 4|. This provides, therefore, a conical sheet of air under pressure meeting a small jet of liquid fuel. The air vaporizes the fuel, and the mixture of air and finely divided and vaporized fuel passes up through bore 26 and out through the metering opening 30 in the starter tip member 29. This fuel and air mixture may be ignited by inserting a match through one of the openings 82 in the shield 3|. This mixture of atomized and vaporized fuel and of air under pressure produces a hot flame which quickly heats up the generator tube H. After this tube has had an opportunity to be heated up, the main generator valve I is opened by turning the handle l6, and liquid fuel flowing through the valve I5 is vaporized. As soon as the main burner is started, the starter burner is turned off by rotating the valve knob 38. The heat of the main flame during continued operation serves to heat the generator tube l4 and vaporize the fuel as it passes through that tube. The various orifices provided are relatively large for handling such fuel and air and minimize any tendency of clogging. The metering orifice is in the separate tip member 29 which may be readily removed for cleaning or replacement.

While this starter burner has been shown in ing, in combination, a burner body having a central bore therethrough, a vapor tube nipple threaded into said burner body, said nipple having a discharge outlet communicating with said bore, said burner body and said nipple providing an annular passageway therebetween, said nipple also having a bore, a fuel tube located in said bore and threaded into said nipple, said bore providing an annular passageway for air between said fuel tube and said nipple, said nipple having radially directed apertures providing communication between said passageways for directing air under pressure at right angles to said first men- .tioned annular'passageway, the region of said nipple adjacent to its discharge outlet forming with said burner body an annular conical passageway adapted to deliver air from said first mentioned annular passageway into proximity with fuel discharged through said discharge out- 2. A burner adapted for use in a vessel containing liquid fuel and air under pressure comprising, in combination, a burner body, a nipple threaded therein, a fuel tube threaded into said nipple, said nipple and said fuel tube providing between them an annular passageway extending throughout a portion of said nipple, said burner body and said nipple providing between them an annular passageway extending throughout another portion of said nipple, said nipple having radially directed passageways connecting said annular passageways for directing air unde1 pressure at right angles to said first mentionec annular passageway,. said annular passagewa: between said burner body and said nipple havim at its discharge extremity a conical conformatior disposed in position to deliver air coaxially with reference to the discharge of fuel through saic' fuel tube and nipple.

ANTON J. YEAGER.

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