JPH0223941Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] This invention is a vaporizer tube type in which fuel is vaporized using a vaporizer tube, and this vaporized gas is ejected from a nozzle to form an air-fuel mixture in a burner and burn it. This invention relates to a liquid fuel combustion device.

[Conventional technology]

A vaporizer tube type liquid fuel combustion device is equipped with a vaporizer tube equipped with a sheathed heater as an electric heater.
The vaporized gas vaporized in this vaporization tube is ejected from the injection nozzle into the interior of the burner to form an air-fuel mixture and combust it. Because of its high combustion efficiency, it is used as a heat source for various devices. There is.

FIG. 3 is a cross-sectional view of a main part showing an example of a liquid fuel combustion apparatus using a vaporizing tube type which has been generally used in the past.

In the figure, reference numeral 1 denotes a vaporization tube, and a vaporization stabilizing member 1b made of a metal mesh or the like is installed inside an outer cylinder 1a made of heat-resistant stainless steel or the like in a cylindrical shape to increase heating efficiency. The sheathed heater 1c passes through it.

Both ends of the outer cylinder 1a are welded to the sheathed heater 1c, thereby forming a vaporization chamber therebetween, and a jet nozzle 2 is brazed to the outer periphery of one end of the outer cylinder 1a.

A thermistor 3 detects the temperature of the vaporizing tube 1 by being fixed to the circumferential surface of the outer cylinder 1a.

4 is a valve rod for opening and closing the jet nozzle 2;
It is actuated by an electromagnetic solenoid 5. A fuel pipe 6 is connected to the discharge side of the pump 7 to supply fuel, and its end is joined to the outer cylinder 1a on the opposite side of the vaporizing pipe 1 from the connection end of the jet nozzle 2.

A burner 8 is provided in the front part of the jet nozzle 2, receives the vaporized gas jetted from the jet nozzle 2 to form a mixture, and burns the mixture, which is generated by the spark plug 9. ignited by a spark.

In the liquid fuel combustion apparatus configured in this manner, in order to burn the liquid fuel, first, the sheathed heater 1c is energized to generate heat. When the vaporizing pipe 1 is gradually heated by the sheathed heater 1c and the temperature rises to a predetermined temperature, the pump 7 is driven by the output of the thermistor 3, and the liquid fuel is vaporized through the fuel pipe 6. It is fed into the vaporization chamber of the tube 1, that is, the space between the outer cylinder 1a and the outer peripheral surface of the sheathed heater 1c.

The liquid fuel sent into the vaporization tube 1 is quickly vaporized by coming into contact with the inner wall surface of the outer cylinder 1a, the outer wall surface of the sheathed heater 1c, and the vaporization stabilizing member 1b.

Next, when the electromagnetic solenoid 5 is energized and the valve rod 4 is attracted and moved, the tip opening of the jet nozzle 2, which had been closed by the tip of the valve rod 4, opens and vaporized gas is jetted into the burner 8. be done. At this time,
The vaporized gas ejected from the ejection nozzle 2 becomes an air-fuel mixture and is supplied to the burner 8 by suctioning primary air by the ejector effect.

When a spark is generated in the ignition plug 9, the air-fuel mixture supplied to the inside of the burner 8 is ignited and becomes a flame.

Next, combustion is stopped by stopping the operation of the pump 7 to stop the supply of liquid fuel, and then de-energizing the electromagnetic solenoid 5 to return the valve lever 4 and close the jet nozzle 2 with its tip. It is done by certain things.

[Problem that the invention attempts to solve]

The conventional liquid fuel combustion device is constructed as described above, but when the jet nozzle 2 is brazed to the outer periphery of the vaporizing pipe 1, the jet nozzle 2 is vaporized due to the gap between the two, as shown in FIG. The brazing material 10 may be poured in at an angle with respect to the pipe 1, which causes the positions of the burner 8 and the jet nozzle 2 to shift, reducing the ejector effect and causing an insufficient amount of air suction. , there was a problem with the generation of red flames.

This invention was made in order to solve the above-mentioned problems, and the object is to obtain a liquid fuel combustion device in which the jet nozzle can be attached to the vaporization pipe in a normal state.

[Means for solving the problem] The liquid fuel combustion device according to this invention is provided with a convex portion on the outer periphery of the part of the outer cylinder of the vaporizing tube to which the jet nozzle is connected, and the jet nozzle is press-fitted into this convex portion. It was soldered by hand.

[Effect]

The liquid fuel combustion device according to this invention performs brazing work by press-fitting the jet nozzle into a convex portion provided on the outer periphery of the vaporizing pipe, so that the jet nozzle does not tilt during brazing work. The jet nozzle can always be installed in a normal state.

〔Example〕

An embodiment of this invention will be described below based on the drawings.

FIG. 1 is a cross-sectional view of the connecting part between the jet nozzle 2 and the outer cylinder 1a of the vaporizing tube 1 in this invention, and in the figure, the same reference numerals as in the conventional example shown in FIGS. 3 and 4 denote the same or corresponding parts. shows.

In the figure, reference numeral 1d denotes a plurality of protrusions formed on the outer periphery of the portion of the outer cylinder 1a to which the jet nozzle 2 is coupled, by extruding outward using a mold in advance.

The extrusion height of this convex portion 1d is determined by the ejection nozzle 2
The dimensions should be such that it can be press-fitted in relation to the diameter of the mounting hole.

As a result, as shown in FIG. 1, the jet nozzle 2 can be attached to the outer cylinder 1a of the vaporizing tube 1 without being inclined.

[Effect of idea]

As described above, according to this invention, a convex portion is provided on the outer cylinder of the vaporizer tube, and the jet nozzle is press-fitted into this convex portion, so that the centers of the jet nozzle and the outer cylinder of the vaporizer tube are aligned, and the positions of the burner and the vaporizer tube are also adjusted. A burner that is easy to take out, eliminates the worry of core misalignment, and has little risk of red flame generation is obtained.

Further, the amount of brazing material is reduced by the volume of the convex portion, and an economical effect can also be obtained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the essential parts of a liquid fuel combustion device according to an embodiment of the invention, Fig. 2 is a sectional view of its vaporizing tube outer cylinder, and Fig. 3 is a sectional view showing a conventional liquid fuel combustion device. Figure 4 is an explanatory diagram of the main parts. 1 is a vaporizing tube, 1a is an outer cylinder, 1c is a sheathed heater, 1d is a convex portion, 2 is a jet nozzle, 8 is a burner,
10 is brazing material. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A vaporizer tube that vaporizes liquid fuel using a sheathed heater, a jet nozzle that is connected and fixed to the outer periphery of the vaporizer pipe and jets out the vaporized gas, and the vaporized gas jetted from the jet nozzle is mixed with air and combusted. A liquid fuel combustion device having a burner, characterized in that a convex portion is provided on the outer periphery of the jet nozzle connecting portion of the vaporizing pipe, and the jet nozzle is press-fitted into the convex portion and fixed by brazing.