JPH0229387Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a liquid fuel combustion device that uses a needle to supply liquid fuel to the inside of a vaporizing cylinder and atomizes the liquid fuel with this needle.

[Conventional technology]

This type of liquid fuel combustion device had a configuration as shown in FIG. In Fig. 1, 1 is a vaporizing cylinder, 2 is a burner head fixing part, 3 is a burner head, and 4 is a preheating heater.The burner head 3 is attached to the burner head fixing part 2, and these are the preheating heater 4 is fixed to the upper part of the vaporizer cylinder 1 into which it is cast. Reference numeral 5 denotes a flame, and during combustion, the temperature of the vaporizer cylinder 1 is maintained at a certain temperature by heat recovery from the flame 5. Primary air for combustion is introduced into the vaporization cylinder 1 from a combustion turbo fan 6 through a blowing system path 7 and a nozzle portion 8 . Fuel is sent from the cartridge tank 9 to the oil supply pipe 11 via the oil receiving tray 10, guided to the oil level regulator 13 by the electromagnetic pump 12, and sprayed into the vaporizer cylinder 1 by air pressure. The preheating heater 4 cast into the vaporization cylinder 1 is energized to preheat the vaporization cylinder 1 to a predetermined temperature, and after the preheating is completed, only primary air is supplied to the vaporization cylinder 1 for several tens of seconds by the combustion turbo fan 6. The unburned gas in the vaporizer cylinder 1 is removed. Thereafter, the pressurizing solenoid 14 is opened to apply air pressure to the oil level regulator 13, thereby applying pressure to the kerosene pumped by the electromagnetic pump 12. The flow rate of kerosene is controlled in an orifice 15, and the kerosene is atomized and sprayed into the vaporizing cylinder 1 with a needle 16. After the atomized kerosene is vaporized in the vaporizer cylinder 1, it mixes with air, passes through the central hole of the burner head fixing part 2, and is discharged from the outer periphery of the burner head 3. The released mixed gas is ignited by the spark plug 17, forms a flame 5, and burns.

Regarding the conventional atomization of liquid fuel, the shape of the tip of the needle 16 is cut from one direction of the upper surface toward the bottom of the tip as shown in FIGS. 2a and 2b.
Since a face-cut type was used, the needle tip angles θ ₁ ′ and θ ₂ ′ were relatively large, and when the amount of liquid fuel supplied decreased, the atomization characteristics deteriorated.
The drawback was that the liquid fuel dripped and pulsated, and the amount of liquid fuel supplied could not be reduced.

[Summary of the idea]

This idea was made in order to eliminate the drawbacks of the conventional ones as described above, and by making the shape of the tip of the needle part into a two-sided cut shape, which is cut from two diagonal directions toward the tip of the needle part, By cutting a spiral groove inside, the atomization properties are further improved.

[Example of idea]

An embodiment of this invention will be described below. Fig. 3 shows the needle 18 of this invention, and the needle tip shape is a two-sided cut shape with the upper surface cut from two diagonal directions toward the tip, and the needle tip angles θ ₁ and θ ₂ are even more than the conventional one. It has an acute angle. With this kind of structure, the needle 18
The liquid fuel that has passed through the interior is atomized at the tip of the needle and sent to the inside of the vaporizer cylinder 1.The atomization properties are good, and even if the amount of liquid fuel is reduced, there will be no dripping or dripping of the liquid fuel. , pulsation disappears. Similarly, FIG. 4 also shows a needle 1 of another embodiment of this invention.
8', in this case, a spiral groove 19 is cut inside the needle 18', and when the liquid fuel passing through the inside of the needle 18' passes through the inside of the needle 18', the liquid fuel passes through the inside of the needle 18'. When the needle is given a rotational motion and exits from the tip of the needle, the kinetic energy of the rotation further improves the atomization properties. Therefore, even if the amount of liquid fuel is reduced, there will be no dropout or pulsation of the liquid fuel.

[Effect of idea]

As described above, according to this invention, there is no dripping or pulsation of the liquid fuel even if the combustion amount is reduced, and a liquid fuel combustion device having a wide combustion range can be obtained.

[Brief explanation of the drawing]

Figure 1 is a simplified sectional view showing a liquid fuel combustion device;
Figures 2a and b are a plan view and a side view of a conventional needle, Figures 3a and b are a plane view and a side view of a needle of the present invention, and Figure 4 is a side view of a needle of another embodiment of this invention. It is a diagram. 1... Vaporizing cylinder, 4... Preheating heater, 18,1
8'...Needle, 19...Spiral groove.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) After liquid fuel and air are pressure-fed into a vaporization cylinder that has been preheated with a preheating heater, etc., and the liquid fuel is vaporized,
A liquid fuel combustion device in which the liquid fuel is mixed with air and combusted, characterized in that the tip of the needle for feeding the liquid fuel into the vaporizing cylinder has a two-sided cut shape in which the upper surface is cut from two diagonal directions toward the tip. Combustion device. (2) The liquid fuel combustion device according to claim (1), wherein the needle has a spiral groove formed on its inner surface.