JPH0113264Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquid fuel combustion device.

BACKGROUND ART Conventionally, self-heating premix combustion devices that vaporize liquid fuel using combustion heat employ various methods to vaporize liquid fuel such as kerosene at the start of combustion. For example, attaching an electric heater to the vaporizer,
A method of supplying fuel after raising the temperature to a certain level, a method of supplying fuel after raising the temperature of the vaporizer from the outside with a separate combustion device, a method of rotating the vaporizer and using droplet spray combustion due to the centrifugal force of the initial rotation. There are methods to raise the temperature. However, we have not yet seen the emergence of an excellent liquid fuel combustion device that has a quick start-up, does not produce white smoke or odor, is clean and compact.

The purpose of the present invention is to provide a liquid fuel combustion device as a premix combustion device that is excellent in quick start-up, cleanliness, and compactness.

A detailed explanation will be given below based on an embodiment shown in the drawings. In Fig. 1, 1 is a burner case;
It is connected to a blowing means 2 and forms an air chamber 3 inside. An inner cylinder 4 is provided downstream (ie, in front) of the air chamber 3, and a secondary air passage 5 is formed between it and the burner case 1. There are many 2 on the inner cylinder 4 side circumferential surface.
A secondary air hole 6 is provided. In the center of the combustion chamber 8 inside the inner cylinder 4 is a bottomed cylindrical carburetor 7 with a closed front end.
is provided to form a vaporization chamber 9 inside. At the rear end of the vaporizer 7, there is a gas passage 2 that communicates with the inside of the vaporizer 7.
A gas ejection hole 10 provided at 5 is opened toward the combustion chamber 8 . There is a flame port 11 in front of the gas outlet 10.
is opened, and a ventilation gap 12 communicating with the air chamber 3 is provided between the gas outlet 10 and the flame port 11. 13 is a pilot burner provided in the center of the vaporization chamber 9, and a jet nozzle 14 communicating with the air chamber 3;
a bottomed cylindrical pilot tube 16 with an air hole 15 on its side circumferential surface, a vaporizing tube 17 provided in front of the air port 15 with its front end closed and a gas outlet 18 on its side circumferential surface; A spraying means 19 for spraying liquid fuel into the cylinder 17 and a vaporizing cylinder 1 for igniting the sprayed fuel.
ignition means 20 for forming internal combustion. Reference numeral 21 denotes an oil feeding means, which is provided beside the pilot burner 13 and is inclined so as to evenly supply fuel to the upper part of the carburetor 7. 22 is an ignition means, and 23 is a flame detection means, both of which are provided near the flame port 11. 24 is a temperature sensor that detects the temperature of the gas passage 25. 26 is a valve that controls the supply of liquid fuel to the spraying means 19 and the oil feeding means 21.

The present invention has such a configuration, and its operation will be explained next. The air blowing means 2 is operated to open the air chamber 3.
Blow air inside. Air flows from the air port 15 to the vaporization tube 17
Inside, the gas flows into the vaporization chamber 9 from the spout 14 . The valve 26 is operated to spray the liquid fuel into the vaporization cylinder 17 from the spraying means 19, and the ignition means 20 ignites it. A portion of the liquid fuel is burned in the vaporization tube 17, and the remaining particles are vaporized by the heat and flow out of the vaporization tube 17 from the gas outlet 18 together with the exhaust gas. Then, the vaporized gas is supplied with air from the jet nozzle 14, and is ignited by the high-temperature exhaust gas to undergo diffusion vaporization and combustion.
This combustion heats the carburetor 7 from the inside and the vaporization tube 17 from the outside. Therefore, vaporization continues in the vaporization cylinder 17, and the gas passage 25 also becomes an exhaust gas passage, so that the temperature rises. When the temperature sensor 24 senses that the temperature of the gas passage 25 has become constant, the spraying means 19 and the ignition means 20 are stopped.
Thereafter, when the valve 26 is operated to supply liquid fuel to the oil supply means 21, the fuel absorbs heat from the vaporizer 7 and is vaporized. At this time, air port 1 of pilot burner 13
5. Since the air is sent into the vaporization chamber 9 from the ejection port 14, the vaporized gas passes through the gas passage 25 and is ejected from the gas ejection port 10 while being mixed with air. Then, while sucking the air in the ventilation gap 12, the flame port 11
It flows out into the combustion chamber 8. When the ignition means 22 is activated here, premixed combustion is formed. On the other hand, the air sent from the air chamber 3 to the secondary air passage 5 is ejected into the combustion chamber 8 from the secondary air hole 6 to complete combustion. The vaporizer 7 is heated from the outside by this heat, and vaporization continues.

As described above, this invention has a compact pilot burner that instantaneously forms diffusion vaporization combustion installed in the vaporization cylinder, so that the startup is quick and there is no initial soot generation, and the gas passage during premix combustion also heats up. Since the vaporized gas does not re-liquefy, it can be turned on in a short time.
- Even if the switch is turned OFF repeatedly, there is no white smoke or odor when the fire is extinguished. Furthermore, since the main oil supply means is arranged at an angle next to the pilot burner, the entire apparatus can be made compact. Furthermore, by providing a ventilation gap in the flame opening as in the embodiment, the flame opening surface can be cooled, backfire can be prevented, and the capacity control range can be increased. Note that the temperature sensor may not be provided, and in that case, the valve may be controlled by a timer or the like.

FIG. 2 shows another example of the flame opening.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view showing another example of the flame port. 2... Air blowing means, 8... Combustion chamber, 9... Vaporization chamber, 13... Pilot burner, 14... Jet nozzle, 15... Air port, 17... Vaporization tube, 18...
Gas outlet, 19... spraying means, 20... ignition means, 21... oil feeding means.

Claims (1)

[Scope of utility model registration request] A blowing means for supplying combustion air, an oil supply means for supplying liquid fuel, a bottomed cylindrical carburetor whose front end is closed and a vaporization chamber is formed inside, and a premixture generated in the vaporization chamber. and a flame port that injects the fuel into the combustion chamber formed on the outer periphery of the vaporizer to form premixed combustion,
In a device that self-heats the wall of the vaporization chamber by combustion in the combustion chamber, the vaporization chamber includes a bottomed cylindrical pilot tube having a jet port communicating with the blowing means on the side circumferential surface and an air hole in the bottom surface; A pilot burner consisting of a vaporizing cylinder provided in front of the hole, closing the front end and having a gas outlet on the side peripheral surface, a spraying means for spraying liquid fuel into the vaporizing cylinder, and an ignition means for igniting the sprayed fuel. A liquid fuel combustion device characterized by being provided with.