JPS6138766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device, and particularly to a cylindrical combustion device that vaporizes and transports fuel by bringing heated air into contact with a vaporization section containing liquid fuel. The purpose of the present invention is to provide a means for eliminating the unstable transient combustion state during ignition and extinguishing by opening and closing the exposure of the vaporizing section to heated air, thereby making it possible to complete ignition or extinguishing instantly. . Traditionally, combustion devices such as wick type or pot type that suck up liquid fuel through a porous material and vaporize it have been widely used, but both generate toxic carbon monoxide, soot, and odors when ignited or extinguished. This phenomenon was unavoidable and a constant drawback. First, in the wick type, when igniting, the tip of the wick exposed to the vaporization chamber is ignited by an ignition heater.
The combustion heat gradually increases the amount of fuel vaporized and shifts to a stable combustion state, but in the initial stage of ignition, most of the combustion heat is consumed to raise the temperature of the fuel contained in the vaporization chamber and the wick. Therefore, sufficient fuel vaporization cannot be obtained. Therefore, during this period, the balance between air and fuel gas was disrupted, leading to incomplete combustion, resulting in the generation of extremely large amounts of carbon monoxide, soot, and odor, which sometimes continued for several minutes.
On the other hand, when extinguishing a fire, the wick exposed in the vaporization chamber is generally pushed down and removed to extinguish the fire. However, the pushed-down wick is not stored in a sealed chamber, but is directly connected to the air flow inside the vaporization chamber. Even after the fire is extinguished, the fuel gas is vaporized due to its own heat, and this gas is thermally decomposed in the high-temperature vaporization chamber or combustion chamber and released, causing a significant odor.

On the other hand, in the pot type, when ignited, the temperature of the vaporizing atmosphere remains sufficiently raised, resulting in incomplete combustion, producing carbon monoxide, soot, odor, etc., just as in the above-mentioned wick type. When extinguishing a fire, the fuel supply is stopped and the fire is completed when the fuel remaining in the vaporization chamber is completely vaporized, but even though the amount of supplied air is almost constant, the amount of fuel vaporized gradually decreases. Because of this, the balance between air and fuel gas is disrupted, and carbon monoxide, soot,
This method has the disadvantage of emitting odors and the like over a long period of time.

The present invention provides means for solving the above-mentioned conventional drawbacks and enabling ignition or extinguishing without unstable transient combustion conditions.One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 3, a burner 1 has a cylindrical outer shape, and is provided with a cylindrical vaporizing section 2 made of a heat-resistant porous material on its lower outer periphery. Reference numeral 3 denotes a support body that holds the vaporizing section 2, and openings 3a are provided at appropriate intervals on the inner wall. A vaporization chamber 4 is inscribed in the support 3, and an opening 4a having approximately the same diameter is provided at a position that substantially coincides with the opening 3a of the support 3. Reference numeral 5 denotes an air supply section, and a large number of air holes 5a are bored around the periphery. 6 is a heater for heating the air, and a honeycomb-shaped heater with positive temperature characteristics is used. Also, above the vaporization chamber 4 is a mixing space 7.
The flame port 8 is connected above it. Reference numeral 9 denotes a fuel supply pipe that supplies fuel to the vaporization section 2. Here, a rack 10 is attached to the outer wall of the support 3, and a pinion 11 is attached to this rack 10.
are fitted and connected to the knob 13 via the shaft 12.

In the above configuration, during normal combustion, fuel supplied from the fuel supply pipe 9 is sucked up into the vaporization section 2 and held therein. On the other hand, air sent by a fan (not shown) is heated to a substantially constant temperature by the heater 6 and then blown out from the air hole 5a of the air supply section 5. This high-temperature air comes into contact with the exposed surface of the vaporization section 2 through an opening 4a provided in the side wall of the vaporization chamber 4 and an opening 3a provided in the support 3, and supplies vaporization latent heat of the fuel. The vaporized fuel gas is carried out and sufficiently mixed in a mixing space 7 located downstream of the vaporization chamber 4. This mixed gas is ejected from the flame port 8 further downstream and combusted to form a flame.

Here, by turning the knob 13, the pinion 11 and the rack 10 are engaged, and the vaporizing part 2 and the support body 3 are moved around the vaporizing chamber 4 as shown in FIG. 3 so that the openings 3a and 4a do not overlap with each other. By rotating it to this position, the vaporizing section 2 is completely shielded from the vaporizing chamber 4 and fuel vaporization is stopped, so that the fire can be completely extinguished instantly. Therefore, the fire can be extinguished without going through the unstable transient combustion state as in conventional methods.
The generation of carbon monoxide, soot, odor, etc. can be almost completely avoided. Here, even after the fire is extinguished, the high-temperature air will not overheat abnormally due to the self-temperature control characteristics of the heater 6, so it may be possible to manually stop the power supply separately at an appropriate time, but as soon as the fire is extinguished, each part of the burner 1 Turn knob 13 to cool the
It is preferable to use means for stopping the energization of the heater 6 in conjunction with the above.

On the other hand, at the time of ignition, the heater 6 is energized and air is supplied from a state where the openings 3a and 4a are closed, and the temperature around the vaporization chamber 4 and the vaporization section 2 is sufficiently raised by the high-temperature air. If you turn the rear knob 13 to connect the openings 3a and 4a and ignite them, the heating of the atmosphere has been completed, so you can instantly transition to an almost completely stable combustion state, eliminating the instability seen in the past. There is no transient combustion, and the generation of carbon monoxide, soot, and odor can be prevented.

Furthermore, since the flame nozzle 8 is sufficiently preheated by high-temperature air during ignition, the stability of the flame formed here is also improved, and the ignition means can be sufficiently reliably ignited by piezoelectric ignition or high-pressure discharge ignition. It is also possible to prevent phenomena such as release of fuel gas due to ignition errors.

As described above, the present invention provides a concrete structure for exposing or shielding the cylindrical core from heated air for fuel vaporization in a cylindrical liquid fuel combustion device, and for igniting and extinguishing the cylindrical core. It is possible to avoid unstable transient combustion conditions and prevent the generation of carbon monoxide, soot, odor, etc.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a liquid fuel combustion device according to an embodiment of the present invention, FIG. 2 is a plan sectional view thereof, and FIG.
The figure is a sectional view of the main part. DESCRIPTION OF SYMBOLS 1... Burner, 2... Vaporization part, 3... Support, 3a... Opening (of the support), 4... Vaporization chamber, 4a... Opening (of the vaporization chamber), 5... Air supply Part, 5a... Air hole, 6... Heater, 10...
Rack, 11...pinion, 13...knob.

Claims (1)

[Claims] 1. Heating a cylindrical porous body, an air supply means having an air hole formed in the center of the cylindrical porous body, inner and outer supports supporting the porous body, and air sent to the air supply means. and means for moving the inner support in a circumferential direction of the porous body, the inner support having an opening, and rotating the inner support to close the air holes of the porous body. A liquid fuel combustion device characterized by controlling the exposed area of the side facing the .