JPH0960820A - Liquid fuel combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid fuel combustor which enables instantaneous ignition without consuming an excess of power while curtailing costs with a compact designing and a limited number of parts. SOLUTION: An outlet slit 2 is provided at an upper part of a mixing cylinder 1A and a combustion cylinder 3 to cover the outlet slit 2. An air pipe 5 is arranged to be opened on a side wall part of the mixing cylinder 1A, a diffusion cylinder 16 is provided at an upper part of a fuel tank 7 so as to make the upper end of a diffusion cylinder 16 communicate from below the air pipe 5 while a capillary type fuel suction pipe 17 is provided. A vibration part 18 is arranged at the tip of the fuel suction pipe 17, the vibration part 18 is linked to an ultrasonic vibrator 13 and a fuel is diffused being ultra-granulated with the resonation of the vibration part 18. An output voltage to the ultrasonic vibrator 1 from a high frequency oscillation circuit 15 is changed to adjust the diffusion of the fuel from the vibration part 18 thereby controlling the degree of combustion. temperature from rising thereby restraining the generation of NOx.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion device such as a petroleum fan heater, a clean heater and a boiler burner.

[0002]

2. Description of the Related Art As a liquid fuel combustion device, a device for atomizing fuel by heating with a heater is conventionally known.
In addition, there is also known a fuel atomizer which utilizes ultrasonic vibration.

FIG. 3 is a schematic diagram of a heater heating type liquid fuel combustion apparatus which is one of the conventional examples. This liquid fuel combustion apparatus has a vaporization cylinder 1. An outlet slit 2 is provided at an upper portion of the vaporizing cylinder 1, and a combustion cylinder 3 is provided so as to cover the outlet slit 2. Further, the vaporizing cylinder 1 has a double wall on a side wall and a bottom wall, and a heater 4 is installed inside the double wall on the upper side of the side wall. An air pipe 5 for introducing combustion air is arranged so as to open to the side wall of the vaporizing cylinder 1, and a fuel pipe 6 is arranged to supply fuel to the opening position of the air pipe 5. The fuel pipe 6 is connected to a fuel tank 7, and an electromagnetic pump 8 is interposed in the pipe. In this example, the fuel pumped up by the electromagnetic pump 8 is heated by the heater in advance and guided to the vaporizing cylinder 1 having a temperature sufficient to vaporize the fuel, and is vaporized. Then, the vaporized fuel overflows from the outlet slit 2 in the upper part of the vaporization cylinder 1 in a state of being mixed with the combustion air introduced from the air pipe 5, and the combustion portion 3
Combustion. The combustion amount is adjusted by the pumping amount from the electromagnetic pump 8. In the figure, 9 indicates a liquid fuel, and 1
0 indicates the flow of combustion air, and 11 indicates the flow of vaporized fuel. Reference numeral 12 denotes a flame.

FIG. 4 is a schematic view of another conventional liquid fuel combustion apparatus using ultrasonic waves. This liquid fuel combustion device has a compact mixing cylinder 1A instead of the vaporization cylinder 1 in the case of the heater heating method. And the mixing cylinder 1A
The exit slit 2 is provided on the upper part of the
The combustion cylinder 3 is also installed so as to cover the. An air pipe 5 for introducing combustion air is arranged so as to open to the side wall of the mixing cylinder 1A, and a fuel pipe 6 is arranged so as to supply fuel to the opening position of the air pipe 5.
A nozzle 14 connected to the ultrasonic transducer 13 is connected to the tip of the fuel pipe 6. Ultrasonic transducer 13
Is connected to the high frequency oscillation circuit 15. The fuel pipe 6 is connected to a fuel tank 7, and an electromagnetic pump 8 is interposed in the pipe. In this example, fuel pumped by the electromagnetic pump 8 is injected from the nozzle 14. At the same time as the injection, the ultrasonic transducer 13 is vibrated by the output voltage from the high-frequency oscillator circuit 15, and the nozzle 14 connected to the ultrasonic transducer 13 resonates, so that the injected fuel is atomized. Then, the super-atomized fuel mixes with the combustion air introduced from the air pipe 5, then overflows from the outlet slit 2 at the upper part of the mixing cylinder 1 </ b> A, and burns in the combustion cylinder 3. Also in this case, the combustion amount is adjusted by the pumping amount from the electromagnetic pump 8. Further, in the figure, 9 is a liquid fuel, 10 is a flow of combustion air, 11A is an ultra-fine atomized fuel, and 12 is a flame.

[0005]

Among the above-mentioned conventional liquid fuel combustion devices, the heater heating type shown in FIG.
Not only is there a large number of parts and a complicated and large vaporizing cylinder equipped with a heater, but in order for the user to instantly ignite when necessary, the heater must be activated in advance. Therefore, there is a drawback that the power consumption increases. In addition, the ultrasonic vibration type shown in FIG. 4 does not require a vaporization cylinder equipped with a heater, and the user can operate the ultrasonic vibrator for atomizing the fuel in advance. It can be instantly ignited by switching on when necessary, and does not consume extra power, but an electromagnetic pump or the like is indispensable for pumping up and metering fuel, so there is a need to reduce the number of parts and cost. Can't answer enough.

The present invention has been made in view of the above problems, and is capable of instantaneous ignition without consuming extra power, is compact, has a small number of parts, and enables cost reduction. It is an object to provide a fuel combustion device.

[0007]

As a means for solving the above-mentioned problems, the present invention is a liquid fuel combustion apparatus which atomizes fuel and mixes it with combustion air to burn the fuel, which is supplied to a combustion space. The present invention provides a liquid fuel combustion apparatus which is provided with means for adjusting the combustion amount by changing the vibration of the ultrasonic vibrator, while atomizing the particles using the vibration of the ultrasonic vibrator. More specifically, this liquid fuel combustion apparatus is configured, for example, by connecting a vibration part to an ultrasonic vibrator, guiding fuel to the vibration part, and vibrating the ultrasonic vibrator by an output voltage from an oscillation circuit. The vibrating portion is resonated to atomize and diffuse the fuel, and the output voltage from the oscillating circuit is changed to adjust the fuel diffusion amount from the vibrating portion to control the combustion amount. Here, it is preferable that the vibrating section uses a plate or the like having innumerable fine holes. Further, the fuel can be supplied to the vibrating portion by utilizing the capillary phenomenon.

The liquid fuel combustion apparatus of the present invention uses an ultrasonic vibration system, and not only consumes no extra power for instantaneous ignition, but also does not require a vaporizing cylinder equipped with a heater. It is possible to make it compact by using the ultrasonic vibrating method, and the vibrating part connected to the ultrasonic vibrator has a fuel metering function. Since it can be performed by utilizing the pump, a pump or the like is unnecessary, and the number of parts and the cost can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram of a liquid fuel combustion apparatus showing an example of an embodiment of the present invention. This liquid fuel combustion apparatus has a mixing cylinder 1A, an exit slit 2 is provided in the upper part of the mixing cylinder 1A, and a combustion cylinder 3 is installed so as to cover the exit slit 2. An air pipe 5 for introducing combustion air is arranged so as to open to the side wall of the mixing cylinder 1A. In addition, the diffusion cylinder 1 is provided above the fuel tank 7.
6 is provided, and the upper end of the diffusion tube 16 is arranged to communicate with the middle of the passage of the air tube 5 from below. A capillary-type fuel suction pipe 17 is provided whose upper end projects from below into the inside of the diffusion cylinder 16 and whose lower end hangs down inside the fuel tank 7 to near the bottom surface. A vibrating portion 18 connected to the ultrasonic transducer 13 is disposed at the tip of the fuel suction pipe 17 protruding inside the diffusion cylinder 16. The ultrasonic oscillator 13 is connected to the high frequency oscillation circuit 15. As the vibrating portion 18, a lightweight and innumerable plate having fine holes is used. The vibrating portion 18 may be other than a plate as long as the vibration of the ultrasonic vibrator 13 is sufficiently transmitted and the fuel can be diffused by the vibration.

In the example shown in FIG. 1, the fuel is sucked up from the fuel tank 7 by the fuel suction pipe 17 by utilizing the capillary phenomenon and guided to the vibrating portion 18. Therefore, when the high-frequency oscillator circuit 15 is operated, the ultrasonic transducer 13 vibrates due to the output voltage thereof, and the vibrating portion 18 connected to the ultrasonic transducer 13 resonates to diffuse the fuel while atomizing it.
Then, the fuel atomized and diffused is sufficiently mixed with the combustion air from the air pipe 5, overflows from the outlet slit 2 in the upper part of the mixing cylinder 1A, and is burned in the combustion cylinder 3. In FIG. 1, 9 is liquid fuel, 10 is flow of combustion air, 11A
Indicates ultra-fine atomized fuel, and 12 indicates flame.

Also, in this example, the combustion amount is controlled by changing the output voltage from the high-frequency oscillation circuit 15 to the ultrasonic oscillator 13 and adjusting the fuel diffusion amount from the vibrating portion 18. FIG. 2 shows an example of changes in the fuel diffusion amount when the output voltage from the high frequency oscillator circuit is changed.

[0012]

In the liquid fuel combustion apparatus of the present invention, the liquid fuel is atomized and supplied by utilizing ultrasonic vibration, so that extra power is consumed for instantaneous ignition like the heater heating method. In addition, there is no need to provide a vaporizing cylinder with a heater like the heater heating method, and it is possible to make it compact. Moreover, while using the ultrasonic vibration method, the vibration part connected to the ultrasonic vibrator is used. Since the fuel metering function can be provided, no pump or the like is required, and the number of parts and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a liquid fuel combustion apparatus showing an example of an embodiment of the present invention.

FIG. 2 is a graph showing an example of changes in the fuel diffusion amount when the output voltage from the high frequency oscillation circuit is changed.

FIG. 3 is a schematic view of a heater heating type liquid fuel combustion apparatus which is one of conventional examples.

FIG. 4 is a schematic view of another conventional example of a liquid fuel combustion apparatus using ultrasonic waves.

[Explanation of symbols]

 1A Mixing cylinder 3 Combustion cylinder 5 Air pipe 7 Fuel tank 13 Ultrasonic vibrator 15 High frequency oscillation circuit 16 Diffusion cylinder 17 Fuel suction pipe 18 Vibration part

Claims (4)

[Claims] 1. A liquid fuel combustion apparatus that atomizes fuel and mixes it with combustion air for combustion, wherein the fuel supplied to the combustion space is atomized by utilizing the vibration of an ultrasonic transducer and is burned. A liquid fuel combustion apparatus, characterized in that means for adjusting the amount by the vibration change of the ultrasonic oscillator is provided. 2. A vibrating section is connected to the ultrasonic transducer,
The fuel is guided to the vibrating section, and the ultrasonic transducer is vibrated by the output voltage from the oscillation circuit to resonate the vibrating section to atomize and diffuse the fuel and change the output voltage from the oscillation circuit. The liquid fuel combustion apparatus according to claim 1, wherein the fuel diffusion amount from the vibrating section is adjusted to control the combustion amount. 3. The liquid fuel combustion apparatus according to claim 2, wherein the vibrating portion is a member having innumerable fine holes. 4. The liquid fuel combustion apparatus according to claim 2, wherein the fuel is guided to the vibrating portion by means utilizing a capillary phenomenon.