JPH03122407A - Combustion device with ultrasonic atomization device - Google Patents

Abstract

PURPOSE:To provide a stable combustion, prevent soot from adhering to an ignition means and improve an igniting characteristic by a method wherein a swirl air generating means is arranged between a fuel supplying means and an atomization part while keeping a predetermined distance therebetween, and the ignition means is arranged in such a way as a predetermined distance being kept from an axis of a vibrator horn and no electrical leakage occurs with the swirl air generating means. CONSTITUTION:A swirl vane 12a is cut and raised between a fuel supplying means 5 and an atomization part 4. A swirl plate 12 provided with a recess 12b for inserting an ignition plug 10a. A distance L between this plate 12 and an extreme end of the atomization part 4 is set to a range of 1/4 to 3/4 of a diameter D of the atomization part 4. The ignition plug 10a is placed in a non-contacted condition through the recess 12b of the plate 12 between the vane 12a and a vibrator horn 3. A distance H between it and an axis of the vibrator horn 3 is set at a value more than 1/2 of the diameter D of the atomization part 4. With such an arrangement, fuel and air are uniformly mixed and then combustion is stabilized. Adhering of soot to the ignition plug can be prevented and an igniting characteristic can be improved.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention generally relates to a combustion device equipped with an ultrasonic atomizer for atomizing supplied liquid fuel using ultrasonic vibration, and The present invention relates to a combustion device with an ultrasonic atomizer that is suitably used in commercial and domestic boilers, heating furnaces, water heaters, dryers, gas turbines, heating burners, and the like.

[Conventional technology]

Until now, in combustion devices such as boilers and fan heaters, when burning the supplied liquid fuel, from the viewpoint of combustion performance, this liquid fuel has been reduced to an extremely small size (,
In addition, it is desirable to atomize and supply the droplets with a uniform particle size.

BACKGROUND ART Conventionally, an ultrasonic atomization device that atomizes supplied liquid fuel using ultrasonic vibration is known as such a device that atomizes liquid fuel into extremely small droplet size. In this type of ultrasonic atomizer, in order to ensure good atomization efficiency over a wide fuel supply range, it is necessary to stabilize combustion by promoting the mixing of atomized droplets with air. Required. Various efforts have been made for this purpose.

For example, in Utility Model Application Publication No. 83-187022,
A method has been proposed in which atomized fuel droplets are sent to a combustion chamber, where they are ignited by a spark plug, and the fuel droplets are sent into the combustion chamber by an air swirl flow.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional ultrasonic atomization device,
After the fuel is atomized, the atomized droplets are conveyed by a swirling air flow, resulting in non-uniform mixing of the atomized camphor droplets and air.
The problem is that combustion becomes unstable.

Furthermore, since the spark plug is always placed in the fuel droplets, there is a problem in that the medium adheres to the spark plug, resulting in poor ignition performance.

The present invention solves the above problems, and provides a combustion device with an ultrasonic atomizer that can stabilize combustion and improve ignitability by homogenizing the mixing of atomized droplets and air. The purpose is to

[Means to solve the problem]

To this end, the ultrasonic atomizer of the present invention includes an ultrasonic vibration generating means 2, a vibrator horn 3 connected to the ultrasonic generating means, and an atomizing section 4 formed at the tip of the vibrator horn. ,
a fuel supply means 5a16a that supplies fuel to the atomization section;
It has an ignition means 10a and a swirl flow generation means 12 disposed between the fuel supply means and the atomization section, and the distance between the swirl flow generation means 12 and the tip of the atomization section 4 is atomized. The distance between the ignition means 10a and the axis of the vibrator horn 3 is set to 1/4 to 3/4 of the diameter of the atomizing part 4.
/2 or more and is set at a position where there is no electrical leakage with the swirling flow generating means 12.

Note that the numbers added to the above configurations are for comparison with the drawings to facilitate understanding, and the configurations of the present invention are not limited thereby.

[Effect]

In the present invention, for example, as shown in FIG. 1, fuel is atomized toward the atomization section 4 of the vibrator horn 3 through the liquid supply path 5a16a, and the liquid that has reached the atomization section 4 is
It is atomized by ultrasonic vibrations from the ultrasonic vibration generator 2. At this time, the atomized droplets are ignited by the ignition means 10a and are immediately transported by the swirling flow generated by the swirling flow generation means 12, so that the medium does not adhere to the ignition means 10a and combustion is prevented. Stability can be improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure is a cross-sectional view showing one embodiment of the combustion apparatus with an ultrasonic atomizer of the present invention, and FIG. 2 is a cross-sectional view taken along the line -U in FIG. 1.

In FIG. 1, an ultrasonic atomizer 1 includes an ultrasonic vibration generator 2 at its base for generating ultrasonic vibrations, and a vibrator horn 3 is connected to the ultrasonic vibration generator 2. At the tip of this vibrator horn 3, an atomizing section 4 having a hollow tip is formed. On the outer periphery of the vibrator horn 3,
A liquid supply member 5 is provided, and a liquid supply nozzle member 6 is screwed onto the inner periphery of the liquid supply member 5. The liquid supply member 5 and the liquid supply nozzle member 6 each have a liquid supply path 5az8.
a is formed.

The ultrasonic atomization device 1 is fixed by a support portion 8 provided on the housing 7, and an ignition device 10 is disposed on the outer periphery of the liquid supply member 5 with a mounting band 9. Also,
An outer cylinder 11 that covers the ultrasonic atomizer 1 is provided at the tip of the housing 7 .

On the outer periphery of the vibrator horn 3, a swing plate 12 is provided, which is formed by cutting and raising a spark plug 10a and a swing blade 12a of an ignition device 10. As shown in FIG. 2, a notch 12b is formed in the upper part of the rotating plate 12, and a spark plug 10a is disposed between the notch 12a and the vibrator horn 3.

This is to ensure electrical insulation between the spark plug 10a and the rotating plate 12. The housing 7 is connected to an air blower (not shown), and the air is supplied to the ultrasonic atomizer 1.
It flows toward the rotating plate 12 through the outer periphery of the rotating plate 12 .

As a result of various experiments, the rotating plate 12 and the vibrator horn 3
The distance between the tip of the atomizing part 4 and the diameter of the atomizing part 4 is D.
Then, the range is D/4 to 3D/4, preferably D/2
It has been found that combustion stability is good if the position is set to . This is because if L is made too small, the atomized droplets will collide with the rotating plate 12, and if L is made too large, the droplets will scatter.

Further, the distance H between the spark plug 10a and the axis of the vibrator horn 3 is D/2 or more, and the position where there is no electrical leakage with the swivel plate, preferably, the tip of the spark plug 10a is in the atomizing part 4 as shown in the figure. A position (D/2) matching the outer diameter is preferred. This is because this position is a position where no flame is formed, so the ignitability is good and the medium does not adhere to the spark plug 10a.

The operation of the present invention having the above configuration will be explained. The fuel is atomized toward the atomization surface 4 of the vibrator horn 3 through the liquid supply path 5as6a, and the liquid that has reached the atomization surface 4 is
It is atomized by ultrasonic vibrations from the ultrasonic vibration generator 2. At this time, the atomized droplets are ignited by the spark plug 10a and are immediately transported by the swirling flow generated by the swirling plate 12, so that the medium does not adhere to the spark plug 10a and the combustion is stabilized. It is something that can be improved.

〔Effect of the invention〕

As described above, according to the combustion apparatus with an ultrasonic enrichment device of the present invention, since the swirling flow generating means is disposed upstream of the atomization section of the vibrator horn, the combustion gas is immediately absorbed by the swirling flow generating means. The fuel is transported by the swirling flow generated by this process, which makes it possible to homogenize the mixture with air and stabilize combustion.

Further, since the tip of the ignition means is a position where no flame is formed, the ignitability is good and the adhesion of the medium to the ignition means can be prevented, thereby improving the ignition performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a combustion apparatus with an ultrasonic atomizer according to the present invention, and FIG. 2 is a sectional view taken along the line n--■ in FIG. 1. 1... Ultrasonic atomization device, 2... Ultrasonic vibration generator,
3... Vibrator horn, 4... Atomization section, 5 ale
a...Fuel supply means, 10a...Spark plug (ignition means), 12...Swirling plate (swirling flow generating means). Applicant: Tonen Corporation

Claims (2)

[Claims] (1) Ultrasonic vibration generating means, a vibrator horn connected to the ultrasonic generating means, an atomizing section formed at the tip of the vibrating horn, and a fuel supply supplying fuel to the atomizing section means, an ignition means and a swirling flow generating means disposed between the fuel supply means and the atomizing section, and the distance between the swirling flow generating means and the tip of the atomizing section is determined by the distance between the swirling flow generating means and the tip of the atomizing section. 1/4 to 3/ of the diameter of
4, and the distance between the ignition means and the axis of the vibrator horn is set at a position that is 1/2 or more of the diameter of the atomizing section and at a position that does not cause electrical leakage to the swirling flow generating means. Combustion device with ultrasonic atomization device. (2) The combustion apparatus with an ultrasonic atomizer according to claim 1, wherein a notch is formed in the swirling flow generating means, and an ignition means is disposed between the notch and the vibrator horn.