JPS5945884B2 - Ultrasonic combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic combustion device that atomizes and burns fuel oil using ultrasonic waves.

Conventional ultrasonic combustion devices are configured to use the vibration energy of an ultrasonic vibrator to mix air with atomized fuel oil and supply it to the combustion chamber for combustion. When fuel oil is atomized by energy, a stable atomization state is maintained continuously due to fluctuations in the liquid level of the fuel oil, viscosity of the fuel oil, and fluctuations in the liquid column formed by vibration energy. It is difficult to
Therefore, there is a large amount of oil that flies into the air as coarse particles and returns to the original oil due to its own weight.Also, by the time it reaches the combustion chamber, it adheres to the wall surface and becomes droplets, which descend due to its own weight and become oily. Since the amount of oil that returns to the tank increases, the amount of oil that contributes to combustion decreases, resulting in unstable combustion conditions and reduced combustion performance.

For this reason, consideration was given to increasing the output of the ultrasonic vibrator to promote atomization, but when used in a general household, the increase in the output of the ultrasonic vibrator caused the type of intrusion into equipment such as radios. There has been a problem in that the amount of water increases, causing inconvenience.

The present invention promotes the vaporization of fine particles of fuel oil, and during combustion, utilizes the heat of the combustion tube, which is heated by the heat of combustion at the flame port provided in the combustion tube, to promote the vaporization of fine particles and improve combustion efficiency. The purpose of this invention is to increase the vibration energy and promote the atomization of combustion oil with limited vibrator output, thereby increasing the combustion capacity.One embodiment of the present invention will be explained below with reference to the drawings. do.

1 is a fuel tank, 2 is a supply pipe for replenishing the fuel tank 1 with fuel oil 3, and 4 is a convergence horn that penetrates the bottom of the fuel tank 1 and projects into the fuel tank 1, and is connected through an O-ring 5. , is attached to the fuel tank 1 with a lid 6.

Reference numeral 7 denotes a vibrator, which is provided inside the convergence horn 4 via an elastic body 8.

9 is an ultrasonic oscillator connected to the vibrator 7;

10 is a through hole provided so that the fuel oil 3 enters into the convergence horn 4; 11 is a blower that supplies air into the fuel tank 1; 12 is a heat insulating material 13 at the upper opening of the fuel tank 1;
It is a cover that can be attached through the opening 1 in the center.
4 is provided.

A combustion cylinder 15 is attached to the opening 14 of the cover 12 via a heat insulating material 16, and its lower part projects inward of the cover 12.

17 is a through hole provided in the part of the combustion tube 15 that protrudes inward from the cover 12 and serves as an air flow path; 18 is a bowl-shaped foamed metal hole with an opening in the center through which fine particles of fuel oil pass; The first vaporized body is provided at the lower part of the combustion cylinder 15.

Reference numeral 19 denotes a second vaporized body made of foamed metal having a cross-shaped horizontal cross section, and is provided within the combustion tube 15 .

20 is an auxiliary heater provided on the outer periphery of the combustion tube 15 to heat the combustion tube 15; 21 is a flame port provided in the combustion tube 15; 22 is a combustion chamber provided in communication with the combustion tube 15;
Reference numeral 23 designates an air branch pipe for secondary combustion, one end of which communicates with the air layer within the fuel tank 1, and the other end of which communicates with the combustion chamber 22.

The operation of the ultrasonic combustion device configured as above will be explained.

When the ultrasonic oscillator 9 is driven, a high frequency output is applied to the vibrator 7, and the vibrator 7 resonates at a frequency of about 1.7 MHz in the thickness direction. Vibration is transmitted to the fuel oil 3 flowing into the convergence horn 4, and this vibration energy forms a fountain-shaped liquid column on the convergence horn 4, and fuel particles with a particle size of several microns are ejected from the tip of the liquid column. Occur.

At this time, since the focusing horn 4 is provided, the energy density near the focusing point of the focusing horn 4 becomes large, and the atomization ability is enhanced.

On the other hand, combustion air is supplied to the fuel tank 1 by driving the blower 11.
It mixes with the atomized combustion oil sent into the combustion chamber, flows into the combustion tube 15 through the central part of the lower surface of the combustion tube 15 heated by the auxiliary heater 20, and the through hole 17 provided in the combustion tube 15, and flows into the combustion tube 15 through the through hole 17 provided in the combustion tube 15. The fine fuel particles in the mixed air are heated by the heat of 15 and evaporate to form a vaporized mixture, which can be discharged from the flame port 21 and easily oxidized and combusted by an appropriate means such as an electric ignition device.

On the other hand, coarse particles generated from the tip of the liquid column formed on the convergence horn 4 were dissipated toward the center of the combustion tube 15 by the jetting force, and were provided at the lower part of the combustion tube 15.

It adheres to the first vaporized body 18 and the second vaporized body 19 provided inside the combustion tube 15, and since the first and second vaporized bodies 18 and 19 are formed of foamed metal and have a capillary phenomenon, the attached coarse particles The particles are diffused, heated by the heat of the combustion tube 15 heated by the auxiliary heater 20, evaporated, and become a vaporized mixture, which is discharged from the flame port 21 and burned.

Furthermore, the combustion air supplied from the blower 11 into the fuel tank through the secondary combustion air branch pipe 23 that communicates the inside of the fuel tank 1 with the combustion chamber 22 is supplied to the combustion chamber 22 to promote combustion.

Further, when combustion is performed through the flame port 21, the combustion heat is transmitted to the combustion tube 15, and even if the heating by the auxiliary heater 20 is stopped, the combustion tube 15 is heated by the combustion heat, and the fuel oil is vaporized as described above. It is something that can be done.

In this way, according to the present invention, fuel oil particles atomized by the vibration energy generated by the vibrator are mixed with combustion air supplied from the blower, and heated by the combustion tube heated by the auxiliary heater. It evaporates and becomes a vaporized mixture, which is sent to the flame port and burned in the combustion chamber, increasing the combustion effect.

On the other hand, coarse particles that have not been completely atomized by the vibration energy adhere to the first vaporizer and the second vaporizer provided in the combustion tube due to the ejection force of the liquid column formed by the vibration energy, and are attached to the first vaporizer and the second vaporizer provided in the combustion tube, such as foamed metal etc. The first and second formed by
The attached coarse particles are dispersed due to the capillary action of the vapor,
Since the combustion tube is heated and vaporized by the heat of the combustion tube and sent to the flame port, the above-mentioned coarse particles that were not completely atomized by the vibration energy can also be attached by providing the combustion tube with a vaporizer protruding into the fuel tank. The effect is enhanced, and the adhered coarse particles are vaporized and combusted by the action described above, compared to conventional methods where coarse particles are not vaporized and fall into the original fuel tank due to their own weight. This contributes to the combustion of a large amount of fuel within a certain period of time, resulting in the effect of increasing combustion capacity.

Furthermore, when combustion occurs, combustion heat is transmitted to the combustion chamber and the combustion tube connected to the flame nozzle, heating the combustion tube, so even if heating by the auxiliary heater is stopped, the combustion tube is heated and the combustion oil is not vaporized. The use of auxiliary heaters improves initial performance and reduces indirect maintenance costs.

In addition, a convergence horn is provided to converge the vibration energy of the ultrasonic vibrator, increasing the vibration energy density near the convergence point of the convergence horn and increasing the atomization ability. There is no need to increase the output of the radio, and the generation of noise that affects radios etc. due to the increase in output can be prevented.

In addition, as the atomization ability improves, the ejection force increases, making it easier for coarse particles that have not been atomized to come into contact with the vaporized body.
Since the amount of oil in which coarse particles are not vaporized and falls into the original fuel oil is reduced, the amount of oil that contributes to combustion is large even if the output of the vibrator is the same, and the combustion effect is improved.

Further, since the combustion air supplied from the blower is also supplied to the combustion chamber through the secondary combustion branch pipe, effects such as further stabilization of combustion in the combustion chamber are brought about.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of an ultrasonic combustion device in an embodiment of the present invention. 1... Combustion tank, 4... Convergence horn, 7... Ultrasonic vibrator, 11... Blower, 15... Combustion cylinder , 17... through hole, 18, 19... vaporized body, 21... flame port.

Claims (1)

[Scope of Claims] 1. An atomization device that atomizes fuel oil in a fuel tank using an ultrasonic vibrator and a blower that supplies combustion air are provided to produce combustion air mixed with atomized fuel oil particles. In an ultrasonic combustion device that sends and burns through a flame port provided in a combustion tube, the lower part of the combustion tube is exposed to the inside of the fuel tank, and a vaporized material having a capillary effect such as a foamed metal is provided at the bottom of the combustion tube, An ultrasonic combustion device characterized in that a combustion cylinder is heated to vaporize oil particles adhering to the vaporized body and oil particles of mixed air passing through the combustion cylinder. 2. The combustion tube is provided so as to protrude into the fuel tank, and a plurality of through holes are provided in the side wall of the combustion tube. A vaporizer made of foamed metal or the like is provided inside the combustion tube, and the mixed air flowing through the through holes is absorbed into the vaporizer. 2. The ultrasonic combustion device according to claim 1, wherein the ultrasonic combustion device is characterized in that the ultrasonic combustion device is vaporized in a. 3. The ultrasonic combustion device according to claim 1, further comprising a convergence horn that converges the vibration energy of the ultrasonic vibrator. 4. The ultrasonic type according to claim 1, characterized in that a combustion chamber is provided in front of the flame port, and a part of the combustion air sent from the blower is supplied to the combustion chamber as secondary air. Combustion device.