WO2018159979A1 - Ultrasonic fuel supply apparatus, and internal combustion engine and combustion apparatus using same - Google Patents

Abstract

This ultrasonic fuel supply apparatus comprises: an ultrasonic fuel tank comprising a fuel storage space and an atomization space; an input pipe for supplying fuel from an external main fuel tank to the ultrasonic fuel tank; a flow rate control apparatus installed between the input pipe and the ultrasonic fuel tank and configured to maintain a set amount of fuel stored in the fuel storage space; at least one ultrasonic vibrator installed at the bottom of the ultrasonic fuel tank so as to atomize the fuel stored in the fuel storage space; an ultrasonic vibrator controller for driving the ultrasonic vibrator; and an output pipe for supplying the fuel, atomized by the ultrasonic vibrator, to a fuel injection apparatus.

Description

Ultrasonic fuel supply device and internal combustion engine and combustion device using same

The present invention relates to an ultrasonic fuel supply device, an internal combustion engine and a combustion device using the same.

Crude oil extracted from the ground is mainly a mixture of hydrocarbons and a mixture of various impurities such as sulfur. When the crude oil is heated and fractionally distilled, the boiling point (vaporization point) is evaporated and evaporated in descending order from the lowest material to the highest material.Gasoline, kerosene, diesel oil, heavy oil, etc. ) Can be obtained.

In general, diesel is about 10% higher in heat efficiency than gasoline and is mainly used as a fuel for diesel engine vehicles, but diesel contains sulfur, which emits sulfuric acid, which reacts with water vapor to produce sulfuric acid. May have harmful effects.

The fuel system of a general internal combustion engine is composed of a fuel pump for supplying fuel from a fuel tank and a mixing device for mixing a fuel and air (oxygen) supplied by the fuel pump at a predetermined ratio. Fuel is supplied from the fuel tank to the fuel filter by the fuel pump, and impurities are filtered out of the fuel filter and then supplied to the injection pump. The injection pump pressurizes the fuel and injects the fuel into the cylinder through the injection valve.

For example, since the fuel injected into the combustion chamber of a diesel engine has a smaller size of fuel particles, evaporation, better mixing with air, and the like, require atomization of the fuel with the smallest possible particle size.

Accordingly, Patent Documents 1 to 6 below disclose an apparatus for saving fuel and suppressing the generation of harmful exhaust gases by promoting complete combustion by applying ultrasonic energy to fuel and atomizing ultrasonic fuel using an ultrasonic vibrator to supply an injector through a compressor. Doing.

However, according to the disclosure of Patent Documents 1 to 6, in the conventional fuel injection device using ultrasonic waves, the fuel supplied from the fuel pump is used as the main fuel supply system, and the fuel supplied through the ultrasonic vibrator is used as the auxiliary fuel system, It only increases fuel efficiency by up to about 30%.

(Patent Document 1) Korean Patent Publication No. 1992-0010716

(Patent Document 2) Korean Patent Publication No. 1996-0012376

(Patent Document 3) Korean Utility Model Publication 20-1999-0041915

(Patent Document 4) Korean Unexamined Patent Publication 10-2001-0025533

(Patent Document 5) Korean Patent Publication 10-0840410

(Patent Document 6) Korean Unexamined Patent Publication 10-2012-0051462

For example, for diesel engines, to achieve greater fuel efficiency of about 30% or more, ultrasonic oscillators at constant speeds in normal speeds (e.g., about 3000 rpm or less) used in daily life or at these speeds It is necessary to use the atomized fuel as the main fuel supply system or to operate the engine only with the atomized fuel through the ultrasonic vibrator.

In addition, even in combustion devices such as boilers, heaters, and generators using kerosene, diesel, heavy oil, etc., the fuel atomized by the ultrasonic vibrator is used as the main fuel supply system to effectively reduce fuel and suppress generation of harmful emissions. It is necessary to drive the combustion apparatus using only fuel that has been used or atomized through ultrasonic vibrators.

According to at least one embodiment of the present invention for solving the above-mentioned problems, the internal combustion engine or the atomized fuel is atomized by using an ultrasonic vibrator, and the atomized fuel is used as the main fuel supply system or the fuel is atomized only by the ultrasonic vibrator. It is an object of the present invention to provide an ultrasonic fuel supply device capable of driving a combustion device.

In addition, according to at least one embodiment of the present invention, there is an object to provide an internal combustion engine and a combustion device using the ultrasonic fuel supply device as described above.

According to at least one embodiment of the present invention, an ultrasonic fuel tank including a fuel storage space and an atomization space, an input pipe for supplying fuel to an ultrasonic fuel tank from an external main fuel tank, between an input pipe and an ultrasonic fuel tank A flow control device installed to maintain a constant fuel storage amount of the fuel storage space, at least one ultrasonic vibrator installed at the bottom of the ultrasonic fuel tank to atomize the fuel stored in the fuel storage space, and ultrasonic waves for driving the ultrasonic vibrator An output pipe for supplying fuel atomized by the ultrasonic vibrator to the fuel injection device, and when the internal pressure decreases as the atomized fuel is supplied to the fuel injection device through the output pipe, air is introduced into the ultrasonic fuel tank. With an air inlet for injecting It provides acoustic fuel supply.

In at least one embodiment of the present invention, the internal combustion engine is configured to be driven using the atomized fuel supplied from the ultrasonic fuel supply device as a main fuel supply system in a rotational speed section which is used in daily use.

According to at least one embodiment of the present invention, a main fuel tank for storing fuel, a fuel pump connected to the main fuel tank for supplying fuel, an ultrasonic fuel supply device, and a fuel pump and an ultrasonic fuel supply device An internal combustion engine having a fuel injection device for supplying fuel to a cylinder chamber is provided.

According to at least one embodiment of the present invention, an ultrasonic fuel tank including a fuel storage space and an atomization space, an input pipe for supplying fuel to an ultrasonic fuel tank from an external main fuel tank, between an input pipe and an ultrasonic fuel tank A flow control device installed to maintain a constant fuel storage amount of the fuel storage space, at least one ultrasonic vibrator installed at the bottom of the ultrasonic fuel tank to atomize the fuel stored in the fuel storage space, and ultrasonic waves for driving the ultrasonic vibrator An ultrasonic fuel supply device having an oscillator controller and an output pipe for supplying fuel atomized by an ultrasonic vibrator to a fuel injection device.

According to at least one embodiment of the present invention, there is provided a main fuel tank for storing fuel, an ultrasonic fuel supply device, and a fuel injection device for supplying fuel supplied from the main fuel tank and the ultrasonic fuel supply device to a combustion chamber. Provide a combustion device.

In at least one embodiment of the invention, the combustion device is configured to be operable in the normal operating state, using the atomized fuel supplied from the ultrasonic fuel supply device as the main fuel supply system.

According to at least one embodiment of the present invention, an atomizer may be atomized using an ultrasonic vibrator to use the atomized fuel as a main fuel supply system or to drive an internal combustion engine or a combustion apparatus using only atomized fuel through an ultrasonic vibrator. There is an effect that can provide an ultrasonic fuel supply device.

In addition, according to at least one embodiment of the present invention, there is an effect that can provide an internal combustion engine and a combustion device using the ultrasonic fuel supply device as described above.

1 is a block diagram showing a configuration of an internal combustion engine according to at least one embodiment of the present invention.

2 is a conceptual diagram illustrating a structure of an ultrasonic fuel supply device according to at least one embodiment of the present invention.

3 is a conceptual diagram of a flow rate control valve configured to maintain a constant flow rate in the ultrasonic fuel tank of the ultrasonic fuel supply device according to at least one embodiment of the present invention.

4 is a conceptual view illustrating a flow rate adjusting device for maintaining a constant flow rate in an ultrasonic fuel tank of an ultrasonic fuel supply device according to at least one embodiment of the present invention, comprising an oil level gauge, a valve, and a valve controller.

FIG. 5 is a conceptual view illustrating a flow rate adjusting device for maintaining a constant flow rate in an ultrasonic fuel tank of an ultrasonic fuel supply device according to at least one embodiment of the present invention, including a fuel tank for controlling a flow rate, an oil gauge, a valve, and a valve controller .

6 is a conceptual diagram illustrating an operation of an air intake unit of the ultrasonic fuel supply device according to at least one embodiment of the present invention.

7 is a conceptual diagram illustrating an output pipe extension of the ultrasonic fuel supply device according to at least one embodiment of the present invention.

8 is a photograph of an ultrasonic fuel supply device manufactured for an experiment.

9 is a graph showing an example of an operation sequence of each fuel supply system of the internal combustion engine using the ultrasonic fuel supply device according to at least one embodiment of the present invention.

10 is a graph showing another example of an operation sequence of each fuel supply system of the internal combustion engine using the ultrasonic fuel supply device according to at least one embodiment of the present invention.

11 is a block diagram showing a configuration of a combustion apparatus according to at least one embodiment of the present invention.

12 is a conceptual diagram illustrating a structure of an ultrasonic fuel supply device according to at least one embodiment of the present invention.

Description of the symbols shown in the drawings is as follows.

10: main fuel tank 20: fuel pump

30: cylinder chamber 40: fuel injector

41: injection pump 42: injection nozzle

50: ultrasonic fuel supply device 51: ultrasonic fuel tank

52: input pipe 53: flow regulator

54: ultrasonic vibrator 55: ultrasonic vibrator controller

56: output pipe 57: air intake

58: diaphragm 60: valve

70: valve controller 511: wall surface

512: air inlet 513: fuel storage space

514: atomization space 531: valve

532: valve controller 533: oil gauge

534: fuel tank for flow control 535: oil gauge

536: connection pipe 561: output pipe extension

562: opening 563: high density region

564: opening 571: pin

572: Sucker 573: Spring

1110: main fuel tank 1130: cylinder chamber

1140: fuel injector 1150: ultrasonic fuel supply device

1160: valve 1170: valve controller

Hereinafter, an ultrasonic fuel supply device, an internal combustion engine and a combustion device using the same will be described with reference to the accompanying drawings.

In the present specification, a diesel engine using diesel as an internal combustion engine will be described as an example, but the present invention is not limited thereto, and all internal combustion engines and boilers using a fuel having a vaporization point of 150 degrees Celsius or more (eg, kerosene, diesel, heavy oil, etc.), Applicable to all combustion devices such as heaters and generators.

In addition, the present invention is the type of combustion chamber of the internal combustion engine (e.g., direct injection and indirect injection), the type of fuel injection pump (e.g. Inline Injection Pump, Distributor Pump It can be applied regardless of injection pump, unit injector and fuel injection method (eg mechanical injection and electronic injection).

1 is an example of an internal combustion engine according to at least one embodiment of the present invention, a block diagram showing the configuration of a diesel engine.

As shown in FIG. 1, an internal combustion engine according to at least one embodiment of the present invention is connected to a main fuel tank 10 for storing fuel and a fuel pump 20 for supplying fuel to the main fuel tank 10. ), A fuel injection device 40 for supplying the fuel supplied from the fuel pump 20 to the cylinder chamber 30, an ultrasonic fuel supply device 50 for atomizing the fuel and supplying the fuel in the atomized state, the fuel pump Located between the 20 and the fuel injection device 40 is composed of a valve 60 for opening and closing the fuel supply from the fuel pump 20, and a valve controller 70 for controlling the opening and closing of the valve 60 do.

In Fig. 1, only a fuel supply line is shown, not a fuel recovery line in a conventional diesel engine. Fuel stored in the main fuel tank 10 is pumped by the fuel pump 20 and atomized by the first fuel supply system and the ultrasonic fuel supply device 50 which are directly supplied to the fuel injection device 40 in a liquid state. It is supplied to the cylinder chamber 30 through the 2nd fuel supply system supplied to the fuel injection device 40 in a state.

In at least one embodiment of the present invention, the fuel supply through the second fuel supply system is always in the OPEN (opening degree 100%) state, while the fuel supply through the first fuel supply system is in an operating state of the internal combustion engine. Therefore, it is changed to OPEN (opening degree 100%), CLOSE (opening degree 0%), or partially OPEN (0% <opening degree <100%).

The fuel injection device 40 is composed of an injection pump 41 and an injection nozzle 42. The fuel supplied to the fuel injection device 40 through the first fuel supply system and / or the second fuel supply system is injected into the cylinder chamber 30 through the injection nozzle 42 by the injection pump 41. The fuel filter for removing impurities in the fuel and the mixer for mixing the injected air with the air sucked from the air cleaner at the time of fuel injection may use a conventional apparatus and structure, and thus the description thereof is omitted.

2 is a conceptual diagram illustrating a structure of an ultrasonic fuel supply device 50 according to at least one embodiment of the present invention.

As shown in FIG. 2, the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention includes an ultrasonic fuel tank 51 and a main fuel tank including a fuel storage space 513 and an atomization space 514. An input pipe 52 for supplying fuel to the ultrasonic fuel tank 51 through the fuel pump 20 through the fuel pump 20, and is installed between the input pipe 52 and the ultrasonic fuel tank 51 to provide fuel in the fuel storage space. Flow control device 53 for maintaining a constant storage amount, at least one ultrasonic vibrator 54, which is installed in the lower portion of the ultrasonic fuel tank 51 to atomize the fuel stored in the fuel storage space to drive the ultrasonic vibrator 54 The atomized fuel is injected through the ultrasonic vibrator controller 55, the output pipe 56 for supplying the fuel atomized by the ultrasonic vibrator 54 to the fuel injection device 40, and the output pipe 56. As supplied to the device 40 D. When the internal pressure is lowered, the air inlet 57 is opened to inject air into the ultrasonic fuel tank 51.

The diaphragm 58 is installed on the bottom surface of the ultrasonic fuel tank 51, and the ultrasonic vibrator 54 is attached to the rear surface of the diaphragm 58. The ultrasonic vibrator 54 may use a general piezoelectric ceramic. When a current flows through the ultrasonic vibrator 54, the diaphragm 58 vibrates, and ultrasonic waves are generated by this vibration to cause vibration in the fuel.

That is, when power is supplied to the ultrasonic vibrator 54 by the ultrasonic vibrator controller 55, the ultrasonic vibrator 54 vibrates from the bottom of the fuel. These vibrations cause the molecules of the fuel to collide with each other to transfer the vibrations between the molecules, and when the vibrations reach the surface of the fuel, the fuel particles on the fuel surface are released onto the fuel surface in the form of fine particles. Thus, if the core is too deep or too low, the fuel will not be atomized efficiently. In addition, in order to sufficiently secure the atomized fuel, the atomization space 514, which is about several times larger than the fuel storage space 513, is required.

As such, the ultrasonic vibrator 54 has a difference in atomization amount depending on the flow rate of the stored fuel (the oil level, that is, the height from the bottom to the oil level OL1), so it is necessary to maintain the flow rate of the fuel stored in the fuel storage space appropriately. . In general, in the case of an ultrasonic vibrator used in a humidifier or the like, an appropriate height from the bottom to the oil level OL1 is about 20 mm to 50 mm, and the amount of atomization is about 200 ml to 500 ml per hour.

3 is a conceptual diagram of a flow rate control valve 53 for maintaining a constant flow rate in the ultrasonic fuel tank 51 of the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention.

As shown in FIG. 3, in at least one embodiment of the present invention, the flow regulating device 53 includes a valve 531 for regulating the supply amount of fuel and a valve controller for regulating the opening amount of the valve 531. 532).

As described above, in order to obtain a sufficient atomization amount using the ultrasonic vibrator 54, it is necessary to maintain a proper height from the bottom to the oil level OL1. Therefore, in the present embodiment, the opening amount of the valve 531 is adjusted through the valve controller 532 so that the fuel is supplied from the fuel pump 20 by the amount of atomized fuel that is supplied to the cylinder chamber 30 and consumed. In at least one embodiment of the present invention, by manually operating the on / off switch mounted on the valve 531 without the valve controller 532, the fuel pump 20 is provided by the amount of atomized fuel supplied to the cylinder chamber 3. The valve 531 may be opened by about several mm to supply fuel to the ultrasonic fuel tank 51.

4 is a oil level gauge, a valve, and a valve controller of a flow control device 53 for maintaining a constant flow rate in the ultrasonic fuel tank 51 of the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention. It is a conceptual diagram composed of.

As shown in FIG. 4, in the present embodiment, the flow regulating device 53 includes a valve 531 for adjusting the supply amount of fuel, a valve controller 532 for adjusting the opening amount of the valve 531, and an oil level. It is comprised by the oil level meter 533 for detecting the height of OL1.

In the present embodiment, the oil level meter 533 detects the height (flow level) of the oil level OL1 indicating the amount of fuel in the ultrasonic fuel tank 51 and outputs the detection result to the valve controller 532. The valve controller 532 compares the height of the oil level OL1 detected by the oil level meter 533 with a preset value and controls the opening degree of the valve 531 according to the comparison result. That is, when it is determined that the height of the detected oil level OL1 is higher than the predetermined value by a predetermined value or more, the valve controller 532 closes the valve 531 to reduce the fuel supply to the ultrasonic fuel tank 51. Or block it. On the contrary, if it is determined that the height of the detected oil level OL1 is lower than the predetermined value by a predetermined value or more, the valve controller 532 opens the valve 531 to start supplying fuel to the ultrasonic fuel tank 51. Increase.

When the height of the oil level OL1 in the ultrasonic fuel tank 51 is detected by the oil level meter 533, the vibration of the ultrasonic vibrator 54 and the driving of the internal combustion engine (for example, according to at least one embodiment of the present invention) are performed. Due to vibrations caused by internal combustion engines (diesel engines, etc.), the height of the oil surface OL1 is randomly swung. Therefore, in at least one embodiment of the present invention, the oil level meter 533 divides the interval by time and takes the average value of the values detected in each interval and outputs the average value to the valve controller 532 as a detection result. On the contrary, in at least one embodiment of the present invention, the height of the oil level OL1 is randomly obtained by dividing the detection result received from the oil level meter 533 by the time interval and taking the average value for each time interval. The influence of the error due to rocking can be reduced.

5 is a flow rate control device 53 for maintaining a constant flow rate in the ultrasonic fuel tank 51 of the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention, the fuel tank, the oil gauge, It is a conceptual diagram comprised of a valve and a valve controller.

As shown in FIG. 5, in the present embodiment, the flow rate regulating device 53 includes a valve 531 for adjusting the supply amount of fuel, a valve controller 532 for adjusting the opening amount of the valve 531, and a flow control A fuel tank 534 and a oil level gauge 535 for detecting the height of the oil level OL1 in the fuel tank 534 for controlling the flow rate.

As described above, during driving of the internal combustion engine, driving of an automobile equipped with an oil level uplift caused by the vibration of the ultrasonic vibrator 54, for example, an internal combustion engine (diesel engine) according to at least one embodiment of the present invention. Due to the vibration caused by the back, the height of the oil surface OL1 is randomly swung. In FIG. 4, the flow rate of the ultrasonic fuel tank 51 was adjusted by taking an average value of the heights of the oil level OL1 detected using the oil level meter 533 for each section, but in this embodiment, a separate fuel tank for controlling flow rate 534. The flow rate in the ultrasonic fuel tank 51 is more efficiently controlled by using the?

As illustrated in FIG. 5, the flow rate control fuel tank 534 is connected to the ultrasonic fuel tank 51 and the connection pipe 536, so that the oil level OL1 of the fuel in the ultrasonic fuel tank 51 and the fuel tank for the flow rate control ( The oil level OL2 of the fuel in 534 is arranged to substantially coincide. Therefore, if the height of the oil level OL1 is changed due to the increase or decrease of the fuel in the ultrasonic fuel tank 51, the oil level OL2 in the flow rate control fuel tank 534 is also changed accordingly, so that the flow rate control fuel tank 534 is the same. The flow rate in the ultrasonic fuel tank 51 can be controlled by detecting the height of the oil level OL2 therein.

For example, the vibration of the ultrasonic vibrator 54 since the uprising of the oil surface OL1 due to the vibration of the ultrasonic vibrator 54 may be a greater obstacle in detecting the height of the oil surface than the rocking caused by driving of the vehicle. By using a separate flow control fuel tank 534 that is not affected by the there is an advantage that can control the flow rate in the ultrasonic fuel tank 51 more efficiently.

The oil level meter 535 detects the height of the oil level OL2 in the fuel tank 534 for flow control and outputs the detection result to the valve controller 532. The valve controller 532 compares the height of the oil level OL2 detected by the oil level meter 535 with a preset value and controls the opening degree of the valve 531 according to the comparison result. That is, when it is determined that the height of the detected oil level OL2 is higher than the predetermined value by a predetermined value or more, the valve controller 532 closes the valve 531 to reduce the fuel supply to the ultrasonic fuel tank 51. Or block it. On the contrary, if it is determined that the height of the detected oil level OL2 is lower than the predetermined value by a predetermined value or more, the valve controller 532 opens the valve 531 to start supplying fuel to the ultrasonic fuel tank 51. Increase.

Even in this case, in order to further improve accuracy, the oil level meter 535 divides the sections by time, takes the average value of the values detected in each section, and outputs the result to the valve controller 532 as the detection result, or the valve controller 532 receives the oil level meter. By dividing the detection result received from 535 by the time interval and taking the average value for each interval, the influence of the error due to the fluctuation of the oil level can be further reduced.

As the oil gauges 533 and 535 shown in FIGS. 4 and 5, an apparatus such as an oil gauge or a float switch can be used.

On the other hand, when the ultrasonic vibrator 54 is operated in a state where the bottom of the ultrasonic fuel tank 51 is exhausted for some reason, there is a fear that the adhesive part may be peeled off and cause a failure. In order to prevent this, in at least one embodiment of the present invention, the fuel level in the ultrasonic fuel tank 51 is exhausted by continuously monitoring the fuel amount of the ultrasonic fuel tank 51 using the oil level gauges 533 and 535. If it is determined, the ultrasonic vibrator controller 55 stops the operation of the ultrasonic vibrator 54. The ultrasonic vibrator controller 55 receives the monitor result from the oil level gauges 533 and 535 and determines that the fuel in the ultrasonic fuel tank 51 is exhausted when the received result is equal to or less than a predetermined amount. When this happens, the ultrasonic vibrator controller 55 outputs an alarm signal to cause the driver to eliminate the cause or the valve controller 532 immediately opens the valve 531 to supply fuel to the ultrasonic fuel tank 51. Outputs a signal to be supplied.

When driving an internal combustion engine (for example, a diesel engine) using the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention, the atomized fuel in the ultrasonic fuel supply device 50 according to the stroke of the combustion process. Is sucked into the cylinder chamber 30, the pressure in the ultrasonic fuel tank 51 becomes a vacuum state (low pressure state), the phenomenon that the wall of the ultrasonic fuel tank 51 is contracted inward. Therefore, even if atomized fuel in the fuel supply device 50 is sucked into the cylinder chamber 30, the inside of the ultrasonic fuel tank 51 does not become a vacuum state and the ultrasonic fuel tank as necessary to maintain a normal pressure (atmospheric pressure). It is necessary to inject air into the interior of 51.

6 is a conceptual diagram illustrating the operation of the air intake unit 57 of the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention.

As shown in FIG. 6, an air inlet 512 having a predetermined size is formed on the wall surface 511 of the ultrasonic fuel tank 51. The air intake part 57 is fitted into the pin 571 slidably inserted into the air inlet 512, the sucker 572 attached to the first end of the pin, and the pin 571 so as to fit the first of the pin 571. It is composed of a spring (elastic member) 573 positioned between the second end opposite the end and the sucker 572. The second end of the pin 571 is formed in the shape of a rivet head, through which the spring 573 is inserted into the pin 571 and the pin 571 through the air inlet 512 through the first end. Attaching the distal end and the sucker 572 allows the spring 573 to be contracted and stretched without falling between the second end of the fin 571 and the sucker 572.

At this time, the diameter of the air intake port 512 is set smaller than the diameters of the second ends of the spring 573 and the pin 571. In addition, the diameter of the air intake port 512 is such that the fin 571 freely travels inside the air intake port 512 and a predetermined space is formed between the pin 571 and the air intake port 512. It is set larger than the diameter of the pin 571 except the two ends. Accordingly, the pin 571 is inserted into the air inlet 512 while the spring 573 is inserted into the pin 571 through the first end, and then the pin 571 is slightly compressed. When the first end and the sucker 572 are attached, the sucker 572 is pulled toward the wall surface 511 due to the tensile force of the compressed spring 573, and is in close contact with the inner wall of the wall surface 511.

In a state where the pressure in the ultrasonic fuel tank 51 is a normal pressure above atmospheric pressure (normally, that is, atmospheric pressure), the air intake portion 57 is caused by the tension of the spring 573, as shown in Fig. 6 (a). The sucker 572 is in close contact with the inner wall of the wall surface 511 to seal the air inlet 512. Therefore, in this state, air cannot come and go through the air intake port 512.

When the atomized fuel in the ultrasonic fuel supply device 50 is sucked into the cylinder chamber 30 due to the drive of the internal combustion engine, and the pressure inside the ultrasonic fuel tank 51 becomes a vacuum (low pressure) state, As can be seen, the wall surface 511 of the ultrasonic fuel tank 51 is contracted inward by external pressure.

In this state, when the pressure inside the ultrasonic fuel tank 51 is lowered and the pulling force of the sucker 572 exceeds the elastic force of the spring 573, as shown in FIG. 6 (c), the sucker 572 is inward. The air is injected into the ultrasonic fuel tank 51 in the direction of the arrow through the space between the air inlet 512 and the pin 571. When the internal pressure of the ultrasonic fuel tank 51 is returned to the normal pressure due to the injection of air, the sucker 572 is pulled toward the wall surface 511 due to the elastic force of the spring 573 so that the wall surface 511 of the ultrasonic fuel tank 51 is pulled. Since it is in close contact with the inner wall of the air is no longer injected into the ultrasonic fuel tank (51).

In the exemplary embodiment of the present specification, the spring 573 is used as an elastic member for providing an elastic force. However, the present invention is not limited thereto, and an elastic material may be used as a elastic member or a solenoid using a material such as rubber or silicone having elastic force. It can also function as a member.

In the embodiment of the present specification, the wall surface 511 is described as the side wall surface of the ultrasonic fuel tank 51, but the present invention is not limited thereto, and may be a ceiling surface or a bottom surface of the ultrasonic fuel tank 51.

BACKGROUND ART A technique for atomizing a liquid by ultrasonic waves is widely used in humidifiers, aspirators, and the like. In the case of a humidifier, when a piezoceramic vibrator is installed at the bottom of a tank and high frequency AC voltage is applied thereto, ultrasonic vibration energy generated is transferred to the surface, and a part of the surface is raised under specific conditions to generate fine particles therefrom.

In the atomization apparatus using ultrasonic waves, the resonant frequency of the vibrator and the water depth (depth of the liquid in which the vibrator is immersed) greatly influence the amount of atomization. For example, even at the same frequency, atomization may or may not occur depending on depth. Accordingly, in the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention, the flow depth of the fuel in the ultrasonic fuel tank 51 is adjusted within a predetermined range by using the flow regulating device 53. Keep the depth constant.

A piezoelectric vibrator is a device in which metal electrodes are formed on both surfaces of a piezoelectric ceramic plate, and functions as an ultrasonic vibrator when a high frequency voltage is applied from a driving circuit. As a result, the generated vibration energy concentrates on the oil surface to form the fuel column, and the fine particles of the fuel are diverted from the tip of the fuel column whose surface tension is greatly reduced. In this case, the fuel pillar is formed in the vertical direction immediately above the ultrasonic vibrator, and the discharged particles are concentrated in the vertical direction directly above the formed fuel pillar to form a high density region of the atomized fuel (see FIG. 7). Therefore, the distal end portion of the output pipe 56 connected to the ultrasonic fuel tank 51 can be located in the high density region of the atomized fuel inside the ultrasonic fuel tank 51 so that the supply of atomized fuel can be made more efficient.

7 is a conceptual diagram illustrating an output pipe extension of the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention.

As shown in FIG. 7A, the output pipe 56 of the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention may include an output pipe extension extending into the ultrasonic fuel tank 51. 561). An opening 562 is formed at the end of the output pipe extension 561 to set the length of the output pipe extension 561 such that the opening 562 is located in the high density region (eg, the center) of the atomized fuel. do.

In FIG. 7B, a funnel-shaped opening 564 is shown in which the distal end of the output pipe extension 561 is flared. By taking this structure, the atomized fuel can be supplied to the cylinder chamber 30 more efficiently by increasing the area of the suction portion of the output pipe 56 even in the high density region 563 of the atomized fuel.

In fact, the ultrasonic fuel supply device 50 was manufactured and applied to a diesel engine of an automobile. As a result, the fuel atomized by the ultrasonic vibrator during constant speed driving at a rotational speed section (about 3000 rpm or less) used in daily life or at this rotational speed section It was confirmed that only the engine can be driven.

First, an ultrasonic fuel tank 51 was manufactured using plastic containers having widths, heights, and depths of 14 cm, 18 cm, and 9 cm, respectively. As the ultrasonic vibrator 54, a humidifier vibrator and controller of TDK product having an atomization amount of about 200 ml per hour and a particle size of about 3 to 4 mm were used. In the flow control device 53, the valve shown in FIG. 3 is formed of only the valve except the valve controller, and the valve opening is fixed at about 1 mm to 2 mm so that the height (flow level) from the bottom to the oil surface in the container is about 20. It was kept constant at about mm. A total of four ultrasonic vibrators were installed on the bottom of the plastic container, and the number of movable parts was adjusted as needed.

8 is an actual picture of the ultrasonic fuel supply device 50 manufactured as described above.

The produced ultrasonic fuel supply device 50 was applied to an engine of a 1993 Hyundai Galloper, and an engine driving test was conducted. The Galloper is an SUV with a 2.5-litre (2,476cc exhaust) diesel engine, a four-wheel drive vehicle with a five-speed manual transmission. The engine type is D4BX with diesel as fuel, with peak power of 73 / 4,200 ps / rpm, maximum torque of 14,9 / 2,500 kg * m / rpm and fuel economy of 17.3 km / l.

The fuel supply pipe connecting the fuel pump and the injection pump of the galloper is cut and connected to the input pipe 52 of the ultrasonic fuel supply device 50, in which the pipe on the fuel pump side is manufactured, and the pipe on the injection pump side is connected to the output pipe ( 56, the fuel is injected into the ultrasonic fuel tank 51 so that the oil level is about 25 mm, and the ultrasonic vibrator 54 is vibrated through the ultrasonic vibrator controller 55 to make the ultrasonic fuel tank ( After the atomization in 51) was started, the engine was started and the accelerator was operated to change the engine speed in various ways.

As a result of the experiment, two ultrasonic vibrators were used to atomize less than about 400 ml of fuel per hour, and the fuel supplied to the fuel injection device 40 was directly supplied from the main fuel tank 10 to the fuel injection device 40 through the fuel pump 20. 1 Without using a fuel supply system, using only the second fuel supply system supplied to the fuel injection device 40 in an atomized state by the ultrasonic fuel supply device 50, the engine speed is arbitrarily changed within 3,000 rpm. The engine could run for one hour. When the accelerator was controlled to exceed 3,000 rpm, the engine operated abnormally, but it was confirmed that the engine operated without any problem in the RPM section below 3,000 rpm.

Even when starting the engine, when the engine was normally stopped, it was possible to start the engine using only the second fuel supply system without using the first fuel supply system. However, when the engine is abnormally stopped in the high rotational region when driven using only the ultrasonic fuel supply system, it is difficult to start using only the ultrasonic fuel supply system. This may be the reason that a predetermined amount of fuel remains in the fuel injection system when the engine stops normally, but the fuel density for starting is insufficient when the engine stops abnormally.

Therefore, when the engine is started, the use of the second fuel supply system and the first fuel supply system together can solve this problem. To this end, in the internal combustion engine using the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention, as shown in FIG. 1, the fuel pump is located between the fuel pump 20 and the fuel injection device 40. A valve 60 for opening and closing the fuel supply from the 20 and a valve controller 70 for controlling the opening and closing of the valve 60 are provided.

Experiments were conducted on diesel engines using injection pumps, but for diesel engines using modern high pressure pumps, it is necessary to compensate for the pressure drop due to the supply of atomized (gas) fuel. That is, it is necessary to control the driving of the high pressure pump to compensate for the pressure difference due to the gaseous fuel supply through the controller of the high pressure pump.

9 is a graph showing an example of an operating sequence of each fuel supply system of the internal combustion engine using the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention.

As shown in FIG. 9, the ratio (%) of the opening degree of a 1st fuel supply system and the opening degree of a 2nd fuel supply system at the time of engine start is 100: 100, and this ratio is maintained until predetermined time t1 passes. do. The predetermined time t1 can be arbitrarily set within a range of about several tens of seconds to several minutes. Afterwards, in the engine speed range (for example, about 700 rpm to 3,000 rpm) that starts to be used everyday, the valve controller 70 closes the valve 60 to open the first fuel supply system and supply the second fuel. By setting the percentage of opening of the system to 0: 100, the engine is driven only with atomized fuel supplied from the ultrasonic fuel supply device. When the engine speed is increased to a high rotational section of about 3,000 rpm or more while driving (for example, during a rapid acceleration, a slope plate, or at a high speed in which the engine speed exceeds 3,000 rpm, etc.), the valve controller 70 generates a valve ( 60) to open the first fuel supply system to the cylinder chamber 30 by setting the ratio (%) of the opening of the second fuel supply system to 100: 100 or x: 100 (0 <x <100). This prevents abnormal operation of the engine due to the reduced density of fuel.

9 shows an example in which the ratio (%) between the opening of the first fuel supply system and the opening of the second fuel supply system is set to 100: 100 when the engine is started, but this is merely an example. As long as there is no problem in starting the engine, this ratio can be set arbitrarily. For example, a ratio of 100: x (0 * x * 100) may be realized by controlling the driving of the ultrasonic vibrator 54 by the ultrasonic vibrator controller 55.

10 is a graph showing another example of an operation sequence of each fuel supply system of the internal combustion engine using the ultrasonic fuel supply device 50 according to at least one embodiment of the present invention. Figure 10 shows the change in the opening degree of the main fuel supply system and the ultrasonic fuel supply system according to the change in the engine speed.

When the engine speed changes as shown in FIG. 10 (a), the opening degree of the main fuel supply system changes as shown in FIG. 10 (b). That is, in the rotational speed section that is mainly used in daily life when the engine speed is about 3,000 rpm or less, the valve 60 is closed to maintain an opening degree of 0%, and the high rotational speed section at which the engine speed is about 3,000 rpm or more (for example, In case of rapid acceleration, slope climbing, or high speed driving with more than 3,000 rpm, the valve 60 can be opened and maintained at 100% opening or adjusted to any opening between 0% and 100%. .

The opening degree of the ultrasonic fuel supply system is always maintained at 100%, as shown in FIG. Even if the ultrasonic fuel supply system is always operated at 100%, the atomized liquid does not increase indefinitely because the atomized fuel in the atomization space 514 is reduced back to the liquid. This will dramatically increase fuel economy and reduce hazardous emissions by using atomized fuel from the ultrasonic fuel supply system as the main fuel supply system or by running the engine with only atomized fuel in the rotational speed range that is used in daily life. Can be.

In at least one embodiment of the present invention, using the atomized fuel supplied from the ultrasonic fuel supply device 50 as the main fuel supply system is to supply the fuel supplied through the fuel pump 20 (the first fuel supply system). ) Ratio is 49% or less of the total fuel supply, and the ratio of the supply (second fuel supply system) of the atomized fuel through the ultrasonic fuel supply device 50 is 51% or more of the total fuel supply.

In another embodiment of the present invention, using the atomized fuel supplied from the ultrasonic fuel supply device 50 as the main fuel supply system is the supply of fuel supplied through the fuel pump 20 (first fuel supply system) It means that the ratio is 19% or less of the total fuel supply and the ratio of the supply of fuel (second fuel supply system) atomized through the ultrasonic fuel supply device 50 is 81% or more of the total fuel supply.

In another embodiment of the present invention, driving the engine with only atomized fuel supplied from the ultrasonic fuel supply device 50 cuts off the supply of fuel supplied through the fuel pump 20 (first fuel supply system). (0%) means supplying only 100% of the total fuel supply to the atomized fuel (second fuel supply system) through the ultrasonic fuel supply device 50.

In the embodiment of the present disclosure, according to at least one embodiment of the present invention, the ultrasonic fuel supply device and the internal combustion engine using the same have been described using a diesel engine as an example, but the present invention is not limited thereto. For example, kerosene, diesel Applicable to all internal combustion engines and combustion systems using heavy oil or heavy oil. In the case of an internal combustion engine or a combustion apparatus having a specific starting mechanism, only the second fuel supply system may be used without starting the first fuel supply system.

In addition, in the embodiment of the present specification, the high-speed section of the engine speed has been described as about 3,000 rpm or more, but this value may vary depending on the type and specification of the engine in the technical field to which at least one embodiment according to the present invention belongs. Those of ordinary skill will understand.

In addition, various controllers for controlling various valves and ultrasonic vibrators may be provided independently or may be integrated and operated in an electronic control device such as an engine control unit (ECU) or an engine control module (ECM). . In either case, the various controllers may operate independently or under the control of an ECU or an ECM.

11 is a block diagram showing a configuration of a combustion apparatus according to at least one embodiment of the present invention.

As shown in FIG. 11, a combustion apparatus according to at least one embodiment of the present invention supplies a fuel supplied from a main fuel tank 1110 and a main fuel tank 1110 to store fuel to the combustion chamber 1130. Fuel injection device 1140, an ultrasonic fuel supply device 1150 for atomizing the fuel and atomizing the fuel, and is located between the main fuel tank 1110 and the fuel injection device 1140 and the main fuel tank 1110 A valve 1160 for opening and closing the fuel supply from the valve, and a valve controller 1170 for controlling the opening and closing of the valve 1160.

A pump or blower for sending fuel from the main fuel tank 1110 to the combustion chamber 1130 or from the ultrasonic fuel supply device 1150 to the combustion chamber 1130 may be installed in an appropriate position as needed, which is in accordance with the present invention. As those skilled in the art to which at least one embodiment belongs, various modifications and changes may be made without departing from the essential characteristics of the present embodiment, and thus descriptions thereof will be omitted.

Similar to the internal combustion engine, in the combustion apparatus, the fuel stored in the main fuel tank 1110 is atomized by the first fuel supply system and the ultrasonic fuel supply apparatus 1150 supplied directly to the fuel injection apparatus 1140 in a liquid state. Is supplied to the cylinder chamber 1130 through the second fuel supply system which is supplied to the fuel injection device 1140.

12 is a conceptual diagram illustrating a structure of an ultrasonic fuel supply device 1150 according to at least one embodiment of the present invention.

The difference between the ultrasonic fuel supply device 1150 shown in FIG. 12 and the ultrasonic fuel supply device 50 shown in FIG. 2 is that an air inlet for injecting air into the ultrasonic fuel tank 51 in the case of a combustion device. (57) is not necessary. Except for the air inlet 57, the ultrasonic fuel supply device 1150 may be regarded as the same as the ultrasonic fuel supply device 50. For a detailed description thereof, the ultrasonic fuel supply device 50 except for the air inlet 57 is described. See the description of).

The ultrasonic fuel supply device 1150 for the combustion device may further include an air suction unit 57. In the case of the internal combustion engine, the air intake unit 57 is required due to the vacuum due to the cylinder action, but in the case of the combustion engine, the air intake unit 57 may be provided if there is a concern that a decrease in internal pressure due to combustion may occur. However, in the conventional combustion apparatus, there is no need for the air intake unit 57.

Unlike the internal combustion engine, the combustion device dramatically improves combustion efficiency by using atomized fuel supplied from the ultrasonic fuel supply unit as a main fuel supply system or operating the device using only atomized fuel from start-up to normal operation. It can reduce the emission of harmful substances.

In at least one embodiment of the present invention, using the atomized fuel supplied from the ultrasonic fuel supply device 1150 as the main fuel supply system may include supplying the fuel supplied from the main fuel tank 1110 (first fuel supply system). ) Ratio is 49% or less of the total fuel supply, and the ratio of the supply (second fuel supply system) of the atomized fuel through the ultrasonic fuel supply device 1150 is 51% or more of the total fuel supply.

In another embodiment of the present invention, using the atomized fuel supplied from the ultrasonic fuel supply device 1150 as the main fuel supply system is to supply the fuel supplied from the main fuel tank 1110 (first fuel supply system). This means that the ratio is 19% or less of the total fuel supply and the ratio of the supply of fuel (second fuel supply system) atomized through the ultrasonic fuel supply device 1150 is 81% or more of the total fuel supply.

In another embodiment of the present invention, operating the combustion device only with atomized fuel supplied from the ultrasonic fuel supply device 1150 blocks supply of fuel (first fuel supply system) supplied from the main fuel tank 1110. (0%) to supply only 100% of the total fuel supply to the atomized fuel (second fuel supply system) through the ultrasonic fuel supply device 1150.

In at least one embodiment of the present invention, the combustion device may be configured to include a valve controller (a) when the atomized fuel is not properly supplied due to a failure of the ultrasonic fuel supply device 1150 during operation through the second fuel supply system in normal operation. And a safety device (not shown) for opening the valve 1160 through 1170 to allow fuel to be supplied from the main fuel tank 1110.

In at least one embodiment of the present invention, the combustion apparatus further includes a switching device (not shown) including a plurality of ultrasonic fuel supply devices 1150 and capable of switching the ultrasonic fuel supply device 1150 in the event of a failure. .

As described above, according to at least one embodiment of the present invention, the internal combustion engine and the combustion using only the fuel atomized by using the ultrasonic vibrator and atomized fuel as the main fuel supply system or by atomizing the fuel through the ultrasonic vibrator An ultrasonic fuel supply device capable of driving the device can be provided.

In addition, according to at least one embodiment of the present invention, by providing an ultrasonic fuel supply device as described above, by providing an internal combustion engine and a combustion device, it is possible to significantly increase fuel efficiency and thereby reduce various emissions of harmful substances.

The above description is merely illustrative of the technical spirit of at least one embodiment according to the present invention, and those skilled in the art to which at least one embodiment of the present invention belongs will not depart from the essential characteristics of the present embodiment. Many modifications and variations are possible without departing from the scope of the invention. Accordingly, the embodiments according to the present invention are not intended to limit the technical idea of the present embodiment but to describe the present invention, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The protection scope of at least one embodiment according to the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of rights of at least one embodiment according to the present invention. will be.

Claims (22)

1. An ultrasonic fuel tank including a fuel storage space and an atomization space;

   An input pipe for supplying fuel from an external main fuel tank to the ultrasonic fuel tank;

   A flow rate adjusting device installed between the input pipe and the ultrasonic fuel tank and configured to maintain a constant fuel storage amount of the fuel storage space;

   At least one ultrasonic vibrator installed under the ultrasonic fuel tank to atomize the fuel stored in the fuel storage space;

   An ultrasonic vibrator controller for driving the ultrasonic vibrator;

   An output pipe for supplying the fuel atomized by the ultrasonic vibrator to a fuel injection device; And

   Air inlet for injecting air into the ultrasonic fuel tank is opened when the internal pressure is lowered as the atomized fuel is supplied to the fuel injection device through the output pipe

   Ultrasonic fuel supply device having a.
2. The method of claim 1,

   The flow rate adjusting device may be configured to adjust the flow rate according to a level gauge for detecting a level of the fuel stored in the fuel storage space, a flow rate regulating valve provided between the input pipe and the ultrasonic fuel tank, and a level level detected by the level gauge. Ultrasonic fuel supply device comprising a valve controller for adjusting the opening amount of the valve.
3. The method of claim 1,

   The flow rate adjusting device may include a flow rate control fuel tank connected between the input pipe and the ultrasonic fuel tank and configured to maintain a flow level equal to that of the ultrasonic fuel tank, a level gauge for detecting a flow level of the flow control fuel tank; And a valve installed between the input pipe and the fuel tank for controlling the flow rate, and a valve controller for adjusting the opening amount of the valve according to the oil level detected by the oil level gauge.
4. The method of claim 1,

   The air intake unit may include an air intake formed on a wall of the ultrasonic fuel tank, a sucker for sealing the air intake in the ultrasonic fuel tank, and an elastic member providing an elastic force to seal the air intake. When the pressure in the ultrasonic fuel tank is a normal pressure, the sucker closes the suction port by the elastic force of the elastic member, and the pressure in the ultrasonic fuel tank drops below the normal pressure so that the internal shrinkage force of the elastic member is reduced. And when the elastic force is exceeded, the sucker is pulled to open the air inlet.
5. The method of claim 1,

   And an output pipe extension portion extending from the output pipe into the ultrasonic fuel tank and having an opening in the high density region of the atomized fuel.
6. The method of claim 5,

   The output pipe extension, the ultrasonic fuel supply device formed in a funnel shape, the opening is flared.
7. A main fuel tank for storing fuel;

   A fuel pump connected to the main fuel tank to supply fuel;

   Ultrasonic fuel supply device according to any one of claims 1 to 6; And

   A fuel injection device for supplying fuel supplied from the fuel pump and the ultrasonic fuel supply device to a cylinder chamber;

   Internal combustion engine having a.
8. The method of claim 7, wherein

   An internal combustion engine which can be driven by using atomized fuel supplied from the ultrasonic fuel supply device as a main fuel supply system at a rotational speed section which is used daily.
9. The method of claim 8,

   In the main fuel supply system, the supply ratio of fuel supplied through the fuel pump is 49% or less of the total fuel supply and the supply ratio of atomized fuel supplied from the ultrasonic fuel supply device is 51% or more of the total fuel supply. Internal combustion engine.
10. The method of claim 8,

    In the main fuel supply system, the supply ratio of fuel supplied through the fuel pump is 19% or less of the total fuel supply, and the supply ratio of atomized fuel supplied from the ultrasonic fuel supply device is 81% or more of the total fuel supply. Internal combustion engine.
11. The method of claim 8,

    An internal combustion engine that can be driven only with atomized fuel supplied from the ultrasonic fuel supply device in a rotational speed section that is commonly used.
12. An ultrasonic fuel tank including a fuel storage space and an atomization space;

    An input pipe for supplying fuel from an external main fuel tank to the ultrasonic fuel tank;

    A flow rate adjusting device installed between the input pipe and the ultrasonic fuel tank and configured to maintain a constant fuel storage amount of the fuel storage space;

    At least one ultrasonic vibrator installed under the ultrasonic fuel tank to atomize the fuel stored in the fuel storage space;

    An ultrasonic vibrator controller for driving the ultrasonic vibrator; And

    An output pipe for supplying the fuel atomized by the ultrasonic vibrator to a fuel injection device;

    Ultrasonic fuel supply device having a.
13. The method of claim 12,

    The flow rate adjusting device may be configured to adjust the flow rate according to a level gauge for detecting a level of the fuel stored in the fuel storage space, a flow rate regulating valve provided between the input pipe and the ultrasonic fuel tank, and a level level detected by the level gauge. Ultrasonic fuel supply device comprising a valve controller for adjusting the opening amount of the valve.
14. The method of claim 12,

    The flow rate adjusting device may include a flow rate control fuel tank connected between the input pipe and the ultrasonic fuel tank and configured to maintain a flow level equal to that of the ultrasonic fuel tank, a level gauge for detecting a flow level of the flow control fuel tank; And a valve installed between the input pipe and the fuel tank for controlling the flow rate, and a valve controller for adjusting the opening amount of the valve according to the oil level detected by the oil level gauge.
15. The method of claim 12,

    Further provided with an air inlet for opening the air into the ultrasonic fuel tank when the internal pressure is lowered as the atomized fuel is supplied to the fuel injection device through the output pipe,

    The air intake unit may include an air intake formed on a wall of the ultrasonic fuel tank, a sucker for sealing the air intake in the ultrasonic fuel tank, and an elastic member providing an elastic force to seal the air intake. When the pressure in the ultrasonic fuel tank is a normal pressure, the sucker closes the suction port by the elastic force of the elastic member, and the pressure in the ultrasonic fuel tank drops below the normal pressure so that the internal shrinkage force of the elastic member is reduced. And when the elastic force is exceeded, the sucker is pulled to open the air inlet.
16. The method of claim 12,

    And an output pipe extension portion extending from the output pipe into the ultrasonic fuel tank and having an opening in the high density region of the atomized fuel.
17. The method of claim 16,

    The output pipe extension, the ultrasonic fuel supply device formed in a funnel shape, the opening is flared.
18. A main fuel tank for storing fuel;

    An ultrasonic fuel supply device according to any one of claims 12 to 17; And

    A fuel injection device for supplying fuel supplied from the main fuel tank and the ultrasonic fuel supply device to a combustion chamber;

    Combustion apparatus having a.
19. The method of claim 18,

    And a combustion apparatus operable by using atomized fuel supplied from the ultrasonic fuel supply device as a main fuel supply system in a normal operation state.
20. The method of claim 19,

    In the main fuel supply system, the supply ratio of fuel supplied from the main fuel tank is 49% or less of the total fuel supply, and the supply ratio of atomized fuel supplied from the ultrasonic fuel supply device is 51% or more of the total fuel supply. Combustion device.
21. The method of claim 19,

    In the main fuel supply system, the supply ratio of fuel supplied from the main fuel tank is 19% or less of the total fuel supply, and the supply ratio of atomized fuel supplied from the ultrasonic fuel supply device is 81% or more of the total fuel supply. Combustion device.
22. The method of claim 19,

    A combustion apparatus operable with only atomized fuel supplied from the ultrasonic fuel supply apparatus in a normal operating state.

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