JPH0332764A - Ultrasonic atomizing device - Google Patents

Abstract

PURPOSE:To always atomize a liquid matter uniformly by forming a slit all over the periphery between a plate and a vibrator phone and displacing the clearance of the slit with the liquid pressure even when the supplying amount of liquid is fluctuated. CONSTITUTION:An ultrasonic wave generating means 3 is fitted around the outer periphery of a vibrator main body 2, and the vibrator phone 4 is fixed at the top end of the vibrator main body 2, and a liquid supply passage 6 is formed in the main body 2. A passage enlarging part 4a the diameter of which is enlarged as it goes to the top end is provided in the vibrator phone 4, and a hollow part 4b is formed in the passage enlarging part 4a. The plate 7 is provided at the top end of the main body 2, and the slit 9 is formed all over the periphery between the plate 7 and the vibrator phone 4, and the slit 9 is communicated with the liquid supply passage 6 by spouting holes 10. As a result, a suitable film thickness is always maintained in the spraying surface even when the supplying amount of liquid matter is fluctuated, so that the uniform atomization of liquid matter is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention generally relates to a liquid substance such as a liquid fuel (in this specification, a liquid substance refers to a liquid such as a liquid fuel, but also a liquid substance such as a liquid fuel). The ultrasonic atomizer is used to atomize liquids (including liquids such as turbid solutions) using ultrasonic vibration, and is particularly applicable to (1) automobiles, outboard motors, portable power devices, Ultrasonic atomizers applied to internal combustion engines used in the drive devices of consumer heat pump devices, etc.; (2) fuel injection nozzles for gas turbines; (3) boilers and heating furnaces for industrial, commercial and domestic use; Heating burner, (4)
Industrial liquid sprayers, such as drying sprayers for drying liquid materials such as foods, medicines, agricultural chemicals, fertilizers, etc., temperature control, yt
! 4 Wet spray, sprayer for baked powder (ceramic granulation),
The present invention relates to an ultrasonic atomization device suitably used in a spray coating device, a reaction accelerator, and (5) a non-industrial liquid sprayer, such as an agricultural chemical sprayer, a disinfectant sprayer, and the like.

[Conventional technology]

Until now, in internal combustion engines such as gasoline engines and diesel engines, or external combustion engines such as boilers B and fan heaters, when burning the supplied liquid fuel, from the viewpoint of combustion performance, the liquid fuel It is desirable to atomize and supply fuel into extremely small droplet sizes. In particular, in internal combustion engines such as gasoline engines and diesel engines, in order to obtain favorable engine performance, the liquid substance injected into the intake pipe, that is, the liquid fuel, is atomized into extremely small droplet sizes and mixed with air. It is necessary to supply the combustion chamber of the engine with

BACKGROUND ART Conventionally, an ultrasonic atomization device that atomizes supplied liquid fuel using ultrasonic waves is known as such a device that atomizes liquid fuel into extremely small droplet size. especially,
At this time, if the liquid fuel is required to be atomized over a wide flow rate range (high turndown) such as in a gasoline engine, a solenoid valve is used as the liquid fuel supply means, and an ultrasonic atomizer is used as the liquid fuel supply means. A method is adopted in which liquid fuel is supplied directly to the atomization surface of the atomization device.

In this type of ultrasonic atomizer, it is essential to form a thin film of liquid on the atomization surface in order to ensure good atomization efficiency over a wide fuel supply range. For this purpose, so far 8! Various efforts have been made.

FIG. 3 shows an ultrasonic atomizer that supplies liquid to the atomization surface from a plurality of holes, including a cylinder 01 and a nozzle body 102.
, a vibrator horn 103, and an electric/acoustic conversion element 104, a fuel supply passage 105 is formed in the cylinder 101, and an injection hole 106 communicating with the fuel supply passage 105 is formed in the nozzle body 102. . A plurality of injection holes 106 are formed on the circumference of the nozzle body 102.
The fuel injected from the vibrator horn 103 is supplied to the vibrator horn 103 to atomize the fuel.

Further, FIG. 1 shows a type of ultrasonic atomizer that supplies liquid to the entire circumference of the atomization surface, and includes an outer cylinder 111,
Inner cylinder 112, vibrator horn 113, electric
Consisting of an acoustic transducer 114, an outer cylinder 111
A fuel supply passage 115 is formed between the outer cylinder 111 and the inner cylinder 112, and fuel is supplied from the entire circumference of the outer cylinder 111 to the vibrator horn 113 to atomize the fuel.

[Problem that the invention seeks to solve]

However, in the above conventional ultrasonic atomization device,
In either case, since a cylinder for supplying fuel is provided around the outer periphery of the vibrator horn, there is a problem in that the device becomes larger and heavier.

In addition, when the above-mentioned ultrasonic atomization device is applied to an internal combustion engine, the required fuel can be produced in large quantities in a short time with a fine atomized particle size suitable for combustion, depending on the load fluctuation of the internal combustion engine. Difficult to atomize effectively and efficiently. That is, it is difficult to obtain sufficient amplitude needed to atomize a large amount of liquid. This is because the above-mentioned vibrator horn is a solid type, has a large mass, and if a high amplitude is to be ensured, high stress is generated and the material is not durable.

Another disadvantage is that the power consumption required to atomize the fuel supplied using this device is high. This is because the ultrasonic energy generated from the ultrasonic vibration generating means vibrates the ultrasonic vibrator horn, and the vibration of the ultrasonic vibrator horn causes the supplied fuel to be atomized at the atomization part of the ultrasonic vibrator horn. When atomizing fuel with a solid ultrasonic transducer horn with a large mass, a large amount of ultrasonic energy is required to obtain a large amplitude, and therefore a large amount of fuel cannot be atomized. To do that,
A large amount of energy is required, resulting in stress on the horn that is too high to atomize large amounts of fuel efficiently.

An object of the present invention is to provide an ultrasonic atomization device that can efficiently atomize a large amount of liquid substance in a short period of time in response to load fluctuations in, for example, an internal combustion engine.

Another object of the present invention is that even if the supply amount of liquid substance fluctuates,
It is an object of the present invention to provide an ultrasonic atomizer capable of uniformly atomizing a liquid substance by always maintaining an appropriate film thickness on an atomizing surface.

[Means for Solving the Problems] For this purpose, the ultrasonic atomization device of the present invention includes a vibrator body 2, an ultrasonic vibration generating means 3 fitted to the outer periphery of the vibrator body, and a vibrator body 2. Vibrator horn 4 fixed to the tip of
and a liquid supply path 6 formed inside the vibrator body 2.
The vibrator horn 4 has an enlarged diameter part 4a whose diameter becomes larger toward the tip, and a hollow part 4b is formed in the enlarged diameter part, and the tip of the vibrator body 2 has an enlarged diameter part 4a. ,
A plate 7 having a curved surface shape is formed, and a slit 9 is formed over the entire circumference between the plate 7 and the vibrator horn 4, and the slit 9 and the liquid supply path 6 communicate with each other through an injection hole 10. It is characterized by

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, the liquid supplied from the liquid supply path 6 passes through the injection hole 10 and is uniformly distributed over the entire circumference of the slit 9, and the amount of liquid supplied is controlled. Even if the liquid pressure fluctuates, the clearance of the slit 9 is displaced by the liquid pressure, and an appropriate film thickness is always maintained on the atomization surface, making it possible to uniformly atomize the liquid substance.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure is a sectional view showing an embodiment of the ultrasonic atomization device of the present invention.

In FIG. 1, an ultrasonic atomization device 1 includes a vibrator main body 2,
It consists of an ultrasonic vibration generator 3 that is fitted on the outer periphery of the ultrasonic vibration generating section 3 for generating ultrasonic vibrations, and a vibrator horn 4 that is fixed to the tip of the vibrator body 2.

The vibrator horn 4 has an enlarged-diameter portion 4a that increases in diameter toward the tip, and a hollow portion 4b that is formed in a curved shape inside.

A mounting portion 5 for fixing a solenoid valve for supplying a liquid substance is formed at one end of the vibrator body 2, and a liquid supply path 8 is formed in the axial direction inside the vibrator body 2. There is. A plate 7 having a curved surface shape is formed at the other end of the vibrator body 2, and the plate 7 and the vibrator horn 4 are connected to each other.
A slit 9 is formed along the entire circumference between the two. The slit 9 and the liquid supply path 6 communicate with each other through four injection holes 10.

To explain the operation of the present invention having the above configuration, the liquid supplied from the liquid supply path 6 passes through the injection hole 10 and is uniformly distributed around the entire circumference of the slit 9, and the amount of liquid supplied varies. The clearance of the slit 9 is also displaced by the liquid pressure, and a suitable film thickness is always maintained on the atomization surface, making it possible to uniformly atomize the liquid substance. Further, it is possible to prevent the liquid substance from becoming wavy.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made.

For example, in the above embodiment, the plate 7 is formed integrally with the vibrator main body 2, but it may be provided separately.

〔Effect of the invention〕

As explained above, according to the ultrasonic atomization device of the present invention, the passage for supplying the liquid substance to the atomization surface is formed inside the vibrator body, so that the passageway for supplying the liquid substance to the atomization surface is formed inside the vibrator body. Compared to a method in which a liquid supply passage is provided, the weight is lighter and the size can be reduced.

In addition, a slit is formed at the tip of the vibrator body over the entire circumference between the plate and the vibrator horn, so even if the amount of liquid supplied fluctuates, the clearance of the slit changes due to the liquid pressure. It maintains an appropriate film thickness on the atomization surface and enables uniform atomization of liquid substances.

Furthermore, when the ultrasonic atomization device of the present invention is used as a fuel injection device for an internal combustion engine, it can quickly respond to load fluctuations that require a large amount of fuel, and the atomized droplets have a fine particle size. This makes it possible to obtain a preferable combustion state in the combustion chamber of the internal combustion engine.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of an embodiment of the ultrasonic atomization device of the present invention, FIG. 2 is a bottom view of the vibrator body according to the present invention, and FIG.
FIG. 4 is a schematic cross-sectional view showing an example of a conventional ultrasonic atomization device. ■... Ultrasonic atomization device, 2... Vibrator body, 3...
・Ultrasonic vibration generator, 4... Vibrator horn, 4a...
- Expanded diameter part, 4b hollow part, 6...liquid supply path, 7...
Plate, 9...slit, 10...injection hole. Figure 1 Figure M2

Claims (1)

[Claims] (1) A vibrator body, an ultrasonic vibration generating means fitted to the outer periphery of the vibrator body, a vibrator horn fixed to the tip of the vibrator body, and formed inside the vibrator body. The vibrator horn has an enlarged diameter portion whose diameter increases toward the tip, and a hollow portion is formed in the enlarged diameter portion, and the tip of the vibrator body includes: An ultrasonic atomization device characterized in that a plate is formed, and a slit is formed along the entire circumference between the plate and the vibrator horn, and the slit and the liquid supply path communicate with each other through an injection hole.