JPS62110772A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To stably pulverize a liq. by providing a slender vibrator with one end connected to an ultrasonic vibration generating means and having an edge part on the other end, and forming the crest and the root constituting the edge part with a curved surface. CONSTITUTION:The ultrasonic vibration generating means and the slender vibrator 1 with one end connected to the ultrasonic vibration generating means and having the end part 2 on the other end are provided. A liq. is supplied to the edge part and the liq. is pulverized. The crest and the root constituting the edge part 2 are formed with a curved surface. The edge part 2 is formed with at least a single stage of multiple angular protrusions A-C having the same diameter and formed on its outer peripheral part. Consequently, a high atomization capacity can be obtained as compared with the conventional atomizer, the conditions of pulverization (flow rate and particle diameter) are not fluctuated by the properties of the supply liq., especially the viscosity, and atomization can be stably performed.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention generally relates to an ultrasonic injection nozzle, and particularly relates to (1) an automotive fuel injection device, such as an electronically controlled gasoline injection valve or an electronically controlled diesel injection valve; )
Fuel nozzles for gas turbines, (3) Burners for industrial, commercial, and household boilers, heating furnaces, and heaters, (4) Industrial liquid sprayers, for example, for liquid materials such as foods, medicines, agricultural chemicals, and fertilizers. Drying sprayers for the purpose of drying, temperature control and humidity control sprays, baked powder sprayers (ceramic granulation), spray coating equipment, reaction accelerators, and (5) non-industrial liquid sprayers, such as pesticide sprayers , Suitable for use in disinfectant sprayers, etc.
The present invention relates to an ultrasonic atomization device that atomizes liquid intermittently or continuously.

Conventionally, in the various fields mentioned above, the term "liquid" is used to include not only liquids but also liquid substances such as suspensions. , i.e. pressure atomizing burners or liquid atomizers are used for atomization. The injection nozzle used in such a spray burner or liquid atomizer atomizes the liquid by a shearing action between the liquid injected from the nozzle and the outside air (atmosphere). Therefore, in order to atomize the supplied liquid, it is necessary to increase the liquid supply pressure, and the liquid supply equipment such as pumps and piping becomes complicated and large.

Furthermore, the adjustment of the jetting meteor can be done by changing the pressure of the feed liquid or
This is done by changing the injection opening area of the nozzle, but with the former method, the state of atomization worsens at low flow rates (at low pressure), and as a countermeasure to this, medium- to large-sized boilers are supplied with air or steam. The aim is to atomize liquid fuel. As a result, the equipment became increasingly complex and large.

On the other hand, in the latter method, the structure of the nozzle is extremely complicated, and its adjustment and maintenance are difficult.

In order to improve these drawbacks of conventional injection nozzles, attempts have been made to inject a liquid substance at high pressure from the injection nozzle and at the same time apply ultrasonic vibrations to the liquid substance.

However, conventional ultrasonic liquid injection nozzles have an extremely small amount of spray, and cannot be used for the above-mentioned injection nozzles that require a large amount of atomization.

In order to achieve atomization of a large volume of liquid, the applicant has conducted numerous studies and experiments on the liquid atomization mechanism using ultrasonic waves and the shape of the ultrasonic transducer. He discovered that by supplying liquid in the form of a thin film to the edge part, the liquid was atomized into large acid from the edge part, and proposed an ultrasonic injection method and an injection nozzle. -77572).

The ultrasonic jet nozzle, that is, the edge portion formed at the tip of the vibrator of the atomizer, that is, the liquid atomization portion, was constructed as illustrated in FIG.

The edge portion 2 formed at the tip of the vibrator l has annular protrusions A and B having the same diameter and having one or more stages, three stages in this example.
, C are formed. The shape of the edge portion 2 when viewed from the direction of the arrow X is not limited to a circular shape, but may be triangular, square, or other polygonal shapes. In addition, the radius (W) and height h) of the grooves forming the protrusions A, B, and C are such that the liquid flow can be made into a thin film.
The size and shape were such that it would fit easily.

Conventionally, in the edge portion 2 of such a structure, the chevron-shaped protrusions A, B
, C need not all have the same shape, and the protrusions A, B
, C need not be chevron-shaped, but the outer circumference f! B (It was understood that it was necessary for an edge to be formed on a mountain.

In other words, according to conventional understanding, (1) When a liquid, for example, liquid fuel, is supplied to the edge portion 2 in the above configuration, the longitudinal vibration applied to the vibrator l causes the fuel to flow at each edge (mountain portion). The flow of fuel is cut off and the supplied fuel is atomized (
2) A portion of the fuel is first atomized in the edge A of the first stage, and excess fuel that cannot be processed in the first stage A is sent to the second stage B and third stage C. (3) Therefore, when the fuel flow rate is large,
The effective area required for atomization becomes large and multiple edges are required, but if the flow rate is small, atomization is completed without using multiple stages.

That's what it was.

In the process of researching conventional vibrators and atomizing devices, the present inventors discovered that the edge portion 2 having the shape shown in FIG. It was found that the supplied liquid accumulated at the edge portions of the protrusions A, B, and C of each stage, and that a large liquid accumulation occurred particularly at the upper protrusion. According to the research conducted by the present inventors, it is not possible to spray a stable and uniform particle size under such liquid supply conditions, and in order to achieve efficient atomization of the liquid, the supplied liquid must be placed at the edge. It has been found that it is important to form a uniform thin film of liquid over the entire area of 2, and at the same time form liquid pools of appropriate size at edge portions A, B, C, etc.

The present invention is based on this new knowledge.

The present invention relates to the improvement of the ultrasonic jet nozzle, that is, the atomization device, particularly the vibrator, according to the invention of the prior application.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic atomization device that can supply liquid intermittently or continuously.

Another object of the present invention is to provide an ultrasonic atomization device capable of achieving stable atomization in which the state of atomization (flow rate, particle size) does not vary depending on the properties of the supplied liquid, particularly viscosity and supply history. It is.

. The above-mentioned objective of achieving a low density is achieved by the vibrator for an ultrasonic jet nozzle according to the present invention. In summary, the present invention comprises an ultrasonic vibration generating means, an elongated vibrator connected at one end to the ultrasonic vibration generating means and having an edge portion at the other end,
An ultrasonic atomizer that supplies liquid to the edge portion and atomizes the liquid, wherein the peaks and valleys forming the edge portion are formed by curved surfaces. It is.

Next, the present invention will be explained in more detail with reference to FIG. 1, which shows an embodiment of an ultrasonic atomization device according to the present invention.

The vibrator shown in FIG. 1 has the same structure as the vibrator described in connection with FIG. That is, at the tip of the vibrator l, there are one or more stages of chevron-shaped protrusions A with the same diameter, three stages in this example.
Annular edge portions 2 labeled B and C are formed, and the protrusions A,
The shapes of B and C are the same as before, for example, the outer diameter (mountain part)
is 7 mm, the valley is 4 mm, and the height of each step (h) is 1 m.
It is assumed that m.

According to the present invention, the acute-angled edge portions of the peaks and valleys forming the respective chevron-shaped protrusions A, B, and C that were formed in the conventional vibrator are eliminated, and the The ridges and the troughs connecting the ridges are formed with curved surfaces. That is, the edge portion 2 is formed of a continuous curved surface. The radius R of the curved surface is 0.1 to 0.1 in the case of an edge portion having the above shape and dimensions.
Preferably, it is 0.6 mm.

With the above configuration, as shown in FIG. 1, the liquid supplied to the edge portion 2 flows smoothly on the surface of the edge portion 2, and an excessive amount of liquid remains at each of the chevron-shaped protrusions A, B, and C. On the surface of the edge portion 2, an appropriate and equalized liquid pool is formed on the surface of the edge portion 2, especially on each curved edge portion, and a uniform thin film of liquid is formed on the area other than each edge portion. As a result, the spray particle size by the edge portion 2 is made uniform and the spray particle size becomes fine, making it possible to spray even liquids with particularly high viscosity and high surface tension with extremely high efficiency.

1. Glossiness I As explained above, the ultrasonic atomization device according to the present invention includes:
Compared to conventional atomization devices, it is possible to spray a larger volume, and it is possible to achieve stable atomization in which the state of atomization (flow rate, particle size) does not vary depending on the properties of the supplied liquid, especially the viscosity.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of an embodiment of an ultrasonic atomization device according to the present invention. FIG. 2 is a partial sectional view of a conventional vibrator. l: Vibrator 2: Edge part 4, B, C: Chevron protrusion

Claims (1)

[Claims] 1) An elongated vibrator comprising an ultrasonic vibration generating means and an elongated vibrator connected at one end to the ultrasonic vibration generating means and having an edge portion at the other end, the edge portion being filled with liquid. An ultrasonic atomizer for supplying liquid and atomizing the liquid, characterized in that peaks and valleys forming the edge portion are formed by curved surfaces. 2) The ultrasonic atomization device according to claim 1, wherein the edge portion is constituted by at least one multi-stage chevron-shaped protrusion formed with the same diameter on the outer peripheral portion.