JPS6311062B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an ultrasonic atomization device.

In conventional ultrasonic atomization devices, an ultrasonic vibrator is disposed at the bottom of a casing that stores a liquid to be atomized, and emits ultrasonic waves into the liquid. Such prior art techniques require relatively large amounts of energy for atomization.

As a prior art to improve the efficiency of atomization,
There is Japanese Patent Application Publication No. 54-34113 and Utility Application Publication No. 181009.
In these prior art techniques, an ultrasonic transducer is placed in a liquid, and a thin-walled cylindrical body having an inner surface that becomes smaller in diameter toward the top is placed directly above the ultrasonic transducer.

In each of these prior art, the shape of the inner surface is
It is not strictly designed to improve the atomization efficiency, and therefore it is desired to further improve the atomization efficiency. Further, since the cylinder body is thin, it tends to vibrate during atomization, which causes a problem in that the efficiency of atomization decreases.

An object of the present invention is to provide an ultrasonic atomization device that can improve atomization efficiency.

The present invention comprises: (a) a casing 1 in which a liquid 2 to be atomized is stored; (b) an ultrasonic vibrator 3 provided at the bottom of the casing 1; (c) fixed to the casing 1; It is arranged directly above the ultrasonic transducer 3, and is a cylindrical body whose outer peripheral surface is a uniform circle with a surface perpendicular to the vertical axis 8, and (c1) a lower end portion below the liquid level 7; c2) It has an upper surface 12 that is located above the liquid level 7 and has a truncated conical shape with the vertical axis 8 as its axis, and (c3) It is a through hole that extends vertically between the lower end and the top 6. An inner surface 10 is formed, and this inner surface 10 has a curve 9 expressed by A=log ₁₀ (B+1), where B is the distance upward from the lower end and A is the distance radially inward from the outer peripheral surface. , and such a cylindrical body 5 having a shape rotated around the axis 8.

FIG. 1 is a sectional view of an embodiment of the present invention. A liquid 2 to be atomized is stored within the casing 1 . An ultrasonic transducer 3 is attached to the lower part of the casing 1. A cylindrical body 5 is supported within the casing 1 by a connector 4 . The cylindrical body 5 is placed directly above the ultrasonic transducer 3. The tapered top 6 of the cylinder 5 is above the liquid level 7 of the liquid 2. Further, the axis 8 of the cylindrical body 5 is vertical.

FIG. 2 shows a cross-sectional view of the cylindrical body 5 viewed from a section including the axis 8. As shown in FIG. The curve 9 has a distance B from the lower end of the cylindrical body 5 and a distance A from the outer surface of the cylindrical body 5.
Then, it is expressed as A=log ₁₀ (B+1). Rotating the curve 9 about the axis 8 results in the inner surface 10 of the cylinder 5. Cylindrical body 5
may be made of metal such as brass, gunmetal, stainless steel, etc. By making the upper surface 12 of the cylindrical body 5 slope downward in the radial outward direction to form a truncated conical shape, the liquid 2 from the upper open end 11 flows down along the upper surface 12, so that the upper open end 11 Atomization is ensured. The outer surface of the cylindrical body 5 has a uniform circular surface perpendicular to the vertical axis 8, and the upper surface 12 has a truncated conical shape with the vertical axis 8 as its axis.
The inner surface 10 is a through hole extending vertically between the lower end and the top 6 of the cylindrical body 5 .

When the ultrasonic transducer 3 is energized, the ultrasonic waves are reflected on the inner surface 10 of the cylindrical body 5 and converge on the small-diameter upper open end 11 of the inner surface 10 . Therefore, the energy of the ultrasonic waves is concentrated near the small-diameter upper open end 11 of the inner surface 10, and atomization occurs with small energy.

In the inventor's experiments, the axial length l=24
In this example using the cylindrical body 5 with a small diameter d1 of the inner surface 10 of 2 mm and a large diameter d2 of 30 mm, it has been confirmed that the power consumption is lower than that of conventional ultrasonic atomization devices. It was done.

In another embodiment, the cylinder 5 is a cylinder made of a material that reflects ultrasonic waves in a liquid, and the inner surface 1
0 may be a surface whose upper part is tapered in a logarithmic relationship.

As described above, according to the present invention, ultrasonic energy is concentrated upward, and even a small amount of energy can be used to atomize, thereby improving efficiency. In particular, according to the present invention, the shape of the inner surface 10 is such that, where B is the distance upward from the lower end of the cylindrical body 5 and A is the distance radially inward from the outer peripheral surface, A=log ₁₀ (B+1). Since the curve 9 represented by is rotated around the vertical axis 8, a force is applied to the liquid 2 vertically upward by the ultrasonic wave from the ultrasonic vibrator 3 located directly below the curve 9. This makes it possible to atomize the liquid. This makes it possible to significantly improve the atomization efficiency compared to the prior art.

Furthermore, in the present invention, the upper surface 12 of the cylindrical body 5
has a truncated cone shape whose axis is the vertical axis 8 of the cylindrical body 5, so the top 6 which is the upper end of the inner surface 10
In other words, the liquid 2 from the open end 11 flows down along the upper surface 12 and therefore does not return into the inner surface 10 . This allows for reliable atomization,
Atomization efficiency can be further improved.

Furthermore, in the present invention, the cylindrical body 5 has an outer surface whose surface perpendicular to the vertical axis 8 is a uniform circle,
Since an inner surface 10 having an axis along the vertical axis 8 is formed within the cylindrical body 5, the cylindrical body 5 has a thick wall. Therefore, the cylindrical body 5 does not vibrate during atomization, and this also makes it possible to improve the atomization efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view of a cylindrical body 5. In FIG. DESCRIPTION OF SYMBOLS 1... Casing, 2... Liquid, 3... Ultrasonic vibrator, 5... Cylindrical body, 6... Top part, 8... Axis line, 10... Inner surface.

Claims (1)

[Scope of Claims] 1 (a) a casing 1 in which a liquid 2 to be atomized is stored; (b) an ultrasonic vibrator 3 provided at the bottom of the casing 1; (c) a casing 1 comprising: It is fixed and placed directly above the ultrasonic transducer 3, and is a cylindrical body whose outer peripheral surface is a uniform circle with a surface perpendicular to the vertical axis 8, and (c1) a lower end portion below the liquid level 7; (c2) an upper surface 12 located above the liquid level 7 and having a truncated conical shape with the vertical axis 8 as its axis;
(c3) An inner surface 10, which is a vertically continuous through hole, is formed between the lower end and the top 6, and this inner surface 10 has an upward distance of B from the lower end, and a radially inward direction from the outer peripheral surface. An ultrasonic wave generator characterized by including a cylindrical body 5 having a shape in which a curve 9 represented by A=log ₁₀ (B+1) is rotated around the axis 8, where A is the distance to the cylindrical body 5. Atomization device.