JPS6171860A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To increase atomizing power by enlarging the area of a vibrator, by providing such a structure that a front horn and a rear horn are integrally threaded through holes in which a vibrator and an electrode plate can be inserted. CONSTITUTION:Holes 9 having depths capable of receiving vibrators 1 are provided to an aluminum front horn 5 and an aluminum rear horn 4. Next, threads 10 are respectively formed to the outer periphery of the front horn 5 from the right hand end thereof to the middle thereof and the hole of the rear horn 4 and a vibrators 1 comprising lead zircotitanate is inserted in the hole 9 so as to hold the disc part of a spoon shaped copper electrode plate 2 while the leading end of the electrode plate 2 is protruded to the outside from the hole 11 provided to the rear horn 4. In this state, both horns are integrally threaded and, for example, if a liquid supply pipe 8 having a bore with a diameter of 2.5mm is arranged to the upper part of the atomizing part 7 formed to the left end of the front horn 5, assembling is performed without providing holes to the vibrators 1 or horns and the effective areas of the vibrators 1 become large.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ultrasonic atomization device for liquid using an ultrasonic electro-acoustic transducer (vibrator).

(Prior Art) As an example of an ultrasonic atomizer for a liquid fuel combustion device, as shown in the front view of FIG.
The vibrator 1 is sandwiched between the front horn 5 and the rear horn 4, and the bolt 3 compresses and fixes the vibrator 1 to the front and rear hoi. There is one in which a liquid supply hole 6 passing through the bolt 3 is provided. In the figure, 2 is an electrode plate. Incidentally, the smaller the atomized particle size, the more efficient the combustion, and the shorter the flame length, making it more compact for use as a burner for, for example, an oil water heater. In order to reduce the atomized particle size, it is necessary to increase the operating frequency, and to do this, the diameter of the vibrator must be reduced, but in the device described above, holes are drilled in the vibrator in order to tighten it with bolts. Therefore, the area of the vibrator becomes smaller, making it difficult to extract the power necessary for atomization. If an attempt is made to increase the area of the vibrator, the bolt will become thinner, making it difficult to process the liquid supply hole.

(Objective of the Invention) An object of the present invention is to provide an ultrasonic atomization device that eliminates the above-mentioned drawbacks.

(Group of the invention) The present invention provides an ultrasonic atomizer having a structure in which a front horn and a rear horn sandwich a transducer.

Holes are provided at the ends of the front and rear horns that hold the vibrators, and the vibrators and electrode plates are inserted into the holes.

The present invention relates to an ultrasonic atomization device in which a front horn and a rear horn are screwed together and a liquid supply pipe is disposed above an atomization section at the other end of the front horn.

In the present invention, the vibrator is made of lead zirconium titanate (PZT).
, barium titanate, etc. Although there are no particular limitations, PZT is usually used. The front horn and the rear horn may be made of any material that can easily transmit the vibration, but aluminum is usually used. The electrode plate may be any material with good conductivity, but copper plates are usually used.

(Embodiment) Fig. 1 shows an ultrasonic atomizer 9 according to an embodiment of the present invention, in which a screw 10 is cut in the outer circumference of the front horn halfway from the right end and in a hole in the rear horn, and a tadpole is inserted into the hole 9. Insert the PZT vibrator 1 by holding the disc part of the electrode plate 2 made of silk, and insert the tip of the electrode plate 2 (tadpole or comb tail part) externally through the hole 11 provided at the top of the rear horn. The front horn 5 is rotated and integrated with the rear horn 4, and a liquid supply pipe 8 having a hole of λ5 mmφ is disposed above the atomizing section 7 at the left end of the front horn 5. .

In FIG. 1, the outer diameter of the rear horn is made larger than the outer diameter of the front horn, but this may be reversed and threads may be cut in the outer periphery of the rear horn and the hole in the front horn. Further, the hole for taking out the electrode is not limited to the position shown in FIG. 2, and may be formed through the right side of the rear horn or the upper part of the front horn. It is preferable that the diameter of the opening 9 is larger than the outer diameter of the vibrator to provide a gap around the outer circumference of the vibrator.

As a comparative example, an ultrasonic atomizer having the shape shown in FIG. 1 was manufactured, in which the materials of the horn, the vibrator, and the electrode plate were the same as in the example, and the liquid supply hole 6 had a diameter of 1 mm.

Next, an experiment was conducted using the atomizing apparatuses of Examples and Comparative Examples in which kerosene was supplied from the supply pipe or the supply hole and atomized under the conditions shown in Table 1.

The particle size distribution of fog corresponding to the narrow width symbols in Table 1 is shown in FIGS. 3 and 4.

In addition, in the comparative example, the liquid supply hole was too small to allow kerosene to reach 90%.
2 operating frequency is 100 KH because it cannot flow m7/minute
In the case of z, the power required for atomization is a flow rate of 30 m1! /min.

As shown in Figure 3, the average particle size of the comparative example is 40 to 50 μm.
On the other hand, those of the examples are 20 to 30 μm.

As shown in FIG. 4, the particle size of the comparative example is about 30 .mu.m, while that of the example is 18 to 22 .mu.m.

(Effects of the Invention) According to the present invention, unlike conventional products, there is no need to separate holes in the vibrator or horn, so the area of the vibrator can be increased by that much, and therefore the atomization power can be increased, and the average particle size can be increased. It becomes possible to reduce the diameter.

Furthermore, since the area of the atomization section can be increased, efficiency is further improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an ultrasonic atomizer according to an embodiment of the present invention, Fig. 2 is a front view of a conventional ultrasonic atomizer, and Figs. 3 and 4 are illustrations of an embodiment and a comparative example. It is a graph showing particle size distribution of fog. Explanation of symbols 1... Vibrator 2... Electrode plate 3... Bolt 4... Rear horn 5... Front horn/ 6... Liquid supply hole 7... Atomization part
8...Liquid supply pipe 9...Hole 10
...screw\1! 1 Todoroki 1h3- Apparatus 3, amendment person 1 - filing of patent application Ne +44s + Hitachi Chemical Koshu Co., Ltd. 4, agent
Person 5, the drawings 3 and 4 of the drawings subject to amendment. 1959 Patent Application No. 193262 2 Name of the invention Ultrasonic atomization device 3 Relationship with the person making the correction 19ft Patent applicant 8th name f44s+ Hitachi Chemical Co., Ltd. 4th generation
Rijinru is corrected to be "vibration." (2) On page 4, line 8, "Figure 2" is corrected to "Figure 1." (3) On page 4, lines 14-15, "Figure 1" is corrected to "Figure 2."that's all

Claims (1)

[Claims] 1. In an ultrasonic atomizer having a structure in which a vibrator is held between a front horn and a rear horn, a hole is provided at the end of the front horn and a rear horn that hold the vibrator, and the vibrator and electrode are inserted into the hole. An ultrasonic atomizing device in which a plate is inserted, a front horn and a rear horn are screwed together, and a liquid supply pipe is arranged above the atomizing section at the other end of the front horn.