JPH1156193A - Device for exterminating insect pest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control insect pests such as mosquito larvae living in water without using a chemical agent to prevent the pollution of the nature due to the chemical agent. SOLUTION: This device for exterminating insect pests comprises an ultrasonic wave element 1 for generating ultrasonic waves, an ultrasonic wave phone 2 for efficiently transmitting the ultrasonic waves generated with the ultrasonic wave element 1 into water, and a case 4 receiving the ultrasonic wave element 1 and water-tightly attached to the flange portion 3 of the ultrasonic wave phone 1 through a packing 5. Ultrasonic waves shot from the ultrasonic wave phone 2 produce microbubbles, which kill insect pests with the broken impacts of the microbubbles. The coverage of the ultrasonic wave element 1 with the case 4 prevents the adhesion of water drops to the ultrasonic wave element 1 and improves the reliability of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pest control apparatus for controlling pests such as burrs living in water.

[0002]

2. Description of the Related Art Normally, pests such as bow hula inhabit puddles and rainwater basins. Conventionally, to control these pests, drugs were injected into the water in which the pests live.

[0003]

However, the method of injecting a drug, however, leads to water pollution, and some pests having resistance to the drug have appeared, so that it is necessary to use another type of drug. In addition, small fish and other harmless fish, such as medaka, were adversely affected by the drug.

An object of the present invention is to provide a pest control apparatus for controlling pests without polluting water quality.

[0005]

To achieve the above object, the present invention provides an ultrasonic element for generating ultrasonic waves, and an ultrasonic horn for transmitting ultrasonic waves generated by the ultrasonic elements into water. A case for accommodating the ultrasonic element, wherein the case is water-tightly attached to a flange portion provided on the ultrasonic horn, and according to this configuration, the ultrasonic horn is submerged in water so that the efficiency is improved in water. Ultrasonic waves can be emitted in a specific manner, and a case is attached to the ultrasonic element in a watertight manner to prevent water from splashing.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION
An ultrasonic element for generating ultrasonic waves, an ultrasonic horn for transmitting ultrasonic waves generated by the ultrasonic element into water, and a case for accommodating the ultrasonic element, wherein the case includes the ultrasonic horn. In this configuration, the ultrasonic horn can be submerged submerged in water so that ultrasonic waves can be efficiently emitted into the water, effectively eliminating pests in the water, Since the case is attached to the sonic element in a watertight manner so that water is not applied to the case, it is possible to prevent the ultrasonic element from being adversely affected by water, thereby improving reliability.

According to the second aspect of the present invention, since the amplitude of the ultrasonic wave is maximized in the vicinity of the oscillation end of the ultrasonic horn, the ultrasonic wave can be emitted into water most efficiently.

According to a third aspect of the present invention, the amplitude of the ultrasonic wave is minimized in the vicinity of the flange of the ultrasonic horn, so that the vibration of the flange is also minimized. The transmission of the ultrasonic vibration between the two is not hindered.

According to the fourth aspect of the present invention, since the ultrasonic element is operated until the oscillation end side of the ultrasonic horn is submerged by a predetermined amount from the water surface, the ultrasonic wave is emitted only within a predetermined distance from the water surface. It is designed not to emit, so that stable and efficient ultrasonic emission is possible.

[0010]

FIG. 1, FIG. 2 and FIG. 3 show a first embodiment of the present invention.
It is explained based on. In the figure, reference numeral 1 denotes an ultrasonic element which oscillates an ultrasonic wave having a specific wavelength λ. The ultrasonic element 1 has a bolted Langevin type structure. Specifically, the piezoelectric element 101, a columnar metal provided at both ends of the piezoelectric element 101, and the metal are bonded to the piezoelectric element 101. For the piezoelectric element 101
Is transmitted to the lower end of the metal, and the upper end is ultrasonically vibrated.

Reference numeral 2 denotes an ultrasonic horn made of substantially columnar metal. One end of the ultrasonic horn 2 is joined to a metal below the ultrasonic element 1 by bolts 12. The length of the ultrasonic horn 2 is (n + 1) λ / 2 (n = 0, 1, 2, 3
···)It has become. The ultrasonic horn 2 is shown in FIG.
Has an annular flange 3 on the outer periphery,
The position is (2n + 1) λ / 4 (n = 0, 1, 2, 3,...) From the joint between the ultrasonic element 1 and the ultrasonic horn 2.
・) It is a distance.

Reference numeral 4 denotes a case, which covers the entire ultrasonic element 1 and a part of the ultrasonic horn 2, and is fixed to the flange 3 through a packing 5 in a watertight manner. By attaching the case 4 in a watertight manner, no water is applied to the ultrasonic element 1. Reference numeral 7 denotes an oscillating unit that oscillates a natural frequency f of the ultrasonic element 1. The relationship between the natural frequency f and the natural wavelength λ is expressed by the following equation.

Λ = c / f (c: sound speed) E oscillation means 7 is connected to boosting means 6, and the voltage is boosted and applied to piezoelectric element 101 of ultrasonic element 1. Reference numeral 8 denotes a battery, which is a power supply of the oscillation unit 7.

Next, the operation of the pest control device will be described. The ultrasonic element 1 has a resonance frequency, and it is most efficient to oscillate around the resonance frequency. The oscillating means 7 using the battery 8 as a power source is configured to oscillate at the resonance frequency of the ultrasonic element 1, and the oscillating voltage of the oscillating means 7 is boosted by the boosting means 6, and the piezoelectric element 101 of the ultrasonic element 1 is increased. , The tip of the metal of the ultrasonic element 1, that is, the joint with the ultrasonic horn 2 in FIG. 1 vibrates. The vibration of the tip portion is also transmitted to the ultrasonic horn 2 joined by the bolt 12, and the ultrasonic wave is emitted from the tip of the ultrasonic horn 2 into water.

FIG. 3 shows the waveform of an ultrasonic wave.
As shown in the drawing, the waveform has an amplitude Vo and one wavelength is λ. Assuming that point A is 0, point B is １ ／ λ, ie, λ wavelength, and point C is λλ, ie, 波長 wavelength. The absolute values of the amplitudes are maximum at points B and D (referred to as antinodes of vibration), and points C and E are minimum (referred to as nodes of vibration). That is, 1 / 4λ
The maximum value and the minimum value of the amplitude come every time. These relationships can be expressed by the following equation. Point where the amplitude is maximum (2n + 1) λ / 4 (n = 0, 1, 2, 3,...) B1 Point where the amplitude is minimum (n + 1) λ / 2 (n = 0, 1, 2) , 3...) B2 The length of the ultrasonic horn 2 is (n + 1) λ / 2 (n = 0, 1, 2, 3,...) C1. Since the tip end, that is, the junction with the ultrasonic horn 2 is at point B (λ / 4: maximum amplitude point) in FIG. 3, the ultrasonic horn 2 is separated from the junction with the ultrasonic element 1 by C1. Is a point that can be expressed by the equation of B1, and the amplitude is maximum.
That is, the maximum amount of ultrasonic waves that can be launched into water can be eliminated, and pests such as bow hula can be killed most efficiently.

[0016] By emitting ultrasonic waves to be launched into the water,
Micro bubbles can be generated in the water, and the impact of the burst of the bubbles can kill the underwater bow hula and the like. In the case of a bow hula, the above-mentioned impact causes the respiratory tract to rupture, and the larvae of the Chironomidae perforate a hole in the body surface to flow out and kill the body fluid. As described above, in order to effectively generate micro bubbles generated by ultrasonic waves and to increase the impact force due to the burst of the bubbles, the amplitude of the ultrasonic waves emitted into water must be maximized as described above. In this embodiment, the amplitude of the ultrasonic wave at the tip of the ultrasonic horn 2 is maximized.

The position of the flange 3 of the ultrasonic horn 2 is (2n + 1) λ / 4 (n = 0, 1, 2, 3,...) From the joint between the ultrasonic element 1 and the ultrasonic horn 2. ... C2. That is, the position of the ultrasonic horn 2 located at a distance of C2 from the junction between the ultrasonic element 1 and the ultrasonic horn 2 is a point that can be expressed by the formula of B2,
The amplitude is at a minimum. In other words, since the amplitude is 0, there is no problem even if the mechanical force is applied from the outside and the case 4 is attached via the packing 5 regardless of the vibration itself. Deterioration can also be prevented.

The above relationship is represented by specific numerical values. For example, the oscillation frequency of the ultrasonic element 1 is 28 kHz, and the metal of the ultrasonic element 1 and the material of the ultrasonic horn 2 are duralumin. In this case, the velocity of the ultrasonic wave in the metal of the ultrasonic element 1 and the ultrasonic horn 2 becomes 5150 m / s. E
When the wavelength λ is calculated from the equation, λ = 18.4 cm. Assuming that n in the formulas B1, B2, C1, and C2 is 0, B1 = λ / 4 = 4.6 cm: maximum amplitude B2 = λ / 2 = 9.2 cm: minimum amplitude C1 = λ / 2 = 9.2 cm : Length of the ultrasonic horn 2 C2 = λ / 4 = 4.6 cm: Distance from the junction between the ultrasonic element 1 and the ultrasonic horn 2 to the flange If this is associated with FIG. Since the ultrasonic element 1 is located at the position of the piezoelectric element 101 of the element 1, the tip of the ultrasonic element 1 is at a point B (λ / 4) in the drawing. The tip of the ultrasonic horn 2 is D (3λ / 4). The position of the flange is C (λ
/ 2).

In the above example, the case where n = 0 is shown, but B1, B2, C1, and C2 are obtained as numerical values other than 0, and the lengths of the ultrasonic horn 2 and the The length from the joint of the acoustic horn 2 to the flange may be determined. In addition, the oscillation frequency of the ultrasonic element 1 is set to 28 kHz, but may be set to a lower frequency or a higher frequency as long as it is within a range where micro bubbles can be generated in water. Preferably, if the oscillation frequency is lowered, that is, set to about 20 kHz, the reach of ultrasonic waves in water becomes longer, micro bubbles can be generated in a wide range, and pests such as bow hula can be killed in a wide range. be able to.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the figure,
Reference numeral 9 denotes a first liquid level sensor, which activates the oscillating means 7 when the water level is detected, and causes the ultrasonic element 1 to oscillate. Reference numeral 10 denotes a second liquid level sensor. When the first liquid level sensor 9 detects the water level again after detecting the water level, the operation of the oscillating means 7 is stopped and the oscillation of the ultrasonic element 1 is stopped.

Next, the operation of the pest control apparatus will be described. Water acts as an acoustic load on the ultrasonic element 1 and the ultrasonic horn 2, and the ultrasonic wave is most efficiently emitted from the ultrasonic horn 2 when the tip of the ultrasonic horn 2 is at a predetermined distance from the water surface. Therefore, even if the tip of the ultrasonic horn 2 is placed too deep, the ultrasonic waves are not efficiently emitted, and the effect of controlling insect pests is negative. In the above configuration, when the first liquid level sensor 9 detects the water surface,
That is, when the tip of the ultrasonic horn 2 hits the water surface,
When the ultrasonic wave is emitted and the second liquid level sensor detects the water surface, that is, when the tip of the ultrasonic horn 2 goes out of a predetermined distance from the water surface, the emission of the ultrasonic wave is stopped, so that the ultrasonic wave is reliably emitted. Since the ultrasonic waves are emitted only at a predetermined distance from the water surface, the ultrasonic waves are emitted very efficiently, and the pests can be killed efficiently.

In this embodiment, the first liquid level sensor 9 and the second liquid level sensor 10 detect that the oscillation end side of the ultrasonic horn 2 is submerged by a predetermined amount from the water surface. Any sensor can be used as long as it can detect that the oscillation end side of the acoustic horn 2 is submerged by a predetermined amount from the water surface. In addition, the term “submersed by a predetermined amount” refers to a range in which ultrasonic waves are efficiently emitted from the ultrasonic horn 2, and preferably, the ultrasonic horn 2
By operating the ultrasonic element 1 after waiting for the whole of the oscillation end side to be submerged under the water surface, it becomes possible to emit ultrasonic waves over the entire oscillation end side.

[0023]

As is clear from the above description of the embodiments,
According to the first aspect of the present invention, the ultrasonic horn is used, and the ultrasonic horn is provided with a flange portion, and the cover is attached thereto in a watertight manner so as to cover the ultrasonic element.
The ultrasonic element can be efficiently emitted into the water without the ultrasonic element getting wet in the water, and the pests can be efficiently eliminated. Moreover, the reliability is high.

According to the second aspect of the present invention, since the amplitude of the ultrasonic wave is maximized in the vicinity of the oscillation end of the ultrasonic horn, the ultrasonic wave can be emitted most efficiently into water.

According to the third aspect of the present invention, the amplitude of the ultrasonic wave is minimized in the vicinity of the flange of the ultrasonic horn. The transmission of the ultrasonic vibration between them is not hindered.

According to the fourth aspect of the present invention, the ultrasonic element is operated until the oscillation end side of the ultrasonic horn is submerged by a predetermined amount from the water surface, so that ultrasonic waves are emitted only within a predetermined distance from the water surface. As a result, stable and efficient emission of ultrasonic waves is possible, and pests can be efficiently killed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a pest control device according to a first embodiment of the present invention.

FIG. 2 is an external perspective view of the ultrasonic horn.

FIG. 3 is a diagram showing a relationship between a waveform of the ultrasonic wave, an ultrasonic element, and an ultrasonic horn.

FIG. 4 is a block diagram of a pest control device according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating the operation of the apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ultrasonic element 2 Ultrasonic horn 3 Flange 5 Packing 6 Case

Claims (4)

[Claims] An ultrasonic element for generating ultrasonic waves, an ultrasonic horn for transmitting ultrasonic waves generated by the ultrasonic element into water, and a case for housing the ultrasonic element, wherein the case is provided. Is a pest control device watertightly attached to a flange portion provided on the ultrasonic horn. 2. The pest control device according to claim 1, wherein the amplitude of the ultrasonic wave is maximized near the oscillation end of the ultrasonic horn. 3. The pest control apparatus according to claim 1, wherein the amplitude of the ultrasonic wave is minimized near the flange of the ultrasonic horn. 4. The ultrasonic element is operated until the oscillation end side of the ultrasonic horn is submerged by a predetermined amount from the water surface.
The pest control device according to the above.