JP3697848B2 - Pest control equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pest control apparatus for controlling pests such as burdock that live in water.
[0002]
[Prior art]
Usually, pests such as bow flares inhabit puddles and rainwater. Conventionally, in order to control these pests, drugs have been injected into the water where the pests live.
[0003]
[Problems to be solved by the invention]
However, in the method of injecting a drug, it causes water pollution, pests resistant to the drug also appear, and it is necessary to use another type of drug. In addition, small fish without harm such as medaka were adversely affected by the drugs.
[0004]
An object of the present invention is to provide a pest control apparatus that controls pests without polluting the water quality.
[0005]
[Means for Solving the Problems]
To achieve the above object, the present invention accommodates an ultrasonic element for generating ultrasonic waves, an ultrasonic horn for transmitting ultrasonic waves generated by the ultrasonic elements into water, and the ultrasonic elements . A case that is watertightly attached to a flange provided in the ultrasonic horn, an oscillating unit that oscillates the ultrasonic element, a boosting unit that boosts an oscillation voltage of the oscillating unit and applies the oscillating voltage to the ultrasonic element; The first liquid level sensor that operates the oscillation means when detecting the water surface when the tip of the sonic horn touches the water surface, and the operation of the oscillation means when detecting the water surface when the tip of the ultrasonic horn is submerged by a predetermined amount from the water surface. And a second liquid level sensor for stopping the ultrasonic horn so that an ultrasonic wave is generated only within a predetermined distance from the water surface. According to this configuration, the ultrasonic horn is submerged in water. Effective Manner as to be able to emit ultrasonic waves are not splash water in the water-tight manner attached to the case to the flange portion to the ultrasonic element.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Invention of Claim 1 of this invention accommodates the ultrasonic element which generates an ultrasonic wave, the ultrasonic horn for transmitting the ultrasonic wave which generate | occur | produced in this ultrasonic element in water, and the said ultrasonic element , A case that is watertightly attached to a flange provided in the ultrasonic horn, an oscillating unit that oscillates the ultrasonic element, a boosting unit that boosts an oscillation voltage of the oscillating unit and applies the oscillating voltage to the ultrasonic element; The first liquid level sensor that operates the oscillation means when detecting the water surface when the tip of the sonic horn touches the water surface, and the operation of the oscillation means when detecting the water surface when the tip of the ultrasonic horn is submerged by a predetermined amount from the water surface. And a second liquid level sensor for stopping the ultrasonic horn so that an ultrasonic wave is generated only within a predetermined distance from the water surface. According to this configuration, the ultrasonic horn is submerged in water. Efficient You can emit ultrasound, as well as combating water pests effectively, since not splash water by attaching a watertight manner to the flange portion of the case to the ultrasonic element, adverse effect due to water of the ultrasonic element It can prevent and increase the reliability.
[0007]
【Example】
A first embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes an ultrasonic element that oscillates an ultrasonic wave having a natural wavelength λ. The ultrasonic element 1 has a bolted Langevin type structure. Specifically, the piezoelectric element 101, cylindrical metals provided at both ends of the piezoelectric element 101, and the metal are joined to the piezoelectric element 101. The vibration of the piezoelectric element 101 is transmitted to the lower metal tip portion, and the tip of the piezoelectric element 101 is ultrasonically vibrated.
[0008]
Reference numeral 2 denotes an ultrasonic horn composed of a substantially cylindrical metal. One end of the ultrasonic horn 2 is joined to a metal below the ultrasonic element 1 with a bolt 12. The length of the ultrasonic horn 2 is (n + 1) λ / 2 (n = 0, 1, 2, 3...). Further, as shown in FIG. 2, the ultrasonic horn 2 has an annular flange 3 on the outer periphery, and the position thereof is (2n + 1) λ from the joint between the ultrasonic element 1 and the ultrasonic horn 2. / 4 (n = 0, 1, 2, 3...).
[0009]
A case 4 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, water is not applied to the ultrasonic element 1. Reference numeral 7 denotes an oscillating means for oscillating the 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.
[0010]
λ = c / f (c: speed of sound) ... E
The oscillating means 7 is connected to the boosting means 6 so that the voltage is boosted and applied to the piezoelectric element 101 of the ultrasonic element 1. A battery 8 is a power source for the oscillation means 7.
[0011]
Next, the operation of the pest control apparatus will be described. The ultrasonic element 1 has a resonance frequency, and is most efficient when oscillated near 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. 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. 1, the metal tip portion of the ultrasonic element 1, that is, the joint portion 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 launched into the water from the tip of the ultrasonic horn 2.
[0012]
FIG. 3 shows an ultrasonic waveform. As shown in the figure, the amplitude is Vo and one wavelength is a waveform of λ. If the point A is 0, the point B is 1 / 4λ, that is, 1/4 wavelength, and the point C is 1 / 2λ, that is, 1/2 wavelength. The absolute value of the amplitude is maximum at points B and D (referred to as anti-vibration), and minimum at points C and E (referred to as vibration nodes). That is, the maximum value and the minimum value of the amplitude come every 1 / 4λ. These relationships can be expressed by the following equation.
Point at which the amplitude is maximum (2n + 1) λ / 4 (n = 0, 1, 2, 3...)... B1
Point at which the amplitude is minimized (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
The tip of the ultrasonic element 1, that is, the joint portion with the ultrasonic horn 2 is a point B (λ / 4: maximum amplitude point) in FIG. The tip portion of the ultrasonic horn 2 away from C1 is a point that can be expressed by the formula B1, and the amplitude is maximized. That is, the maximum number of ultrasonic waves that can be emitted into water is the maximum, and insect pests such as bow flares can be killed most efficiently.
[0013]
By emitting ultrasonic waves that are launched into the water, micro bubbles can be generated in the water, and the underwater bowfra and the like can be killed by the impact when the bubbles burst. In the case of boufra, the respiratory tract is ruptured by the above-mentioned impact, and in the larvae of the scorpionaceae, there is a hole in the body surface and the body fluid flows out and dies. Thus, in order to effectively generate micro bubbles generated by ultrasonic waves and increase the impact force due to the bursting of the bubbles, the amplitude of the ultrasonic waves emitted into the 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.
[0014]
Further, the position of the flange 3 of the ultrasonic horn 2 is (2n + 1) λ / 4 (n = 0, 1, 2, 3...) From the joint portion between the ultrasonic element 1 and the ultrasonic horn 2. C2
It is assumed to be a distance. That is, the position of the ultrasonic horn 2 located at a distance C2 from the joint portion between the ultrasonic element 1 and the ultrasonic horn 2 is a point that can be expressed by the formula B2, and the amplitude is minimized. In other words, since the amplitude is 0, there is no problem even if the case 4 is attached via the packing 5 even if mechanical force is applied from the outside, and there is no problem. Deterioration can also be prevented.
[0015]
The above relationship is expressed 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 is 5150 m / s. When the wavelength λ is calculated by the E equation, λ = 18.4 cm. When n in the formula B1, B2, C1, 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 joining portion of the ultrasonic element 1 and the ultrasonic horn 2 to the flange When this corresponds to FIG. 3, the origin 0 is the position of the piezoelectric element 101 of the ultrasonic element 1. The tip is a point B (λ / 4) in the figure. The tip of the ultrasonic horn 2 becomes D (3λ / 4). The position of the flange is C (λ / 2).
[0016]
In the above example, n = 0 is shown, but B1, B2, C1, and C2 are obtained as numerical values other than 0, and the length of the ultrasonic horn 2 and the ultrasonic horn 2 are calculated by these lengths. The length from the joint portion to the flange may be determined. In addition, although the oscillation frequency of the ultrasonic element 1 is 28 kHz, it may be lower or higher than that, and may be in a range where micro bubbles can be generated in water. Preferably, if the oscillation frequency is set low, that is, set to about 20 kHz, the reach of ultrasonic waves in water becomes long, micro bubbles can be generated over a wide range, and insects such as boufras are killed over a wide range. be able to.
[0017]
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 the description thereof is omitted. In the figure, reference numeral 9 denotes a first liquid level sensor. When a water level is detected, the oscillation means 7 is operated to oscillate the ultrasonic element 1. Reference numeral 10 denotes a second liquid level sensor. When the water level is detected again after the first liquid level sensor 9 detects the water level, the operation of the oscillation means 7 is stopped and the oscillation of the ultrasonic element 1 is stopped.
[0018]
Next, the operation of the pest control apparatus will be described. Water becomes an acoustic load for the ultrasonic element 1 and the ultrasonic horn 2, and the ultrasonic wave is emitted from the ultrasonic horn 2 most efficiently 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, which is negative in terms of pest control effects. In the above-described configuration, when the first liquid level sensor 9 detects the water surface, that is, when the tip of the ultrasonic horn 2 touches the water surface, an ultrasonic wave is emitted and the second liquid level sensor detects the water surface, that is, Since the ultrasonic wave is stopped only when the tip of the ultrasonic horn 2 is outside the predetermined distance from the water surface, the ultrasonic wave is surely emitted only at the predetermined distance from the water surface. Ultrasonic waves are emitted efficiently and pests can be killed efficiently.
[0019]
In the present 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 a predetermined amount of the oscillation end side is submerged from the water surface. Moreover, until the predetermined amount of water is submerged is a range in which ultrasonic waves are efficiently emitted from the ultrasonic horn 2, and preferably, the whole of the oscillation end side of the ultrasonic horn 2 is submerged below the water surface. By operating the ultrasonic element 1 from above, it is possible to emit ultrasonic waves over the entire surface on the oscillation end side.
[0020]
【The invention's effect】
As is apparent from the above description of the embodiments, according to the present invention, an ultrasonic element that generates ultrasonic waves, an ultrasonic horn for transmitting ultrasonic waves generated by the ultrasonic elements into water, and the ultrasonic A case in which an ultrasonic element is housed and watertightly attached to a flange portion provided in the ultrasonic horn, an oscillation means for oscillating the ultrasonic element, and an oscillation voltage of the oscillation means are boosted and applied to the ultrasonic element Pressure detecting means, a first liquid level sensor that operates the oscillating means when detecting the water surface when the tip of the ultrasonic horn touches the water surface, and the water surface when the tip of the ultrasonic horn is submerged by a predetermined amount from the water surface. Then, the second liquid level sensor for stopping the operation of the oscillating means is provided, and the tip of the ultrasonic horn is configured to generate an ultrasonic wave only within a predetermined distance from the water surface. Horn By sinking can efficiently emit ultrasonic waves in water can be stably and efficiently ultrasound firing can pests also efficiently killed. In addition, a case is attached to the flange portion in a watertight manner so that the ultrasonic element is not exposed to water.
[Brief description of the drawings]
FIG. 1 is a block diagram of a pest control apparatus showing a first embodiment of the present invention. FIG. 2 is an external perspective view of the ultrasonic horn. FIG. 3 is an ultrasonic waveform, an ultrasonic element, and an ultrasonic horn. FIG. 4 is a block diagram of a pest control apparatus showing a second embodiment of the present invention. FIG. 5 is an operation explanatory diagram of the apparatus.
1 Ultrasonic Element 2 Ultrasonic Horn 3 Flange 5 Packing 6 Case

Claims (1)

An ultrasonic element that generates ultrasonic waves, an ultrasonic horn for transmitting ultrasonic waves generated by the ultrasonic element to water, and the ultrasonic element is housed, and a flange portion provided in the ultrasonic horn is watertight. A case, an oscillating means for oscillating the ultrasonic element, a boosting means for boosting the oscillation voltage of the oscillating means and applying the oscillating voltage to the ultrasonic element, and a tip of the ultrasonic horn when the tip of the ultrasonic horn touches the water surface. A first liquid level sensor that operates the oscillating means when detecting the water surface, and a second liquid level sensor that stops the operation of the oscillating means when detecting the water surface when the tip of the ultrasonic horn is submerged by a predetermined amount from the water surface, A pest control apparatus in which the tip of an ultrasonic horn generates ultrasonic waves only within a predetermined distance from the water surface .

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