JP3076514U - Power ultrasonic transducer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] An ultrasonic transducer with improved efficiency by solving the characteristic mismatch problem generated when two ultrasonic generators are used by using one ultrasonic generator. I will provide a. SOLUTION: In an ultrasonic transducer, an ultrasonic generator composed of two piezoelectric ceramic elements continuously contacting on the same axis and counter masses located at both ends of the piezoelectric ceramic element has a half empty inside. Positioned in a substrate 2 having a length that is a positive multiple of the wavelength, one side of the substrate is provided on both sides of the ultrasonic generator using a cylindrically shaped transmission rod having a length that is a positive multiple of a half wavelength. The piezoelectric ceramic element, the counter mass, and the electric wiring for power supply penetrating through the inside of the transmission rod are connected to the side and one side of the ultrasonic generator and fixed to one side of the ultrasonic generator. Secure the wires with threaded studs at the ends.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a power ultrasonic transducer, and more particularly to an ultrasonic transducer used for ultrasonic cleaning, promotion of a chemical reaction, and the like.

[0002]

[Prior art]

 There is an existing Langevin type of transducer ultrasonic wave mainly used in the fields of ultrasonic cleaning and chemical reaction promotion. The Langeban type is a form in which a piezoelectric element is inserted into an intermediate portion between two metals and the whole is fastened with bolts.

However, since the above-mentioned transducer cannot be used directly in water, it is generally used by attaching it to the wall surface of a washing tank, and there is a limit to the output of one transducer by utilizing longitudinal vibration.

[0004] Therefore, in order to generate a high pressure, it is inconvenient to use a large number of transducers. At this time, if the operation timings of the respective transducers do not match, the deformation caused by the vibration of a specific transducer may occur. There were problems such as the force destroying the surrounding transducers and shortening the original life.

On the other hand, US Pat. No. 4537511 (1985), which is a new concept of a transducer that can be used directly in water by increasing the output of ultrasonic waves, includes one side of an ultrasonic generator in a longitudinal vibration mode using a piezoelectric element. A transducer that emits ultrasonic waves in a radial direction by connecting a rod having a length that is a positive number (n) times a half wavelength (λ / 2) to the end and that is vacant inside is disclosed. .

However, the above-mentioned type has a higher output than the conventional Langeban type, but because one end of the rod is exposed as a free end in the medium, the ultrasonic waves in the vertical direction cannot be emitted. There was a problem that energy was lost due to radiation.

[0007]

[Problems to be solved by the invention]

 Therefore, in order to solve the above-mentioned problems, in the conventional US Pat. No. 5,200,666 (1993) and EP455837 (1991), a piezoelectric type ultrasonic generator is attached to both sides of an empty rod and synchronized. , So that a larger radial ultrasonic power can be obtained. Here, the rod used also has a length that is a positive number (n) times the half wavelength (λ / 2) as described above.

However, in the above method, if the characteristics such as the resonance frequency and the impedance of the two ultrasonic generators do not exactly match, a difference occurs in the phase and amplitude of the longitudinal vibration generated from the two ultrasonic generators. Therefore, there is a problem that the efficiency of the transducer is reduced, and there is a problem that it is difficult to manufacture the two characteristics so that they exactly match each other.

FIG. 3 is a perspective view of a conventional Uchino transducer.

[0010] As shown in the figure, the conventional uchino transducer has a different structure and application from the above-described transducer, but is different from the uchino (IEEE Vol. 44, No3, pp 597-605, 1997).

Here, Uchino reports that it is possible to enhance the output of ultrasonic waves by newly designing the shape of the base (Brass Endcap).

However, according to the Uchino transducer, for a disk-type small actuator having a diameter of about 10 mm, an ultrasonic generator is formed of only a piezoelectric ceramic having a thickness of about 1 mm and a diameter of about 10 mm, and its radial mode is used. However, since it is generally difficult to manufacture a piezoelectric ceramic having a thickness exceeding 50 mm with the above-described thickness, there has been a fundamental limit in enhancing the ultrasonic output of the transducer.

[0013] Accordingly, the present invention has been devised in view of such problems, and its purpose is to use one ultrasonic generator and two ultrasonic generators. In the underwater transducer in the form of a rod for large-capacity cleaning and promoting a chemical reaction, the ultrasonic generator is composed of piezoelectric ceramic and countermass, and the thickness of the piezoelectric ceramic is solved. Using the mode, the ultrasonic output of the transducer can be increased by increasing the number of piezoelectric ceramics used, and the transducer can be expanded by increasing the length of the transmitting rod by a positive multiple of half a wavelength. The total length (substrate length) can be increased continuously from a minimum of about 500 mm to a positive multiple of a half-wave to increase the ultrasonic output of the transducer indefinitely. It is to provide an ultrasonic transducer which is adapted.

[0014]

[Means for Solving the Problems]

 According to a feature of the present invention for achieving the above object, in an ultrasonic transducer, an ultrasonic transducer constituted by a piezoelectric ceramic element continuously contacting on the same axis and counter masses located at both ends of the piezoelectric ceramic element. One side of the base and one side of the ultrasonic generator using a cylindrical transmission rod with a length that is a positive number (n) times the half-wavelength (λ / 2) with the generator inside. The electric wiring for power supply penetrating through the inside of the piezoelectric ceramic element, the counter mass, and the transmission rod located inside the base is fixed with a threaded stud at one end on the outside of the base. A powered ultrasonic transducer is disclosed.

[0015]

[Embodiment of the invention]

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing an embodiment of the power ultrasonic transducer of the present invention. As shown in the drawing, in the present invention, an ultrasonic generator 3 composed of a piezoelectric ceramic element 4 and counter masses 5 at both ends of the piezoelectric ceramic element 4 is located in a base 2 having an empty space. On both sides, a cylindrical transmission rod 6 having a length equal to a positive number (n) times a half wavelength (λ / 2) is provided on one side of the base 2 having an empty space inside and one side of the ultrasonic generator 3. It becomes a structure to be connected.

At this time, the base also has a length that is a positive number (n) times a half wavelength (λ / 2).

According to the features of the method described above, the use of one ultrasonic generator 3 solves the characteristic mismatch problem that occurs when two ultrasonic generators are used, and the efficiency is improved. Is improved.

Also, as shown in FIG. 1, by forming a high displacement base structure in which the inner and outer diameters of the middle portion of the base are larger than both ends, the amplitude of the middle flat portion is about twice as large as that of US Pat. No. 5,200,666. As a result, the underwater sound pressure can be increased by a factor of about 2 to obtain an ultrasonic output in the radial direction.

FIG. 2 is a schematic view showing an embodiment of the power ultrasonic transducer of the present invention.

The structure of the present invention shown in FIG. 2 has a constant structure with no difference between the inner and outer diameters of the middle portion and both ends of the base 2, and when the amplitude becomes large when using the apparatus as shown in FIG. In some cases, it is preferable to use a transducer as shown in FIG. 2 because corrosion occurs on the substrate surface.

As described above, the configuration according to the present invention is an ultrasonic transducer composed of the piezoelectric ceramic element 4 continuously connected on the same axis and the counter masses 5 positioned at both ends of the piezoelectric ceramic element 4. The generator 3 is located in the substrate 2 having a length that is a positive number (n) times the half wavelength (λ / 2) in which the inside is empty, and a half wavelength (λ / 2) Using a transmission rod 6 having a cylindrical structure having a length that is a positive number (n) times as large as that of 2), the transmission rod 6 is connected to one side of the base 2 and one side of the ultrasonic generator 3 and fixed. An electric wiring 8 for power supply penetrating through the piezoelectric ceramic element 4, the counter mass 5, and the transmission rod 6 located inside of the base 2 is fixed and threaded with a threaded stud 7 at one external end of the base 2.

At this time, the base 2 is configured in two forms, a form in which the inner / outer diameter of the intermediate portion is larger than both ends, and a form in which the inner / outer diameter of the intermediate portion and both ends are formed without difference. it can.

[0024]

[Effect of the invention]

 As described above, according to the power ultrasonic transducer of the present invention, the use of one ultrasonic generator 3 solves the problem of mismatched characteristics caused when two ultrasonic generators are used, and the efficiency is improved. Be improved.

Further, by forming the inner and outer diameters of the intermediate portion of the base body larger than those at both ends, the amplitude at the intermediate portion can be approximately twice as large as that of US Pat. No. 5,200,666. A high output ultrasonic wave is obtained.

Table 1 below shows a comparison between the Uchino transducer and the transducer of the present invention.

[0027]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of the power ultrasonic transducer of the present invention.

FIG. 2 is a schematic view showing another embodiment of the power ultrasonic transducer of the present invention.

FIG. 3 is a perspective view of a conventional uchino transducer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power ultrasonic transducer 2 Substrate 3 Ultrasonic generator 4 Piezoelectric ceramic element 5 Counter mass 6 Transmitting rod with empty inside 7 Threaded stud 8 Electric wiring for power supply

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Lim Eui-Soo Republic of Korea, Daejeon-shi, Yusun-k, Jean-Don 171

Claims (3)

[Utility model registration claims] 1. An ultrasonic transducer, comprising: an ultrasonic generator composed of a piezoelectric ceramic element that is continuously contacted on the same axis and counter masses located at both ends of the piezoelectric ceramic element; One side of the base is located in a base 2 having a length of a positive multiple and using a transmission rod having a cylindrical structure having a length of a positive multiple of a half wavelength on both sides of the ultrasonic generator. And an ultrasonic generator connected to and fixed to one side of the ultrasonic generator, a piezoelectric ceramic element positioned inside the base, a counter mass, and a power supply electric wiring penetrating through the inside of the transmission rod are connected to one side of the outside of the base. A power ultrasonic transducer characterized by being fixed at an end with a threaded stud and wired. 2. An inner diameter and an outer diameter of an intermediate portion of the base,
2. The power ultrasonic transducer according to claim 1, wherein the power ultrasonic transducer is formed larger than both ends. 3. The power ultrasonic transducer according to claim 1, wherein the intermediate portion and both ends of the base are formed in a constant shape with no difference in inner / outer diameter.