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Omnidirectional ultrasonic radiator

An ultrasonic radiation and ultrasonic technology, which is applied in the direction of the fluid using vibration, can solve the problems of ultrasonic transducer breakage, damage, limit the sound wave radiation power of ultrasonic transducer, etc., and achieve the effect of high power and high efficiency.

Inactive Publication Date: 2010-06-30
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Longitudinal vibration sandwich ultrasonic transducers can only radiate ultrasonic energy in a single degree of freedom direction, that is, the radiated energy of the ultrasonic transducer is basically along the longitudinal axis of the ultrasonic transducer, while in other directions other than the longitudinal axis , such as radial, etc., there is very little ultrasonic radiation, therefore, the transducer cannot achieve 360-degree spatial omni-directional radiation of ultrasonic energy
[0004] The design theory of the longitudinal vibration sandwich ultrasonic transducer requires that the longitudinal dimension of the ultrasonic transducer, that is, the diameter, cannot exceed a quarter of the wavelength of the sound wave radiated by the ultrasonic transducer. Therefore, the sound wave radiation of the ultrasonic transducer The area is limited by its own theory and cannot exceed a certain limit, which greatly limits the acoustic radiation power of the ultrasonic transducer
[0005] For the sandwich-type longitudinal vibration piezoelectric ceramic ultrasonic transducer, due to the limitation of the radiation area, the sound intensity of the ultrasonic transducer is also very large under the condition of relatively large radiation power, which leads to the vibration velocity and vibration inside the ultrasonic transducer. The displacement and longitudinal stress are also very large, even exceeding the mechanical strength limit of the material, resulting in fracture or damage of the ultrasonic transducer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] exist figure 1 , 2 Among them, the omnidirectional ultrasonic radiator of this embodiment consists of a left ultrasonic radiation plate 1, a left vibration matching block 2, a radial radiation shell 3, an electrode sheet 4, a right vibration matching block 5, a right ultrasonic radiation plate 6, and an insulating sleeve 7. Piezoelectric ceramic sheets 8 and fastening bolts 9 are connected to form.

[0016] An insulating sleeve 7 is installed outside the middle of the fastening bolt 9, and the insulating sleeve 7 is covered with 4 piezoelectric ceramic sheets 8, and an electrode sheet 4 is installed between every two piezoelectric ceramic sheets 8. An electrode sheet 4 is installed on the right side of a piece of piezoelectric ceramic sheet 8. The electrode sheet 4 on the right side and the interval electrode sheet 4 are connected to the negative electrode of the ultrasonic power supply, and the remaining two electrode sheets 4 are connected to the positive electrode o...

Embodiment 2

[0018] In this embodiment, an insulating sleeve 7 is installed outside the middle of the fastening bolt 9, and the insulating sleeve 7 is covered with four piezoelectric ceramic sheets 8, and an electrode sheet is installed between every two piezoelectric ceramic sheets 8. 4. An electrode sheet 4 is installed on the right end of the piezoelectric ceramic sheet 8 on the right side. The electrode sheet 4 on the right side and the interval electrode sheet 4 are connected to the negative electrode of the ultrasonic power supply, and the remaining two electrode sheets 4 are connected to the positive electrode of the ultrasonic power supply. 4 One piezoelectric ceramic sheet 8 and four electrode sheets 4 constitute a piezoelectric crystal stack. The length of the piezoelectric crystal stack is 20 mm, and the length of the ultrasonic transducer is 80 mm, that is, the ratio of the length of the piezoelectric crystal stack to the length of the ultrasonic transducer is 1 / 4. The diameter...

Embodiment 3

[0020] In this embodiment, an insulating sleeve 7 is installed outside the middle of the fastening bolt 9, and the insulating sleeve 7 is covered with four piezoelectric ceramic sheets 8, and an electrode sheet is installed between every two piezoelectric ceramic sheets 8. 4. An electrode sheet 4 is installed on the right side of the piezoelectric ceramic sheet 8 on the right side. The electrode sheet 4 on the right side and the interval electrode sheet 4 are connected to the negative electrode of the ultrasonic power supply, and the remaining two electrode sheets 4 are connected to the positive electrode of the ultrasonic power supply. Four piezoelectric ceramic sheets 8 and four electrode sheets 4 form a piezoelectric crystal stack. The length of the piezoelectric crystal stack is 20 mm, and the length of the ultrasonic transducer is 60 mm, that is, the ratio of the length of the piezoelectric crystal stack to the length of the ultrasonic transducer is 1 / 3. The diameter of t...

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Abstract

The invention discloses an omnidirectional ultrasonic radiator. An ultrasonic transducer is arranged in a radial radiating shell body, and central lines of the ultrasonic transducer and the radial radiating shell body are overlapped; a left ultrasonic radiating disk is arranged at the left end of the radial radiating shell body, and a right ultrasonic radiating disk is arranged at the right end of the radial radiating shell body. The omnidirectional ultrasonic radiator adopts the principle of coupling vibration and conversion of vibration modes, the ultrasonic radiating disks are arranged at the two ends of the ultrasonic transducer, and the radial radiating shell body is axially arranged at the outer part of the ultrasonic transducer; therefore, the diameter of the radial radiating shell body and the ultrasonic transducer is large, and the thickness and diameter of the ultrasonic radiating disks are small, so that the high-power working and the omnidirectional ultrasonic radiating of the ultrasonic transducer can be realized. With the advantages of high efficiency, high power and omnidirectional ultrasonic radiation, the omnidirectional ultrasonic radiator can be widely applied in the technical fields of ultrasonic cleaning, ultrasonic dispersion, ultrasonic extraction, ultrasonic emulsification and ultrasonicchemistry liquid treatment.

Description

technical field [0001] The invention belongs to the technical field of methods or equipment for generating mechanical vibrations of sub-acoustic frequency, audio frequency or ultrasonic frequency, and in particular relates to an omni-directional ultrasonic radiator working with piezoelectric effect or electrostriction. Background technique [0002] In the field of ultrasonic and underwater acoustic technology, the existing longitudinal vibration sandwich piezoelectric ceramic ultrasonic transducers are widely used, for example, for ultrasonic cleaning, ultrasonic metal and plastic welding, ultrasonic machining and so on. The transducer was invented by the French scientist Lang Zhiwan in the early 20th century. It has the advantages of easy frequency adjustment, high power and high electromechanical conversion efficiency. With the development of science and technology and the wide application of ultrasonic technology, ultrasonic technology has been adopted in many new technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B3/00B06B1/06
Inventor 林书玉
Owner SHAANXI NORMAL UNIV