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Air coupling ultrasonic transducer for non-contact detection of insulation defects of switch cabinet

An ultrasonic transducer, air-coupling technology, applied in the field of acoustic transducers, can solve the problems of low efficiency of air-coupled ultrasonic transducers, large differences in acoustic impedance, fast ultrasonic attenuation, etc., to improve sensitivity and frequency bandwidth characteristics , The signal rises quickly, and the effect of improving the conversion rate

Active Publication Date: 2022-04-12
YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the problem of the transducer is that the ultrasonic wave in the air attenuates quickly, and the acoustic impedance of the air is quite different from that of the material, which makes the efficiency of the air-coupled ultrasonic transducer low, the frequency band is narrow, and the pulse aftershock is long.

Method used

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  • Air coupling ultrasonic transducer for non-contact detection of insulation defects of switch cabinet
  • Air coupling ultrasonic transducer for non-contact detection of insulation defects of switch cabinet
  • Air coupling ultrasonic transducer for non-contact detection of insulation defects of switch cabinet

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Embodiment 1

[0031] The embodiment of the present disclosure introduces an air-coupled ultrasonic transducer for non-contact detection of insulation defects of switch cabinets.

[0032] In order to improve the sensitivity of the air-coupled ultrasonic transducer, this embodiment introduces a new type of air-coupled ultrasonic transducer. In air-coupled ultrasonic transducers, piezoelectric wafers are the core components of the entire transducer. In order to realize the acoustic impedance transition, this embodiment properly designs the number of matching layers, and designs an air coupler with four matching sub-layers.

[0033] Such as figure 1 The shown air-coupled ultrasonic transducer (referred to as the transducer for short) for the non-contact detection of insulation defects in switchgear adopts a cylindrical structure, including a coaxial hard sealant layer arranged from the inside to the outside. , metal pressure plate, soft rubber backing, piezoelectric chip and matching layer; t...

Embodiment 2

[0040] This embodiment introduces an air-coupled ultrasonic transducer matching system for non-contact detection of switchgear insulation defects, using the air-coupled ultrasonic transducer introduced in the embodiment for non-contact detection of switchgear insulation defects transducer.

[0041] Such as Figure 4 An air-coupled ultrasonic transducer matching system for non-contact detection of switchgear insulation defects is shown, including a matching circuit, a signal acquisition module and an air-coupled ultrasonic transducer; the ultrasonic signal is transmitted to the air-coupled ultrasonic transducer through the matching circuit In the transducer, the impedance signal of the transducer collected in real time is fed back to the matching circuit through the signal acquisition module.

[0042] The external temperature, load and other factors will have a certain impact on the impedance and frequency characteristics of the transducer, which may cause impedance mismatch. Th...

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Abstract

The invention provides an air coupling ultrasonic transducer for non-contact detection of insulation defects of a switch cabinet. The air coupling ultrasonic transducer comprises a flexible glue backing, a piezoelectric wafer and a matching layer which are coaxially arranged from inside to outside, the matching layer adopts a multi-layer matching sub-layer structure, the outer surface of the matching layer is provided with a protective film, the inner surface of the matching layer is provided with a groove, and one end of the piezoelectric wafer is embedded into the groove; the piezoelectric wafer is connected with the flexible glue backing through a first electrode and connected with the matching layer through a second electrode. According to the air coupling ultrasonic transducer probe, optimization design is carried out on the air coupling ultrasonic transducer probe, the reliability, the sensitivity and the sound wave conversion efficiency of the air coupling ultrasonic transducer are improved based on the optimization design of the matching layer and the matching circuit, and the sensitivity and the measurement precision of the air coupling ultrasonic transducer in the aspect of high-voltage switch cabinet detection are achieved.

Description

technical field [0001] The disclosure belongs to the technical field of acoustic transducers, and in particular relates to an air-coupled ultrasonic transducer for non-contact detection of insulation defects of switch cabinets. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] With the rapid development of the power system, the switchgear is an important equipment of the power system, and its safe and stable operation is very important to the whole power system. Long-term operation of the switchgear may show insulation deterioration, and insulation defects will cause serious damage to the insulation if left unchecked. There are a large number of switchgears used in the power system, the internal structure of the switchgear is compact, there are many components, and its layout is relatively complicated; when the internal insulation defects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/06
Inventor 郑建张静杨富栋孙韬备王彦清杜业平张春旭张岩戚树江冯琦赵科技
Owner YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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