Gas ultrasonic transducer with metal protection film structure at front end of matching layer
A technology of matching layer and protective film, which is applied in the direction of fluid using vibration, can solve the problems affecting the measurement accuracy of gas flowmeter, the adverse effect and failure of gas ultrasonic transducer performance, etc., so as to improve the anti-fouling and anti-wear capabilities, The effect of reducing sensitivity and improving consistency
Active Publication Date: 2016-01-27
ZHEJIANG UNIV
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Problems solved by technology
Stains adhered to or worn out on the surface of the matching layer will adversely affect the performance of the gas ultrasonic transducer, or even fail, thereby affecting the measurement accuracy of the gas flowmeter
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0017] Such as figure 1 As shown, the present invention includes a piezoelectric sheet 1, a matching layer 2, a metal protective film 3, a sealing ring 4, a plastic shell 5, a soft rubber filling layer 6, a metal pressure plate 7, a metal shell 8, a hard sealant layer 9 and a wire 10. The metal shell 8 is sequentially equipped with a plastic shell 5, a metal pressure plate 7 and a hard sealant layer 9 from bottom to top, and the two wire cores in the wire 10 are respectively welded to the edges of the positive and negative faces of the piezoelectric sheet 1 , the shielding layer of the wire 10 is connected to the metal shell 8, and this structure can improve the signal-to-noise ratio of the transducer. The matching layer 2 and the piezoelectric sheet 1 are located in the plastic shell 5, the upper end surface of the piezoelectric sheet 1 is connected t...
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Abstract
The invention discloses a gas ultrasonic transducer with a metal protection film structure at the front end of a matching layer. A metal shell is internally provided with a plastic shell, a metal pressing plate and a hard sealing glue layer from bottom to top in sequence. Two wire cores in a wire are welded to the edge of the positive electrode face and the edge of the negative electrode face of a piezoelectric plate respectively. The upper end face of the piezoelectric plate is connected with a boss in the center of the plastic shell, and the lower end face of the piezoelectric plate is embedded in a positioning groove in the center of the upper end face of the matching layer. The part among the piezoelectric plate, the matching layer and the plastic shell is filled with a flexible glue filling layer. A cap-shaped metal protection film is arranged on the lower end face of the plastic shell in a sleeving manner and connected with the lower end face of the matching layer, and a sealing ring is arranged between the brim of the cap-shaped metal protection film and the metal shell. The gas ultrasonic transducer has extremely good high-pressure resistance and corrosion resisting capability and is suitable for being installed in a gas ultrasonic flow meter used for metering the volume flow of high-pressure gas media containing a trace of solid particles and a trace of liquid impurities and powered through a low-voltage power source.
Description
technical field [0001] The invention relates to a gas ultrasonic transducer, in particular to a gas ultrasonic transducer with a metal protective film structure at the front end of a matching layer. Background technique [0002] Due to the characteristics of high measurement accuracy, wide range ratio, no pressure loss, no moving parts, and low installation costs, gas ultrasonic flowmeters are gradually replacing traditional mechanical gas flowmeters on a large scale. Part of the gas ultrasonic flowmeter is powered by a built-in power supply, and the voltage of the power supply is generally relatively low. The gas ultrasonic transducer used in it is generally an acoustically matched gas ultrasonic transducer that can be excited by low voltage to obtain higher sensitivity. The transducer, the matching layer material at the front end of the transducer is generally low-density material, the material is soft, easy to absorb stains, and is also very easy to be worn. Stains adher...
Claims
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Login to View More IPC IPC(8): B06B1/06
Inventor 傅新徐婵娜吴建文王楚男陈思徐顺
Owner ZHEJIANG UNIV