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Ultrasonic vibrator and ultrasonic flowmeter using the same

An ultrasonic and vibrator technology, applied in the fields of ultrasonic vibrators and ultrasonic flowmeters, can solve the problems of peeling off the bonding part of the metal vibrating plate and damage of the piezoelectric ceramic 1, so as to prevent the peeling of the bonding part and the damage of the piezoelectric body. broken effect

Inactive Publication Date: 2006-10-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the structure of the above-mentioned prior art, since the piezoelectric ceramic 1 is soldered to the metal vibration plate 2, after repeated tests of thermal load (hereinafter referred to as "thermal shock test"), the metal vibration plate 2 and the piezoelectric ceramic 1 have different thermal expansion coefficients, so there is a problem that the bonding part between the metal vibration plate 2 and the piezoelectric ceramic 1 is peeled off or the piezoelectric ceramic 1 is damaged.

Method used

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  • Ultrasonic vibrator and ultrasonic flowmeter using the same
  • Ultrasonic vibrator and ultrasonic flowmeter using the same
  • Ultrasonic vibrator and ultrasonic flowmeter using the same

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Experimental program
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Effect test

no. 1 Embodiment approach

[0060] figure 1 It is a sectional view showing the ultrasonic vibrator according to the first embodiment of the present invention. figure 2 It is a perspective view of the piezoelectric body of the ultrasonic vibrator according to the first embodiment of the present invention.

[0061] exist figure 1 and figure 2 Among them, 100 is an ultrasonic vibrator, 4 is an example of a fixed body to be bonded - a metal cylindrical shell with a collar, 5 is the inner wall surface of the top of the shell 4, and 6 is the opposite 7 is an adhesive that bonds the inner wall surface 5 of the top of the housing 4 to the surface on which one electrode of the piezoelectric body 6 is formed, and 8 is the housing 4 9 is a terminal plate that seals the opening of the housing 4 and fits into the opening (open end) of the housing 4 and fixes the housing supporting portion 8 of the housing 4. 10 is connected to the above-mentioned piezoelectric body 6. 10a is an external terminal for signals t...

no. 2 Embodiment approach

[0111] Figure 14 It is a cross-sectional view of an ultrasonic vibrator according to a second embodiment of the present invention.

[0112] exist Figure 14 Among them, 120 is an acoustic integration layer for achieving integration with the acoustic properties of the fluid to be measured and for increasing the efficiency of the ultrasonic vibrator. Other structures are the same as those of the first embodiment.

[0113] The material of the acoustic integration layer 120 is selected according to the fluid of the object to be measured. When the fluid is a liquid, materials mixed with various fillers such as epoxy resin and inorganic materials such as glass and graphite can be used. When the fluid is air, city gas, etc., the acoustic integration layer 120 can be formed by a composite material in which hollow glass spheres are gathered together with a resin-based material and an inorganic / organic porous body. Acoustic integration layer 120 is an element that obtains the integr...

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Abstract

By adopting a structure in which the difference in thermal expansion coefficient between the case (4) and the piezoelectric body (6) is alleviated by expansion and contraction of the adhesive (7), it is possible to prevent the peeling of the connection between the case (4) and the piezoelectric body (6) and the piezoelectricity of the piezoelectric body (6). damage to body (6). As a result, the ultrasonic vibrator can be used for a long period of time even in an outdoor use environment.

Description

technical field [0001] The present invention relates to an ultrasonic vibrator capable of measuring the flow rate and flow velocity of gas and liquid using ultrasonic waves, and an ultrasonic flowmeter using the same. Background technique [0002] The ultrasonic vibrator used in this ultrasonic flowmeter as the prior art, such as Figure 7 As shown, a piezoelectric ceramic 1 is brazed to a metal vibration plate 2 with a brazing filler metal 3 (see JP-A-4-309817). [0003] Ultrasonic flowmeters are sometimes used as gas / liquid flow monitors for various machinery and equipment or as gas meters for household use. In these cases, they are often installed outdoors. When the ultrasonic flowmeter is installed outdoors, especially in summer, the temperature of the machine is 20°C to 25°C before dawn, and it rises in a short time with the sunrise. Under the setting conditions of direct sunlight, the temperature of the machine itself tends to rise to 60℃~70℃. In addition, when insta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R17/00H10N30/88G01F1/66
CPCG01F1/662H04R17/00
Inventor 足立明久佐藤真人桥本雅彦
Owner PANASONIC CORP