IP Library › Granted Patent US 12680849
Granted Patent B2
US 12680849 · App. 18/497,327 · Granted Jul 14, 2026

Clamp-on type ultrasonic flowmeter

Inventors: Shiori Yamashita (Asaka-city, JP); Takuya Shibasaki (Ootsuki-city, JP)
Assignee: FUJI ELECTRIC CO., LTD.
G01F1/662G01F1/667G01N29/221G01N29/223G01N29/02
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Quick Facts
Patent No.
US 12680849
App. No.
18/497,327
Granted
Jul 14, 2026
Kind
B2
Abstract

A clamp-on type ultrasonic flowmeter that uses ultrasonic waves for measuring a flow rate of a fluid flowing inside a piping, incudes: an ultrasonic transducer having a wedge on which piezoelectric device is attached. Further, the wedge of the ultrasonic transducer has a positioning recess portion formed on a tilted surface of the wedge, and the positioning recess portion defines a position of the piezoelectric device with respect to the wedge of the ultrasonic transducer when the piezoelectric device is attached thereto.

Claims (11)

1 . A clamp-on type ultrasonic flowmeter that uses ultrasonic waves for measuring a flow rate of a fluid flowing inside a piping, the clamp-on type ultrasonic flowmeter comprising:

an ultrasonic transducer having a wedge on which a piezoelectric device is attached, wherein

the wedge of the ultrasonic transducer has a positioning recess portion formed on a tilted surface of the wedge,

the positioning recess portion defines a position of the piezoelectric device with respect to the wedge of the ultrasonic transducer when the piezoelectric device is attached thereto, and

side surfaces of the positioning recess portion have a tilt expanding toward an outer periphery of the positioning recess portion with respect to a plane perpendicular to a bottom surface of the positioning recess portion.

2 . The clamp-on type ultrasonic flowmeter according to claim 1 , wherein

an acoustic grease is applied between the positioning recess portion and the piezoelectric device, and

the piezoelectric device is fixed in the positioning recess portion via a back-surface member having a cushioning function by using a holder meant for restraining the piezoelectric device.

3 . The clamp-on type ultrasonic flowmeter according to claim 1 , wherein

an acoustic grease is applied between the positioning recess portion and the piezoelectric device, and

the piezoelectric device is fixed in the positioning recess portion via a back-surface member having a cushioning function by using a holder meant for restraining the piezoelectric device.