Patent ID: 7963174

Claim:
An ultrasonic flowmeter comprising two ultrasonic transceivers mounted in spaced relation to each other in an axial direction on an outer peripheral surface of a pipe through which a fluid flows, said ultrasonic flowmeter determining a flow velocity of said fluid by receiving an ultrasonic vibration transmitted from one of said two ultrasonic transceivers through said fluid in said pipe, alternately switching between the ultrasonic transceiver at the transmitting end and the ultrasonic transceiver at the receiving end, and measuring the ultrasonic wave propagation time between said two ultrasonic transceivers, wherein each of said ultrasonic transceivers comprises a cylindrical transmitting body closely fixed to the outer peripheral surface of said pipe so as to surround said pipe and an ultrasonic transducer surrounding said pipe and spaced apart from the outer peripheral surface of said pipe, said transmitting body having an axial end surface perpendicular to the axis of said pipe, said ultrasonic transducer having axial end surfaces one of which is fixedly secured to said axial end surface of said transmitting body, said ultrasonic transducer adapted to be extended and contracted in an axial direction thereof by applying a voltage between said axial end surfaces of said ultrasonic transducer, wherein an ultrasonic vibration generated by said ultrasonic transducer is transmitted through said transmitting body to said pipe, and wherein said transmitting body is made of a rubber material.