Patent ID: 6883386

Claim:
An ultrasonic flow amount measuring device, comprising: a pair of ultrasonic transducers to be disposed on an outer surface of a conduit pipe, through which fluid flows in one direction, at upstream and downstream sides thereof in a flowing direction so that an ultrasonic wave transmitted from one of the ultrasonic transducers is reflected at an inner surface of the conduit pipe and is received by the other of the ultrasonic transducers, and a propagation plane including a propagation path of the ultrasonic wave includes an axis line of the conduit pipe, and a positioning mechanism for positioning the ultrasonic transducers at positions with a desired interval so that the ultrasonic transducers are disposed at correct positions and directions, said positioning mechanism including a guide frame to be attached to the outer surface of the conduit pipe for linearly guiding the ultrasonic transducers in an axis direction of the conduit pipe, and spring members, each being disposed between one ultrasonic transducer and the guide frame for elastically pressing the one ultrasonic transducer against the outer surface of the conduit pipe.