| 摘要 |
PROBLEM TO BE SOLVED: To improve measuring accuracy and an upper limit value to be measured by reducing vortices in opening holes, accelerating attenuation of unnecessary components of the ultrasonic wave transmitted from ultrasonic transmitter/receivers, and improving S/N of ultrasonic transmission waveform. SOLUTION: This ultrasonic flowmeter is provided with a measurement channel for flowing fluid, the ultrasonic transmitter/receivers provided in the upstream side and the downstream side of the measurement channel, the opening holes 12 in the upstream side and the downstream side allowing the ultrasonic transmitter/receivers 9 to face to the measurement channel, opening hole insulating bodies 21 disposed inside the opening holes 12 and finished of a material having electric insulation, and flow suppressing bodies 14 in the opening holes. The presence of the opening hole insulating bodies can enlarge conduction distances between the ultrasonic transmitter/receivers 9 and the channel bodies formed with the opening holes 12 in a case of a compact storage space so as to enhance voltage endurance causing leak, even if an abnormal high voltage is impressed between the channel body in the attachment side and the ultrasonic transmitter/receivers due to thunderbolt, and can prevent the breakage of the ultrasonic transmitter/receivers 9 by the leakage current to improve the reliability. COPYRIGHT: (C)2004,JPO
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