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    • 26. 发明专利
    • Ultrasonic flow measuring instrument
    • 超声波流量测量仪
    • JP2007064792A
    • 2007-03-15
    • JP2005251163
    • 2005-08-31
    • Matsushita Electric Ind Co Ltd松下電器産業株式会社
    • FUJII YASUSHIMURAKAMI HIROKUNISAKAGUCHI YUKIO
    • G01F1/66
    • PROBLEM TO BE SOLVED: To provide an ultrasonic flow measuring instrument capable of measuring a plurality of kinds of fluids different in sonic velocities at the same precision.
      SOLUTION: An ultrasonic propagation time is measured between at least a pair of ultrasonic transceivers 2, 3 arranged with a space in upstream and downstream sides of a fluid passage 1, by a measuring part 8. A flow velocity and/or a flow rate of the fluid is computed by a computing means 10, based on a measured result therein. The measuring part 8 is provided with a plurality of oscillation circuits different in frequencies, and measures the fluids different in the sonic velocities at the same precision, by providing a resolution switching means 11 for conducting switching to the oscillation circuit used for measuring the propagation time in accordance with the sonic velocity of the measuring fluid.
      COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:提供能够以相同的精度测量声波速度不同的多种流体的超声波流量测量仪器。 解决方案:通过测量部分8在至少一对布置有流体通道1的上游和下游侧的空间的超声波收发器2,3之间测量超声波传播时间。流速和/或 基于其中的测量结果,计算装置10计算流体的流速。 测量部分8设置有多个频率不同的振荡电路,并且通过提供用于切换到用于测量传播时间的振荡电路的分辨率切换装置11,以相同的精度测量声速不同的流体 根据测量流体的声速。 版权所有(C)2007,JPO&INPIT
    • 27. 发明专利
    • GAS CUT-OFF CONTROL EQUIPMENT
    • JPH11142205A
    • 1999-05-28
    • JP31017497
    • 1997-11-12
    • MATSUSHITA ELECTRIC IND CO LTD
    • MATSUMOTO TAKAYUKIMURAKAMI HIROKUNI
    • G01F1/00G01F3/22G01M3/00G01M3/26
    • PROBLEM TO BE SOLVED: To provide a gas cut-off control equipment provided with a pressure measuring part which can measure precisely the pressure of gas with constituent elements of low precision. SOLUTION: In a pressure measuring part 4 measuring the pressure of gas, the pressure measurement range is changeable, thereby making the pressure measurement precision changeable. That is, the pressure measurement range is set narrow and a pressure is measured with high precision. When the pressure measuring part 4 is constituted of an analog pressure sensor and an A/D converter, at least one out of the upper reference voltage and the lower reference voltage is changed, thereby changing the pressure measurement range. As a result, measurement of high precision is enabled by using an A/D converter having a small number of bits. The upper reference voltage and the lower reference voltage are automatically changed by the control of a valve closing control part 3, the pressure measurement value by ordinary precision measurement is switched to high precision measurement, and measurement is enabled again.
    • 30. 发明专利
    • FLOWMETER
    • JPH0650789A
    • 1994-02-25
    • JP20584092
    • 1992-08-03
    • MATSUSHITA ELECTRIC IND CO LTD
    • MATSUMURA TERUEMURAKAMI HIROKUNI
    • G01F1/00G01F15/075G01F25/00
    • PURPOSE:To stop feeding a power supply to one sensor when a flow rate reaches a predetermined range by a method wherein whether a flow is forward or reverse is judged from the phase difference in a signal between two sensors. CONSTITUTION:A first sensor part 1 and a second sensor part 2 convert a flow rate and a flow direction respectively into electric signals having different phases, and transmit them to a forward/reverse judgment part 3. The forward/ reverse judgment part 3 compares the phases of output signals from the sensor parts, judges whether a flow is forward or reverse and transmits it to an integration part 4. The integration part 4 adds or subtracts the output signal form the second sensor part 2 according to an output from the forward/reverse judgment part 3 and integrates it. On the other hand, a specific-flow-rate-region detection part 5 detects whether a flow rate detected by the signal form the second sensor part 2 is within a predetermined range or not, and stops feeding a power supply to the first sensor part 1.