Flow measurement device

A flow measurement and switching device technology, which is applied in the direction of measuring devices, measuring flow/mass flow, liquid/fluid solid measurement, etc., can solve the problems of unguaranteed detection accuracy, tediousness, flow value error, etc.

Inactive Publication Date: 2003-10-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the timing device 8 will not be able to correctly measure the respective propagation times by exchanging the receiving party and the transmitting party, and the flow value obtained by the flow calculation device 19 will have errors
[0013] As mentioned above, if the characteristics of the two ultrasonic oscillators in the existing flow metering device are not the same, the detection accuracy cannot be guaranteed.
And, if image 3 As shown, the change of inter-electrode capacitance caused by temperature changes varies with different oscillators, so it is necessary to measure the internal impedance change and inter-electrode capacity change when the temperature changes first, and then pick out two oscillators with the same characteristics, etc. some tedious preparations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 It is a block diagram of the flow metering device in Embodiment 1 of the present invention. figure 2 It is an equivalent circuit diagram of the oscillator in the flow metering device in Example 1. image 3 It is a schematic diagram showing the temperature characteristics of the interelectrode capacitances of the first and second oscillators of the flow metering device in Example 1.

[0025] exist figure 1 , the measured fluid flows inside the fluid pipeline 1. The first oscillator and the second oscillator respectively transmit and receive ultrasonic signals. The vibrator is driven by the driving device 4 . The input unit 5 receives the output signals of the oscillators 2, 3 with low impedance. The switching device 6 is responsible for switching the connections between the oscillators 2 , 3 and the drive device 4 and the input unit 5 . The reception detection means 7 detects the reception time from the output signal of the input unit 5 and outputs it. ...

Embodiment 2

[0042] Figure 5 The flow metering device in Embodiment 2 of the present invention is shown in . for and figure 1 The components of the metering device in the shown embodiment 1 and the components with the same symbols are omitted in principle.

[0043] The repeating device 20 sends a repeating signal to the triggering device 21 after receiving the output signal from the comparing device 7 a of the receiving and detecting device 7 . The delay device 22 starts counting a predetermined delay time after receiving the output from the trigger device 21 .

[0044] The driving device 4 drives the oscillator through the switching device 6 after receiving the output of the trigger device 21 and the delay device 22 receiving the signal of the end of the delay time. The timer device 8 starts measuring the required time until receiving the ultrasonic reception signal of the receiver oscillator from the input unit 5 having low input impedance after receiving the detection start signal ...

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Abstract

In the present invention, the input unit receives a signal corresponding to the ultrasonic signal received by the oscillator, and the input impedance of the input unit is set to be much smaller than the impedance value of the inter-electrode capacitance of the oscillator. Therefore, the input impedance of the input unit has more influence on the delay of the received signal than the influence of the impedance variation of the oscillator. The impact of the impedance change of the oscillator in the flow measuring device on the time delay of the received signal can be reduced, and the measurement accuracy of the ultrasonic propagation time can be improved. Even if the interelectrode capacitance of the oscillator changes greatly due to temperature changes, this flow measuring device can measure the propagation time with high precision and accurately measure the flow rate.

Description

technical field [0001] The invention relates to a flow measuring device for measuring the flow of fluid. Background technique [0002] Figure 6 An existing flow metering device is shown in . A first oscillator 2 and a second oscillator 3 for transmitting and receiving ultrasonic signals are arranged on the pipeline 1 through which the fluid flows. The driving device 4 drives the first oscillator 2 to emit ultrasonic waves. The second oscillator 3 receives the ultrasonic signal, and the reception detection device 7 detects the reception time from the received signal. The timer device 8 measures the time required from the drive device 4 driving the first oscillator 2 until the reception detection device 7 detects the reception time, and thereby detects the propagation time T1 of the ultrasonic wave. Thereafter, the switching means 6 changes the transmitting / receiving direction of the ultrasonic waves, and the timing means 8 measures the propagation time T2 of the ultrasoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
CPCG01F1/667G01F1/66
Inventor 中林裕治安倍秀二
Owner PANASONIC CORP
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