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Automatic zero drift-correction ultrasound water meter and correction method

A zero-point drift, automatic correction technology, applied in testing/calibration devices, measuring devices, instruments, etc., can solve problems such as exceeding the range of the maximum allowable error and changing the indication error of the small flow measurement section, and achieve the effect of maintaining accuracy

Inactive Publication Date: 2016-03-16
NINGBO WATER METER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This factor will cause the indication error of the small flow measurement section of the factory-calibrated ultrasonic water meter to change after a period of use, and some even exceed the maximum allowable error range specified by the standard.

Method used

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  • Automatic zero drift-correction ultrasound water meter and correction method
  • Automatic zero drift-correction ultrasound water meter and correction method
  • Automatic zero drift-correction ultrasound water meter and correction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: see figure 2 and image 3 , an ultrasonic water meter that automatically corrects zero point drift, including a measuring tube 1, a group of measuring transducers 2 are correspondingly arranged on the measuring tube 1, and the measuring transducers 2 are connected with a signal transceiving conversion device 3 , the signal transceiving conversion device 3 is connected with a signal processing and display device 4, specifically to this embodiment, the signal transceiving conversion device 3 and the signal processing and display device 4 are connected by an ultrasonic transmitting device 6 and an ultrasonic receiving device 7 Realize the signal transmission. The ultrasonic water meter also includes a zero-flow auxiliary correction transducer group 5, which is used to detect the ultrasonic propagation time difference of the transducer under no flow interference, which is connected with the signal transceiver conversion device 3 Phase signal connection and ...

Embodiment 2

[0028] Example 2: Participation Figure 4 , the present embodiment adopts the same ultrasonic water meter as in Embodiment 1, and adopts the following method during calibration: a method for calibrating the zero drift of the ultrasonic water meter, which is characterized in that it comprises the following steps: a. And calculate the difference in ultrasonic propagation time in the fluid ; b, the zero-flow auxiliary correction transducer group 5 simultaneously measures the ultrasonic propagation time difference of the transducer under no flow interference c, the results measured in step a and step b are all transmitted to the signal processing and display device 4 through the signal transceiving conversion device 3; d, the signal processing and display device 4 correct the time difference as - , then use - Calculate instantaneous flow and cumulative flow.

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Abstract

The invention discloses an automatic zero drift-correction ultrasound water meter and a correction method. The apparatus comprises a zero flow auxiliary correction transducer set. The zero flow auxiliary correction transducer set can detect ultrasound wave spreading time difference without the interference of flow, is connected with a signal receiving-sending conversion device via a signal and send data to a signal processing and displaying device. The correction method works in a way that according to time difference detected by a measuring transducer set and an auxiliary transducer set via the signal processing and displaying device. Compared with the prior art, zero drift influence quantity in the measuring result can be eliminated, so ultrasound water meter measuring accuracy can be maintained.

Description

technical field [0001] The invention belongs to the technical field of water meters, in particular to an ultrasonic water meter for automatically correcting zero point drift and a correction method thereof. Background technique [0002] At present, the application of ultrasonic water meters in the measurement of water in closed pipes is being popularized, and its measurement principle can be expressed as follows: figure 1 expression. [0003] Ultrasonic forward and reverse propagation time: [0004] Propagation time difference: [0005] Volume instantaneous flow calculation formula: [0006] Cumulative flow calculation formula: [0007] In the formula, - the instantaneous volume flow of water in a closed pipe; —Ultrasonic water meter measuring tube inner diameter; - the angle between the transducer installation axis and the measurement tube axis; , - the forward and reverse propagation time of ultrasonic waves in the medium (that is, the propagation t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66G01F25/00
CPCG01F1/66G01F25/00
Inventor 姚灵
Owner NINGBO WATER METER
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