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A method to eliminate zero drift of small flow

A small flow, zero-drift technology, applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, testing/calibrating volume flow, etc., can solve the problem of inability to apply ultrasonic flowmeter, affect fluid flow velocity measurement, and fail to meet fluid flow velocity, etc. problem, to achieve the effect of convenient test limit, convenient calculation, accurate flow rate and flow data

Active Publication Date: 2022-04-01
德闻仪器仪表(上海)有限公司
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Problems solved by technology

[0003] Ultrasonic flowmeters usually use the time difference method to measure the flow velocity of the fluid. Due to the problem of zero drift in the internal circuit, the propagation time of the ultrasonic wave in the sound channel contains a delay when used, thus affecting the flow velocity measurement of the fluid, which in turn leads to its measurement accuracy. decline
In the prior art, the delay can only be measured when the fluid flow rate is 0, but in practical applications, the condition of the fluid flow rate being 0 cannot be met, and thus cannot be applied to the actual ultrasonic flowmeter

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  • A method to eliminate zero drift of small flow

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] Such as figure 1 As shown, the ultrasonic flowmeter includes a first ultrasonic transducer SEN1 and a second ultrasonic transducer SEN2 relatively arranged on the wall of the flow channel, and the ultrasonic waves between the first ultrasonic transducer SEN1 and the second ultrasonic transducer SEN2 The included angle between the axis of the sound channel and the flow channel is Ɵ, and in this embodiment, Ɵ=45°. The second ultrasonic transducer SEN2 is located downstream of the first ultrasonic transducer SEN1.

[0033] Such as figure 2 As shown, when the ultrasonic flowmeter is working, the ultrasonic flowmeter realizes the elimination of small flow zero drift in the process of flow calculation, including the following steps:

[0034] S1. Obtain the time Ta from when the ultrasonic wave is emitted from the first ultrasonic transduc...

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Abstract

The invention relates to a method for eliminating zero drift of small flow. The ultrasonic flowmeter includes a first ultrasonic transducer and a second ultrasonic transducer arranged on the wall of the flow channel, the first ultrasonic transducer and the second ultrasonic transducer The included angle between the ultrasonic channel between the transducers and the axis of the flow channel is Ɵ, and the second ultrasonic transducer is located downstream of the first ultrasonic transducer. Obtain Ta and Tb; calculate; obtain Tc and Td, calculate; when the ultrasonic flowmeter calculates the fluid flow velocity V in the flow channel, it uses the time difference to eliminate the zero drift time to accurately calculate the fluid flow velocity V in the flow channel, and then according to V and The cross-sectional area of ​​the flow channel is calculated accordingly to obtain the flow rate in the flow channel. The method for eliminating the zero drift of small flow can calculate the zero drift time data and eliminate the zero drift time to realize the accurate calculation of the flow velocity and the flow rate in the flow channel, and the calculated data is more accurate.

Description

technical field [0001] The invention relates to a method for eliminating zero drift of small flow. Background technique [0002] Ultrasonic flowmeters are widely used in pipelines to measure gas, water and other fluids. For example, ultrasonic gas flowmeters are mostly used in industrial fields with large flows, and in commercial fields with larger users and smaller gas consumption. [0003] Ultrasonic flowmeters usually use the time difference method to measure the flow velocity of the fluid. Due to the problem of zero drift in the internal circuit, the propagation time of the ultrasonic wave in the sound channel contains a delay when used, thus affecting the flow velocity measurement of the fluid, which in turn leads to its measurement accuracy. decline. In the prior art, the time delay can only be measured when the fluid flow rate is 0, but in practical applications, the condition of the fluid flow rate being 0 cannot be met, and thus cannot be applied to an actual ultra...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/667G01F25/10
CPCG01F1/66G01F25/10
Inventor 张宴槐杨鸣赵文华白璐李金泓金思远毛佳敏叶晨曦邹燕妮
Owner 德闻仪器仪表(上海)有限公司