Device for measuring air volume under multiple work conditions

A measuring device and multi-working-condition technology, which is applied in directions such as detecting fluid flow by measuring pressure difference and volume/mass flow generated by mechanical effects, can solve problems such as difficult air volume, control, and inability to measure, and achieve accurate air volume measurement Effect

Pending Publication Date: 2019-08-09
NANJING JIUNUO TECH
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Problems solved by technology

At this time, our differential pressure measurement value is about 8PA, so it is difficult to effectively guarantee the measurement accuracy.
Such an air volume measurement method is difficult to effectively control the air volume in the future.
If the wind speed is low, it will be even more impossible to measure, and the precise control of the air volume cannot be achieved without effective air volume measurement

Method used

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  • Device for measuring air volume under multiple work conditions

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Experimental program
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Effect test

Embodiment

[0024] In the prior art, the air pipe adopts a straight pipe design (that is, the cross-sectional area of ​​the measuring section 2 is the same as that of the front section 1). When the measurement is required, the working condition 1: the wind speed of the air pipe is 8 meters per second, and the working condition 2: the wind speed is 5 meters. / second. If the straight pipe measurement method, the pipeline dynamic pressure of working condition 1 should be around 50PA, and the pressure difference sensor of 0~100PA can be selected. However, when working condition two is required, when the wind speed is 5m / s, the pipeline dynamic pressure measured at this time should be about 12PA. The accuracy of the 100PA differential pressure sensor we choose is limited, and it is difficult to measure effectively. At this time, it is necessary to replace the differential pressure sensor with a suitable accuracy range.

[0025] By adopting the technical scheme of the present invention, when the ...

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Abstract

The invention discloses a device for measuring the air volume under multiple work conditions. The device comprises an air pipe, the air pipe comprises a front section and a measuring section, the cross section area of the measuring section is less than the cross section area of the front section, and an air volume measuring element is mounted in the measuring section. Under the situation of non-production low-air-volume operation or to-be-produced low-air-volume operation and the like, a pressure difference sensor does not need to be replaced, and the air volume can be still precisely measured.

Description

Technical field [0001] The invention relates to the technical field of air volume measurement, in particular to a multi-working condition air volume measurement device. Background technique [0002] The measurement of air volume is obtained by measuring the average wind speed of the section of the wind pipe, and the measurement of wind speed is usually obtained by measuring the dynamic pressure of the pipe. The accuracy of dynamic pressure measurement is directly related to the accuracy of wind speed. [0003] Wind speed ΔP is the dynamic pressure of the pipeline, and ρ is the air density. Through the formula, we can find the wind speed V∈ΔP. [0004] Due to noise and resistance considerations, the wind speed of the air-conditioning duct is less than 10 m / s, and the corresponding pressure sensor selection range is within 50PA. The smaller the measuring range, the more difficult it is to manufacture. The usual sensors have poor accuracy below 10PA. [0005] The wind speed of the wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/36G01F1/40
CPCG01F1/36G01F1/40
Inventor 杨晓林
Owner NANJING JIUNUO TECH
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