在通風(fēng)管道加工中，如何測(cè)驗(yàn)風(fēng)速及風(fēng)量呢？咱們通常是依據(jù)丈量壓力換算得到的。整理了以下幾條，供我們參考。
In the process of ventilation duct processing, how to test the wind speed and air volume? We usually get it by measuring pressure. Pinxiang Machinery and Electricity as a collation of the following, for our reference.
A、風(fēng)管內(nèi)風(fēng)速的丈量
A. Measurement of wind speed in duct
測(cè)驗(yàn)中需測(cè)定氣體的靜壓、動(dòng)壓和全壓。丈量風(fēng)道中風(fēng)速應(yīng)在氣流比較平穩(wěn)的管段進(jìn)行。氣體全壓的孔口應(yīng)迎著風(fēng)道中氣流的方向，測(cè)靜壓的孔口應(yīng)垂直于氣流的方向。
The static pressure, dynamic pressure and total pressure of the gas should be measured in the test. The measurement of wind speed in the duct should be carried out in the section where the air flow is relatively stable. The orifice of gas full pressure should face the direction of airflow in the duct, and the orifice of static pressure measurement should be perpendicular to the direction of airflow.
氣體壓力(靜壓、動(dòng)壓和全壓)的丈量通常是用插入風(fēng)道中的皮托管將差壓信號(hào)取出，在與之連接的差壓儀器上讀出。
The measurement of gas pressure (static pressure, dynamic pressure and total pressure) is usually made by taking out differential pressure signal with a pitot tube inserted into the duct and reading it out on the differential pressure instrument connected with it.
B、測(cè)定方位的選擇
B. Selection of Measuring Orientation
測(cè)得管道中氣體的真實(shí)壓力值，除了正確使用差壓丈量?jī)x器外，合理選擇丈量斷面、削減氣流擾動(dòng)對(duì)丈量結(jié)果的影響很大。通風(fēng)管道內(nèi)風(fēng)速及風(fēng)量的測(cè)定，是經(jīng)過測(cè)壓差換算得到。丈量斷面應(yīng)盡量選擇在氣流平穩(wěn)的直管段上。丈量斷面設(shè)在彎頭、三通等異形部件前面(相對(duì)氣流活動(dòng)方向)時(shí)，距這些部件的距離應(yīng)大于2倍管道直徑。
In addition to the correct use of differential pressure measuring instrument, reasonable selection of measuring section and reduction of air disturbance have great influence on the measured results. The measurement of wind speed and volume in ventilation duct is obtained by the conversion of pressure difference. The measurement section should be chosen as far as possible in the straight pipe section with smooth air flow. When measuring section is set in front of elbow, tee and other special-shaped parts (relative direction of airflow movement), the distance from these parts should be greater than 2 times the diameter of pipeline.
C、按風(fēng)管形狀進(jìn)行丈量
C. Measuring according to the shape of air duct
a.矩形風(fēng)管
A. Rectangular ducts
可將風(fēng)道斷面劃分為若干等面積的小矩形，測(cè)點(diǎn)布置在每個(gè)小矩形的中心，小矩形每邊的長(zhǎng)度為200mm左右
The cross section of the duct can be divided into several small rectangles of equal area. The measuring points are arranged in the center of each small rectangle. The length of each side of the small rectangle is about 200 mm.
b.圓形風(fēng)管
B. Circular duct
在同一斷面設(shè)置兩個(gè)彼此垂直的測(cè)孔，并將管道斷面分成必定數(shù)量的等面積同心環(huán)，測(cè)點(diǎn)越多，丈量精度越高。
Two perpendicular measuring holes are set in the same section, and the pipe section is divided into a certain number of concentric rings of equal area. The more measuring points, the higher measuring accuracy.
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