在通风管道加工中，如何测验风速及风量呢？咱们通常是依据丈量压力换算得到的。整理了以下几条，供我们参考。
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、风管内风速的丈量
A. Measurement of wind speed in duct
测验中需测定气体的静压、动压和全压。丈量风道中风速应在气流比较平稳的管段进行。气体全压的孔口应迎着风道中气流的方向，测静压的孔口应垂直于气流的方向。
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.
气体压力(静压、动压和全压)的丈量通常是用插入风道中的皮托管将差压信号取出，在与之连接的差压仪器上读出。
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、测定方位的选择
B. Selection of Measuring Orientation
测得管道中气体的真实压力值，除了正确使用差压丈量仪器外，合理选择丈量断面、削减气流扰动对丈量结果的影响很大。通风管道内风速及风量的测定，是经过测压差换算得到。丈量断面应尽量选择在气流平稳的直管段上。丈量断面设在弯头、三通等异形部件前面(相对气流活动方向)时，距这些部件的距离应大于2倍管道直径。
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、按风管形状进行丈量
C. Measuring according to the shape of air duct
a.矩形风管
A. Rectangular ducts
可将风道断面划分为若干等面积的小矩形，测点布置在每个小矩形的中心，小矩形每边的长度为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.圆形风管
B. Circular duct
在同一断面设置两个彼此垂直的测孔，并将管道断面分成必定数量的等面积同心环，测点越多，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.
Above is the related content of Shandong ventilation duct processing and finishing. More information or product requirements can be directly clicked on our official website for consultation: http://www.jnqsg.com
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