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测定管道内风量的准备工作!

来源:http://www.ghwl-nmgzx.com/添加时间:2019-08-22 14:42:16
  通风管道现在被广泛应用,在工业送风和排气中,空调通风随处可见。通风管道风速和风量的测量是通过测量压力换算得到的,这是一种较为的计算方法。以下是工作人员测定管道内风量的准备工作:
  Ventilation pipes are now widely used in industrial air supply and exhaust, air conditioning and ventilation can be seen everywhere. The measurement of wind speed and volume in ventilation duct is obtained by measuring pressure conversion, which is a more professional calculation method. The following is the preparation work for the staff to determine the air volume in the pipeline:
  位置的确定和点的确定
  Location determination and point determination
  1. 位置的确定
  1. Location determination
  通过测量压力换算,得到了风洞风速和风量的测量结果。测量断面的合理选择和气流扰动的减小对测量结果影响很大。所测截面位置至少为管道直径的1.5倍。
  The measurement results of wind speed and wind volume in wind tunnel are obtained by measuring pressure conversion. Reasonable selection of measurement section and reduction of air disturbance have great influence on measurement results. The measured section position is at least 1.5 times the diameter of the pipeline.
  在测量过程中,如果在任何测量点上发现零或负值,说明气流不稳定,不能用截面作为测量截面。如果气流方向为15°或以上,则不应测量截面。
  In the course of measurement, if zero or negative value is found at any measuring point, it means that the air flow is unstable and cross-section can not be used as the measuring cross-section. If the direction of the airflow is 15 degrees or more, the cross section should not be measured.
  2. 测试孔和测量点
  2. Test Holes and Measuring Points
  测量必须在同一截面上的多个点进行,并计算截面的平均值。
  The measurement must be carried out at multiple points on the same section and the average value of the section is calculated.
  风道压力的测量
  Measurement of duct pressure
  仪器的测定
  Measurement of Instruments
  气体压力的测量通常是通过插入风管的压力计来进行的,并在与之相连的压力计上读出。常用的仪器有皮托管和压力计。
  Gas pressure is usually measured by a pressure gauge inserted into the duct and read out on the pressure gauge connected to it. The commonly used instruments are pitot tube and pressure gauge.
  1. 毕业托管
  1. Graduation Trusteeship
  为弯曲成90°的双层同心管,开口端与内胎连接,用于测量总压力;在靠近管头的外壁上开一圈小孔,测量静压。
济南厨房排烟管道
  In order to bend a double concentric tube into 90 degrees, the opening end is connected with the inner tube to measure the total pressure, and a small hole is opened on the outer wall near the head to measure the static pressure.
  2. S型毕业托管
  2. S-type graduation trusteeship
  它由两根相同的平行金属管组成,测量时有两个方向相反的开口。在测量时,面对气流的开口等于总压,而面对气流的开口等于静压。这种点蚀管广泛应用于粉尘污染源的监测。
  It consists of two identical parallel metal tubes with two opposite openings. In measurement, the opening facing the airflow is equal to the total pressure, while the opening facing the airflow is equal to the static pressure. The pitting tube is widely used in monitoring dust pollution sources.
  3.U-gauge
  3. U-gauge
  压力表采用u形玻璃管,根据测量的压力范围选择水、酒精或水银。u型压力计不适合测量小压力,压力值由液柱高度差换算而来。
  The pressure gauge adopts U-shaped glass tube, and water, alcohol or mercury are selected according to the pressure range measured. U-type pressure gauge is not suitable for measuring small pressure. The pressure value is converted from the height difference of liquid column.
  4. 倾斜微压计
  4. Tilt micromanometer
  测量压力时,将微压力计容器的开口与测量系统中压力较大的容器连接,斜管与系统中压力较小的容器连接。两个液位上的压差使液柱沿斜管上升。
  When measuring pressure, the opening of the micro pressure gauge vessel is connected with the vessel with larger pressure in the measuring system, and the inclined tube is connected with the vessel with smaller pressure in the system. The pressure difference between the two liquid levels causes the liquid column to rise along the inclined pipe.
  以上是测量通风管道风速和风量前的准备工作。只要做好了准备,就有可能在测量中获得相对准确的数据结果。希望以上分享能对大家有所帮助。
  The above is the preparation work before measuring the wind speed and volume of ventilation duct. As long as the preparation is made, it is possible to obtain relatively accurate data results in the measurement. I hope the above sharing will be helpful to you all.

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