通风管道加工时如何测试管道漏风量？
How to test the air leakage rate of ventilation ducts during processing?
1、漏风量测试装置应采用经检验合格的专用测量仪器，或采用符合现行国家标准《用安装在圆形截面管道中的差压装置测量满管流体流量》GB2624规定的计量元件组成的测量装置。
1. The air leakage testing device should use specialized measuring instruments that have been inspected and qualified, or a measuring device composed of measuring elements that comply with the current national standard GB2624 "Measuring Full Pipe Fluid Flow with Differential Pressure Devices Installed in Circular Cross Section Pipelines".
2、正压或负压通风管道系统与设备的漏风量测试，分正压试验和负压试验两类，可采用正压试验的测试来检验。
2. The leakage test of positive or negative pressure ventilation duct systems and equipment can be divided into two categories: positive pressure test and negative pressure test. Positive pressure test can be used for inspection.
3、通风管道系统漏风量测试可整体或分段进行。
3. The air leakage test of the ventilation duct system can be conducted as a whole or in sections.
4、通风管道系统漏风量测试应按下列步骤进行：
4. The air leakage test of the ventilation duct system should be carried out according to the following steps:
① 测试前，被测通风管道系统的所有开口处均应严密封闭，不得漏风。
① Before testing, all openings of the tested ventilation duct system should be tightly sealed and there should be no air leakage.
② 将专用的漏风量测试装置用软管与被测通风管道系统连接。
② Connect the dedicated air leakage testing device with a hose to the tested ventilation duct system.
通风管道加工
Ventilation duct processing
③开启漏风量测试装置的电源，调节变频器的频率，使通风管道系统内的静压达到设定值后，测出漏风量测试装置上，流量节流器的压差值△P。
③ Turn on the power supply of the air leakage testing device, adjust the frequency of the frequency converter, and ensure that the static pressure in the ventilation duct system reaches the set value. Then, measure the pressure difference △ P of the flow restrictor on the air leakage testing device.
④ 测出流量节流器的压差值△P后，按公式Q=f(△P)(m³/h)计算出流量值，该流量值Q(m³/h)再除以被测通风管道系统的展开面积F(㎡)，即为被测通风管道系统在实验压力下的漏风量QA [m³/(h·㎡)]。
④ After measuring the pressure difference △ P of the flow restrictor, use the formula Q=f (△ P) (m ³/ h) Calculate the flow rate value, which is Q (m) ³/ h) Divide it by the unfolded area F (㎡) of the tested ventilation duct system to obtain the air leakage rate QA of the tested ventilation duct system under experimental pressure [m] ³/ (h · ㎡).