主排烟管道通风面积不够，气体流速过大。框格护坡模具 箱体护坡模具 华尔街铜牛 电阻柜 接地电阻柜 电缆保护接地箱 隔离墩模具 化粪池模具根据工程经验，排烟主管道内风速不能超过15m/s。否则在运行一个时期以后（如一年以后）很容易造成排烟系统不通畅。在油烟净化器的运行实践中，大部分案例都是因排烟管道通风面积不足引起的不通畅，管道内气体的流速都在15m/s以上。
(1) The ventilation area of the main exhaust pipe is not enough, and the gas flow rate is too large. According to the engineering experience, the wind speed in the main exhaust pipe should not exceed 15m / s. Otherwise, after a period of operation (such as a year later), it is easy to cause the smoke exhaust system is not smooth. In the operation practice of oil fume purifier, most cases are caused by insufficient ventilation area of exhaust pipe, and the gas velocity in the pipe is more than 15m / s.
（2）排烟管道由于要穿过建筑梁而使管道通风截面积变小，截面上阻力增加，造成气流不通畅。
(2) Because the smoke exhaust pipe has to pass through the building beam, the ventilation cross-sectional area of the pipe becomes smaller, and the resistance on the cross-sectional area increases, resulting in the air flow is not smooth.
（3）排烟管道在穿过建筑梁或躲避其它设备管道时，排烟管道中的一段会低于整体排烟管道平面。在使用一段时间后，由于油水混合物会积聚在较低的那段排烟管道中，直接影响排烟通畅。
(3) When the smoke exhaust pipe passes through the building beam or avoids other equipment pipes, one section of the smoke exhaust pipe will be lower than the plane of the whole smoke exhaust pipe. After using for a period of time, the oil-water mixture will accumulate in the lower section of the exhaust pipe, which directly affects the smooth exhaust.