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从前在设计排风罩时,都仅仅局限在吸入气流的吸气罩。也就是借助于吸入气流把空气中的污染物质排出去。然而气流却是分为吹出气流和吸入气流的,吹出气流可以吹到比较远的地方,能量衰减得比较慢,而吸入气流则能量衰减得比较快,二者的关系相辅相成。所以在设计罩时,也应有个全面的合理的设计思想,就是把吹出气流和吸入气流有机地结合起来,合理地设计一种吹吸式排风罩。
When designing exhaust hoods in the past, they were confined to suction hoods that inhaled airflow. That is, by means of inhaled air flow, the pollutants in the air are discharged. However, the airflow is divided into the blowing airflow and the inhaling airflow. The blowing airflow can be blown to a relatively far place, the energy is attenuated relatively slowly, and the inhaled airflow is attenuated relatively quickly. The relationship between the two is complementary. Therefore, when designing the cover, there should also be a comprehensive and rational design idea, which is to organically combine the blowing air flow and the inhaling air flow, and reasonably design a blowing and sucking type exhaust hood.