通風管道工程的通風類型

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通風管道工程局部通風是針對公共場所通風系統中空氣質量污染嚴重的個別區域進行控制處理。那么今天給大家介紹一下按照工作原理的不同，可以分為以下幾種類型：

Local ventilation of ventilation duct works is to control and deal with individual areas with serious air quality pollution in the ventilation system of public places. Today, I will introduce to you that according to the different working principles, it can be divided into the following types:

1、密閉罩

1. Airtight cover

它把有害物源全部密封在罩內，從罩外吸入空氣，使罩內保持負壓，它只需要較小的排風量就能對有害物質進行有效控制。

It seals all the sources of harmful substances in the cover, sucks air from the outside of the cover, and keeps negative pressure in the cover. It only needs a small exhaust air volume to effectively control harmful substances.

2、柜式排風罩

2. Cabinet exhaust hood

它的結構與密封罩相似，只是罩的一面全部敞開。

Its structure is similar to the sealing cover, except that one side of the cover is completely open.

3、外部吸氣罩

3. External suction hood

由于工藝條件限制，生產設備不能密封時，可采用外部吸氣罩，它是利用排風氣流的作用，在有害物散發地點造成一定的吸入速度，使有害物吸入罩內。

Due to the limitation of process conditions, when the production equipment cannot be sealed, the external suction hood can be used. It uses the effect of exhaust air flow to cause a certain suction speed at the place where the harmful substances are distributed, so that the harmful substances can be sucked into the hood.

4、接受式排風罩

4. Receiving exhaust hood

有些生產過程或設備本身會產生或誘導一定的氣流運動，如高溫熱源上部的對流等，對這類情況，只需把排風罩設在污染氣流前方，有害物隨氣流直接進入罩內。

Some production processes or equipment itself will produce or induce certain airflow movement, such as convection above the high-temperature heat source. For this kind of situation, it is only necessary to set the exhaust hood in front of the polluted airflow, and the harmful substances will enter the hood directly with the airflow.

5、吸吹式排風罩

5. Suction and blowing exhaust hood

吸吹式排風罩是利用射流能量密集、速度衰減慢，而吸入氣流速度衰減快的特點。把二者結合起來，使有害物得到有效控制的一種方法。

The suction and blowing exhaust hood uses the characteristics of jet energy density, slow speed attenuation and fast speed attenuation of suction air flow. A method of combining the two to effectively control harmful substances.

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