The energy required by the fan to move the air in a mechanical ventilation system is supplied by the fan. There are two types of commonly used fans: centrifugal and axial: ① Centrifugal fans have high fan head and low noise. Among them, the back-bending fan with airfoil-shaped blades is a low-noise and high-efficiency fan. Dongguan ventilation equipment ② Axial flow fan, under the condition of the same impeller diameter and rotation speed, the wind pressure is lower than that of centrifugal type, and the noise is higher than that of centrifugal type. It is mainly used for ventilation systems with small system resistance; the main advantages are small size and easy installation. , can be installed directly on the wall or in the pipeline.

The fans used in the ventilation system are divided into dust-proof fans, explosion-proof fans, and anti-corrosion fans according to the conveying medium.

Air filter In order to ensure human health and meet the air cleanliness requirements of some industrial production processes (such as food industry, etc.), the air sent into the room must be purified to different degrees. Air filters are commonly used in air supply systems to remove dust particles in the air. According to different filtration efficiencies, air filters are divided into three categories: coarse, medium and high efficiency. Usually wire mesh, glass fiber, foam, synthetic fiber and filter paper are used as filter materials.

Dust collector and harmful gas treatment equipment When the pollutant concentration in the discharged air exceeds the national emission standard, a dust collector or harmful gas treatment equipment must be set up to make the discharged air meet the emission standard before it can be discharged into the atmosphere.

Dust collector is a kind of equipment for separating solid particles in gas, which is used to remove dust in industrial ventilation system. The powder and granular materials contained in the air discharged from some production processes (such as raw material crushing, non-ferrous metal smelting, grain processing, etc.) are the raw materials or products produced, and it is economically meaningful to recycle them. Therefore, in these sectors, dust collectors are both environmental protection equipment and production equipment.

Dust collectors commonly used in ventilation and dust removal systems are: cyclone dust collector, bag filter, wet dust collector, electrostatic precipitator, etc.

Commonly used harmful gas treatment methods in ventilation systems include absorption method and adsorption method. The absorption method is to use an appropriate liquid as an absorbent to contact with the air containing harmful gases, so that the harmful gases are absorbed by the absorbent or chemically react with the absorbent to become harmless substances. The adsorption method is ventilation equipment Dongguan ventilation equipment

Use certain substances with large adsorption capacity as adsorbents to adsorb harmful gases. Activated carbon is one of the most widely used adsorbents in industry. The adsorption method is suitable for the treatment of harmful low-concentration harmful gases, and the adsorption efficiency can be close to 100%. Due to the lack of economical and effective treatment methods for some harmful gases, untreated or incompletely treated air can be discharged into the sky with high chimneys as a last resort. This method is called high-altitude discharge.

Air heaters In areas with very cold winters, it is not possible to directly send cold outdoor air into the room, and the air must be heated. Surface heat exchangers are usually used to heat air with hot water or steam as the heat medium.

When the air curtain air is ejected from the slit-shaped orifice at a certain speed, it forms a plane jet. If the ventilation equipment in Dongguan is set up with a slit-shaped air inlet to inhale this air flow, a curtain-like air flow will be formed between the blowing and air inlets. The device that uses the momentum of the blowing air itself to cut off the air on both sides of the air flow is called an air curtain. The air curtain installed at the entrance and exit of the building is called the door air curtain. The door air curtain can prevent outdoor wind, dust, insects, polluted air and odor from entering the room, reduce the heat (cold) loss of the building, and does not hinder the passage of people and things. Door air curtains have been widely used in industrial plants, refrigerators, department stores, theaters, etc. where people and vehicles frequently enter and exit. In civil buildings, the upper air supply type with upper air supply is mostly used, and the lower air supply type and side delivery type are mostly used in industrial buildings. Air curtains are also used to control the spread of pollutants in local places. The devices used for this purpose are called air curtain partitions or blowing and suction exhaust hoods. Mass adoption. Compared with the traditional local exhaust hood, it has less power consumption and better pollution control effect without hindering the production operation.