How to choose a negative pressure fan in different environments? Any good ideas?

Update:11-09-2019
Summary:

There are many kinds of fans in the market. Negative pr […]

There are many kinds of fans in the market. Negative pressure fans, axial fans, centrifugal fans, Roots fans, etc. are all suitable for different environments, and each brand of fan is divided into various performance fans, for example: negative pressure fan Also divided into explosion-proof negative pressure fan, anti-corrosion negative pressure fan, stainless steel negative pressure fan, etc., then which environment is it suitable for? How to choose a negative pressure fan in different environments? Is there any good way?

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1. There is no special requirement for the fan when the air is exhausted. As long as the design conditions and customer requirements are met, the ordinary civil ventilator is the same. However, the speed of the fan generally chooses a lower speed. Because the speed is too high, the overall running noise is large, and the fan and its components are easily damaged. For example, the bearing and the shaft, the belt and the pulley are worn in advance, resulting in frequent replacement of parts and improvement. Maintenance costs. At this time, the basic type of negative pressure fan can be used to achieve the effect of exhausting air.

2, there are many types of process exhaust, some of which may contain welding slag, paint, explosive gas, sometimes need high temperature, smoke exhaust, etc., different treatment methods with different components, different requirements for fans.

3. The welding slag is contained in the gas: the filter should be added, and the motor can not be built in; the exhaust in the welding workshop or the blanking workshop usually takes into consideration the impurities such as metal chips and welding slag contained in the exhaust gas. If these impurities enter the fan, they may scratch parts such as worn bearing belts, and more seriously damage the motor, causing the motor to be scrapped. All requirements are to add a primary filter (filtering particles up to 1 mm in diameter) and the motor is external (to prevent metal chips from entering the motor).