Fan selection steps to install centrifugal fans to consider which?

Fan selection general steps

　　1) Before selecting the fan, you should understand the domestic production and quality of the product, such as the production of ventilator varieties, specifications and special uses of various products, the development and promotion of new products, etc., should also give full consideration to the requirements of environmental protection, in order to choose the best fan.

　　2) According to the different physical and chemical properties of the gas conveyed by the ventilator, choose the ventilator for different purposes. Such as conveying explosive and flammable gases should be selected explosion-proof ventilator; dust removal or conveying coal dust or coal dust ventilator should be selected; conveying corrosive gases should be selected anti-corrosion ventilator; work in high temperature or centrifugal fan to send high temperature gas should be selected high temperature ventilator.

3) in the ventilator selection performance chart to find more than two kinds of ventilators to choose from, should be given priority to choose a higher efficiency, smaller machine number: a larger range of regulation, of course, should also be compared, weighing the pros and cons and decided.

　　4) If the selected fan impeller diameter is much larger than the original fan impeller diameter, in order to use the original motor shaft, bearings and bearings, etc., the motor start time, the strength of the original parts of the fan and the critical speed of the shaft must be accounted for.

　　5) When choosing a centrifugal fan, when the power of the motor used is less than or equal to 75KW of centrifugal fan, it may not be equipped with a valve for starting only. When sending high-temperature flue gas or air and choose the centrifugal boiler fan, should be set up to start with the valve to prevent overload caused by cold running.

　　Centrifugal fan is a commonly used equipment in industry, the use of this equipment is very frequent, and very popular in the market. Of course, when we choose, not at random, but according to their own needs to choose the right model, size, size, etc., some times also need to customize it. So the centrifugal fan in the use of the first to be installed, before the installation to understand all this knowledge clearly, and then the next step in the operation.

　　But some systems have too large a safety factor to consider, and it is not necessary. For example, the actual operating pressure of the centrifugal fan is only 50% of the expected pressure. Even the working point deviates too far from the selection point and causes motor overload. Although the speed of the fan can be changed to solve the motor overload problem. However, it also loses a lot of air volume and thus reduces the capacity of the system.

　　In this case, the simple solution is to choose a high power motor, but it will increase the installation cost and later operating costs.

　　Therefore, in the design of the centrifugal fan, must take into account all aspects of the factors, to achieve a comprehensive understanding and clear.