I. There are several types of high-pressure fans
The fan is a kind of machinery for compressing and conveying gas, the wind pressure is 30kPa~200KPa or the compression ratio e=1.3 Fans of ~3 belong to high-pressure fans. There are many types of fans, which can be roughly divided into the following categories:
1. Vortex fans: also known as vortex air pumps and vortex air pumps, which are divided into single impeller and double impeller.
2. Air ring vacuum pump: In theory, it is not a fan, but an air compressor, but the industry also classifies the air ring vacuum pump as a high-pressure fan. It has single impeller, double impeller, Three types of impellers.
3. Annular high-pressure fan: It is a high-pressure fan used in a special environment, allowing a higher inlet air temperature.
4. Other high-pressure fans: other types of high-pressure fans are customized and vary according to different applications, such as high-temperature and high-pressure fans, different voltage high-pressure fans, variable frequency high-pressure fans, explosion-proof fans High-pressure fans, anti-corrosion high-pressure fans, etc.
Second, there are several ways to start the high-pressure fan
As a type of fan, the start-up method of the high-pressure fan is no different from that of the ordinary fan Different, as long as the operation is carried out in accordance with the regulations, the smooth start and operation of the equipment can be ensured. There are three main ways to start it:
1. Equipped with a frequency conversion motor, and use frequency conversion to start and run
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This startup method has higher purchase cost, but lower operating cost. It is suitable for the load of high-pressure fans that often must adjust the wind speed, and the adjustment range is wide, 0-60hz. However, this method is not suitable for occasions where high-voltage fans need to be started frequently. Some user platforms design fans to be turned on more than ten times a day, which is undoubtedly a torture for fixed-frequency motors. High starting current often leads to premature degradation of insulation. , the motor life will continue to increase.
2. Equipped with a fixed frequency ordinary motor, use star-delta or auto-coupling step-down start
This is a more economical and simpler start-up mode for high-pressure fans When the fan starts, the damper needs to be closed. When the fan reaches the rated voltage, the damper is gradually opened until the temperature of the medium decreases until it is fully opened.
3. Equipped with a fixed frequency ordinary motor and start with a frequency converter
This method is suitable for the high-pressure fan that does not need to adjust the flow frequently during the use of the fan. Under the working conditions, when starting, the motor is first propelled at a higher temperature, and as the air intake temperature of the fan continues to increase, the frequency of the motor is increased, so that the motor will not be overloaded. The downside of this approach is that the adjustment range is limited, only between 40-50hz.
