Principle and characteristics of frequency conversion control

With the continuous development of science and technology, AC motor speed regulation technology has been widely adopted. Through a new generation of fully controlled electronic components, the frequency converter is used to change the speed of the AC motor to control the fan flow, which can greatly reduce the energy loss caused by the previous mechanical flow control. Energy-saving principle of variable frequency regulation: It can be seen that when the speed is reduced to half of the original rated speed, the flow, pressure, and shaft power of the corresponding working point are reduced to 1/2, 1/4, and 1/8 of the original, which is why the variable frequency regulation method can save electricity significantly. According to the characteristics of variable frequency regulation, in the sewage treatment process, the aeration tank always maintains a normal liquid level of 5m, and the blower is required to adjust the flow over a large range under the condition of constant outlet pressure. When the adjustment depth is large, the wind pressure will drop too much and cannot meet the process requirements. When the adjustment depth is small, its energy-saving advantage cannot be shown, but the device is complicated and the one-time investment is increased. Principle and characteristics of inlet guide vane adjustment
The inlet guide vane adjustment device is a set of guide vanes with adjustable rotation angles installed near the air inlet of the blower - the inlet guide vanes, which is used to rotate the airflow before entering the impeller, causing a twisting speed. The guide vanes can rotate around their own axes. Each rotation of the blades means changing the installation angle of the guide vanes, so that the direction of the airflow entering the fan impeller changes accordingly.