Energy-saving principle of variable frequency screw air compressor
Since the speed of the air compressor motor is in a one-time relationship with the actual power consumption of the air compressor, reducing the motor speed will reduce the actual power consumption by year-on-year; the variable frequency screw air compressor uses a pressure sensor to detect the actual gas pressure in the system in real time. And the amount of air, through the precise control of the controller and the internal PID regulator, change the air compressor speed (output power) without changing the air compressor motor torque (ie the ability to drag the load) Adjust system pressure to achieve compressor air on demand output. When the system uses less air, the air compressor provides more compressed air than the system, and the variable frequency air compressor automatically reduces the speed to reduce the compressed air output. Otherwise, the motor speed is increased to increase the compressed air volume and maintain the system pressure. Stable, achieve constant pressure gas supply.
The energy saving effect of the variable frequency screw air compressor can recover the difference within one year (the frequency converter is higher than the common machine price difference), and the whole machine purchase cost is recovered within 2-3 years, and the average load rate of the screw air compressor is estimated to be 67%-70%. Under the condition of 5800 hours, if the frequency conversion machine is used, the annual electricity consumption of the unit under different powers is shown in Figure 1.
