In terms of operating power alone, the energy-saving effect of using variable frequency speed control is far less than that of the fan pump. However, most of the air compressors are in continuous operation for a long time. The traditional working mode is the opening and closing control mode of the intake valve. When the pressure reaches the upper limit, the valve is closed, and when the compressor enters the light load operating pressure and reaches the lower limit, the compressor is turned on and the compressor enters full load operation. This frequent addition and subtraction of the load process not only causes the supply air pressure to fluctuate, but also changes the load state of the air compressor. Since the compressor cannot eliminate the possibility of long-term operation under full load condition at the time of design, the capacity of the motor can only be selected according to the maximum demand, so the selected motor capacity is generally large. In actual operation, the time of light load operation often accounts for a very high proportion, which causes huge energy waste. It is worth pointing out that the stability of the supply pressure has a great influence on the product quality. Usually, the production process has certain requirements on the supply pressure. If the supply pressure is low, the process requirements cannot be met, and waste products may appear. Therefore, in order to avoid the gas supply pressure requirement value is higher, but this will make the gas supply cost high, energy consumption, and also produce a certain unsafe factor.