At present, the domestic air compressor market takes the goal of energy saving, environmental protection and cost reduction as the primary demand, and the new products developed are very popular. However, economically speaking, it cannot completely replace the conventional screw air compressor with large area and large capacity in use. Therefore, the use of inverter technology to carry out energy-saving retrofitting of compressors will be more pervasive. Therefore, it is very necessary to understand and grasp the air compressor inverter (VFD).
Air compressor VFD is dedicated to various compressors, and VFD is mainly used for speed regulation, because it can make the function more stable, more convenient, energy saving and other advantages more and more widely used.
In terms of energy saving: after frequency conversion speed regulation, when the gas consumption of the equipment is reduced, the speed of the motor can be reduced, and the power of the motor can also be reduced to meet the demand for energy saving.
The motor speed of the air compressor has a linear relationship with the practical power consumption of the air compressor, so to reduce the practical power consumption of the air compressor, it is necessary to reduce the motor speed. The principle and results of conservation of energy are as follows.
(1) After using this VFD, the pressure setting of the air compressor can be fine-tuned, that is, the minimum pressure that can meet the requirements of the production equipment is used as a set of pressures. VFD can adjust the speed of the compressor according to the fluctuation trend of the network pressure, and can even eliminate the offline operation of the air compressor, saving electricity.
(2) The system adopts a frequency conversion device, which can stabilize the upper and lower pressure of the pipe network, reduce or even eliminate the pressure fluctuation, so that all the compressors in the system can operate at a lower pressure, meet the production requirements, and reduce the power loss caused by the pressure rise.
(3) Because the air compressor cannot rule out the possibility of long-term full-load operation, the capacity of the motor can only be determined according to the maximum demand of the motor, so the planned capacity is generally large. In fact, light-load operation takes up a large percentage of the time. If frequency conversion is used, the work efficiency during operation can be greatly improved.
(4) Some conditioning methods cannot reduce the operating power of the motor even if the demand is small. When the demand is small, the frequency conversion speed regulation can reduce the speed of the motor, reduce the operating power of the motor, and then achieve the purpose of further energy saving.
(5) Most single-motor drive systems cannot be adjusted according to the load. After the frequency conversion speed regulation, it is very convenient to adjust continuously, and it can adhere to the stability of pressure, flow, temperature and other parameters, and then greatly improve the working function of the air compressor.
In terms of practical operating costs: the operating costs of inverter air compressors are much higher than the purchase costs, and the operating costs will increase with the extension of the use time. Therefore, in order to save the later operating costs, it is imperative to apply the air compressor VFD.
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