Overview
Air compressor is widely used in power, chemical, mining, metallurgy, refrigeration and other fields, mainly used to provide a constant pressure of compressed air,
For example, gas is supplied to a pneumatic valve to provide a gas source for a process that requires a certain pressure gas. There are many types of air compressors. Currently, screw air compressors are used for air volume, maintenance,
The great advantages in energy saving and service life, etc., have become the mainstream of future market demand, which has become the consensus in the industry and has been widely used in many industries.
Screw air compressor work process as shown below:
The traditional scheme is to use a load-discharge valve to control the air supply of the air compressor. Due to the difference in the working cycle and production process of the air-using equipment, the volume of gas is waved.
Moving, causing the air compressor to frequently load and unload.
(1) Loading
In the loaded state, after the pressure reaches a minimum value, the original control mode determines that the pressure will continue to rise until the maximum pressure value. In the process of pressurization, we must go to the outside world
In the loaded state, after the pressure reaches a minimum value, the original control mode determines that the pressure will continue to rise until the maximum pressure value. In the process of pressurization, we must go to the outside world
Release more heat, resulting in loss of electrical energy. On the other hand, before the gas above the pressure maximum enters the pneumatic element, its pressure needs to be depressurized through the pressure reducing valve.
This process is also an energy-consuming process. And loading is an abrupt process that has a large impact on the equipment and the power grid.
(2) Uninstall
In the no-load state, when the pressure reaches the maximum pressure, the air compressor depressurizes and unloads as follows: close the air intake valve to make the motor idle and divide
(2) Uninstall
In the no-load state, when the pressure reaches the maximum pressure, the air compressor depressurizes and unloads as follows: close the air intake valve to make the motor idle and divide
Excess compressed air from the tank is vented through the vent valve. This adjustment method causes a great deal of energy waste. According to our calculations, the energy consumption of the air compressor when unloaded is about 30 percent
10% to 25% of the full-load operation of the press, which is still a small proportion of the unloading time. In other words, about 20% of the time when the air compressor is operating is empty.
The state, doing nothing, not only wastes power but also increases the mechanical wear of the equipment.
Based on these traditional shortcomings, we conducted an in-depth study of the industry's processes and explored a dedicated inverter for the screw air compressor industry.
Variable frequency screw air compressor control system:
HLP-SK frequency conversion screw air compressor control system features:
1. Stable pipe network pressure: The variable frequency screw air compressor utilizes the stepless speed regulation feature of the inverter, and can pass the internal PID regulator of the controller or inverter.
The pressure realizes the fast adjustment control; Compared with the upper and lower limit switch control of the power frequency operation, the pressure stability improves exponentially;
2. Better energy-saving effect: The inverter adjusts the motor speed in real time according to the actual gas consumption. When the gas consumption is low, it can start automatic sleep, so that it can be effective.
Reducing the idle time or avoiding the idling state of the screw compressor greatly reduces the energy loss.
3, start without impact: As the inverter itself is a soft-start device, the starting current is maximum at about twice the rated current, and the power frequency starts at the rated current
Compared to 6 times more, the start-up shock is very small. The impact on the electrical components of the motor at the moment of starting is reduced, and the life of the motor and the contactor is prolonged.
4, the noise becomes smaller: due to the reduction of the number of frequent air compressor loading and unloading, the noise is reduced accordingly
5, to improve the operating efficiency: As the compressor can not be excluded from the possibility of long-term operation under full load, so you can only determine the maximum demand
The capacity of the motive, so the design capacity is generally larger. In actual operation, the proportion of light-load operation time is very high. If you use frequency control to increase work
effectiveness.
6, improve the performance of the compressor: As the inverter can be easily adjusted continuously, to maintain the stability of pressure, flow, temperature and other parameters.
7, good compatibility: due to the use of modbus communication protocol, can be used in conjunction with most of the air compressor dedicated controller on the market.