Application of High Precision Pressure Sensor in Air Compressor Control System Software
Take a single screw air compressor as an example to illustrate the principle of air compressor. The operation process of screw air compressor is divided into several processes of suction, sealing and conveying, compression and exhaust. When the screw is running in the shell, the screw and the tooth groove of the shell mesh with each other, and the air is sucked in from the air inlet, and the oil is also sucked in, because the tooth groove meshing surface runs to seal the sucked oil and gas and send it to the exhaust port; In the conveying process, the tooth groove meshing gap is gradually reduced, and the oil and gas are compressed; when the tooth groove meshing surface rotates to the shell exhaust port, the higher pressure oil and gas mixture is discharged from the body.
When the frequency converter is selected, the air volume can be changed by changing the speed of the screw rotor. When the air volume changes, the frequency converter changes the speed to adjust the air compressor's air volume, so that the exhaust pressure is constant and saves. The purpose of energy.
In the air compressor control system, the pressure sensor installed on the air outlet pipe at the rear end of the air compressor is selected to control the pressure of the air compressor. When the air compressor is started, the loading solenoid valve is in the off mode, the loading cylinder does not act, and the inverter drives the motor to run at no load. After a period of time (the controller can be set arbitrarily, here is set to 10S), the solenoid is loaded The valve opens, and the air compressor operates with load. When the air compressor is running, if the back-end equipment uses a large amount of air, and the compressed air pressure in the air storage tank and the back-end pipeline does not reach the upper limit of the pressure, the controller acts as a loading valve, opens the air inlet, and the motor loads Operation, continuously generating compressed air to the back-end pipeline. If the back-end gas equipment stops using gas, the compressed gas pressure in the back-end pipeline and the gas storage tank gradually rises. When the upper limit setting value of the pressure is reached, the pressure sensor sends an unloading signal, the loading solenoid valve stops working, and the air inlet is filtered. The motor is turned off and the motor is running without load.
When the air compressor continues to operate, the main body temperature of the compressor will rise. When the temperature reaches a corresponding level, the system software is set to 80℃ (the controller can be set according to the application environment). After the fan has been in operation for a period of time, the temperature of the main engine will drop, and the fan will stop when it is lower than 75°C.