The principle of the screw air compressor operation control system is to achieve fully automatic operation through pressure monitoring and valve linkage. The core is divided into three stages:
1. Start-up stage: The intake unloading valve and the loading solenoid valve are closed, and a small amount of air enters through the throttle hole. The minimum pressure valve establishes the initial pressure to ensure that the lubricating oil is sprayed into the lubricated body.
2. Load operation stage: After star-angle reduced-voltage start-up, the loading solenoid valve opens, the intake unloading valve opens, and the compressor outputs compressed air (the minimum pressure valve opens when the pressure is greater than 0.4MPa). When the system pressure reaches the set value of the inverse proportion valve, the gas supply volume is automatically adjusted to achieve stepless gas volume regulation (supply and demand balance).
3. Unloading and shutdown stage: When the gas consumption is low and the pressure reaches the upper limit, the loading solenoid valve closes, the vent valve opens, the intake valve closes and releases the pressure in the oil and gas tank, entering the unloading operation. The machine will automatically shut down after continuous unloading for the set time. It will reload when the pressure drops to the lower limit value.
This system achieves closed-loop pressure control through the coordinated operation of components such as microcomputer controllers, pressure sensors, and solenoid valves, ensuring high efficiency, energy conservation, and stable gas supply.