Screw air compressor is composed of screw head, motor, oil-gas separation barrel, cooling system, air conditioning system, lubrication system, safety valve and control system. The whole machine is installed in a box and is self-contained. It can be directly placed on the flat cement ground without fixing it on the foundation with anchor bolts. Screw head is a double shaft volumetric rotary compressor head. A pair of high-precision main (male) and auxiliary (female) rotors are installed horizontally and parallel inside the casing. The main (male) rotor has 5 teeth and the auxiliary (female) rotor has 6 teeth. The diameter of the main rotor is large and the diameter of the auxiliary rotor is small. The teeth form a spiral shape and they mesh with each other. Both ends of the main and auxiliary rotors are respectively supported and positioned by bearings. During operation, the motor directly carries the main rotor through the coupling. Since the two rotors mesh with each other, the main rotor directly drives the auxiliary rotor to rotate together. The coolant is directly injected into the meshing part of the rotor through the nozzle at the lower part of the compressor casing and mixed with air to take away the heat generated by compression and achieve the cooling effect. At the same time, a liquid film is formed to prevent direct metal to metal contact between rotors and close the gap between rotors and casings. The injected coolant can also reduce the noise caused by high-speed compression.
