Usually, screw compressor refers to twin-screw compressor. A pair of mutually meshed spiral rotors are arranged in parallel in the compressor main machine. Usually, the rotor with convex teeth outside the pitch circle (viewed from the cross section) is called male rotor or male screw; A rotor with concave teeth on the pitch circle (viewed from the cross section) is called a female rotor or a female screw. Generally, the male rotor is the active rotor, and the female rotor is driven by the male rotor to rotate. The ball bearings on the rotor make the rotor realize axial positioning and bear the axial force in the compressor. Tapered roller thrust bearings at both ends of the rotor make the rotor realize radial positioning and bear radial and axial forces in the compressor. The two ends of the compressor main engine are respectively provided with small holes with a certain shape and size, one of which is called a suction port for sucking air; The other one for exhausting air is called the exhaust port.
Screw compressor was invented by Lysholm, a professor at the Royal Swedish Institute of Technology, in 1934. Due to the limitation of design and manufacturing level, the development of screw compressor was slow before 1960s. In the early 1960s, the oil injection technology was introduced into the screw compressor, which reduced the requirement for the machining accuracy of the screw rotor profile, and at the same time had a favorable impact on the noise, structure and speed of the unit. At present, the oil-injection screw compressor has become the main model in pneumatic, refrigeration and air-conditioning industries, and it has occupied a leading position in the market among pneumatic devices with medium volume flow and refrigeration devices with medium refrigeration capacity. Tokat gaopai air compressor