TWIN SCREW AIR COMPRESSOR
Very soon the twin screw air compressor acquired the reputation of a machine with reliable performance. However, the break-through did not occur until 1960, in conjunction with intensive tests to inject oil and other liquids into the compression spaces in order to be able to cope with the compression of impure and explosive gases. Heinrich Krigar resided in Hannover and his illustrations clearly show a two lobe rotor assembly, each rotor having the same profile as each other. In fact the rotor configuration resembles the Roots design, exhibited in Europe during 1867, with the exception that the rotors in the Krigar twin screw air compressor twist through an angle of 180 deg along their length.
twin screw air compressor typify the high-efficiencydesign for which Copeland is famous. Theirtotally new profile matches the features of 5:6 geometry with the stability and high tipspeed of 5:7 technology. Combined with animproved tip seal and smaller blowhole, thesedesign innovations offer maximum efficiencyand refrigeration capacity. Extremely accuratemanufacturing processes take full advantage of the new geometry and guarantee consistent quality. A theoretical model is proposed in this paper in order to study the performance of oil-less and oil-injected twin screw air compressors. Based on this model, a computer simulation program is developed and the effects of different design parameters including rotor profile, geometric clearance, oil-injected angle, oil temperature, oil flow rate, built-in volume ratio and other operation conditions on the performance of twin screw air compressors are investigated.
twin screw air compressors are used to supply high pressure air for a number of different applications. In this design, two meshing rotors are turning in opposite directions inside a housing. On the suction side of the twin screw compressor, air is drawn into the suction opening in the housing and into the cavity between the housing wall and the two rotors. The cavity increases in size and moves forward, drawing in more air until the cavity has passed the suction opening in the housing.
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