FIELD: screw compressors. SUBSTANCE: both four-tooth and six-tooth rotors have symmetrical sections of screws in end section. Profiles are made by epicycloid for four-tooth rotor and mating curves for six-tooth rotor. Ridges of helical surfaces are provided with semi-circular bores, inner cylindrical surface of housing is provided with mating semi-circular bores. EFFECT: enhanced reliability. 6 dwg
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