FIELD: machine building.
SUBSTANCE: rotary screw machine includes housing 3, drive 1 and driven 2 rotors located in it. Screw surfaces of rotors 1, 2 have two adjacent sections which differ by strokes of coils, within the limits of each of which the surface profile remains constant, binding numbers of screw entries, external radii, length and profiles of screw surfaces of rotors.
EFFECT: higher capacity and efficiency of machine and lower noise level.
3 cl, 4 dwg
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