FIELD: engines and pumps.
SUBSTANCE: invention relates to eccentric screw pumps or eccentric screw engines. The proposed eccentric screw pump or engine comprises stator with helical via-bore, helical rotor fitted to the stator bore and incorporating a helically-deformed pipe made up of inner layer 44 and at least one outer layer 45, both pressure-treated to make a helical shape, and a connecting head rigidly coupled with the rotor. The aforesaid outer layer 45 is made of material other than that of inner layer 44.
EFFECT: higher erosion resistance of rotor.
32 cl, 7 dwg
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