DOWNHOLE MOTORS AND PUMPS WITH ASYMMETRIC HELICAL TEETH Russian patent published in 2017 - IPC E21B4/02 F03C2/08 F04C2/107 

FIELD: drilling of soil or rock.

SUBSTANCE: group of inventions relates to drilling. Device for use in well comprising stator, including helical tooth, having profile formed along stator inner surface; and rotor arranged in stator and including helical tooth, having profile formed on rotor outer surface, wherein rotor helical tooth profile is made asymmetric and rotor helical tooth has first and second sides so, that first side geometry forms loading surface, and second side geometry forms sealing surface.

EFFECT: enabling improving engine operating characteristics.

18 cl, 6 dwg