GEROTOR MACHINE Russian patent published in 2009 - IPC E21B4/02 

FIELD: engines and pumps.

SUBSTANCE: invention is related to gerotor mechanisms of screw downhole motor for drilling of oil and gas wells and may also be used in screw pumps for oil production and fluid pumping. Gerotor machine comprises gerotor mechanism that contains stator (1) with internal spiral teeth, rotor (2) with external spiral teeth, number of which is less by one than number of internal spiral teeth of stator (1). Rotor (2) of gerotor mechanism is separated into several modules at termination of spiral lines T₂ steps. Modules (3) and (4) are coaxially combined by means of adapter (5). Axis is displaced at angle ϕ at termination of T₂ step of spiral lines relative to static stator, and relative to axis of module O₁O₂ it is turned at angle ϕ₁. Angles ϕ and ϕ₁ are determined by the following expression: where Z₁ Z₂ - number of stator and rotor teeth.

EFFECT: extension of gerotor machine service life, preservation of its power characteristics with worn out working elements (RO), by design modification of gerotor mechanism.

3 dwg