GEROTOR FLUID DRIVE OR PUMP Russian patent published in 2007 - IPC E21B4/02 F01C5/04 

FIELD: drilling equipment, particularly fluid rotary type drive for oil and gas well drilling or screw pumps for oil production from wells.

SUBSTANCE: fluid drive or pump comprises hollow body, two-sectional multi-stage gerotor mechanism arranged in the body. Each section of gerotor mechanism inside the body has elastomeric facing provided with inner helical teeth and rotor arranged therein. The rotor has outer helical teeth. Number of rotor teeth is 1 less than that of the elastomeric facing. Elastomeric facing tooth twists and rotor tooth twists are proportional to number of teeth. Rotor axis is offset with respect to elastomeric facing axis by distance equal to half of radial tooth height. Two engaged sections of the body cooperate with rotor pair corresponding to above sections and create damping cavity inside the body. Rotor adapter connector is installed and secured between the first and the second rotors. The hollow body is composed of the first and the second sections with intermediate sub arranged in-between. Minimal number of turns of helical line defined by inner helical teeth in elastomeric facing and/or the second body surface is 1 greater than difference between number of teeth of elastomeric facing of the first and/or the second body section and, correspondingly, the first and/or the second rotor. Maximal number of turns of helical line defined by inner helical teeth of elastomeric facing of the first body section is 1 less than number of teeth of the first and/or the second rotor. Distance between teeth ends in elastomeric facing between the first and the second body sections is at least equal to helical line twist between ends of the first and the second rotor teeth.

EFFECT: increased service life, reliability and energy characteristics, elimination of transversal resonance oscillations of drive inside well under axial load applied thereto and changing during drive action on well face, increased fatigue endurance of elastomeric facing and decreased fluid drive costs.

5 cl, 4 dwg