SCREW HYDRAULIC MACHINE WITH VARIABLE TEETH TENSION Russian patent published in 2016 - IPC E21B4/02 F01C1/107 F04C2/107 

FIELD: machine building.

SUBSTANCE: invention relates to screw gerotor hydraulic machines used as screw propellers, wherein rotation of rotor with bit is performed by pumped feeding fluid, for drilling oil and gas wells, as well as screw pumps for oil production, multiphase pumps for pumping gas-liquid mixtures, and can be applied to screw propellers or general purpose pumps. Screw hydraulic machine includes stator with internal screw teeth, coated by resilient material, for example rubber, and rotor with external spiral teeth, number thereof is by one less than number of stator teeth. Rotor axis is shifted relative to stator axis on eccentricity value equal to half of radial height of teeth. Pitch of rotor teeth is equal to pitch of stator teeth, and passages of screw teeth of rotor and stator are proportional to their numbers of teeth. Teeth of rotor and/or stator at its length have harmonic variation of inclination angle of helical line. Proposed reamer one turn of similar points of teeth surfaces on plane, for example of teeth apices, represents extended sinusoids equally spaced at pitch of teeth in direction of hydraulic machine axis. Length of sinusoids is multiple to one of their period, and at least is equal thereto, and their amplitude is equal to 0.001 to 0.25 of radial height of teeth. Higher efficiency of drilling is provided in operation mode of engine. Increased reliability of starting up hydraulic machine after its stop in well.

EFFECT: longer life of hydraulic machine at operation both as motor, and pump.

1 cl, 9 dwg