Flange-connected three-serew pump with gear transmission

The utility model relates to a flange-connected three-screw pump with gear transmission. A lining is arranged in a pump body, and the lining is with penetrated with mutually engaged drive screw rods and driven screw rods. The drive screw rods, the driven screw rods and the lining are formed into a plurality of mutually isolated hermetic chambers, and the high voltage ends of two driven screw rods are respectively provided with balance sleeves. A bearing box is provided with a return chute, and the driving screw rod are penetrated with double-row angular contact ball bearings and check rings used for shafts. Two driven screw rods have automatic hydraulic balance without extending ends, and the driving screw rods are assembled with the double-row angular contact ball bearings to bear large radial pressure; mechanical seal is not needed, and the bearings are directly lubricated via the leakage of medium needing to be conveyed. The flange-connected three-screw pump with gear transmission has the advantages of flow rate pressure without pulse, high efficiency, low noise, long service life and favorable sucking performance, and the flange-connected three-screw pump with gear transmission is particularly suitable for some specific working places.