US Patent 11841018 All-metal conical combined screw pump suitable for petroleum field

An all-metal conical combined screw pump suitable for petroleum field includes: a stator, a rotor, a sleeve and a sucker rod, wherein the internal threaded curved surface and the external threaded curved surface are both tapered The spiral structure and the taper are the same; the all-metal conical combined screw pump further comprises a movable part, a fixed part and a elastic part, the movable part is fixedly connected to the rotor, the fixed part is fixedly connected to the sucker rod, one end of the elastic member abuts against the movable part or the rotor, and the other end abuts against the fixed part or the sucker rod, the elastic member can Elastic contraction or elastic expansion along the sliding direction of the movable part.