All-metal conical combined screw pump suitable for petroleum field

An all-metal conical combined screw pump suitable for petroleum field comprising:

• a stator, a rotor, a sleeve and a sucker rod;
• wherein the stator is provided with an internally threaded curved surface, and the rotor is installed in the stator and is provided with An external threaded curved surface matched with an internal threaded curved surface, the sleeve is connected to the stator, and the sucker rod is installed in the sleeve, characterized in that:
• the internal threaded curved surface and the external threaded curved surface are both tapered The spiral structure and the taper are the same, and the end of the inner threaded surface and the outer threaded surface with the larger radial size is adjacent to the sucker rod;
• the all-metal conical combined screw pump further comprises an elastic telescopic assembly, the elastic telescopic assembly comprising a movable part, a fixed part and an elastic part, the movable part is fixedly connected to the rotor, the fixed part is fixedly connected to the sucker rod, the movable part and the fixed part are slidly fitted in the up and down directions and can transmit torque to the sucker rod and the rotor, 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 be elastically contracted or elastically expanded along the sliding direction of the movable part.