Energy-saving start device of submersible screw pump unit

Abstract

The invention discloses an energy-saving start device of a submersible screw pump unit. The device consists of an enclosure and a rotor rotating freely in the enclosure; the rotor comprises a driving element and a driven element; the driving element and the driven element form a helical pair; the start device is connected in series between a prime unit of the submersible screw pump unit and a screw oil-well pump unit; the two ends of the enclosure are connected with the enclosure of the prime unit of the submersible screw pump unit and the enclosure of the screw oil-well pump unit respectively; the driving element is connected with an output shaft of the prime unit of the submersible screw pump unit; and the driven element is connected with the rotor of a screw oil-well pump. Through the invention, at the initial start stage of the prime unit of the submersible screw pump unit, axial displacement between the rotor and stator of the screw oil-well pump is generated, then the screw oil-well pump is started in the condition basically without static resistance moment, the capacity of the prime unit does not need to be increased, thus the operation efficiency of the submersible screw pump unit can be improved, and the advantage of the submersible screw pump in saving energy is brought into full play.

Description

technical field [0001] The invention relates to a submersible screw pump unit, in particular to an energy-saving starting device for a submersible screw pump unit. Background technique [0002] In the existing technology, the operating efficiency of the submersible screw pump unit should be significantly higher than traditional oil extraction equipment such as rod-pumped screw pumps or submersible centrifugal pumps. The power demand of the prime mover unit during the operation of the submersible screw pump unit It is very small, so it can save a lot of energy; but because the static resistance moment between the stator and rotor of the configured screw oil pump is significantly higher than the running resistance moment, it is difficult to start the screw oil pump unit. In order to overcome the difficulty of starting the submersible screw pump unit , the existing technology generally adopts a prime mover with a larger capacity. In this way, although the submersible screw pump...

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Problems solved by technology

[0002] In the existing technology, the operating efficiency of the submersible screw pump unit should be significantly higher than traditional oil extraction equipment such as rod-pumped screw pumps or submersible centrifugal pumps. The power demand of the prime mover unit during the operation of the submersible screw pump unit It is very small, so it can save a lot of energy; but because the static resistance moment between the stator and rotor of the configured screw oil pump is significantly higher than the running resistance moment, it is difficult to start the screw oil pump unit. In order to overcome the difficulty of starting the submersible screw pump unit , the existing technology generally adopts a prime mover with a larger capacity. In this way, although the submersible screw pump unit only needs to be equipped with a small-capacity prime mover during operation, it has to be equipped with a larger-capacity prime mover in order to be able to start normally. , thus wasting a large amount of electric energy, seriously affecting the energy-saving advantages of the electric submersible screw pump unit; hindering the expansion of the application field of the submersible screw pump

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