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The ground driving device of direct drive screw pump oil extraction machine is used to extract oil by mechanical way in oil field and it is a kind of new high-efficiency and energy-saving oil extraction equipment. It keeps the underground part of screw pump unchanged and only replaces the ground driving part of three-phase asynchronous motor screw pump oil extraction machine to realize high-efficiency and energy-saving oil extraction. The ground driving device of direct drive screw pump oil extraction machine is mainly composed of three parts: permanent magnet synchronous motor (PMSM), mechanical seal unit and AC servo drive control system. The PMSM adopted by the ground driving device of direct drive screw pump oil extraction machine has the character of low speed and high torque, which quite suits the load characteristic of screw pump oil extraction machine and boasts the advantage of high-efficiency and energy-saving. The ground driving device of direct drive screw pump oil extraction machine abandons reducer and pulley, adds reversal brake mechanism and can realize the function of hot-line stop, outage brake and automatic tracking of load. Compared with the ground driving device of three-phase asynchronous motor screw pump oil extraction machine, one single well efficiency increases by about one third; its line loss saves 80%; its comprehensive energy-saving rate reaches more than 30%.
Ground Driving device for Direct Drive Screw Pump Oil Extraction Machine