Hydraulic oscillator based on roller and impeller

The invention discloses an oscillator with drag reduction and increased speed and belongs to the fields of oil drilling and the like. According to the technical scheme, an upper joint, an outer shellbody and a lower joint are connected through screw threads in a threaded mode in sequence; a throttle valve plate and the upper joint are connected through screw threads in a threaded mode; the throttle valve plate and cylindrical pins are connected through a locking screw, the cylindrical pins are located between an impeller and the throttle valve plate; an impeller shaft, the impeller and an impeller shell are welded into a whole, series bearings are installed between the impeller shell and the outer shell body, the upper end and the lower end of the series bearings are positioned through aninner sleeve and an outer sleeve, and the lower end of the impeller shell makes contact with the upper end of an roller; and the roller is connected and fixed to a supporting cylinder through a thread, the supporting cylinder