Control of Air Bubble Content in Working Oil by Swirling Flow

抄録

Air bubbles mixed in the hydraulic oil of hydraulic power transmission systems causes deterioration of the dynamic characteristics of the system, component erosion, accelerated deterioration of the hydraulic oil, reduced heat dissipation, and vibration noise. In this paper, a method to controlling air bubble content by a swirling flow of working oil has been proposed and developed. The amount of air bubbles in the oil flowing out of a bubble separation device can be adjusted by controlling the opening and closing of the valve on a vent port of the device. The air bubble concentration exiting the output port of the bubble separation device is controlled by the opening time duration of the vent valve. The validity of the proposed method has been experimentally verified.