可視化技術を用いた油圧用ボール弁の改良

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In the present study, we succeeded in improving an oil hydraulic ball valve using the visualization technique, in order to prevent the vibration, cavitation and the noise of the ball valve. The valve body outside of the ball is made of transparent acrylic resin in order to observe the cavitation bubbles and the motion of the ball. The cavitation cloud near the orifice in the valve, and the movements of the ball, the ball support and the spring in the three dimensions during cavitation and the vibration of the ball are observed using a commercially available digital video camera, a high-speed video camera and X-rays. The results of the flow analysis using CFD (Computational Fluid Dynamics) technique are also considered to understand the relation between the cavitation phenomenon and the lateral vibration of the ball for the conventional valve. After the flow phenomenon and the vibration of the ball inside the conventional ball valve are investigated in detail, a new type of the ball valve without the lateral oscillation is designed to obtain good performance. It is found that there is no cavitation bubble and no cavitation noise for one of the new types of the valve. The flow structure in the two developed valves in the present study is also investigated in order to understand the reason for the good performance for the one of two valves by the mumerical simulation using the vortex method. In the present work, we propose one of the useful methods for improving an oil hydraulic control valve using the visualization technique.
社団法人　日本フルードパワーシステム学会の論文

可視化技術を用いた油圧用ボール弁の改良

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