PROBLEM TO BE SOLVED: To provide a rotary valve, suitable for, in particular, a quick exhaust valve for an automatic door opening/closing device of a railway vehicle, capable of preventing fluid leakage by increasing a primary-side seal face pressure when pressure fluctuation occurs in valve closing, surely preventing fluid leakage by increasing the seal face pressure by applying the primary-side pressure to the whole face of a seal member in valve closing, switching a flow channel while improving operability by securing high sealability and low torque property in opening/closing a valve element, and quickly exhausting pressure air in a short exhaust time from an exhaust hole of a large diameter while entirely miniaturized and reducing the number of components.SOLUTION: Inflow/outflow ports 10, 11, and an exhaust port are formed on a valve element accommodation portion 16 having a spherical portion 15 formed on a part of an inner periphery of a body 2, through-openings 30-32 communicated with the inflow/outflow ports or the exhaust port, and a mounting groove 33 are formed on the valve element 3 having a spherical part 28 rotatably mounted on the valve element accommodation portion 16, one of the inflow/outflow ports and the exhaust port is sealed and closed by the seal member 5 mounted on the mounting groove, and a seal face pressure is improved by utilizing a back pressure applied to a back face side 5b.SELECTED DRAWING: Figure 2
【課題】弁閉時に圧力変動が生じた場合には一次側シール面圧を高めて流体漏れを防止し、弁開時は一次側圧力がシール部材全面に加わりシール面圧を高めて流体漏れを確実に防止し、弁体開閉時には高シール性、低トルク性を確保して操作性を向上しつつ流路を切換え可能に設け、全体のコンパクト化や部品点数の削減を図りつつ大口径の排気孔で短い排気時間で圧力空気を急速排気し、特に鉄道車両の自動扉開閉装置用の急速排気弁に適した回転弁を提供する。【解決手段】ボデー2内周の一部に形成した球面部15を有する弁体収納部16に流出入口10、11、排気口を形成し、弁体収納部16に回転自在に装着した球状面部分28を有する弁体3に流出入口又は排気口と連通する貫通口30〜32、装着溝33を形成し、装着溝に装着したシール部材5で何れか1つの流出入口又は排気口を密封閉止し、背面側5bに付与された背圧を利用してシール面圧を向上させた。【選択図】図2
ROTARY VALVE AND QUICK EXHAUST VALVE FOR RAILWAY VEHICLE USING THE SAME
回転弁とこれを用いた鉄道車両用急速排気弁
2017-02-02
Patent
Electronic Resource
Japanese
ROTARY VALVE AND QUICK EXHAUST VALVE FOR RAILWAY VEHICLE USING THE SAME
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