VALVE OPENING DETECTOR AND VALVE POSITIONER

• Main Author: INOUE KAZUHISA
• Format: Patent
• Language: English; Japanese
• Published: 29.09.2023
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

To reduce a risk of damage of components used for detecting valve opening, and suppress wrong detection of the valve opening and deterioration in detection accuracy of the valve opening due to influence of ambient magnetism.SOLUTION: A valve opening detector 20 is a valve opening detector 20 that detects the valve opening of the valve 90, and includes: an encoder 21 that comprises a scale 22 fixed to a member that has a light and dark pattern and is displaced in conjunction with change in the valve opening of the valve 90, and an optical sensor 23B facing the scale 22 and reading a part of the light and dark pattern; and a valve opening derivation circuit 25 that derives the valve opening of the valve based on the part of the light and dark pattern read by the optical sensor 23B.SELECTED DRAWING: Figure 3 【課題】弁開度の検出に使用する部品の損傷のリスクを低減するとともに、周囲の磁気の影響による弁開度の誤検出及び弁開度の検出精度の低下を抑制する。【解決手段】弁開度検出器２０は、バルブ９０の弁開度を検出する弁開度検出器２０であって、明暗パターンを有し、バルブ９０の弁開度の変化に連動して変位する部材に固定されたスケール２２と、スケール２２と対向し、明暗パターンの一部を読み取る光センサ２３Ｂと、を備えるエンコーダ２１と、光センサ２３Ｂにより読み取られた明暗パターンの前記一部に基づいて前記バルブの弁開度を導出する弁開度導出回路２５と、を備える。【選択図】図３