PROBLEM TO BE SOLVED: To reduce trouble in maintenance work for a filter device and its cost while keeping its performance.SOLUTION: A filter device 10 comprises a cylindrical outer frame 20 having opening parts 25, 26 at one end side and the other end side respectively a filter hanging-down part 30 arranged inside the outer frame 20 to support an upper end part 100t of a filter material 100 positioned in a plane crossing a direction connecting the opening part 25 on the one end side and the opening part 26 on the other end side to hang down the filter material 100 a fixing frame 40 fixed to the inside of the opening part 25 on the one end side with respect to the filter material 100 and abutted against the outer peripheral part of the filter material 100 a moving frame 50 arranged at the other end side with respect to the filter material 100 and arranged to be movable in a direction moving close to or moving away from the fixing frame 40 so as to hold the outer peripheral part of the filter material 100 between it and the fixing frame 40 and a moving frame driving part 60 for moving the moving frame 50 with respect to the fixing frame 40 in a direction moving close to or moving away from the fixing frame.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】フィルタ装置としての性能を維持しつつ、メンテナンスの手間およびコストを低減する。【解決手段】フィルタ装置10は、筒状をなし、一端側と他端側にそれぞれ開口部25、26を有した外枠20と、外枠20の内側に設けられ、一端側の開口部25と他端側の開口部26とを結ぶ方向に対して交差する面内に位置するフィルタ濾材100の上端部100tを支持してフィルタ濾材100を吊下するフィルタ吊下部30と、フィルタ濾材100に対して一端側の開口部25の内側に固定され、フィルタ濾材100の外周部に突き当たる固定枠40と、フィルタ濾材100に対して他端側に配置され、固定枠40に対して接離する方向に移動可能に設けられ、固定枠40との間にフィルタ濾材100の外周部を挟み込む移動枠50と、移動枠50を固定枠40に対して接離する方向に移動させる移動枠駆動部60と、を備える。【選択図】図3
