CENTRIFUGAL DEHYDRATOR

To stably add back pressure while easily adjusting the back pressure added to dewatering cake.SOLUTION: A centrifugal dehydrator is provided with a rotation body 2 having an outer barrel bowl 8 and an inner barrel screw provided with a blade member, a valve element 17 adjustably providing a width of a discharge passage 27, one group of disc spring 18 imparting elastic force to the valve element in the direction for reducing the width of the discharge passage 27 and a cylindrical support body 20 arranged so as to support the opposite side of the valve element of the one group of the disc spring 18 in the axial direction, in which the valve element 17 comprises a conical pat 45 and a cylindrical part 46, and the one group of disc spring 18 comprises a plurality of circular disc springs 37 having a diameter expansion part on the periphery, and the cylindrical part 46 is inserted into the inner peripheral side of the diameter expansion part, and the other end in the axial direction of the one group contacts with the conical part 45, and one end in the axial direction of the one group is arranged so as to contact with the support body 20, and the disc springs 37 on one end contact with the support body 20 in a surface of turning to one side in the axial direction of the diameter expansion part, and a place contacting with one end of the disc springs 37 of the support body 20 is a semicircular shape in a cross-sectional shape along the axial direction.SELECTED DRAWING: Figure 2 【課題】脱水ケーキに加える背圧の調整を容易としながら、安定して背圧を加える。【解決手段】外胴ボウル８と、羽根部材が設けられた内胴スクリューとを有する回転体２と、排出通路２７の幅を調整可能に設けられた弁体１７と、排出通路２７の幅を減少させる方向に弁体に弾性力を与える一群の皿バネ１８と、軸方向で一群の皿バネ１８の弁体とは反対の側を支持するように配置される、円筒形の支持体２０と、を備え、弁体１７は、円錐部４５と円筒部４６とを有し、一群の皿バネ１８は、拡径部を周囲に備えた複数の円形の皿バネ３７を有し、拡径部の内周側に円筒部４６が挿通され、一群の軸方向の他端が円錐部４５に接し、一群の軸方向の一端が支持体２０に接するように配置され、一端の皿バネ３７は、拡径部の軸方向一方側を向く面が支持体２０に接し、支持体２０の皿バネ３７の一端に接する箇所は、軸方向に沿う断面形状が半円状である遠心脱水装置を提供する。【選択図】図２