Patent ID: 6117273
Filing Date: 2000-09-12
Classification: D21D

Abstract:
A mechanical strainer for fibrous suspensions including:a rotor having a substantially vertical longitudinal axis and an upper base, including a central shaft and motorization means suitable to impart a rotation to the shaft;a filtering basket having a side surface being disposed externally to said rotor and coaxially therewith and having a plurality of openings formed in said side surface;an interspace defined between the rotor and said filtering basket;an outer casing for housing said filtering basket and said rotor including:a feeding chamber defined in an upper part of said casing for communicating the fibrous suspension to be treated with said annular interspace;a delivery chamber defined externally of said filtering basket, a delivery pipe for communicating between the feeding chamber and the outer environment;a waste chamber defined in a lower portion of said casing, communicating directly with said interspace, and a waste piping communicating the interspace with the outer environment, wherein said rotor has a plurality of diffusing ducts each one located between an inlet section in the upper base of said rotor defining said feeding chamber and an outlet section in the lateral surface of said rotor defining said interspace, said ducts for piping the fibrous suspension to be treated from said feeding chamber to said interspace,each of said diffusing ducts has a diverging way and is defined laterally by curved surfaces beginning from the respective inlet section through the diverging ways toward the respective outlet section, said outlet section having an area larger than the area of said inlet section.