FINE FILTER BASED ON FIBROUS FILTER MATERIALS Russian patent published in 1997 - IPC

FIELD: filtering equipment. SUBSTANCE: filter unit having a set of filter elements with central undulated section formed by a group of parallel passages for air inlet and outlet, also flat frontal panels located over its length and adjacent to it at side of air inlet and outlet, and two side sections adjacent to central undulated section and flat frontal panels over their width. Adjacent undulated filter elements are turned relative to each other. Side sections are located in undulated filter elements in planes which are at right or obtuse angle with respect to planes of flat frontal panels. Length of side sections is equal to or larger than total width of central undulated section and flat frontal panels. Width of side sections if equal to or larger than double height of central undulated section, and adjacent parts of flat frontal panels and side sections of adjacent undulated filter elements are unsplitably connected to each other. Adjacent undulated filter elements are turned relative to each other by 180^o around axis perpendicular to flats of frontal panels. Side sections of adjacent filter elements are unsplitably connected to each other at distances equal to height of undulations of central sections with forming continuous hermetic side walls of filter unit. Filter module has filter unit based on a set of undulated filter elements and housing components made in the form of flat strips and their length is equal to length of undulated filter elements and width is equal to or larger than width of undulated elements and filter unit and they are hermetically attached to outer side of filter unit at planes parallel to planes of frontal panels of filter elements in filter unit. Filter with module based on filter unit and housing components and mounting parts made in the form of attached flanges of protruding blade strips or closed grooves for sealant, comprises a group of filter modules hermetically connected to each other and having common mounting part located over perimeter of filter. Filter can have several modules located so that planes of filter elements in unit of adjacent modules are interperpendicular and has additional mounting parts consisting of threaded studs, anchor bolts or flat shackles hermetically fixed in joints between filter modules. EFFECT: high efficiency. 13 cl, 62 dwg