Compact flexible filter assembly for a fluid bed granulator,...

B - Operations – Transporting – 01 – D

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Details

B01D 46/02 (2006.01) B01D 46/04 (2006.01) F26B 25/00 (2006.01)

Patent

CA 2218757

A novel filter assembly (8) for fluid bed granulator, dryer or coater machines (1) which utilize a rigid filter frame (10) consisting of a solid bottom plate (4), a donut-shaped top plate (3) with said top and bottom plates being connected by side rods (5) to form a cage-like frame work. Said rigid filter frame (10) is reusable, around which a pleated (13) reusable flexible filter bag (9) is fitted and clamped (7); top support plate (2) and mounting plate (12) are connected by a threaded rod (6) with a sealing gasket (11) between them. Said filter assembly (8) is located inside said fluid bed machine's exhaust path so that when the process air is drawn through the filter bag (9) it forms around and through the filter frame (10) to cause a pleated (13) accordion effect in such a way that it allows the use of flexible filter media in a configuration that takes less space, gives better support to prevent tearing, is much easier to change and clean between product production run and can be continuously cleaned during operation by alternately providing reverse air flow through it.

Nouvel ensemble filtre (8) conçu pour une enrobeuse, un séchoir ou un granulateur à lit fluidisé (1), comprenant un châssis rigide (10) constitué par une plaque inférieure pleine (4), par une plaque supérieure (3) en forme d'anneau, lesdites plaques inférieure et supérieure étant reliées par des tiges latérales (5), de manière à constituer un bâti en forme de cage. Le châssis rigide (10) de filtre est réutilisable et un sac filtrant (9) souple, réutilisable et plissé (13) est fixé par serrage (7) autour dudit châssis; une plaque de support supérieure (2) et une plaque de montage (12) sont reliées par une tige filetée (6) comportant un joint d'étanchéité (11) situé entre lesdites plaques. Cet ensemble filtre (8) se trouve à l'intérieur du trajet d'évacuation de la machine à lit fluidisé, de telle manière que, quand l'air de processus est aspiré à travers le sac filtrant (9), il influence la forme dudit sac dans le châssis rigide (10), et crée un effet accordéon sur les plis (13) dudit sac et permet d'utiliser un moyen filtrant souple selon une configuration qui économise l'espace, améliore la qualité du support afin d'empêcher les déchirures, facilite le remplacement et le nettoyage entre les cycles de production, ainsi que le nettoyage en continu pendant le fonctionnement au moyen d'un flux d'air dont le sens est alterné, qui traverse le filtre.

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