Patent ID: 8382870
Filing Date: 2013-02-26
Classification: B01D

Abstract:
1. A self-cleaning air filter apparatus connected to an associated compressed air source comprising: a filter casing defining an interior therein; a filter element disposed within the filter casing and having an interior and an exterior thereof, whereby during a filtering cycle a negative pressure differential between the filter element interior and the filter element exterior draws airflow inward through the filter element during a filtering cycle and during a self-cleaning cycle a positive pressure differential between the filter element interior and the filter element exterior forces airflow outward through the filter element, a valve mounted to the filter casing and connected to the associated compressed air source for automatically and periodically releasing a pulse of compressed air into the filter element whereby dust is dislodged from the filter element exterior into the filter casing; and a selectively openable vent mounted to the filter casing for venting the pulse of compressed air from the filter casing to maintain a positive pressure differential between the filter element interior and the filter element exterior during the cleaning cycle, the vent including a frame and a blocking element mounted for reciprocation in relation to the frame.