Abstract: The current technology relates to a filter element having pleated filter media. The pleated filter media defines an elongate tubular structure having an inner passageway. The pleated filter media has outer pleat folds and inner pleat folds each extending from a first end to a second end of the elongate tubular structure. The filter element has no more than one elongate brace disposed in the inner passageway, extending between the first end and the second end. A plurality of support ribs are coupled to the elongate brace, where each support rib has a connector defining an interference-fit with the elongate brace. Each support rib partially defines the inner passageway and has an outer support surface that abuts a substantial portion of the inner pleat folds.
July 14, 2017
Date of Patent:
October 1, 2019
Donaldson Company, Inc., IFIL.USA, LLC
Jonathan G. Parsons, Philip Edward Johnson, John K. Falk, III
Abstract: A high efficiency, stepped-top cartridge filter with a separate flow transition insert for installation in a uniform circular or oblong hole of a baghouse tube sheet. The cartridge includes a tubular core supporting a tube of pleated filter media to form a pleat pack having a molded cap at its lower end A open-mouthed, molded top fitting includes an upper flange, a side wall and a stepped portion leading to the bore of the filter. The flow transition insert is pressed into the top fitting to create a seal with the hole in the tube sheet. The insert includes an aerodynamically contoured mouth leading to a bore corresponding to the bore of the filter and further defines an air passageway between the top fitting and the insert for supplying tertiary cleaning air to supplement the primary and secondary air flows during a cleaning cycle.
Abstract: A high efficiency unitary cartridge filter for installation with a separate sealing gasket in a generally uniform circular or oblong hole of a baghouse tube sheet. The cartridge includes a plastic or metal tubular core around which is wrapped elongate pleated filter media to form a pleat pack. The pleat pack is sealed at the lower end thereof by a molded cap. A molded upper fitting includes an aerodynamically contoured transition mouth comprising compound radii of curvatures and a bore which closely corresponds to the bore of the tubular core for improved cleaning power and increased pressure during a cleaning cycle and for reduced pressure drop during normal filtering operation. The molded top may optionally incorporate and bond with a metal collar for added structural integrity and may also incorporate electrical grounding elements for grounding a metal core to the baghouse tube sheet.