US 12,643,065 B2Granted

Filter systems with filter bag assemblies including filter bags with radial seal gaskets

AssigneeDonaldson Company, Inc.

InventorsStephan A. Graham, Mathijs Verstraete, David V. Gutman, Massimo Movia, Bart Catoor, Gert Proost, Gabriel J. Safarian, Steven A. Johnson

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Abstract

Filter systems with filter bag assemblies including filter bags with gaskets configured to form radial seals, as well as corresponding methods of assembling and using the same, are described herein. The filter systems, filter bag assemblies, and filter bags with gaskets may be used in filter systems to remove particulate matter from air or other gases. Methods of using the filter systems and methods of assembling the filter bags on filter service cages in the filter bag assemblies are also described.

Claims24

Dependent claims

An air filter system comprising:

a tubesheet separating a housing into a dirty air chamber and a clean air chamber, wherein the tubesheet comprises an aperture placing the dirty air chamber in fluid communication with the clean air chamber, and wherein the housing comprises an access panel located directly across the dirty air chamber from the tubesheet;
a filter bag assembly configured for installation in and removal from the dirty air chamber through an access port in the access panel, the filter bag assembly comprising:
a service frame comprising a support ring and a distal end strut attached to the support ring by an extension strut extending between the distal end strut and the support ring, the support ring comprising a leading edge facing away from the distal end strut,
a filter bag comprising a bag opening and a closed end such that the filter bag comprises flexible filter sheet material defining an interior volume of the filter bag, the filter bag defining a filter bag axis extending through the bag opening and the closed end, and
a pocket gasket extending around and attached to a perimeter of the bag opening of the filter bag, the pocket gasket comprising:
an external surface facing away from the filter bag axis, the external surface extending around a perimeter of the pocket gasket,
an internal surface facing the filter bag axis, the internal surface extending around the perimeter of the pocket gasket,
a forward edge located distal from the closed end of the filter bag and a trailing edge located between the forward edge and the closed end of the filter bag,
a pocket formed between the external surface and the internal surface, the pocket comprising a pocket opening and a forward end, wherein the forward end is located between the pocket opening and the forward edge of the pocket gasket,
a plurality of tab apertures extending through the pocket gasket from the forward end of the pocket through the forward edge of the pocket gasket,
wherein the leading edge of the support ring is positioned in the pocket and proximate the tubesheet and wherein the extension strut extends away from the tubesheet towards the access panel when the filter bag assembly is installed in the dirty air chamber;
a receiver surrounding the aperture, wherein the pocket gasket of the filter bag assembly engages the receiver to form a radial seal between a sealing surface on the receiver and the pocket gasket such that air passing through the aperture in the tubesheet must pass through the filter bag when entering or leaving the dirty air chamber through the aperture.

9 more elements

A filter bag comprising:

a tubular body extending from a bag opening to a closed end, the tubular body defined by flexible filter sheet material defining an interior volume of the filter bag between the bag opening and the closed end, the tubular body defining a filter bag axis extending through the bag opening and the closed end;
and
a gasket attached to the tubular body, the gasket extending around and attached to a perimeter of the bag opening, the gasket comprising:
an external surface facing away from the filter bag axis, the external surface extending around a perimeter of the gasket,
an internal surface facing the filter bag axis, the internal surface extending around the perimeter of the gasket,
a forward edge located distal from the closed end of the tubular body and a trailing edge located between the forward edge and the closed end of the tubular body,
a pocket formed in the gasket between the external surface and the internal surface, the pocket comprising a pocket opening and a forward end, wherein the forward end is located between the pocket opening and the forward edge of the gasket, the pocket configured to receive a support ring extending around the perimeter of the bag opening, wherein the pocket opening opens into the interior volume of the filter bag, and wherein the pocket opening faces the closed end of the tubular body,
and wherein the gasket comprises a plurality of tab apertures extending through the gasket from the forward end of the pocket through the forward edge of the gasket.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/085,308Filed 20 Dec 2022 · us provisional application
Priority: 21 Dec 2021
Published: US 2023/0191303 A122 Jun 2023
Granted: 2 Jun 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B01D 46/02
Filters or filtering processes specially modified for separating dispersed particles from gases or vapours: particle separators, e.g. dust…
B01D 46/04
Particle separators, e.g. dust precipitators, having hollow filters made of flexible material: cleaning filters
B01D 46/0006
Mounting of filtering elements within casings, housings or frames: filter elements or cartridges installed in a drawer-like manner
B01D 46/06
Particle separators, e.g. dust precipitators, having hollow filters made of flexible material: with means keeping the working surfaces flat