Filter systems with filter bag assemblies including filter bags with radial seal gaskets
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.
1 . 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.
2 . A system according to claim 1 , wherein the pocket gasket is compressed between the support ring and the sealing surface of the receiver.
3 . A system according to claim 1 , wherein the leading edge of the support ring and the pocket of the pocket gasket are located within the receiver such that the radial seal is formed within the receiver and an exterior surface of the support ring.
4 . A system according to claim 1 , wherein the receiver is located within the pocket gasket such that the radial seal is formed within the pocket gasket and outside of the receiver at a location between the forward edge of the pocket gasket and the closed end of the filter bag.
5 . A system according to claim 1 , wherein the service frame comprises a filter bag assembly length measured along the filter bag axis between the leading edge of the support ring and the distal end strut that is great enough to prevent disengagement of the pocket gasket from the sealing surface of the receiver when the access port is closed.
6 . A system according to claim 1 , wherein the support ring, the distal end strut, and the extension strut of the service frame are located in the interior volume of the filter bag.
7 . A system according to claim 1 , wherein the system comprises a yoke attached to the tubesheet, the yoke extending into the dirty air chamber from a dirty air chamber side of the tubesheet, wherein a junction between the yoke and the tubesheet is located between the aperture and the sealing surface of the receiver, and wherein, when the filter bag assembly is installed in the dirty air chamber, the yoke and the service frame are located in the interior volume of the filter bag.
8 . A system according to claim 7 , wherein the service frame and the yoke define a handle gap between the service frame and the yoke proximate the closed end of the filter bag, wherein the handle gap is located between the closed end of the filter bag and the yoke, the handle gap configured to facilitate manual grasping of the service frame and the filter bag for removal of the filter bag assembly from the dirty air chamber.
9 . A system according to claim 1 , wherein the leading edge of the support ring is shaped such that a distance between the leading edge of the support ring and the tubesheet changes when moving around a perimeter of the support ring.
10 . A system according to claim 1 , wherein the leading edge of the support ring comprises a plurality of retention tabs extending away from the closed end of the filter bag, and wherein the plurality of tab apertures are configured to receive the retention tabs.
11 . A system according to claim 1 , wherein the filter bag comprises a handle attached to the closed end of the filter bag, wherein the closed end is located between the bag opening and the handle when moving along the filter bag axis.
12 . A system according to claim 1 , wherein the filter bag of each filter bag assembly of a plurality of filter bag assemblies comprises a handle attached to the closed end of the filter bag, wherein the closed end is located between the bag opening and the handle when moving along the filter bag axis.
13 . 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, and
a plurality of tab apertures extending through the gasket from the forward end of the pocket through the forward edge of the gasket.
14 . A filter bag according to claim 13 , wherein the pocket opening opens into the interior volume of the filter bag.
15 . A filter bag according to claim 13 , wherein the pocket opening faces the closed end of the tubular body.
16 . A filter bag according to claim 13 , wherein the pocket comprises a pocket depth measured along the bag axis between the forward end of the pocket and a reference plane oriented transverse to the bag axis, wherein the pocket depth varies when moving around the perimeter of the gasket.
17 . A filter bag according to claim 13 , wherein the gasket comprises a gasket depth measured along the bag axis between the forward edge and a reference plane oriented transverse to the bag axis, and wherein the gasket depth varies when moving around the perimeter of the gasket.
18 . A filter bag according to claim 13 , wherein the gasket comprises a gasket-pocket depth measured along the bag axis between the forward end of the pocket and a reference plane, wherein the gasket-pocket depth varies when moving around the perimeter of the gasket.
19 . A filter bag according to claim 13 , wherein the filter bag comprises a handle attached to the closed end of the tubular body, wherein the closed end is located between the bag opening and the handle when moving along the filter bag axis.
20 . 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.
21 . A filter bag according to claim 20 , wherein the pocket comprises a pocket depth measured along the filter bag axis between the forward end of the pocket and a reference plane oriented transverse to the filter bag axis, wherein the pocket depth varies when moving around the perimeter of the gasket.
22 . A filter bag according to claim 20 , wherein the gasket comprises a gasket depth measured along the filter bag axis between the forward edge and a reference plane oriented transverse to the filter bag axis, and wherein the gasket depth varies when moving around the perimeter of the gasket.
23 . A filter bag according to claim 20 , wherein the gasket comprises a gasket-pocket depth measured along the filter bag axis between the forward end of the pocket and a reference plane, wherein the gasket-pocket depth varies when moving around the perimeter of the gasket.
24 . A filter bag according to claim 20 , further comprising a handle attached to the closed end of the tubular body, wherein the closed end is located between the bag opening and the handle when moving along the filter bag axis.