Gas separation: processes – Filtering – Plural separate media
Reexamination Certificate
1999-06-29
2001-06-12
Smith, Duane (Department: 1724)
Gas separation: processes
Filtering
Plural separate media
C055S341200, C055S378000, C055S502000, C055SDIG002, C210S450000, C210S452000
Reexamination Certificate
active
06245130
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field Of The Invention
This invention is directed to filters, filter systems, bag filters, bag filter systems and in one aspect, to sealed mounts for filters for such systems.
2. Description of Related Art
Filters, filter systems and bag filters are well known in the prior art. Many industrial filtering systems with bag filters are air pollution control situations to separate air borne particulate material from a gas or gas mixture such as air, most or all of the particulate material being retained in the filtering apparatus for collection and eventual discharge with the cleaned air being delivered to atmosphere or an air circulatory system.
Certain prior art bag filters are tubular bags of filtering fabric with straight walls and generally of elongate cross-section. Many have internal reinforcement to resist collapse during the passage of the air through them.
Typically bag filters are removably mounted on and/or secured to a mounting apparatus, frame or plate, with or without holding brackets on angle pieces.
Various prior art filter bags have a rigid holding member or ring to which the filter fabric is connected. The filter bag is emplaced through an opening in a mounting frame or structure and the rigid holding member or ring contacts and abuts the mounting frame or structure. It is possible for fluid directed to the filter bag to flow out between the mounting frame/holding member interface rather than into and through the filter fabric. Such leaks reduce filtration efficiency and result in pollution of the environment.
U.S. Pat. No. 4,746,339 discloses a filter with pleated fabric filter bag of generally rectangular configuration within which is removably disposed an internal reinforcing cage of wire or rigid plastics material. The pleated fabric filter bag has an open end and a closed end and at its open end there is molded integrally with the bag an apertured plastics end cap which has an internal configuration corresponding to the pleated fabric bag. The closed end of the bag is sealed either by the bag material or by an integrally molded imperforate plastics end cap. The filter can be disposed vertically or horizontally within the casing of a filtering apparatus and if disposed horizontally it can be stacked in vertical array.
U.S. Pat. No. 5,840,188 discloses a filter system with liquid filter housing and filter bag assembly includes a reticulated basket fitted within a housing chamber and supported by the housing, and a replaceable filter bag positioned within the reticulated basket. The filter bag includes a flexible flange which terminates with a bulbous lip which frictionally engages the housing to secure and seal the bag at the housing and basket.
There has long been a need for a bag filter system in which the leaks between the filter units and mounting apparatus are inhibited or eliminated. There has long been a need for such an apparatus which is simple, easily made, and easily installed. There has long been a need for a more efficient bag filter system.
SUMMARY OF THE PRESENT INVENTION
The present invention discloses, in one embodiment, a bag filter, a mount for such a filter, and a system with such filters and mounts.
The present invention, in certain embodiments, discloses a bag filter system with one or more bag filters removably emplaced in a mounting structure. A rigid support holding member, or ring of the bag filter abuts part of the mounting structure. A seal member, e.g. a sealing gasket, a sealing O-ring, or other sealing material is emplaced between the rigid support (or holding member) and the mounting structure to inhibit or eliminate fluid leakage between the interface of these two members. Filter fabric is connected to the rigid support, holding member, or ring.
In certain aspects, the seal member is secured to or formed integrally of the filter bag's rigid support, holding member, or ring. In other aspects, the seal member is secured to or formed integrally of the mounting structure. In other embodiments one or more seal members are used on both the rigid support, etc. and on the mounting structure. In certain embodiments a seal member on a rigid support contacts a seal member on a mounting structure for enhance leakage inhibition.
Any seal member of a system according to the present invention may be of any desired and suitable dimensions and configuration and may be made of any known suitable sealing material. The seal(s), filter(s), filter mount(s) and system(s) disclosed herein may be used with systems other than bag filter systems.
What follows are some of, but not all, the objects of this invention. Objects other than the specific objects stated below, additional objects and purposes will be readily apparent to one of skill in this art who has the benefit of this invention's teachings and disclosures. It is, therefore, an object of at least certain preferred embodiments of the present invention to provide new, useful, unique, efficient and nonobvious bag filter apparatus and bag filter mounts for bag filter systems.
An additional object of at least certain preferred embodiments of the present invention is the provision of such apparatuses and systems in which fluid leaks around filter mount parts are inhibited or eliminated;
A further object of the present invention is the provision of such mounts, filters, and systems which are easily installed and easily replaced; and
Another object of the present invention is the provision of such filters and systems useful in already existing mounts and housings, mounting frames, and mounting structures.
Certain embodiments of this invention are not limited to any particular individual feature disclosed here, but include combinations of them distinguished from the prior art in their structures and functions. Features of the invention have been broadly described so that the detailed descriptions that follow may be better understood, and in order that the contributions of this invention to the arts may be better appreciated. There are, of course, additional aspects of the invention described below and which may be included in the subject matter of the claims to this invention. Those skilled in the art who have the benefit of this invention, its teachings, and suggestions will appreciate that the conceptions of this disclosure may be used as a creative basis for designing other structures, methods and systems for carrying out and practicing the present invention. The claims of this invention are to be read to include any legally equivalent devices or methods which do not depart from the spirit and scope of the present invention.
The present invention recognizes and addresses the previously-mentioned problems and long-felt needs and provides a solution to those problems and a satisfactory meeting of those needs in its various possible embodiments and equivalents thereof. To one of skill in this art who has the benefits of this invention's realizations, teachings, disclosures, and suggestions, other purposes and advantages will be appreciated from the following description of preferred embodiments, given for the purpose of disclosure, when taken in conjunction with the accompanying drawings. The detail in these descriptions is not intended to thwart this patent's object to claim this invention no matter how others may later disguise it by variations in form or additions of further improvements.
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Maybee Philip D.
McClung Guy L.
McClung Guy
Prince Fred
Smith Duane
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