Filtering apparatus
First Claim
1. A filter comprising a pre-pleated fabric filter bag having an open end and a closed end and side walls formed of adjacent pleats extending between said open end and closed end,an apertured plastics end cap integrally moulded with the open end of the filter bag, said end cap having an internal configuration of side-by-side grooves each of which receives a pleat of the filter bag, andan internal reinforcing cage detachably located within the filter bag, said cage extending into each of the pleats of the filter bag and corresponding portions of the end cap.
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Abstract
A filter comprises a 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 moulded 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 moulded 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.
The rectangular pleated fabric filter permits a substantially greater area of filter fabric within a given size of filtering apparatus, casing or housing than has been possible hitherto.
90 Citations
20 Claims
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1. A filter comprising a pre-pleated fabric filter bag having an open end and a closed end and side walls formed of adjacent pleats extending between said open end and closed end,
an apertured plastics end cap integrally moulded with the open end of the filter bag, said end cap having an internal configuration of side-by-side grooves each of which receives a pleat of the filter bag, and an internal reinforcing cage detachably located within the filter bag, said cage extending into each of the pleats of the filter bag and corresponding portions of the end cap.
- 14. A filter apparatus comprising a casing separated by a cell plate into a "dirty" air section and a "clean" air section or plenum, a plurality of filters formed from a fabric filter bag closed at one end and having at its other and open end a moulded aperture plastics end cap and an internal reinforcing cage disposed therein secured to an apertured cover plate abutting against the apertured plastics end cap, said cover plate having secured thereto an elongate Venturi nozzle, said filters mounted in the cell plate and extending through a cell thereof, and a pulse jet cleaning system comprising pulse jet air delivery tubes adapted to engage on the elongate Venturi nozzles of the internal reinforcement cage of each filter to secure the filter in position on the cell plate.
- 17. A method of forming a pre-pleated fabric filter bag having an open end, a closed end and a moulded apertured plastics end cap, comprising the steps of disposing the open end of the pleated filter bag in a mould around an internal former having a peripheral configuration of projections corresponding to the pleats of the filter bag, which former is surrounded by a wall defining the external configuration of the end cap of the filter bag, introducing between the wall and the former a fluent plastics material to make contact with the open end of the pleated filter bag, allowing the fluent plastics material to set and thereafter removing the pleated filter bag with its integral end cap from the mould.
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20. Apparatus for forming a pleated fabric filter bag having an integral apertured plastics end cap comprising a mold having a bottom wall, a former defining a pleated configuration around which the open end of a pleated fabric filter bag is disposed, a wall surrounding the former to define the outer periphery of the mold and thereby the end cap, and means for delivering fluent plastics material into the space between the former and wall to form the end cap integral with the pleated fabric filter bag.
Specification