Gas separation – Flexible or collapsible bag type – With flow line coupling means
Patent
1996-11-12
1998-07-28
Smith, Duane
Gas separation
Flexible or collapsible bag type
With flow line coupling means
553411, 55378, 55508, B01D 4602
Patent
active
057857245
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a filtering apparatus.
With the filtering apparatus of the kind which comprise at least one filter bag or filter sleeve it is common practice to provide a sealing ring around the periphery of the bag or sleeve.
GB 1603110 describes a filtering apparatus comprising a bag or sleeve having a sealing arrangement comprising a ring of felt having a radially outwardly directed flange. A spring steel or rubber ring is provided between the filter material and the felt ring. In use, the felt flange is received in an appropriately profiled rim of an aperture in a partition wall through which the bag is disposed. In practice, the flange is built up by appropriate application of strips of felt. Alternatively plastics, rubber rings, ropes and so forth may be used to build up the flange. Much time and effort is taken up in making these products and considerable skill is required.
SUMMARY OF THE INVENTION
The present invention has been made from a consideration of this problem.
According to the present invention there is provided a filtering apparatus comprising a filter bag or sleeve, a profiled resilient band connected to a part of the filter bag or sleeve, the profiled band being operative to sealingly engage, or being operative to cause the filter bag or sleeve to sealingly engage, the periphery of an aperture in a further body, wherein the profiled band has a one piece construction and wherein holes and/or slots are provided in the band.
Since the profiled band has a one piece construction, this eliminates the effort and skill involved in making such profiled bands from a number of separate parts. Accordingly the bands are less expensive to manufacture.
The resilience may be provided by using a resilient material, such as spring stainless steel or hard rubber. However, it is desirable that the bands are easily compressible by hand while being sufficiently resilient to retain their original shape when the compressive force has been removed. This is achieved by providing holes, slots or the like in the band, particularly in the projections forming the profiled regions of the band. In some embodiments of the invention it is desirable to provide open ended holes, slots or the like at one or both edges of the band.
The top of the filter bag or sleeve may be secured to the band by sewing, adhesive or welding. The band imposes a profile on the top of the filter fabric.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the present invention may be more readily understood specific embodiments thereof will now be described by way of example only with reference to the accompanying drawings in which:
FIG. 1 is a side elevation of one filter band in accordance with the invention; and
FIG. 2 is a side elevation of a second filter band in accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1 a filtration apparatus comprises a filter sleeve (not shown) secured to an endless sealing band 10. The band 10 is made from spring stainless steel, typically in the order of 0.38 mm thick. Two projections 11,12 extend radially outwardly from the band 10 so as to define a channel 13 therebetween. A number of slots 14a, 14b are provided in the band in the region of the projections so as to ensure that the projections are readily resiliently deformable. In some instances separate slots 14a are provided in the two projections and in other locations an elongated single slot 14b is provided which spans both projections. The band 10 is secured directly to the filter sleeve by sewing or welding.
In use the band is received in an aperture 15 defined by a cell plate 16. One of the projections is compressed by hand and inserted into the aperture 15 at which time the projection springs outwardly and the boundary of the aperture 15 is securely captured in the channel 13 defined between the projections 11 and 12. The channel 13 sealingly engages the boundary of the aperture 15 such that a dust tight seal is provided.
Referring to FIG. 2 a second spring
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Scapa Group PLC
Smith Duane
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