Wave filter with flexible tensioning members
First Claim
1. A filter for filtering fluids comprising a filter element (10) having longitudinal side edges and folded in a wave-shaped manner said filter element having bending lines (14) extending in a first transverse direction and substantially planar filter element folding portions (12) arranged therebetween where the successive folding portions (12) and bending lines define a wave-shape extending in a second longitudinal direction, the filter element (10) is able to be stretched and compressed in the second longitudinal direction, two flexible tensioning members are connected to the two side edges of the filter element extending in the second longitudinal direction which flexible tensioning members allow the filter element to be compressed, which flexible tensioning members when elongated under tension have a modulus sufficient to limit the stretching of the filter element (10) in the second longitudinal direction fixing said filter element folding portions (12) in the wave-shape, said flexible tensioning members comprising flexible tensioning bands (20) with their width being at least equal to the horizontal distance between two adjacent bending lines (14) with the flexible tensioning bands and said filter element formed of thermoplastic materials.
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Accused Products
Abstract
The filter system including a filter element arranged in wave or zigzag shaped folds and having flat filter element portions and intermediate bending lines. The longitudinal edges of the filter element are connected to tensioning bands. When the filter element is stretched, these tensioning bands are tensioned and in their tensioned condition fulfill a holding function for holding the filter element portions in the stretched condition of the filter element. Thus, no spacers are required on the filter frame for maintaining the stability of shape of the filter element.
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Citations
10 Claims
- 1. A filter for filtering fluids comprising a filter element (10) having longitudinal side edges and folded in a wave-shaped manner said filter element having bending lines (14) extending in a first transverse direction and substantially planar filter element folding portions (12) arranged therebetween where the successive folding portions (12) and bending lines define a wave-shape extending in a second longitudinal direction, the filter element (10) is able to be stretched and compressed in the second longitudinal direction, two flexible tensioning members are connected to the two side edges of the filter element extending in the second longitudinal direction which flexible tensioning members allow the filter element to be compressed, which flexible tensioning members when elongated under tension have a modulus sufficient to limit the stretching of the filter element (10) in the second longitudinal direction fixing said filter element folding portions (12) in the wave-shape, said flexible tensioning members comprising flexible tensioning bands (20) with their width being at least equal to the horizontal distance between two adjacent bending lines (14) with the flexible tensioning bands and said filter element formed of thermoplastic materials.
Specification