A filter medium (100) having an inflow side (110) and an outflow side (120) defining a flow direction (190). The filter medium comprises at least n consecutive layers Lx of fiber media, x varying from 1 to n, n being more than or equal to 2. L1 (101) is the layer of the n consecutive layers closest
A filter medium (100) having an inflow side (110) and an outflow side (120) defining a flow direction (190). The filter medium comprises at least n consecutive layers Lx of fiber media, x varying from 1 to n, n being more than or equal to 2. L1 (101) is the layer of the n consecutive layers closest to the inflow side of the filter medium and Ln (103) is the layer of the n consecutive layers closest to the -outflow side of the filter medium. For all layers Lx of the at least n consecutive layers, the ratio Hx/(kx*Ax) is substantially identical, wherein Hx is the average thickness of the layer Lx in flow direction, Ax is the average surface area of cross sections according to planes perpendicular to the flow direction, and kx is the permeability coefficient of this layer Lx. The fiber media of at least part of the layers of the filter medium comprises metal fibers.
대표청구항▼
1. A filter medium having an inflow side and an outflow side defining a flow direction, said filter medium comprising: at least n consecutive layers Lx of fiber media, x varying from 1 to n, n being more than or equal to 2, L1 being the layer of the n consecutive layers closest to the inflow side of
1. A filter medium having an inflow side and an outflow side defining a flow direction, said filter medium comprising: at least n consecutive layers Lx of fiber media, x varying from 1 to n, n being more than or equal to 2, L1 being the layer of the n consecutive layers closest to the inflow side of said filter medium and Ln being the layer of the n consecutive layers closest to the outflow side of said filter medium,wherein for all layers Lx of the at least n consecutive layers, the ratio Hx/(kx*Ax) is identical within measurement tolerances,wherein Hx is the average thickness of the layer Lx in flow direction, Ax is the average surface area of cross sections according to planes perpendicular to the flow direction, and kx is the permeability coefficient of this layer Lx,wherein Hx varies for each of the Lx layers, andwherein the fiber media of at least part of the layers of the filter medium comprises metal fibers. 2. The filter medium according to claim 1, wherein all n consecutive layers have an equal ratio of Hx/kx. 3. The filter medium according to claim 1, wherein the filter medium comprises at least one additional layer Lm of fiber media. 4. The filter medium according to claim 3, wherein the at least one additional layer Lm of fiber media is provided downstream in flow direction from the at least n consecutive layers Lx. 5. The filter medium according to claim 3, wherein the at least one layer Lm is a sintered layer. 6. The filter medium according to claim 1, wherein all layers have a equal cross sectional surface, being the surface of a cross section according to a plane perpendicular to the flow direction. 7. The filter medium according to claim 1, wherein said fiber media of at least part of the layers of the filter medium consists of metal fibers. 8. The filter medium according to claim 1, wherein said metal fibers are bundle drawn metal fibers. 9. The filter medium according to claim 1, wherein at least one of the layers comprises a sintered layer. 10. The filter medium according to claim 1, wherein each of n consecutive layers Lx comprises a non sintered layer. 11. The filter medium according to claim 1, wherein each of the at least n consecutive layers Lx comprises fibers, the fibers of each of said layers Lx have an equivalent diameter Dx, for which Dx≧Dx+1, for which 1≦x≦n, resulting in Hx varying for each of the Lx layers. 12. The filter medium according to claim 1, wherein all layers Lx of the n consecutive layers have a porosity in the range of 90% to 99%. 13. The filter medium according to claim 1, wherein at least one of the layers comprises a catalyst. 14. The filter medium according to claim 1, wherein said filter medium further comprises metal foam layers or porous medium layers comprising hollow metal spheres.
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이 특허에 인용된 특허 (16)
Strom-Olsen John O. (Montreal CAX) Rudkowski Piotr Z. (Pierrfond CAX), Apparatus and method for fabrication of metallic fibers having a small cross section.
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