Mutli-Pass Fluted Filter

摘要

Filter media, filter elements, and method of forming filter media and filter elements are provided. The filter media and filter elements require filtered fluid to pass through filter media twice. The filter media and filter elements generally relate to fluted or similar style filter media. The filter media is formed from convoluted sheets coupled to face sheets to form first and second sets of flutes. At least one of the flute sets includes inlet and outlet seals and the other one of the flutes includes an intermediate seal interposed between the inlet and outlet seals of the other flute set. This forces the fluid to pass through the filter media at least twice.

主权项

1. A fluted filter media comprising:
alternating layers of face sheet portions and convoluted sheet portions, each convoluted sheet portion has a first side that faces a first side of a first adjacent face sheet portion to form a plurality of first flutes therebetween and a second side that faces a second side of a second adjacent face sheet portion to form a plurality of second flutes therebetween; an inlet seal within the first flutes proximate an inlet end of the first flutes; an outlet seal within the first flutes proximate an outlet end of the first flutes, the outlet seal being axially spaced from the inlet seal along a longitudinal axis extending between an inlet end face of the fluted filter media and an outlet end face of the fluted filter media; an intermediate seal within the second flutes axially interposed between and axially spaced from the inlet and outlet seals along the longitudinal axis, the intermediate seal separating an inlet section of the second flutes from an outlet section of the second flutes; and wherein a downstream section of at least one of the convoluted sheet portions or the face sheet portions has a lower porosity than an upstream section of at least one of the convoluted sheet portions or the face sheet portions.