US 12,440,793 B2
Pleated filter element for air filter
Fredrik Seger, Rönninge (SE); Richard Ringström, Dalsöfors (SE); Kenny Hedlund, Trosa (SE); and Mageshvaran Muthu Krisnan, Parit (MY)
Assigned to Camfil AB, Stockholm (SE)
Appl. No. 17/782,155
Filed by Camfil AB, Stockholm (SE)
PCT Filed Dec. 14, 2020, PCT No. PCT/EP2020/085978
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2021/122455, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 1951541-0 (SE), filed on Dec. 20, 2019.
Prior Publication US 2023/0001342 A1, Jan. 5, 2023
Int. Cl. B01D 46/00 (2022.01); B01D 46/121 (2022.01); B01D 46/52 (2006.01); B01D 46/56 (2022.01)
CPC B01D 46/522 (2013.01) [B01D 46/0005 (2013.01); B01D 46/121 (2022.01); B01D 46/521 (2013.01); B01D 46/56 (2022.01)] 22 Claims
OG exemplary drawing
 
1. A V-type air filter comprising:
at least one pair of pleated filter elements arranged in a V configuration in a casing,
wherein said pleated filter elements comprise:
a pleated filter media comprising a major upstream face and a major downstream face and comprising a plurality of oppositely-facing pleats extending between said major upstream face and said major downstream face such that the pleated filter media comprises a first corrugated edge and a second corrugated edge and a first noncorrugated edge and a second noncorrugated edge, and
wherein said casing includes channels adapted to enclose the corrugated and noncorrugated edges of the filter elements, and in which the corrugated and noncorrugated edges are inserted and sealed, said channels having a depth and one or more outside walls, and
wherein the pleated filter media comprises:
a main pleat section extending between a major upstream face and a major downstream face, said major upstream face and said major downstream face being arranged flush with the outside walls of the channel enclosing the noncorrugated edges of the filter elements, wherein the pleat height is the same for all pleats in the main pleat section and corresponds to the distance between said major upstream face and said major downstream face; and
a first edge pleat section at the first noncorrugated edge, wherein the length of the first edge pleat section corresponds to the depth of the channel in which it is to be inserted and sealed, and is 1-25% of the total length of the pleated filter element between the first noncorrugated edge and the second noncorrugated edge,
wherein the maximum pleat height in the first edge pleat section is lower than the maximum pleat height in the main pleat section, and wherein reduced pleat height in the first edge pleat section allows the first edge pleat section to fit into the channel and allows for the size of the channels in the casing to be reduced, thereby reducing obstructions of the air flow path caused by the filter casing and leading to a lower overall pressure drop.