Barrel type air filter circular cylinder type air filter

The utility model relates to an air filter, in particular to a cylinder-type air filter which is applied in aerodynamic devices such as combustion turbines, air blowers and the like and is used to remove dust. The cylinder-type air filter mainly comprises a filter body which is connected between two end covers through fluid sealant and is composed of a protective net, wherein a folded filter cartridge is arranged in the protective net. The cylinder-type air filter is characterized in that big concave points which are distributed with equal distance are arranged on an outside crease of the folded filter cartridge, small concave points which are distributed corresponding to the big concave points are arranged on an inside crease, the structure is adopted, the concave points on the creases support air passages between folded filter paper to prevent folded wood pulp filter paper from squeezing together mutually, the filtration resistance is reduced, and the service life of the filter is prolonged.