| 主权项 |
1. A filter device having an integrated bypass filter element, comprising:
a filter housing including:
an interior chamber;an air inlet port;an air outlet port;an auxiliary air inflow opening; a primary filter element arranged within the interior chamber, the primary filter element including:
a filter media forming a generally cylindrical, oval, rectangular or oblong filter media hollow body having an axially extending hollow interior circumferentially enclosing an outflow passage in an interior of the primary filter element, the filter media hollow body having:
an inlet flow face arranged on a radially exterior side of the filter media hollow body, the inlet flow face configured to receive air to be filter by the primary filter element;an outlet flow face arranged in the axially extending hollow interior of the primary filter element;wherein the fluid to be filtered flows radially through the filter media hollow body from the inlet flow face to the outlet flow face;a first end disk secured onto a first axial end of the filter media hollow body,
the first end disk having a central opening extending axially through the first end disk, forming an auxiliary inflow path opening extending from an exterior of the primary filter element into the hollow interior;wherein the primary filter element is configured such that a primary inflow path enters the primary filter element at the inflow face, is filtered by the primary filter element and reaches the outflow passage within the hollow interior; an ambient airflow restriction device closing the central opening such that auxiliary airflow entering through the central opening passes through the ambient airflow restriction device before reaching the hollow interior of the primary filter element; wherein the ambient airflow restriction device includes filter media and operates as the bypass filter element; wherein the ambient airflow restriction device is configured with a porous media having a significantly higher pressure drop at a given flow rate relative to a pressure drop in the primary filter element from equivalent airflow rate in the primary inflow path, the significantly higher pressure drop operable to limit or prevent airflow through the auxiliary inflow path during normal operation; wherein, when the primary inflow path is obstructed, the ambient airflow restriction device operates to provide auxiliary airflow into the outflow passage, bypassing the filter media of the filter media hollow body. |
