| 主权项 |
1. A filter device comprising:
a filter housing cover defining a receiving chamber, and an annular filter element arranged within the receiving chamber, a housing including a threaded dome arranged centrally in the housing to which the filter housing cover is rotatably secured, at least one intermediate piece arranged between the filter housing cover and the housing when the filter housing cover is secured to the housing, wherein the intermediate piece defines a cap having a surrounding wall enclosing an axially open cavity, a housing-side inlet duct in communication with an untreated side of the annular filter element, and a housing-side outlet duct in communication with a clean side of the annular filter element, a housing-side drainage duct arranged in the housing and through which the receiving chamber can be drained during the removal of the filter housing cover, a closure device arranged coaxially in the cap of the intermediate piece and rotatable about a filter axis, the closure device having a closure element configured to close the drainage duct, wherein the closure device includes an annular plate and a lateral wall extending axially therefrom surrounding a central opening, wherein the lateral wall is perforated in a circumferential direction via a plurality of openings, wherein the plate is arranged in alignment to the drainage duct and by rotating the housing in a first direction relative to the filter housing cover the plate axially adjusts into a first position closing off the drainage duct via the closure element, and by rotating the housing in a second direction relative to the filter housing cover the plate is rotated and moved axially away from the housing into a second position such that the closure element opens the drainage duct. |
