Separation device and oil separating air filter assembly comprising such separation device as well as method for separating fluid from a gas stream deriving from a connecting device

A separation device for separating a fluid from a gas stream deriving from a connecting device, the separation device comprising:

• a housing configured to be replaceably connected to a connector head of the connecting device,
• wherein the housing comprises
• a cup-shaped housing corpus and
• a housing cover covering an axial end of the housing corpus,
• wherein the housing cover is non-detachably connected to the housing corpus,
• wherein an axis extends longitudinally through the housing corpus and defines an axial direction;
• a hollow cylindrical filter insert received in the housing in a flow path of the gas stream extending from at least one raw gas inlet of the housing to at least one clean gas outlet of the housing,
• wherein the hollow cylindrical filter insert comprises
• at least one main separator element,
• wherein the at least one main separator element comprises
• a ring-shaped support body and
• further comprises at least one hollow cylindrical coalescing filter medium comprising
• at least one coalescer material configured to remove the fluid from the gas stream;
• at least one preliminary separator element arranged concentrically to the at least one main separator element in the housing in the flow path of the gas stream between the raw gas inlet of the housing and the at least one main separator element,
• wherein the at least one preliminary separator element comprises
• a hollow cylindrical coalescing filter medium comprising
• at least one coalescer material configured to remove the fluid from the gas stream;
• wherein the hollow cylindrical filter insert further comprises
• at least one first end disc disposed at a first axial end face side of the hollow cylindrical filter insert and
• further comprises at least one second end disc disposed at a second axial end face side of the hollow cylindrical filter insert,
• wherein the at least one first end disc faces the housing cover and the at least one second end disc faces away from the housing cover,
• wherein the at least one first end disc comprises
• a radially outer peripheral wall element surrounding the at least one main separator element and extending over an area of the at least one main separator element in the axial direction, and
• wherein the at least one preliminary separator element is disposed with regard to the axis radially outward from the radially outer peripheral wall element of the at least one first end disc.