Filter device
The invention relates to a filter device at least consisting of two coaxially arranged filter elements ( 12, 14 ) which delimit a cavity ( 16 ) between them, characterised in that the inner side ( 18 ) of the outer filter element ( 14 ), which faces the cavity ( 16 ), has at least in some parts a separating arrangement ( 20 ) for gas bubbles such as air bubbles, and the cavity ( 16 ) opens at the head end into at least one discharge opening ( 22 ) for gas bubbles coming in.
1 . A filter device comprising at least of two filter elements arranged coaxially with each other which define a cavity between them; wherein
the inside of an outer filter element of the two filter elements, which is directed towards the cavity, has at least in some part a separating device for gas bubbles;
the cavity opens at a head end into at least one discharge opening for such gas bubbles;
the two filter elements are accommodated at the foot and head end in at least a foot-end end cap and a head-end end cap, respectively,
the at least one discharge opening is formed of a passage in the head-end end cap, which connects the cavity between the filter elements to the environment;
the head-end end cap with its discharge opening is overlapped with a predefinable gap by a cover cap; and wherein
an annular gap is formed in the region of the overlap from the cover cap to the head-end end cap, via which annular gap the respective fluid originating from a discharge opening is guided to an outer circumference side of the outer filter element, which outer filter element is formed hollow and cylindrical.
2 . The filter device of claim 1 , wherein the outer circumference side of the outer filter element is formed of a perforated supporting tube.
3 . The filter device of claim 1 , wherein one of the two filter elements is an inner hollow cylindrical filter element and a flow guidance element is arranged on the inside of the inner hollow cylindrical filter element in the region of the head-end end cap.
4 . The filter device of claim 3 , wherein the head-end end cap is connected to the cover cap in the region of the flow guidance element.
5 . The filter device of claim 1 , wherein the two filter elements, the end caps, and the cover cap form a replaceable assembly for use in a fluid tank.
6 . The filter device of claim 1 , wherein an inner filter element of the two filter elements has a perforated supporting tube in the direction of the cavity.
7 . The filter device of claim 1 , wherein the separation device on the inside of the outer filter element is formed of a lattice, mesh or fabric structure.
8 . The filter device of claim 1 , wherein the separating device is configured for air bubbles.
9 . The filter device of claim 2 , wherein one of the two filter elements is an inner hollow cylindrical filter element and a flow guidance element is arranged on the inside of the inner hollow cylindrical filter element in the region of the head-end end cap.
10 . The filter device of claim 2 , wherein the head-end end cap is connected to the cover cap in the region of the flow guidance element.
11 . The filter device of claim 3 , wherein the head-end end cap is connected to the cover cap in the region of the flow guidance element.