Filter cartridge for a filter apparatus

1. A filter cartridge for a filter apparatus, comprising:

a filter element that encloses an clean space within the filter element, at least partially;

wherein the filter element has an outflow opening in flow communication with the clean space in the filter element;

wherein the filter element has a longitudinal axis extending through the filter element and through the outflow opening;

wherein a hollow base for connecting to a housing-side fastening element is arranged on or in the clean space;

wherein an interior of the hollow base is sealed off from the clean space in a flow-tight manner;

wherein the hollow base extends orthogonally to major planes of extension of an upper and a lower filter layer if the filter element; and

wherein the clean space is arranged between the upper and lower filter layers, laterally separating major portions of the upper and lower filter layers from one another.

2. The filter cartridge as set forth in claim 1 , wherein

the outflow opening is arranged on the filter element on an outflow pipe.

3. The filter cartridge as set forth in claim 2 , wherein

the filter element engages around the outflow pipe at least partially;

wherein the outflow pipe has at least one flow opening arranged in a circumferential wall of the outflow pipe in a portion around which the filter element engages.

4. The filter cartridge as set forth in claim 2 , wherein

the hollow base is introduced into the outflow pipe.

5. The filter cartridge as set forth in claim 1 , wherein

the filter element is embodied as a folded filter.

6. The filter cartridge as set forth in claim 1 , wherein

the hollow base has an elongate cross section in a plane parallel with the longitudinal axis extending through the filter element.

7. The filter cartridge as set forth in claim 1 , wherein

an interior of the hollow base is continuous.

8. The filter cartridge as set forth in claim 1 , wherein

the filter element has an at least approximately U-shaped cross section;

wherein legs of the U-shaped cross section enclose a filtered side of the filter element;

wherein the outflow opening lies transverse to a longitudinal extension of the legs.

9. A filter apparatus, comprising:

a filter cartridge according to claim 1 .

10. The filter apparatus as set forth in claim 9 , wherein

at least one fastening element is arranged on the filter housing or on the housing cover and projects into an interior of the hollow base.

11. The filter apparatus as set forth in claim 10 , wherein

the at least one fastening element on the filter housing or on the housing cover has a smaller cross section than the hollow base.

12. The filter apparatus as set forth in claim 10 , wherein

two fastening elements of the at least one fastening element on the filter housing or on the housing cover project into the interior of the hollow base and are interconnected.

13. A filter cartridge for a filter apparatus, comprising:

a filter element that encloses an clean space within the filter element, at least partially;

wherein the filter element has an outflow opening in flow communication with the clean space in the filter element;

wherein the filter element has a longitudinal axis extending through the filter element and through the outflow opening;

wherein a hollow base for connecting to a housing-side fastening element is arranged on or in the clean space;

wherein an interior of the hollow base is sealed off from the clean space in a flow-tight manner;

wherein the outflow opening is arranged on the filter element on an outflow pipe;

wherein the filter element engages around the outflow pipe at least partially; and

wherein the outflow pipe has at least one flow opening arranged in a circumferential wall of the outflow pipe in a portion around which the filter element engages.

14. The filter cartridge as set forth in claim 13 , wherein

the hollow base extends orthogonally to an upper and a lower filter layers of the filter element;

wherein the clean space is arranged between the upper and a lower filter layers.

15. A filter cartridge for a filter apparatus, comprising:

a filter element that encloses an clean space within the filter element, at least partially;

wherein the filter element has an outflow opening in flow communication with the clean space in the filter element;

wherein the filter element has a longitudinal axis extending through the filter element and through the outflow opening;

wherein a hollow base for connecting to a housing-side fastening element is arranged on or in the clean space;

wherein an interior of the hollow base is sealed off from the clean space in a flow-tight manner;

wherein a fastening element is arranged on a filter housing and on a housing cover; and

wherein the fastening elements of the filter housing and the housing cover project into the interior of the hollow base and are interconnected by a single threaded fastener that joins the housing cover to the filter housing and also sets the position of the filter element to the filter housing.

16. The filter apparatus as set forth in claim 15 wherein the hollow base has an elongated cross section in a plane parallel with the longitudinal axis extending through the filter element and the filter element can be adjusted along the longitudinal axis with respect to the housing.

17. A filter cartridge as set forth in claim 15 , wherein

the hollow base extends transverse to the longitudinal axis of the outflow opening through which the fluid can be discharged from the clean space.

18. The filter cartridge as set forth in claim 17 , wherein

the longitudinal axis through the outflow opening lies transverse to a direction of flow of the filter element.

19. A filter cartridge for a filter apparatus, comprising:

a filter element that encloses an clean space within the filter element, at least partially;

wherein the filter element has an outflow opening in flow communication with the clean space in the filter element;

wherein the filter element has a longitudinal axis extending through the filter element and through the outflow opening;

wherein a hollow base for connecting to a housing-side fastening element is arranged on or in the clean space;

wherein an interior of the hollow base is sealed off from the clean space in a flow-tight manner;

wherein the hollow base extends orthogonally to an upper and a lower filter layers of the filter element and wherein the hollow base has an elongate cross section in a plane parallel with the longitudinal axis extending through the filter element; and

wherein the clean space is arranged between the upper and lower filter layers, laterally separating major portions of the upper and lower filter layers from one another.