Filling connector with integrated ventilation duct

1. A filling connector for filling a liquid container, the filling connector comprising:

a liquid pipeline, for conveying liquid in a flow direction from a liquid inlet end portion having a liquid inlet opening to a liquid outlet end portion having a liquid outlet opening; and

a gas pipeline, for conveying gas in an opposite flow direction while liquid is conveyed through the liquid pipeline, the opposite flow direction being from a gas inlet end portion having a gas inlet opening to a gas outlet end portion having a gas outlet opening, the liquid pipeline and the gas pipeline being formed integrally with one another;

wherein the filling connector is formed as an injection-moulded part, with the gas pipeline being manufactured using injection technology;

wherein the position of the gas outlet opening relative to the liquid inlet opening is visible from the outside during any pouring of a liquid in such a way that the liquid can be poured selectively past the gas outlet opening into the liquid pipeline;

wherein at least one axial portion of the gas pipeline is enclosed by the liquid pipeline; and

wherein the external cross-sectional area of the at least one axial portion of the gas pipeline enclosed by the liquid pipeline corresponds to at most 20% of the internal cross-sectional area of the liquid pipeline which can be flowed through.

2. The filling connector according to claim 1 , characterised in that at least an axial portion of the gas outlet end portion is enclosed by the liquid inlet end portion, the liquid inlet opening and the gas outlet opening being mutually offset in the axial direction by at most 20% of the maximum internal diameter of the liquid inlet opening.

3. The filling connector according to claim 2 , wherein the liquid inlet opening and the gas outlet opening are mutually offset in the axial direction by at most 10% of the maximum internal diameter of the liquid inlet opening, and are flush with each other.

4. The filling connector according to claim 1 , characterised in that at least an axial portion of the gas inlet end portion is enclosed by the liquid outlet end portion, the liquid outlet opening and the gas inlet opening being mutually offset in the axial direction by at most 50% of the maximum internal diameter of the liquid outlet opening.

5. The filling connector according to claim 4 , wherein the liquid outlet opening and the gas inlet opening are mutually offset in the axial direction by at most 20% of the maximum internal diameter of the liquid outlet opening, and are flush with each other.

6. The filling connector according to claim 1 , characterised in that when the filling connector is installed the gas inlet opening is arranged in a geodetically upper region of the liquid outlet end portion.

7. The filling connector according to claim 1 , characterised in that the liquid pipeline is elbowed at least once along the flow path thereof.

8. The filling connector according to claim 7 , wherein the liquid pipeline and the gas pipeline are elbowed repeatedly along the flow path thereof.

9. The filling connector according to claim 1 , characterised in that the gas pipeline is connected to the liquid pipeline in a material fit at least in an axial portion.

10. The filling connector according to claim 9 , wherein the material fit over the entire axial length.

11. The filling connector according to claim 1 , characterised in that the liquid outlet end portion and the gas inlet end portion comprise a sealing element.

12. The filling connector according to claim 11 , wherein the liquid outlet end portion and the gas inlet end portion share the sealing element.

13. The filling connector according to claim 1 , characterised in that at least one fastening means, formed in a single piece with the filling connector, is provided for fastening the filling connector.

14. The filling connector according to claim 1 , characterised in that the filling connector comprises at least one mounting element.

15. The filling connector according to claim 14 , wherein the at least one mounting element is adapted to mount an electric line and/or a tube.

16. The filling connector according to claim 1 , wherein the gas pipeline is enclosed by the liquid pipeline.

17. The filling connector according to claim 16 , wherein the enclosed gas pipeline is off-center relative to the liquid pipeline.

18. The filling connector according to claim 1 , wherein the injection technology used to manufacture the gas pipeline is water injection technology.

19. The filling connector according to claim 1 , wherein the injection technology is gas injection technology or projectile injection technology.

20. The filling connector according to claim 1 , wherein the external cross-sectional area of the at least one axial portion of the gas pipeline enclosed by the liquid pipeline corresponds to at most 20% of the internal cross-sectional area of the liquid pipeline which can be flowed through.

21. The filling connector according to claim 20 , wherein the external cross-sectional area of the at least one axial portion of the gas pipeline enclosed by the liquid pipeline corresponds to at most 10% of the internal cross-sectional area of the liquid pipeline which can be flowed through.