Liquid purification element for purifying a liquid

1. A multi-layer liquid purification element, comprising:

a flexible liquid-permeable top layer being bendable around a portion of a housing for mounting the multi-layer liquid purification element;

a flexible liquid-impermeable base layer being bendable around the portion of the housing, said base layer having a suction port for drawing liquid through the multi-layer liquid purification element, and said base layer having a structured surface directed at least partially toward said top layer; and

a connection interconnecting at least said top layer and said base layer.

2. The multi-layer liquid purification element according to claim 1 , which further comprises at least one separate insert disposed between said top layer and said base layer, said at least one separate insert including at least one filter layer.

3. The multi-layer liquid purification element according to claim 1 , which further comprises an areal duct system formed by said structured surface and disposed between said base layer and said top layer.

4. The multi-layer liquid purification element according to claim 1 , which further comprises:

at least one separate insert disposed between said top layer and said base layer;

said structured surface of said base layer having a multiplicity of structures generating a spacing between said at least one separate insert and said base layer; and

said structures being at least one of studs, elevations or ducts.

5. The multi-layer liquid purification element according to claim 1 , wherein said base layer has an encircling stepped edge at which said connection is formed.

6. The multi-layer liquid purification element according to claim 1 , wherein said suction port is formed by an opening in said base layer with a cylindrical projection.

7. The multi-layer liquid purification element according to claim 1 , wherein said connection is formed with a weld seam interconnecting at least said top layer and said base layer.

8. A device for extracting a liquid additive for exhaust-gas purification from a tank, the device comprising:

a housing for installation in the tank;

said housing having an extraction port connected to said suction port of said multi-layer liquid purification element according to claim 1 ; and

said suction port being configured to extract the liquid additive from the tank through said multi-layer liquid purification element.

9. A motor vehicle, comprising:

an internal combustion engine;

an exhaust-gas treatment device for purification of exhaust gases of said internal combustion engine;

a tank for storing a liquid additive; and

a device for extracting the liquid additive from said tank and for supplying the liquid additive to said exhaust-gas treatment device;

said device including a housing for installation in the tank, said housing having an extraction port connected to said suction port of a multi-layer liquid purification element according to claim 1 , and said suction port being configured to extract the liquid additive from the tank through said multi-layer liquid purification element.

10. A method for producing a liquid purification element, the method comprising the following steps:

a) providing a flexible liquid-permeable top layer being bendable around a portion of a housing for mounting the multi-layer liquid purification element;

b) providing a flexible liquid-impermeable base layer being bendable around the portion of the housing and having a structured surface directed at least partially toward the top layer;

c) forming a connection of at least the top layer and the base layer; and

d) forming a suction port on the base layer for drawing liquid through the liquid purification element.