Filter unit for an extractor hood
A filter unit for an extractor hood includes at least one filter element, and at least one protection plate which is arranged in a flow direction upstream of the filter element. The protection plate is made of at least two layers and can have a thickness in a range of 0.5 mm to 10 mm.
1. A filter unit for an extractor hood, comprising:
at least one filter element having a front surface, a rear surface, and side surfaces, the front surface being a flow entrance of the at least one filter element;
a baffle plate arranged in a flow direction upstream of the filter element and in front of the front surface of the filter element; and
at least one protection plate arranged in the flow direction upstream of the filter element and the baffle plate, the at least one protection plate arranged in front of the baffle plate, the at least one protection plate coupled to the baffle plate and covering a front surface of the baffle plate, said protection plate made of at least two layers.
2. The filter unit of claim 1 , wherein one of the at least two layers constitutes a coating of the other one of the layers.
3. The filter unit of claim 2 , wherein the coating has a thickness in a range of 2 to 20 μm.
4. The filter unit of claim 2 , wherein the coating has a thickness in a range of 4 to 10 μm.
5. The filter unit of claim 1 , wherein one of the at least two layers is made of polycarbonate.
6. The filter unit of claim 1 , wherein at least one of the at least two layers is a polysiloxane layer.
7. The filter unit of claim 1 , wherein one of the at least two layers is a film.
8. The filter unit of claim 1 , wherein the at least one protection plate has a thickness in a range of 0.5 mm to 10 mm.
9. The filter unit of claim 1 , wherein the at least one protection plate has a thickness in a range of 0.5 mm to 1 mm.
10. The filter unit of claim 1 , wherein the at least one protection plate has a thickness in a range of 3 to 6 mm.
11. The filter unit of claim 1 , wherein the at least one protection plate is joined to the baffle plate by an adhesive bond.
12. The filter unit of claim 1 , wherein the at least one protection plate is fixed to the baffle plate by a snap-fit connection.
13. The filter unit of claim 1 , further comprising at least one snap-fit element formed or glued on one side of the at least one protection plate.
14. The filter unit of claim 1 , wherein the at least two layers of the at least one protection plate includes:
a carrier layer; and
a coating layer formed on the carrier layer.
15. The filter unit of claim 14 , wherein the coating layer is formed on an upstream side of the carrier layer.
16. The filter unit of claim 14 , wherein the coating layer is formed on a downstream side of the carrier layer.
17. The filter unit of claim 14 , wherein the coating layer is formed on an upstream side of the carrier layer and a downstream side of the carrier layer.
18. The filter unit of claim 14 , wherein the carrier layer is made of polycarbonate.
19. The filter unit of claim 14 , wherein coating layer is a polysiloxane layer.
20. The filter unit of claim 18 , wherein coating layer is a polysiloxane layer.
21. The filter unit of claim 1 , wherein the at least two layers of the at least one protection plate includes:
a carrier layer; and
a coating layer formed on the carrier layer, and
wherein the carrier layer is coupled to an upstream surface of the baffle plate by an adhesive bond.
22. The filter unit of claim 21 , further comprising a sealing strip at an edge of the adhesive bond between the carrier layer and the upstream surface of the baffle plate.
23. The filter unit of claim 1 , wherein the at least one protection plate covers an entire surface of the baffle plate.