Air filter for a painting booth used for spray coating
Air filter for spray coating, having: a housing designed for showing a cuboid shape, with a face forming an air inlet and an opposed face forming an air outlet; one or more accordion panels with fold lines, to be accordion folded about said fold and to be located in the housing for forming a filtering barrier; the one or more accordion panels of the filtering barrier having at least one pair of flap portions configured to be folded to form a converging profile followed aeraulically by a trapping chamber formed by one of the accordion panels, and openings forming escape lateral passages of the trapping chamber(s).
1. An air filter for spray coating, said air filter comprising:
a housing designed for showing a cuboid shape, with a face forming an air inlet and an opposed face forming an air outlet; and
one or more accordion panels with fold lines, to be accordion folded about the fold lines and to be located in the housing for forming a filtering barrier;
wherein the one or more accordion panels of the filtering barrier comprises at least one pair of flap portions formed by end portions of one of the one or more accordion panels, configured to be folded to form a converging profile followed aeraulically by a trapping chamber formed by two folded main portions of the accordion panel, and openings forming escape lateral passages of the trapping chamber(s).
2. The air filter according to claim 1 , wherein the openings are adjacent to the corresponding flap portions so as to be distant from a bottom of the corresponding trapping chamber.
3. The air filter according to claim 1 , wherein for each of the at least one trapping chamber, the two folded main portions of one of the one or more accordion panels form an angle being at least one of:
greater than 30°; and
less than 60°.
4. The air filter according to claim 1 , wherein each of the at least one trapping chamber comprises two of the openings formed in the two folded main portions, respectively, of one of the one or more accordion panels.
5. The air filter according to claim 1 , wherein each of the openings is sub-divided along a direction of the fold lines into two sub-openings separated by a portion of the one or more accordion panels.
6. The air filter according to claim 1 , further comprising two holding panels to extend perpendicularly to the fold lines and to engage with opposed ends, respectively, of the one or more accordion panels so as to hold the one or more accordion panels in a stable folded configuration.
7. The air filter according to claim 6 , wherein the two holding panels comprise slots or notches for receiving tabs or protruding portions at the opposed ends, respectively, of the one or more accordion panels.
8. The air filter according to claim 1 , wherein the one or more accordion panels and, if present, the two holding panels, form a continuous guiding surface of the air.
9. The air filter according to claim 1 , wherein the filtering barrier is an inlet filtering barrier to be arranged directly downstream of the air inlet, the air filter comprising an outlet filtering barrier to be arranged directly upstream of the air outlet, the outlet filtering barrier comprising a frame and a layer of fibrous filtering material carried by the frame.
10. The air filter according to claim 1 , further comprising an intermediate filtering barrier comprising a filtering panel with fold lines and configured to be accordion folded along the fold lines.
11. The air filter according to claim 10 , wherein the filtering panel of the intermediate filtering barrier comprises a perforated panel and a layer of fibrous filtering material carried by the perforated panel.
12. The air filter according to claim 10 , wherein the intermediate filtering barrier comprises a cross member configured for engaging with the fold lines of the filtering panel located on a rear face of the intermediate filtering barrier when the filtering panel is accordion folded, in order to maintain constant a distance between the fold lines on the rear face.
13. The air filter according to claim 10 , wherein the intermediate filtering barrier is configured to be located in the housing between the filtering barrier being an inlet filtering barrier to be arranged directly downstream of the air inlet, and an outlet filtering barrier to be arranged directly upstream of the air outlet.
14. The air filter according to claim 1 , wherein the housing and the one or more accordion panels are made of cardboard.