DE102008057736A1 - Filter element has filter medium folded in zigzag form, and filter medium is provided with sealed lateral strip along folding pocket, where central tube is made of thermoplastic material - Google Patents

Abstract

The filter element has a filter medium folded in zigzag form, and the filter medium is provided with a sealed lateral strip along a folding pocket. The filter element is formed to a round filter element such that the both folds are connected together. A central tube is made of thermoplastic material, and is arranged in inner area.

Description

Technical area

The The invention relates to a filter element consisting of a zig-zag folded Filter media.

State of the art

Out The prior art circular filter element from a zig-zag folded Filter paper or filter fabric known. These round filter elements are provided on their faces with end plates. A round filter element will be first made of a filter material web and that by zigzag-shaped folding of the web. This is brought into a concentric shape and end plates glued or welded the end faces of this filter medium. at Care must be taken to ensure that the pleat spacing is uniform and each fold from the adjacent fold a certain distance thus has a uniform filter loading can be done.

Disclosure of the invention

Of the Invention has for its object to provide a filter element, that made with high precision can be and with a little effort a uniform pleat spacing is achievable. This object is achieved by the features of the independent claim 1 solved. The invention will be explained in more detail with reference to embodiments.

Brief description of the drawings

The 1 : shows a filter element with side strips.

2 : this in 1 illustrated filter element in concentric form with a central tube.

embodiments the invention

This in 1 filter element shown consists of a filter medium which is folded zig-zag and is provided at the two, transverse to the bars extending end faces with a nonwoven material. This nonwoven material is, for example, adhered to the filter medium. By this arrangement, filter bags are formed. The filter material web is formed in a next process step to a concentric filter element ( 2 ) thereby the overlapping side strips may overlap on the upper end face and on the lower end face, not shown here. But it is also possible to glue the individual end folds together or connect in another way, so that a reliably sealed round filter element is formed.

2 shows the round filter element in a sectional view. The side strips or side walls at the end faces overlap to a certain extent the central tube and can be coupled directly to the central tube, for example via a welded connection. The center tube consists of transverse and longitudinal webs on which the zig-zag folded element with the inwardly directed side tips.

Of the essential advantage of this structure is that the relative soft and flexible sidebands when installing the filter element in a housing against the housing contour can be sealed. There will be no additional Sealing lips or sealing rings required.

One Another advantage is that a uniform pitch division is realized. With unstable media like in particular fleece was this was not possible until now. Furthermore Such a structure can also be coated with activated carbon particles or the filter medium itself may have pockets for receiving of activated carbon. Especially when using such filter elements as cabin air filter for Motor vehicles, the embedding of activated carbon is advantageous since with it also smells be absorbed by the filter element.

Claims (2)

Filter element consisting of a zig-zag folded Filter medium, which along the folding pockets are provided with sealing side strips, wherein the filter element is formed into a round filter element, such that the first and last folds are connected together and in the interior a central tube made of a thermoplastic material is arranged. Filter element according to claim 1, characterized in that in that the side strips extend radially inwards over the central tube and are connected to the central tube.