Filter for the filtration of a fluid flow

Details Filter for the filtration of a fluid flow Filter for the filtration of a fluid flow

1996-02-14

1997-10-21

Spitzer, Robert

Gas separation

With means securing or retaining separating media

Unit or cohesive sheet-like media in flow line or frame

55502, 55511, 55521, 55DIG39, 2104933, 2104935, B01D 4610, B01D 4652

Patent

active

056791224

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND FILTER OF THE INVENTION

The invention is directed to a filter for the filtration of a fluid flow, particularly a filter for the filtration of a fluid flow to be introduced into the passenger cabin of a motor vehicle.
Filters for the filtration of a fluid flow, particularly for the filtration of an air flow, are known in a wide variety of embodiments. Since the filtering efficiency of filter or filter elements largely depends on the size of the filter surface exposed to the flow, frequently used are zig-zag-shaped pleated filter elements. In this case, the filter element itself comprises a filter paper or a filtering non-woven supported on a likewise zig-zag-shaped pleated support structure arranged therebelow.
Filters with pleated filter elements are known from GB-PS 1 570 385 and EP-A-0 438 639. In these known filters, the zig-zag-shaped pleated filter element is surrounded by a rigid rectangular frame, with the linear frame portions extending in a common plane. From DE-A-38 34 942, a filter device is known wherein the filter element consists of a plurality of filter blocks interconnected by flexible bands. Each of the filter blocks comprises a pleated, multi-part filter element surrounded by a rigid frame. The frames of these filter elements are connected to each other by the flexible bands.
Besides the above described substantially flat filter elements, there are also known round filters wherein the zig-zag-shaped pleated filter element is arranged in an annular configuration. Such round or ring-shaped filters are described in U.S. Pat. No. 3,058,594, U.S. Pat. No. 3,520,417, U.S. Pat. No. 4,615,804 and EP-A-0 441 045. Ends of these round or ring-shaped filter elements which are facing each other in their axial direction are provided with disk-shaped covers connected to the filter element.
Particularly in the field of motor vehicles, narrow space limitations can make it necessary that a zig-zag-shaped filter element is received by the filter frame in a bent condition. On the other hand, a bent or otherwise deformed orientation of a zig-zag-shaped filter element can also be suggested for flow reasons and thus be advantageous. The production of a bent filter element is relatively complicated. Further, the mounting of curved filter elements can cause problems due to restricted space conditions.
From EP-A-0 380 026, there is known a flexible flat filter element which is adapted for insertion into curved guide grooves of a filter frame. However, in the filter surface offered by a flat filter element is not sufficient in filter capacity so that this known filter element is useful only in a limited range of applications. In all cases where high filter capacities are required in relatively small flow cross sections, zig-zag-shaped pleated filter elements should be used.
DE-A-41 43 237 (corresponding to PCT/US 92/09 309) discloses a flexible zig-zag-shaped filter element. This known filter element, on its edges extending transverse to the curved bending regions and the flat folding regions, is provided with flexible bands which, on the longitudinal edges or longitudinal sides of the filter element which are oriented in the folding direction, are tightly connected to the filter element. The filter element according to DE-A-41 43 237 can be stored in compacted form because the flexible bands make it possible to compress the zig-zag-shaped filter element and to store it in this condition. However, this filter element is to be inserted into rigid filter frames as described in PCT-US 92/09 311.
Finally, EP-A-0 170 643 discloses a filter wherein the zig-zag-shaped pleated filter element is held in position by having its edges clamped tight between an upper and a lower frame element. On the longitudinal frame portions extending in the direction of the longitudinal edges of the filter element, the two frame elements are provided with mutually complementary, substantially triangular projections which are in engagement with each other and hold the filter element between them. However, also this two-part fi

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