Gas separation – Two or more separators – Plies or layers of different characteristics or orientation
Patent
1994-12-02
1996-04-23
Bushey, C. Scott
Gas separation
Two or more separators
Plies or layers of different characteristics or orientation
55497, 55500, 55502, 55522, B01D 4600
Patent
active
055099505
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a filter device for the filtration of gases and/or fluids, and particularly for the filtration of air streaming into the passenger cabin of a motor vehicle.
BACKGROUND AND FIELD OF THE INVENTION
Filter devices for the above uses are known in a large variety of types. For enlarging the volume of the filter medium having the gas or the fluid passing there-through for cleaning, a known approach has been to arrange the filter medium in zig-zag pleats. Thus, in a large number of known filter devices, the filter element comprising the filter medium has a pleated configuration which is exposed to the flow to be cleaned. In most cases, the filter elements are enclosed by a filter element holding frame for stabilization.
Filter devices of the above type are known, e.g., from U.S. Pat. No. 3,246,457, GB-PS 1 570 385 and EP-A-0 450 299. A common disadvantage of these known filter devices resides in that the exchangeable part of the filter device encloses the filter element and the holding frame of the filter element. However, these two components of known filter devices consist of different materials, thus complicating any environmentally friendly disposal of the disposable parts of known filter devices. Further, the quantity of waste or disposable material is considerable because the stabilization of the pleated structure of the filter medium of the filter element necessitates relatively large quantities of material which; when exchanging the filter medium, have to be exchanged as well and thus have to be disposed of.
It to an object of the invention to provide a filter device for the filtration of gases and/or fluids, and particularly a filter device for the filtration of air streaming into the passenger cabin of a motor vehicle, wherein the quantity of material which is not used for the cleaning of games and/or fluids, but which must be disposed nonetheless when replacing a spent filter medium, is as small as possible.
For solving the above object, the invention proposes a filter device of the above type comprising the following features: being provided, on its two longitudinal sides extending in the pleating direction, with stabilizing strips for stabilizing the zig-zag-shaped pleated configuration of the filter medium, with said stabilizing strips being directly bonded to the longitudinal edges of the filter medium, which are facing away from the filter medium, and and being adapted for insertion of the filter element thereinto and for removal of the filter element therefrom, frame, the sealing material of the stabilizing strips is in abutment with the inner sides of said longitudinal frame portions of the filter element holding frame and end portions of the filter medium in the pleating direction are engaged with receiving means provided on said transverse portions of the filter element holding frame.
In the filter means of the invention, the stabilization of the pleated configuration of the filter medium is effected--irrespective of a certain inherent stability of shape of the filter medium in its pleated state only by two stabilizing strips. These stabilizing strips are bonded to the longitudinal edges of the filter medium which ends extend in the pleating direction. The thickness of said stabilizing strips, while being dependent an the material selected for the stabilizing strips, need only be selected in such a manner that the filter medium is given a consistent or regular mechanically stable pleated configuration. Such stabilizing strips or similar suitable measures are not provided on the and portions of the filter medium in the pleating direction. The width of the stabilizing strips along the longitudinal edges of the filter medium corresponds to the height of the pleated structure.
Handling of the filter element of the filter device of the invention in easy and convenient. In order to replace a filter element with its spent filter medium by a now one, the old filter element is taken out of the filter element holding frame and a new filter element in inserted into the hold
REFERENCES:
patent: 2415579 (1947-02-01), Dahlman
patent: 3246457 (1966-04-01), Baun
patent: 3712033 (1973-01-01), Gronholz
patent: 3793813 (1974-02-01), McAllister
patent: 4439219 (1984-03-01), Lambrecht
patent: 5047075 (1991-09-01), Lin
patent: 5288300 (1994-02-01), Muller et al.
Valkenburg Jos
Van de Graaf Peter
Bond William J.
Bushey C. Scott
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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