CLEANABLE MICRO FILTER

Abstract: A cartridge or cassette micro filter (1) has separators (3) forming separate filter chambers or folds (2). A thin micro filter material (4) is stretched between the separators (3). A traversing vacuum nozzle or suction head (6) cleans dust or any deposit collected on the face material (4) of the filter and is successively applied to all chambers (12). The full effect of the vacuum is applied to a small portion of the filter in a sequential fashion. The vacuum sweeping may be automatic.

Description: Cleanahle Micro Filter A cartridge or cassette filter with separators so arranged to form separate chambers to which vacuum may he applied to clean the dust collected or any deposit on the face material of the filter. In spite of the depth of the filter which has folds, the vacuum, once applied to each separate fold by traversing a suction head under the assembled folds, without entering between folds, remove material throughout the affected fold, the process is continued on the next fold, and so on. Filters with folded or loop filtering media may be so cleaned from outside the filter leaving the cassette intact and also in place. Automatic vacuum sweeping of filters arranged in rows or series is also claimed. T e separators in the arrangement of the filter descend to a particular level at which the vacuum sweep traverses so that each separator becomes apartition to create small chambers so that the full effect of the vacuum is applied to a small portion of the filter in sequential fashion. The separators may be further guarded or protected by a wire or other screen which will not interfere with the vacuuming process. The vacuum nozzle will progress so that its longitudinal dimension is parallel to the folds as opposed to crosswise traverse which is ineffective. This claim is for the discovery of the preferential OMPI * <_\ . W1iP p Oo rS, c.rryngenent required to obtain cleaning by vacuuming. Further the vacuum nozzle may have an opening the width of, wider or narrower than the space between the sepa¬ rators, it being a function of the quantity of vacuum air drawn that determines the width of the vacuum sweep slot. Ka ing a very narrow slot is claimed as new to allow traverse time in automatic operations when vacuum is applied to a single fold-chamber. The invention is illustrated by the drawing, having the following denominations: 1 cartridge micro filter 2 fold chamber 3 separator micro filter 5 wire or screen 6 suction nozzle • 7 vacuum suction 8- travel of vacuum nozzle 9 10 gas to be filtered 11 filtered gas 12 vacuum sucked filter cleaning air stream

Claims: Claims : 1. Cleanable air filter in the form of a cartridge or cassette with a folded porous sheet containing separator sticking into the folds and ending outside them at the same level, a suction nozzle being able to traverse the assembled folds just outside the separators and with the size corresponding to a fold. 2. Air filter as claimed in claim 1 characterized by a wire or other screen joining the outside ends of the separators and preventing the nozzle from entering into the folds. 3- Method of cleaning an air filter in the form of a cartridge or cassette with a folded microporous sheet containing separators sticking into the folds and ending outside them at the same level, characterised by a suction nozzle traversing just outside the separators and moving from one fold to another.

Inventors: KERMAN K
Applicants: CLEANAIR FOERSAELJNINGS AB
Application year: 1978
Main classification: B01D46
IPC codes: B01D46