SE436099B - Filter device for cleaning air or gas - Google Patents

Abstract

A filter device for air or gas purification purposes incorporates partly, at the very least, a porous and preferably pleated filter pipe (1); and partly a large amount of flexible, oblong elements (6) arranged within this which are designed to automatically become agitated with the help of flow-gas travelling in the pipe, and thereby effecting a mechanical processing of the filter pipe under the resistance of prior filling of this. External to, and at a distance to, the first named filter pipe (1), a second filter pipe (7) is arranged which, like the first filter pipe, delimits a ring shaped column (9) which is filled with an absorption material (10), active carbon for example.<IMAGE>

Description

10 15 20 30 35 ë-š fi š9å9 fl k filtration exposed surface. At one end is the filter tube 1 closed by means of a flat, preferably circular disc 2, eg of cardboard. At the opposite end, the tube is provided with one flat, annular disc 3 having a central opening 4 which forms an inlet mouth for the filter device. In the central hole room 5 delimited by the filter tube 3 is arranged a plurality elongate, flexible strips 6 arranged to self-acting set in motion by the air or gas flowing into the cavity and further out through the filter tube 1. These strips suitably finished from a fibrous or non-moven material, for example on the basis of cellulose fibers. In practice, it is preferred strips which are thin and have a comparatively sparse fiber network work. These strips 6 which together form an irregular cooling inside the cavity 5, serves in practice as a pre-filter which can absorb a large amount of solids from the air passing the filter device. ' On the outside of the first filter tube 1, two are arranged further filter tube, namely partly a second filter tube 7 which is located at a considerable distance from the first filter tube 1, on the other hand, a third filter tube 8 which is arranged in immediate connection to the first pipe 1. Between the filter pipe on one side 7 and on the other hand the filter tubes 1 and 8 are thus formed a ring V-shaped column 9 with a width which in practice can amount to 5 á 25, preferably about 10% of the total diameter of the filter device. In this column is arranged in accordance with the principle of the invention an adsorption which essentially fills the gap in question. This noble sorbents may in practice consist of barley and / or particulate matter Eormy material, such as activated carbon or in the form of that material which is commercially available under the trade name PURAFIL. Although the adsorbent 10 in the column 9 is brought to completion constantly fill the gap in connection with the manufacture of the filter means there is always a tendency of the adsorbent to be compressed due to vibrations and vibrations, e.g. in connection with transport from the factory to the place of use. For to avoid that such compression of the agent would lead to 10 15 20 25 30 35 830395944 unfilled cavities, at least one ring 11 is arranged in the gap 9 of an elastic, expandable material, such as foam rubber or similar. This ring 11 is compressed in connection with the filter device and as the volume of the adsorption the means 10 decreases due to vibrations, the ring 11 will expand in the corresponding and do not fill it of the adsorbent filled the cavity so that air and gas are always forced to pass through the adsorbent.

The two filter tubes 7 and 8 can in practice with advantage survive of paper or cellulosic fibrous webs wound in two turns, one on top of the other. Preferably, the paper is of the type that includes one or more types of man-made fibers that impart them both filter tubes or layers electrostatic properties.

The filter device described is particularly suitable for use in dust collectors used for the disposal of welding smoke.

Possible modifications of the invention It is a given that the invention is not limited thereto described and shown in the drawings. That's how it is conceivable to dispense with the third filter tube 8 and allow the adsorption the means 10 also fill in the spaces between the folds in the first the filter tube 1. It is also conceivable to train the filter device with only two fully cylindrical, ie non-pleated filter tubes.

Of course, the properties of the three different filter tubes 1,7,8 in different ways, but preferably so that the first filter tube 1 serves as a coarse filter, the next filter tube 8 as an intermediate filter, and the last filter tube 7 as a fine filter.

Optionally, both filter tubes 7 and 8 can act as fine filters.

The presence of the adsorbent 10 liberates the flowing gas from even volatile or gaseous constituents parts of a harmful nature. By combining the progressive action filters described in SE 8302657-5 with the adsorbent layer according to the present invention, a versatile, priced cheap waste filter device that effectively filters solid particles while being able to adsorb gaseous substances.

Claims (2)

10 15 & 3Û3959 "4 ||> PATENTKRAV Filter means for air or gas purification purposes, comprising on the one hand at least one porous, suitably pleated filter tube (1), and on the other hand a plurality of suitably mounted and suitably elongate elements (6) arranged therein gas flowing through the tube and thereby mechanically processing the filter tube while counteracting premature clogging thereof, characterized in that outside and at a distance from the first-mentioned filter tube (1) a second filter tube (7) is arranged which is delimited together with the first filter tube. an annular gap (9) filled with an adsorbent (10), for example activated carbon. IN Filter device according to Claim 1, characterized in that at least one ring (11) of elastically expandable material, for example foam rubber, is arranged in the gap (9), with the task of filling in any. adsorbents unfilled voids in the gap. s '___ | "' -