Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1985-01-03
1986-09-09
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
55316, 55487, 55498, 55521, 55300, B01D 2706
Patent
active
046107029
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter apparatus or device for air or gas purifying purposes of the type comprising at least one filter layer which is hit and permeated by a gas flow passing through the filter device, so as to separate contaminated constituents from the gas flow.
BACKGROUND OF THE INVENTION
Swedish patent application 8207099-6 discloses a filter device in the form of an integrated bag unit consisting of a coarse filter bag and a fine or microfilter bag enclosing the coarse filter bag. An essential advantage of this filter device is that the coarse filter and the fine filter can be dismounted and disposed of as a single unit. It has however proved difficult to give the coarse filter bag or layer such a fibre structure that it will intercept and separate only the relatively coarse constituents of the air stream while letting through the finer constituents to the fine filter layer. Thus, both the coarse and the fine constituents jointly tend to be agglomerated in and on the coarse filter layer so as to cause premature clogging thereof. As a result, the whole filter device will have a short service life.
BRIEF DESCRIPTION OF THE INVENTIVE CONCEPT
The present invention aims at solving the above-mentioned problem and providing a filter device having a long life. According to the invention, this is achieved in that at least in the immediate vicinity of the front surface of the filter layer that is initially hit by the advancing gas, there are mounted a plurality of flexible strips of a fibrous or non-woven material which are movable relative to said surface and adapted to be automatically set in motion by the advancing gas flow in order to whip or otherwise mechanically work said filter layer to counteract premature clogging thereof, and adapted themselves to intercept and separate contaminated constituents from the gas flow so as to prefilter the gas flow before it reaches the filter layer.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the drawings,
FIG. 1 is a longitudinal section of a filter apparatus or device according to the invention,
FIG. 2 is a cross-section taken along the line II--II in FIG. 1,
FIG. 2A is a cross-sectional view similar to FIG. 2, but showing a modification of the invention,
FIG. 3 is a perspective view illustrating a method for making the strips used in the filter device,
FIG. 4 is a longitudinal section of an alternative embodiment of the filter device according to the invention, and
FIG. 5 is a cross-section taken along the line V--V in FIG. 4.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
The filter apparatus or device shown in FIGS. 1 and 2 generally is in the form of a cylindrical tube or tubular assembly consisting of an outer tubular fine filter layer 1 and a coarse filter layer 2, being also substantially tubular, which is located within the fine filter layer 1 and which, in the shown embodiment, has been folded in order to increase the surface of the layer exposed to filtering. At one end, the thus formed tubular assembly is closed by means of a flat, suitably circular plate 3 consisting of a rigid and suitably inexpensive material, such as board or corrugated board. At the opposite end, the tubular assembly is provided with a flat annular plate 4 having a central opening 5 which forms the inlet of the filter device. In actual practice, the plate 4 may advantageously consist of the same material as the plate 3. The plates 3, 4 are connected to the layers 1 and 2 in any suitable manner, although the layers are preferably secured to the plates by gluing, optionally supplemented with edge rings 6 which embrace and hold together the edges of the plates and outwardly folded edge portions of the outer layer 1.
As appears from the drawings, a cavity 7 is defined by the coarse filter layer 2 and the bottom plate 3. According to the inventive concept, this cavity accommodates a plurality of elongate flexible strips 8 which are adapted automatically to be set in motion by the air which enters the cavi
REFERENCES:
patent: 2911064 (1959-11-01), Evans et al.
patent: 2973830 (1961-03-01), Gruner
patent: 4115082 (1978-09-01), Newell
patent: 4332230 (1982-03-01), Schoen et al.
patent: 4336043 (1982-06-01), Aonoma et al.
Industriell Arbetshygien i Soderhamn AB
Nozick Bernard
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