U.S. patent number RE33,272 [Application Number 07/372,055] was granted by the patent office on 1990-07-24 for filter cartridge for filtering apparatuses.
Invention is credited to Ernst Turck.
United States Patent |
RE33,272 |
Turck |
July 24, 1990 |
Filter cartridge for filtering apparatuses
Abstract
Filter cartridge for filtering apparatuses for removing
impurities from hot and/or highly pressurized flowing gases, with
zig-zag formed, folded, gas-penetrated filter material whose part
surfaces caused by the folding, between the fold lines, are
arranged in relatively close juxtaposition to each other, wherein a
preferably thin-walled plate 15 is arranged in the space between
two respectively adjacent part surface 12, 13 of the filter
material 11, with said plate having one straight-formed edge 16
lying in the inside of the fold 14 and one opposite lying zig-zag
formed edge 17, and the bend or crest lines 18 between the two
edges 16, 17 rise steadily towards the medial plane 19 of the plate
15.
Inventors: |
Turck; Ernst (D-8264
Waldkraiburg, DE) |
Family
ID: |
6195276 |
Appl.
No.: |
07/372,055 |
Filed: |
June 27, 1989 |
PCT
Filed: |
March 28, 1984 |
PCT No.: |
PCT/DE84/00075 |
371
Date: |
November 27, 1984 |
102(e)
Date: |
November 27, 1984 |
PCT
Pub. No.: |
WO84/03842 |
PCT
Pub. Date: |
October 11, 1984 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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Reissue of: |
678282 |
Mar 28, 1984 |
04619676 |
Oct 28, 1986 |
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Foreign Application Priority Data
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Mar 31, 1983 [DE] |
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3311863 |
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Current U.S.
Class: |
55/506; 55/521;
210/493.1 |
Current CPC
Class: |
B01D
46/10 (20130101); B01D 46/523 (20130101) |
Current International
Class: |
B01D
46/52 (20060101); B01D 046/12 () |
Field of
Search: |
;55/497,500,521,528,DIG.31 ;210/493.1,493.3,493.4 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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0067115 |
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Dec 1982 |
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EP |
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0007221 |
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Jan 1982 |
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JP |
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Primary Examiner: Hart; Charles
Attorney, Agent or Firm: Nies, Webner, Kurz &
Bergert
Claims
I claim:
1. A filter cartridge for filtering apparatuses for removing
impurities from hot and/or highly pressurized flowing gases, with
zig-zag formed, gas-penetrated filter material folded at acute
angles, whose part surfaces caused by the folding, between the fold
lines, are arranged in relatively close juxtaposition to each
other, characterized in that: one thin-walled strip 15 is disposed
and arranged in the spaces between each two adjacent part surfaces
12, 13 of the filter material 11, said thin-walled strip 15 having
one straight-formed edge 16 lying in the inside of the fold 14 and
one opposite lying zig-zag formed edge 17, .Iadd.the zig-zag edge
being straight lines to form sharp peaks, .Iaddend.and in that,
relative to the medial plane 19 of said thin-walled strip 15, the
bend or crest lines 18 rise steadily .Iadd.as straight bend lines
.Iaddend.from said one straight formed edge 16 toward the sharp
peaks of said zig-zag formed edge, .Iadd.whereby each said strip 15
engages the adjacent surfaces 12, 13 of the associated filter
material fold solely by a line to surface engagement of each said
straight bend line 18 with the surface of said associated filter
material folds. .Iaddend.
2. A filter cartridge according to claim 1, characterized in that
the part surfaces 20, 21 of the folds of the thin-walled strip 15,
enclose an angle 22 between about 90.degree. to about 120.degree.
in the area of the zig-zag formed edge 17.
3. A filter cartridge according to claim 1 or 2, characterized in
that the thin-walled strips 15 are placed in the folds 14 open to
the discharge side of the filter material 11.
4. A filter cartridge according to claim 1, characterized in that
the thin-walled strips 15 are placed in the folds 14 open to the
approach side of the filter material 11.
5. A filter cartridge according to claim 1, characterized in that
the thin-walled strips 15 are placed in the folds 14 open to both
the approach side and the discharge side of the filter material 11.
Description
The invention relates to a filter cartridge for filtering
apparatuses for the removal of impurities from hot and/or highly
pressurized, flowing gases, with zig-zag formed, folded,
gas-penetrated filter material whose part surfaces, caused by the
folding, between the fold lines, are arranged in relatively close
juxtaposition to each other resulting in acute angles at the fold
lines.
With the filter cartridges in question, phenolic resin-saturated
fiber materials are used, in particular gas-permeable papers,
fibrous webs of various types, which consists of zig-zag formed,
folded strips of this material. The stability of the filter
material depends on the actual material used. Filter materials of
temperature-sensitive material lose stability with increasing
temperature which gives disagreeable results, especially when under
certain operating conditions as a result of the no longer existing
stability of the filter material or the fold, the part surfaces of
the filter material between the individual fold lines touch each
other and possibly adhere to each other. This results in the whole
active filter surface being more or less severely reduced, which
leads to a considerable reduction in the performance of the
filter.
The aforementioned shortcomings occur particularly when in the
scope of a back cleaning of the filter material said material is
subjected to a gas flow impulse in the opposite direction.
In order to counteract the aforementioned disadvantages, filter
materials of paper were given a stamp with knobs or the like,
which, however, are only able to be of effect for the duration of
their stability. With the filters is question it provided that with
higher temperatures of the gas-flow to be cleaned, the filter
material is so strongly heated and softened that the knobs lose
their original form and/or are pressed flat by the adhering part
surfaces of a fold. This results in paper and similar filter
materials being unsuitable for the filter cartridges in question.
The most advantageous are webs of fibrous material which, however,
on the other hand, have the disadvantage of not being stable enough
in shape.
The invention is based on the task of providing a filter cartridge
for filter apparatuses which does not have the aforementioned
disadvantages and with which a collapsing of neighbouring part
surfaces of the filter material of a fold is avoided, with the
efficiency of the filter being impaired to the slightest possible
degree, if at all, and which stands up to the occurring strains in
all operating conditions, i.e. especially with all possible
temperatures and pressures of the gas-flow to be cleaned.
For solving this task it is suggested according to the invention,
to form the filter cartridge for filtering apparatuses in question
in such a way that in the space between two respective adjacent
part surfaces of the filter material, a preferably thin-walled
plate, which can be referred to as a strip, is arranged whose one
edge in the inside of the fold is rectilinear and the other,
opposite-lying edge is of zig-zag formation and that the bend or
crest lines between the two leading edges steadily rise towards the
medial plane of the plate.
Further features of the filter cartridge formed according to the
invention are to be taken from the subclaims and from the following
description of a preferred embodiment of the subject matter of the
invention which is shown in the FIGS. 1 to 3 of the drawing:
FIG. 1 is a perspective view of a plate to be laid in a fold
between two part surfaces of the zig-zag folded filter
material;
FIG. 2 is a section through a fold of the zig-zag folded filter
material in which a plate according to FIG. 1 has been placed;
FIG. 3 is a top view on the open side of the fold of the filter
material according to FIG. 2.
As FIG. 2 shows, the filter material 11 of a filter cartridge of
customary design, placed in filtering apparatuses, is zig-zag
folded, with the material extending from the fold lines at acute
angles. The zig-zag folded filter material can be arranged along a
straight line, a curved line or a circle.
The part surfaces 12, 13 of the filter material 11 form one fold
respectively. The zig-zag folded filter material 11 is commonly
blown against from one side, with the impurities of the gas flow
remaining on the filter material or depositing in the folds 14
between the part surfaces 12 and 13 of the filter material until a
certain density is reached and it becomes necessary to clean the
filter material. For this purpose a gas flow is passed through the
filter in the opposing direction, which removes the agglomerated
impurities from the surface of the filter material, which then fall
into a collecting space and can be drawn off.
In order to now give the filter material, especially the part
surfaces 12 and 13, the required rigidity and support, a plate,
strip of material 15 formed according to the invention according to
FIG. 1 is respectively placed in each fold, having a
straight-formed edge 16 and the opposing edge 17 being zig-zag
formed in such a way that the bend or crest lines 18 between the
two edges 16 and 17 rise steadily towards the medial plane 19 of
the plate 15. Through the specific zig-zag formed folding of the
plate 15, which runs out towards the one straight edge 16 in the
medial plane 19 of the plate 15, part surfaces 20 and 21 are formed
which enclose an angle 22 in the area of the bend and crest lines
18, said angle being between about 90.degree. and about
120.degree..
With such a formation of the plates 15 inserted in the folds 14 of
the zig-zag folded filter material 11, channels are formed which
steadily expands towards the delivery end of each of said folds 14
and which provide a flow-favorable discharge of the gas having
passed through the filter material. Through the zig-zag folding of
the plate 15 with the distinguished fold lines 18 the filter
material lies only in line-form on the plate 15 supporting it so
that there is practically no loss regarding the filter surface.
The plate 15 supporting the filter material 11 or the folds 14 of
the filter material can be of any suitable material, e.g. strips of
of thin metal sheet, but also of an inherently stable plastic
material.
If need be, the plate 15 may be provided with a reinforcement along
its straight edge 16. This reinforcement can, in the case of a
metal plate, be formed by the flanged edge, or by a bead,
particularly when the plate is of plastic material.
With the filter cartridges of the type in question, the zig-zag
folded filter material is commonly supported on the discharge side,
usually with a perforated sheet or grid. This support material is
bound to impair the discharge of the gas having passed through the
filter material, to a greater or lesser degree. This disadvantage
can be avoided with the filter cartridge formed according to the
invention if the plates 15 inserted in the folds 14 of the zig-zag
folded filter material 11 are supported at their ends, at the rear
zig-zag formed edge 17, by a flange which, for example, can be
arranged on the top and bottom of the filter material of the filter
cartridge. With such a formation there is no need for supporting
the zig-zag folded filter material in the hitherto customary
manner.
* * * * *