ENSEMBLE ASPIRATEUR, CAGE EN TREILLIS, ET SAC DE CAPTAGE A FIXATIONS POUR DEPOUSSIEREUR INDUSTRIEL

REMOVABLE AIR INDUCER, WIRE CAGE, AND FILTER BAG WITH HOLD DOWN ARRANGEMENT FOR INDUSTRIAL DUST COLLECTORS COLLECTORS

Abrégé anglais

ABSTRACT
A removable air inducer, wire cage and filter bag or
tube for use in a dust collector wherein the air
inducer, wire cage and filter bag are mounted on a
support plate and open at the bag end secured to the
support plate to allow air flow from bag house to
plenum chamber and vice versa; in this invention the
wire cage to the support plate member in dust
collectors. Conventionally, the type of dust collector
referred to is one comprising a hopper for collecting
filter dust and other particulate matter separated
plurality of air inducers, filter bags and cages
therein and a plenum chamber through which is emitted
the dirty air for cleaning, the cleaned air, cleaning
air, or a combination of these, in all such types we
refer to, there is an air inducer, a large, hollow,
inverted frusto conical body concavely curving outwardly
at the base area and at the top of the body extending
outwardly into a circular flange then vertically upwards
into a short cylindrical portion, the top of which
merges into a semicircular outer lip. Filter bag
and wire cage support member between the plenum
chamber and baghouse. Prior to our invention it was
the practice to clamp the filter bags to a fixed air
inducer by clamping means situated solely within the
baghouse.

Revendications

The enbodiment of the invention in which an exclusive
property or privilege is claimed is defined as follow:
1- An improved clamping arrangment in combination with
a dust collector and a plurality of top loaded uni-
tary assemblies of air inducer-wire cage-filter bag
wherein:
(a) the air inducer is an inverted frusto conical
body concavely curving outwardly at its downwardly
disposed base portion and at its upper portion for-
ming an annular flange extending vertically upwardly
into a short cylindrical portion which emerges into
a semicircular outer lip providing a first bearing
surface,
(b) the wire cage of unitary construction spot welded
peripherally to the air inducer adjacent the annular
flange thereof and
(c) the filter bag fitted over the wire cage compri-
sing an open top cylindrical fabric structure with
the open top folded and stitched over a rope core,
which provides a second bearing surface adjacent the
outer lip, the improvement comprising:
an apertured support plate in the dust collector for
top loading the unitary assemblies into said dust
collector, said support plate having threaded bolts
welded to the plate and extending upwardly to co-
operate with square apertured retainer plates and fas-
tening nuts for retaining the unitary assemblies in
operating position;
said threaded bolts being disposed such that each
unitary assembly is clamped at four equidistant points
around its periphery by said retainer plates co-ope-
rate with the first bearing surface and the support
plate co-operate with the second bearing surface.
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Description

113156~
SPECIFICATIONS
The following is a detailed description of our preferred
embodiments in connection with the drawings in which:-
Fig. 1 is a general schematic front view partially in
section of a dust collector of the type generally referred
to herein for practicing our invention;
Fig. 2 is a plan view partially in section of the air
inducer clamping arrangement of our invention; and
Fig. 3 is a front view detail of the air inducer~ wire
cage and filter bag clamping arrangement.
In Fig. 1 there is shown a plurality of air inducers~
wire cages and filter bags which are suspended from
support plate member and clamping arrangement.
In Fig. 2 and 3 there are shown the means by which each
of the air inducers~ wire cages and filter bags are
clamped to and supported from support member 5. The
air inducer 3 is a large, hollow, inverted frusto conical
body concavely curving outwardly at the base area and~
at the top of the body, extends outwardly into a
circular flange then vertically upwardly into a short
cylindrical portion~ the top of which merges into a
semicircular outer lip. The bags 1 are of cylindrical
shape and are u~ually made of any suitable fabric~
such as synthetic or natural woven cloth or felt~
or the like~ depending on the environmental conditions
to which they will be exposed. The top portion is
folded over a rope core and stitched. Each bag is
reinforced at its inner surface to prevent it from
collapsing to an undesi~rable degree by a one piece cage
member 2 of conventional wire screen construction.
_ - 3 -

1131566
The air inducer, wire cage and filter bags are locked
or clamped to the support plate by means of a 1/2"
bolt ~ welded to the support plate 5 followed by a
square shaped plate 7 as seen in Fig. 2. Each air
inducer is clamped at four equidistant points of its
periphery by the square plates which press downwardly
into sealing engagement of the air inducer~ wire cage~
filter bag and support plate by means of tightening
nut 6 and plate 7.
~ecause of its square shape~ the plate lends itself
to quick disassembly of the air inducer~ wire cage
and filter bags as shown in Fig. 2. ~ihen disassembling
the bags for inspection, it is merely necessary to back
the nut 6 off several turns, thereby freeing air inducer,
wire cage and filter bag so that they may be manually
withdrawn.
Our invention provides an arrangement wherein the
necassity of having to enter the dirty baghouse to
install~ repair and inspect the air inducers, filter bags
and wire cages is eliminated. Our invention provides a
much more simplified and efficient means of clamping
the air inducer1 filter baB and wire cage to the bag
support member than heretofore known9 and provides an
easily accessible clamping arrangement wherein the
need for entering the baghouse is totally eliminated.
The air inducer has permanent securement to the wire
cage by a series of spot welds~ where the top of the
body of the air inducer extends outwardly into a
circular flange at the top of the wire cage.
3o

~131566
The ?rocess previously used which is intended to be
improved by resorting to our invention is as follows:-
(a) The air inducers are flanged and welded to the
bag support wnich makes them unremovable; and
(b) The filter tube and wire cage is placed over the
air inducer and held in place by a tridon cla~p.
The difficulties and inconveniences involved are:-
(a) ~eplacement of the bags necessitates shut down of
the complete operation; and
(b) The baghouse must be entered to remove the clamp
and then remove the filter bag and cage. As there
may be 250 of these bags to a unit~ it is a very
difficult ~ob to replace them. Inconveniences
involved are that the complete operation has to
be shut down, and high labor costs.
We have found that these disadvantages may be overcome
by our invention of a removable air inducer~ filter
bag and wire cage~ the complete unit being removable
from the top of the dust collector without entering
the baghouse.
- 5 -
~,.

-- 11315~
Prior to our invention, it was the practice to have
the air induser welded to a permanent bottom support
structure provided for attachment both to the bag
support member and the wire cage and the filter bag,
the wire cage and filter ba8 being held in place to
the bottom support structure with a conventional
adjustable band clamp or a metal ring. The dis-
advantages of this arrangement were that as the air
inducer and bottom support structure were welded to
the body of the dust collector it was necessary to
enter the dirt,y bag house to remove and replace the
filter bags and wire cages on each one. It was a'so
necessary to remove and replace the conventional
adjustable band clamp depending on the size of the
unit. This could require as much as a week's time,
and the complete operation would have to be shut
down in the meantime.
--6--

1131S6~;
The hold down arrangment means comprises at least one
fastener, said fastener including a vertical threaded
stud means secured to said filter bag support member,
an apertured plate loosely fitted on said stud means
for rotation relative thereto.
Air inducer means a large, hollow, inverted frusto
conical body concavely curving outwardly at the base
area, the top of the body extending outwardly into a
circular flange then vertical upwardly into a short
cylindrical portion, the top of which merges into a
semicircular outer lip designed so that a permanent
support structure is eliminated.
Said filter bag means an elongated porous filter element
being open at one end, a flange extending outwardly from
said open end and said flange including a substantial
rope core means of greater outer dimension than the
aperture of said filter element support member. Thus
when installing the bag from the top support plate the
bag may be dropped through the opening into the area
of the bag housing without fear of its falling through.
Each bag is reinforced at its irner surface to prevent
it from collapsing to an undesirable degree by a one
piece cage member, said cage means comprising a plura-
lity of annular sections vertically disposed relative
to one another and extending the full lenght of the
respective said bag, said section being of wire screen
including a plurality of spaced horizontal and vertical
rods.
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