U.S. patent number 3,581,470 [Application Number 04/889,142] was granted by the patent office on 1971-06-01 for electronic air cleaning cell.
This patent grant is currently assigned to Electro-Air Division, Emerson Electric Company. Invention is credited to Paul Aitkenhead, Lewis G. McClintock, Robert Ruhlman.
United States Patent |
3,581,470 |
Aitkenhead , et al. |
June 1, 1971 |
ELECTRONIC AIR CLEANING CELL
Abstract
An electronic air cleaner having a series of alternate groups of
parallel collecting plates, each group having spaced aligned
predrawn holes and clearance holes and sections of metal tubes of
equal length expanded and locked in precise position in the aligned
drawn holes of each group and passing through the clearance holes
of another group of collecting plates. The metal tubes are rigidly
held between spaced parallel panels to equally space the groups of
collecting plates therebetween and a means to maintain lateral
alignment of the metal tubes is provided to maintain the alternate
groups of collecting plates in position and equally spaced in
parallel relation to each other. The metal tubes are preferably
expanded to a nonround shape such as rifled or polysided to enhance
engagement with the plates. The preferred end panel is conductive
with spaced cutouts having overlying insulating plates with at
least one tube aligning hole. The plate is loosely attached to the
end panel to permit alignment of the holes with selected conductor
tubes. Depressions are also provided in the panel for other
selected tubes to permit engagement of the tube ends with the end
panels in the same plane.
Inventors: |
Aitkenhead; Paul (Ross
Township, Allegheny County, PA), Ruhlman; Robert
(Pittsburgh, PA), McClintock; Lewis G. (Pittsburgh, PA) |
Assignee: |
Electro-Air Division, Emerson
Electric Company (N/A)
|
Family
ID: |
25394576 |
Appl.
No.: |
04/889,142 |
Filed: |
December 30, 1969 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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530993 |
Mar 1, 1966 |
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Current U.S.
Class: |
96/79;
29/726 |
Current CPC
Class: |
B03C
3/47 (20130101); B03C 3/86 (20130101); Y10T
29/53113 (20150115) |
Current International
Class: |
B03C
3/86 (20060101); B03C 3/34 (20060101); B03C
3/45 (20060101); B03C 3/47 (20060101); B03c
003/00 () |
Field of
Search: |
;55/138,139,143,145,146,151,154,137,136 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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155,913 |
|
Mar 1954 |
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AU |
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668,698 |
|
Mar 1952 |
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GB |
|
Primary Examiner: Talbert, Jr.; Dennis E.
Parent Case Text
CROSS REFERENCE
This application is a continuation-in-part of application Ser. No.
530,993, filed Mar. 1, 1966, now abandoned, for Method and
Apparatus for Manufacturing Air Cleaner Cells.
Claims
We claim:
1. An electronic air-cleaning collector cell consisting of a series
of alternate parallel collecting plates providing interleaved
groups of different polarity, a plurality of aligned mounting holes
and clearance holes in each group of collecting plates, conductor
tubes in said mounting holes to support their respective group of
collecting plates of one polarity and spaced from each other and
passing through said clearance holes of alternate groups of
collecting plates of different polarity, a pair of spaced opposed
end panels on opposite sides of and parallel with said alternate
series of collecting plates, said end panels having holes matching
the location of the bores of said conductor tubes but smaller than
the outside diameters of said conductor tubes, means cooperating
with said conductor tubes and panel holes to abut and secure the
inside faces of said end panels against the ends of all of said
conductor tubes to maintain said alternate groups of collecting
plates aligned and in equally spaced parallel relation with each
other in said electronic air-cleaning cell, and insulating means on
said end panels to insulate said conductor tubes of different
polarity.
2. The electronic air-cleaning collector cell of claim 1 which also
includes a nonround expanded outer surface on said conductor tubes
interlocked in their reshaped respective collector plate-mounting
holes.
3. The electronic air-cleaning collector cell of claim 2 which also
includes a bore of nonround configuration in said conductor tubes
which formed said expanded conductor tube surfaces interlocking
their reshaped respective collector plate-mounting holes.
4. The electronic air-cleaning collector cell of claim 3 which also
includes a spiraled bore in said conductor tubes which expanded
said conductor tube surfaces in their interlocked and reshaped
respective collector plate-mounting holes.
5. The electronic air-cleaning collector cell of claim 2 including
a nonround polygonal bore as said nonround bore in said conductor
tubes which formed said expanded conductor tube surfaces in their
interlocked and reshaped respective collector plate-mounting
holes.
6. The electronic air-cleaning collector cell of claim 1 including
selected of said conductor tubes of matched gauge length.
7. The electronic air-cleaning collector cell of claim 1 wherein
all of said conductor tubes supporting said conductor plates are of
equal length to space said conductor plates equally from each
other.
8. The electronic air-cleaning cleaning collector cell of claim 1
including predrawn mounting holes in said interleaved collector
plates each having a frustoconical section extending beyond the
plane of its collecting plate, said expanded exterior surface of
each conductor tube having changed the shape of said conical
section to interlock with said predrawn mounting hole to retain
said plates in uniform spaced relation.
9. An electronic air-cleaning collector cell including spaced
opposed end panels with outward extending parallel flanges, a
series of alternate parallel collecting plates each having aligned
clearance and mounting holes, said mounting holes fixed on spaced
and expanded conductor tubes of different polarity and of equal
length with their ends against the inner faces of said opposed end
panels, insulation means between said conductor tubes on said end
panels carrying those tubes to receive a charge, and bolt means
extending through said end panels and selected of said conductor
tubes to clamp said end panels against said conductor tubes to
support said series of collector plates for the width of said
cell.
10. The structure of claim 9 including a unitary ionizing ground
plate shaped to form upper and lower parallel bars with uniformly
rearwardly struck equally spaced parallel ionizing electrodes
therebetween, spaced insulators on each bar supporting opposed bus
rods above and below the ends of said rearwardly struck ionizing
electrodes and between which are suspended ionizing wires
substantially centered between said ionizing electrodes, a flange
extending rearwardly from the top and bottom marginal edges of said
upper and lower bars of said ionizing ground plate, and the outer
ends of said bars of said ionizing ground plate secured to the
front flanges of said end panels.
11. An electronic air-cleaning cell including opposed spaced cell
end panels with parallel edge flanges, a series of alternately
disposed collector plates providing groups of different polarity
and with spaced clearance and predrawn mounting holes, spaced and
expanded conductor tubes of equal length with their ends abutting
against the inner faces of said end panels, insulation means
between said conductor tubes and said end panels to insulatingly
support said conductor tubes of different polarity from each other,
hole means in said end panels smaller than the outer diameter of
said conductor tubes and aligned with the bores of said conductor
tubes each to receive an aligning means, selected of said panel
hole means and conductor tubes receiving bolt stems with their
heads against the outer face of one panel and bolt fastening means
against the outer surface of said other panel to secure said end
panels in clamping engagement against the ends of said conductor
tubes to equally space said collecting plates from each other and
support them relative to said parallel flanges, a unitary ionizing
ground plate having upper and lower parallel bars with rearwardly
struck uniformly spaced parallel ionizing electrodes, spaced
insulators on each bar carrying opposed bus rods above and below
said ionizing electrodes, ionizing wires suspended between said bus
rods and substantially centered between said ionizing electrodes to
complete the ionizer, and the opposite ends of said ionizing ground
plate bars secured to said parallel flanges of said panels.
12. The electronic air-cleaning cell of claim 11 which also
includes a flange extending rearwardly from the top and bottom
marginal edges of said upper and lower bars of said ionizing ground
plate to overlie top and bottom parallel flanges on said end
panels.
13. The electronic air-cleaning cell of claim 11 which also
includes an opposed top and bottom having inturned marginal side
flanges extended beyond the side flange of said end panels with the
intermediate portion of the ends of said top and bottom secured to
top and bottom marginal end flanges on said end panels to form
opposed troughs on the up and down stream sides of said cell to
receive mechanical filter screens and add to the rigidity of said
cell.
14. The electronic air-cleaning cell of claim 11 which also
includes end panels of insulating material with marginal side
flanges, top and bottom cross angles secured to each of said end
panels to provide top and bottom end flanges.
15. The electronic air-cleaning cell of claim 11 which also
includes opposed upper cutouts in said end panels of metal and
closed by overlying attached insulating plates for each upper
charge-carrying tube, opposed lower cutouts in said end panels
closed by lower attached insulating plates to receive the ends of
said conductor tubes, said attached insulated plates loosely
attached to said end panels to permit alignment of their aligning
conductor tube holes with the bores of said conductor tubes, and
independent depressions in said steel panels for selected grounded
tubes to compensate for the cutout to equalize the spacing between
said end panel surfaces.
16. The electronic air-cleaning cell of claim 15 which also
includes a conductor strap means connecting said charged tubes on
the outside of said lower insulating plates for lateral electrical
cell connection to an energy source.
17. The electronic air-cleaning cell of claim 16 which also
includes a conductor strap on each of said lower insulating plates
connected to the adjacent end of said ionizing wire bus rod for
lateral electrical end connection on either end panel side of said
cell to an energy source.
18. An electronic air-cleaning cell end panel comprising a metal
panel member having spaced cutouts, insulating plates overlying
selected of said cutouts and having at least one aligning hole
therethrough, and attachment means loosely securing said insulating
plates to said end panel member to permit alignment of said holes
with selected collecting plate conductor tubes, and depressions in
said panel members for other selected collecting plate conductor
tubes to compensate for the depth of said cutouts thereby
permitting the ends of said tubes to engage said end panel in the
same vertical plane.
Description
SUMMARY OF INVENTION
This invention relates generally to electronic air cleaners and
more particularly to an improved collecting cell.
Electronic-collecting cells usually consist of a series of spaced
electrodes insulatingly supporting therebetween an alternate series
of positive ionizing wires in front of an alternate series of
positively and negatively charged collecting plates which attract
the ionized particles of dirt carried therethrough by forced air
flow.
It is a serious problem to construct these collecting cells
economically and at the same time to make them efficient and
uniform in their production.
The principal object of this invention is the provision of a new
and improved collecting cell permitting uniform, new and novel
production technique to carry out the making of some parts and
assembly of the same and to provide a collecting cell which is
economical to construct yet has great longevity and
dependability.
The electronic air-cleaning collector cell of the present invention
consists of a series of alternate parallel collecting plates
providing plate groups of different polarity. The plates are
provided with a plurality of aligned mounting holes and clearance
holes in each group of collecting plates with conductor tubes
positioned in the mounting holes to support their respective group
of collecting plates of one polarity and passing through the
clearance holes of alternate groups of collecting plates of
different polarity. Parallel end panels are provided with holes
matching the location of the bores of the conductor tubes, but the
holes are smaller than the outside diameters of the conductor
tubes. The conductor tubes are aligned with their respective end
panel holes and secured such that the tube ends about the inside
faces of the end panels. Thus when the end panels are thus secured
or drawn in towards each other to engage all conductor tube ends,
the alternate groups of collecting plates will automatically be
aligned and placed in equally spaced parallel relation with each
other in the electronic air-cleaning cell. Insulating means are
provided on the end panels to insulate the conductor tubes of
different polarity.
Thus, assuming that the opposed inside surfaces of the end panels
which engage the tube ends are each respectively equally spaced,
then each conductor tube is of equal length. Thus, before the end
panels are applied to the collecting cell unit, the spacing between
the adjacent collector plates may be gauged and the tubes then
simultaneously cut to equal length. When the cell is inserted
between the end panels and the end panels are brought together
against the ends of the tubes and there secured, the correct
spacing will automatically be assumed and maintained.
Bolt means may be extended through the end panels and selected of
the conductor tubes to clamp the end panels against the conductor
tubes.
The mounting holes in the collector plates which receive and
tightly engage the conductor tubes, are preferably predrawn to
provide a frustoconical opening that does not have a cylindrical
surface but always changes along the cone. The drawn holes are
punched to provide a smaller opening drawn into a bell with a
frustoconical section that has a steep angle to provide greater
surface engagement on the tube than the mere thickness of the
material of the plate. This drawn frustoconical hole is thus
tightly seized and clamped when the tube is expanded therein
without deflecting the surface planes of the plates. This is due to
the fact that the outer portion of the frustoconical drawn section
engages the tube whereas the bell-shaped portion of the drawn hole
is free of the tube. When the tube is expanded it does not engage
within the parallel planes of the plate and thus does not misshape
the same.
The expanded conductor tubes are preferably expanded to a nonround
outer surface thereby providing a novel and much more secure
interlock with their respectively reshaped collector plate mounting
holes thus providing assured engagement and spacing. The conductor
tubes may be expanded to their nonround shape to engage the
predrawn holes by rifling the tube bore with a rifling expansion
mandrel or by expanding it to a polysided configuration. Thus
engagement with the conductor plates is enhanced over the structure
which is constructed by drawing a rounded mandrel through the
conductor tubes to expand the same.
Furthermore, the drawing of a rounded mandrel through the conductor
tube bores causes the tubes to stray or bend laterally from their
axial position away from each other thereby distorting the flat
conductor plates. This takes place particularly adjacent the ends
of the cell. The rifling expanded conductor tubes of the collector
cell of the present invention provide a collecting cell unit which
has no distorted plates as the expansion by rifling prevents
lateral wandering or bending of the tubes.
Each tube is abutted against the spaced parallel end panels of the
cell and selected of them are secured by headed coaxial rods in the
tubes with a speed nut. The top and bottom of these insulating
plates are secured together by flanged metal angular sections to
support the ionizing frame at the front of the cell, an optional
large mesh screen at the front and the removable screen at the back
to catch the large gobs of dirt that are apt to be blown from the
plates after being permitted to accumulate too long a period of
time.
The collecting cell unit is also provided with a unitary ionizer
ground plate having upper and lower parallel bars with rearwardly
struck uniformly spaced parallel ionizing electrodes. Spaced
insulators are provided on each bar carrying opposed bus rods above
and below the ionizing electrodes with ionizing wires suspended
between the bus rods and substantially centered between the
ionizing electrodes. Opposed top and bottom panels are provided
having inturned marginal side flanges which extend beyond the sides
of the end panels to form opposed troughs on the up and down stream
sides of the cell to receive mechanical filter screens and add to
the rigidity of the cell structure. These top and bottom panels are
secured at their ends to their end panels. To facilitate this, the
end panels are provided with end flanges.
The end panels are preferably and novelly metal panel members
provided with spaced cutouts. Insulating plates overlay selected of
these cutouts and are provided with at least one aligning hole. The
insulating plates secured loosely to the end panel members to
permit alignment of the holes with selected collecting plate
conductor tubes. Depressions are provided in the same panel members
for other selected collecting plate conductor tubes in order to
place the face of the bottom wall of such depressions which will
contact a tube end in the same plane as the insulating panel faces
which will also engage tube ends thereby compensating for the depth
of the cutouts. This structure provides a much more economical end
panel with ease of manufacture.
Those conductor tubes not having a bolt passing therethrough may be
aligned and secured relative to their respective end panel holes by
tapered cylindrical-shaped lock lugs which may be forced into the
alignment holes in the end panels and on into the bore of the
tubes. Such lock lugs are provided with flanges which engage the
inside surface of the end panels upon insertion thereby preventing
dislodgment.
Conductor straps may be provided on the outside of a selected
insulating plate and connected to selected of the conductor tubes
to permit lateral electrical cell connection to an energy
source.
Other objects and advantages appear hereinafter in the following
description and claims.
The accompanying drawings show, for the purpose of exemplification
without limiting the invention or the claims thereto, certain
practical embodiments illustrating the principles of this invention
wherein.
FIG. 1 is an enlarged perspective view of a portion of pairs of
metal collecting plates showing clearance holes and predrawn holes
secured to tubes and fastened to an insulating panel.
FIG. 2 is an enlarged sectional view through a pair of collecting
metal plates showing the drawn hole and the expanding mandrel.
FIG. 3 is a perspective view of an open stacking jig with a plate
feeding tray showing the cell elevator in its raised position.
FIG. 4 is a perspective view of two E-shaped jig members with a
spacer therebetween.
FIG. 5 is a perspective view of the open stacking jig with the
plate-feeding tray forward and a portion of the plates stacked in
the jig.
FIG. 6 is a perspective view looking over the plate feeding tray on
top of the open stacking jig.
FIG. 7 is a perspective view of the closing of the stacking jig
illustrating the relative position of the top spacers about to
enter the spacers supporting the plates in the jig.
FIG. 8 is a perspective view of the closed stacking jig with the
tubes partially inserted in their respective aligned predrawn
holes.
FIG. 9 is a perspective view of the act of expanding the tubes in
the predrawn holes of the plates locked in the jig.
FIG. 10 is a perspective view of the open jig with the elevators
having raised the interleaved plates free of the jig spacers.
FIG. 11 is a perspective view of a jig to properly space the
interleaved plates from each other on a carriage to prealign the
tubes.
FIG. 12 is a perspective view of moving the interleaved and jigged
held plates through dual saws to make the tubes gauging points.
FIG. 13 is an enlarged perspective view of a portion of a completed
cell with parts broken away.
FIG. 14 is a diagrammatic plan view of the punching and stacking
apparatus.
FIG. 15 is a circuit diagram for energizing the electronic air
cleaning cell of this invention.
FIG. 16 is a circuit diagram for energizing a three phase
electronic air cleaner cell of this invention.
FIG. 17 is an enlarged view partly in section showing a conductor
tube with a spiral bore of predetermined configuration abutting an
insulating end panel with a spring locking lug holding the same in
position.
FIG. 18 is a front elevational view in section with portions broken
away showing an electronic air cleaning collector cell with the
collector plates supported by conductor tubes and having metal end
panels with insulated inserts. The vertical front section is taken
along line 18-18 of FIG. 19 for the upper two thirds of the
figure.
FIG. 19 is a view in side elevation of the metal end panel of the
cell shown in FIG. 18.
Referring to FIGS. 1 and 2 of the drawings the energized or
positively charged plates 1 are spaced from the grounded or
negatively charged plates 2 by the interlocking between each of the
respective plates and their corresponding tubes. The tubes 3 are
secured to the positive plates 1 and the tubes 4 are secured to the
negative plates 2. This is more clearly demonstrated in the
enlarged view of FIG. 2 wherein the plate, regardless of which
plate it might be, is provided with a drawn hole 5 which consists
in a bell end 6 and a frustoconical end 7, which before the tube is
expanded in the predrawn hole having a frustoconical section 7, is
truly a frustoconical section preferably without any cylindrical
sections along the bore thereof. It should be noted that the
predrawn hole of frustoconical section including the bell 6 is
completely offset or beyond the parallel planes 8 and 10 which
define the opposite sides of a plate.
The tubes 3 and 4 before being inserted into the predrawn holes 5
has a three-eighths or 0.1875 of an inch outside diameter. The
inner diameter of the tubes 3 and 4 are approximately 0.305 which
is slightly less than five-sixteenths which is 0.3125 of an inch.
Thus the tubes will readily move into the bell 6 and through the
drawn opening 5 of a stacked section of plates without much
resistance and when the mandrel 11 with its head 12 is drawn
therethrough it is gauged to increase the size of the tube
approximately 1/64 or 0.11312 of an inch which is sufficient for
the expanded tube to grasp a substantial portion of the bell
predrawn hole 5 and lock it firmly in position providing a good
mechanical connection as well as a good electrical connection.
As shown in FIG. 1 for every series of drawn holes 5 there is a
corresponding clearance hole 13 as each of the tubes 3 and 4 are
preferably adjacent each other and parallel. Although the end of
the frustoconical portion of the drawn hole 5 may extend
approximately halfway between adjacent plates, the clearance hole
13 is of sufficient size to provide substantially the same distance
between the end of the frustoconical portion of the drawn hole 5
and the actual tube surface passing through the clearance hole 13
as shown in FIG. 2.
The mandrel 11 has a head 12 which is provided with an initial
tapered section and a trailing tapered section with an intermediate
cylindrical gauging section 14. This section 14 is longer than
either the tapered sections fore and aft beginning at a diameter
equivalent to that of the inner diameter of the tube. Of course,
the stem of the mandrel is much smaller than the inner diameter of
the tube but the important initial tapered section only becomes
effective when its diameter reaches the inner diameter of the tube.
Different other modes of expanding the tubes may be practiced. One
that is very old in the art is the use of a ball with a hydraulic
fluid. However, in this application there are 10 tubes in all and
they may be expanded at the same time by employing the mandrel 11
each provided with an expanding head 12.
A jig is shown in FIG. 3 for receiving each of the plates having
been punched with a required alternate series of drawn holes 5 and
clearance holes 13. The jig, generally speaking, is provided with a
stand 15 which supports a table 16 that carries a back gauge plate
17 and a front plate 18 and a rear plate 20. These plate members
are secured together to the table and are preferably made of heavy
stock for long wear and for enabling a tight clamping arrangement
of the inserted plates of the cell.
As shown in FIG. 3 a hoist or lifting cylinder 21 is shown
underneath the table surface 16 and provided with a piston rod 22
that operates the crosshead 23 carrying at least four guide members
24 that are connected together at the crosshead 23 and also at the
elevator platform sections 25 and 26. As shown in FIG. 3 these
elevator platform sections are raised above the jig which is shown
fully extended for the purpose of lifting the cell out of the jig
which is illustrated in FIG. 10. Wherein the cell 27 is supported
by the elevators 25 and 26 above the whole of the jig.
In the open jig shown in FIG. 3 there are illustrated sets of
spacer members 28, one row at the back of the jig indicated at 30,
one row at the center of the jig as indicated at 31 and one row at
the front of the jig as indicated at 32. These E-shaped members 28
have their upper ends cut at a slant as illustrated at 33 in FIG. 4
and when stacked in the jig are bolted together along their lower
end by means of bolts passing through appropriate holes to tightly
clamp them together and to the front and rear plates 18 and 20. A
spacer plate 34 is positioned between the horizontal common
connecting bar of the E that has the upwardly projecting fingers
forming the E-shaped spacers 28. Thus the bottom of the E-shaped
spacers 28 are separated by a spacer 34 that may be the same gauge
as the plates 1 and 2 or may be slightly heavier gauging than these
plates depending upon the capability of tightly clamping these
plates in position. Each of the plates are uniformly stamped and
alternately stacked as indicated at 35, as a positive and negative
plate but they are preferably gauged so as to have the same total
width and length and when each plate is independently inserted
between the groove made by the sloping faces 33 of the E-shaped
member they are shoved to the bottom or the surface of the spacer
34 as the gauge surface and at the same time against the rear gauge
plate 17. Thus the bottom spacers 34 and the rear gauge plate 17
function to square each of the plates inserted in the jig. This
automatically aligns the dual sets of holes and when the plates 1
and 2 are alternately positioned progressively in this jig each of
the proper drawn holes 5 will be aligned and the alternate plates
with their clearance holes 13 also will be properly aligned.
As previously stated when the plates are inserted in the jig, the
bell 6 of the drawn holes 5 all face the same direction which would
be toward the front plate 18 since this is the end that the
mandrels 11 with their heads 12 are inserted.
As shown in FIG. 3 a stack 35 of alternate plates 1 and 2 is placed
on the movable tray 36 and sloped slightly to the back of the
stack. These punched plates are readily inserted in the jig but
first the elevator platforms 25 and 26 must be lowered to a
position below the gauged spacers 34. It may be desirable to use
the elevator surfaces 25 and 26 as the gauge surfaces in which case
the elevator is provided with adjustable stops so that the top
surface of the members 25 and 26 function as the gauge for the
insertion of the plates which may be slightly above the surface of
the spacers 34 or halfway up the jig.
Referring now to FIG. 5 the elevator has been depressed to lower
the surfaces 25 and 26 so as to admit the alternate plates 1 and 2
of the stack 35 down in between the adjacent E-shaped spacers in
the three rows 30, 31 and 32. As shown in FIG. 5 the plates have
been inserted for substantially half of the jig and as illustrated
these plates extend only halfway down the jig because the plates
shown at 37 are not as deep as the jig. As shown in FIG. 5 the cell
has not be completed and additional plates will be inserted from
the tray 36 to finish this cell. It will also be noted that the
exposed end of the plates protrude from the ends of the E-shaped
spacers showing a space indicated at 38.
The tray 36 is mounted on the carriage 40 which is supported by the
wheels 41 and journaled on the stationary frame member 42. Thus the
frame 42 may extend the carriage tray 36 forwardly out over the jig
to substantially the front wall 18.
As shown in FIG. 6 the back of the tray 36 is provided with a
sloping push plate 43 which in turn is mounted on the end of a rod
44 that passes through the backplate 45 of the tray 36 and extends
rearwardly to the crosshead member 46. A coil spring 47 encircles
the rod 44. A cable 48 is secured at one end indicated at 50 to the
crosshead 46 and has its first pass on the pulley 51 supported from
the mounting plate on the rear of the backplate 45 and thence on
its next pass to the pulley 52 pivotally supported from the
crosshead 46 and the next pass travels to the third pulley 53 on
the mounting plate on the rear of the backplate 45 and thence
rearwardly to where it is fastened at 54 to a stationary frame 15
of the machine. A motor 60 is mounted on the frame 15 and is
provided with a rotary electrical clutch mechanism indicated at 56
supplied by current through spaced collector rings and brushes. The
motor 60 may continuously rotate the sprocket 57 and when the
clutch 56 is energized, the clutch 56 will chuck the threaded rod
49 to feed the tray 36 forward as the tray is fed forward by the
threaded rod 49 secured to the carriage frame 40 at 55. Thus, the
clutch 56 is provided with threaded arcuate clamp members for
threaded engagement with the threaded rod. The clutch 56 is driven
by the gear 57 operated by the chain 58 which in turn is driven
from the sprocket 59 of the motor 60.
The rotary clamping chuck 56 is provided with a pair of slip rings
61 and 62 which when energized through the brushes 63 and 64 will
actuate the chuck to clamp on the threaded rod to function as a
pushrod to feed the carriage 40 forwardly. As the carriage 40 moves
forwardly the tray 36 at its other end moves out over the jig due
to the cable 48 sliding the rod 44 forward through the backplate 45
and at the same time the plate 43 moves the stack 35 forwardly on
the tray at a predetermined rate to properly present each of the
plates on the front of the stack tray for insertion in the jig. At
the same time the spring 47 becomes compressed because of the cable
48 secured at 54 to the frame 15 at one end and to the crosshead 46
at its other end. When the clutch 56 is released the spring 47
returns the carriage 40 and the plate 43 to their rearmost
positions on the support by the spaced rollers 41 mounted on
stationary rails at the rear of the machine frame 15.
When the jig has been completely filled with the number of plates
that are necessary as illustrated in FIG. 7 the jig is ready for
closing as clearly shown in this figure as well as in FIGS. 5 to
10. The lead or top 65 is hinged at 66 to the rear gauge plate 17
which is beefed up by additional members and is also provided with
a tower 69, shown in FIG. 6, for supporting a counterweight with a
line to the front of the top 65 as illustrated at 67 and as secured
by the plate 68 to the top 65 as shown in FIG. 8. The line 67
passes upwardly over a pulley adjacent the top of the tower and
thence to a weight which counterbalances the actual weight of the
jig top when supported on hinge 66. The top member is made in the
form of a frame having three transverse members 70 which are
secured at their hinged end to the hinged plate 71 and at the front
and to the pillow plate 72 which in turn is provided with a block
73 having a vertical opening to receive the eye of the member 74
and a pin 75 which passes through the block and the eye of the
member 74. When the head is locked downwardly, the cylinder 76 is
energized to pull the piston 77 downwardly and thus tightly force
the jig top member 65 in position as shown in FIG. 8.
When it is desired to open the jig the cylinder 76 is energized in
the opposite direction to raise the same and when partially raised
the locking pin 75 is withdrawn and the top 65 may be raised to its
vertical position as shown in most of the figures such as FIGS. 5
and 10 giving free access to the upwardly open jig. As shown in
FIGS. 3 and 5 three bars 70 are provided with plates 78 which
support a stack of spacing bars 80 and interleaved therebetween a
steel spacer plate 81 for insertion which also engages the sloping
faces 33 of the spacers 28 while the spacer members 80 interlock
with the sloping faces 33 to insure proper adjustment of the plates
in the jig and to retain them against any movement during the
drawing operation. To allow for discrepancy the spacers 80 and
their counter plate spacers 81 are bolted together in each row and
they are suspended on springs to allow the whole assembly to move
back and forth so that they will seek their own proper position
with the lower half of the jig spacer members and thus become
properly interlocked to tightly secure the spacers that have the
plates positioned therebetween. It is believed more important to
have the spacers tighter when the jig is closed than the plates
themselves for the simple reason that the plates 1 and 2 cannot go
anywhere if the spacers 28 and 80 are locked at top and bottom.
When the die has been closed as shown in FIG. 8 the tubes 3 and 4
which are the same are inserted through the large openings in the
front gauge plate 18 and threaded through the corresponding bells 6
of the drawn holes 5 in the plates 1 and 2 and pass rearwardly to
the rear plate 20 as shown in FIGS. 3 and 5. The holes in the rear
plate 20 are insufficient size to receive the tubes but are
sufficient to receive the heads 12 of the expanding mandrels 11.
When all of the tubes have been shoved home they pass inwardly
beyond the inner face of the forward member 18 and are stopped when
they abut the inner face of the rear wall member 20. At this time
the mandrels 11 with their trailing heads 12 are inserted in the
tubes and they are moved rearwardly through the aligned holes 82 in
the wall 20 and interlock in the crosshead 83 on the rear side of
the plate 20 as shown in FIG. 9. The leading ends of the mandrels
11 are provided with a reduced portion 84 which provides a forward
shoulder that is interlocked in the connected and laterally
slidable plates 85 which are actuated by the lever 86 that is shown
in FIG. 9. The plates 85 are provided with bayonet-type slots, the
large portion of which is open when the control knob 86 is pulled
away from the machine. This permits the leading end of each of the
mandrels 11 to pass through the plates 85 after they have been
fully inserted. The knob 86 is moved inwardly to engage in the
reduced section 84 as shown in FIG. 9 and thereby lock each of the
mandrels 11 to the crosshead 83. At this time the cylinder 87 as
shown in FIG. 5 is energized to pull its piston rod 88 as shown in
FIGS. 5 and 9 rearwardly. The piston rod 88 is secured to the
bridge member 90 that is in turn secured to the crosshead 83 and
when the piston draws the crosshead 83 rearwardly on the track 91
each of the mandrels are drawn through the tubes 3 and 4 with their
heads 12 expanding the same as illustrated in FIG. 2 for securely
locking each drawn hole 5 to its respective tube. The force of
drawing is applied to the inner surface of the rear wall member 20
and each of the tubes 3 and 4 have the same length and they are
precut so that they are substantially the same length so when they
engage the rear wall they will protrude equidistant beyond the end
plates of the cell when out of the jig, as in FIG. 10. As shown in
FIG. 9 each of the mandrels 11 are drawn rearwardly until they pass
through the openings 82 which clear the head 12 of each
mandrel.
Thus with this single operation all of the tubes in the cell are
expanded simultaneously when the plates of the cell are clamped in
the jig in proper spaced relation. Thus the expansion of the tubes
in each plate of the cell prepositions these plates relative to
each other in accordance with the spacers 28 of the jig. When the
mandrels 11 clear the rear end wall 20, the knob 86 is drawn away
from the machine to unlock the leading end of each mandrel from the
crosshead 83 and permit the mandrels to again be returned to the
stack at the front of the machine as shown in FIG. 3.
When this has been completed the cylinder 76 is energized to extend
the piston 77 until the whole of the head 65 is raised from its
interlocked position as shown in FIG. 7 at which time the pin 75 is
removed and the counterweight is effective to permit the same to be
turned to its uppermost position as shown in FIG. 3.
Since the tubes 3 and 4 clear the inner surface of the front wall
by reason of the fact that they are actually within the initial
spacers 28 and since the other ends of the tubes are against the
inner surface of the far wall, the elevator may be raised by
energizing the cylinder 21 to lift the completed cell out of the
jig as illustrated in FIG. 10. Here the cell 92 rests on top of the
elevator platforms 25 and 26 as shown in FIG. 3 and may be raised
free from the jig. Of course, when the cell 92 is raised, the
plates may move together in one direction or the other because
there is nothing holding them from moving the tubes 3 and 4
longitudinally relative to each other.
The cell 92 is then lifted to the carriage 93 which is supported on
rollers and is provided with the top crossbars 94, the forward end
members 95, the rear end members 96 and a platform made of two
bottom transverse members 97 shown in FIGS. 11 and 12. The upper
surface of the crossmembers 97 and the under surface of the
crossmembers 94 are provided with opposed grooves to receive spacer
members 98. At least two of these spacer members may be slid into
the grooves at each end and in the center of the stack. The spacer
members 98 have long bifurcated sections to fit above or below each
of the tubes 3 and 4 and they are of the proper gauge and thickness
which when inserted in the grooves will maintain the adjacent
plates the same distance apart as that of the jig shown in FIG. 3
without distorting the plates or otherwise straining the fastening
between the tubes 3 and 4 and their respective drawn holes 5.
After the gauge plates 98 have been positioned the carriage 93 is
moved forward between the saws 100 which trim the ends of each of
the tubes 3 and 4 and the cell 92 is thus held in proper position.
This trimming operation is merely a trimming operation. Just a
small amount of metal is trimmed from each end of the tube so as to
properly gauge all of the tubes and after the carriage has passed
completely between the saws the ends of each of the tubes 3 and 4
at opposite ends have been cut to uniform length and provide the
same distance between the ends of the tubes and the respective
plates at the end of the cell.
The carriage is then drawn rearwardly and the gauge members 98 are
withdrawn to release the cell from the carriage leaving the cell
properly gauged for mounting.
As shown in FIG. 13 each cell has mounted on each end thereof an
insulating end wall panel 101 which is provided with molded
marginal side flanges 102 to provide rigidity in these insulating
members. A series of holes are formed in each insulating member 101
which are aligned with the respective tubes 3 and 4 of the cell 92.
The stem of each headed rod 103 is sufficiently small to pass
through the respective tubes 3 and 4 and is inserted through the
holes in both of the insulating end panels 101 and their length is
such that when the head 104 engages its respective insulating end
wall panel and its opposite end projects approximately
three-sixteenths of an inch through the other insulating end wall
panel or sufficient distance to permit the insertion of the speed
nut 105 shown in FIG. 1 at the opposite end of the rod 103 from the
head 104 of each insulated end wall panel. The stems of the rods
103 passing through the tubes 3 also pass through a metal conductor
strap 106 before the speed nuts 105 are applied. One end of each of
these metal conductor straps is provided with a threaded socket 107
which is employed as a positive cell conductor connection, and each
of the negative plates 2 in the stack are grounded. As a
precautionary measure a second conductor strap 108 is extended from
one of the lower rods passing through one of the tubes 4 connecting
the same to the lower metal bracket 109 that extends across the
upper and lower ends of both insulating end wall panels and is
secured thereto.
The lower and upper metal channels 110 and 111 extend across the
lower and upper ends of the two insulating end wall panels 101 and
are secured to the brackets 109 which retain the lower portions of
the cell rigid. Each of these metal channels 110 and 111 are
provided with opposed channel flanges 112. The upper and lower
channel flanges 112 in the front of the cell overlap the
rectangular frame of the ionizing unit.
The ionizing unit comprises a ground plate with two transverse bar
members 113 and 114 connected vertically by a series of uniformly
spaced vertically disposed parallel negative electrodes 115 which
are welded to the upper and lower transverse members 113 and 114
and are ribbed to provide strength. This provides a rigid
reinforcing metal member that not only connects the respective
lower and upper bracket members 110 and 111 but also provides a
mechanically rigid structure in the cell itself.
Two insulators 116 are provided in each of the transverse bar
members 113 and 114 for supporting the charged or positive
electrodes which are in the form of wires 117 suspended vertically
between or on opposite sides of the vertical negative electrodes
115 and one end of which is hooked to a bus bar not shown at the
top and the other end of each wire being hooked to an electrical
spring 120 the end of which is hooked to the lower bus bar 121.
Both bus bars 121 are mounted on the opposite ends of the spaced
insulators 116. The ends of the upper bus bar may be turned
downwardly and provided with a threaded opening 122 to receive a
threaded rod which may pass through either insulated wall member
101 for the purpose of applying a separate positive charge to the
top bus bar and thus to each of the positively charged ionizing
wires 117.
The metal conductor straps 106 with their threaded socket 107
represent a separate voltage connection for the positively charged
plates 1 which in the cell shown in FIG. 13 represents the second
conductor strap adjacent the top or bottom of the insulating end
wall panel 101 whereas the negatively charged plates 2 represent
the inner conductor straps or rows of bolt heads 104 of the cell as
illustrated in FIG. 13 and are connected by the conductor strap 108
to at least one metal bracket across the bottom of the insulated
end wall panels 101.
Thus each end of the cell may have its positive plates
independently connected. Again each end of the cell may have the
positive ionizing wires 117 independently interconnected to the
charge of the circuit. This permits the charging and control
circuit to be mounted on either end of the cell and the mere
removal of this unit from the cell entirely disconnects the same
which is necessary in order to remove the cell and provides a high
degree of electrical safety.
The supply circuit shown in FIG. 15 provides an ordinary
potentiometer in the primary circuit of a high voltage transformer
131, the secondary of which has one terminal connected between a
bank of solid state rectifiers 132, 133, the anode of one of which
is connected to ground and the cathode of the other of which is
connected to the ionizer wires 117. The other side of the secondary
of the transformer is connected between resistor 134, 135, the
other end of one resistor 134 of which is connected to the ionizer
wires 117 and has also connected in parallel therewith a capacitor
136. The other end of the secondary winding is also directly
connected to the positive plates 1. As previously stated the
negative plates 2 and 115 as well as the casing are connected to
ground. Such a current supply is connected to the orginary line
such as 115--120 volt 60 cycle circuit and there is no connection
between the primary and secondary coils of the high voltage
transformer. This provides a very efficient operating circuit for
electronic air cleaners of this character.
The opposed channels 129 between the upper and lower channels 110
and 111 on the rear side of the cell are arranged to receive a
slide, supporting some form of mechanical dust collector that would
catch and hold large globules of dirt that would be knocked from
the adjacent plates by a partial discharge together with the
current of air. Screens of this character are sometimes reusable
but more frequently they are the throw-away type employing some
form of plastic as the texture for catching the dirt that is freed
from the cell.
Referring to FIG. 14, two strips of material 1' and 2' are fed from
two rolls of strip to the single die 123 in the punch press 124.
This dual die punches the positive and negative plates 1 and 2 at
the same time. This dual die punches out the holes 13 and predraws
the holes 5 in each of the plates 1 and 2. This may require a
single or two-stage punching operation but the only or last stage
cuts the plates 1 and 2 from this strip. These plates are shown
protruding from the die 123 and during the next stroke of the die
they become severed and drop into the upwardly open troughs 125 and
126. Since the trough 125 is straight and has a single sharp slope,
the overhanging plate 1 drops onto this straight and steep chute
and thus travels to the pile 127 ahead of plate 2 which travels on
chute 126 a further distance and is not quite so steep. Thus plate
1 is always ahead of plate 2 and they are alternately stacked
automatically in the pile 127 in the tote box 128 which has a
bottom and at least a back and one side. In this manner the bottom
of each stack is always plate 1 and the top is plate 2 when the
stack is removed to the jig for assembly.
The strip is automatically fed to and through the die until the
punched and severed plates drop on their respective chutes 125 and
126.
The three-phase circuit of FIG. 17 is merely a duplication of the
single phase circuit of FIG. 15 with the secondary of the
transformer supplying power from each phase of the three-phase
transformer.
Referring now to FIG. 17, the conductor tube 3 shown is provided
with a nonround expanded exterior surface which follows the
contours of its nonround expanded bore. In this instance, the
expanded spiral or rifled bore was produced by a mandrel having six
lead teeth on its head. The mandrel is rotated as it is drawn
through the tube thereby producing a hexagon cross section on the
outer surface of the tube.
These expanded nonround tube surfaces provide many more advantages
over the straight or round bore conductor tubes because the points
of extreme expansion of the conductor tube outer surface permits
greater lateral expansion extremes of the tube than would be
permitted with a smooth bore expansion. In other words, when a
smooth rounded mandrel is employed to expand the conductor tube,
the characteristics of the metal tube will not permit the entire
outer surface or circumference of the tube to be stretched and
expanded to the extreme radial limit of the outside rifling bulge
of the conductor tube 3 illustrated in FIG. 17. However, when the
tube is expanded to a nonround shape, the most protruding portions
of the expanded tube exterior are permitted by the tube of the same
characteristics to stretch to an outer radial limit which is
greater than that permissible when the entire tube is uniformly
expanded. This therefore permits greater expansion at points about
the tube for more secure interlock of the tube exterior with the
frustoconical portion of a predrawn hole of a respective collector
plate 1 or 2.
Secondly, the uniform cross section configuration of the tube outer
diameter assures better interlock with the respective predrawn
holes than does a smooth conductor tube outer surface with a smooth
predrawn hole interior. Thus the nonround expanded tube
configuration of the present invention provides a tighter
connection with a greater interlock mechanically as well as
electrically.
Another important feature of the spiral or rifled configuration in
particular, is that it has been observed that when a smooth headed
mandrel is drawn through the conductor tubes to expand the same,
that the tubes will no longer remain axially straight and will
wander or bend in a direction transverse to their axis. The result
is that the collector plates 1 and 2 are warped by reason of the
conductor tubes bending away from and towards each other. This
phenomenon particularly occurs adjacent the ends of the cell
structure. By rifling the bores of conductor tubes 3 and 4 to
expand the same, the tubes remain axially straight thereby
preventing any warping of the cell plate structure resulting in a
unit which is extremely dependable and which will not fail during
use by reason of a short occurring between adjacent end collecting
plates.
In FIG. 17, the conductor tube 3 is shown abutting end panel 101
which is provided with alignment hole 140 which is smaller than the
outside diameter of conductor tube 3 and is axially aligned with
the bore thereof. It is not necessary that each and every conductor
tube have a connecting bolt 103 passing therethrough as illustrated
in FIG. 13. In order to prevent the costly use of more of these
bolts 103 than required, selected of the tube ends may be
positioned and held in alignment with their respective aligning
holes in the end panels by means of spring positioning lock lugs
such as illustrated at 141. These lock lugs are cylindrically
shaped and slightly tapered at their forward end 142 and are
provided with an annular outwardly extending shoulder or lip 143
which engages the outer surface of the insulating panel 101. The
spring lug 141 is open for its entire length as indicated at 144 in
order to provide spring resiliency in the radial direction of the
cylindrical shaped lug. The lug is also provided with outwardly
struck locking ears 145 which yield inwardly when the locking lug
is initially forced into the opening 140 as viewed from the
right-hand side of FIG. 17 and subsequently spring outwardly to
their natural position to engage the inside surface of end panel
101 to prevent dislodgment of the locking lug. The tube end is thus
maintained and positioned and aligned relative to the other
conductor tubes of the cell structure and thus connecting bolts 103
need only be provided for half of the conductor tubes as better
illustrated in FIG. 18 and 19.
The collection cell structure of FIGS. 18 and 19 is basically the
same as that previously illustrated in FIG. 13 and others with the
exception of novel features in the end panels and the other panels
making up the outer casing or housing for the collector cell.
The ionizing unit is basically the same as that illustrated in FIG.
13. However, the uniformly spaced vertically disposed parallel
electrodes 115 are made as an integral part of transverse bar
members 113 and 114. Rather than being welded to the latter, the
structure is unitarily constructed by punching out a plate or sheet
to provide the rearwardly struck and uniformly spaced parallel
ionizing ground electrodes.
A unique feature resides in the end panel 146 which in this
instance is metal rather than an insulating material which is much
more costly. The panel member 146 is provided with spaced cutouts
147 with insulating plates 148 attached loosely thereover.
These insulating plates 148 are loosely secured to the metal panel
member 146 by means of rivets 149 to permit slight movement of the
same for required assembly alignment of their aligning holes 140
with the bores of their respective conductor tubes 3 or 4.
Those conductor tubes 4 which are grounded in this instance, need
not be insulated as conductor tubes 3 are and therefore the ends of
conductor tubes 4 may directly abut the grounded metal end panel
member 146. However, in order to compensate for the depth of the
cutouts 147, depressions 150 are provided in the metal end panel
member 146 so that the tubes of equal length will abut the end
panel in the same vertical plane to provide the proper spacing
between alternate groups of the collecting plates.
Referring to the end view of the structure as shown in FIG. 19, it
may be observed that the bottom insulating plate or panel 148 is
provided with a conductor strap 151 on the outside thereof. This
conductor strap is electrically connected through the panel to
conductor bar 152, as seen in FIG. 18, which is in turn
electrically connected to the ionizing bar member 121 to provide a
positive potential on the ionizing wires or conductors 117. Thus,
conductor strap 151 permits end electrical connection of the cell
unit to an energy source by a spring electrical contact or the
like.
The same principal is also applied in the employment of conductor
strap 153 on the outer face of the lower insulating panel 148. This
conductor strap is electrically connected to the lower positive
conductor tubes 3 such that an outside electrical end connection to
an energy source may be readily made to the cell structure by an
electrical spring contact or the like. These conductive end straps
thus eliminate awkward electrical connections when the unit is
installed.
End panel member 146 is provided with side flanges 154 and top and
bottom flanges 155 which provide rigidity to the structure and
available connecting space for securing the end panels to identical
top and bottom channel members 156 and the unitary ionizing
electrode structure consisting of bars 113, 114 and the vertically
disposed negative electrodes 115. As illustrated, these structures
are riveted together by means of rivets 157.
Top and bottom channel members 156 have their inturned side flanges
158 overlapping the sides of end panel 146 in order to provide
opposed top and bottom troughs both on the upstream and downstream
side of the unit to receive mechanical filter screens and to add to
the rigidity of the structure.
* * * * *