U.S. patent number 3,620,234 [Application Number 04/839,400] was granted by the patent office on 1971-11-16 for air-filter-cleaning apparatus.
Invention is credited to Herbert L. Everroad, 688 Pontiac Way.
United States Patent |
3,620,234 |
|
November 16, 1971 |
AIR-FILTER-CLEANING APPARATUS
Abstract
An apparatus for cleaning air filters of the accordion
folded-paper type comprises a housing having two compartments, one
for circulating cleaning fluids from the inside to the outside of a
filter, and the other from the outside to the inside.
Filter-mounting fixtures are provided in the compartments for
effecting the required circulation of fluids. Both air and water
are circulated through the filters in both compartments. Selective
controls are provided to enable either or both of the compartments
to be used.
Inventors: |
Herbert L. Everroad, 688 Pontiac
Way (Denver, CO 80222) |
Family
ID: |
26824356 |
Appl.
No.: |
04/839,400 |
Filed: |
July 7, 1969 |
Current U.S.
Class: |
134/86; 68/189;
134/88; 134/102.1; 134/103.3; 134/113; 134/170 |
Current CPC
Class: |
B01D
41/04 (20130101); B01D 46/2411 (20130101); B01D
46/0071 (20130101); B01D 46/26 (20130101); B01D
46/0082 (20130101); B01D 46/521 (20130101); B01D
2279/60 (20130101) |
Current International
Class: |
B01D
41/04 (20060101); B01D 41/00 (20060101); B01D
46/24 (20060101); B01D 46/52 (20060101); B08b
003/02 (); B08b 005/02 () |
Field of
Search: |
;134/84,85,86,88-91,100-103,113,152,153,168R ;68/189 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Daniel Blum
Attorney, Agent or Firm: McGrew and Edwards
Claims
I claim:
1. An apparatus for cleaning annular cylindrical air filters for
internal combustion engines and the like comprising a closed
housing having two compartments therein, movable closure means
providing open access to said compartments, a first
filter-retaining means in one of said compartments including means
for engaging and closing the ends of a filter and providing an
air-admitting passage at one of the ends thereof, jet means for
spraying liquid over the inner wall of a filter mounted on said
first retaining means, a second filter retaining means in the other
of said compartments including means for engaging and closing the
ends of a filter and for providing an air discharge passage at one
of the ends thereof, jet means for spraying liquid over the outer
wall of a filter mounted on said second retaining means, means for
supplying air to said air-admitting passage and to said other
compartment, means for withdrawing air and liquid from said one
compartment and from said air discharge passage, and means for
discharging the used liquid from said housing.
2. The apparatus of claim 1 including means for rotating said jet
means in both said compartments for maintaining continuous liquid
spray over the inner and outer surfaces respectively of the filters
on said first and second retaining means.
3. The apparatus of claim 1 wherein said air- and liquid-
withdrawing means comprises a centrifugal blower mounted on said
housing and having a branched conduit connecting its intake to the
outlet of said one compartment and to said air discharge passage,
and means for selectively closing the connections to said one
compartment and said air discharge passage.
4. The apparatus of claim 1 including means for controlling the
supply of liquid to said apparatus and including means for
selectively controlling the supply of liquid to both said jet
means, and means for supplying a spray of liquid to the interior of
a filter mounted on said second retaining means.
5. The apparatus of claim 1 including window means in said housing
for affording observation of the interior of said compartments
during operation of said apparatus and observation of liquid
flowing toward said used liquid-discharging means.
6. The apparatus of claim 1 wherein said engaging and closing means
of said first filter-retaining means includes an annular sealing
plate for engagement with the end of a filter adjacent said
air-admitting passage, and telescoping conduit means movable
axially with the plate for providing a sealed air passage to
filters of different lengths.
Description
This invention relates to the cleaning of air filters for internal
combustion engines and the like and particularly to an improved
apparatus for more effectively cleaning such filters.
The accordion folded paper filters commonly employed for cleaning
air supplied to internal combustion engines and the like were
originally intended to be discarded after they had been rendered
ineffective by use. It was, however, found to be possible to clean
such filters for reuse and various methods and apparatus have been
employed for this purpose. U.S. Letters Pat. Nos. 3,021,972 granted
Feb. 20, 1962 and 3,236,249 granted Feb. 22, 1966, both issued to
Herbert L. Everroad, are examples of such filter cleaning
apparatus. It has become desirable to increase the speed and
effectiveness of cleaning and also the average number of times each
filter may be cleaned, and, accordingly, it is an object of the
present invention to provide an improved apparatus for cleaning air
filters of the type employed with internal combustion engines.
It is another object of this invention to provide an improved
apparatus for the effective cleaning of air filters of the
accordion-pleated paper type.
Briefly, in carrying out the objects of this invention in one
embodiment thereof, a cleaning apparatus is provided which
comprises a closed housing having two compartments, each provided
with a retaining assembly for holding a cylindrical
accordion-pleated paper filter unit in position for cleaning. The
compartments are separated from each other and one compartment is
provided with an air-circulating arrangement for directing air from
the center of a filter outwardly through the filter material and
for concurrently spraying the inner surfaces of the filter with a
cleaning liquid which is normally water. The other compartment is
arranged to direct a circulation of air from the outside of the
cylindrical filter unit into the center thereof and out and at the
same time to direct a spray of water about the exterior wall; this
latter compartment may also be provided with a spray for the
interior of the filter. The retainer assemblies are adjustable to
accommodate the filters of different diameters and length. Flow of
water and air may be selectively controlled so that either of the
compartments or both may be maintained in operation at one time.
When utilizing the cleaning method of this invention for cleaning
air filters such as the hollow cylindrical filters utilizing
accordion-pleated paper and employed for internal combustion
engines for heavy equipment the filter is arranged for circulation
of water in a direction opposite to that under which the filter has
been operated, thus the water is directed from the leaving side of
the filter toward the side on which the residue has been
accumulated. At the same time a flow of air is directed through the
filter paper in the same direction as the water so that the entire
area of the filter is subjected to both water and air passing
therethrough. When the water leaving the filter is clear the flow
of water and air is reversed and continued until the water is clear
after leaving the filter. Preferably the filter before being
subjected to the passage of air and water is soaked in a chemical
solution to dissolve or loosen the residue accumulated thereon,
this tends to free the residue and speeds the cleaning of the
filter by the foregoing method.
The features of novelty which characterize this invention are
pointed out with particularity in the claims annexed to and forming
a part of this specification.
The invention itself, however, as to its organization together with
further objects and advantages thereof will best be understood upon
reference to the following description taken in connection with the
accompanying drawings in which;
FIG. 1 is a perspective view of an apparatus embodying the
invention shown open for access to the filter-retaining
assemblies;
FIG. 2 is a piping diagram of the air and water supply system for
the apparatus of FIG. 1;
FIG. 3 is a top plan view of the filter mounting and spray assembly
of the left-hand compartment of FIG. 1;
FIG. 4 is a top plan view of the filter mounting and spray assembly
in the right-hand compartment of FIG. 1;
FIG. 5 is an enlarged elevation view of the lower end of one of the
spray nozzle branches of the assembly of FIG. 3;
FIG. 6 is a top plan view of the portion of the assembly shown in
FIG. 5;
FIG. 7 is a top plan view of the central spray member of the
left-hand filter compartment as shown in FIG. 4;
FIG. 8 is a side elevation view of a closure element for the
discharge openings at the bottom of the filter-retaining assemblies
of FIGS. 1, 3 and 4;
FIG. 9 is a side elevation view of the suction pump and fluid
discharge connections of the apparatus of FIG. 1;
FIG. 10 is an enlarged view, partly in section, of the top air
connection and filter closure assembly of the apparatus of FIG. 1;
and
FIG. 11 is an enlarged sectional elevation view of the bottom
filter mounting assembly of the right-hand filter compartment of
FIG. 1.
Referring now to the drawings, the filter cleaning or rinsing unit
illustrated in FIG. 1, comprises a main housing 10 having a
left-hand compartment 11 and a right-hand compartment 12 separated
by an upright partition 13 and a horizontal floor or partition 14
in the compartment 12. At the right-hand end of the housing 10
there is provided an extension or enclosure 15 in the lower portion
of which is mounted a motor-driven blower unit comprising a motor
16 and a centrifugal blower 17 which is employed as a vacuum pump
to draw air from the compartments 11 and 12 through a duct 18 and
to deliver the air together with entrained water through a
discharge outlet 19 into the lower portion of the housing 10 which
comprises a chamber in direct communication with the chamber 11 and
extending the full width of the housing. On a wall 20 of the
housing extension 15 there are mounted piping connections for water
and high-pressure air indicated generally at 21. Water discharged
from the outlet 19 is removed from the housing through a drain
connection 19a. The compartments 11 and 12 are provided with hinged
doors 8 and 9, respectively, shown resting in their open positions.
When pivoted downwardly these doors close the compartments; windows
8a and 9a are provided in the doors to afford a view of the
interiors of the compartments. The water flowing to the outlet 19a
may be observed through a window 10a in the lower front wall of the
housing, a lamp 7 being provided for better visibility.
The two compartments 11 and 12 are provided with retaining
assemblies for holding filter units indicated at 23 and 24,
respectively. These filter units are of the hollow cylindrical type
comprising inner and outer spaced perforated walls the space being
provided with a suitable filtering material such as
accordion-pleated filter paper arranged with the pleats running
longitudinally of the filters and lying in zigzag configuration in
generally radial positions. This is the type of filter commonly
employed with diesel engines and other internal combustion engines
used with heavy equipment.
As shown in FIGS. 1 and 3, filter-retaining assembly in the
compartment 11 comprises a circular bottom plate 25 rotatably
mounted on an upturned portion 26 of the air duct 18 which in turn
is braced by a bracket securely attached to the housing 10 but not
shown in the drawing. The filter 23 is positioned on the plate 25,
and, as is a common practice with these filters, has a gasket about
its open end which provides a seal with the plate. The upper end of
the filter 23 is provided with a closed sheet metal end 27 which
may have a small central opening 28 for receiving the anchoring
bolt for attaching the filter when installed on an engine. Air is
removed from the interior of the filter unit 23 by connecting it to
the conduit 18 through a central opening 29 in the plate 25 and a
low pressure or vacuum is thus maintained in the interior of the
unit. The hole 28 is sufficiently small that it does not constitute
a significant bypass for the air so that there is substantially no
impairment of the vacuum maintained within the interior of the
filter.
Water is sprayed over the external surface of the filter 23 from a
plurality of spray nozzles or jets 30 carried on a yoke comprising
a cross conduit 31 and two upright conduits 32, the nozzles 30
being arranged in straight lines at spaced intervals along the
upright conduits 32 and being directed radially against the outer
surface of the filter 23. The yoke assembly is rotatable about the
axis of an upright supply connection 33 which is rotatably mounted
in a cross brace 34 attached to the partition 13 and the end wall
of the housing 10. Water is supplied from a main water inlet
connection 35 mounted on the offset wall 20 and provided with a
manual valve 36. Water for the nozzle 30 is supplied to the
connection 33 through a branch conduit 37 under control of a manual
valve 38. The nozzle assembly is rotated by the reaction forces
produced by nozzles 39 at the bottom ends of the conduits 32, these
reaction nozzles being angularly adjustable for changing the rate
of turning of the nozzle assembly. The arrangement of the nozzles
30 and 39 is shown in detail in FIGS. 5 and 6. An additional water
spray may be supplied to the interior of the filter 23 from a spray
nozzle 40 extending upwardly through the opening 29 in the plate
25. This nozzle is supplied with water from the main 35 through a
branch conduit 42 having a valve 43 for adjusting the flow of
water.
As illustrated in FIGS. 1 and 4, the filtering unit retaining
assembly in the compartment 12 comprises a rotatable circular
bottom plate 46 preferably provided with a rubberlike sealing
surface and a vertically adjustable top plate 47 having a seal for
engagement with the filter unit and which is mounted on a
telescoping duct assembly 48 attached to the top wall of the
compartment 12. Air is admitted to the duct assembly 48 from a duct
50 of triangular cross section which extends across the top of the
housing 10 and is in open communication with the top of the
compartment 11 and with the top of the duct assembly 48. The
structural details of the duct assembly 48 and rotatable plate 46
are described below in connection with the descriptions of FIGS. 9
and 10.
It will now be apparent that air is circulated through both the
filters of compartments 11 and 12 into the duct 18 and returns to
the interior of the housing through the outlet duct 19 and is thus
recirculated continuously during the operation of the
apparatus.
A water spray is directed over the inner wall of the filter 24 from
a vertical conduit 51 provided with radially positioned nozzles 52
arranged in oppositely facing straight rows on opposite sides of
the conduit 51 with the nozzles in each row staggered with respect
to the nozzles in the other. At the bottom of the conduit 51 there
is a terminal cross conduit 53 having nozzles 54 at its ends. The
conduit 53 is of generally S-shaped configuration so that the
nozzles 54 are directed at slight angles to the radial and are
effective to produce rotation of the conduit 51 so that the spray
is applied about the entire interior wall of the filter 24. The
arrangement of the nozzles 52 and 54 on the conduit 51, as shown in
enlarged detail in FIG. 7, includes a fitting 53a in which the two
arms of the conduit 53 may be adjusted independently to select the
angles of the nozzles 54 and thereby adjust the speed of rotation
of the spray. Water is supplied to the nozzles 52 through the
conduit 51 from a branch connection 55 having a manual control
valve 56 similar to the valves 38 and 43 in the branches 37 and 42.
The water connections to the several jets are indicated
diagrammatically in FIG. 2. The sprays are pressurized and for this
purpose air under pressure from a suitable supply 57 is supplied to
the several branch conduits through a connection 58 under control
of a manual valve 60. A pressure gauge 61 is provided to indicate
the pressure supplied to the system, and a check valve 62 is
provided to prevent water from flowing into the air supply line.
This arrangement of the air-pressurized sprays assures uniform
pressure of the water supplied to the sprays. Water for auxiliary
use may be supplied through a flexible hose (not shown) which may
be connected to a faucet 63 connected on the outlet side of the
supply valve 36; such flexible hose may be employed, for example,
to clean the inside walls of the apparatus after use, and it is
particularly useful for checking the cleanliness of individual
pleats of the paper filter to determine whether the cleaning
operation has been completed.
As shown in FIGS. 1 and 3, the filter 23 comprises an inner
perforated cylindrical metal wall or screen 64 and an outer
cylindrical perforated metal wall or screen 65 spaced apart and
retaining a paper filter of the accordion-pleated type indicated at
66. During the operation of the filter to clean the combustion air
for an internal combustion engine, for example, and depending upon
the connections employed, the air may be circulated either from the
outside in or from the inside out. In either case, the accumulated
solids removed from the air are collected as a residue on the
surface of the filter paper in the pleats on the intake side from
which the air is received By way of example, it can be assumed that
in FIG. 3 the filter has been employed with the air flowing from
the inside out and that the accumulation of residue is therefore on
the inner faces of the pleats of the paper 66. When the vacuum pump
17 is in operation and is circulating air through the system while
a pressurized water spray is being applied to the outer surface of
the filter by operation of the nozzles 30 and the arm 31, which is
rotated by the tangential component of the reaction force at the
nozzles 38, both water and air are passed through the filter paper
into the inside of the filter and thence out through the bottom
outlet 29. This operation is continued until the water flowing
through the filter is substantially clear. In addition to the water
sprayed over the outside of the filter 23 water may also be sprayed
from the nozzle 40 and to rinse or flush the interior surfaces of
the filter.
The filter 24 as illustrated in FIGS. 1 and 4 is of the same
construction as the filter 23 and by way of example it may be
assumed that the filter 24 has been employed in an air intake
system wherein the flow through the filter is from the inside out.
The accumulated residue of separated solids thus lies on the outer
face of the filter paper indicated at 67. During the cleaning
operation, the filter 24 is positioned, with its open end up, on
the retaining assembly and the interior of the filter 24 is washed
by sprays projected from nozzles 52; the nozzle assembly is rotated
about the axis of the spray conduit 51 which is rotatably suspended
on a quick detachable coupling (not shown in FIG. 1) so that the
tangential components of the reaction forces at the nozzles 54
produce rotation of the sprays. The closed end of the filter unit,
indicated at 68, has a center hole 70 for receiving an attaching
bolt; this hole is so small that it does not significantly affect
the flow of air through the filter paper.
During the operation of the washing sprays and rotation of the
nozzles 52 within the filter 24, air is admitted to the interior of
the filter through the telescopic inlet assembly 48 and passes with
the water through the perforated inner wall thence through the
filter and out through the perforated outer wall of the filter.
After passing through the filter, the air passes downwardly under
the mounting plate 46 and into a branch duct 71 into the suction
duct 18. This circulation of air is continuous during the filter
washing operation and may be continued after the water sprays have
been turned off in order to effect a partial drying of the
filter.
In the event that is is desired to employ only one of the
compartments 11 and 12 to wash a filter the respective air outlet
duct 26 or 71 of the other compartment is closed by a closure
cylinder illustrated in FIG. 8. This cylinder comprises an
elongated hollow cylindrical portion 72, a top plate 73 extending
over the walls of the cylinder 72 and providing a stop flange and a
handle 74 for convenience in placing the plug in position and in
removing it. The cylinder 72 is of sufficient length to fit over
the nozzle 40 in the compartment 11 and to reach through the plate
46 in the compartment 12 and into the speed opening of the duct 71.
By closing the unused duct in this manner, the full effectiveness
of the vacuum pump is available for drawing air through the filter
in the other compartment and removing all liquid.
The arrangement of the vacuum duct 18 and the rotating plates 25
and 46 is illustrated in FIG. 9. The plate 25 is rotatably mounted
on a collar 75 securely attached to the outlet duct 27 and also
supported from the walls of the cabinet by a bracket (not shown).
The plate 25 is rotatable on the supporting ring 75 on a ball
bearing assembly 76 so that it may be turned easily when placing a
filter in position in the compartment 11. The plate 46 is rotatably
mounted on the wall 14 and the outlet duct 71 on a ball bearing
assembly 77 spaced from the wall on legs 78 to provide passages for
air under the edge of the plate 46 and into the duct 71.
The air inlet duct assembly 48 which carries the plate 47 is shown
in detail in FIG. 10. The assembly 48 is mounted on the upper
stationary wall of the compartment 12 as indicated at 80. The wall
80 is provided with a circular intake opening 81 for the passage of
air into the assembly 48 from the triangular duct 50. The assembly
comprises three telescoping cylindrical duct members 82, 83 and 84
spaced from one another and being closed to the outside by inturned
flanges 85 and 86 on the members 82 and 83, respectively, which
flanges slidably engage the cylinders 83 and 84, respectively. The
cylinder 84 is securely bonded to the plate 47 about an opening 87
in the plate. It will now be apparent that the plate 47 may be
raised and lowered while maintaining a sealed duct connection
between the openings 81 and 87. A sealing gasket 88 may be secured
to the underside of the plate 47 for facilitating the sealing of a
filter unit in engagement therewith. Plate 47, as shown in FIG. 10,
is in its upward or retracted position and is held on spring hooks
90 which are mounted on downwardly extending triangular plate
brackets 91 attached to the underside of the top wall 80 of the
compartment 12. When in use the duct assembly 48 is moved
downwardly the spring catches 90 releasing the plate 47 whereupon
the assembly and is moved into position with the gasket 88 in
sealing engagement with the top of a filter resting on the bottom
plate 46. In order to facilitate the placing of a filter in
position the spray assembly 51 is made detachable as mentioned
heretofore a quick detachable coupling 92 being provided for this
purpose. This coupling is of the well-known type wherein an axially
sliding member is arranged to release ball detents (not shown) so
that a detachable element 93 at the end of the spray conduit 51 may
be placed in position and then locked by returning the slide member
to its position locking the detents and holding the detaching
element 93 and conduit 51 against axial movement while affording
rotational movement with respect to the coupling 92.
The arrangement of the bearing assemblies affording rotation of the
plates 25 and 46 is illustrated generally in FIG. 11 which is an
enlarged view of the mounting for the plate 46. As shown her, the
plate 46 has a central round opening 95 which is in alignment with
the opening at the top of the duct branch 71 indicated at 96. The
bearing assembly 77 comprises upper and lower plates 97 and 98
formed with annular bearing races in which ball bearing 90 are free
to rotate. The plug 72 of FIG. 8 is of sufficient length to pass
through the opening 95 and into the opening 96 and thereby seals
off the inlet to the duct 71. It will be noted that when the duct
71 is open air is free to pass through the spaces between the legs
78 directly from the compartment 11 into the suction conduit 18.
The construction of the bearing assembly 76 is substantially the
same with the omission of an air passage such as that provided by
the legs 78 of FIG. 11.
The method of washing or cleaning filters which I have invented,
and which can employ an apparatus such as that described above,
comprises an initial washing or rinsing of the filter by
concurrently passing water and air through the paper thereof in a
direction opposite that in which the air has passed during use of
the filter and has accumulated a residue on the filter. This
washing action is continued until the outflow or discharge from the
filter comprises substantially clear water. Thereafter, a second
step comprises the passing of water and air in a similar manner
through the filter in the reverse direction. I have found that the
foregoing procedure removes material lodged in the filter and which
has not been removed by the initial step. The change in direction
of fluid flow through the filter may be accomplished, for example,
by placing the filter first in one compartment of the apparatus of
FIG. 1 and then in the other compartment thereof.
I also prefer to employ a preparatory step in the cleaning process
wherein the filter to be cleaned is first subjected to soaking in a
quiet bath of filter-cleaning fluid which tends to loosen the
accumulation of deposited residue on the filter and to dissolve
some components thereof. The water applied to the filter in the
first and second stages is preferably applied as a spray under
substantial velocity and the initial step of preparing the filter
by soaking in a suitable filter-cleaning solution greatly
facilitates the release of the residue from the filter and shortens
the time required for cleaning the filter under the spraying and
air passage process steps. In both the washing and air passage
steps, I have found it desirable to continue the passage of air
after shutting off the water spray which effectively eliminates
excess water from the filter unit. After the excess water has been
removed the filter unit is preferably dried in a heated oven at a
relatively slow rate. For example, the filter may be held in a oven
at a controlled temperature normally not exceeding 160.degree. F.
for a period of from 1 to 4 hours.
The method of this invention has been found highly effective in
cleaning air filters for internal combustion engines and in
maintaining the paper in useful filtering condition for as many as
six or seven reuse cycles.
* * * * *