CA2154207A1 - Dust collector with reverse air cleaning - Google Patents
Dust collector with reverse air cleaningInfo
- Publication number
- CA2154207A1 CA2154207A1 CA002154207A CA2154207A CA2154207A1 CA 2154207 A1 CA2154207 A1 CA 2154207A1 CA 002154207 A CA002154207 A CA 002154207A CA 2154207 A CA2154207 A CA 2154207A CA 2154207 A1 CA2154207 A1 CA 2154207A1
- Authority
- CA
- Canada
- Prior art keywords
- air
- grid plate
- predetermined
- dust collector
- filter cartridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
An industrial dust collector which combines pleated filter cartridges of a resilient material such as thermoformable spun-bonded polyester media, and a continuous flow of cleaning air that is periodically passed through such filter media in a reverse direction to the normal air flow to expand the filter media and dislodge foreign matter collected in the pleats of the filter media.
Description
~15~2~7 .
DUST COLLECTOR WITH REVERSE AIR CLEANING
Back4lo~n~ of the Invention The present invention relates generally to dust collectors for use as industrial air filters and the like and, more particularly, to dust collectors of the type which include an arrangement for self-cleaning the filter elements mounted in the dust collector.
In general, self-cleaning industrial dust collectors have traditionally fallen into two separate and distinct categories, namely, so-called reverse air dust collectors and so-called pulse jet dust collectors.
Typical examples of the reverse air dust collectors are disclosed in Wheaton U.S. Patent No. 4,157,899; Bourne U.S. Patent No. 3,648,442; Barr U.S. Patent No. 3,951,627; and Goodrich U.S.
Patent No. 4,878,926. In all of these dust collectors, the filters are in the form of a long bag made of a fabric material, and these filter bags are self-cleaned at periodic intervals by a continuous flow of cleaning air directed into the interior of the bags which flow outwardly through the interstices of the fabric material in a direction opposite to the normal flow of air to be cleaned, whereby particles of foreign matter which have collected on the exterior surface of the filter bag are removed therefrom. Because of the nature of the fabric from which bag filters are made, namely, the flaccid material with the relatively large interstices in the fabric, they are most effectively and efficiently cleaned by the continuous flo~ of cleaning air, although it has been proposed to let the pressure of the cleaning air build up and be released in bursts of air as disclosed, for example, in Bosworth U.S. Patent No. 4,655,799.
21,j'~207 With the advent of pleated paper filters, it was found that such filters could be used in many applications of industrial dust collectors, and the use of the smaller size of the pleated paper filter elements reduced significantly the size of the dust collector and increased the cleaning efficiency of the filter.
These pleated paper filters are formed of a somewhat porous and generally stiff paper that is fluted with V-shaped indentations.
Because of the inherent stiffness of the paper filter medium, these filters could not be properly self-cleaned using a reverse flow of cleaning air as described above and, instead, required the use of so-called pulse jets, which consist of a nozzle positioned above the interior opening of each pleated paper filter cartridge to produce a quick, high pressure pulse of air within the "interior" of the filter cartridge that caused the pleated side walls of the paper filter medium to bow outwardly and release some of the foreign particles on the outer surface of the filter cartridge. A typical pulse jet cleaning system of this general type is described in Frey U.S. Patent No. 4,218,227. While these pulse jets are effective in cleaning pleated paper filter cartridges, the equipment and operating costs necessary to generate the pulse jets add a significant expense to the manufacture and operation of dust collectors that utilize pulse jet cleaning.
Recently, pleated filter cartridges have been made from a more resilient material, such as thermoformable spun-bonded polyester as described in greater detail in U.S. patent application Serial No. 08/082,666, filed June 25, 1993, which is incorporated herein by reference. It has been found that the use of these new filter cartridges with conventional pulse jet 2I~42~`7 -cleaners of the type described above results in more effective cleaning of the filter cartridges by the pulse jets, but dust collectors utilizing these new filter cartridges still have the disadvantage of relatively high equipment and operating costs as described above.
Summary of the Invention In accordance with the present invention, it has been found that the use of pleated filter cartridges with the new more flexible filter media in combination with a continuous stream of reverse air to clean such filter elements results in a dust collector which offers the efficient and effective filtering associated with typical pulse jet cleaned pleated filter cartridges and the significant cost saving available from reverse air cleaning as compared with pulse jet cleaning.
More specifically, the present invention includes a dust collector for removing foreign particles from an air stream, such dust collector comprising a housing including a grid plate having a plurality of openings therein arranged in a predetermined pattern wherein such openings are arranged in concentric circles, and an air blower assembly which is mounted for rotation within the housing and just above the grid plate. The air blower assembly includes a plenum chamber having a radial extent along the grid plate and the plenum chamber is rotatable along the upper surface of the grid plate and has air discharge openings positioned to direct air downwardly into the aforesaid grid plate openings progressively as the plenum chamber is rotated above the grid plate. The air blower assembly also includes an air blower for generating a generally continuous and steady stream of air through the discharge openings in the plenum chamber at a 215g~07 predetermined flow rate. A pleated filter cartridge is mounted on the grid plate at each of the openings therein, and each cartridge depends downwardly from the grid plate. Each filter cartridge is provided with a plurality of pleats, with each pleat formed by an inner apex and two side walls extending outwardly from the apex at a predetermined angle, and each filter cartridge is formed of a material having a particular resiliency that will cause the material to normally be disposed in a relaxed state for general filtering operation with the filter pleat side walls disposed at the aforesaid predetermined pleat angle. However, in response to the aforesaid continuous stream of cleaning air being directed into the filter cartridge at the aforesaid predetermined flow rate, the pleats move to an expanded state at which the pleat angle increases to a second value greater than the predetermined pleat angle whereby foreign particles are removed from the outer surface of the filter cartridge.
In the preferred embodiment of the present invention, the blower assembly includes a stanchion mounted for rotation above the grid plate, with the plenum chamber being mounted on the stanchion for rotation therewith, and with an air blower and drive motor therefor also mounted on the stanchion for rotation therewith, the air blower and motor being positioned on the opposite side of the stanchion from the plenum so that the plenum chamber counterbalances at least some of the weight of the air blower and the drive motor. Also, it is preferred that each filter cartridge include a perforated support tube, with the resilient filtering material being disposed circumferentially about the support tube, and wherein the expanded pleat angle during cleaning is at least 10 greater than the relaxed 2I5420~
predetermined pleat angle, and the filter cartridge material is preferably a thermoformable, spun-bonded polyester material.
Brief Description of the Drawinqs Figure 1 is a side elevational view of a dust collector embodying the present invention;
Figure 2 is a front view of the air blower assembly illustrated in Figure 1, but rotated 90;
Figure 3 is a detailed view of the pleated filter cartridge;
Figure 4A is a diagrammatic illustration of the pleated filter cartridge in its relaxed state; and Figure 4B is a diagrammatic view similar to Figure 4A, but showing the filter media in its expanded or cleaning position.
Description of the Preferred Embodiment Looking now in greater detail at the accompanying drawings, Figure 1 illustrates a dust collector embodying the present invention which includes a housing 10 provided with a grid plate 12 extending horizontally across the housing 10 to divide it into an upper clean air chamber 14 and a lower dirty air chamber 16. The grid plate 12 is conventional, and includes a plurality of openings 18 that are arranged in concentric, circumferential patterns, only one of which is illustrated in Figure 1, and a pleated filter cartridge 20 is mounted at, and extends downwardly from, each of the openings 18.
A blower assembly 22, which is substantially identical to the blower assembly described in aforesaid U.S. Patent No.
4,878,926, which is incorporated herein by reference, includes a vertically extending stanchion 24 mounted for rotation about the vertical axis of its extending length in a bearing 26 affixed to 21~2~7 the grid plate 12 and an upper bearing 28 ca`rried in a support 30.
Adjacent the lower end of the stanchion member 24, a centrifugal blower 32 and its drive motor 34 are rigidly fixed to a plenum chamber 36 that extends radially outwardly with respect to the stanchion member 24 across the upper surface of the grid plate 12, and the plenum 36 has a plurality of nozzles or outlets 38 that are arranged to coincide with the aforesaid circumferentially arranged openings 18 in the grid plate 12 as the plenum chamber 36 is rotated across the upper surface of the grid plate 12, all in a manner described in greater detail in the aforesaid U.S.
Patent No. 4,878,926. The stanchion 24, with the blower 32, drive motor 34, and plenum 36 mounted thereon, is rotated by a motor 40 operating through a conventional speed reducer unit 42 which is connected to a drive gear 44 that meshes with a larger driven gear 44' secured directly to the stanchion member 24. The upper end of the stanchion member 24 is fixed to a conventional slip ring assembly 46 which receives electrical current from any convenient source. As the stanchion member 24 rotates, electrical current is transferred from the fixed portion of the slip ring assembly to the rotatable portion thereof, and the electrical current is carried by an electrical line (not shown) that passes down the center of the stanchion member 24 to the blower motor 34.
As explained in greater detail in the aforesaid U.S.
Patent No. 4,878,926, the reverse air cleaning system described above offers significant advantages in initial cost and operating cost, and by virtue of the arrangement of the air blower 32 and the horizontally extending plenum chamber 36, there is a significant reduction, as compared with conventional blower assemblies of this type, in the frictional losses of the air flow 21~207 from the impeller of the blower 32 through the plenum chamber 36 and outwardly from the plenum outlets 38. As will be described in greater detail below, this arrangement permits the blower assembly 22 to generate, at each of the plenum outlets 38, a constant and continuous air flow at a predetermined flow rate, preferably about 500 cfm.
As best seen in Figures 3, 4A, and 4B, each of the filter cartridges 20 includes an annular mounting plate 50, which is used to mount the filter cartridges 20 to the lower face of the grid plate 12, and a perforated support tube 52 depending downwardly from the mounting plate 50 to a circular, air impermeable end plate 54 fixed to the support tube 52. The filter cartridge 20 also includes filter media 56 having a generally cylindrical configuration that includes a multiplicity of pleats 58 extending longitudinally from one end of the filter cartridge 20 to the other. The filter media is preferably a thermoformable spun-bonded polyester filter media, which is commercially available from SF Air Filtration AG, Von ~oll Aerial 43, CH-4710 Klus-Balsthal, Switzerland, as Model No. SF-2651. Pleated filter cartridges with this type of filter media are described in greater detail in U.S. patent application Serial No. 08/082,666, filed June 25, 1993, which is incorporated herein by reference, and filter cartridges of this general type are also disclosed in U.S.
Patent No. 5,207,812.
In operation, filter cartridges 20 are secured to the grid plate 12 with the upper opening in each pleated filter cartridge 20 corresponding to each of the grid plate openings 18, and dirty air is introduced into the dirty air chamber 16 through an inlet (not shown) and the dirt air passes through the filter media 56 21~207 of each pleated filter cartridge 20 so that foreign particles entrained in the air are deposited on the exterior surface of the filter cartridges 20 and the cleaned air flows from the interior of each filter cartridge 20, up through the grid plate openings 18, and into the clean air chamber 14 where the air is discharged through an outlet opening (not shown), all in a conventional manner. The blower assembly 22 is constantly rotated by the motor 40 so that the plenum 36 moves across the upper surface of the grid plate 12 and air from the blower 32 is continuously discharged through the nozzles 38 which move across ~he above-described circumferentially arranged openings 18 in the grid plate 12. As a nozzle 38 passes over a grid plate opening 18, the continuous stream of air emitted therefrom flows downwardly into the interior of the adjacent filter cartridge 20, and this cleaning air then flows outwardly through the filter media 56 in a direction opposite to the normal air flow through the filter cartridge 20, whereby the foreign matter collected on the exterior surface of the filter media 56 is gradually cleaned therefrom.
As best seen in Figures 4A and 4B, the flow of cleaning air into the interior of the filter cartridges 20 results in the filter media 56 expanding from its relaxed state illustrated in Figure 4A to an expanded state illustrated in Figure 4B, and the foreign matter trapped in the pleats of the filter media 56 is released from the surface of the filter media 56.
More specifically, as explained in greater detail in the aforesaid U.S. patent application Serial No. 08/082,666, each of the pleats 58 is formed by two side walls 60 extending from an apex 62, and at the relaxed position of the pleats 58 illustrated in Figure 4A, the side walls extend from the apex 62 at a ~;42~7 predetermined pleat angle 64. When the cleaning air causes the filter media 56 to move to its expanded position, this pleat angle 64 increases to a second angle that is at least 10 greater than the pleat angle in the relaxed condition of the filter media 56.
It has been found that utilizing filter cartridges formed of a material that is more resilient than conventional pleated paper filter cartridges, such as the above-described thermoformable spun-bonded polyester filter media, in combination with a continuous flow of cleaning air introduced into the filter cartridges 20 at a predetermined flow rate provides a sufficient force to cause the filter media 56 to expand from its relaxed position (Figure 4A) to its expanded position (Figure 4B) to release the foreign matter collected in the pleats 58 without requiring the high energy, high cost pulses that heretofore have been required to clean conventional pleated paper filter cartridges having a paper filter media that is too rigid to permit cleaning by a continuous reverse air cleaning apparatus.
By virtue of this unique combination, the dust collector of the present invention, as compared with conventional pleated paper pulse-jet cleaned dust collectors, is less expensive to build, less expensive to maintain, and provides more trouble-free operation. More importantly, tests indicate that the combination of the cleaning system described above and the filter cartridges results in an approximately thirty percent savings in cleaning energy cost as compared with the utilization of such cleaning system with conventional filter bags as disclosed in the aforesaid U.S. Patent No. 4,878,926.
It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of 2 ~ 7 -broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention.
Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements, the present invention being limited only by the claims appended hereto and the equivalents thereof.
DUST COLLECTOR WITH REVERSE AIR CLEANING
Back4lo~n~ of the Invention The present invention relates generally to dust collectors for use as industrial air filters and the like and, more particularly, to dust collectors of the type which include an arrangement for self-cleaning the filter elements mounted in the dust collector.
In general, self-cleaning industrial dust collectors have traditionally fallen into two separate and distinct categories, namely, so-called reverse air dust collectors and so-called pulse jet dust collectors.
Typical examples of the reverse air dust collectors are disclosed in Wheaton U.S. Patent No. 4,157,899; Bourne U.S. Patent No. 3,648,442; Barr U.S. Patent No. 3,951,627; and Goodrich U.S.
Patent No. 4,878,926. In all of these dust collectors, the filters are in the form of a long bag made of a fabric material, and these filter bags are self-cleaned at periodic intervals by a continuous flow of cleaning air directed into the interior of the bags which flow outwardly through the interstices of the fabric material in a direction opposite to the normal flow of air to be cleaned, whereby particles of foreign matter which have collected on the exterior surface of the filter bag are removed therefrom. Because of the nature of the fabric from which bag filters are made, namely, the flaccid material with the relatively large interstices in the fabric, they are most effectively and efficiently cleaned by the continuous flo~ of cleaning air, although it has been proposed to let the pressure of the cleaning air build up and be released in bursts of air as disclosed, for example, in Bosworth U.S. Patent No. 4,655,799.
21,j'~207 With the advent of pleated paper filters, it was found that such filters could be used in many applications of industrial dust collectors, and the use of the smaller size of the pleated paper filter elements reduced significantly the size of the dust collector and increased the cleaning efficiency of the filter.
These pleated paper filters are formed of a somewhat porous and generally stiff paper that is fluted with V-shaped indentations.
Because of the inherent stiffness of the paper filter medium, these filters could not be properly self-cleaned using a reverse flow of cleaning air as described above and, instead, required the use of so-called pulse jets, which consist of a nozzle positioned above the interior opening of each pleated paper filter cartridge to produce a quick, high pressure pulse of air within the "interior" of the filter cartridge that caused the pleated side walls of the paper filter medium to bow outwardly and release some of the foreign particles on the outer surface of the filter cartridge. A typical pulse jet cleaning system of this general type is described in Frey U.S. Patent No. 4,218,227. While these pulse jets are effective in cleaning pleated paper filter cartridges, the equipment and operating costs necessary to generate the pulse jets add a significant expense to the manufacture and operation of dust collectors that utilize pulse jet cleaning.
Recently, pleated filter cartridges have been made from a more resilient material, such as thermoformable spun-bonded polyester as described in greater detail in U.S. patent application Serial No. 08/082,666, filed June 25, 1993, which is incorporated herein by reference. It has been found that the use of these new filter cartridges with conventional pulse jet 2I~42~`7 -cleaners of the type described above results in more effective cleaning of the filter cartridges by the pulse jets, but dust collectors utilizing these new filter cartridges still have the disadvantage of relatively high equipment and operating costs as described above.
Summary of the Invention In accordance with the present invention, it has been found that the use of pleated filter cartridges with the new more flexible filter media in combination with a continuous stream of reverse air to clean such filter elements results in a dust collector which offers the efficient and effective filtering associated with typical pulse jet cleaned pleated filter cartridges and the significant cost saving available from reverse air cleaning as compared with pulse jet cleaning.
More specifically, the present invention includes a dust collector for removing foreign particles from an air stream, such dust collector comprising a housing including a grid plate having a plurality of openings therein arranged in a predetermined pattern wherein such openings are arranged in concentric circles, and an air blower assembly which is mounted for rotation within the housing and just above the grid plate. The air blower assembly includes a plenum chamber having a radial extent along the grid plate and the plenum chamber is rotatable along the upper surface of the grid plate and has air discharge openings positioned to direct air downwardly into the aforesaid grid plate openings progressively as the plenum chamber is rotated above the grid plate. The air blower assembly also includes an air blower for generating a generally continuous and steady stream of air through the discharge openings in the plenum chamber at a 215g~07 predetermined flow rate. A pleated filter cartridge is mounted on the grid plate at each of the openings therein, and each cartridge depends downwardly from the grid plate. Each filter cartridge is provided with a plurality of pleats, with each pleat formed by an inner apex and two side walls extending outwardly from the apex at a predetermined angle, and each filter cartridge is formed of a material having a particular resiliency that will cause the material to normally be disposed in a relaxed state for general filtering operation with the filter pleat side walls disposed at the aforesaid predetermined pleat angle. However, in response to the aforesaid continuous stream of cleaning air being directed into the filter cartridge at the aforesaid predetermined flow rate, the pleats move to an expanded state at which the pleat angle increases to a second value greater than the predetermined pleat angle whereby foreign particles are removed from the outer surface of the filter cartridge.
In the preferred embodiment of the present invention, the blower assembly includes a stanchion mounted for rotation above the grid plate, with the plenum chamber being mounted on the stanchion for rotation therewith, and with an air blower and drive motor therefor also mounted on the stanchion for rotation therewith, the air blower and motor being positioned on the opposite side of the stanchion from the plenum so that the plenum chamber counterbalances at least some of the weight of the air blower and the drive motor. Also, it is preferred that each filter cartridge include a perforated support tube, with the resilient filtering material being disposed circumferentially about the support tube, and wherein the expanded pleat angle during cleaning is at least 10 greater than the relaxed 2I5420~
predetermined pleat angle, and the filter cartridge material is preferably a thermoformable, spun-bonded polyester material.
Brief Description of the Drawinqs Figure 1 is a side elevational view of a dust collector embodying the present invention;
Figure 2 is a front view of the air blower assembly illustrated in Figure 1, but rotated 90;
Figure 3 is a detailed view of the pleated filter cartridge;
Figure 4A is a diagrammatic illustration of the pleated filter cartridge in its relaxed state; and Figure 4B is a diagrammatic view similar to Figure 4A, but showing the filter media in its expanded or cleaning position.
Description of the Preferred Embodiment Looking now in greater detail at the accompanying drawings, Figure 1 illustrates a dust collector embodying the present invention which includes a housing 10 provided with a grid plate 12 extending horizontally across the housing 10 to divide it into an upper clean air chamber 14 and a lower dirty air chamber 16. The grid plate 12 is conventional, and includes a plurality of openings 18 that are arranged in concentric, circumferential patterns, only one of which is illustrated in Figure 1, and a pleated filter cartridge 20 is mounted at, and extends downwardly from, each of the openings 18.
A blower assembly 22, which is substantially identical to the blower assembly described in aforesaid U.S. Patent No.
4,878,926, which is incorporated herein by reference, includes a vertically extending stanchion 24 mounted for rotation about the vertical axis of its extending length in a bearing 26 affixed to 21~2~7 the grid plate 12 and an upper bearing 28 ca`rried in a support 30.
Adjacent the lower end of the stanchion member 24, a centrifugal blower 32 and its drive motor 34 are rigidly fixed to a plenum chamber 36 that extends radially outwardly with respect to the stanchion member 24 across the upper surface of the grid plate 12, and the plenum 36 has a plurality of nozzles or outlets 38 that are arranged to coincide with the aforesaid circumferentially arranged openings 18 in the grid plate 12 as the plenum chamber 36 is rotated across the upper surface of the grid plate 12, all in a manner described in greater detail in the aforesaid U.S.
Patent No. 4,878,926. The stanchion 24, with the blower 32, drive motor 34, and plenum 36 mounted thereon, is rotated by a motor 40 operating through a conventional speed reducer unit 42 which is connected to a drive gear 44 that meshes with a larger driven gear 44' secured directly to the stanchion member 24. The upper end of the stanchion member 24 is fixed to a conventional slip ring assembly 46 which receives electrical current from any convenient source. As the stanchion member 24 rotates, electrical current is transferred from the fixed portion of the slip ring assembly to the rotatable portion thereof, and the electrical current is carried by an electrical line (not shown) that passes down the center of the stanchion member 24 to the blower motor 34.
As explained in greater detail in the aforesaid U.S.
Patent No. 4,878,926, the reverse air cleaning system described above offers significant advantages in initial cost and operating cost, and by virtue of the arrangement of the air blower 32 and the horizontally extending plenum chamber 36, there is a significant reduction, as compared with conventional blower assemblies of this type, in the frictional losses of the air flow 21~207 from the impeller of the blower 32 through the plenum chamber 36 and outwardly from the plenum outlets 38. As will be described in greater detail below, this arrangement permits the blower assembly 22 to generate, at each of the plenum outlets 38, a constant and continuous air flow at a predetermined flow rate, preferably about 500 cfm.
As best seen in Figures 3, 4A, and 4B, each of the filter cartridges 20 includes an annular mounting plate 50, which is used to mount the filter cartridges 20 to the lower face of the grid plate 12, and a perforated support tube 52 depending downwardly from the mounting plate 50 to a circular, air impermeable end plate 54 fixed to the support tube 52. The filter cartridge 20 also includes filter media 56 having a generally cylindrical configuration that includes a multiplicity of pleats 58 extending longitudinally from one end of the filter cartridge 20 to the other. The filter media is preferably a thermoformable spun-bonded polyester filter media, which is commercially available from SF Air Filtration AG, Von ~oll Aerial 43, CH-4710 Klus-Balsthal, Switzerland, as Model No. SF-2651. Pleated filter cartridges with this type of filter media are described in greater detail in U.S. patent application Serial No. 08/082,666, filed June 25, 1993, which is incorporated herein by reference, and filter cartridges of this general type are also disclosed in U.S.
Patent No. 5,207,812.
In operation, filter cartridges 20 are secured to the grid plate 12 with the upper opening in each pleated filter cartridge 20 corresponding to each of the grid plate openings 18, and dirty air is introduced into the dirty air chamber 16 through an inlet (not shown) and the dirt air passes through the filter media 56 21~207 of each pleated filter cartridge 20 so that foreign particles entrained in the air are deposited on the exterior surface of the filter cartridges 20 and the cleaned air flows from the interior of each filter cartridge 20, up through the grid plate openings 18, and into the clean air chamber 14 where the air is discharged through an outlet opening (not shown), all in a conventional manner. The blower assembly 22 is constantly rotated by the motor 40 so that the plenum 36 moves across the upper surface of the grid plate 12 and air from the blower 32 is continuously discharged through the nozzles 38 which move across ~he above-described circumferentially arranged openings 18 in the grid plate 12. As a nozzle 38 passes over a grid plate opening 18, the continuous stream of air emitted therefrom flows downwardly into the interior of the adjacent filter cartridge 20, and this cleaning air then flows outwardly through the filter media 56 in a direction opposite to the normal air flow through the filter cartridge 20, whereby the foreign matter collected on the exterior surface of the filter media 56 is gradually cleaned therefrom.
As best seen in Figures 4A and 4B, the flow of cleaning air into the interior of the filter cartridges 20 results in the filter media 56 expanding from its relaxed state illustrated in Figure 4A to an expanded state illustrated in Figure 4B, and the foreign matter trapped in the pleats of the filter media 56 is released from the surface of the filter media 56.
More specifically, as explained in greater detail in the aforesaid U.S. patent application Serial No. 08/082,666, each of the pleats 58 is formed by two side walls 60 extending from an apex 62, and at the relaxed position of the pleats 58 illustrated in Figure 4A, the side walls extend from the apex 62 at a ~;42~7 predetermined pleat angle 64. When the cleaning air causes the filter media 56 to move to its expanded position, this pleat angle 64 increases to a second angle that is at least 10 greater than the pleat angle in the relaxed condition of the filter media 56.
It has been found that utilizing filter cartridges formed of a material that is more resilient than conventional pleated paper filter cartridges, such as the above-described thermoformable spun-bonded polyester filter media, in combination with a continuous flow of cleaning air introduced into the filter cartridges 20 at a predetermined flow rate provides a sufficient force to cause the filter media 56 to expand from its relaxed position (Figure 4A) to its expanded position (Figure 4B) to release the foreign matter collected in the pleats 58 without requiring the high energy, high cost pulses that heretofore have been required to clean conventional pleated paper filter cartridges having a paper filter media that is too rigid to permit cleaning by a continuous reverse air cleaning apparatus.
By virtue of this unique combination, the dust collector of the present invention, as compared with conventional pleated paper pulse-jet cleaned dust collectors, is less expensive to build, less expensive to maintain, and provides more trouble-free operation. More importantly, tests indicate that the combination of the cleaning system described above and the filter cartridges results in an approximately thirty percent savings in cleaning energy cost as compared with the utilization of such cleaning system with conventional filter bags as disclosed in the aforesaid U.S. Patent No. 4,878,926.
It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of 2 ~ 7 -broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention.
Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements, the present invention being limited only by the claims appended hereto and the equivalents thereof.
Claims (4)
1. A dust collector for removing foreign particles from an air stream, such dust collector comprising:
(a) a housing including a grid plate having a plurality of openings therein arranged in a predetermined pattern wherein said openings are arranged in concentric circles;
(b) an air blower assembly mounted for rotation within said housing above said grid plate and including a plenum chamber having a radial extent along said grid plate, said plenum chamber being movable along the upper surface of said grid plate and having air discharge openings positioned to direct air downwardly into each said grid plate openings progressively as said plenum chamber is rotated above said grid plate, and including an air blower for generating a generally continuous and steady stream of air through said air discharge openings at a predetermined rate of flow; and (c) a pleated filter cartridge mounted on said grid plate at each said opening therein and depending downwardly therefrom, each said filter cartridge being provided with a plurality of pleats each formed by an inner apex and two side walls extending outwardly from said apex at a predetermined angle, and each said filter cartridge being formed of a material having a predetermined resiliency that will cause said material to normally be disposed in a relaxed state for general filtering operation with said filter pleat side walls disposed at said predetermined pleat angle and, in response to continuous stream of air being directed into said filter cartridge at said predetermined flow rate by said air blower assembly, to move to an expanded state for removal of said foreign particles at which said pleat angle increases to a second value greater than said predetermined pleat angle.
(a) a housing including a grid plate having a plurality of openings therein arranged in a predetermined pattern wherein said openings are arranged in concentric circles;
(b) an air blower assembly mounted for rotation within said housing above said grid plate and including a plenum chamber having a radial extent along said grid plate, said plenum chamber being movable along the upper surface of said grid plate and having air discharge openings positioned to direct air downwardly into each said grid plate openings progressively as said plenum chamber is rotated above said grid plate, and including an air blower for generating a generally continuous and steady stream of air through said air discharge openings at a predetermined rate of flow; and (c) a pleated filter cartridge mounted on said grid plate at each said opening therein and depending downwardly therefrom, each said filter cartridge being provided with a plurality of pleats each formed by an inner apex and two side walls extending outwardly from said apex at a predetermined angle, and each said filter cartridge being formed of a material having a predetermined resiliency that will cause said material to normally be disposed in a relaxed state for general filtering operation with said filter pleat side walls disposed at said predetermined pleat angle and, in response to continuous stream of air being directed into said filter cartridge at said predetermined flow rate by said air blower assembly, to move to an expanded state for removal of said foreign particles at which said pleat angle increases to a second value greater than said predetermined pleat angle.
2. A dust collector as defined in claim 1, wherein said blower assembly includes a stanchion mounted for rotation above said grid plate, with said plenum chamber being mounted on said stanchion for rotation therewith, and an air blower and drive motor therefor also mounted in said stanchion for rotation therewith, said air blower and drive motor being positioned on the opposite side of said stanchion from said plenum so that said plenum chamber counterbalances at least some of the weight of said blower and said drive motor.
3. A dust collector as defined in claim 1, wherein said filter cartridge includes a perforated support tube, with said resilient material being disposed circumferentially about said support tube, and wherein said second pleat angle is at least 10°
greater than said predetermined pleat angle.
greater than said predetermined pleat angle.
4. A dust collector as defined in claim 3, wherein said filter cartridge material is a thermoformable spun-bonded polyester.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US27801394A | 1994-07-20 | 1994-07-20 | |
| US08/278,013 | 1994-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2154207A1 true CA2154207A1 (en) | 1996-01-21 |
Family
ID=23063327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002154207A Abandoned CA2154207A1 (en) | 1994-07-20 | 1995-07-19 | Dust collector with reverse air cleaning |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2154207A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116315291A (en) * | 2023-05-19 | 2023-06-23 | 四川电器集团中低压智能配电有限公司 | Prefabricated cabin for energy storage battery |
-
1995
- 1995-07-19 CA CA002154207A patent/CA2154207A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116315291A (en) * | 2023-05-19 | 2023-06-23 | 四川电器集团中低压智能配电有限公司 | Prefabricated cabin for energy storage battery |
| CN116315291B (en) * | 2023-05-19 | 2023-08-01 | 四川电器集团中低压智能配电有限公司 | Prefabricated cabin for energy storage battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |