CA1072890A - Automatic air filter - Google Patents
Automatic air filterInfo
- Publication number
- CA1072890A CA1072890A CA272,023A CA272023A CA1072890A CA 1072890 A CA1072890 A CA 1072890A CA 272023 A CA272023 A CA 272023A CA 1072890 A CA1072890 A CA 1072890A
- Authority
- CA
- Canada
- Prior art keywords
- web
- air
- filter
- housing
- dirty
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/18—Particle separators, e.g. dust precipitators, using filtering belts
- B01D46/22—Particle separators, e.g. dust precipitators, using filtering belts the belts travelling during filtering
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An automatic industrial air filter in which a web of filter material is moved through a filter housing along a serpentine path so as to form, with the housing, a plurality of alternate dirty air and clean air chambers. Dirty air passes through the web into the clean air chambers and is discharged therefrom. The web exits from the housing for cleaning and/or reversal and recycling through the filter.
Static reverse air flow jets are provided in at least some of the clean air chambers to intermittently effect a counter-current air flow from the clean air chambers to the dirty air chambers, thereby dislodging dust trapped on the dirty air side of the web and causing it to be deposited in a hopper disposed below the filter for that purpose.
An automatic industrial air filter in which a web of filter material is moved through a filter housing along a serpentine path so as to form, with the housing, a plurality of alternate dirty air and clean air chambers. Dirty air passes through the web into the clean air chambers and is discharged therefrom. The web exits from the housing for cleaning and/or reversal and recycling through the filter.
Static reverse air flow jets are provided in at least some of the clean air chambers to intermittently effect a counter-current air flow from the clean air chambers to the dirty air chambers, thereby dislodging dust trapped on the dirty air side of the web and causing it to be deposited in a hopper disposed below the filter for that purpose.
Description
~7Z~390 This invention relates to automatic industrial air filters of the fahric type and includes filters employed in the cleaning of other gases.
Industrial air filters provided with a web of filter material which is advanced through the filter along a vertical or horizontal serpentine or zig-zag path are well known. A
clean web of material is fed in at one end of the filter and dirty or clogged web material is withdrawn at the other encl for cleaning and re-use. The edges of the filter material are 10 sealed against the filter housing so that air to be cleanecl can -~
only pass from the dirty air side to the clean air si~e through the filter material It is also known to provide bag type filters which may be cleaned in situ within the ilter housing, usually by .rapping or countercurrent air flow. One such device is shown in United States Patent 3,490,207 issued January 20, 1970, to C. R. Sare, in which an air nozzle is moved from bag to bag on an externally mounted traveller mechanism.
Such devices suffer from many disadvantages, cleaning is not entirely satisfactory, external mechanisms as in the Sare device are cumbersome and space consuming, and with the large numbers of moving parts expensive to maintain.
It ist therefore, an object of the present invention to provide an industrial air cleaner which provides a maxiDnum surface area of filter material in a minimum of space, whici~
is easy to clean and which has a minimum of moving parts consistent with high throughput~ Other objects of the invention wlll become apparent as the description proceeds.
I have found that the objects of the invention may be achieved by providing, in one aspect of the invention, an air filter comprising a housi~g through which a web is fed along a - ' ' ~ ' ' , , "
ra~
~72~390 serpentine path to form a plurality of loops, alternate loops in association with the housing forming clean and dirty air chambers. Air is fed into the dirty air chambers perpendicular to the direction of movement o~ the web through the housing.
The air passes through the web into the adjacent clean air chambers and thence to an outlet. The web may be cleaned after it leaves the housing or alternatively or in addition may be cleaned within the housing. The in situ cleaning is achieved by providing in at least selected ones of the clean air chambers, air blower devices which intermittently blow air through the web countercurrent to the stream of dirty air, thereby dislodging dust and causing it to fall to the bottom of the ', dirty air chambers where it is collected in a hopper and ~' discharged. -The invention will become more apparent by reference to the ollowing detailed description taken in conjunction with the drawings in which:
Fig. 1 is a front elevational view, partially broken away, of a filter according to the invention;
Fig. 2 is a plan view of the filter of Fig. 1, partiall,y broken away; and Fig. 3 is an enlarged isometric sketch o~ part of the front view shown in Fig. 1 showing the clean air exit side of the filter.
In Fig. 1 a frame 1 supports a sheet metal housi,ng 2 of the filter. Hoùsing 2 is provided with a plurality of parallel ~pper rollers 3 and a pluralit~ of lower rollers 4 each provided with a drive sprocket 5. Sprockets 5 are connected, via a drive chain 6 to a drive means, such as a motor 7. The motor 7 may be reversed in order to reverse the direction of the we~ through the filter.
ra~ - 2 - .
;. -................ ~ . .
,, - . ~
~ . . - . .
~7Z~
Frame 1 carries a feed roll 8 upon which a web of filter material 9 is wound~ Web 9 is fed through intake 10 into housing 2 and thence alternately over laterally spaced upper and lower rollers 3 and 4 in a serpentine path such that -adjacent portions, for example 11 and 12, of the web are substantially parallel. Web 9 exits from the housing via outlet 13 to a take-up reel (not shown) or cleaning device (not shown).
As seen more clearly in Figs. 2 and 3, web 9 cooperates in a substantially gas-tight manner with end plates on housing 2 to form alternate dirty air and clean air chambers. A vertically oriented rounded end plate 14 is provided at each lowe~ roller 4 and extends from top to bottom of housing 2 and a vertically -oriented squared end plate 15 is provided at each upper roller 3 extending from top to bottom of housing 2, so as to provide alternate dirty air and clean air chambers 16 and 17, respectively, across the ~ilter so that dust-laden air blown in from the dirty air inlet 18 enters the dirty air chambers 16 but is prevented from entering the clean air chambers by the rounded plates 14. The dust-laden air is prevented from exiting from the dirty air chambers by square end plates 15. The air must therefore pass through he web of filter material 9 to enter ;
clean air chambers 17. Clean air may then exit through lou~res 28 -on the front face of the filter. It will be appreciated that although only a single ~ilter has been shown herein a plurality of filter units may be used in combination, depending upon the particular enviro~mental conditions encountered and the degree - of cleaning re~uired. In a combination filter the "clean" air exiting from the first filter becomes the "dirty" air feed to ~he se~ond filter and so on.
~0 The speed at which the web 9 is drawn through the ~ilter may vary widely depending on ~he throughput o~ air and 1. .':, ra~ ~ ~
:, ; , :'' . : . - . . . .. .. . . . .. .
~72~9~
the dust loadiny thereof, and may, for example, vary between 0-5 and 20 ft/min Furthermore, the web may only be advanced intermittently if desired.
Dust collects on the dirty air chamber ~ide of the web and while some is carried through the filter to exit 13 for external cleaning of the web, a considerable portion falls off the web and falls, under gravity, into hopper 19 provided beneath the filter unit and in communication with the dirty air chambers 16.
It will be appreciated that external cleaning of the web is time consuming and laborious and it is thexefore advantageous to effect in situ cleaning as often as possible between external cleanings. For this reason, the web drive motor me.ans 7 is reversible so that the web 9 may be drawn to and fro through the filter, and means to e~fect mechanical cleaning of the web inside the filter housing 2 axe provided.
The mechanical cleaning me~ms comprise a plura].ity of a~r tubes 20 placed in selected, preferably alternate, ones of the clean air chambers 17, in a horizontal parallel relation-ship to the web 9. The air tubes 20 are connected to an airmain 21, and provided with a plurality of air blast slots or nozzles 22 on opposite sides thereof, so that air from the main 21 may be directed, intermittently, through the slots 22 against an adjacent face of web 9, thereby causing a flow of clean air through the filter material countercurrent to the dirty air flow. The countercurrent air flow dislodges dust particles on the dirty air side of the web and causes the dislodged particles ..
to fall, under gravity, into hopper 19. The cleaned web then proceeds along the ~erpentine path to exit 13 for recycling -.
3~ or reversal through the filter.
ra/
- - . . . -- . . . : . .
Industrial air filters provided with a web of filter material which is advanced through the filter along a vertical or horizontal serpentine or zig-zag path are well known. A
clean web of material is fed in at one end of the filter and dirty or clogged web material is withdrawn at the other encl for cleaning and re-use. The edges of the filter material are 10 sealed against the filter housing so that air to be cleanecl can -~
only pass from the dirty air side to the clean air si~e through the filter material It is also known to provide bag type filters which may be cleaned in situ within the ilter housing, usually by .rapping or countercurrent air flow. One such device is shown in United States Patent 3,490,207 issued January 20, 1970, to C. R. Sare, in which an air nozzle is moved from bag to bag on an externally mounted traveller mechanism.
Such devices suffer from many disadvantages, cleaning is not entirely satisfactory, external mechanisms as in the Sare device are cumbersome and space consuming, and with the large numbers of moving parts expensive to maintain.
It ist therefore, an object of the present invention to provide an industrial air cleaner which provides a maxiDnum surface area of filter material in a minimum of space, whici~
is easy to clean and which has a minimum of moving parts consistent with high throughput~ Other objects of the invention wlll become apparent as the description proceeds.
I have found that the objects of the invention may be achieved by providing, in one aspect of the invention, an air filter comprising a housi~g through which a web is fed along a - ' ' ~ ' ' , , "
ra~
~72~390 serpentine path to form a plurality of loops, alternate loops in association with the housing forming clean and dirty air chambers. Air is fed into the dirty air chambers perpendicular to the direction of movement o~ the web through the housing.
The air passes through the web into the adjacent clean air chambers and thence to an outlet. The web may be cleaned after it leaves the housing or alternatively or in addition may be cleaned within the housing. The in situ cleaning is achieved by providing in at least selected ones of the clean air chambers, air blower devices which intermittently blow air through the web countercurrent to the stream of dirty air, thereby dislodging dust and causing it to fall to the bottom of the ', dirty air chambers where it is collected in a hopper and ~' discharged. -The invention will become more apparent by reference to the ollowing detailed description taken in conjunction with the drawings in which:
Fig. 1 is a front elevational view, partially broken away, of a filter according to the invention;
Fig. 2 is a plan view of the filter of Fig. 1, partiall,y broken away; and Fig. 3 is an enlarged isometric sketch o~ part of the front view shown in Fig. 1 showing the clean air exit side of the filter.
In Fig. 1 a frame 1 supports a sheet metal housi,ng 2 of the filter. Hoùsing 2 is provided with a plurality of parallel ~pper rollers 3 and a pluralit~ of lower rollers 4 each provided with a drive sprocket 5. Sprockets 5 are connected, via a drive chain 6 to a drive means, such as a motor 7. The motor 7 may be reversed in order to reverse the direction of the we~ through the filter.
ra~ - 2 - .
;. -................ ~ . .
,, - . ~
~ . . - . .
~7Z~
Frame 1 carries a feed roll 8 upon which a web of filter material 9 is wound~ Web 9 is fed through intake 10 into housing 2 and thence alternately over laterally spaced upper and lower rollers 3 and 4 in a serpentine path such that -adjacent portions, for example 11 and 12, of the web are substantially parallel. Web 9 exits from the housing via outlet 13 to a take-up reel (not shown) or cleaning device (not shown).
As seen more clearly in Figs. 2 and 3, web 9 cooperates in a substantially gas-tight manner with end plates on housing 2 to form alternate dirty air and clean air chambers. A vertically oriented rounded end plate 14 is provided at each lowe~ roller 4 and extends from top to bottom of housing 2 and a vertically -oriented squared end plate 15 is provided at each upper roller 3 extending from top to bottom of housing 2, so as to provide alternate dirty air and clean air chambers 16 and 17, respectively, across the ~ilter so that dust-laden air blown in from the dirty air inlet 18 enters the dirty air chambers 16 but is prevented from entering the clean air chambers by the rounded plates 14. The dust-laden air is prevented from exiting from the dirty air chambers by square end plates 15. The air must therefore pass through he web of filter material 9 to enter ;
clean air chambers 17. Clean air may then exit through lou~res 28 -on the front face of the filter. It will be appreciated that although only a single ~ilter has been shown herein a plurality of filter units may be used in combination, depending upon the particular enviro~mental conditions encountered and the degree - of cleaning re~uired. In a combination filter the "clean" air exiting from the first filter becomes the "dirty" air feed to ~he se~ond filter and so on.
~0 The speed at which the web 9 is drawn through the ~ilter may vary widely depending on ~he throughput o~ air and 1. .':, ra~ ~ ~
:, ; , :'' . : . - . . . .. .. . . . .. .
~72~9~
the dust loadiny thereof, and may, for example, vary between 0-5 and 20 ft/min Furthermore, the web may only be advanced intermittently if desired.
Dust collects on the dirty air chamber ~ide of the web and while some is carried through the filter to exit 13 for external cleaning of the web, a considerable portion falls off the web and falls, under gravity, into hopper 19 provided beneath the filter unit and in communication with the dirty air chambers 16.
It will be appreciated that external cleaning of the web is time consuming and laborious and it is thexefore advantageous to effect in situ cleaning as often as possible between external cleanings. For this reason, the web drive motor me.ans 7 is reversible so that the web 9 may be drawn to and fro through the filter, and means to e~fect mechanical cleaning of the web inside the filter housing 2 axe provided.
The mechanical cleaning me~ms comprise a plura].ity of a~r tubes 20 placed in selected, preferably alternate, ones of the clean air chambers 17, in a horizontal parallel relation-ship to the web 9. The air tubes 20 are connected to an airmain 21, and provided with a plurality of air blast slots or nozzles 22 on opposite sides thereof, so that air from the main 21 may be directed, intermittently, through the slots 22 against an adjacent face of web 9, thereby causing a flow of clean air through the filter material countercurrent to the dirty air flow. The countercurrent air flow dislodges dust particles on the dirty air side of the web and causes the dislodged particles ..
to fall, under gravity, into hopper 19. The cleaned web then proceeds along the ~erpentine path to exit 13 for recycling -.
3~ or reversal through the filter.
ra/
- - . . . -- . . . : . .
Claims (4)
1. An automatic advancing web filter for cleaning air comprising: a housing, a web of filter material adapted to be advanced through said housing along a serpentine path such that said web forms a plurality of substantially parallel elongated loops, said housing and adjacent loops defining alternate clean air chambers and dirty air chambers; air inlet means and opposed air outlet means in said housing defining an air flow path therebetween substantially perpendicular to the path of said web; said inlet means and outlet means communicating with said dirty air and clean air chambers, respectively, such that dust laden air passing along said air flow path, passes through said web from said dirty air chambers to said clean air chambers, depositing said dust in said dirty air chamber and on one side of said filter web material; drive means for advancing said web along said web path; blowing means in at least selected ones of said clean air chambers adapted to blow air intermittently through said web countercurrent to said dusty air flowing along said air path thereby dislodging dust deposited on said one side of said web; and means to collect and discharge said dust from said dirty air chambers.
2. An automatic air filter as defined in claim 1 wherein said web is advanced continuously through said housing.
3. An automatic air filter as defined in claim 1 wherein said web is advanced intermittently through said housing.
4. An automatic air filter as claimed in claims 1, 2 or 3, wherein said drive means comprise a plurality of rollers each operatively connected to a motor means; said web passing over each successive roller thereby forming said serpentine path and maintaining said web substantially taut between each driven roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA272,023A CA1072890A (en) | 1977-02-17 | 1977-02-17 | Automatic air filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA272,023A CA1072890A (en) | 1977-02-17 | 1977-02-17 | Automatic air filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1072890A true CA1072890A (en) | 1980-03-04 |
Family
ID=4107957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA272,023A Expired CA1072890A (en) | 1977-02-17 | 1977-02-17 | Automatic air filter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1072890A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0080616A1 (en) * | 1981-11-09 | 1983-06-08 | James Long | Gas borne particle filtering method |
| EP0413946A1 (en) * | 1989-08-24 | 1991-02-27 | Zinser Textilmaschinen GmbH | Method and device for cleaning of workstations in a spinning machine |
-
1977
- 1977-02-17 CA CA272,023A patent/CA1072890A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0080616A1 (en) * | 1981-11-09 | 1983-06-08 | James Long | Gas borne particle filtering method |
| EP0413946A1 (en) * | 1989-08-24 | 1991-02-27 | Zinser Textilmaschinen GmbH | Method and device for cleaning of workstations in a spinning machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |