CA2149556A1 - Filtration apparatus with twin conical overhead duct - Google Patents
Filtration apparatus with twin conical overhead ductInfo
- Publication number
- CA2149556A1 CA2149556A1 CA 2149556 CA2149556A CA2149556A1 CA 2149556 A1 CA2149556 A1 CA 2149556A1 CA 2149556 CA2149556 CA 2149556 CA 2149556 A CA2149556 A CA 2149556A CA 2149556 A1 CA2149556 A1 CA 2149556A1
- Authority
- CA
- Canada
- Prior art keywords
- air
- plenum chamber
- diffuser
- cantilevered portion
- outlet
- 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
-
- 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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/06—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material with means keeping the working surfaces flat
-
- 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
- B01D46/0002—Casings; Housings; Frame constructions
-
- 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
- B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
- B01D46/0047—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for discharging the filtered gas
- B01D46/0049—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for discharging the filtered gas containing fixed gas displacement elements or cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
- B01D2273/30—Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
An air filtering apparatus includes a flexible plenum chamber of a sheet-like material which is inflated by air forced out of the outlet of a fan body. The chamber is L-shaped, having a vertical portion and a cantilevered portion. One aspect of the invention provides an air diffuser on the top of the cantilevered portion adjacent the vertical portion. Another aspect of the invention has the cantilevered portion with two tubes.
Description
21~9~5~
FILTRATION APPARATUS WITH TWIN CONICAL OVERHEAD DUCT
BACKGROUND OF THE INVENTION
Field of the Invention The invention relates to air filters, particularly portable air filtration apparatuses intended to filter dust in industrial and commercial establishments.
Description of Related Art Many types of air filtration appala~uses have been developed for use in commercial and industrial establishments such as auto body repair shops. Some such units include a horizontally extending overhead duct where the final filtering is performed and from which 15 the air is discharged d )wllwdldly. The air from the duct then picks up dust particles before being drawn into the intake of the unit. The dust is filtered out by the unit and the cycle continues.
Some such filtering apparatuses use rigid ducts which are hung from hangers conn~cte~l to 20 the ceiling. There are also portable units where the horizontal duct is permanently attached to the filtering apparatus.
Some prior art appa,dluses are inconvenient in that they must be permanently installed and therefore cannot be moved about to dirrel~lll positions as required. Some portable units are 25 relatively e~ensive and do not offer maximum recirculation of air because the reach of the horizontal duct carrying the overhead filter is relatively limited.
U.S. Patent No. 5,163,985 to Chen shows a movable industrial dust collector having a filtration bag which extends upwardly from the unit. However, the bag is required to act as 30 a filter and thus cannot function optimally to diffuse the air discharged from the unit.
21495~5 Air filtration units with bag-like ducts, some horizontal, are disclosed in my U.S. Patent No.
5,312,465 dated May 17, 1994. However, although these units are a great advance over the prior art, they have certain disadvantages. The downward flow of air may be too great in some circumstances, possibly stirring up dust. Also the bag-like duct is not fully self 5 supporting in all circumstances such as with lower air pressure.
Accordingly, it is an object of the invention to provide an improved filtering apparatus for auto body shops and the like which provides for recirculation of the air, but does not require permanently installed, horizontal overhead ducts.
It is also an object of the invention to provide an improved filtering apparatus of the type where the air from an overhead duct can be discharged dowllw~ldly at an a~leciable distance away from the fan body of the unit.
15 It is a further object of the invention to provide an improved filtering appal~lus which reduces the type of air circulation which may stir up dust, while m~ g full air flow for filtering.
It is a still further object of the invention to provide an improved air filtering apparatus with a bag-like overhead duct which is more self-supporting when inflated compared to the prior 20 art.
SUMMARY OF THE INVENTION
In accordance with these objects, one aspect of the invention provides an air filtering 25 apparatus having a flexible bag-like plenum chamber which is generally L-shaped with a vertically extending portion which extends upwardly when the apparatus is operational.
There is a cantilevered portion which extends horizontally uulwalds from the vertically extending portion when the a~pala~us is operational. The cantilevered portion has a top and a bottom and a first air diffuser on the bottom of the cantilevered portion at an end of the 214~5~
cantilevered portion which is distal the vertical portion. There is a second air diffuser on the top of the cantilevered portion adjacent the vertically extending portion.
Another aspect of the invention provides an air filtering appaldLus with a flexible, bag-like 5 plenum chamber of a sheet-like material which is inflated by air. At least a portion of the plenum chamber is an air diffuser for air exiting the apparatus. The plenum chamber is L-shaped with a vertical portion having means for connecting the appalalus to a fan. A
cantilevered portion extends horizontally therefrom in use. The cantilevered portion has two tubular portions.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
Fig. 1 is a front, top isometric view of an air filtering apparatus according toan embodiment of the invention;
Fig. 2 is a rear, side isometric view thereof with the fan body partly broken away to show interior components thereof;
Fig. 3 is a side view thereof;
Fig. 4 is a front elevation thereof; and Fig. 5 is a top plan thereof.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring first to Fig. 1-5, these show a filtering appalalus generally at 10. The apparatus ~1~9~56 includes a fan body 12 having four sides 14, 16, 18 and 20. The mid section of each side is a closed panel, such as panel 22 on side 14. Each such panel is rectangular in this embodiment and made of sheet metal although alternative materials could be used instead.
The upper portion of each side has a second panel, such as panel 24 on side 14. This panel 5 is rectangular in this embodiment and of rigid, transparent acrylic, although alternative materials could be employed. Panel 24 and the corresponding panels on the other sides form a single member 26 extending about top 28 of the fan body 12.
The lower portion of the fan body has an air intake, shown generally at 30, which is formed 10 by four air filters 32, one on each of the sides. These air filters serve as primary air filters for the air drawn in through the intake of the a~al~lus. Each of the air filters 32 is generally rectangular in shape and may be pleated. In this in~t~n~e a Type DP sold under the trade mark AIRGUARD is used. This is m~nllfactllred by Airguard Industries, Inc. of Louisville, Kentucky, U.S.A. Other filters could be substituted.
The unit has a bottom 33 which is closed in this example and includes a dust collecting tray 34 shown in Fig. 2. There is a caster 36 fitted to the apparatus adjacent each corner of the bottom.
A fan 38 is located within the fan body 12 as seen in Fig. 2. In this example, the fan is a model 812 Delhi Blower. The fan includes a squirrel-cage type impeller 40 rotatably mounted within a shroud 42. The fan is powered by an electric motor 44 mechanically coupled to the impeller by means of sheaves 48 and 50 fitted to shaft 54 of the impeller and shaft 56 of the motor and by a V-belt 52 fitted over the sheaves. Alternative types of fans and alternative means for coupling the fan to a motor could be employed in otherembodiments of the invention. The motor 44 is mounted on a pair of struts 60 and 62 within the fan body.
There is a secondary, pocket filter 64 within the fan body adjacent top 28 which is located 21~95~
adjacent the transparent panels 24 so that the condition of the filter can be viewed. This example uses a Pocket Filter Type F45 sold under the trade mark VILEDON by Freudenberg Nonwovens Inc. of BiTmingh~m, MI, U.S.A. Other filters could be substituted.
5 The fan body has an air outlet 66 which is rectangular in shape and is formed by the opening in the body above filter 64. A bag-like plenum chamber 70 has a proximal end 72 connected to the top of the fan body about the air outlet 66. Thus the air drawn in through intake 30 is forced out of the fan body through outlet 66 into the plenum chamber after being filtered by primary filters 32 and secondary filter 64. The plenum chamber has a body 73 made of 10 a closely woven textile, spinnaker cloth of polyester in this embodiment. However, alternative flexible, lightweight, sheet-like materials could be used including non-woven plastic sheeting for example.
The plenum chamber has a vertically extending, first portion 74 which extends upwardly and outwardly away from the outlet 66 as best seen in Fig. 2. Portion 74 is connected to a horizontal, cantilevered portion 76 which extends oulw~Jly from portion 74 to distal end 78 of the plenum chamber. The vertical portion of the plenum chamber is substantially rectangular in section. The cantilevered portion has a bottom 82 which is fitted with an air diffuser 84 on portion 80 adjacent the distal end 78 as seen in Fig. 3. The air diffuser in this 20 embodiment is formed by a plurality of small apertures. In this case there are thirty such apertures about 3/1~1l to l/2" in diameter and about 10" apart. However these values can be changed according to the requirements of a particular application.
The cantilevered portion has two tubular portions 85 and 87 which extend ou~waldly from 25 the vertical portion in a side-by-side arrangement. In this example the tubular portions are tapered towards the distal end 78 of the chamber and are spaced-apart by a triangular space 89. The tubular portions are connected by a connecting portion 91 at the distal end 78. This configuration of the cantilevered portion makes it lighter and structurally more rigid when inflated.
21~955~
Apparatus 10 also includes a support member in the form of a tube 92 connected to the fan body on side 14 under the cantilevered portion. This supports the plenum chamber and keeps it off the floor when the fan is off.
There is a diffuser 94 on top 81 of the plenum chamber adjacent vertical portion 74. In this example diffuser 94 is a loosely woven fabric mesh which is generally rectangular in shape.
Other foraminous panels may be substituted.
In operation, dust laden air is drawn into the unit through the four filters 32 at the bottom of the fan body which serve as plil~la-y filters. The fan forces the air upwardly out of the fan body through the secondary filter 64 which filters particles as small as three microns. The air is then forced under pressure through plenum chamber 70. The size and nature of diffusers 84 and 94 are related to the capacity of the fan such that air pressure is built up within the plenum chamber during normal operation of the air filtering apparatus 10. This air pressure is sufficient to distend plenum chamber 70 and provide the sole means for m~int~ining the shape and position of the plenum chamber as illustrated in Fig. 1 and 2.
When the fan is not operational, air pressure is lost in the plenum chamber and portion 76 would tend to drop towards the floor. However, support member 92 keeps it from falling to the floor.
The embodiment of Fig. 1-5 achieves a recirculated type of airflow as shown best in Fig. 2.
Clean air is forced out of the apparatus from diffuser 84 as shown by arrows 112 in Fig. 2 and from diffuser 94 as shown by arrows 113. The air picks up dust from the environment and is recirculated back into the apparatus as identified by arrows 114. The flow from diffuser 94 represents about 95% of the air flow from the appal~lus in this example while diffuser 84 handles only about 5 % . This ensures the desired level of air circulation while limiting the dowllw~ld flow from the cantilevered portion which could stir up dust. The proportions can be changed if desired by adjusting the sizes of the diffusers 84 and 94.
_ -- 7 It will be understood by someone skilled in the art that many of the details provided above are by way of example only and are not intended to limit the scope of the invention which is to be hl~el~leled with rer~rellce to the following claims.
FILTRATION APPARATUS WITH TWIN CONICAL OVERHEAD DUCT
BACKGROUND OF THE INVENTION
Field of the Invention The invention relates to air filters, particularly portable air filtration apparatuses intended to filter dust in industrial and commercial establishments.
Description of Related Art Many types of air filtration appala~uses have been developed for use in commercial and industrial establishments such as auto body repair shops. Some such units include a horizontally extending overhead duct where the final filtering is performed and from which 15 the air is discharged d )wllwdldly. The air from the duct then picks up dust particles before being drawn into the intake of the unit. The dust is filtered out by the unit and the cycle continues.
Some such filtering apparatuses use rigid ducts which are hung from hangers conn~cte~l to 20 the ceiling. There are also portable units where the horizontal duct is permanently attached to the filtering apparatus.
Some prior art appa,dluses are inconvenient in that they must be permanently installed and therefore cannot be moved about to dirrel~lll positions as required. Some portable units are 25 relatively e~ensive and do not offer maximum recirculation of air because the reach of the horizontal duct carrying the overhead filter is relatively limited.
U.S. Patent No. 5,163,985 to Chen shows a movable industrial dust collector having a filtration bag which extends upwardly from the unit. However, the bag is required to act as 30 a filter and thus cannot function optimally to diffuse the air discharged from the unit.
21495~5 Air filtration units with bag-like ducts, some horizontal, are disclosed in my U.S. Patent No.
5,312,465 dated May 17, 1994. However, although these units are a great advance over the prior art, they have certain disadvantages. The downward flow of air may be too great in some circumstances, possibly stirring up dust. Also the bag-like duct is not fully self 5 supporting in all circumstances such as with lower air pressure.
Accordingly, it is an object of the invention to provide an improved filtering apparatus for auto body shops and the like which provides for recirculation of the air, but does not require permanently installed, horizontal overhead ducts.
It is also an object of the invention to provide an improved filtering apparatus of the type where the air from an overhead duct can be discharged dowllw~ldly at an a~leciable distance away from the fan body of the unit.
15 It is a further object of the invention to provide an improved filtering appal~lus which reduces the type of air circulation which may stir up dust, while m~ g full air flow for filtering.
It is a still further object of the invention to provide an improved air filtering apparatus with a bag-like overhead duct which is more self-supporting when inflated compared to the prior 20 art.
SUMMARY OF THE INVENTION
In accordance with these objects, one aspect of the invention provides an air filtering 25 apparatus having a flexible bag-like plenum chamber which is generally L-shaped with a vertically extending portion which extends upwardly when the apparatus is operational.
There is a cantilevered portion which extends horizontally uulwalds from the vertically extending portion when the a~pala~us is operational. The cantilevered portion has a top and a bottom and a first air diffuser on the bottom of the cantilevered portion at an end of the 214~5~
cantilevered portion which is distal the vertical portion. There is a second air diffuser on the top of the cantilevered portion adjacent the vertically extending portion.
Another aspect of the invention provides an air filtering appaldLus with a flexible, bag-like 5 plenum chamber of a sheet-like material which is inflated by air. At least a portion of the plenum chamber is an air diffuser for air exiting the apparatus. The plenum chamber is L-shaped with a vertical portion having means for connecting the appalalus to a fan. A
cantilevered portion extends horizontally therefrom in use. The cantilevered portion has two tubular portions.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
Fig. 1 is a front, top isometric view of an air filtering apparatus according toan embodiment of the invention;
Fig. 2 is a rear, side isometric view thereof with the fan body partly broken away to show interior components thereof;
Fig. 3 is a side view thereof;
Fig. 4 is a front elevation thereof; and Fig. 5 is a top plan thereof.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring first to Fig. 1-5, these show a filtering appalalus generally at 10. The apparatus ~1~9~56 includes a fan body 12 having four sides 14, 16, 18 and 20. The mid section of each side is a closed panel, such as panel 22 on side 14. Each such panel is rectangular in this embodiment and made of sheet metal although alternative materials could be used instead.
The upper portion of each side has a second panel, such as panel 24 on side 14. This panel 5 is rectangular in this embodiment and of rigid, transparent acrylic, although alternative materials could be employed. Panel 24 and the corresponding panels on the other sides form a single member 26 extending about top 28 of the fan body 12.
The lower portion of the fan body has an air intake, shown generally at 30, which is formed 10 by four air filters 32, one on each of the sides. These air filters serve as primary air filters for the air drawn in through the intake of the a~al~lus. Each of the air filters 32 is generally rectangular in shape and may be pleated. In this in~t~n~e a Type DP sold under the trade mark AIRGUARD is used. This is m~nllfactllred by Airguard Industries, Inc. of Louisville, Kentucky, U.S.A. Other filters could be substituted.
The unit has a bottom 33 which is closed in this example and includes a dust collecting tray 34 shown in Fig. 2. There is a caster 36 fitted to the apparatus adjacent each corner of the bottom.
A fan 38 is located within the fan body 12 as seen in Fig. 2. In this example, the fan is a model 812 Delhi Blower. The fan includes a squirrel-cage type impeller 40 rotatably mounted within a shroud 42. The fan is powered by an electric motor 44 mechanically coupled to the impeller by means of sheaves 48 and 50 fitted to shaft 54 of the impeller and shaft 56 of the motor and by a V-belt 52 fitted over the sheaves. Alternative types of fans and alternative means for coupling the fan to a motor could be employed in otherembodiments of the invention. The motor 44 is mounted on a pair of struts 60 and 62 within the fan body.
There is a secondary, pocket filter 64 within the fan body adjacent top 28 which is located 21~95~
adjacent the transparent panels 24 so that the condition of the filter can be viewed. This example uses a Pocket Filter Type F45 sold under the trade mark VILEDON by Freudenberg Nonwovens Inc. of BiTmingh~m, MI, U.S.A. Other filters could be substituted.
5 The fan body has an air outlet 66 which is rectangular in shape and is formed by the opening in the body above filter 64. A bag-like plenum chamber 70 has a proximal end 72 connected to the top of the fan body about the air outlet 66. Thus the air drawn in through intake 30 is forced out of the fan body through outlet 66 into the plenum chamber after being filtered by primary filters 32 and secondary filter 64. The plenum chamber has a body 73 made of 10 a closely woven textile, spinnaker cloth of polyester in this embodiment. However, alternative flexible, lightweight, sheet-like materials could be used including non-woven plastic sheeting for example.
The plenum chamber has a vertically extending, first portion 74 which extends upwardly and outwardly away from the outlet 66 as best seen in Fig. 2. Portion 74 is connected to a horizontal, cantilevered portion 76 which extends oulw~Jly from portion 74 to distal end 78 of the plenum chamber. The vertical portion of the plenum chamber is substantially rectangular in section. The cantilevered portion has a bottom 82 which is fitted with an air diffuser 84 on portion 80 adjacent the distal end 78 as seen in Fig. 3. The air diffuser in this 20 embodiment is formed by a plurality of small apertures. In this case there are thirty such apertures about 3/1~1l to l/2" in diameter and about 10" apart. However these values can be changed according to the requirements of a particular application.
The cantilevered portion has two tubular portions 85 and 87 which extend ou~waldly from 25 the vertical portion in a side-by-side arrangement. In this example the tubular portions are tapered towards the distal end 78 of the chamber and are spaced-apart by a triangular space 89. The tubular portions are connected by a connecting portion 91 at the distal end 78. This configuration of the cantilevered portion makes it lighter and structurally more rigid when inflated.
21~955~
Apparatus 10 also includes a support member in the form of a tube 92 connected to the fan body on side 14 under the cantilevered portion. This supports the plenum chamber and keeps it off the floor when the fan is off.
There is a diffuser 94 on top 81 of the plenum chamber adjacent vertical portion 74. In this example diffuser 94 is a loosely woven fabric mesh which is generally rectangular in shape.
Other foraminous panels may be substituted.
In operation, dust laden air is drawn into the unit through the four filters 32 at the bottom of the fan body which serve as plil~la-y filters. The fan forces the air upwardly out of the fan body through the secondary filter 64 which filters particles as small as three microns. The air is then forced under pressure through plenum chamber 70. The size and nature of diffusers 84 and 94 are related to the capacity of the fan such that air pressure is built up within the plenum chamber during normal operation of the air filtering apparatus 10. This air pressure is sufficient to distend plenum chamber 70 and provide the sole means for m~int~ining the shape and position of the plenum chamber as illustrated in Fig. 1 and 2.
When the fan is not operational, air pressure is lost in the plenum chamber and portion 76 would tend to drop towards the floor. However, support member 92 keeps it from falling to the floor.
The embodiment of Fig. 1-5 achieves a recirculated type of airflow as shown best in Fig. 2.
Clean air is forced out of the apparatus from diffuser 84 as shown by arrows 112 in Fig. 2 and from diffuser 94 as shown by arrows 113. The air picks up dust from the environment and is recirculated back into the apparatus as identified by arrows 114. The flow from diffuser 94 represents about 95% of the air flow from the appal~lus in this example while diffuser 84 handles only about 5 % . This ensures the desired level of air circulation while limiting the dowllw~ld flow from the cantilevered portion which could stir up dust. The proportions can be changed if desired by adjusting the sizes of the diffusers 84 and 94.
_ -- 7 It will be understood by someone skilled in the art that many of the details provided above are by way of example only and are not intended to limit the scope of the invention which is to be hl~el~leled with rer~rellce to the following claims.
Claims (22)
1. An air filter apparatus, comprising:
a fan body having a top, a bottom, an air intake, a fan within the body, an air outlet and an air filter between the inlet and the outlet; and a flexible, bag-like plenum chamber having a proximal end connected to the fan body about the outlet, the chamber having a vertically extending portion extending upwardly away from the outlet when the apparatus is operational, a cantilevered portion extending horizontally outwards from the vertically extending portion when the apparatus is operational, the cantilevered portion having a top and a bottom, a first air diffuser on the bottom of the cantilevered portion at an end of the cantilevered portion which is distal the fan body, and a second air diffuser on the top of the cantilevered portion.
a fan body having a top, a bottom, an air intake, a fan within the body, an air outlet and an air filter between the inlet and the outlet; and a flexible, bag-like plenum chamber having a proximal end connected to the fan body about the outlet, the chamber having a vertically extending portion extending upwardly away from the outlet when the apparatus is operational, a cantilevered portion extending horizontally outwards from the vertically extending portion when the apparatus is operational, the cantilevered portion having a top and a bottom, a first air diffuser on the bottom of the cantilevered portion at an end of the cantilevered portion which is distal the fan body, and a second air diffuser on the top of the cantilevered portion.
2. An apparatus as claimed in claim 1 wherein the plenum chamber, apart from the second diffuser, is of a tightly woven textile.
3. An apparatus as claimed in claim 1, wherein the plenum chamber is supported by air pressure therewithin when the apparatus is operational.
4. An apparatus as claimed in claim 1, wherein the first air diffuser comprises apertures in the plenum chamber.
5. An apparatus as claimed in claim 2, wherein the second diffuser is a screen.
6. An apparatus as claimed in claim 1, wherein the second air diffuser is adjacent the vertically extending portion.
7. An air filtering apparatus, comprising:
a fan body having a top, a bottom, an air intake, an air outlet, a fan within the body for drawing air into the intake and forcing it out of the outlet, and at least one air filter between the intake and the outlet; and a flexible, bag-like plenum chamber of a sheet-like material which is inflated by air forced out of the outlet of the fan body, at least a portion of the plenum chamber being an air diffuser for air exiting the apparatus, the plenum chamber being L-shaped with a vertical portion connected to the fan body about the air outlet and a cantilevered portion extending horizontally therefrom, the cantilevered portion comprising two tubular portions.
a fan body having a top, a bottom, an air intake, an air outlet, a fan within the body for drawing air into the intake and forcing it out of the outlet, and at least one air filter between the intake and the outlet; and a flexible, bag-like plenum chamber of a sheet-like material which is inflated by air forced out of the outlet of the fan body, at least a portion of the plenum chamber being an air diffuser for air exiting the apparatus, the plenum chamber being L-shaped with a vertical portion connected to the fan body about the air outlet and a cantilevered portion extending horizontally therefrom, the cantilevered portion comprising two tubular portions.
8. An air filtering apparatus as claimed in claim 7, wherein the tubular portions are spaced-apart.
9. An air filtering apparatus as claimed in claim 7, when the tubular portions are tapered towards ends thereof distal the vertical portion.
10. An air filtering apparatus as claimed in claim 9, wherein the tubular portions are spaced-apart adjacent said ends thereof and are connected together by a connecting portion of the chamber at said ends.
11. An air filter apparatus comprising:
a flexible, bag-like plenum chamber which is generally L-shaped with a vertically extending portion extending upwardly when the apparatus is operational and a cantilevered portion extending horizontally outwards from the vertically extending portion when the apparatus is operational, the cantilevered portion having a top and a bottom, a first air diffuser on the bottom of the cantilevered portion, and a second air diffuser on the top of the cantilevered portion.
a flexible, bag-like plenum chamber which is generally L-shaped with a vertically extending portion extending upwardly when the apparatus is operational and a cantilevered portion extending horizontally outwards from the vertically extending portion when the apparatus is operational, the cantilevered portion having a top and a bottom, a first air diffuser on the bottom of the cantilevered portion, and a second air diffuser on the top of the cantilevered portion.
12. An apparatus as claimed in claim 11, wherein the plenum chamber, apart from the second diffuser, is of a tightly woven textile.
13. A apparatus as claimed in claim 11, wherein the plenum chamber is supported by air pressure therewithin when the apparatus is operational.
14. An apparatus as claimed in claim 11, wherein the first air diffuser comprises apertures in the plenum chamber.
15. An apparatus as claimed in claim 11, wherein the first air diffuser is at an end of the cantilevered portion which is distal the vertical portion.
16. An apparatus as claimed in claim 12, wherein the second diffuser is a screen.
17. An apparatus as claimed in claim 11, wherein the second air diffuser is adjacent the vertically extending portion.
18. An air filtering apparatus, comprising:
a flexible, bag-like plenum chamber of a sheet-like material which is inflated by air, at least a portion of the plenum chamber being an air diffuser for air exiting the apparatus, the plenum chamber being L-shaped with a vertical portion having means for connecting the apparatus to a fan and a cantilevered portion extending horizontally therefrom in use, the cantilevered portion comprising two tubular portions.
a flexible, bag-like plenum chamber of a sheet-like material which is inflated by air, at least a portion of the plenum chamber being an air diffuser for air exiting the apparatus, the plenum chamber being L-shaped with a vertical portion having means for connecting the apparatus to a fan and a cantilevered portion extending horizontally therefrom in use, the cantilevered portion comprising two tubular portions.
19. An air filtering apparatus as claimed in claim 18, wherein the tubular portions are side-by-side.
20. An air filtering apparatus as claimed in claim 19, wherein the tubular portions are spaced-apart.
21. An air filtering apparatus as claimed in claim 18, when the tubular portions are tapered towards ends thereof distal the vertical portion.
22. An air filtering apparatus as claimed in claim 21, wherein the tubular portions are spaced-apart adjacent said ends thereof and are connected together by a connecting portion of the chamber at said ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2149556 CA2149556A1 (en) | 1995-05-17 | 1995-05-17 | Filtration apparatus with twin conical overhead duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2149556 CA2149556A1 (en) | 1995-05-17 | 1995-05-17 | Filtration apparatus with twin conical overhead duct |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2149556A1 true CA2149556A1 (en) | 1996-11-18 |
Family
ID=4155856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2149556 Abandoned CA2149556A1 (en) | 1995-05-17 | 1995-05-17 | Filtration apparatus with twin conical overhead duct |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2149556A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013091024A1 (en) * | 2011-12-23 | 2013-06-27 | Advantec Australasia Pty. Limited | Dust collecting device |
-
1995
- 1995-05-17 CA CA 2149556 patent/CA2149556A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013091024A1 (en) * | 2011-12-23 | 2013-06-27 | Advantec Australasia Pty. Limited | Dust collecting device |
| AU2012357654B2 (en) * | 2011-12-23 | 2016-07-21 | Advantec Australasia Pty. Limited | Dust collecting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5312465A (en) | Filtration apparatus with bag-like plenum chamber | |
| US5853441A (en) | Portable modular vacuum system | |
| EP1225827B1 (en) | Fume extraction apparatus and assembly | |
| US4968333A (en) | Apparatus for cleaning heating, ventilation, and air conditioning systems | |
| US6290740B1 (en) | Large size clean air workstation | |
| US6926762B2 (en) | Air cleaning apparatus | |
| US6319307B1 (en) | Commercial air filter assembly and filter assembly and filtration unit | |
| US4944780A (en) | Central vacuum cleaner with detachable filter assembly | |
| US4560395A (en) | Compact blower and filter assemblies for use in clean air environments | |
| US6344074B1 (en) | Ventless air scrubber assembly with multi-stage filters and hood enclosure with great entrapment units | |
| US6328776B1 (en) | Air-purifying system | |
| US4955997A (en) | Flush mounted ceiling air cleaner | |
| US5807414A (en) | Clean air work station | |
| US6835128B1 (en) | Ceiling mounted air filtering and distribution apparatus operated independently of any HVAC system | |
| AU1467901A (en) | Double sided work station | |
| ZA200106476B (en) | Improved bagless vacuum cleaner. | |
| US5065668A (en) | Air circulation system | |
| US4521231A (en) | High capacity gas filter system | |
| US3286445A (en) | Recirculating air cleaner | |
| CN208726998U (en) | Air volume control equipment of bag type dust collector | |
| CA2149556A1 (en) | Filtration apparatus with twin conical overhead duct | |
| CN210189351U (en) | Wood dust collecting equipment that polishes | |
| US4218963A (en) | Ventilating system for votive stands | |
| CN213020145U (en) | Air purifier | |
| US20120270489A1 (en) | Welding booth |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |