SE2150784A1 - Filter assembly comprising a bag for filtration of particles in gas flow - Google Patents

Filter assembly comprising a bag for filtration of particles in gas flow

Info

Publication number
SE2150784A1
SE2150784A1 SE2150784A SE2150784A SE2150784A1 SE 2150784 A1 SE2150784 A1 SE 2150784A1 SE 2150784 A SE2150784 A SE 2150784A SE 2150784 A SE2150784 A SE 2150784A SE 2150784 A1 SE2150784 A1 SE 2150784A1
Authority
SE
Sweden
Prior art keywords
outer layer
tubular
inner layer
end portion
tubular outer
Prior art date
Application number
SE2150784A
Other languages
Swedish (sv)
Other versions
SE544959C2 (en
Inventor
Mats Lundin
Original Assignee
Sila Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sila Ab filed Critical Sila Ab
Priority to SE2150784A priority Critical patent/SE544959C2/en
Priority to PCT/EP2022/066506 priority patent/WO2022263606A1/en
Priority to EP22733445.5A priority patent/EP4355456A1/en
Publication of SE2150784A1 publication Critical patent/SE2150784A1/en
Publication of SE544959C2 publication Critical patent/SE544959C2/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles
    • 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
    • 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
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Abstract

A bag (1) for a filter for filtration of particles in a gas flow, wherein the bag (1) comprises: a tubular outer layer (2) comprising a first end portion (3) and an opposite second end portion (4), and a tubular inner layer (5) configured to extend inside the tubular outer layer (2) from an open end portion (6) of the tubular inner layer (5) at the second end portion (4) of the tubular outer layer (2) at least partly along an extent of the tubular outer layer (2), to a closed end portion (7) of the tubular inner layer (5), wherein the tubular outer layer (2) is connected to the open end portion (6) of the tubular inner layer (5), and wherein the tubular inner layer (5) and the tubular outer layer (2) are shaped and sized such that a circumferential space (8) is formed between the tubular inner layer (5) and the tubular outer layer (2).

Description

Technical field The present disclosure relates to air filters for use in industrial vacuum cleaners, and specifically to a bag filter technology for use such a vacuum cleaner.
Background Industrial vacuum cleaners are commonly used to filter particles from an air stream in order to collect the particles in a receptacle. The air passing through the vacuum cleaner may pass several separation steps before being blown out of the vacuum cleaner again. An example of such a filter step is a cyclone which separates larger particles. Another separation step is usually needed to catch finer particles, if desired. Fine particles may be separated from the air stream using a suitable filter comprising a filter material chosen to only let particles smaller than a predetermined size through with the air stream, whilst larger particles than that are trapped in/on the filter media. A challenge is to allow such filters to operate for a long time before needing to be replaced. The vacuum cleaner is sometimes designed to allow the filter to be checked 'chocked' to loosen some of the particles and have them fall down in the receptacle 15. However, not all filter designs allow them to be chocked. Also, a challenge is to design the filter such that a high enough air flow is allowed to run through the filter whilst keeping the size of the filter small.
Summary An object of the invention is to provide a filter which can separate small particles, such as dust from a concrete polishing/grinding process or any other type of dust normally occurring in industrial environments, from an airflow whilst allowing long lifetime of the filter before it need to be replaced. Another object of the present disclosure is to provide a filter which allows a high airflow whilst keeping the size of the filter down. 2 According to a first aspect of the present disclosure, these and other objects are achieved by a bag for a filter for filtration of particles in a gas flow according to claim 1 or any one of its dependent claims 2-6. The bag comprises: a tubular outer layer comprising a first end portion and an opposite second end portion, and a tubular inner layer configured to extend inside the tubular outer layer from an open end portion of the tubular inner layer at the second end portion of the tubular outer layer at least partly along an extent of the tubular outer layer, to a closed end portion of the tubular inner layer, wherein the tubular outer layer is connected to the open-end portion of the tubular inner layer, and wherein the tubular inner layer and the tubular outer layer are shaped and sized such that a circumferential space is formed between the tubular inner layer and the tubular outer layer.
The combination of the tubular outer layer and the tubular inner layer extending inside the tubular outer layer provides a large surface area for filtering of particles from the airflow. Air enters the filter bag through the tubular outer layer from radially outside the tubular outer layer, through the tubular outer layer and into the circumferential space. Air also enters the filter bag through the open-end portion of the tubular inner layer where it passes from radially inside the tubular inner layer and into the circumferential space. The circumferential space between the tubular outer layer and the tubular inner layer provides a passage for filtered air to flow through to exit the bag.
The connection between the tubular outer layer and the tubular inner layer may be formed by a hollow disc-shaped connecting member attached to the tubular outer layer and to the tubular inner layer.
The hollow disc shaped member separates the tubular inner layer and the tubular outer layer at the second end portion, thereby ensuring the circumferential space is not tapering to a narrow shape at the second end portion, which in turn enables improved fluid flow at the second end portion.
The connecting member may be made from a gas permeable filter material, such as needle felt.
Needle felt is a suitable material for filtering small particles such as dust in industrial environments. Also, the needle felt material allows a dust cake formed on the cake side of the filter to separate from the filter material and fall off into a suitable receptacle for cleaning of the filter, thus prolonging the lifetime of the filter.
The connecting member may be sewn to the tubular inner layer and to the tubular outer layer.
The closed end portion of the tubular inner layer is sewn closed.
The tubular outer layer may be formed from a rectangular piece, and the tubular inner layer formed from a rectangular piece of material folded such that it is closed at its closed end portion.
Forming the closed end portion of the tubular inner layer by folding is a simple yet robust way of closing the tubular inner layer.
The closed end portion of the tubular inner layer is sewn closed.
Sewing is a simple yet robust way of ensuring the closed end portion is kept closed whilst enabling high airflow.
According to a second aspect of the present disclosure, the objects are also achieved by a filter assembly comprising a bag and a cage, according to claim 8 or any one of its dependent claims. The filter assembly is for filtration of particles in a gas flow and the filter assembly comprises a bag as described above, and a cage configured to extend between the tubular outer layer and the tubular inner layer for supporting the bag such that the tubular outer layer is extended.
The cage supports the tubular outer layer from within and allows is to withstand overpressure acting on the radially outer side of the tubular outer layer such that the shape of the bag is maintained even at high pressure difference on the cake side and on the clean air side of the layers. The cage also maintains the bag in its extended state before use and in use. Yet, the bag can be replaced when it has reached its end of life and a new bag be fitted on the cage. Replacing only the bag is more environmentally friendly than replacing a whole filter assembly and spare bags can be stored flat/folded to save space.
The closed end portion of the tubular inner layer may be provided with first attachment means and wherein the cage is provided with corresponding second attachment means for removably attaching the closed end portion of the tubular inner layer to the cage with the tubular inner layer extended within the cage.
The attachment means keeps the closed end portion of the filter fixed, which enables a reverse air flow through the filter, for example for cleaning/chocking purposes to remove dust cake from the layers.
The first attachment means may comprise a hole which is optionally provided with an eyelet, and the second attachment means may comprise a hook configured to fit through the hole of the first attachment means.
The hook engages the hole and thereby provide a fixed position of the closed end portion of the inner layer.
The filter assembly may comprise a base plate to which one or more filter assemblies of the type described above are attachable with the first end portion the tubular outer layer of each respective filter assembly interfacing a respective hole of the base plate. The filter assembly is configured to seal between each tubular outer layer and the base plate.
The base plate provides an interface between the one or more filter assemblies and the dust collector/vacuum cleaner. Each filter assembly can be detached and maintained, for example by full replacement of the filter assembly or by change of bag.
The first end portion of the tubular outer layer may be provided with a resilient circumferential rim sized larger than the respective hole of the base plate, wherein the rim is provided with a circumferential recess sized to allow the edge of the respective hole of the base plate to extend into the recess for engaging the rim to the base plate.
The resiliency of the rim enables it to be manually deformed such that it is insertable through the respective hole of the base plate upon being mounted to the base plate, wherein the rim subsequently springs back out to its original shape with the base plate extending into the circumferential recess thereby removably attaching the filter assembly to the base plate.
The tubular outer layer is configured to fit with the first ring and the second ring such that the first ring and the second ring tension the bag onto the rings.
The first ring and the second ring are provided with adhesive or double-sided adhesive tape facing the tubular outer layer.
Brief description of drawings Fig. 1 shows a bag for a filter for filtration of particles in a gas flow.
Fig. 2 shows a cage for supporting the bag shown in fig. 1.
Fig. 3 shows three filter assemblies, each comprising the bag shown in fig. 1 and the cage shown in fig. 2. One of the filter assemblies is shown without its tubular outer layer for illustrative purposes. The filter assemblies are mounted to a base plate suitable for mounting in a vacuum cleaner or dust collector.
Fig. 4 shows a schematic cross-sectional view (not drawn to scale) of an upper portion of a resilient circumferential rim sized larger than the respective hole of the base plate, wherein the rim is provided with a circumferential recess sized to allow the edge of the respective hole of the base plate to extend into the recess for engagement of the rim to the base plate.
Fig. 5 shows a cross-sectional view of an industrial vacuum cleaner fitted with a filter assembly comprising three bag filters. bag for a filter for filtration of patricles in a 1 gas flow 14 hole of first attachment means 2 tubular outer layer 15 receptable 3 first end portion of tubular outer layer 16 hook of second attachment means 4 second end portion of tubular outer layer 17 base plate tubular inner layer 18 hole(s) of base plate 6 open end portion of tubular inner layer 19 resilent circumferential rim 7 closed end portion of tubular inner layer 20 first ring 8 circumferential space between tubular outer 21 second ring 9 hollow disc-shaped connecting member 22 circumferential recess of rim 10 filter assembly 23 adhesive or double-sided adhesive tape 11 cage 24 industrial vacuum cleaner 12 first attachment means of closed end portion 25 distribution chamber 13 second attachment means 26 flexible steel ring Detailed description A bag 1 for a filter for filtration of particles from an airflow, and a related filter assembly according to a first embodiment will hereinafter be described with reference to the appended drawings. As shown in fig. 1, the bag 1 comprises a tubular outer layer 2 comprising a first end portion 3 and an opposite second end portion 4. The bag 1 also comprises a tubular inner layer 5 configured to extend inside the tubular outer layer 2 from an open end portion 6 of the tubular inner layer 5 at the second end portion 4 of the tubular outer layer 2 along an extent of the tubular outer layer 2, to a closed end portion 7 of the tubular inner layer 5. ln other embodiments, the tubular inner layer 5 may alternatively extend only partly along the length of the tubular outer layer 2.
The tubular outer layer 2 is connected to the open end portion 6 of the tubular inner layer 5. Also, the tubular inner layer 5 and the tubular outer layer 2 are shaped and sized such that a circumferential space 8 is formed between the tubular inner layer 5 and the tubular outer layer 2. ln this embodiment, the overall shape of the filter and the circumferential space is cylindrical with a hollow-circular cross section but in other embodiments the general shape of the filter could be configured in other ways, such as with a hollow-rectangular cross-section or somewhere in-betvveen hollow-circular 7 and hollow-rectangular, provided the cage 11 is also configured to support the tubular inner layer 5 and the tubular outer layer 2 as needed. However, a hollow-cylindrical shape is advantageous since it provides substantially circular cross-sectional shaped of the inner tubular layer, which is a shape stable to high-pressures without much support from the cage 11, which enables a less complex design of the cage 11.
The tubular outer layer 2 used to form the general cylindrical shape of the respective tubular inner layer and the tubular outer layer 2 are formed from a rectangular piece of material. Also, the tubular inner layer 5 is formed from a rectangular piece of material folded such that it is closed at its closed end portion 7.
The connection between the tubular outer layer 2 and the tubular inner layer 5 is formed by a hollow disc-shaped connecting member 9 attached to the tubular outer layer 2 and to the tubular inner layer 5. ln other embodiments, the connecting member could alternatively be provided in the form of a portion of the tubular outer layer or the tubular inner layer appropriately shaped to form a connection between the tubular inner layer and the tubular outer layer.
The connecting member 9 is made from a gas permeable filter material, such as needle felt. However, the connecting member could alternatively in other embodiments be made of some other material, such as a piece of non-permeable plastic or rubber. ln this embodiment, the connecting member 9 is sewn to the tubular inner layer 5 and to the tubular outer layer 2 but could in other embodiments alternatively be attached by a suitable adhesive or, depending on the choice of material of the connecting-member, by being injection molded onto the tubular outer layer 2 and the tubular inner layer 5.
The closed end portion 7 of the tubular inner layer 5 is sewn closed but could in other embodiments be closed by using an adhesive or by fitting a piece of plastic to close the inner tubular member.
As shown in figs. 1 and 3-5, the filter assembly comprises: a bag 1 as described above, and 8 a cage 11 configured to extend between the tubular outer layer 2 and the tubular inner layer 5 for supporting the bag 1 such that the tubular outer layer 2 is extended.
The closed end portion 7 of the tubular inner layer 5 is provided with first attachment means 12 and the cage 11 is provided with corresponding second attachment means 13 for removably attaching the closed end portion 7 of the tubular inner layer 5 to the cage 11 with the tubular inner layer 5 extended within the cage 11.
The first attachment means 12 comprises a hole, and the second attachment means 13 comprises a hook 16 configured to fit through the hole 14 of the first attachment means 12. The material around the hole could optionally be reinforced by provision of an eyelet in the hole.
The filter assembly 10 comprises a base plate 17 one or more cages 11 and associated bags 1 are attachable with the first end portion 3 the tubular outer layer 2 of each respective bag 1 interfacing a respective hole 18 of the base plate 17. The filter assembly 10 is configured to seal between each tubular outer layer 2 and the base plate 17.
To achieve a sealing connection between each bag 1 and the base plate, the first end portion 3 of the tubular outer layer 2 is provided with a resilient circumferential rim 19 sized larger than the respective hole 18 of the base plate 17. The resiliency of the rim 19 allows it to be temporarily deformed to fit in the hole 18 of the base plate 17 at installation. The rim 19 is provided with a circumferential recess 22 sized to allow the edge of the respective hole 18 of the base plate 17 to extend into the circumferential recess 22 of the base plate 17 for engagement between the rim 19 and the base plate 17.
The rim 19 comprises a resilient first ring 20, and a resilient second ring 21, wherein the first and second rings 20, 21 are shaped such that the circumferential recess 22 is formed between the first ring 20 and the second ring 21. Each ring is formed by a piece of string/rope but could in other embodiments alternatively be made of any other suitable material. ln this embodiment, the first and second rings 20, 21 are not able to spring back on 9 their own and are thus complimented by a flexible steel ring 26 provided radially inside of the first and second rings 20, 21. The first and second rings 20, 21 are attached to the steel ring 26 by adhesive/adhesive tape 23, but in other embodiments, any other suitable means for enabling alignment/positioning of the first and second rings 20, 21 on the steel ring are possible. Here, the first and second rings 20, 21 provide alignment between the flexible steel ring 26 and the base plate 17. Once mounted to the base plate 17, the steel ring 26 of the rim 19 presses the bag 1 against the edge of the hole 18 in the base plate 17 to seal between the bag 1 and the base plate 17. ln other embodiments, the rim 19 could have any other suitable design allowing it to be releasable attached to the base plate 17, such as a rim design with rigid members movably connected using hinge means or a rim made by injection molding of a suitable flexible thermoplastic material.
The tubular outer layer 2 is configured to fit with the first ring 20 and the second ring 21 such that the first ring 20 and the second ring 21 tension the bag 1 onto the rings 20, 21. ln other embodiments, any other suitable fit between the bag 1 and the rim may be provided.
The filter assembly 10 is for example used in an industrial vacuum cleaner 24 such as the one shown in cross-section in fig. 5 with three bags 1 and cages 11 mounted to a base plate 17. ln use, air passes from the inlet hose through the inlet of the vacuum cleaner 24 and there distributes in a distribution chamber 25 over the cake sides of the bags 1. As filter cake deposit builds up on the bags 1 in use, the filter cake can be shocked or otherwise forced off the bags 1 such that at least a portion of the cake falls into the lower receptacle 15, thereby prolonging the lifetime of the bags 1. From the distribution chamber 25 the air flows into the open end portion 6 of the tubular inner layer 5 and from there through the tubular inner layer 5 and into the circumferential space 8. Also, air flows from the distribution chamber 25 to through the tubular outer layer 2 and into the circumferential space 8. The present bag design provides a large filtering surface area in a small footprint yet allowing use of highly efficient and long-life filtering materials such as needle felt. Needle felt has little rigidity on its own but can be used with the current design of the filter since the tubular outer layer 2 is supported on the cage 11 from its inside thereby preventing implosion of the tubular outer layer 2, and since the tubular inner layer 5 is stably inflated by the incoming air.
After the air has passed through the bag(s) 1 it is routed to a HEPA filter for additional filtering and then released to surrounding air.
The present filter design is especially advantageous for use in collecting fine heavy dust.
The filter technology can be equally well used with other type of devices in which a flow of gas needs filtering of particles, such as other type of dust collectors.

Claims (14)

1. A bag (1 ) for a filter for filtration of particles in a gas flow, wherein the bag (1) comprises: a tubular outer layer (2) comprising a first end portion (3) and an opposite second end portion (4), and a tubular inner layer (5) configured to extend inside the tubular outer layer (2) from an open end portion (6) of the tubular inner layer (5) at the second end portion (4) of the tubular outer layer (2) at least partly along an extent of the tubular outer layer (2), to a closed end portion (7) of the tubular inner layer (5), wherein the tubular outer layer (2) is connected to the open-end portion (6) of the tubular inner layer (5), and wherein the tubular inner layer (5) and the tubular outer layer (2) are shaped and sized such that a circumferential space (8) is formed between the tubular inner layer (5) and the tubular outer layer (2).
2. A bag (1) according to claim 1, wherein the connection between the tubular outer layer (2) and the tubular inner layer (5) is formed by a hollow disc-shaped connecting member (9) attached to the tubular outer layer (2) and to the tubular inner layer (5).
3. A bag (1) according to claim 2, wherein the connecting member (9) is made from a gas permeable filter material, such as needle felt.
4. A bag (1) according to claim 3, wherein the connecting member (9) is sewn to the tubular inner layer (5) and to the tubular outer layer (2).
5. A bag (1) according to any one of claims 1-4, wherein the tubular outer layer (2) is formed from a rectangular piece of material, and wherein the tubular inner layer (5) is formed from a rectangular piece of material folded such that it is closed at its closed end portion (7).
6. A bag (1) according to claim 5, wherein the closed end portion (7) of the tubular inner layer (5) is sewn closed.
7. A filter assembly (10) for filtration of particles in a gas flow, wherein the filter assembly comprises: a bag (1) according to any one of claims 1-6, and a cage (11) configured to extend between the tubular outer layer (2) and the tubular inner layer (5) for supporting the bag (1) such that the tubular outer layer (2) is extended.
8. A filter assembly (10) according claim 7, wherein the closed end portion (7) of the tubular inner layer (5) is provided with first attachment means (12) and wherein the cage (11) is provided with corresponding second attachment means (13) for removably attaching the closed end portion (7) of the tubular inner layer (5) to the cage (11) with the tubular inner layer (5) extended within the cage (11).
9. A filter assembly (10) according to claim 8, wherein the first attachment means (12) comprises a hole which is optionally provided with an eyelet, and wherein the second attachment means (13) comprises a hook configured to fit through the hole of the first attachment means (12).
10. A filter assembly (10) comprising a base plate (17) to which one or more filter assemblies (10) according to any one of claims 7-9 are attachable with the first end portion (3) the tubular outer layer (2) of each respective filter assembly (10) interfacing a respective hole (18) of the base plate (17), wherein the filter assembly (10) is configured to seal between each tubular outer layer (2) and the base plate (17).
11. A filter assembly (10) according to claim 10, wherein the first end portion (3) of the tubular outer layer (2) is provided with a resilient circumferential rim (19) sized larger than the respective hole (18) of the baseplate (17), wherein the rim (19) is provided with a circumferential recess sized to allow the edge of the respective hole (18) of the base plate to extend into the recess for engaging the rim (19) to the base plate (17).
12. A filter assembly (10) according to claim 11, wherein the rim (19) comprises a resilient first ring (20), and a resilient second ring (21), wherein the first and second rings (20, 21) are shaped such that the circumferential recess (22) is formed between the first ring (20) and the second ring (21).
13. A filter assembly (10) according to claim 11, wherein the tubular outer layer (2) is configured to fit with the first ring (20) and the second ring (21) such that the first ring (20) and the second ring (21) tension the bag (1) onto the rings (20, 21 ).
14. A filter assembly (10) according to claim 13, wherein the first ring (20) and the second ring (21) are provided with adhesive or double-sided adhesive tape (23) facing the tubular outer layer (2).
SE2150784A 2021-06-17 2021-06-17 Filter assembly comprising a bag for filtration of particles in gas flow SE544959C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE2150784A SE544959C2 (en) 2021-06-17 2021-06-17 Filter assembly comprising a bag for filtration of particles in gas flow
PCT/EP2022/066506 WO2022263606A1 (en) 2021-06-17 2022-06-16 Air filter device
EP22733445.5A EP4355456A1 (en) 2021-06-17 2022-06-16 Air filter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2150784A SE544959C2 (en) 2021-06-17 2021-06-17 Filter assembly comprising a bag for filtration of particles in gas flow

Publications (2)

Publication Number Publication Date
SE2150784A1 true SE2150784A1 (en) 2022-12-18
SE544959C2 SE544959C2 (en) 2023-02-07

Family

ID=82196423

Family Applications (1)

Application Number Title Priority Date Filing Date
SE2150784A SE544959C2 (en) 2021-06-17 2021-06-17 Filter assembly comprising a bag for filtration of particles in gas flow

Country Status (3)

Country Link
EP (1) EP4355456A1 (en)
SE (1) SE544959C2 (en)
WO (1) WO2022263606A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884659A (en) * 1974-06-03 1975-05-20 Flex Kleen Corp Filter bag assembly for pulse jet collector
US4292057A (en) * 1975-09-29 1981-09-29 Flex Kleen Corp. Top removal support for dust collector bags
SE451862B (en) * 1985-01-22 1987-11-02 Soederhamn Ind Arbetshygien Ab Dust separator
US5308369A (en) * 1993-04-28 1994-05-03 Griffin Environmental Company, Inc. Snap-in filter bag assembly for bottom loading in dust collector
GB2307426A (en) * 1995-11-23 1997-05-28 Scapa Group Plc Filter sleeve
US20090255226A1 (en) * 2007-11-09 2009-10-15 E. I. Du Pont De Nemours And Company Thermally stabilized bag house filters and media
CN102151442A (en) * 2011-03-22 2011-08-17 孙伟东 Integral dust-removal filtering bag with internal and external filtering double-bag sleeve structure
CN104117249B (en) * 2013-04-27 2016-04-27 辽宁万和环保产业有限公司 A kind of concentric hollow dedusting filtering bag

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3850594A (en) * 1971-07-16 1974-11-26 Summit Filter Corp Filtering method utilizing a double-wall filter bag construction
BE786209A (en) * 1971-07-16 1973-01-15 Summit Filter Corp Double walled filter bag - provides increased area in given volume esp for air filter
KR100790334B1 (en) * 2007-06-22 2008-01-03 주식회사 신성플랜트 Filter bag using in a dust-collector
CN111482014B (en) * 2020-03-18 2022-12-20 江苏东方滤袋股份有限公司 Prevent electrostatic precipitator filter bag
CN111544973B (en) * 2020-04-07 2021-10-29 东南大学 Bag bottom reinforced filter bag dust removal method with variable inner channel and filter device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884659A (en) * 1974-06-03 1975-05-20 Flex Kleen Corp Filter bag assembly for pulse jet collector
US4292057A (en) * 1975-09-29 1981-09-29 Flex Kleen Corp. Top removal support for dust collector bags
SE451862B (en) * 1985-01-22 1987-11-02 Soederhamn Ind Arbetshygien Ab Dust separator
US5308369A (en) * 1993-04-28 1994-05-03 Griffin Environmental Company, Inc. Snap-in filter bag assembly for bottom loading in dust collector
GB2307426A (en) * 1995-11-23 1997-05-28 Scapa Group Plc Filter sleeve
US20090255226A1 (en) * 2007-11-09 2009-10-15 E. I. Du Pont De Nemours And Company Thermally stabilized bag house filters and media
CN102151442A (en) * 2011-03-22 2011-08-17 孙伟东 Integral dust-removal filtering bag with internal and external filtering double-bag sleeve structure
CN104117249B (en) * 2013-04-27 2016-04-27 辽宁万和环保产业有限公司 A kind of concentric hollow dedusting filtering bag

Also Published As

Publication number Publication date
SE544959C2 (en) 2023-02-07
EP4355456A1 (en) 2024-04-24
WO2022263606A1 (en) 2022-12-22

Similar Documents

Publication Publication Date Title
AU783286B2 (en) Vacuum cleaner filter assembly
EP1563890B1 (en) System for mounting filters in a tubesheet
US5730766A (en) Non-round unitary filter cartridge
US7267706B2 (en) Air filter
US4350509A (en) Disposable air cleaner
US9161667B2 (en) Vacuum cleaner with enhanced surface area filter
CN104740944B (en) Filtering device used for gas-solid separation
CA2258429A1 (en) Vacuum cleaner having a dual filter assembly
US20040237483A1 (en) Filter cartridge mounting structure
JP2012115443A (en) Dust collector
US4056374A (en) Tubular gas filter
AU2022263487A1 (en) Improvements in or for filtration systems
GB2396097A (en) Reusable filter assembly for vacuum cleaner
SE2150784A1 (en) Filter assembly comprising a bag for filtration of particles in gas flow
GB2246717A (en) Filter assembly for vacuum cleaners
US20050060969A1 (en) Vacuum conveyor device with a multi-stage filter system
US20160206168A1 (en) Two stage filter system for vacuum cleaners
CN210354555U (en) A dirt cup subassembly for removing mite appearance
CN210612022U (en) A filter dirt cup for removing mite appearance
JP7222740B2 (en) Dust collector filter replacement method and filter
CN217312498U (en) Dust removal cloth bag device capable of being recycled
CN220175015U (en) Barrel type dust collector
AU2016203541A1 (en) A vacuum cleaner
CA2536413C (en) Vacuum cleaner filter assembly
NZ720630B2 (en) A vacuum cleaner