CA1106779A - Holder for annular filter - Google Patents
Holder for annular filterInfo
- Publication number
- CA1106779A CA1106779A CA318,445A CA318445A CA1106779A CA 1106779 A CA1106779 A CA 1106779A CA 318445 A CA318445 A CA 318445A CA 1106779 A CA1106779 A CA 1106779A
- Authority
- CA
- Canada
- Prior art keywords
- holder
- aperture
- ring
- sealing ring
- support plate
- 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
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
HOLDER FOR ANNULAR FILTER
ABSTRACT
Holder for an annular filter includes a support frame or basket with a flared portion at its upper end which cooperates with the inner leg of an inverted U-shaped sealing ring to clamp the upper end of the filter. The sealing ring has its outer leg seated on a sealing gasket positioned on top of a support plate surrounding an aperture through which the filter is lowered during operation of a particle collection apparatus. The holder is replaceably sealed in position by screwing a pair of threaded rings together to force the flared portion downwardly. The diameters of the various parts are larger than the aperture to prevent them from being dropped through the aperture and the overall design is such that the filters can be replaced from the upper clean side of the col-lection apparatus rather than the lower dirty side.
ABSTRACT
Holder for an annular filter includes a support frame or basket with a flared portion at its upper end which cooperates with the inner leg of an inverted U-shaped sealing ring to clamp the upper end of the filter. The sealing ring has its outer leg seated on a sealing gasket positioned on top of a support plate surrounding an aperture through which the filter is lowered during operation of a particle collection apparatus. The holder is replaceably sealed in position by screwing a pair of threaded rings together to force the flared portion downwardly. The diameters of the various parts are larger than the aperture to prevent them from being dropped through the aperture and the overall design is such that the filters can be replaced from the upper clean side of the col-lection apparatus rather than the lower dirty side.
Description
HOLDER FOR ANN~LAR FILTER
SPECIFICATION
The invention relates to holders of the type used for the attachment and sealing of bag-like annular filter tubes which comprise a supporting bas}cet suspended from an end plate.
The supporting basket has a venturi tube at its upper end which merges upwardly and outwardly into a widened-out annular collar, the conically constructed annular face of which can be pressed against a sealing ring, the filter tube being interposed between the sealing ring and the annular face.
Threaded holders of this type are used for attaching a filter tube unit to the end plate in a container, particularly in air purifying installations, in order to cleanse the air emanating from an industrial process which is contaminated by small particles. The purpose of the threaded holder is to secure the filter tube in sealing-tight fashion to the end plate but permit easy replacement of the filter tube when it - becomes torn or clogged.
A known threaded holder of the aforementioned type is disclosed in U.S. Patent No. 3,856,489. The known holder has two conical portions which, for sealing the filter tube, have to be moved onto each other and against a threaded sup-porting means which is suspended from the end plate. The filter tube is clamped between these conical portions along which a continuous seal is formed. The purpose oE this is to prevent unfiltered air passing into a part of the unit carrying the filtered or purified air. However, the known threaded holder . . - .
. .
77~3 also has a second seal between the top of the annular collar of the tube and a portion of the threaded supporting means to provide a double seal and to prevent unfiltered air leakiny into the filter unit. For example, it may happen that the first-mentioned seal with the two conical portions becomes defect:ive due to irregularities, whereupon this secondary seal is intended to take over the sealing function.
A disadvantage of the known threaded holder is that the filter tube, the supporting basket and also the screwed holder must be detached from the side on which the dust-laden gas or air is present, i e. from the underside of the end plate. It can happen that parts of the known attachment will fall into the collecting bin and damage the delivery means when the plant is started.
Also, it is very dirty in the compartment containing the bags and thus a very undesirable place in which to work.
The object of the invention is to improve the ~nown threaded holder so that, while providing an optimum sealing effect with the simplest of means, the threaded connection is made from the purified side of the filter, i.e., above the end plate, and with no possibility that any part of the holder assembly can fall into the collecting bin.
According to the present invention, there is provided a holder for an annular filter adapted to be hung from a ho:rizontal support plate, the holder including a support basket having at its upper end a venturi tube portion with an upwardly and outwardly extending flared collar portion, and a seal ring having a tapered wall surface which cooperates with the flared collar portion to loc]c the open end wall portion of an open ended annular bag type filter within which the support basket ~h/
77~
is suspended between the tapered wall surface and the collar portion when a down~ard force is applied to the upper peripheral edge of the collar portion. The support plate contains a circular aperture of sufficient diameter to accommodate those portions of the support basket which are located below the collar portion, -the horizontal rim surface of the support plate surrounding and defining the circular a~erture serving as a support for an outer peripheral portion of the sealing ring. A
threaded base ring is fixed to and extends upwardly from the support plate about the aperture, and a complementary threaded locking ring is provided for threaded engagement with the base ring. The locking ring has an aperture in its center aligned with the venturi tube portion and a horizontal portion surrounding the center aperture which engages the upper peripheral edge of the flared collar .
portion and applies a locking force on the filter as the locking ring is rotated toward the support plate.
Other features which may be present in a specific embodiment of the invention is that of making the diameters of the sealing ring, the base ring and the locking ring all larger than the diameter of the aperture in the end plate. The sealing ring may have more or less the cross-- section of an inverted U. The heigh-t of the base ring rising from the support plate is smaller than the height of the flared collar portion of the venturi tube portian.
A sealing gasket may be positioned between the rim surface and the ou-ter peripheral portion of the sealing ring.
The end or support plate is the boundary between the dus-t-laden chamber and the clean gas chamber. The aperture in the end plate is fully occupied by the filter tube. By dimensioning all the par-ts of the sealing arrangement such that the aforemen-tioned ratio of diameters ~ _ ~ ,7~
is achieved, the parts cannot possibly ~all into the collecting bin and damage the discharge elements, such as for example, augers, bucket wheel sluices and the like.
Thus, it is possible for servicing personnel to exchange the filter media from the clean gas side of the filter without having to take any special care in handling the individual parts of the threaded holder.
As previously noted, the sealing ring may have a cross-section more or less in the shape of an inverted U. One free leg, namely that having the larger diameter, supports the sealing ring against the sealing gasket and the rim of the aperture in the end plate. The opposite leg of the U is preferably shaped to conform to the angle of the annular collar of the venturi tube to insure an extended contact surface for locking the filter tube in position.
As indicated, the height of the base ring pro-jecting up from the bottom plate may be less than the height of the raised annular collar of the venturi tube.
This measure insures that when the locking ring is screwed onto the base ring it will press the supporting basket with the venturi tube downwards against the sealing sur-face of the sealing ring. As a result, the annular sealing gasket is pressed against the rim of the aperture in the end plate so that an optimum sealing effect is guaranteed between the dust-laden gas chamber and the clean gas chamber.
With the design according to the invention, it is possible to ~uickly and easily change the filter medium, i.e. the filter tube by merely unscrewing the locking ring from the base ring. A pair of lugs on the sb/ ,~
~ 77 ~
locking ring permit this to be easily done by hand.
BRIEF DESCRIPTION OF THE DRAWI~GS
Fig. 1 shows a partly cut away and sectional view of the threaded holder including the filter tube and supporting 5a -sb/~
''.
~ 3~ ~¢~
basket; and Fig. 2 is a diagrammatic perspective exploded view of the individual parts of the threaded holder but utilizes a modified locking cap.
DESCRIPTION OF THE PREFERRED EMBODIMENT
. _ The horizontal support or end plate 1 is rigidly mounted in the air purifying chamber, not shown. A base member 2 is mount-ed on the end plate by means of screws or rivets not shown but which can be passed through the bores 3. The base member 2 has an upstanding base ring portion 4 which carries on its outer face a screwthread indicated in Fig. 1. Corresponding to this screwthread there is a female screwthread on a locking cap or ring 5 which can, without the use of small tools such as for example a screwdriver or wrench, be tightened down onto the base ring ~; this screwing action may be performed either by the fluted edge 6" and the molded grip members 6' provided in dia-metrically opposed relationship on the locking ring 5' as in the case of the embodiment shown in Fig. 2, or by means of welded ribs 6 as in the embodiment shown in Fig. 1.
The support basket 8 has the ven-turi tube portion 9 mounted on it such as by welding. The filter tube 10, which is preferably made of a cloth fabric, is placed, with its open end wall portion 10' facing upwardly, through the aperture 7 in the end plate 1, the edge of which can be seen in Fig. 1.
The venturi tube portion 9 has an upwardly and outwardly flared annular collar portion 11 which has a conical annular face at the location designated 12 in Fig. 1. In an outwards direction, there is alongside this annular face 12 a sealing ring 13, of the cross-section of which is U-shaped, and which is supported at the bottom of one leg 13', through an annular sealing gasket 14, on the rim ]L' of the aperture 7 in the end plate 1. Opposite the conical annular face 12 on the venturi tube portion 9 a corresponding tapered wall surface 15 is pro-vided by the oblique attitude of one leg, namely the inner leg, of the U-shaped sealing ring 13. The filtered tube 10 is pulled ` upwardly and around the flared annular collar portion.ll, as shown in Fig. 1.
The drawings reveal the ease with which the threaded holder can be assembled and dismantled and also -the perfect sealing action which results from the fact that the locking ring 5 is screwed up tight, which automatically presses its horizontal portion 5" which surrounds central aperture portion 5"' against the flared annular collar portion 11 downwards against the tapered wall surface 15 of the sealing ring 13, the flatly compressed filter tube 10 being interposed between the said two parts. In turn, this does at the same time provide for sealing-tight pressure o~ that leg 13' of the sealing ring 13 which is opposite the leg 15 down onto the annular sealing gasket 14 and thus onto the rim of the aperture 7 in the end plate 1. , When a filter tube 10 needs to be changed, the drawings futhermore show the ease with which it can be unscrewed and ex-changed without any movable parts of the threaded holder being able to fall down into the dust-laden gas chamber through the aperture 7 in the end plate 1.
7~
It is not intended that the invention be confined to a screwthreaded connection between the base ring portion 4 and the locking ring 5 or 5'. Such a connection can also be achieved by a bayonet connection or by other types of connection which guarantee rapid detachment of both parts with simultaneous parallelity of the mating surfaces. The parts of the holder .
may be made of any suitable material, usually metal, although the locking ring 5' in Fig 2 could be made of molded piastic, for example. . ~- - - .~. . -
SPECIFICATION
The invention relates to holders of the type used for the attachment and sealing of bag-like annular filter tubes which comprise a supporting bas}cet suspended from an end plate.
The supporting basket has a venturi tube at its upper end which merges upwardly and outwardly into a widened-out annular collar, the conically constructed annular face of which can be pressed against a sealing ring, the filter tube being interposed between the sealing ring and the annular face.
Threaded holders of this type are used for attaching a filter tube unit to the end plate in a container, particularly in air purifying installations, in order to cleanse the air emanating from an industrial process which is contaminated by small particles. The purpose of the threaded holder is to secure the filter tube in sealing-tight fashion to the end plate but permit easy replacement of the filter tube when it - becomes torn or clogged.
A known threaded holder of the aforementioned type is disclosed in U.S. Patent No. 3,856,489. The known holder has two conical portions which, for sealing the filter tube, have to be moved onto each other and against a threaded sup-porting means which is suspended from the end plate. The filter tube is clamped between these conical portions along which a continuous seal is formed. The purpose oE this is to prevent unfiltered air passing into a part of the unit carrying the filtered or purified air. However, the known threaded holder . . - .
. .
77~3 also has a second seal between the top of the annular collar of the tube and a portion of the threaded supporting means to provide a double seal and to prevent unfiltered air leakiny into the filter unit. For example, it may happen that the first-mentioned seal with the two conical portions becomes defect:ive due to irregularities, whereupon this secondary seal is intended to take over the sealing function.
A disadvantage of the known threaded holder is that the filter tube, the supporting basket and also the screwed holder must be detached from the side on which the dust-laden gas or air is present, i e. from the underside of the end plate. It can happen that parts of the known attachment will fall into the collecting bin and damage the delivery means when the plant is started.
Also, it is very dirty in the compartment containing the bags and thus a very undesirable place in which to work.
The object of the invention is to improve the ~nown threaded holder so that, while providing an optimum sealing effect with the simplest of means, the threaded connection is made from the purified side of the filter, i.e., above the end plate, and with no possibility that any part of the holder assembly can fall into the collecting bin.
According to the present invention, there is provided a holder for an annular filter adapted to be hung from a ho:rizontal support plate, the holder including a support basket having at its upper end a venturi tube portion with an upwardly and outwardly extending flared collar portion, and a seal ring having a tapered wall surface which cooperates with the flared collar portion to loc]c the open end wall portion of an open ended annular bag type filter within which the support basket ~h/
77~
is suspended between the tapered wall surface and the collar portion when a down~ard force is applied to the upper peripheral edge of the collar portion. The support plate contains a circular aperture of sufficient diameter to accommodate those portions of the support basket which are located below the collar portion, -the horizontal rim surface of the support plate surrounding and defining the circular a~erture serving as a support for an outer peripheral portion of the sealing ring. A
threaded base ring is fixed to and extends upwardly from the support plate about the aperture, and a complementary threaded locking ring is provided for threaded engagement with the base ring. The locking ring has an aperture in its center aligned with the venturi tube portion and a horizontal portion surrounding the center aperture which engages the upper peripheral edge of the flared collar .
portion and applies a locking force on the filter as the locking ring is rotated toward the support plate.
Other features which may be present in a specific embodiment of the invention is that of making the diameters of the sealing ring, the base ring and the locking ring all larger than the diameter of the aperture in the end plate. The sealing ring may have more or less the cross-- section of an inverted U. The heigh-t of the base ring rising from the support plate is smaller than the height of the flared collar portion of the venturi tube portian.
A sealing gasket may be positioned between the rim surface and the ou-ter peripheral portion of the sealing ring.
The end or support plate is the boundary between the dus-t-laden chamber and the clean gas chamber. The aperture in the end plate is fully occupied by the filter tube. By dimensioning all the par-ts of the sealing arrangement such that the aforemen-tioned ratio of diameters ~ _ ~ ,7~
is achieved, the parts cannot possibly ~all into the collecting bin and damage the discharge elements, such as for example, augers, bucket wheel sluices and the like.
Thus, it is possible for servicing personnel to exchange the filter media from the clean gas side of the filter without having to take any special care in handling the individual parts of the threaded holder.
As previously noted, the sealing ring may have a cross-section more or less in the shape of an inverted U. One free leg, namely that having the larger diameter, supports the sealing ring against the sealing gasket and the rim of the aperture in the end plate. The opposite leg of the U is preferably shaped to conform to the angle of the annular collar of the venturi tube to insure an extended contact surface for locking the filter tube in position.
As indicated, the height of the base ring pro-jecting up from the bottom plate may be less than the height of the raised annular collar of the venturi tube.
This measure insures that when the locking ring is screwed onto the base ring it will press the supporting basket with the venturi tube downwards against the sealing sur-face of the sealing ring. As a result, the annular sealing gasket is pressed against the rim of the aperture in the end plate so that an optimum sealing effect is guaranteed between the dust-laden gas chamber and the clean gas chamber.
With the design according to the invention, it is possible to ~uickly and easily change the filter medium, i.e. the filter tube by merely unscrewing the locking ring from the base ring. A pair of lugs on the sb/ ,~
~ 77 ~
locking ring permit this to be easily done by hand.
BRIEF DESCRIPTION OF THE DRAWI~GS
Fig. 1 shows a partly cut away and sectional view of the threaded holder including the filter tube and supporting 5a -sb/~
''.
~ 3~ ~¢~
basket; and Fig. 2 is a diagrammatic perspective exploded view of the individual parts of the threaded holder but utilizes a modified locking cap.
DESCRIPTION OF THE PREFERRED EMBODIMENT
. _ The horizontal support or end plate 1 is rigidly mounted in the air purifying chamber, not shown. A base member 2 is mount-ed on the end plate by means of screws or rivets not shown but which can be passed through the bores 3. The base member 2 has an upstanding base ring portion 4 which carries on its outer face a screwthread indicated in Fig. 1. Corresponding to this screwthread there is a female screwthread on a locking cap or ring 5 which can, without the use of small tools such as for example a screwdriver or wrench, be tightened down onto the base ring ~; this screwing action may be performed either by the fluted edge 6" and the molded grip members 6' provided in dia-metrically opposed relationship on the locking ring 5' as in the case of the embodiment shown in Fig. 2, or by means of welded ribs 6 as in the embodiment shown in Fig. 1.
The support basket 8 has the ven-turi tube portion 9 mounted on it such as by welding. The filter tube 10, which is preferably made of a cloth fabric, is placed, with its open end wall portion 10' facing upwardly, through the aperture 7 in the end plate 1, the edge of which can be seen in Fig. 1.
The venturi tube portion 9 has an upwardly and outwardly flared annular collar portion 11 which has a conical annular face at the location designated 12 in Fig. 1. In an outwards direction, there is alongside this annular face 12 a sealing ring 13, of the cross-section of which is U-shaped, and which is supported at the bottom of one leg 13', through an annular sealing gasket 14, on the rim ]L' of the aperture 7 in the end plate 1. Opposite the conical annular face 12 on the venturi tube portion 9 a corresponding tapered wall surface 15 is pro-vided by the oblique attitude of one leg, namely the inner leg, of the U-shaped sealing ring 13. The filtered tube 10 is pulled ` upwardly and around the flared annular collar portion.ll, as shown in Fig. 1.
The drawings reveal the ease with which the threaded holder can be assembled and dismantled and also -the perfect sealing action which results from the fact that the locking ring 5 is screwed up tight, which automatically presses its horizontal portion 5" which surrounds central aperture portion 5"' against the flared annular collar portion 11 downwards against the tapered wall surface 15 of the sealing ring 13, the flatly compressed filter tube 10 being interposed between the said two parts. In turn, this does at the same time provide for sealing-tight pressure o~ that leg 13' of the sealing ring 13 which is opposite the leg 15 down onto the annular sealing gasket 14 and thus onto the rim of the aperture 7 in the end plate 1. , When a filter tube 10 needs to be changed, the drawings futhermore show the ease with which it can be unscrewed and ex-changed without any movable parts of the threaded holder being able to fall down into the dust-laden gas chamber through the aperture 7 in the end plate 1.
7~
It is not intended that the invention be confined to a screwthreaded connection between the base ring portion 4 and the locking ring 5 or 5'. Such a connection can also be achieved by a bayonet connection or by other types of connection which guarantee rapid detachment of both parts with simultaneous parallelity of the mating surfaces. The parts of the holder .
may be made of any suitable material, usually metal, although the locking ring 5' in Fig 2 could be made of molded piastic, for example. . ~- - - .~. . -
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A holder for an annular filter adapted to be hung from a horizontal support plate, said holder comprising a support basket having at its upper end a venturi tube portion with an upwardly and outwardly extending flared collar portion, a sealing ring having a tapered wall surface which cooperates with said flared collar portion to lock the open end wall portion of an open ended annular bag type filter within which said support basket is suspended between said tapered wall surface and said collar portion when a downward force is applied to the upper peripheral edge of said collar portion, said support plate containing a circular aperture of sufficient diameter to accommodate those portions of said support basket which are located below said collar portion, the horizontal rim surface of said support plate surrounding and defining said circular aperture serving as a support for an outer peripheral portion of said sealing ring, a threaded base ring fixed to and extending upwardly from said support plate about the aperture, a complementary threaded locking ring in threaded engagement with said base ring, said locking ring having an aperture in its center aligned with said venturi tube portion and a horizontal portion surrounding said center aperture which engages the upper peripheral edge of said flared collar portion and applies a locking force on said filter as said locking ring is rotated toward said support plate.
2. The holder of Claim 1 wherein the diameters of the sealing ring, the base ring and the locking ring are all larger than the diameter of the aperture in the end plate.
3. The holder of Claim 2 wherein the sealing ring has more or less the cross-sectional shape of an inverted U.
4. The holder of Claim 3 wherein the height of the base ring rising from the support plate is smaller than the height of the flared collar portion of the venturi tube portion.
5. The holder of Claim 1, 2 or 3 and further comprising a sealing gasket positioned between said rim surface and said outer peripheral portion of said sealing ring.
6. The holder of Claim 4 and further comprising a sealing gasket positioned between said rim surface and said outer peripheral portion of said sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA318,445A CA1106779A (en) | 1978-12-21 | 1978-12-21 | Holder for annular filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA318,445A CA1106779A (en) | 1978-12-21 | 1978-12-21 | Holder for annular filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1106779A true CA1106779A (en) | 1981-08-11 |
Family
ID=4113176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA318,445A Expired CA1106779A (en) | 1978-12-21 | 1978-12-21 | Holder for annular filter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1106779A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111529871A (en) * | 2020-04-24 | 2020-08-14 | 蚌埠医学院第一附属医院（蚌埠医学院附属肿瘤医院） | Gas warming type tracheal cannula |
-
1978
- 1978-12-21 CA CA318,445A patent/CA1106779A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111529871A (en) * | 2020-04-24 | 2020-08-14 | 蚌埠医学院第一附属医院（蚌埠医学院附属肿瘤医院） | Gas warming type tracheal cannula |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |