US20010033060A1 - Joint assembly for joining a ceramic membrane to a tube sheet - Google Patents
Joint assembly for joining a ceramic membrane to a tube sheet Download PDFInfo
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- US20010033060A1 US20010033060A1 US09/809,389 US80938901A US2001033060A1 US 20010033060 A1 US20010033060 A1 US 20010033060A1 US 80938901 A US80938901 A US 80938901A US 2001033060 A1 US2001033060 A1 US 2001033060A1
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- United States
- Prior art keywords
- ceramic membrane
- passageway
- joint assembly
- ceramic
- sealing element
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/20—Packing materials therefor
- F16J15/22—Packing materials therefor shaped as strands, ropes, threads, ribbons, or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
Definitions
- the present invention relates to a joint assembly for joining a ceramic membrane of tubular form to a tube sheet used in supporting the ceramic membrane within a reactor. More particularly, the present invention relates to such a joint assembly in which the ceramic membrane is received and sealed within a fixture connected to the tube sheet.
- Ceramic membranes are used to separate a gaseous component from a mixture, for instance, oxygen from air. Ceramic membranes are gas tight and function by allowing ions to selectively migrate through the membrane. The disassociation and ionization of the selected gas occurs at a membrane surface where electrons are picked up from near surface electronic states. The flux of the ions is charged compensated by a simultaneous flux of electronic charge carriers through the ceramic membrane. When the ions arrive at the opposite side of the membrane, the individual ions release their electrons and recombine to form gas molecules.
- the driving force for such transport can be a differential partial pressure of the selected gas applied across the membrane or an external source of electric power.
- Ceramic membranes can be employed in the form of tubes located within reactors. Critical to the success of the reactor is both the survival of such ceramic membranes and adequate sealing at a location where the tubular ceramic element is joined with the reactor, generally at a tube sheet. Since ceramic membranes exhibit ion conductivity at temperatures that are well above 500° C., generally in the range of between about 600° C. and about 1000° C. the joint assembly and seal between the ceramic membrane and the tube sheet are subjected to extreme environmental conditions.
- a major obstacle in developing a viable seal are the unique thermomechanical properties of ceramic materials, e.g. high thermal expansion and compositional dilation and the high operational temperatures of the membranes. Both factors prohibit the use of common fixed joining techniques such as glass sealing or brazing. Instead, joining techniques that do not rigidly affix the ceramic within the reactor are used such as non-bonding, compression type joint assembles. For instance, both U.S. Pat. No. 5,820,654 and U.S. Pat. No. 5,820,655 use either a sliding or fixed seal with a bellows at the juncture of the ceramic membrane and the tube sheet.
- U.S. Pat. No. 4,917,302 utilizes a stack of ceramic wafers located within a rectangular groove along the side of a movable engine panel. The engine panel is sealed to an adjacent side wall by the ceramic wafers which are held in position by a pressurized linear bellows that also fits within the groove.
- U.S. Pat. No. 5,082,293 shows a similar seal except that the sealing element instead of consisting of a stack of wafers is made up of multiple layers of a fiber wound about a core. The materials for such fibers can be alumina-boriasilicate or silicon-carbide.
- 5,301,595 discloses a rope seal having a core of ceramic fibers and a cover of stainless steel.
- the rope seal is designed to seat within a groove in one component and bear against a flat wall of another component.
- U.S. Pat. No. 4,394,023 shows a high temperature valve stem packing that incorporates graphite seal rings composed of coiled graphite tape held between metal packing adapter rings that bear against the graphite seal rings.
- the present invention provides a joint assembly that is designed to advantageously utilize high temperature sealing materials, such as those identified above and to hold the ceramic membrane in place.
- the present invention provides a joint assembly for joining a ceramic membrane of tubular configuration to a tube sheet.
- the joint assembly has a fixture connected to the tube sheet and including a passageway having a narrow end section, located at one end of the passageway, to receive the ceramic membrane.
- a sealing surface, defined by the passageway, is located at the one end thereof.
- the ceramic membrane extends through the narrow end section of the passageway so that an open end of the ceramic membrane is located within the passageway and an adjacent lateral surface of the membrane is surrounded by the sealing surface.
- At least one sealing element is located between the sealing surface and the lateral surface of the ceramic membrane.
- a follower is located within the passageway and bears against the at least one sealing element in a direction towards the narrow end section of the passageway.
- This action simultaneously drives the at least one sealing element against the sealing surface and the lateral surface of the ceramic membrane by compression of the at least one sealing element.
- a seal is effected between the fixture and the ceramic membrane and the ceramic membrane is held in place by frictional forces developed between the at least one sealing element and the ceramic membrane.
- the follower is provided with an inner passage in communication with the open end of the ceramic membrane to allow permeate or feed to flow through the follower.
- the sealing surface can be formed by a tapered section of said passageway, tapering towards the narrow end section.
- the passageway is also provided with an annular end surface connecting the tapered section of said passageway with the narrow end section.
- the follower has a fusto-conical end element configured to fit within said tapered section of said passageway and to bear against said at least one sealing element.
- the fixture bears against the ceramic membrane to compress the at least one sealing element.
- the fixture of the joint assembly includes a passageway having a narrow end section, located at one end of the passageway.
- a sealing surface surrounds and is located adjacent to the narrow end section.
- the ceramic membrane has an enlarged end portion at an open end thereof. The enlarged end portion is located within the passageway with the ceramic membrane extending from the narrow end section of the passageway.
- At least one sealing element is located between the sealing surface and the enlarged end portion of the ceramic membrane and a follower, located within the passageway, bears against the enlarged end portion of the ceramic membrane in a direction towards the narrow end section of the passageway.
- the follower is provided with an inner passage in communication with the open end of the ceramic membrane to allow feed or permeate to flow through the follower.
- the enlarged end portion of the ceramic membrane can be formed by an outwardly flared portion of the ceramic membrane to produce an outwardly flared lateral surface thereof.
- the sealing surface is formed by a tapered section of the passageway, tapering towards the narrow end section.
- the at least one sealing element is a cone seal gasket located between said outwardly flared lateral surface and said sealing surface.
- An annular butt seal gasket is located between the follower and the open end of said ceramic membrane in alignment with the inner passageway of the follower.
- the sealing surface is an annular end surface of the passageway surrounding the narrow end section thereof.
- the enlarged end portion has an annular undersurface located opposite to the annular end surface and the at least one sealing element comprises a annular butt seal gasket located between said annular undersurface and said annular end surface.
- the follower also has an end section having a cavity configured to receive the enlarged end portion of said ceramic membrane.
- the enlarged end portion of the ceramic membrane and the cavity can be of fusto-connical configuration.
- a cone-seal gasket is located between the enlarged end portion and the cavity.
- a butt seal gasket is located between the open end of the ceramic membrane and the follower, in alignment with the passage thereof.
- the at least one sealing element can be formed of a rope-like packing wound around the lateral surface of the ceramic membrane.
- the at least one sealing element can be formed of a paper or felt stuffing of the ceramic material.
- the ceramic material can be an aluminosilicate fiber or a zirconia fiber.
- the ceramic material can be infiltrated with a particulate material and preferably such particulate material can be a ceramic or a metal.
- the sealing element can generally be formed of a ceramic mineral such as vermiculite.
- the at least one sealing element can also be formed of a layer of a ceramic powder or a graphite packing.
- the fixture can be provided with an inlet port for introduction of a buffer gas into the fixture.
- FIG. 1 is a schematic view of a joint assembly in accordance with the present invention
- FIG. 2 is an enlarged fragmentary view of an embodiment of the joint assembly shown in FIG. 1;
- FIG. 3 is an enlarged fragmentary view of an alternative embodiment of the joint assembly shown in FIG. 1;
- FIG. 4 is a schematic view of an alternative embodiment of a joint assembly in accordance with the present invention.
- FIG. 5 is an enlarged fragmentary view of an alternative embodiment of sealing elements used in the embodiment shown in FIG. 2;
- FIG. 6 is an enlarged fragmentary view of an alternative embodiment of sealing elements used in the embodiment shown in FIG. 2.
- Joint assembly 1 is illustrated for sealing in open end of a ceramic membrane 2 of tubular configuration to a tube sheet 3 .
- Joint assembly 1 includes a fixture 10 connected to tube sheet 3 and a follower 12 having a hex-like head 13 .
- Follower 12 and its hex-like head 13 are provided with internal bores 14 and 15 , respectively, that form an inner passage to allow a permeate or feed stream to flow through follower 12 and therefore joint assembly 1 .
- follower 12 fits within the fixture 10 with a threaded engagement 17 to exert pressure against a sealing element 16 .
- hex-like head 13 of follower 12 facilitates the threading of follower 12 into fixture 10 .
- fixture 10 and follower 12 can be fabricated from HAYNES 230 alloy.
- HAYNES 214 and INCOLOY 800 are other possible materials.
- fixture 10 is provided with a passageway 18 having a narrow end section 20 located at one end of passageway 18 .
- a sealing surface 22 is formed by an inner tapered section of a passageway 18 that tapers towards narrow end section 20 .
- Narrow end section 20 and inner tapered sealing surface 22 are connected by an annular end surface 23 .
- Sealing element 16 can be in the form of four coils of a rope-type packing is positioned between sealing surface 22 and lateral surface 26 of ceramic membrane 2 and against annular end surface 23 .
- the rope-type packing of sealing element 16 can be formed of an aluminosilicate fiber or a zirconia fiber.
- sealing element 16 can be a rope-like material having a diameter of about 1.59 mm and formed of plied and twisted filaments of alumina-boriasilicate.
- filaments are sold commercially as NEXTEL 312 ceramic fibers as a product of 3M Ceramics Materials Department, 3M Center, St. Paul, Minn., 55144, United States.
- the particular rope-like material, described above, can be obtained in finished form from Coltronics Corp., Brooklyn, N.Y., United States, as item# CT301.
- sealing element 16 can be formed of a paper or felt stuffing of the ceramic material. Ceramic minerals are also possible such as vermiculite.
- the sealing efficiency of any of the ceramic materials mentioned above can be enhanced by infiltrating the fibers with a particulate such as a refractory ceramic (e.g. Al 2 O 3 , ZrO 2 , MgO and etc.), or a powder of ceramic material used in fabricating ceramic membrane 2 , or possibly a metal such as gold.
- a particulate such as a refractory ceramic (e.g. Al 2 O 3 , ZrO 2 , MgO and etc.), or a powder of ceramic material used in fabricating ceramic membrane 2 , or possibly a metal such as gold.
- the particulate material can be applied by dipping or spraying a slurry.
- Follower 12 is provided with a fusto-conical end element 30 that fits within the tapered section of passageway 18 .
- End element 30 bears against sealing element 16 in a direction taken towards narrow end section 20 by action of threaded engagement 17 .
- This action drives sealing element 16 against sealing surface 22 , lateral surface 26 of ceramic membrane 2 , and annular end surface 23 , thereby to compress sealing element 16 .
- a seal is effectuated between fixture 10 and ceramic membrane 2 and therefore also tube sheet 3 due to the connection of fixture 10 and tube sheet 3 .
- a strong frictional engagement is produced to hold ceramic membrane 2 in place.
- FIG. 3 illustrates a joint assembly 1 ′ that is used to join a ceramic membrane 2 ′ to a tube sheet such as that designated by reference numeral 3 .
- Joint assembly 1 ′ includes a fixture 32 that is connected to the tube sheet 3 .
- Fixture 32 is provided with a passageway 33 having a tapered section to form a sealing surface 34 surrounding and located adjacent to a narrow end section 36 of passageway 33 .
- ceramic membrane 2 ′ projects from narrow end section 36 of passageway 33 .
- Ceramic membrane 2 ′ is provided with an enlarged end portion 40 located at an open end 38 thereof, that is outwardly flared to produce an outwardly flared lateral surface 41 .
- lateral surface 41 of ceramic membrane 2 ′ is surrounded by sealing surface 34 .
- a sealing element 42 in the form of a cone seal gasket fits between sealing surface 34 and lateral surface 41 of ceramic membrane 2 ′.
- An optional, annular butt seal gasket 45 is positioned between a follower 44 extended into passageway 33 of fixture 32 and in alignment an internal bore 46 of a passageway for the flow of a permeate through fixture 33 .
- Sealing element 42 and annular butt seal gasket 45 can be fabricated from a ceramic fiber paper (formed from the same materials set forth above). Although not illustrated, sealing element 42 and annular butt seal gasket 45 could be replaced by a wound rope-like seal as illustrated for sealing element 16 .
- follower 44 and fixture 32 can be provided with a threaded engagement in the same manner as threaded engagement 17 of fixture 10 and follower 12 .
- follower 44 is provided with a cylindrical end element 47 to bear against annular butt seal gasket 45 when follower 44 is driven within fixture 32 by such threaded engagement. This acts to provide a seal between bore 46 and open end 38 of ceramic membrane 2 ′. Furthermore, such action in turn forces lateral surface 41 of ceramic membrane 2 ′ against sealing element 42 and sealing surface 34 . As a result, sealing element 42 is compressed to seal ceramic membrane 2 ′ within fixture 32 and therefore also with respect to the tube sheet. At the same time, ceramic membrane 2 ′ is held in place due to the force exerted by follower 44 .
- fixture 32 can optionally be provided with an enlarged bore 46 adjacent to inner tapered sealing surface 34 and an inlet port 48 in communication with bore 34 to allow introduction of an inert buffer gas to prevent leakage from the sealing arrangement described above.
- Fixture 10 could be provided with a similar arrangement.
- FIG. 4 is an alternative embodiment illustrating a joint assembly 1 ′′ that is used to join a ceramic membrane 2 ′′ to tube sheet 3 .
- Joint assembly 1 ′′ is provided with a fixture 50 connected to tube sheet 3 .
- a ceramic membrane 2 ′′ is fabrication with an enlarged end portion 52 located at an open end 53 thereof. Enlarged end portion 52 fits within fixture 50 with the remainder of ceramic membrane 2 ′′ projecting from fixture 50 .
- a follower 54 by a threaded connection bears against enlarged end portion 52 .
- Fixture 50 includes a passageway 56 having a narrow end section 58 , and an annular end surface 60 surrounding and adjacent to the narrow section 58 of passageway 56 .
- Enlarged end portion 52 has a fusto-conical configuration to provide a cone-shaped lateral surface 62 and an annular undersurface 64 that is located opposite to the annular end surface 60 when ceramic membrane 2 ′′ is received within fixture 50 .
- Follower 54 has an end section 66 to bear against enlarged end portion 52 .
- End section 66 has a cavity 68 also of fusto-conical configuration to receive enlarged end portion 52 of the ceramic membrane 2 ′′. Cavity 68 is in communication with one end of a bore 70 serving as an inner passage for permeate to flow through follower 54 .
- a sealing element 72 in the form of annular butt seal gasket is located between annular undersurface 64 and annular end surface 60 to seal ceramic membrane 2 ′′ within fixture 50 when follower 54 is driven towards narrow end section 56 and therefore annular end surface 60 .
- a cone seal gasket 74 can optionally be provided to seal enlarged end portion 52 within cavity 68 .
- an annular butt seal gasket 76 located between open end 53 of ceramic membrane 2 ′′ and follower 50 and in alignment with bore 70 , can optionally be provided to seal bore 70 to open end 53 of ceramic membrane 2 ′′.
- a sealing element 16 ′ in place of a sealing element 16 for joint assembly 1 , a sealing element 16 ′ can be provided that consists of two coils 80 and 82 of a rope-type packing and a layer of a mineral or graphite packing 84 .
- a sealing element 16 ′′ can be provided in place of sealing element 16 that consists of two coils 86 and 88 of a rope-type packing sandwiching a mineral or graphite packing 90 .
- any sealing element used to effectuate a seal in the extreme environment contemplated by the present invention must be designed to retain its shape within a temperature range of between about 700° C. and about 1200° C. It is important that the seal be able to withstand an oxygen partial pressure within a pressure range of between about 10 ⁇ 18 atmospheres and about 3 atmosphere. Further, any such sealing element should additionally be able to withstand an absolute pressure within the pressure range of between about 1 atmospheres and about 70 atmospheres.
- fixture 10 could be modified by continuing passageway 18 to narrow end section 20 with a constant diameter.
- the fixture would not have a tapered sealing surface 22 nor would follower 12 have a fusto-conical end element 30 .
- a sealing element such as a rope seal could be compressed against the base of such modified bore to cause an outward deformation of the sealing element.
- the outward deformation surfaces of the sealing element would bear against both fixture and ceramic membrane to effect a seal with a frictional engagement to hold the membrane in place.
- joint assembly 1 ′′ is also possible though use of a fixture having a bore of constant diameter, as has been discussed above.
- enlarged end portion 52 would be given a cylindrical configuration and rope-like packing elements might be provided both between the lateral surface of the enlarged end portion and the passageway of the fixture and between the undersurface of such enlarged end portion and the annular end surface of the passageway.
- a cylindrical cavity at the end of the follower would at once receive the enlarged end portion, bear against packing elements located between the enlarged end portion and the surface of the passageway and also bear against the end section of the ceramic membrane to compress the packing element located between its undersurface and the annular end surface of the passageway.
- Such embodiment would have elements of either joint assemblies 1 and 1 ′′.
- the claims therefore are meant to cover such an embodiment.
- a further possible modification to the illustrated preferred embodiments as has been discussed with reference to either joint assembly 1 , joint assembly 1 ′ or joint assembly 1 ′′′ is to use locking pins in place of a threaded engagement such that designated by reference numeral 17 .
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Abstract
Description
- This is a continuation in part of U.S. Ser. No. 09/534,998, now abandoned.
- The present invention relates to a joint assembly for joining a ceramic membrane of tubular form to a tube sheet used in supporting the ceramic membrane within a reactor. More particularly, the present invention relates to such a joint assembly in which the ceramic membrane is received and sealed within a fixture connected to the tube sheet.
- Ceramic membranes are used to separate a gaseous component from a mixture, for instance, oxygen from air. Ceramic membranes are gas tight and function by allowing ions to selectively migrate through the membrane. The disassociation and ionization of the selected gas occurs at a membrane surface where electrons are picked up from near surface electronic states. The flux of the ions is charged compensated by a simultaneous flux of electronic charge carriers through the ceramic membrane. When the ions arrive at the opposite side of the membrane, the individual ions release their electrons and recombine to form gas molecules. The driving force for such transport can be a differential partial pressure of the selected gas applied across the membrane or an external source of electric power.
- Ceramic membranes can be employed in the form of tubes located within reactors. Critical to the success of the reactor is both the survival of such ceramic membranes and adequate sealing at a location where the tubular ceramic element is joined with the reactor, generally at a tube sheet. Since ceramic membranes exhibit ion conductivity at temperatures that are well above 500° C., generally in the range of between about 600° C. and about 1000° C. the joint assembly and seal between the ceramic membrane and the tube sheet are subjected to extreme environmental conditions.
- A major obstacle in developing a viable seal are the unique thermomechanical properties of ceramic materials, e.g. high thermal expansion and compositional dilation and the high operational temperatures of the membranes. Both factors prohibit the use of common fixed joining techniques such as glass sealing or brazing. Instead, joining techniques that do not rigidly affix the ceramic within the reactor are used such as non-bonding, compression type joint assembles. For instance, both U.S. Pat. No. 5,820,654 and U.S. Pat. No. 5,820,655 use either a sliding or fixed seal with a bellows at the juncture of the ceramic membrane and the tube sheet.
- The prior art has provided high temperature seals that are used to seal structural panels. For instance, U.S. Pat. No. 4,917,302 utilizes a stack of ceramic wafers located within a rectangular groove along the side of a movable engine panel. The engine panel is sealed to an adjacent side wall by the ceramic wafers which are held in position by a pressurized linear bellows that also fits within the groove. U.S. Pat. No. 5,082,293 shows a similar seal except that the sealing element instead of consisting of a stack of wafers is made up of multiple layers of a fiber wound about a core. The materials for such fibers can be alumina-boriasilicate or silicon-carbide. U.S. Pat. No. 5,301,595 discloses a rope seal having a core of ceramic fibers and a cover of stainless steel. The rope seal is designed to seat within a groove in one component and bear against a flat wall of another component. U.S. Pat. No. 4,394,023 shows a high temperature valve stem packing that incorporates graphite seal rings composed of coiled graphite tape held between metal packing adapter rings that bear against the graphite seal rings.
- All of the foregoing materials are attractive for sealing a ceramic membrane to a tube sheet due to their high temperature performance. As will be discussed, the present invention provides a joint assembly that is designed to advantageously utilize high temperature sealing materials, such as those identified above and to hold the ceramic membrane in place.
- The present invention provides a joint assembly for joining a ceramic membrane of tubular configuration to a tube sheet. The joint assembly has a fixture connected to the tube sheet and including a passageway having a narrow end section, located at one end of the passageway, to receive the ceramic membrane. A sealing surface, defined by the passageway, is located at the one end thereof. The ceramic membrane extends through the narrow end section of the passageway so that an open end of the ceramic membrane is located within the passageway and an adjacent lateral surface of the membrane is surrounded by the sealing surface. At least one sealing element is located between the sealing surface and the lateral surface of the ceramic membrane. A follower is located within the passageway and bears against the at least one sealing element in a direction towards the narrow end section of the passageway. This action simultaneously drives the at least one sealing element against the sealing surface and the lateral surface of the ceramic membrane by compression of the at least one sealing element. As a result, a seal is effected between the fixture and the ceramic membrane and the ceramic membrane is held in place by frictional forces developed between the at least one sealing element and the ceramic membrane. The follower is provided with an inner passage in communication with the open end of the ceramic membrane to allow permeate or feed to flow through the follower.
- The sealing surface can be formed by a tapered section of said passageway, tapering towards the narrow end section. In such case, the passageway is also provided with an annular end surface connecting the tapered section of said passageway with the narrow end section. The follower has a fusto-conical end element configured to fit within said tapered section of said passageway and to bear against said at least one sealing element.
- In a further aspect of the present invention the fixture bears against the ceramic membrane to compress the at least one sealing element. In this aspect of the present invention, the fixture of the joint assembly includes a passageway having a narrow end section, located at one end of the passageway. A sealing surface surrounds and is located adjacent to the narrow end section. The ceramic membrane has an enlarged end portion at an open end thereof. The enlarged end portion is located within the passageway with the ceramic membrane extending from the narrow end section of the passageway. At least one sealing element is located between the sealing surface and the enlarged end portion of the ceramic membrane and a follower, located within the passageway, bears against the enlarged end portion of the ceramic membrane in a direction towards the narrow end section of the passageway. This action compresses the at least one sealing element between the sealing surface and the enlarged end portion of the ceramic membrane. As a result, a seal is effected between the fixture and the ceramic membrane and the ceramic membrane is held in place, against the sealing surface. The follower is provided with an inner passage in communication with the open end of the ceramic membrane to allow feed or permeate to flow through the follower.
- The enlarged end portion of the ceramic membrane can be formed by an outwardly flared portion of the ceramic membrane to produce an outwardly flared lateral surface thereof. In such embodiment of the invention, the sealing surface is formed by a tapered section of the passageway, tapering towards the narrow end section. The at least one sealing element is a cone seal gasket located between said outwardly flared lateral surface and said sealing surface. An annular butt seal gasket is located between the follower and the open end of said ceramic membrane in alignment with the inner passageway of the follower.
- In yet another alternative embodiment the sealing surface is an annular end surface of the passageway surrounding the narrow end section thereof. The enlarged end portion has an annular undersurface located opposite to the annular end surface and the at least one sealing element comprises a annular butt seal gasket located between said annular undersurface and said annular end surface. The follower also has an end section having a cavity configured to receive the enlarged end portion of said ceramic membrane. In such embodiment, the enlarged end portion of the ceramic membrane and the cavity can be of fusto-connical configuration. In such case, a cone-seal gasket is located between the enlarged end portion and the cavity. A butt seal gasket is located between the open end of the ceramic membrane and the follower, in alignment with the passage thereof.
- The at least one sealing element can be formed of a rope-like packing wound around the lateral surface of the ceramic membrane. Alternatively, the at least one sealing element can be formed of a paper or felt stuffing of the ceramic material. The ceramic material can be an aluminosilicate fiber or a zirconia fiber. Advantageously, the ceramic material can be infiltrated with a particulate material and preferably such particulate material can be a ceramic or a metal. The sealing element can generally be formed of a ceramic mineral such as vermiculite. The at least one sealing element can also be formed of a layer of a ceramic powder or a graphite packing.
- In any embodiment of the present invention, the fixture can be provided with an inlet port for introduction of a buffer gas into the fixture.
- While the specification concludes with claims distinctly pointing out the subject matter that Applicants regard as their invention, it is believed that the invention will be better understood when taken in connection with the accompanying drawings in which:
- FIG. 1 is a schematic view of a joint assembly in accordance with the present invention;
- FIG. 2 is an enlarged fragmentary view of an embodiment of the joint assembly shown in FIG. 1;
- FIG. 3 is an enlarged fragmentary view of an alternative embodiment of the joint assembly shown in FIG. 1;
- FIG. 4 is a schematic view of an alternative embodiment of a joint assembly in accordance with the present invention.
- FIG. 5 is an enlarged fragmentary view of an alternative embodiment of sealing elements used in the embodiment shown in FIG. 2; and
- FIG. 6 is an enlarged fragmentary view of an alternative embodiment of sealing elements used in the embodiment shown in FIG. 2.
- With reference to FIG. 1, a joint assembly1 is illustrated for sealing in open end of a
ceramic membrane 2 of tubular configuration to atube sheet 3. Joint assembly 1 includes afixture 10 connected totube sheet 3 and afollower 12 having a hex-like head 13. -
Follower 12 and its hex-like head 13 are provided withinternal bores follower 12 and therefore joint assembly 1.Follower 12 fits within thefixture 10 with a threadedengagement 17 to exert pressure against a sealingelement 16. In this regard, hex-like head 13 offollower 12 facilitates the threading offollower 12 intofixture 10. - It is to be noted that
fixture 10 andfollower 12 can be fabricated from HAYNES 230 alloy. HAYNES 214 and INCOLOY 800 are other possible materials. - With additional reference to FIG. 2,
fixture 10 is provided with apassageway 18 having anarrow end section 20 located at one end ofpassageway 18. A sealingsurface 22 is formed by an inner tapered section of apassageway 18 that tapers towardsnarrow end section 20.Narrow end section 20 and innertapered sealing surface 22 are connected by anannular end surface 23. When anopen end 24 ofceramic membrane 2 is received withinnarrow end section 20, an adjacentlateral surface 26 ofceramic membrane 2 is surrounded by sealingsurface 22. - Sealing
element 16 can be in the form of four coils of a rope-type packing is positioned between sealingsurface 22 andlateral surface 26 ofceramic membrane 2 and againstannular end surface 23. - The rope-type packing of sealing
element 16 can be formed of an aluminosilicate fiber or a zirconia fiber. In this regard, sealingelement 16 can be a rope-like material having a diameter of about 1.59 mm and formed of plied and twisted filaments of alumina-boriasilicate. Such filaments are sold commercially as NEXTEL 312 ceramic fibers as a product of 3M Ceramics Materials Department, 3M Center, St. Paul, Minn., 55144, United States. The particular rope-like material, described above, can be obtained in finished form from Coltronics Corp., Brooklyn, N.Y., United States, as item# CT301. - In addition to rope-like packings, sealing
element 16 can be formed of a paper or felt stuffing of the ceramic material. Ceramic minerals are also possible such as vermiculite. - The sealing efficiency of any of the ceramic materials mentioned above can be enhanced by infiltrating the fibers with a particulate such as a refractory ceramic (e.g. Al2O3, ZrO2, MgO and etc.), or a powder of ceramic material used in fabricating
ceramic membrane 2, or possibly a metal such as gold. The particulate material can be applied by dipping or spraying a slurry. -
Follower 12 is provided with a fusto-conical end element 30 that fits within the tapered section ofpassageway 18.End element 30 bears against sealingelement 16 in a direction taken towardsnarrow end section 20 by action of threadedengagement 17. This action drives sealingelement 16 against sealingsurface 22,lateral surface 26 ofceramic membrane 2, andannular end surface 23, thereby to compress sealingelement 16. As a result, a seal is effectuated betweenfixture 10 andceramic membrane 2 and therefore alsotube sheet 3 due to the connection offixture 10 andtube sheet 3. At the same time a strong frictional engagement is produced to holdceramic membrane 2 in place. - Good sealing results were obtained for a ceramic membrane having an outer diameter of about 1.27 cm. and with a sealing
element 16 as has been specifically described above and illustrated in FIG. 1. Such results were obtained with sealingsurface 22 having a length of about 1.9 cm.(as measured along the side of fixture 10) and a taper of about 3 degrees.Annular end surface 23 had a width, as measured along a radius thereof, of about 1.02 mm. When joint assembly 1 was completely assembled, sealingelement 16 was compressed to a length (as measured along the side of fixture 10) of about 9.53 mm. - FIG. 3 illustrates a joint assembly1′ that is used to join a
ceramic membrane 2′ to a tube sheet such as that designated byreference numeral 3. Joint assembly 1′ includes afixture 32 that is connected to thetube sheet 3.Fixture 32 is provided with apassageway 33 having a tapered section to form a sealingsurface 34 surrounding and located adjacent to anarrow end section 36 ofpassageway 33. As illustrated,ceramic membrane 2′ projects fromnarrow end section 36 ofpassageway 33.Ceramic membrane 2′ is provided with an enlarged end portion 40 located at anopen end 38 thereof, that is outwardly flared to produce an outwardly flaredlateral surface 41. Whenceramic membrane 2′ is positioned withinnarrow end section 36,lateral surface 41 ofceramic membrane 2′ is surrounded by sealingsurface 34. - A sealing
element 42 in the form of a cone seal gasket fits between sealingsurface 34 andlateral surface 41 ofceramic membrane 2′. An optional, annularbutt seal gasket 45 is positioned between afollower 44 extended intopassageway 33 offixture 32 and in alignment aninternal bore 46 of a passageway for the flow of a permeate throughfixture 33. Sealingelement 42 and annularbutt seal gasket 45 can be fabricated from a ceramic fiber paper (formed from the same materials set forth above). Although not illustrated, sealingelement 42 and annularbutt seal gasket 45 could be replaced by a wound rope-like seal as illustrated for sealingelement 16. - Although not illustrated,
follower 44 andfixture 32 can be provided with a threaded engagement in the same manner as threadedengagement 17 offixture 10 andfollower 12.Follower 44 is provided with acylindrical end element 47 to bear against annularbutt seal gasket 45 whenfollower 44 is driven withinfixture 32 by such threaded engagement. This acts to provide a seal betweenbore 46 andopen end 38 ofceramic membrane 2′. Furthermore, such action in turn forceslateral surface 41 ofceramic membrane 2′ against sealingelement 42 and sealingsurface 34. As a result, sealingelement 42 is compressed to sealceramic membrane 2′ withinfixture 32 and therefore also with respect to the tube sheet. At the same time,ceramic membrane 2′ is held in place due to the force exerted byfollower 44. - It is to be noted that in many applications, a seal produced by a joint assembly in accordance with the present invention will produce some leakage of a permeate such as oxygen. In order to prevent leakage,
fixture 32 can optionally be provided with anenlarged bore 46 adjacent to innertapered sealing surface 34 and aninlet port 48 in communication withbore 34 to allow introduction of an inert buffer gas to prevent leakage from the sealing arrangement described above.Fixture 10 could be provided with a similar arrangement. - With reference to FIG. 4, is an alternative embodiment illustrating a joint assembly1″ that is used to join a
ceramic membrane 2″ totube sheet 3. Joint assembly 1″ is provided with afixture 50 connected totube sheet 3. Aceramic membrane 2″ is fabrication with anenlarged end portion 52 located at anopen end 53 thereof.Enlarged end portion 52 fits withinfixture 50 with the remainder ofceramic membrane 2″ projecting fromfixture 50. Afollower 54 by a threaded connection (not shown but as in other embodiments) bears againstenlarged end portion 52. -
Fixture 50 includes apassageway 56 having anarrow end section 58, and anannular end surface 60 surrounding and adjacent to thenarrow section 58 ofpassageway 56.Enlarged end portion 52 has a fusto-conical configuration to provide a cone-shapedlateral surface 62 and anannular undersurface 64 that is located opposite to theannular end surface 60 whenceramic membrane 2″ is received withinfixture 50.Follower 54 has anend section 66 to bear againstenlarged end portion 52.End section 66 has acavity 68 also of fusto-conical configuration to receiveenlarged end portion 52 of theceramic membrane 2″.Cavity 68 is in communication with one end of abore 70 serving as an inner passage for permeate to flow throughfollower 54. - A sealing
element 72 in the form of annular butt seal gasket is located betweenannular undersurface 64 andannular end surface 60 to sealceramic membrane 2″ withinfixture 50 whenfollower 54 is driven towardsnarrow end section 56 and thereforeannular end surface 60. Acone seal gasket 74 can optionally be provided to sealenlarged end portion 52 withincavity 68. Furthermore, an annularbutt seal gasket 76, located betweenopen end 53 ofceramic membrane 2″ andfollower 50 and in alignment withbore 70, can optionally be provided to seal bore 70 to openend 53 ofceramic membrane 2″. - With reference to FIG. 5, in place of a sealing
element 16 for joint assembly 1, a sealingelement 16′ can be provided that consists of twocoils element 16″ can be provided in place of sealingelement 16 that consists of twocoils - Other types of sealing elements are possible. However, any sealing element used to effectuate a seal in the extreme environment contemplated by the present invention must be designed to retain its shape within a temperature range of between about 700° C. and about 1200° C. It is important that the seal be able to withstand an oxygen partial pressure within a pressure range of between about 10−18 atmospheres and about 3 atmosphere. Further, any such sealing element should additionally be able to withstand an absolute pressure within the pressure range of between about 1 atmospheres and about 70 atmospheres.
- Other types of fixtures in accordance with the present invention are possible. For instance,
fixture 10 could be modified by continuingpassageway 18 tonarrow end section 20 with a constant diameter. As a result, the fixture would not have a tapered sealingsurface 22 nor wouldfollower 12 have a fusto-conical end element 30. Through action of a threaded engagement between the follower and the fixture, a sealing element such as a rope seal could be compressed against the base of such modified bore to cause an outward deformation of the sealing element. The outward deformation surfaces of the sealing element would bear against both fixture and ceramic membrane to effect a seal with a frictional engagement to hold the membrane in place. - A modification to joint assembly1″ is also possible though use of a fixture having a bore of constant diameter, as has been discussed above. In such modification,
enlarged end portion 52 would be given a cylindrical configuration and rope-like packing elements might be provided both between the lateral surface of the enlarged end portion and the passageway of the fixture and between the undersurface of such enlarged end portion and the annular end surface of the passageway. A cylindrical cavity at the end of the follower would at once receive the enlarged end portion, bear against packing elements located between the enlarged end portion and the surface of the passageway and also bear against the end section of the ceramic membrane to compress the packing element located between its undersurface and the annular end surface of the passageway. Thus, such embodiment would have elements of either joint assemblies 1 and 1″. The claims therefore are meant to cover such an embodiment. - A further possible modification to the illustrated preferred embodiments as has been discussed with reference to either joint assembly1, joint assembly 1′ or joint assembly 1′″ is to use locking pins in place of a threaded engagement such that designated by
reference numeral 17. - While the invention has been described with reference to a preferred embodiment, as will occur to those skilled in the art, numerous changes, additions and omissions can be made without departing from the spirit and the scope of the present invention.
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/809,389 US6454274B2 (en) | 2000-03-27 | 2001-03-15 | Joint assembly for joining a ceramic membrane to a tube sheet |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US53499800A | 2000-03-27 | 2000-03-27 | |
US09/809,389 US6454274B2 (en) | 2000-03-27 | 2001-03-15 | Joint assembly for joining a ceramic membrane to a tube sheet |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US53499800A Continuation-In-Part | 2000-03-27 | 2000-03-27 |
Publications (2)
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US20010033060A1 true US20010033060A1 (en) | 2001-10-25 |
US6454274B2 US6454274B2 (en) | 2002-09-24 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/809,389 Expired - Lifetime US6454274B2 (en) | 2000-03-27 | 2001-03-15 | Joint assembly for joining a ceramic membrane to a tube sheet |
Country Status (12)
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US (1) | US6454274B2 (en) |
EP (1) | EP1269046A1 (en) |
JP (1) | JP3688642B2 (en) |
KR (1) | KR20020091150A (en) |
CN (1) | CN1432113A (en) |
AU (1) | AU2001247515A1 (en) |
BR (1) | BR0109527A (en) |
CA (1) | CA2404217A1 (en) |
MX (1) | MXPA02009406A (en) |
RU (1) | RU2275537C2 (en) |
WO (1) | WO2001073324A1 (en) |
ZA (1) | ZA200207753B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2141268A1 (en) | 2008-06-30 | 2010-01-06 | L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Hollow organic/inorganic composite fibers, sintered fibers, methods of making such fibers, gas separation modules incorporating such fibers, and methods of using such modules |
US20100018394A1 (en) * | 2008-06-30 | 2010-01-28 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Hollow Organic/Inorganic Composite Fibers, Sintered Fibers, Methods of Making Such Fibers, Gas Separation Modules Incorporating Such Fibers, and Methods of Using Such Modules |
US20160377178A1 (en) * | 2015-06-25 | 2016-12-29 | Evolution Engineering Inc. | Method for sealing a gap sub assembly |
EP3130397A1 (en) * | 2015-08-12 | 2017-02-15 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Reforming tube with protection part against corrosion |
Families Citing this family (11)
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JP3933907B2 (en) * | 2001-10-23 | 2007-06-20 | 日本碍子株式会社 | Gas separator fixing structure and gas separator using the same |
US6547286B1 (en) * | 2001-12-27 | 2003-04-15 | Praxair Technology, Inc. | Joint for connecting ceramic element to a tubesheet |
FR2852654B1 (en) | 2003-03-20 | 2005-05-06 | DEVICE AND METHOD FOR RELATIVE AND CONTROLLED SEALING BETWEEN A CONDUIT AND A CERAMIC TUBE | |
US7217566B2 (en) * | 2003-03-24 | 2007-05-15 | Invitrogen Corporation | Attached cell lines |
US20050200124A1 (en) * | 2004-03-12 | 2005-09-15 | Kleefisch Mark S. | High temperature joints for dissimilar materials |
US20080260455A1 (en) * | 2007-04-17 | 2008-10-23 | Air Products And Chemicals, Inc. | Composite Seal |
FR2987878B1 (en) | 2012-03-12 | 2014-05-09 | Air Liquide | NEW CERAMIC / METAL JOINT AND METHOD FOR PRODUCING THE SAME |
WO2017185033A1 (en) | 2016-04-22 | 2017-10-26 | Nanostone Water Us | Ceramic membrane module with drive plate and related methods |
CN108793332A (en) * | 2018-06-13 | 2018-11-13 | 安徽海沃特水务股份有限公司 | A kind of ceramic membrane tubular type impurities in water removal device |
CN109464914B (en) * | 2018-12-19 | 2024-03-01 | 浙江中诚环境研究院有限公司 | Flat ceramic membrane sealing head sleeve |
RU203335U1 (en) * | 2020-12-14 | 2021-03-31 | Общество С Ограниченной Ответственностью "Айсберг" | Flat oval finned radiator tube |
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US4394023A (en) | 1982-09-29 | 1983-07-19 | Daniel Industries Inc. | High temperature valve stem packing with coiled graphite seal rings |
US4784743A (en) * | 1984-12-06 | 1988-11-15 | Ngk Insulators, Ltd. | Oxygen sensor |
US4917302A (en) | 1988-12-30 | 1990-04-17 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | High temperature flexible seal |
US5082293A (en) | 1990-11-09 | 1992-01-21 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | High temperature, flexible, fiber-preform seal |
DE4213857C2 (en) * | 1992-04-27 | 1995-10-19 | Endress Hauser Gmbh Co | Device for measuring pressure and differential pressure |
US5301595A (en) | 1992-06-25 | 1994-04-12 | General Motors Corporation | High temperature rope seal type joint packing |
US5700373A (en) * | 1992-09-17 | 1997-12-23 | Coors Ceramics Company | Method for sealing a filter |
RU2117281C1 (en) * | 1994-12-15 | 1998-08-10 | Семен Борисович Ицыгин | General-purpose integral ion-selection transducer |
US5820654A (en) | 1997-04-29 | 1998-10-13 | Praxair Technology, Inc. | Integrated solid electrolyte ionic conductor separator-cooler |
US5820655A (en) | 1997-04-29 | 1998-10-13 | Praxair Technology, Inc. | Solid Electrolyte ionic conductor reactor design |
US5902363A (en) * | 1997-07-18 | 1999-05-11 | Alliedsignal Composites Inc. | Ceramic hot-gas filter |
-
2001
- 2001-03-15 US US09/809,389 patent/US6454274B2/en not_active Expired - Lifetime
- 2001-03-19 WO PCT/US2001/008556 patent/WO2001073324A1/en active IP Right Grant
- 2001-03-19 CN CN01810243A patent/CN1432113A/en active Pending
- 2001-03-19 AU AU2001247515A patent/AU2001247515A1/en not_active Abandoned
- 2001-03-19 KR KR1020027012530A patent/KR20020091150A/en active IP Right Grant
- 2001-03-19 JP JP2001571011A patent/JP3688642B2/en not_active Expired - Fee Related
- 2001-03-19 RU RU2002128730/06A patent/RU2275537C2/en not_active IP Right Cessation
- 2001-03-19 CA CA002404217A patent/CA2404217A1/en not_active Abandoned
- 2001-03-19 EP EP01920468A patent/EP1269046A1/en not_active Withdrawn
- 2001-03-19 MX MXPA02009406A patent/MXPA02009406A/en not_active Application Discontinuation
- 2001-03-19 BR BR0109527-7A patent/BR0109527A/en not_active IP Right Cessation
-
2002
- 2002-09-26 ZA ZA200207753A patent/ZA200207753B/en unknown
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2141268A1 (en) | 2008-06-30 | 2010-01-06 | L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Hollow organic/inorganic composite fibers, sintered fibers, methods of making such fibers, gas separation modules incorporating such fibers, and methods of using such modules |
US20100018394A1 (en) * | 2008-06-30 | 2010-01-28 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Hollow Organic/Inorganic Composite Fibers, Sintered Fibers, Methods of Making Such Fibers, Gas Separation Modules Incorporating Such Fibers, and Methods of Using Such Modules |
US8268041B2 (en) | 2008-06-30 | 2012-09-18 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Hollow organic/inorganic composite fibers, sintered fibers, methods of making such fibers, gas separation modules incorporating such fibers, and methods of using such modules |
US20160377178A1 (en) * | 2015-06-25 | 2016-12-29 | Evolution Engineering Inc. | Method for sealing a gap sub assembly |
US10295060B2 (en) * | 2015-06-25 | 2019-05-21 | Evolution Engineering Inc. | Method for sealing a gap sub assembly |
EP3130397A1 (en) * | 2015-08-12 | 2017-02-15 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Reforming tube with protection part against corrosion |
WO2017025587A1 (en) * | 2015-08-12 | 2017-02-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Reforming tube comprising an insert affording protection against corrosion |
US10421057B2 (en) | 2015-08-12 | 2019-09-24 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Reforming tube comprising an insert affording protection against corrosion |
Also Published As
Publication number | Publication date |
---|---|
MXPA02009406A (en) | 2004-05-17 |
RU2275537C2 (en) | 2006-04-27 |
CN1432113A (en) | 2003-07-23 |
WO2001073324A1 (en) | 2001-10-04 |
AU2001247515A1 (en) | 2001-10-08 |
CA2404217A1 (en) | 2001-10-04 |
JP2003528719A (en) | 2003-09-30 |
EP1269046A1 (en) | 2003-01-02 |
BR0109527A (en) | 2002-12-10 |
KR20020091150A (en) | 2002-12-05 |
ZA200207753B (en) | 2003-11-06 |
US6454274B2 (en) | 2002-09-24 |
JP3688642B2 (en) | 2005-08-31 |
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