WO2004069451A1 - Device for connecting a fluid circulating line to a refractory element and refractory element - Google Patents

Device for connecting a fluid circulating line to a refractory element and refractory element Download PDF

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Publication number
WO2004069451A1
WO2004069451A1 PCT/BE2004/000018 BE2004000018W WO2004069451A1 WO 2004069451 A1 WO2004069451 A1 WO 2004069451A1 BE 2004000018 W BE2004000018 W BE 2004000018W WO 2004069451 A1 WO2004069451 A1 WO 2004069451A1
Authority
WO
WIPO (PCT)
Prior art keywords
gasket
bore
rod
supporting
refractory
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.)
Ceased
Application number
PCT/BE2004/000018
Other languages
French (fr)
Inventor
François-Noël RICHARD
Aldo Ruffaldi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vesuvius Crucible Co
Original Assignee
Vesuvius Crucible Co
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 Vesuvius Crucible Co filed Critical Vesuvius Crucible Co
Priority to JP2006501388A priority Critical patent/JP4705012B2/en
Priority to MXPA05008365A priority patent/MXPA05008365A/en
Priority to CA2514827A priority patent/CA2514827C/en
Priority to DE602004001133T priority patent/DE602004001133T2/en
Priority to BR0406771-1A priority patent/BRPI0406771A/en
Priority to EP04707472A priority patent/EP1594643B1/en
Priority to US10/544,756 priority patent/US7942455B2/en
Priority to AU2004210014A priority patent/AU2004210014B2/en
Priority to UAA200508322A priority patent/UA81653C2/en
Publication of WO2004069451A1 publication Critical patent/WO2004069451A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/502—Connection arrangements; Sealing means therefor
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
    • F16B13/061—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve of the buckling type

Definitions

  • the supporting device has large dimensions so that its thermal expansion causes a substantial increase of the distance left for the gasket between the seat and said supporting element, this imposes to have elastic means relatively voluminous with respect to the size of the gasket to compensate this increase and maintain a sufficient pressure on the gasket.
  • the document WO-A1 -01/83138 proposes to limit this drawback by the insertion of an intermediate metallic element whose expansion can compensate the expansion of the supporting element.
  • the gasket remains permanently in contact with the seat and allows to keep a good tightness despite the temperature changes.
  • the upper end of the metallic element must however also be blocked, for example with a weld making it integral with the band.
  • a gasket made from an elastic refractory material for example graphite, is used.
  • a spacing washer for example made from refractory material or steel, can also be juxtaposed to the gasket on the side of the first supporting element to prevent the gasket extending radially to apply a radial effort too close to the edges of the bore, which are weaker than the rest of the wall.
  • a flat surface can also be formed in the side wall of the refractory element, around the inlet of the bore, to receive a positioning washer arranged between the first supporting element and the assembly constituted from the gasket and, optionally, the elastic means as well as, optionally, the spacing washer.
  • This positioning washer gives a reference for the introduction of the second supporting element, the gasket and the rod, with respect to the external face of the wall of the refractory element. Further, this positioning washer makes the connection stiffer by resting on the side wall of the refractory element and contributes to bind the fluid line in its most advantageous direction with respect to this wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasket Seals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)

Abstract

The invention relates to a device for connecting a fluid circulating line (6) to a refractory element (1) having a wall provided with a cylindrical bore (5a, 5b), comprising a gasket (14) intended to be located into the bore and a first supporting element (13) compressing the gasket from the outside of the bore. A second supporting element (9b) which can be introduced into the bore sandwiches the gasket (14) together with the first supporting element (13) and a rod (9a) brings the two supporting elements closer so as to compress the gasket. The invention also relates to a refractory element (1), notably a nozzle or a pouring shroud, provided with a cylindrical bore (5) sized to receive two supporting elements (9b, 13) and a tightening gasket (14) sandwiched by these supporting elements.

Description

DEVICE FOR CONNECTING A FLUID CIRCULATING LINE TO A REFRACTORY ELEMENT AND REFRACTORY ELEMENT.
[0001] The invention relates to a device for connecting a fluid circulating line to a refractory element, notably a stopper rod, a nozzle or a pouring shroud, for example to introduce a gas in a pouring channel, to pressurize a chamber, to measure a pressure or to pump a gas. The invention also relates to a refractory element. [0002] A connecting device for a refractory element wherein a seat is provided in the side wall of the element is known from the document FR-A1 -2763012, this device comprises a compressible gasket arranged on the seat, a. supporting element bearing on the external face of the side wall and elastic means inserted between the supporting element and the gasket which push this last against the seat. The supporting element comprises a band or a hoop which circumscribes the refractory element. In both cases, the region of the refractory element located on the opposite side of the seat supports the reaction force required for the compression of the gasket, which is transmitted thereto through the supporting element.
[0003] In such a device, the supporting device has large dimensions so that its thermal expansion causes a substantial increase of the distance left for the gasket between the seat and said supporting element, this imposes to have elastic means relatively voluminous with respect to the size of the gasket to compensate this increase and maintain a sufficient pressure on the gasket. [0004] The document WO-A1 -01/83138 proposes to limit this drawback by the insertion of an intermediate metallic element whose expansion can compensate the expansion of the supporting element. Henceforth, the gasket remains permanently in contact with the seat and allows to keep a good tightness despite the temperature changes. The upper end of the metallic element must however also be blocked, for example with a weld making it integral with the band. [0005] The present invention aims at proposing a simpler and more compact solution wherein it is not necessary to have a band for the refractory element. [0006] The present invention relates to a device for connecting a fluid circulating line to a refractory element having a surface provided with a cylindrical bore, comprising a gasket intended to be located into the bore and a first supporting element compressing the gasket from the outside of the bore. This device is characterized in that it comprises a second supporting element which can be introduced in the bore to sandwich the gasket together with the first supporting element and a rod able to bring closer the two supporting elements so as to compress the gasket. [0007] The two supporting elements exert an axial pressure on the gasket, which causes a radial expansion thereof and its application against the wall of the bore where it is located. The originality of the invention rests in the fact that the compression of the gasket does not require any support on the refractory element since both supporting elements are brought closer to one another around the gasket. Thereby, no other effort than the one resulting from the radial expansion of the gasket is applied on the refractory element. By definition, this radial expansion is well distributed around the bore walls and does not generate stresses able to cause a failure of the refractory element. This advantage is even more marked when the bore has a cross section close to a circle. Therefore, according to an advantageous embodiment of the invention, the bore has a substantially circular cross-section. The shape of the gasket is obviously adapted to the shape of the bore. In any cases, no axial reaction force from the refractory element (whose the resultant is a push of the gasket towards the outside of the bore) is necessary for this compression of the gasket.
[0008] Further, according to the invention, it is not necessary to care particularly for the bottom surface of the bore since, contrarily to the solutions of the state of the art, the tightness of the connection is not ensured at the interface of a gasket with this bottom surface. This feature permits, very advantageously, to realize substantial savings in the production costs of the refractory element. [0009] Consequently, the invention is easy to realize provided the different constituent involved are correctly dimensioned. In particular, the gasket and the second supporting element have preferably dimensions allowing their insertion without effort into the bore. The compression of the gasket ensure then not only the tightness of the connection, but also the attachment of the assembly to the refractory element. In the case of a stopper, one can even think about hanging it with the device of the invention.
[0010] By providing means to link the line to the rod or to the first supporting element, an autonomous device to connect and bind the fluid line to the refractory element is obtained. [0011] Moreover, the gasket, the two supporting elements and the rod form a relatively compact assembly wherein the thermal expansion is reduced, limiting thereby the risk of lowering the axial pressure of the gasket.
[0012] According to a preferred embodiment of the invention, a gasket made from an elastic refractory material, for example graphite, is used.
[0013] In the specific case of a graphite gasket, the inventors have observed that in certain circumstances, the connecting device could fail. Without wishing to be linked in any way to this hypothesis, they have considered that a part of the carbon of the graphite gasket could diffuse into the metallic elements in contact with the gasket (for example the supporting elements) by a phenomenon of diffusion/solution in solid phase. The carbon diffusing towards the metallic elements - comprising generally iron - forms with this last pig-iron whose the melting point is close to 1150°C. When, in use, the temperature is close to this value, the metallic elements "fuse" and are destroyed. This additional problem has been solved by inserting a barrier between the graphite gasket and the metallic elements. Such a barrier can be physical or chemical. For example, the graphite gasket can be coated with a component resisting the high temperatures and which interacts neither with the carbon nor the iron. In particular, metallic oxides such as aluminum oxide or titanium oxide can be used. [0014] According to another embodiment, an elastic means, for example an elastic washer, is juxtaposed to the gasket to compensate the thermal expansion of the rod and the supporting elements.
[0015] According to a particular embodiment of the invention, the rod is a tubular body having a fluid passage canal extending therethrough. This rod can further comprises an outer thread, while at least one of the supporting elements comprises a matching inner thread, the bringing closer of the two supporting elements resulting from a screwing of the supporting element on the rod. In this case, the strength of the compression of the gasket against the bore walls is determined by the tightening couple applied during this screwing. [0016] The rod can be integral with one of the supporting elements, for example the second, which is located into the bore.
[0017] In a particular variant of the embodiment, anti-rotating means are provided to block in rotation the rod introduced into the bore. Such anti-rotating means can consist in flat surfaces formed on the sides of the rod, in a portion thereof which can be reached from the outside of the bore or by an anti-rotating-form cooperating with a matching shape of the bore.
[0018] A spacing washer, for example made from refractory material or steel, can also be juxtaposed to the gasket on the side of the first supporting element to prevent the gasket extending radially to apply a radial effort too close to the edges of the bore, which are weaker than the rest of the wall. [0019] A flat surface can also be formed in the side wall of the refractory element, around the inlet of the bore, to receive a positioning washer arranged between the first supporting element and the assembly constituted from the gasket and, optionally, the elastic means as well as, optionally, the spacing washer. This positioning washer gives a reference for the introduction of the second supporting element, the gasket and the rod, with respect to the external face of the wall of the refractory element. Further, this positioning washer makes the connection stiffer by resting on the side wall of the refractory element and contributes to bind the fluid line in its most advantageous direction with respect to this wall.
[0020] Preferably, the cross-section of the bore is circular. [0021] The invention also relates to a refractory element, notably a nozzle or a pouring shroud, as disclosed hereunder, characterized notably in that it is provided with a cylindrical bore sized to receive two supporting elements and a tightening gasket sandwiched by these supporting elements. [0022] According to particular embodiments :
- a flat surface is formed around the inlet of the bore;
- the bore is provided with an anti-rotating shape to prevent the rotation of one of the supporting elements.
[0023] In order to make easier the understanding of the invention, a particular embodiment, given has a non limiting example, will now be described with reference to the annexed drawings wherein: Fig. 1 is a section view of a nozzle (submerged entry nozzle) used in the casting of molten steel; Fig. 2 is a detailed view of the Fig. 1.
[0024] In the nozzle 1 of Fig. 1 , the steel which flows in the channel 2 is protected from the external atmosphere by a supply of gas, so as to avoid notably the formation and build up of alumina on the inner wall of the channel. A gas conventionally used to this end is argon. [0025] To allow its introduction, the nozzle comprises an annular passageway 3 leading to a sleeve 4 made from a porous material which diffuses the argon at the surface of the channel 2 and forms a protective sheath reducing the contact between the steel and the refractory material. The annular passageway 3 is fed through a bore 5 on which a gas feeding line pipe 6 is connected, itself connected to a gas source 7. [0026] The detail of the region II is shown on Fig. 2, wherein the bore 5 is shown with a connecting device 8 arranged at the end of the pipe 6.
[0027] This device 8 comprises a body which is constituted of a tubular part 9a and a base 9b, both being traversed by a longitudinal canal 9c. The tubular part 9a has a diameter markedly smaller than the bore 5 and leaves around it an annular radial play e, while the base 9b has a diameter which is only slightly smaller tan this of the bore 5.
[0028] The tubular part 9a is threaded and the thread 10 receives an end cap 11 capping the flared end 6a of the pipe 6 and compressing it against a tightening gasket 12 lying on the body end, ensuring thereby a tight connection between the inside of the pipe 6 and the longitudinal canal 9c of the body. The thread also receives a nut 13 which is screwed further near the base 9b. [0029] The base 9b and the nut 13 constitutes 2 supporting elements which sandwich a tightening gasket 14, a spacing washer 15 and a positioning washer 16 which are engaged in this order around the tubular part of the body before screwing of the nut 13. [0030] The tubular part 9a acts as a puller bringing closer the two supporting elements. [0031] The inner diameters of the tightening gasket 14 and of the two washers 15 and 16 correspond substantially to the external diameters of the tubular part 9a.
[0032] The tightening gasket 14 has an external diameter close to this of the bore 5 so that it is forced into this last while the spacing washer 15 has an external diameter close to this of the base 9b and can engages without any friction into the bore 5. [0033] The positioning washer 16 has an external diameter which is markedly larger than the bore 5 so as to bear on the external wall of the nozzle 1 without weakening the edges of the bore 5. [0034] The connecting device 8 can be used in the following manner: after having engaged successively the tightening gasket 14, the spacing washer, the positioning washer 16 and the nut 13 around the tubular part 9a of the body, the nut is screwed up to a position at a distance of the base such that, when the positioning washer 16 rests against the nozzle 1 during the insertion of the body into the bore 5, the base 9b is close to the bottom end 5b of the bore 5.
[0035] The tightening gasket 14 having been slightly forced into the bore, the connecting device is held in position but can still be extracted if a traction is exerted on the pipe 6. [0036] The screwing of the nut 13 is then continued, which causes the move of the body 9 towards the outside of the bore and, thereby, the bringing closer of the base 9b and the nut 13.
[0037] Through the intermediate of the spacing 15 and positioning 16 washers, the gasket 14 is then subjected to an axial pressure which causes its radial expansion. [0038] It is then radially applied against the side wall 5a of the bore around the tubular part 9a carrying thereby, on the one hand, a perfect connection tightness and, on the other hand, the mechanical lock of the device into the bore 5.
[0039] It is clear that the above described embodiment has no limiting purpose.

Claims

Claims
1. Device for connecting a fluid circulating line (6) to a refractory element (1 ) having a surface provided with a cylindrical bore (5), comprising a gasket (14) intended to be located into the bore and a first supporting element (13) compressing the gasket from the outside of the bore, characterized in that it comprises a second supporting element (9b) which can be introduced in the bore to sandwich the gasket (14) together with the first supporting element (13) and a rod (9a) able to bring closer the two supporting elements so as to compress the gasket.
2. Device according to claim 1 , comprising means (11) to link the line (6) to the rod (9a) or to the first supporting element.
3. Device according to claim 1 or 2 wherein the gasket (14) is made from an elastic refractory material, for example graphite.
4. Device according to one of the claims 1 to 3, wherein an elastic means, for example an elastic washer, is juxtaposed to the gasket to compensate the thermal expansions of the rod and the supporting elements.
5. Device according to one of the claims 1 to 4, wherein the rod is a tubular body (9a) having a fluid passage canal (9c) extending therethrough.
6. Device according to claim 5, wherein the rod (9a) comprises an outer thread (10), while at least one (13) of the supporting elements comprises a matching inner thread, the bringing closer of the two supporting elements resulting from a screwing of the supporting element on the rod.
7. Device according to one of the claims 1 to 6, wherein the rod (9a) is integral with one of the supporting elements (9b), for example the second which is located into the bore (5).
8. Device according to claim 7, wherein anti-rotating means are provided to block in rotation the rod introduced into the bore.
9. Device according to one of the claims 1 to 8, wherein a spacing washer (15), for example made from refractory material or steel is juxtaposed to the gasket (14) on the side of the first supporting element (13).
10. Refractory element (1 ), for example nozzle or pouring shroud, characterized in that it comprises a cylindrical bore (5) sized to receive two supporting elements (9b, 13) and a tightening gasket (14) sandwiched by these supporting elements.
11. Refractory element (1 ) according to claim 10, wherein a flat surface is formed around the inlet of the bore (5).
12. Refractory element (1 ) according to one of the claims 10 and 11 , wherein the bore (5) is provided with art anti-rotating shape.
3. Assembly of a refractory element according to one of the claims 10 to 12 with a device according to one of the claims 1 to 9.
PCT/BE2004/000018 2003-02-07 2004-02-03 Device for connecting a fluid circulating line to a refractory element and refractory element Ceased WO2004069451A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP2006501388A JP4705012B2 (en) 2003-02-07 2004-02-03 Device for connecting a fluid circulation line to a refractory element and the refractory element
MXPA05008365A MXPA05008365A (en) 2003-02-07 2004-02-03 Device for connecting a fluid circulating line to a refractory element and refractory element.
CA2514827A CA2514827C (en) 2003-02-07 2004-02-03 Device for connecting a fluid circulating line to a refractory element and refractory element
DE602004001133T DE602004001133T2 (en) 2003-02-07 2004-02-03 DEVICE FOR CONNECTING A FLUID CIRCULATION LINE WITH A FIRE-RESISTANT ELEMENT
BR0406771-1A BRPI0406771A (en) 2003-02-07 2004-02-03 Device for connecting a fluid circulation line to a refractory element and assembly of a refractory element and a device
EP04707472A EP1594643B1 (en) 2003-02-07 2004-02-03 Device for connecting a fluid circulating line to a refractory element
US10/544,756 US7942455B2 (en) 2003-02-07 2004-02-03 Device for connecting a fluid circulating line to a refractory element and refractory element
AU2004210014A AU2004210014B2 (en) 2003-02-07 2004-02-03 Device for connecting a fluid circulating line to a refractory element and refractory element
UAA200508322A UA81653C2 (en) 2003-02-07 2004-03-02 Device for connecting a fluid circulating line to a refractory element and refractory element

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03447021.1 2003-02-07
EP03447021A EP1445046A1 (en) 2003-02-07 2003-02-07 Means for connecting a pipe for circulating a fluid to a refractory article and refractory article

Publications (1)

Publication Number Publication Date
WO2004069451A1 true WO2004069451A1 (en) 2004-08-19

Family

ID=32605519

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BE2004/000018 Ceased WO2004069451A1 (en) 2003-02-07 2004-02-03 Device for connecting a fluid circulating line to a refractory element and refractory element

Country Status (19)

Country Link
US (1) US7942455B2 (en)
EP (2) EP1445046A1 (en)
JP (1) JP4705012B2 (en)
KR (1) KR101007624B1 (en)
CN (1) CN100335209C (en)
AR (1) AR043000A1 (en)
AT (1) ATE328690T1 (en)
AU (1) AU2004210014B2 (en)
BR (1) BRPI0406771A (en)
CA (1) CA2514827C (en)
DE (1) DE602004001133T2 (en)
ES (1) ES2267041T3 (en)
MX (1) MXPA05008365A (en)
PL (1) PL207936B1 (en)
RU (1) RU2356690C2 (en)
TW (1) TWI319723B (en)
UA (1) UA81653C2 (en)
WO (1) WO2004069451A1 (en)
ZA (1) ZA200505391B (en)

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US20060232062A1 (en) 2006-10-19
RU2356690C2 (en) 2009-05-27
CA2514827C (en) 2012-07-03
EP1594643B1 (en) 2006-06-07
CN100335209C (en) 2007-09-05
EP1594643A1 (en) 2005-11-16
DE602004001133T2 (en) 2006-11-09
DE602004001133D1 (en) 2006-07-20
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ZA200505391B (en) 2006-09-27
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AR043000A1 (en) 2005-07-13
AU2004210014B2 (en) 2008-07-24

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