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DE4006839A1 - Sealing equipment for heated cylinder - esp. glass fibre preform tube in furnace to prevent reactive gas entry - Google Patents

Sealing equipment for heated cylinder - esp. glass fibre preform tube in furnace to prevent reactive gas entry

Info

Publication number
DE4006839A1
DE4006839A1 DE19904006839 DE4006839A DE4006839A1 DE 4006839 A1 DE4006839 A1 DE 4006839A1 DE 19904006839 DE19904006839 DE 19904006839 DE 4006839 A DE4006839 A DE 4006839A DE 4006839 A1 DE4006839 A1 DE 4006839A1
Authority
DE
Germany
Prior art keywords
furnace
flange
gas
protective gas
felt
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.)
Withdrawn
Application number
DE19904006839
Other languages
German (de)
Inventor
Hans-Juergen Lysson
Karl Dr Behm
Manuela Hahn
Adolf Moetter
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.)
Kabel Rheydt AG
Original Assignee
AEG Kabel AG
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 AEG Kabel AG filed Critical AEG Kabel AG
Priority to DE19904006839 priority Critical patent/DE4006839A1/en
Publication of DE4006839A1 publication Critical patent/DE4006839A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0053—Details of the reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0053—Details of the reactor
    • B01J19/0073—Sealings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/029—Furnaces 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/168—Sealings between relatively-moving surfaces which permits material to be continuously conveyed
    • 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
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
    • B01J2219/00094—Jackets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/80—Means for sealing the preform entry or upper end of the furnace

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Furnace Details (AREA)

Abstract

Equipment for scaling a heated cylinder against reactive gas entry in a furnace includes an elastic sealing ring which is fused by screwing a removable flange onto a fixed flange of the furnace and which prevents mixing of protective gas in the region of the furnace with reactive gases outside the furnace. The novelty is that (a) the sealing ring (2) consists of felt, pref. graphite or ceramic felt; (b) pressurised protective gas is passed through most of the furnace; and (c) the protective gas flows out through the furnace flange (6) via passages (10) of cross-section and/or number corresp. to the gas throughput. The felt ring (2) is pressed against a flange (6), fixed to the furnace lid (4), by a removable flange (3), the fixed flange having radial passageways (10) which determine the gas flow through the furnace. The protective gas is pref. a noble gas (mixt.), but particle-free air may be used. USE/ADVANTAGE - The equipment is useful for sealing tubes being heated in a furnace, esp. a collapsed preform tube being drawn to glass fibre in a drawing furnace. It provides complete prevention of reactive gas (e.g. air) entry into the space between the tube and the furnace.

Description

Die Erfindung betrifft eine Vorrichtung zum Abdichten ther­ misch beanspruchter Zylinder nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for sealing ther mixed cylinder according to the generic term of Claim 1.

In der chemischen Prozeßtechnik steht man oft vor der Auf­ gabe, ein Rohr in einem Ofen erhitzen zu müssen und dabei die Kontamination des Rohres vor allem Bereich der Erhitzungszone zu vermeiden. Bereits die Laborluft enthält mit Sauerstoff und Stickstoff reaktive Gase, welche mit dem erhitzten Zylin­ der reagieren. Dies kann höchst unerwünscht sein, wenn dieser Zylinder in seinen Eigenschaften dadurch wesentlich gemindert wird. Auch der Heizofen muß mit Schutzgas gespült werden, wenn seine Heizelemente nicht resistent gegen Sauerstoff oder Stickstoff sind. Als Spülgas wird in den Zwischenraum zwi­ schen dem zu erhitzenden Zylinder und dem Ofen ein Edelgas, wie z. B. Argon, eingeleitet. Bei ungenügender Abdichtung nach außen strömt die äußere Atmosphäre durch Kamineffekt von unten her in den Raum zwischen Rohr und Ofen und außer der störenden Einwirkung von atmosphärischen Gasen besteht die Gefahr der Kontamination durch Partikel.In chemical process engineering, one is often faced with the problem had to heat a pipe in an oven and the Contamination of the pipe, especially in the area of the heating zone to avoid. The laboratory air already contains oxygen and nitrogen reactive gases associated with the heated cylinder who react. This can be highly undesirable if this This significantly reduces the properties of cylinders becomes. The heater must also be flushed with protective gas, if its heating elements are not resistant to oxygen or Are nitrogen. As a purge gas in the space between an inert gas from the cylinder to be heated and the furnace, such as B. argon initiated. If the seal is insufficient outside the outside atmosphere flows through the chimney effect below in the space between the pipe and the furnace and except the there is the disruptive effect of atmospheric gases Risk of contamination from particles.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Abdichten thermisch beanspruchter Zylinder anzugeben, bei der eine vollkommene Abdichtung des Zwischenraums zwischen dem Zylinder und dem Heizofen gewährleistet ist und dadurch ein Eindringen der äußeren Atmosphäre zwischen Zylinder und Heizofen verhindert wird. Diese Aufgabe wird bei einer Vor­ richtung der eingangs genannten Art durch die im Kennzeichen des Anspruchs 1 aufgeführten Merkmale gelöst. The invention has for its object a device for sealing thermally stressed cylinders, at which completely seals the space between the cylinder and the heater is guaranteed and thereby penetration of the external atmosphere between the cylinder and Heater is prevented. This task is at a pre direction of the type mentioned by the in the license plate of the features listed solved.  

Vorzugsweise eignet sich die Vorrichtung zur Durchführung thermisch aktivierter Prozesse, bei denen ein von einem Schutzgas durchströmtes Rohr in einem Ofen bewegt wird, wel­ cher ebenfalls von einem Schutzgas durchspült wird. Im allge­ meinen ist der Ofen widerstandsbeheizt. Die Vorteile gegen­ über dem Stand der Technik sind insbesondere in einer höheren Dichtigkeit und thermischen Belastbarkeit der abschließenden Filzringe zu sehen. Diese Ringe sind geeignet, den Zylinder zu führen und zu zentrieren. Dabei sind sowohl Verschiebe­ als auch Drehbewegungen des Zylinders möglich.The device is preferably suitable for implementation thermally activated processes, in which one of one Inert gas flowing tube is moved in an oven, wel cher is also flushed through a protective gas. Generally mine is resistance heated. The advantages against are above the state of the art in particular in a higher Tightness and thermal resilience of the final See felt rings. These rings are suitable for the cylinder to guide and center. Both are moving as well as rotary movements of the cylinder.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Die Fig. 1 zeigt eine perspek­ tivische Darstellung der Vorrichtung, Fig. 2 eine schemati­ sche Darstellung der Gasströme in einem Ziehofen.An embodiment of the invention is explained below with reference to the drawing. Fig. 1 shows a perspective view of the device, Fig. 2 shows a schematic representation of the gas flows in a drawing furnace.

In einem bevorzugten Anwendungsbeispiel der Erfindung wird der kollabierte Vorformzylinder 1 in einem Ziehofen 6 zur Glasfaser 13 ausgezogen. Der obere Teil der Abdichtung ent­ spricht der Fig. 1. Wie Fig. 2 zeigt, wird bei 14 Schutzgas in das Ofeninnere geleitet. Die Abdichtung der Glasfaser 13 gegen den Ofen geschieht mittels einer Blende 12.In a preferred application example of the invention, the collapsed preform cylinder 1 is drawn out to the glass fiber 13 in a drawing furnace 6 . The upper part of the seal speaks accordingly in FIG. 1. As FIG. 2 shows, protective gas is passed into the furnace interior at 14 . The glass fiber 13 is sealed off from the furnace by means of an aperture 12 .

Die Dichtvorrichtung besteht aus einem Filzring 2 (oder meh­ reren Filzringen), welche den Ofenraum nach oben gegen den Zylinder 1 abdichten. Das Schutzgas gelangt über Bohrungen 10 und einem Ringkanal 11 im Ofendeckel 4 über Bohrungen 8 in der Überwurfmutter 3 ins Freie. Die Überwurfmutter 3 preßt die Filzringe einerseits gegen die Wand des Rohres 1 (hier den Vorformzylinder) und andererseits gegen den Ofendeckel 4. Gegebenenfalls ist noch eine Unterlegscheibe 9 vorgesehen. Die Filzringe haben außen beispielsweise 50 mm Durchmesser und einen Innendurchmesser, welcher dem Außendurchmesser des Zylinders 1 entspricht. Im vorliegenden Fall beträgt der Vorformdurchmesser 17 mm. Zwischen Ofendeckel und Ofen befin­ det sich die Dichtung 5.The sealing device consists of a felt ring 2 (or several felt rings) which seal the furnace space upwards against the cylinder 1 . The protective gas passes outside through holes 10 and an annular channel 11 in the furnace cover 4 through holes 8 in the union nut 3 . The union nut 3 presses the felt rings on the one hand against the wall of the tube 1 (here the preform cylinder) and on the other hand against the furnace cover 4 . If necessary, a washer 9 is also provided. The outside of the felt rings has, for example, 50 mm diameter and an inside diameter which corresponds to the outside diameter of the cylinder 1 . In the present case, the preform diameter is 17 mm. The seal 5 is located between the furnace lid and the furnace.

In einem weiteren Ausführungsbeispiel wird zur Herstellung von Glasfasern ein Vorformzylinder 1 aus Quarzglas durch eine heiße Zone des Ofens 6 bewegt und dabei aus einem Reaktions­ gas im Inneren des Rohres 1 dotiertes Quarzglas abgeschieden. Dabei kann das Rohr fest eingespannt sein, während sich der Ofen 6 mit dem Heizelement 7 längs des Rohres bewegt. Die Abdichtung am unteren Ende des Ofens ist nicht dargestellt. Das Schutzgas für den Ofen wird unten eingeleitet, wobei der Ofen im Grunde auch unten dieselbe Dichtvorrichtung aufweisen kann. Am unteren Ende ist aber die Abdichtung nicht so kri­ tisch, da der Gasdurchsatz hauptsächlich durch den Strömungs­ widerstand am oberen Ende des Ofens bestimmt wird. Lediglich bei horizontaler Anordnung der Achse des Rohres 1 ist eine symmetrische Anordnung der Vorrichtung vorzuziehen.In a further exemplary embodiment, a preform cylinder 1 made of quartz glass is moved through a hot zone of the furnace 6 in order to produce glass fibers and, in the process, deposited doped quartz glass from a reaction gas inside the tube 1 . The tube can be firmly clamped while the furnace 6 moves with the heating element 7 along the tube. The seal at the bottom of the furnace is not shown. The protective gas for the furnace is introduced at the bottom, and the furnace can basically also have the same sealing device at the bottom. At the lower end, however, the seal is not so critical, since the gas throughput is mainly determined by the flow resistance at the upper end of the furnace. A symmetrical arrangement of the device is preferred only when the axis of the tube 1 is arranged horizontally.

Es können in dem Rohr 1 selbstverständlich auch andere Pro­ zesse ablaufen. In der Halbleitertechnik wären dies bei­ spielsweise Diffusionsprozesse oder Festkörperreaktionen. Als Spülgas für den Ofen kommen Edelgase bzw. deren Gemische infrage. Aus Kostengründen ist Argon im allgemeinen vorzuzie­ hen.Of course, other processes can also run in the tube 1 . In semiconductor technology, this would be, for example, diffusion processes or solid-state reactions. Noble gases or their mixtures can be used as purge gas for the furnace. Argon is generally preferred for cost reasons.

Claims (8)

1. Vorrichtung zum Abdichten thermisch beanspruchter Zylin­ der in einem Ofen gegen das Eindringen reaktiver Gase mit einem Dichtring aus elastischem Material, welcher mit einem lösbaren Flansch an einen festen Flansch des Ofens geschraubt ist und ein Durchmischen des Schutz­ gases im Bereich des Ofens mit den reaktiven Gasen außerhalb des Ofens verhindert, dadurch gekennzeichnet, daß der Dichtring (2) aus einem Filz besteht, daß der Ofen zum überwiegenden Teil mit Schutzgas durchspült ist, welches unter einem Überdruck steht, und wobei das Schutzgas durch Bohrungen, welche im Querschnitt und/oder ihre Anzahl dem Gasdurchsatz angepaßt sind, seitlich durch den Ofenflansch heraus­ strömt.1. Device for sealing thermally stressed Zylin in a furnace against the penetration of reactive gases with a sealing ring made of elastic material, which is screwed to a fixed flange of the furnace with a releasable flange and mixing the protective gas in the region of the furnace with the reactive Prevents gases outside the furnace, characterized in that the sealing ring ( 2 ) consists of a felt, that the furnace is largely flushed with protective gas, which is under an overpressure, and wherein the protective gas through bores which have a cross-section and / or their number is adapted to the gas throughput, flows out through the side of the furnace flange. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß als Schutzgas Edelgase in reiner Form oder als Gemisch Verwendung finden.2. Device according to claim 1, characterized in that as a protective gas noble gases in pure form or as a mixture Find use. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeich­ net, daß als Dichtring (2) ein Graphitfilz Verwendung findet.3. Apparatus according to claim 1 or 2, characterized in that a graphite felt is used as the sealing ring ( 2 ). 4. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeich­ net, daß als Dichtring (2) ein Keramikfilz Verwendung findet. 4. Apparatus according to claim 1 or 2, characterized in that a ceramic felt is used as the sealing ring ( 2 ). 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zwei Dichtringe (2) Verwendung fin­ den.5. Device according to one of claims 1 to 4, characterized in that two sealing rings ( 2 ) use fin the. 6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Filzring mittels eines lösbaren Flansches (3) gegen den am Ofendeckel (4) befestigten Flansch (6) gepreßt ist.6. Device according to one of claims 1 to 5, characterized in that the felt ring is pressed by means of a releasable flange ( 3 ) against the flange ( 6 ) attached to the furnace cover ( 4 ). 7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß im festen Flansch radiale Bohrungen angeordnet sind, die einen definierten Gasfluß durch den Ofen festlegen.7. Device according to one of claims 1 to 6, characterized characterized in that radial bores in the fixed flange are arranged that a defined gas flow through the Define the oven. 8. Vorrichtung nach Anspruch 1 oder einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, daß von Partikeln gerei­ nigte Luft als Schutzgas Verwendung findet.8. The device according to claim 1 or one of claims 3 to 7, characterized in that cleaned from particles air is used as a protective gas.
DE19904006839 1990-03-05 1990-03-05 Sealing equipment for heated cylinder - esp. glass fibre preform tube in furnace to prevent reactive gas entry Withdrawn DE4006839A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904006839 DE4006839A1 (en) 1990-03-05 1990-03-05 Sealing equipment for heated cylinder - esp. glass fibre preform tube in furnace to prevent reactive gas entry

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904006839 DE4006839A1 (en) 1990-03-05 1990-03-05 Sealing equipment for heated cylinder - esp. glass fibre preform tube in furnace to prevent reactive gas entry

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DE4006839A1 true DE4006839A1 (en) 1991-09-12

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2739374A1 (en) * 1995-09-29 1997-04-04 Samsung Electronics Co Ltd Optical fibre spinning furnace - having inlet and outlet apertures, heater for optical fibre preform, means for establishing inert gas flow within furnace, and inlet sleeve in which inlet aperture is formed and having inner surface projections and/or indentations
FR2749296A1 (en) * 1996-05-29 1997-12-05 Alcatel Fibres Optiques Air-tight enclosure for a fibrillating tower for the fabrication of an optic fibre
WO2000068157A1 (en) * 1999-05-10 2000-11-16 Pirelli Cavi E Sistemi S.P.A. Method and induction furnace for drawing large diameter preforms to optical fibres
FR2802916A1 (en) * 1999-12-27 2001-06-29 Cit Alcatel PREFORM INPUT ARRANGEMENT FOR FIBER OPTIC DRAWING OVEN, OVEN HAVING SUCH ARRANGEMENT AND PREFORM EQUIPPED TO COOPERATE WITH THIS ARRANGEMENT
US7320232B2 (en) * 2000-04-18 2008-01-22 Samsung Electronics Co., Ltd. Apparatus for fabricating holey optical fiber
EP2028165A1 (en) * 2007-07-24 2009-02-25 Shin-Etsu Chemical Co., Ltd. A furnace for fabricating a glass preform or an optical fiber
EP2218693A3 (en) * 2009-02-17 2012-04-18 Shin-Etsu Chemical Co., Ltd. Seal member
US8322165B2 (en) * 2007-08-10 2012-12-04 Shin-Etsu Chemical Co., Ltd. Apparatus for fabricating an optical fiber
DE102013106786A1 (en) * 2013-06-28 2014-12-31 Jasper Gesellschaft für Energiewirtschaft und Kybernetik mbH Heating tube for a recuperative burner
CN107366749A (en) * 2017-08-28 2017-11-21 利辛县宝隆橡塑密封件有限责任公司 A kind of dust seal
WO2019126461A1 (en) 2017-12-20 2019-06-27 Heraeus Quartz North America Llc Variable diameter seal for optical preform furnace
CN111215002A (en) * 2020-01-20 2020-06-02 中南大学 High temperature and high pressure supercritical carbon dioxide reactor

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DE1165952B (en) * 1962-02-07 1964-03-19 Klein Schanzlin & Becker Ag Locking chamber ring for stuffing boxes
US3490775A (en) * 1967-12-15 1970-01-20 Langford W Henshaw Stuffing box packing assembly
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DE7118400U (en) * 1971-09-30 Kempchen & Co Gmbh Seal, in particular sealing washer, sealing ring
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US4157835A (en) * 1975-04-08 1979-06-12 Otto Kahle Strip seal for stuffing box packing
US4321446A (en) * 1979-08-21 1982-03-23 Toho Beslon Co., Ltd. Apparatus for production of graphite fibers
DE3337092C1 (en) * 1983-10-12 1985-07-18 Maschinenbau Scholz Gmbh & Co Kg, 4420 Coesfeld Device for sealing the removable closure member of pressure vessels
DE3432852C1 (en) * 1984-09-07 1985-10-31 Goetze Ag, 5093 Burscheid Sliding ring for a mechanical seal with, in particular, varying frictional stress with simultaneous compressive stress
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DE3529774A1 (en) * 1985-08-20 1987-02-26 Peter Btr Gummiwerke Ag Sealing element
DE3817112A1 (en) * 1987-05-20 1988-12-01 Hitachi Chemical Co Ltd Sealing material and cylinder head gasket
DE3912711A1 (en) * 1988-05-31 1989-12-14 Norton Co Process and apparatus for reducing harmful effects on structural components in hot surroundings
DE3823733A1 (en) * 1988-07-13 1990-01-18 Bodenseewerk Perkin Elmer Co DEVICE FOR THE ELECTROTHERMAL ATOMIZATION OF A SAMPLE FOR SPECTROSCOPIC PURPOSES

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7118400U (en) * 1971-09-30 Kempchen & Co Gmbh Seal, in particular sealing washer, sealing ring
DE1165952B (en) * 1962-02-07 1964-03-19 Klein Schanzlin & Becker Ag Locking chamber ring for stuffing boxes
AT299637B (en) * 1967-02-01 1972-06-26 Engelhard Min & Chem Device for the sealed fastening of a thin-walled diffusion tube for hydrogen
GB1238533A (en) * 1967-09-27 1971-07-07
US3490775A (en) * 1967-12-15 1970-01-20 Langford W Henshaw Stuffing box packing assembly
US4157835A (en) * 1975-04-08 1979-06-12 Otto Kahle Strip seal for stuffing box packing
US4321446A (en) * 1979-08-21 1982-03-23 Toho Beslon Co., Ltd. Apparatus for production of graphite fibers
DE3337092C1 (en) * 1983-10-12 1985-07-18 Maschinenbau Scholz Gmbh & Co Kg, 4420 Coesfeld Device for sealing the removable closure member of pressure vessels
DE3432852C1 (en) * 1984-09-07 1985-10-31 Goetze Ag, 5093 Burscheid Sliding ring for a mechanical seal with, in particular, varying frictional stress with simultaneous compressive stress
DE3529774A1 (en) * 1985-08-20 1987-02-26 Peter Btr Gummiwerke Ag Sealing element
DE3604493C1 (en) * 1986-02-13 1986-12-11 Abicht, Roland, Ing.(grad.), 5828 Ennepetal Refractory lining for an industrial furnace
DE3817112A1 (en) * 1987-05-20 1988-12-01 Hitachi Chemical Co Ltd Sealing material and cylinder head gasket
DE3912711A1 (en) * 1988-05-31 1989-12-14 Norton Co Process and apparatus for reducing harmful effects on structural components in hot surroundings
DE3823733A1 (en) * 1988-07-13 1990-01-18 Bodenseewerk Perkin Elmer Co DEVICE FOR THE ELECTROTHERMAL ATOMIZATION OF A SAMPLE FOR SPECTROSCOPIC PURPOSES

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2739374A1 (en) * 1995-09-29 1997-04-04 Samsung Electronics Co Ltd Optical fibre spinning furnace - having inlet and outlet apertures, heater for optical fibre preform, means for establishing inert gas flow within furnace, and inlet sleeve in which inlet aperture is formed and having inner surface projections and/or indentations
FR2749296A1 (en) * 1996-05-29 1997-12-05 Alcatel Fibres Optiques Air-tight enclosure for a fibrillating tower for the fabrication of an optic fibre
WO2000068157A1 (en) * 1999-05-10 2000-11-16 Pirelli Cavi E Sistemi S.P.A. Method and induction furnace for drawing large diameter preforms to optical fibres
US7814767B2 (en) 1999-05-10 2010-10-19 Prysmian Cavi E Sistemi Energia S.R.L. Method and induction furnace for drawing large diameter preforms to optical fibres
EP1112978A1 (en) * 1999-12-27 2001-07-04 Alcatel Preform entry device for an optical fibre draw furnace and draw furnace comprising said entry device
US6993937B2 (en) 1999-12-27 2006-02-07 Alcatel Preform inlet arrangement for an optical fiber drawing furnace, a furnace provided with that kind of inlet arrangement, and a preform equipped to co-operate with that inlet arrangement
FR2802916A1 (en) * 1999-12-27 2001-06-29 Cit Alcatel PREFORM INPUT ARRANGEMENT FOR FIBER OPTIC DRAWING OVEN, OVEN HAVING SUCH ARRANGEMENT AND PREFORM EQUIPPED TO COOPERATE WITH THIS ARRANGEMENT
US7320232B2 (en) * 2000-04-18 2008-01-22 Samsung Electronics Co., Ltd. Apparatus for fabricating holey optical fiber
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CN111215002A (en) * 2020-01-20 2020-06-02 中南大学 High temperature and high pressure supercritical carbon dioxide reactor

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