US3751219A - Annealing furnace seal - Google Patents

Annealing furnace seal Download PDF

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Publication number
US3751219A
US3751219A US00193348A US3751219DA US3751219A US 3751219 A US3751219 A US 3751219A US 00193348 A US00193348 A US 00193348A US 3751219D A US3751219D A US 3751219DA US 3751219 A US3751219 A US 3751219A
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US
United States
Prior art keywords
trough
tube
base
filler
annealing
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Expired - Lifetime
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US00193348A
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English (en)
Inventor
F Kitchel
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United States Steel Corp
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Steel Corp
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Publication date
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Publication of US3751219A publication Critical patent/US3751219A/en
Assigned to USX CORPORATION, A CORP. OF DE reassignment USX CORPORATION, A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). Assignors: UNITED STATES STEEL CORPORATION (MERGED INTO)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
    • 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
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure

Definitions

  • a seal for eliminating or reducing air infiltration Into an 235 A inner cover of a steel annealing furnace includes a tube of stainless steel mesh filled with a woven ceramic blan- [56] References Cited ket, preferably arranged in a roll. The bottom of the UNITED STATES PATENTS inner cover rests on the tube.
  • This invention relates to a seal and more particularly to a seal for preventing infiltration of air into the inner cover of a batch type annealing furnace.
  • Such furnaces sometimes called bell annealing furnaces, include a base upon which coils of steel strip are stacked and a removable inner cover on the base.
  • One or more such bases are arranged beneath a removable outer cover carrying heating means thereon.
  • An annealing atmosphere is circulated within each inner cover by means of a fan and it is necessary to provide a seal to prevent infiltration of air into the inner cover and escape of atmosphere from the inner cover.
  • the present seal is an improvement over those shown in Gordon et al., US Pat. No. 3,438,617 dated Apr. 15, 1969; and my prior US Pat. No. 3,471,137 dated Oct. 7, 1969.
  • the Gordon seal was originally used and was found to provide a satisfactory seal when first installed.
  • the top layers of the seal deteriorated to such an extent that these layers had to be removed and replaced by new material.
  • Eventually the entire seal had to be discarded. Even before removal of these top layers their gradual deterioration resulted in contaminating the charge more than was desirable.
  • these seals were replaced by the seals of my prior patent which 'proved more satisfactory than the Gordon seals.
  • the ceramic fibers of the tube tended to break down and separate from the tube.
  • the breakdown first occurs on that portion of the tube within the inner cover and the ceramic fibers were picked up by the stream of annealing gases within the inner cover. This resulted in contaminating-the charge, but to a lesser extent than with the Gordon seal.
  • the filler material also tended to break up into smaller pieces and worked out through the tube. The smaller particles were compressed to a greater degree than the larger particles and the resiliency of the seal decreased so that it did not provide as good a seal. Therefore, the seals had to be discarded after 30 to 35 heats.
  • the bulk filler tended to pack and after every 5 or 10 heats the seal was fluffed to redistribute the filler.
  • Another object is to provide such a seal which results in less contamination of the charge.
  • FIG. 1 is a horizontal sectional view of an inner annealing cover and supporting structure with my seal incorporated therein; 1
  • FIG. 2 is a view taken on line 11-11 of FIG. I, but showing only one half of the furnace;
  • FIG. 3 is an enlarged view taken on line IIIIII of FIG. 2;
  • FIG. 4 is an enlarged view of the connection between the ends of the seal member
  • FIG. 5 is a view similar to FIG. 3 showing a second modification of my' invention.
  • FIG. 6 is a schematic view showing the shape of the seal member at various stages in its use.
  • reference numeral 2 indicates the base of an annealing furnace for supporting a coil C (FIG. 1) of steel strip.
  • a fan 4 (FIG. 2) is used to circulate annealing atmosphere through and around the coil C beneath a corrugated inner cover 6 (FIG. 1,3) which is preferably made of stainless steel.
  • a vertical skirt 8' ( FIG. 1,3) is provided at the lower end of the cover 6.
  • the base 2 includes a circumferential vertical steel plate 10 (FIG. 1 A trough 12 (FIGS. l3,5,6) surrounds the circular base 2 below the top thereof.
  • Inner leg 14 (FIGS.
  • each gusset plate 16 tapers downwardly and outwardly to form guides 18 (FIGS. 1,3) for the cover 16.
  • Sealing member 20 (FIGS. l,3,5,6) of my invention consists of a flexible tube 22 (FIGS. 3-5) with a deformable blanket 2 (FIGS. 3-5).
  • the tube 22 must be made of metal which resists decomposition at annealing temperatures in annealing atmospheres and which has little or no permanent set. I have found that a tube 22 made of Grade No. 430 stainless steel 100 mesh is very satisfactory. It is preferred that the mesh be between and 120.
  • the blanket 24 must also have the ability to resist permanent set and to be relatively impermeable to the annealing atmosphere.
  • a woven fibre blanket 24 made of aluminate sicate or the like and rolled into a cylindrical shaped solid having a plurality of convolutions as shown in FIG. 3 is particularly satisfactory.
  • the blanket 24 is preferably composed of ceramic fibre one inch thick of 8 pound density. The material must be able to withstand annealing temperatures without substantial deterioration. Most ceramic materials would be satisfactory. It is preferred that the blanket 24 be made of one piece beacuse it eliminates joints and also makes for a better seal. However, it is obvious that it could be made in more than one piece.
  • the blanket 24 may be folded into a plurality of layers as shown in FIG. 5, but this results in poorer sealing and also exposes more of the blanket 24 to the hot annealing gases which will cause faster deterioration.
  • the sealing member 20 extends completely around the periphery of trough l2 and has its .ends joined in any suitable manner.
  • the ends of the filler 24 may have opposed halves removed and overlapped and the tube 22 may have one end 26 surrounding the other end 28.
  • a bulk filler 24 may be used with a metal tube 22. This combination is both cheaper and better than the seal of my patent, but probably does'not have as long a life as the preferred seal described above.
  • a blanket filler 24 may be used with the tube of my prior patent. This combination is better than the seal of my patent and its cost is about the same as that seal.
  • the blanket 30 is preferably of the same material as blanket 24.
  • These bottom layers 30 protect the metal shell of the base 2 from heat thus preventing oxidation and warpage and it is believed that this material 30 cushions the shear effect between the inner cover 6 and the base shell 2 when the cover 6 is set in place.
  • the member is placed in the trough 12 on the layers 30 and preferably compressed into oval shape as shown schematically in full lines in FIG. 6. After the charge is placed on the base 2, the inner cover 6 is lowered into the trough 12 with the guides 18 positioning the inner cover 6 in the desired position on member 20.
  • leg 8 of the inner cover 6 is generally equal to the diameter of trough 12 at the center thereof, but may vary therefrom. The variation preferably should not exceed 2 inches.
  • leg 8 of the inner cover 6 When the leg 8 of the inner cover 6 is lowered onto the member 20 it will depress the upper part of it approximately to the broken line position 22A shown in FIG. 6. When the inner cover is removed the member 20 will expand somewhat upwardly to approximately the dash-dot line 22B shown in FIG. 6. When the inner cover 6 is lowered a second and sub sequent time the guides 18 will return the inner cover 6 to relatively the same position so that a better seal and longer life is provided.
  • the member 20 has sufficient strength to support the full weight of the inner cover 6, that it has sufficient resiliency to provide a very good seal and that it will not contaminate the charge. It will also be understood that the seal 20 will not assume the exact shape shown, but will contact the walls and bottom of the trough 12.
  • a furnace having a base, a peripheral trough surrounding said base, said trough having inner and outer sides, and a cover adapted to surround said base with its lower end in said trough
  • the improvement comprising a flexible tube consisting of metal which resists decomposition at annealing temperatures in annealing atmospheres and which has little permanent set, and a deformable filler in said tube, said filler resisting permanent set and being relatively impermeable to the annealing atmosphere, the length and cross section of said filled tube being such as to extend completely around the periphery of the trough in bearing engagement with the sides of the trough, said deformable filler being a ceramic woven fibre blanket, and said filler being in the form of a roll having a plurality of convolutions.
  • a flexible tube consisting of metal which resists decomposition at annealing temperatures in annealing atmospheres and which has little permanent set
  • a deformable filler in said tube, said filler resisting permanent set and being relatively impermeable to the an nealing atmosphere, the length and cross sectionof said filled tube being such as to extend completely around the periphery of the trough in bearing engagement with the sides of the trough, said deformable filler being a ceramic woven fibre blanket, said tube being a stainless steel mesh, and said filler being in the form of a roll having a plurality of convolutions.
  • a flexible tube consisting of metal which resists decomposition at annealing temperatures in annealing atmospheres and which has little permanent set, and a deformable filler in said tube, said filler resisting permanent set and being relatively impermeable to the annealing atmosphere, the length and cross section of said filled tube being such as to extend completely around the periphery of the trough in bearing engagement with the sides of the trough, and having a ceramic woven fibre layer on the bottom of said trough on which said tube rests.
  • a furnace having a base, a peripheral trough surrounding said base, said trough having inner and outer sides and a cover adapted to surround said base with its lower end in said trough, the improvement comprising a flexible woven tube which resists decomposition at annealing temperatures in annealing atmospheres and which has little permanent set, and a deformable ceramic woven fibre blanket, the length and cross section of said flexible woven tube being such as to extend completely around the periphery of the trough in bearing engagement with the sides of the trough and said deformable ceramic woven fibre blanket being in the form of a roll having a plurality of convolutions.
  • a furnace having a base, a peripheral trough surrounding said base, said trough having inner and outer sides, and a cover'adapted to surround said base with its lower end in said trough, the improvement comprising a flexible woven tube which resists decomposition at annealing temperatures in annealing atmospheres and which has little permanent set, and a deformable ceramic woven fibre blanket, the length and cross section of said flexible woven tube being such as to extend completely around the periphery of the trough in bearing engagement with the sides of the trough and having a ceramic woven fibre layer on the bottom of said trough on which said flexible woven tube rests.
  • a flexible tube consisting of metal which resists decomposition at annealing temperatures in annealing atmospheres and which has little permanent set, and a deformable filler in said tube, said filler resisting permanent set and being relatively impermeable to the annealing atmosphere, the length and cross section of said filled tube being such as to extend completely around the periphery of the trough in bearing engagement with the sides of the trough, said filler being in the form of a roll having a plurality of convolutions.
  • a flexible tube consisting of metal which resists decomposition at annealing temperatures in annealing atmospheres and which has little permanent set, and a deformable filler in said tube, said filler resisting permanent set and being relatively impermeable to the annealing atmosphere, the length and cross section of said filled tube being such as to extend completely around the periphery of the trough in bearing engagement with the sides of the trough, said fllle being folded into a plurality of layers.
  • a furnace having a base, a peripheral trough surrounding said base, said trough having inner and outer sides, and a cover adapted to surround said base with its lower end in said trough, the improvement comprising a flexible woven tube which resists decomposition at annealing temperatures in annealing atmospheres and which has little permanent set, and a deformable ceramic woven fibre blanket, the length and cross section of said flexible woven tube being such as to extend completely around the periphery of the trough in bearing engagement with the sides of the trough, said deformable ceramic woven fibre blanket being folded into a plurality of layers.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Gasket Seals (AREA)
US00193348A 1971-10-28 1971-10-28 Annealing furnace seal Expired - Lifetime US3751219A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19334871A 1971-10-28 1971-10-28

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Publication Number Publication Date
US3751219A true US3751219A (en) 1973-08-07

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Country Status (7)

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US (1) US3751219A (it)
JP (1) JPS4851807A (it)
DE (1) DE2252639A1 (it)
ES (1) ES408090A1 (it)
GB (1) GB1411277A (it)
IT (1) IT975402B (it)
NL (1) NL7214614A (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427378A (en) 1982-03-29 1984-01-24 Atomel Corporation Closure and seal construction for high-pressure oxidation furnace and the like
US4701127A (en) * 1982-12-10 1987-10-20 Borg-Warner Corporation Controlled atmosphere capsule for fluxless brazing
US5090137A (en) * 1990-01-16 1992-02-25 W. R. Grace & Co.-Conn. Perimeter seal for split enclosure drying hoods
WO2014096543A1 (en) * 2012-12-20 2014-06-26 Outotec Oyj Sealing device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5415005U (it) * 1977-07-05 1979-01-31
DE2815274C3 (de) * 1978-04-08 1981-07-09 Deere & Co. Niederlassung Deere & Co. European Office, 6800 Mannheim, Moline, Ill. Vorrichtung zum Abdichten von Öfen
FR2635175B1 (fr) * 1988-08-04 1993-03-05 Stein Heurtey Perfectionnements apportes aux fours cloche utilises notamment pour le recuit de bobines metalliques sous atmosphere controlee
DE4005653A1 (de) * 1990-02-23 1991-08-29 Loi Ind Ofenanlagen Industrieofen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179394A (en) * 1963-09-11 1965-04-20 Wilson Eng Co Inc Lee Solid seal for inner covers
US3438617A (en) * 1968-04-10 1969-04-15 Pullman Inc Atmospheric seals
US3471137A (en) * 1967-11-02 1969-10-07 United States Steel Corp Annealing furnace seal
US3476370A (en) * 1968-01-19 1969-11-04 United States Steel Corp Annealing furnace seal
US3481824A (en) * 1965-12-23 1969-12-02 Johns Manville Expansible packing with metal mesh core

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179394A (en) * 1963-09-11 1965-04-20 Wilson Eng Co Inc Lee Solid seal for inner covers
US3481824A (en) * 1965-12-23 1969-12-02 Johns Manville Expansible packing with metal mesh core
US3471137A (en) * 1967-11-02 1969-10-07 United States Steel Corp Annealing furnace seal
US3476370A (en) * 1968-01-19 1969-11-04 United States Steel Corp Annealing furnace seal
US3438617A (en) * 1968-04-10 1969-04-15 Pullman Inc Atmospheric seals

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427378A (en) 1982-03-29 1984-01-24 Atomel Corporation Closure and seal construction for high-pressure oxidation furnace and the like
US4701127A (en) * 1982-12-10 1987-10-20 Borg-Warner Corporation Controlled atmosphere capsule for fluxless brazing
US5090137A (en) * 1990-01-16 1992-02-25 W. R. Grace & Co.-Conn. Perimeter seal for split enclosure drying hoods
WO2014096543A1 (en) * 2012-12-20 2014-06-26 Outotec Oyj Sealing device
CN104956129A (zh) * 2012-12-20 2015-09-30 奥图泰(芬兰)公司 密封装置
EA027779B1 (ru) * 2012-12-20 2017-08-31 Оутотек (Финлэнд) Ой Уплотнительное устройство

Also Published As

Publication number Publication date
IT975402B (it) 1974-07-20
GB1411277A (en) 1975-10-22
ES408090A1 (es) 1975-09-16
JPS4851807A (it) 1973-07-20
DE2252639A1 (de) 1973-05-03
NL7214614A (it) 1973-05-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: USX CORPORATION, A CORP. OF DE, STATELESS

Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960

Effective date: 19880112