US3424444A - Bell furnaces for heat-treating coiled strip metal and the like - Google Patents

Bell furnaces for heat-treating coiled strip metal and the like Download PDF

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Publication number
US3424444A
US3424444A US546301A US54630166A US3424444A US 3424444 A US3424444 A US 3424444A US 546301 A US546301 A US 546301A US 54630166 A US54630166 A US 54630166A US 3424444 A US3424444 A US 3424444A
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US
United States
Prior art keywords
gas
heat
exchanger
base
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US546301A
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English (en)
Inventor
Jean Raymond Guingand
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.)
Heurtey SA
Original Assignee
Heurtey SA
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
Priority claimed from FR15984A external-priority patent/FR1443248A/fr
Priority claimed from FR29601A external-priority patent/FR88545E/fr
Application filed by Heurtey SA filed Critical Heurtey SA
Application granted granted Critical
Publication of US3424444A publication Critical patent/US3424444A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/048—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics with the regulating means inside the fluid springs
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • An apparatus for cooling an atmosphere gas circulating, in response to a recycling fan, between a base and a protective cover of a heating bell furnace used for heat-treating products such as spools of strip-metal includes at least one atmosphere gas heat exchanger having at least one gas inlet located beneath said cover in a position where an overpressure prevails, and at least one gas outlet likewise located beneath said cover in a position where a negative relative pressure prevails, the gas flow through said heat exchanger being effected by said single fan, a gas duct element being retractable into said base mechanically associated with said inlet.
  • strip coiled strip metal
  • bell furnaces The heat treatment of coiled strip metal (hereinafter referred to as strip) under the controlled atmosphere of bell furnaces is usually slowed down by the lengthy period during which the spools into which the strip is coiled are allowed to cool.
  • each spool-supporting base is equipped with a fan which causes the atmosphere gas to circulate beneath the cover itself, especially during the heating period.
  • the intake and outlet points and their locations are so devised that the intake point into the heat-exchanger are located in a part of said base whereat the atmosphere gas is at overpressure and the return-flow outlet from said exchanger in a part of the base whereat the atmosphere gas is at lower pressure.
  • said inlet into the heat-exchanger isassociated with an obturator which is retractable in order not to hinder ventilation during the heating phase.
  • Said obturator surmounts a profiled duct which improves the intake when the obturator is lifted.
  • the cold-gas return flow outlet is formed by an oblong nozzle fitted with deflectors.
  • this condensed water evaporates once more inside the exchanger and is carried along in the form of vapor by the atmosphere gas as the latter is recycled.
  • This vapor can deteriorate the charge by producing thereon, in the case of a ferrous metal for instance, an undesirable blue oxide film.
  • FIG. 1 shows fragmentally with cutaway a base of a furnace for heat-treating strip spools, said base being equipped with a single fan and with means for establishing at will a bypassed flow of atmosphere gas through accelerated-cooling heat exchangers.
  • FIG. 2 is a plan view corresponding to FIG. 1.
  • FIG. 3 is a detail side elevation view of the inlet and outlet of a heat exchanger.
  • FIG. 4 shows on an enlarged scale the leakproofing means used for the operating rod of an inlet obturator.
  • FIG. 5 is a detail view on an enlarged scale of means for detecting water in a heat exchanger.
  • FIG. 6 is a fragmental sectional view with cutaway of a heat-treatment furnace base portion at the location of the bleed pipe, and of the furnace inlet located between the ditfuser blades;
  • FIG. 7 is a corresponding sectional view showing the location of said bleed pipe and the disposition of the isolating valve.
  • FIG. 1 The form of embodiment shown in FIG. 1 includes a base 1 of refractory material mounted on a support 2 fabricated from metal girders and supported in turn on posts 3.
  • a heating bell (not shown), inside which the junction between said base and the lower frusto-conical portion 5 of a protective cover is rendered leakproof by means of a ring of sand 4.
  • a charge-carrying plate 6 Inside said cover portion 5 is arranged a charge-carrying plate 6 on which rests the charge proper 7, consisting of stacked strip-spools of which the turns, though normally tightly wound thereon, may alternatively be loose, but through which an inner passage or chimney 8 is formed in all cases.
  • Plate 6 rests upon the blades 9 of a diffuser bounding a central area in which rotates a centrifugal fan wheel 10 mounted on a shaft 11 carried in a sealed bearing 12, the opposite external end of shaft 11 supporting thereon pulleys 13 which are rotated through the medium of belts 14 by the drive pulleys 15 of an electric motor 16.
  • the blades 9 additionally rest on a plate 17 designed to reinforce the top of refractory base 1.
  • Plate 17 is formed with an upturned flared rim 18 which leaves clear an annular slit 19 for impelling therethrough the atmosphere gas trapped beneath cover 5, which gas is sucked by fan 10 into passage 8 and impelled between blades 9 towards said annular slit 19.
  • a lined passageway 20 which communicates with a suitably bent conduit 21 extending into a tube coil 22 which is submerged in water contained in a cooling tank 23 fitted with inlet and outlet water pipes 24 and 25.
  • the exit from tube coil 22 extends upwardly through a pipe 26 into a further pasageway 27 formed in base 1 and projects upwardly therefrom in the form of a flattened nozzle 28 which may be made co-extensive with rim 18 and cover portion 5, up to the upper end-section of the latter.
  • Cylindrical body 29 is connected through struts 33 to an operating rod 34 which passes through the bend in pipe 21 via a leaktight gland 35 and is connected to the rod 36 of a hydraulic jack 37 mounted on the associated post 3.
  • flared nozzle 28 has, positioned in the center thereof, a pair of symmetrical deflectors 38 (see FIG. 3) for distributing the gas flow through the gap between the periphery of charge 7 and the inner wall of protective cover 5.
  • rod 34 extends through a bushing 39 having therein a guide 41 formed with grooves 40, which guide 41 creates pressure losses required to protect a plastic leakproof gland 42 therebelow made of graphite-bearing asbestos which is compressed by a plug 43 screwed over the bushing through which said rod extends.
  • a pressurizing pipe stub 44 has a port between gland 42 and guide 41.
  • a drain 45 on to which a plug 46 is sealingly screwed over a rubber gasket Said drain communicates with a suitably bent dip-tube 47 which passes through the opposite wall of the tube coil and extends, as a safety measure, up to a burner which heats a warning bi-metallic strip. Similar drains, devoid of a warning device, are provided at the lowermost points of the other turns.
  • the system hereinbefore described includes diametrically opposed pairs of cooling means, this uniform layout ensuring that the general pattern of flow of the atmosphere gas beneath the cover 5, in response to the single fan 10, is not disturbed.
  • the outlet pipe 26 from the cooling heat exchanger is disposed as near as possible to refractory base 1, with a leaktight closable isolation valve 50.
  • a bleed pipe 51 has a nozzle 52 which opens into pipe 26 upstream of valve 50 and is adapted to deliver thereinto a flow of atmosphere gas.
  • Pipe 51 is bent so as to pass through refractory base 1 and plate 17 and it terminates between blades 9 at a point where there prevails a gas pressure higher than that prevailing outside the diffuser 18. Pipe 51 is open at all times.
  • valve 50 is open and obturator 29 is likewise open.
  • This heat exchanger is rendered operative.
  • Fan 10 delivers atmosphere gas thereinto but this gas encounters no liquid condensation in the exchanger and cannot therefore carry with it an unduly large detrimental proportion of steam, whereby oxidation of the charge is avoided, as would otherwise unfailingly occur during the accelerated cooling period.
  • Circulation of the atmosphere gas through the heat exchanger during this accelerated cooling period is in no way hindered by the small flow of counter-streamed bleed gas continuing to escape through nozzle 52.
  • the heat exchangers could include means other than the coil referred to hereinabove, and could comprise, for instance, multiple clustered tubes of the single or dual flow type and, possibly also, water tubes. Such individual heat exchangers could furthermore be positioned vertically and, instead of being associated to an inlet and an outlet each, could be connected to sets of inlets and outlets. Similarly, a cooling jacket could be used to protect the sealing gland used for the obturator actuating rod. Moreover, flow and temperature measuring instruments could be provided on each circuit.
  • the apparatus hereinbefore described thus enables any proportion of the recirculating atmosphere gas to be bypassed through the cooling heat-exchanger or exchangers; indeed, it would be possible to cause virtually the entire output from the single centrifugal blower to be flowed through such cooling heat-exchanger(s).
  • a heating bell furnace having a base on .which products to be heat-treated are supported, a protective cover enclosing said products, and a recycling fan below said base for circulating an atmosphere gas in the furnace between the center and the periphery thereof via a passageway beneath said base
  • means for selectively cooling said atmosphere gas including at least one heat exchanger for cooling said atmosphere gas, sa-id exchanger having at least one gas inlet located beneath said cover at a location where an overpressure prevails and at least one gas outlet also located beneath said cover at a location where a negative relative pressure prevails whereby a natural flow of gas through said exchanger tends to :be produced, said flow of gas through said exchanger being supplemented by said fan, and a gas duct element retractable in said base and associated with said inlet to selectively direct the circulating gas to said inlet.
  • retractable gas duct element comprises an obturator for blocking said inlet.
  • An improvement as claimed in claim 1 comprising an actuating rod connected to said retractable element to operate the same.
  • An improvement as claimed in claim 1, comprising a flattened nozzle at said heat exchanger outlet.
  • An improvement as claimed in claim 5 comprising deflector means facing said flattened nozzle for the deflection of gas discharged therefrom.
  • said fan includes a fan wheel and a diffuser comprising radial blades extending from said fan wheel, said diffuser having a frusto-conical rim spaced from the protective cover, said inlet being located between the blades at the exit of the diffuser, and said outlet is located between said rim and said protective cover.
  • said heat exchanger comprises a tank of circulating water and a coil submerged in the water in said tank, said coil being connected to said inlet and outlet.
  • An improvement as claimed in claim 9 comprising a condensation detector means at the lowermost point of said coil.
  • An improvement as claimed in claim 1 comprising an actuating rod connected to said retractable element to operate the same, said inlet having a wall with a leakproof guide therein for said rod, said guide comprising a gland housing with an intermediate pressurizing port therein.
  • An improvement as claimed in claim 1 comprising a leakproof sealing valve controlling said outlet.
  • An improvement as claimed in claim 11 comprising a nozzle located upstream of said sealing valve to continuously inject bled ofl gas into the heat exchanger in countercurrent with the flow of gas to said outlet:
  • An improvement as claimed in claim 14 comprising means for conveying the bled gas to said nozzle from a point within the furnace where an overpressure prevails.
  • said fan includes a fan wheel and a diffuser comprising radial blades extending from said fan Wheel, said diffuser having a frusto-conical rim spaced from the protective cover, said inlet being located between the blades at the exit of the diffuser, and said outlet is located between said rim and said protective cover and means for conveying the bled gas to said nozzle from a point located between the blades of said diffuser.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (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)
  • Furnace Details (AREA)
US546301A 1965-05-06 1966-04-29 Bell furnaces for heat-treating coiled strip metal and the like Expired - Lifetime US3424444A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR15984A FR1443248A (fr) 1965-05-06 1965-05-06 Perfectionnements apportés aux fours à cloche de traitement thermique de bobines de tôles et produits analogues
FR29601A FR88545E (fr) 1965-08-27 1965-08-27 Perfectionnements apportés aux fours à cloche de traitement thermique de bobines de tôles et produits analogues

Publications (1)

Publication Number Publication Date
US3424444A true US3424444A (en) 1969-01-28

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US546301A Expired - Lifetime US3424444A (en) 1965-05-06 1966-04-29 Bell furnaces for heat-treating coiled strip metal and the like

Country Status (7)

Country Link
US (1) US3424444A (es)
BE (1) BE679856A (es)
DE (1) DE1943431U (es)
ES (1) ES326425A1 (es)
GB (1) GB1124563A (es)
LU (1) LU50983A1 (es)
NL (1) NL139819B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995005487A1 (de) * 1993-08-19 1995-02-23 Loi Thermprocess Gmbh Verfahren und vorrichtung zum austauschen der atmosphäre in einem haubenglühofen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2628605C3 (de) * 1976-06-25 1980-03-20 Ipsen Industries International Gmbh, 4190 Kleve Einkammer-Anlaßofen
CA2975362A1 (en) 2015-02-06 2016-08-11 Navigo Proteins Gmbh Egfr binding proteins comprising ubiquitin muteins

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938306A (en) * 1931-05-04 1933-12-05 Eastwood Nealley Corp Annealing furnace
US2325677A (en) * 1940-01-23 1943-08-03 Clarence B Hoak Annealing furnace
US2477796A (en) * 1943-01-28 1949-08-02 Westinghouse Electric Corp Heat-treating furnace
US3035824A (en) * 1960-02-24 1962-05-22 Midland Ross Corp Furnace with cooled and recirculated atmosphere
GB930063A (en) * 1958-07-10 1963-07-03 Steel Co Of Wales Ltd Improvements in, or relating to, annealing furnaces
US3169158A (en) * 1961-06-28 1965-02-09 United States Steel Corp Apparatus for annealing coils of steel strip
US3294596A (en) * 1961-02-24 1966-12-27 Daubersy Jean Process and apparatus for annealing thin steel plates
US3302939A (en) * 1964-05-19 1967-02-07 Salem Brosius Inc Industrial furnace cooling system
US3309073A (en) * 1962-03-14 1967-03-14 Heurtey Sa Apparatus for heat treating spools of open-wound metal strip

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938306A (en) * 1931-05-04 1933-12-05 Eastwood Nealley Corp Annealing furnace
US2325677A (en) * 1940-01-23 1943-08-03 Clarence B Hoak Annealing furnace
US2477796A (en) * 1943-01-28 1949-08-02 Westinghouse Electric Corp Heat-treating furnace
GB930063A (en) * 1958-07-10 1963-07-03 Steel Co Of Wales Ltd Improvements in, or relating to, annealing furnaces
US3035824A (en) * 1960-02-24 1962-05-22 Midland Ross Corp Furnace with cooled and recirculated atmosphere
US3294596A (en) * 1961-02-24 1966-12-27 Daubersy Jean Process and apparatus for annealing thin steel plates
US3169158A (en) * 1961-06-28 1965-02-09 United States Steel Corp Apparatus for annealing coils of steel strip
US3309073A (en) * 1962-03-14 1967-03-14 Heurtey Sa Apparatus for heat treating spools of open-wound metal strip
US3302939A (en) * 1964-05-19 1967-02-07 Salem Brosius Inc Industrial furnace cooling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995005487A1 (de) * 1993-08-19 1995-02-23 Loi Thermprocess Gmbh Verfahren und vorrichtung zum austauschen der atmosphäre in einem haubenglühofen

Also Published As

Publication number Publication date
LU50983A1 (es) 1966-06-27
GB1124563A (en) 1968-08-21
NL139819B (nl) 1973-09-17
DE1943431U (de) 1966-08-04
ES326425A1 (es) 1967-03-01
BE679856A (es) 1966-10-03
NL6605954A (es) 1966-11-07

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