US3661371A - Convector plates - Google Patents

Convector plates Download PDF

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Publication number
US3661371A
US3661371A US36559A US3661371DA US3661371A US 3661371 A US3661371 A US 3661371A US 36559 A US36559 A US 36559A US 3661371D A US3661371D A US 3661371DA US 3661371 A US3661371 A US 3661371A
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US
United States
Prior art keywords
support members
convector
plate
gas
convector plate
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Expired - Lifetime
Application number
US36559A
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English (en)
Inventor
Leslie George Victor Skelton
Godfrey Hunt Thomas
Hedley Brynmor Jenkins
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SKELTON THOMAS Ltd
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SKELTON THOMAS Ltd
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Filing date
Publication date
Application filed by SKELTON THOMAS Ltd filed Critical SKELTON THOMAS Ltd
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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

Definitions

  • the invention relates to convector plates of the kind which are placed between vertically stacked metal coils in heat treatment furnaces, for example annealing furnaces. Such annealing furnaces generally incorporate an enclosing cover or hood,
  • a convector plate for use in heat-treatment furnaces comprising a plurality of gas passages extending across each face of the plate, the passages in one face being substantially parallel, and each gas passage having substantially parallel walls.
  • a convector plate for use in heat treatment furnaces which comprises a plurality of support members forming a grid which defines a set of substantially parallel gas passages extending across the plate.
  • each face of the plate Preferably there may be two sets of each face of the plate.
  • the total area of the gas passages in one face may amount to approximately 50 percent of the surface area of that face.
  • each support member may comprise a metal bar.
  • the metal may be mild or cast steel or aluminum, or an alloy.
  • one set of gas passages in one face may be at right angles to the set of gas passages in the other face.
  • the bars forming the grid may be arranged symmetrically to minimize distortion during operation and to minimize the.possibility of failure during repeated heating and cooling cycles within an annealing furnace.
  • the plate may be approximately circular in shape, with a central orifice or vent which is also circular.
  • a number of lugs, a central ring, or other convenient lifting means may be attached to the plate, depending on the handling equipment available.
  • two lugs may be secured to the support members so that they are diametrically disposed with respect to the vent, on the circumference of the vent. These lugs facilitate the use of lifting equipment for handling the convector plates into and out of the annealing furnace.
  • FIG. 1 shows a plan view of an arrangement of base plates of one embodiment of convector plate
  • FIG. 2 is a plan view of an arrangement of top plates of one embodiment of convector plate
  • F IG. 3 shows a plan view of another embodiment of convector plate
  • FIG. 4 shows a view in the direction of the arrow A in FIG.
  • FIG. 5 shows a plan view of a further embodiment of convector plate
  • FIG. 6 shows a sectional view of part of an annealing furnace in which the convector plate of FIGS. 3, 4 or 5 is utilized.
  • a set 1 of base plates (FIG. 1) is of generally circular configuration and comprises a plurality of parallel fiat steel bars'2 of non-uniform width.
  • Parallel air passages 3 are defined by the bars 2.
  • Two central bars 4 are welded to a circular supporting ring 5 which is also welded to bars in the set 1 immediately adjacent the bars 4 on each side thereof.
  • a set 6 of top plates is also of generally circular configuration and comprises a plurality of parallel, flat steel bars 7 of varying widths. Two central pairs 8 of bars are welded to a support ring 9. The set 6 of bars defines a plurality of parallel air passages 10.
  • a convector plate according to the invention comprises a combination of the sets 1 and 6 of base and top plates, which are placed one on top of the other with their respective bars 2 and 7 at right angles to one another and with the two support rings 5 and 9 in verticalalignment. The two sets are then welded together to provide a rigid and stable structure having a central vent.
  • a convector plate 11 illustrated therein is similar to that described above, with the modification that central bars l2, l3, l4 and 15 and the bars l6, l7, l8 and 19 are shaped to provide a central vent 20 in the plate 11.
  • a lifting lug 21 is secured between the bars 12 and 13, a diametrically opposed lug 22 being likewise secured to the bars 14 and 15.
  • FIG. 5 a convector plate 23 similar to that described with reference to FIGS. 1 to 4, is illustrated, and includes four lifting lugs 24.
  • the bars maybe of mild steel, aluminum, or any suitable material depending onthe metal which is being treated in the annealing furnace utilizing the convector plates.
  • the bars may be of any convenient dimension, for example 6 inch wide and three-fourth inch thick.
  • coils 25 of metal which may be sheet steel are stacked one on top of the other in an annealing furnace X with the convector plate 11 separating each coil (see FIG. 6).
  • An annealing or protective gas is circulated by a fan 26 through the furnace, which is maintained at a predetermined temperature.
  • the gas passes down the air passages 3 and 10 into the central vent 20, from which it is recirculated.
  • the parallel sides of the air passages ensure that the gas has an uninterrupted flow over the coils so that the rate of heat input by convection, conduction and radiation to the coils is increased.
  • the annealing gas is able to pass to the center of the coils through the vent.
  • the coils and convector plates are removed from the furnace by engaging lifting tackle with the lifting ring or lugs.
  • the non-uniform width of the bars is to accommodate differing widths of coils to be annealed, so that the entire peripheries of such coils are supported during the annealing treatment.
  • the convector plates according to the invention thus provide improved convection in the annealing furnace and an improvement in tons treated per hour of furnace use. It has also been found that the convector plates according to the invention result in a saving of three to four hours in cooling time per charge and an improvement in furnace performance, such as in fuel and HNX gas consumption, while a further desirable feature is that coil edge damage is reduced considerably due to the support afforded by the plates.
  • a convector plate for use in heat treatment furnaces comprising a plate of substantially circular configuration with an upper and a lower surface, wherein the upper surface is defined by a plurality of spaced apart support members and the lower surface is defined by a plurality of spaced apart support members located mutually at right angles with the support members of the upper surface, the spaced apart support members of each surface defining a plurality of open passages for passage of gas.
  • a convector plate for use in heat treatment furnaces comprising a plate of substantially circular configuration with an upper and a lower surface and central vent means, wherein the upper surface is defined by a plurality of spaced-apart support members and the lower surface is defined by a plurality of spaced-apart support members located mutually at right angles withthe support members of the upper surface, the spaced-apart support members of each surface defining a plurality of open passages for passage of gas.
  • a convector plate according to claim 3 in which diametrically opposed central gas passages in the upper and lower surface communicate directly with the vent means.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Articles (AREA)
US36559A 1969-05-13 1970-05-12 Convector plates Expired - Lifetime US3661371A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB24379/69A GB1285461A (en) 1969-05-13 1969-05-13 Convector plates

Publications (1)

Publication Number Publication Date
US3661371A true US3661371A (en) 1972-05-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US36559A Expired - Lifetime US3661371A (en) 1969-05-13 1970-05-12 Convector plates

Country Status (8)

Country Link
US (1) US3661371A (xx)
AU (1) AU1498070A (xx)
CA (1) CA939142A (xx)
DE (1) DE2023213A1 (xx)
FR (1) FR2047683A5 (xx)
GB (1) GB1285461A (xx)
NL (1) NL7006956A (xx)
ZA (1) ZA703230B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879167A (en) * 1974-04-18 1975-04-22 Jones & Laughlin Steel Corp Non-warping heat shield
US3939296A (en) * 1974-09-24 1976-02-17 Armco Steel Corporation Annealing furnace base plate supports
US20060290057A1 (en) * 2005-06-27 2006-12-28 Savita Games Inc. Layered board game

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009048797B3 (de) * 2009-10-08 2011-03-03 Wieland-Werke Ag Wärmebehandlungsanlage und Verfahren zur Wärmebehandlung von Einsatzgut

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3415506A (en) * 1966-04-06 1968-12-10 Calvin C. Blackman Coil spacer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3415506A (en) * 1966-04-06 1968-12-10 Calvin C. Blackman Coil spacer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879167A (en) * 1974-04-18 1975-04-22 Jones & Laughlin Steel Corp Non-warping heat shield
US3939296A (en) * 1974-09-24 1976-02-17 Armco Steel Corporation Annealing furnace base plate supports
US20060290057A1 (en) * 2005-06-27 2006-12-28 Savita Games Inc. Layered board game
WO2007000044A1 (en) * 2005-06-27 2007-01-04 Savita Games Inc. Layered board game

Also Published As

Publication number Publication date
AU1498070A (en) 1971-11-18
CA939142A (en) 1974-01-01
NL7006956A (xx) 1970-11-17
ZA703230B (en) 1971-02-24
FR2047683A5 (xx) 1971-03-12
DE2023213A1 (de) 1970-11-26
GB1285461A (en) 1972-08-16

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