GB776913A - Method of and apparatus for controlling circulation of furnace atmosphere - Google Patents

Method of and apparatus for controlling circulation of furnace atmosphere

Info

Publication number
GB776913A
GB776913A GB28826/55A GB2882655A GB776913A GB 776913 A GB776913 A GB 776913A GB 28826/55 A GB28826/55 A GB 28826/55A GB 2882655 A GB2882655 A GB 2882655A GB 776913 A GB776913 A GB 776913A
Authority
GB
United Kingdom
Prior art keywords
coils
plate
cover
plates
atmosphere
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
Application number
GB28826/55A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB28826/55A priority Critical patent/GB776913A/en
Publication of GB776913A publication Critical patent/GB776913A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54Furnaces for treating strips or wire
    • C21D9/663Bell-type furnaces

Landscapes

  • 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)

Abstract

776,913. Furnaces for heat-treating metals. WILSON, L. Oct. 10, 1955 [Nov. 5, 1954], No. 28826/55. Class 51 (2). In a furnace for the heat treatment of metals, e.g. the annealing of steel &c. strip, of the kind in which spaced, superposed coils of strip are enclosed in a cover 25, Fig. 1, within a bell F heated by combustion tubes lining the wall of the bell and supplied with oil and air through manifolds 3, 4, respectively, and in which the atmosphere within the cover is circulated over the coils by a centrifugal fan 9 driven by an electric motor, the coils are supported upon a base S constituting a diffuser unit for the fan and formed of vanes 15, Fig. 2, disposed between plates 14, 16 enclosed by a rim 17, said vanes having attached to their inner ends bimetal plates 28 which restrict the output of the fan while the furnace is warming up, and which flex and lie against the vanes when the annealing temperature is reached and permit increased circulation of the atmosphere within the cover. The atmosphere flows through an annular space 18 between the plate 16 and the rim 17 over the outsides of the coils and through the spaces between the coils and down the centres of the coils back to the fan. The cover has an outlet for circulating atmosphere so that the pressure within the cover remains substantially constant as the temperature rises. In a modification, the circulation is controlled by a movable plate 31, Fig. 5, which coacts with an apertured plate 30 placed over the central passage formed by the superposed coils and attached to a bellows 36, the lower end of which is secured to a plate 35 carried by bolts 34 mounted on webs 33 integral with the plate 30. As the temperature rises, the plate 31 is moved by the free end of the bellows towards the dotted line position. In another arrangement, the circulation is controlled by counterweighted flaps 42, Fig. 6, coacting with apertures 41 in a plate covering the top of the central passage through the coils. Fig. 8 shows a further modification in which the flow is controlled by fixed and rotatable apertured plates 47, 48 respectively and in which the inner plate 48 is rotated by a biinetal strip 55 secured at one end to the plates and at the other to a fixed bar 54. The plates are closed by a cover, not shown.
GB28826/55A 1955-10-10 1955-10-10 Method of and apparatus for controlling circulation of furnace atmosphere Expired GB776913A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB28826/55A GB776913A (en) 1955-10-10 1955-10-10 Method of and apparatus for controlling circulation of furnace atmosphere

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28826/55A GB776913A (en) 1955-10-10 1955-10-10 Method of and apparatus for controlling circulation of furnace atmosphere

Publications (1)

Publication Number Publication Date
GB776913A true GB776913A (en) 1957-06-12

Family

ID=22139518

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28826/55A Expired GB776913A (en) 1955-10-10 1955-10-10 Method of and apparatus for controlling circulation of furnace atmosphere

Country Status (1)

Country Link
GB (1) GB776913A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114150116A (en) * 2021-12-03 2022-03-08 苏州万喜达精密钢带有限公司 Cover type annealing furnace
CN114799165A (en) * 2022-04-28 2022-07-29 江苏华普干燥工程有限公司 Box type sintering furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114150116A (en) * 2021-12-03 2022-03-08 苏州万喜达精密钢带有限公司 Cover type annealing furnace
CN114799165A (en) * 2022-04-28 2022-07-29 江苏华普干燥工程有限公司 Box type sintering furnace

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