US3805010A - Installation of heating by induction - Google Patents

Installation of heating by induction Download PDF

Info

Publication number
US3805010A
US3805010A US00323922A US32392273A US3805010A US 3805010 A US3805010 A US 3805010A US 00323922 A US00323922 A US 00323922A US 32392273 A US32392273 A US 32392273A US 3805010 A US3805010 A US 3805010A
Authority
US
United States
Prior art keywords
inductor
tube
tubes
heated
induction
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
US00323922A
Other languages
English (en)
Inventor
M Cuvelier
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.)
Elphiac SA
Original Assignee
Elphiac 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
Application filed by Elphiac SA filed Critical Elphiac SA
Application granted granted Critical
Publication of US3805010A publication Critical patent/US3805010A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/102—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces the metal pieces being rotated while induction heated

Definitions

  • ABSTRACT This invention relates to an induction heating apparatus for the heating of continuously moving tubes of large diameter and great length.
  • the apparatus is made up of a cylindrical inductor having a series of induction spiral turns through which the tubes move.
  • a shield held stationary with respect to the inductor and disposed between the induction turns and the tubes to be heated is provided therefor.
  • This shield is formed of a plurality of sheet-metal plates which are electrically and thermally insulated from one another along the juxtaposed edges thereof.
  • the position of the inductor is made adjustable with respect to the tubes and in relation to the local heat losses therefrom by means of hydraulic jacks.
  • Feeling prongs and temperature sensitive probes are held close to either one of the inductor end supports to detect any variation in the heat distribution across the tubes whereby to obtain a uniform heat distribution there across by varyingthe inductor position accordingly.
  • This invention relates to an induction heating apparams for heating continuously moving tubes or pipes of large diameters and of great length, the apparatus comprising a cylindrical inductor through which the tubes to be heated move.
  • the object of the present invention is, on the one hand, to protect the inductor against rapid wear casued, for example, by the heat radiated by the heated tube and, onthe other hand, to ensure a uniform temperature throughout the tube section emerging from the inductor.
  • the apparatus according to the invention is characterized by the provision of a shield held stationary with respect to the inductor, between the inductor turns and the tubes to be heated and by the provision of means for adjusting the position of the inductor in relation to the local temperature of the tube.
  • FIG. 1 is a transverse cross-sectional view of the apparatus according to this invention.
  • FIG. 2 is a longitudinal cross section of an inductor used in theapparatus of the present invention.
  • a cylindrical inductor is made up of a series of watercooled spiral turns 1, held between an upstream annular support 2 and a downstream annular support 3 linked together by means of rods 4.
  • the terms upstreamland downstream are meant in relation to the displacement of a tube 5 tobe heated and which moves through the cylindrical inductor from an upstream to a downstream direction.
  • the supports 2 and 3 are made of insulating material, for example of asbestos plates and reinforced by cement.
  • On the inside of the spiral turns 1 of the inductor there are four juxtaposed sheetmetal plates 6,7, 8 and 9, which are pressed against strips 10, made of insulating material, by means of clamps 11. and fixed to the supports 2 and 3.
  • the sheetmetal plates are relatively thin so as not to substantially perturb the inductive field.
  • the sheetcmetal plates 6 to 9 are also electrically and thermically insulated from the turns 1 by strips 10. They are likewise insulated from each other owing to an insulating spacing provided between them, along their juxtaposed edges. To avoid buckling of the plates, strips 10 are inserted along such spaces which also serve to protect the inductor turns from the heat radiated by the heated tube.
  • Means for avoiding buckling of the sheet-metal plates 6 to 9 may be provided.
  • the plates may be crimped or corrugated, or they may be cooled by a refrigerating fluid such as air, nitrogen, water and the like.
  • the refigerating fluid may be scavanged or sprinkled on the plates on the side thereof facing the tube to be heated.
  • appropriate nozzles such as 12 are provided which pass around the downstream support 3 to direct the refrigerating fluid on the surfaces of the plates 6 to 9 or at least on one of the surfaces of the said plates.
  • Cooling'of the plates 6 to 9 may also be performed by forcing the refrigerating fluid through the areas defined by the strips 10, the turns 1 and the plates 6 to 9, or at least some of such areas.
  • appropriate refrigerating fluid conduits, such as 13, are provided in the supports 2 and 3 for connecting these areas with a feeding and, eventually, an outlet refrigerating fluid device, not shown.
  • the inductor When the inductor is disposed horizontally, water splashes on the lower plates are to be feared and to avoid any thermal shock, the plate 6 must be cooled. This partial cooling of the shield, made up of the plates 6 to 9, may produce an uneven distribution of temperature in the portion of the tube running out of the downstream support 3 of the inductor.
  • the inductor is mounted on a cradle 14 the position of which is adjustable by means of hydraulic jacks 15, for vertical motion, and 16 for horizontal motion.
  • These jacks l5 and 16 are parts of a servo-control system that include an hydraulic liquid distributor l7 controlled by a temperature probe measuring system, in relationto the local heat losses in the tube 5 to be heated.
  • the measuring system may be constituted by feeler prongs 18 fixed to one of the supports 2 or 3. In FIG. 2, these prongs 18 are mounted on the upstream support 2.
  • the measuring system may be constituted by probes l9 sensitive to the local temperature of the surface of tube 5. These'probes are secured on the downstream support 3 of the inductor. These probes then give a direct measure of the local temperature along the cross-section of tube 5 emerging from the downstream support 3.
  • the probes 19 or the prongs l8 send out signals useful in the servo-control S(FIG. l toward the liquid .distributors 17. These signals are transmitted through leads 20. If the probes 19 or the prongs 18 are four in number they are preferably arranged along two perpendicular diameters, one vertical, the other horizontal. Thus, the probes 19 or the prongsl8 disposed along the vertical diameter have a direct influence on the positioning of jacks 15 for vertical displacement, and the probes 19 or prongs 18 along thehorizontal diameter directly influence the positioning of the jacks 16 for horizontal displacement.
  • the servo-control system is so designed as to allow the jacks to shift the inductor position until the prongs along the same diameter measure the very same variation from a reference position or until the probes 19 along the same diameter measure the very same temperatures. Owing to this servocontrol system, the parts of the tube surface 5 which endure a more severe loss of heat are submitted to a stronger induction coupling and, hence, to a more intense heating. Thus, a perfectly even temperature distribution is obtained over the full cross-section of the tube 5 emerging from the downstream support 3.
  • the servo control system per se does not constitute claimed subject matter in this case, and may be constructed, for example, in accordance with theservo control systems shown in US. Pat. Nos. 2,998,966 and 3,647,195. Any conventional temperature responsive servo control systems which would provide the desired output function could be used in this invention.
  • An induction heating apparatus for the heating of continuously moving tubes of large diameter and great length, said apparatus including a cylindrical inductor.
  • the inductor Said measuring probes being com claim 1, wherein said heat measur ng probes are lonected to Said servo comrol means to operate Said cated at diametrically opposed POS'IUOI'IIS wth respect to moving mechanism and displace said inductor in the tube being heated, and wherein said servo-control directions perpendicular to its axis and conse means operates said moving mechanisms to shift the ml to the i f h b to b heated, position of said inductor until said probes sense equal h b id i d t i moved closer t h t b local temperatures at diametrical opposite portions of being heated in the area of said tube cross section said tube surface.
  • said probes sense equal h b id i d d t i moved closer t h t b local temperatures at diametrical opposite portions of being heated in the area of said tube cross section said tube surface.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
US00323922A 1972-01-14 1973-01-15 Installation of heating by induction Expired - Lifetime US3805010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE778031A BE778031A (fr) 1972-01-14 1972-01-14 Installation de chauffage par induction.

Publications (1)

Publication Number Publication Date
US3805010A true US3805010A (en) 1974-04-16

Family

ID=3859122

Family Applications (1)

Application Number Title Priority Date Filing Date
US00323922A Expired - Lifetime US3805010A (en) 1972-01-14 1973-01-15 Installation of heating by induction

Country Status (3)

Country Link
US (1) US3805010A (fr)
BE (1) BE778031A (fr)
CA (1) CA971630A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870239A (en) * 1984-11-15 1989-09-26 Rackind Malcolm I Induction heater for drums
US20110186566A1 (en) * 2010-02-01 2011-08-04 Kudu Industries Inc. System and method for induction heating a helical rotor using a coil
US20150131694A1 (en) * 2011-09-20 2015-05-14 Crucible Intellectual Property, Llc Induction shield and its method of use in a system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891657A (en) * 1906-08-09 1908-06-23 Arthur Francis Berry Apparatus for the electrical production of heat for cooking and other purposes.
US2781437A (en) * 1953-09-10 1957-02-12 Magnethermic Corp Induction furnaces
US2813959A (en) * 1955-09-12 1957-11-19 Lombard Corp Billet holding and handling apparatus for electric induction heaters
US2848566A (en) * 1954-02-01 1958-08-19 Smith Corp A O Induction heating apparatus for fusing vitreous enamel
US2969411A (en) * 1957-09-04 1961-01-24 Wild Barfield Electr Furnaces Induction heated furnaces
US3317203A (en) * 1963-10-28 1967-05-02 Union Carbide Corp Radiation shield for induction furnace
US3489875A (en) * 1966-10-27 1970-01-13 Ajax Magnethermic Corp Apparatus for induction heating of slabs
US3647195A (en) * 1970-05-01 1972-03-07 Allis Chalmers Mfg Co Apparatus for and method of controlling rotary kiln operation

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891657A (en) * 1906-08-09 1908-06-23 Arthur Francis Berry Apparatus for the electrical production of heat for cooking and other purposes.
US2781437A (en) * 1953-09-10 1957-02-12 Magnethermic Corp Induction furnaces
US2848566A (en) * 1954-02-01 1958-08-19 Smith Corp A O Induction heating apparatus for fusing vitreous enamel
US2813959A (en) * 1955-09-12 1957-11-19 Lombard Corp Billet holding and handling apparatus for electric induction heaters
US2969411A (en) * 1957-09-04 1961-01-24 Wild Barfield Electr Furnaces Induction heated furnaces
US3317203A (en) * 1963-10-28 1967-05-02 Union Carbide Corp Radiation shield for induction furnace
US3489875A (en) * 1966-10-27 1970-01-13 Ajax Magnethermic Corp Apparatus for induction heating of slabs
US3647195A (en) * 1970-05-01 1972-03-07 Allis Chalmers Mfg Co Apparatus for and method of controlling rotary kiln operation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870239A (en) * 1984-11-15 1989-09-26 Rackind Malcolm I Induction heater for drums
US20110186566A1 (en) * 2010-02-01 2011-08-04 Kudu Industries Inc. System and method for induction heating a helical rotor using a coil
US8723088B2 (en) * 2010-02-01 2014-05-13 Kudu Industries Inc. System and method for induction heating a helical rotor using a coil
US9661691B2 (en) 2010-02-01 2017-05-23 Schlumberger Lift Solutions Canada Limited System and method for induction heating a helical rotor using a coil
US20150131694A1 (en) * 2011-09-20 2015-05-14 Crucible Intellectual Property, Llc Induction shield and its method of use in a system
US9955533B2 (en) * 2011-09-20 2018-04-24 Crucible Intellectual Property, LLC. Induction shield and its method of use in a system

Also Published As

Publication number Publication date
BE778031A (fr) 1972-07-14
CA971630A (en) 1975-07-22

Similar Documents

Publication Publication Date Title
US3789188A (en) Insulated pipe line for heated materials
US3129072A (en) Heat transfer apparatus for continuously moving strip
CA1137191A (fr) Appareil et methode pour la regulation thermique du feuillard
ES469361A1 (es) Ÿperfeccionamientos en crisoles para un horno de fusion de metales en particular un horno de arco electricoŸ
US3414711A (en) Heating roller assembly
US3186694A (en) Temperature control system for jet convection strip heating furnace
US3805010A (en) Installation of heating by induction
GB1524360A (en) Process and apparatus for cooling hotsteel rod
GB1180991A (en) Improvements in the Production of Patented Steel Wire
US3291465A (en) Furnace and burner arrangement for heating steel slabs
GB2127857A (en) Process for producing a grain-oriented electromagnetic steel strip or/sheet
US2638879A (en) Apparatus for heat treatment of fluent substances
US3097836A (en) Ingot heating furnace
US3554168A (en) Furnace apparatus
GB1580932A (en) Induction-heated temperature equalization furnace or zone
US3445096A (en) Thermoplastic parison heating
CA1042324A (fr) Methode et materiel pour le traitement thermique de tuyaux soudes
US2573019A (en) Strip metal heat-treating
US5224539A (en) Cooling system for air heaters and the like
US3182982A (en) Infra-red wire annealing apparatus
KR20000041625A (ko) 고온선재의 냉각방법
US4621794A (en) Apparatus for producing a grain-oriented electromagnetic steel strip or sheet
US3573118A (en) Methods and apparatus for handling wire rod
JPS5588921A (en) Steel sheet cooler in hot strip mill
JPS56102521A (en) Heating method for steel pipe