US3622731A - Flexible heat-generating device - Google Patents

Flexible heat-generating device Download PDF

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Publication number
US3622731A
US3622731A US45282A US3622731DA US3622731A US 3622731 A US3622731 A US 3622731A US 45282 A US45282 A US 45282A US 3622731D A US3622731D A US 3622731DA US 3622731 A US3622731 A US 3622731A
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US
United States
Prior art keywords
rings
generating device
conductor line
flexible heat
heat
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
US45282A
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English (en)
Inventor
Masao Ando
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.)
JNC Corp
Original Assignee
Chisso Corp
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Filing date
Publication date
Application filed by Chisso Corp filed Critical Chisso Corp
Application granted granted Critical
Publication of US3622731A publication Critical patent/US3622731A/en
Anticipated expiration legal-status Critical
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    • 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
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor

Definitions

  • a flexible heat-generating device is constructed by stringing a great number of mutually independent ferromagnetic rings around an insulated conductor line, and heat is generated by the secondary eddy current loss induced upon said rings when an AC current is applied to said conductor line.
  • This invention relates to a flexible'heat-generating device which utilizes the eddy current loss of highly magnetic steel mass.
  • a skin-effect current heat-generating pipe such as that shown in FIG. 1, consisting of a highly ferromagnetic pipe I, a conductor line 2 which is passed through the inside of said pipe and connected with an AC supply source 5, and another conductor 2 connecting the ends of said pipe together to form an electric circuit whereby current 4' is connected only in the inner skin portion of said pipe, is already known, e.g. by the disclosure of US. Pat. No. 3,5 l5,837 filed by the present inventor entitled Heat Generating Pipe.”
  • the known heat-generating pipe shown in FIG. 1 has been demonstrating superior performance in the pipe line heating and heating of road surfaces or the like but since the heatgenerating pipe must be a steel pipe having a thickness greater than a certain definite value, it has almost no flexibility. This often inconvenience e.g. relative to the expansion of the pipe.
  • the object of the present invention can be attained by a flexible heat-generating device wherein a conductor line is inserted in the inside of a large number of independent ferromagnetic rings in a manner of skewering the rings and AC is passed through said conductor line to generate heat by the secondary eddy current loss in said rings.
  • FIGS, la and 1b are schematic cross sectional views of a prior art heat arrangement which utilizes skin-effect heating
  • FIG. 2a is a view, partly in section, of one embodiment of my invention.
  • FIG. 2b is a view along IIbIIb of FIG. 2a;
  • FIG. 3a is a view, partly in section, of another embodiment of my invention.
  • FIG. 3b is a view along IIIb-IIIb of FIG. 3a.
  • PREFERRED EMBODIMENT OF THE INVENTION F IG. 1 is typical of the known skin-effect current heatgenerating pipes and shows an insulated conductor 2 that forms a primary closed circuit while a ferromagnetic pipe 1 forms a secondary circuit along with another conductor 2'.
  • a secondary current 4' flows only through the inner wall portion of the ferromagnetic pipe by the induction from a primary current 4 to generate heat therein.
  • numerals 6 and II are highly ferromagnetic materials, e.g. steel rings.
  • conductor lines 7 and 12 having insulation layers 8 and 13 are inserted in a manner of skewering the rings.
  • the cross-sectional area of the ring 6 in FIG. 2 is circular and that of the ring 11 in FIG. 3 is cylindrical but those of various other shapes such as elliptical or polygonal one can also be used.
  • the ring 6 or 11 By the eddy current 9 or 14', the ring 6 or 11 generates heatbut since a large number of rings such as 6 of I l are independent without being mechanically connected to each other and the conductor line 7 or 12 is naturally flexible, it is possi ble to give necessary flexibility to the device.
  • the diameter d (cm.) in case of the ring 6 having the circular cross section as in FIG. 2, and the thickness! (cm.) in case of the cylindrical ring 11 as in FIG. 3, must be greater than about two to three times the depth S (cm.) of the skin of the eddy current.
  • the depth of the skin can be expressed by
  • the thickness r (cm.) of the steel pipe I is more than twice the S shown in the formula I, it is a characteristic fact that AC 4 concentrates only on the inner skin portion of the steel pipe I and does not practically appear on the outer skin portion of the steel pipe 1.
  • a ring 6 has an oxide coating in its commonly used state, and this oxide coating is a semiconductive substance having a resistivity considerably higher than, e.g. steel, the electric potential of the rings cannot be developed into a cumulative amount by the above-mentioned value of 5 to 15 mv. measured between the mutually neighboring rings. Accordingly, even if the number of rings skewered through the conductor line reaches several hundred, or even several ten-thousands, and they are contacting with a metallic mass e.g. a steel oil transportation pipe, the leakage of electric current to said metallic mass does not occur.
  • a metallic mass e.g. a steel oil transportation pipe
  • the flexible heat-generating device of the present invention may be used in the heating ofliquid which is liable to be solidified and being sent through a flexible transportation pipe e.g. a rubber hose.
  • a flexible transportation pipe e.g. a rubber hose.
  • the rubber hose itself is an insulating material, there is no apprehension of the above-mentioned leakage of electric current at all.
  • FIGS. 2 and 3 whereas the rings having the same shape and size are shown with the conductor lines 7 and 12 it is possible, in some cases, to skewer two or more rings having different shapes and sizes adequately with a conductor line.
  • FIGS. 2 and 3 it is also possible to insert spacers or distance 10 and l 5 pieces between neighboring rings such as those made of plastics, elastic rubber, porcelain, asbestos and other electric insulation materials.
  • a plurality of separate but closely adjacent highly ferromagnetic rings disposed in side-by-side relationship along the length of said insulated conductor line, said insulated conductor line passing centrally through each of said ferromagnetic rings, whereby, when alternating current is passed through said insulated conductor line, the resulting eddy currents cause heat to be generated in said rings.
  • a flexible heat-generating device according to claim 1 wherein at least some of said rings are spaced apart by nonconductive spacers.
  • a flexible heat-generating device according to claim 1 wherein each of said rings is covered with a layer of insulation.
  • each of said rings is covered with a layer of insulation.
  • a flexible heat-generating device according to claim 1 wherein said rings have a circular cross section.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Resistance Heating (AREA)
  • General Induction Heating (AREA)
US45282A 1969-07-04 1970-06-11 Flexible heat-generating device Expired - Lifetime US3622731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44052916A JPS493090B1 (enrdf_load_stackoverflow) 1969-07-04 1969-07-04

Publications (1)

Publication Number Publication Date
US3622731A true US3622731A (en) 1971-11-23

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ID=12928142

Family Applications (1)

Application Number Title Priority Date Filing Date
US45282A Expired - Lifetime US3622731A (en) 1969-07-04 1970-06-11 Flexible heat-generating device

Country Status (5)

Country Link
US (1) US3622731A (enrdf_load_stackoverflow)
JP (1) JPS493090B1 (enrdf_load_stackoverflow)
DE (1) DE2030924B2 (enrdf_load_stackoverflow)
FR (1) FR2056350A5 (enrdf_load_stackoverflow)
GB (1) GB1253172A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780250A (en) * 1971-11-02 1973-12-18 Chisso Corp Apparatus for heating the surface of constructions
US4408117A (en) * 1980-05-28 1983-10-04 Yurkanin Robert M Impedance heating system with skin effect particularly for railroad tank cars
US4795885A (en) * 1986-05-16 1989-01-03 Westinghouse Electric Corp. Flexible radiant tube heater
US6310334B1 (en) * 1997-09-04 2001-10-30 Na Corporation Surface current heating apparatus having spaced-apart hollow heat generating members with conductor extending therethrough
US20180010723A1 (en) * 2016-05-16 2018-01-11 Pentair Thernal Management LLC High Voltage Skin Effect Trace Heating Cable Isolating Radial Spacers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4717814A (en) * 1983-06-27 1988-01-05 Metcal, Inc. Slotted autoregulating heater

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US444477A (en) * 1891-01-13 Chusetts
US3515837A (en) * 1966-04-01 1970-06-02 Chisso Corp Heat generating pipe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US444477A (en) * 1891-01-13 Chusetts
US3515837A (en) * 1966-04-01 1970-06-02 Chisso Corp Heat generating pipe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780250A (en) * 1971-11-02 1973-12-18 Chisso Corp Apparatus for heating the surface of constructions
US4408117A (en) * 1980-05-28 1983-10-04 Yurkanin Robert M Impedance heating system with skin effect particularly for railroad tank cars
US4795885A (en) * 1986-05-16 1989-01-03 Westinghouse Electric Corp. Flexible radiant tube heater
US6310334B1 (en) * 1997-09-04 2001-10-30 Na Corporation Surface current heating apparatus having spaced-apart hollow heat generating members with conductor extending therethrough
US20180010723A1 (en) * 2016-05-16 2018-01-11 Pentair Thernal Management LLC High Voltage Skin Effect Trace Heating Cable Isolating Radial Spacers

Also Published As

Publication number Publication date
GB1253172A (enrdf_load_stackoverflow) 1971-11-10
DE2030924A1 (de) 1971-02-04
DE2030924B2 (de) 1971-09-23
FR2056350A5 (enrdf_load_stackoverflow) 1971-05-14
JPS493090B1 (enrdf_load_stackoverflow) 1974-01-24

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