CA1080291A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Heating apparatus partly equipped with skin effect heat-generating pipe
Assignee: JNC Engineering Co Ltd
•
Filing: 1978-04-03
•
Granted: 1980-06-24
•
Expires: 1998-04-03
Abstract
Abstract Abstract of the Disclosure For heating a lengthy to-be-heated material which requires different heat quantities in the longitudinal direction thereof, there is provided a heat-generating pipe of induction type skin effect current along the first parts of said to-be-heated material which require relatively large heat quantities and in which parts the insulated wires are placed in the inside of said heat-generating pipes,and along the second parts of said to-be-heated material which require relatively small heat quantities, the portions of the insulated wires are disposed outside said heat-generating pipes as extension from the inside of said heat-generating pipes of the above-mentioned first parts.
Inventors
- 👤 Masao Ando
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-05 22:38
CPC Classifications
—
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
262 words
A heating apparatus for a to-be-heated long material requiring different heat quantities along the longitudinal direction comprising (a) at least one ferromagnetic pipe or at least one set of ferromagnetic pipes or both disposed in the longitudinal direction of at least one part of said to-be-heated material requiring a comparatively large heat quantity to form a secondary induction circuit and (b) at least two rows of insulated electric wire passed through said ferromagnetic pipe or respective ferromagnetic pipes and connected with an alternating current source to form a primary circuit, (c) said at least one ferromagnetic pipe or at least one set of ferromagnetic pipes, respectively forming a heat-generating pipe of an induction type skin effect current with said insulated wire by having a means for connecting both the ends of said pipe or pipes in such a way that a secondary current induced in said pipe or pipes by the primary current flowing in said insulated wire concentrates on and flows through only the inner skin portion of said pipe or pipes and further by having such a thickness that the induced voltage forming said secondary current substantially does not appear on the outer surface thereof, and (d) said at least two rows of insulated wires having at least one part extending outside said pipe or pipes which part is disposed along the longitudinal direction of at least one of the parts of said to-be-heated material requiring a comparatively small heat quantity or requiring no heat at all and is passed through one ferromagnetic pipe or at least one non-magnetic pipe.
Claim 2
Dependent Claim
262 words
A heating apparatus for a to-be-heated long material requiring different heat quantities along the longitudinal direction comprising (a) at least one ferromagnetic pipe or at least one set of ferromagnetic pipes or both disposed in the longitudinal direction of at least one part of said to-be-heated material requiring a comparatively large heat quantity to form a secondary induction circuit and (b) at least two rows of insulated electric wire passed through said ferromagnetic pipe or respective ferromagnetic pipes and connected with an alternating current source to form a primary circuit, (c) said at least one ferromagnetic pipe or at least one set of ferromagnetic pipes, respectively forming a heat-generating pipe of an induction type skin effect current with said insulated wire by having a means for connecting both the ends of said pipe or pipes in such a way that a secondary current induced in said pipe or pipes by the primary current flowing in said insulated wire concentrates on and flows through only the inner skin portion of said pipe or pipes and further by having such a thickness that the induced voltage forming said secondary current substantially does not appear on the outer surface thereof, and (d) said at least two rows of insulated wires having at least one part extending outside said pipe or pipes which part is disposed along the longitudinal direction of at least one of the parts of said to-be-heated material requiring a comparatively small heat quantity or requiring no heat at all and is passed through one ferromagnetic pipe or at least one non-magnetic pipe.
Claim 3
Dependent Claim
57 words
A heating apparatus described in Claim 1 wherein said to-be-heated material is a pipeline at least one part of which is buried under the ground, the other part or parts are installed on the ground, and a heat-generating pipe of an induction type skin effect current is provided on at least said one part on the ground.
Claim 4
Dependent Claim
71 words
A heating apparatus described in Claim 1 wherein said to-be-heated material is the environmental ground area surrounding a pipeline, said pipeline is buried under the ground passing through two kinds of ground areas one of which is a permafrost ground area and the other repeats freezing and melting all the year round and an induction type skin effect current heating pipe is provided on said area which repeats freezing and melting.
Claim 5
Dependent Claim
57 words
A heating apparatus described in Claim 1, 2 or 3 wherein the insulation layer and/or the material and/or cross-sectional area of conductor of the insulated wires are different between the parts disposed inside the ferro-magnetic pipe of said skin effect current heating pipe and the other parts extending from the inside parts and disposed outside said pipe.
Claim 6
Dependent Claim
31 words
A heating apparatus described in Claim 1, 2, 3 or 4 having at least two said skin effect current heating pipes being electrically connected with each other to form one body.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.