Skin-effect based heating cable, heating unit and method
OwnerMikhail Leonidovich Strupinskiyinventor
Life of this patent
Estimating the term…
Abstract
The invention relates to the skin-effect based induction-resistive heating units and can be used in devices intended for prevention of paraffin-hydrate deposits formation in oil-and-gas wells and pipelines, as well as for warming up of viscous products in pipelines and vessels for the purpose of their transporting and pumping. The skin-effect based heating cable contains the center conductor, the inner insulation layer and the ferromagnetic outer conductor coaxially located around them. The invention enables to simplify using due to increase of the heating cable flexibility and due to reduce the energy consumption at its operation.
Claims11
A heating cable comprising:
- a center conductor comprising a helically twisted non-ferromagnetic conductor;
- an inner insulation layer coaxially located around the center conductor;
- a ferromagnetic outer conductor coaxially located around the center conductor and around the inner insulation layer;
- and
- a layer of non-ferromagnetic conductor in electric contact with the outer conductor coaxially located between the outer conductor and the inner insulation layer,
- wherein the inner insulation layer is made of a polymer material;
- wherein the outer conductor comprises a corrugated ferromagnetic tube;
- wherein the ferromagnetic tube has wall thickness less than three skin-effect depths at an operating frequency.
Dependencies are inferred from the claim text.