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US 11,698,012 B2Granted
Exhaust gas heating element
AssigneePurem GmbH
InventorGerd Gaiser
Life of this patent
Estimating the term…
Abstract
An exhaust gas heating unit for an exhaust system of an internal combustion engine includes a jacket heating conductor element (12) with a jacket (16) and with an electrical heating conductor (14). The electrical heating conductor (14) extends in the jacket (16) and is surrounded by insulating material (18). A heat transfer surface formation (20) is arranged on an outer side of the jacket (16) and is in heat transfer contact with same.
Claims12
An exhaust system for an internal combustion engine, the exhaust system comprising:
- an exhaust gas flow duct for a flow of exhaust gas in an exhaust gas flow direction;
- and
- at least one exhaust gas heating unit arranged in the exhaust gas flow duct, the exhaust gas heating unit comprising:
- a jacket heating conductor element comprising a jacket, an electrical heating conductor extending in the jacket, and insulating material surrounding the electrical heating conductor;
- and
- a heat transfer surface formation arranged on an outer side of the jacket and in heat transfer contact with the jacket, wherein the heat transfer surface formation comprises a heat transfer element extending along the jacket heating conductor element such as to helically surround the jacket heating conductor element in at least some areas, the jacket heating conductor element having two ends for electrically connecting the jacket heating conductor element to a voltage source outside the exhaust gas flow duct, the jacket heating conductor element being arranged with a spiral form, wherein the jacket heating conductor element helically surrounded by the heat transfer element is arranged in a double-spiral winding configuration in a plane that is essentially at right angles to the exhaust gas flow direction, such that the two ends of the jacket heating conductor element are positioned in the same length area of the exhaust gas flow duct in the exhaust gas flow direction.
3 more elements
An exhaust system for an internal combustion engine, the exhaust system comprising:
- an exhaust gas flow duct for a flow of exhaust gas in an exhaust gas flow direction;
- and
- at least one exhaust gas heating unit arranged in the exhaust gas flow duct, the exhaust gas heating unit comprising:
- a jacket heating conductor element comprising a jacket, two electrical heating conductors extending in the jacket next to one another, and insulating material surrounding the electrical heating conductors;
- and
- a heat transfer surface formation arranged on an outer side of the jacket and in heat transfer contact with the jacket, wherein the heat transfer surface formation comprises a heat transfer element extending along the jacket heating conductor element such as to helically surround the jacket heating conductor element in at least some areas, the jacket heating conductor element having a first end for electrically connecting the two electrical heating conductors to a voltage source outside the exhaust gas flow duct, the jacket heating conductor element being arranged with a spiral form, wherein the jacket heating conductor element helically surrounded by the heat transfer element is arranged in a single-spiral winding configuration in a plane that is essentially at right angles to the exhaust gas flow direction, the jacket heating conductor element having a second end positioned in a central area of the single-spiral configuration, the two electrical heating conductors merging into one another at the second end of the jacket heating conductor element.
3 more elements
Dependencies are inferred from the claim text.