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US 9,435,562 B2Granted
Electric heating device for heating fluids
AssigneeBorgWarner Ludwigsburg GmbH
InventorsThomas Giffels, Helmut Mueller, Ralph Waechter, Michael Stoerzinger, Bernd Halbrock, Alexander Dauth, Klaus Lehmann
Life of this patent
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Abstract
The invention relates to a electric heating device for heating fluids, comprising at least one heating resistor, a screw, which defines a helical flow channel, and a tube housing, which surrounds the screw. In accordance with this disclosure, the screw has a core in which the at least one heating resistor is arranged.
Claims23
An electric heating device for heating fluids, comprising:
- at least one heating resistor;
- a screw, which defines a helical flow channel;
- and
- a tube housing, which surrounds the screw;
- wherein the heating resistor is a ceramic PTC element and is part of an assembly including a frame and a contact plate, the PTC element being held by the frame and the frame being fastened to the contact plate, the screw having a cavity with a strip-shaped cross-section complementary to the assembly and the assembly being arranged in the cavity.
2 more elements
An electric heating device, comprising:
- a tubular housing;
- a screw which is arranged in the housing such that a helical flow channel for a fluid is provided in the housing;
- a frame having at least one electrical heating resistor arranged inside a core of the screw;
- and
- a contact plate to which the frame is fastened;
- wherein the screw has flanks which have a thickness that decreases in a radially outward direction, further wherein the helical flow channel is delimited on a radially inner side by an inwardly rounded wall.
3 more elements
Dependencies are inferred from the claim text.