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US 11,619,421 B2Granted
Continuous-flow heater, and a method for the manufacture of a continuous-flow heater
AssigneeBorgWarner Ludwigsburg GmbH
InventorsRobert Chu, Rob Zheng
Life of this patent
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Abstract
A continuous-flow heater is described, with a housing made from an aluminium-based alloy, in which a flow channel for a fluid to be heated extends from an inlet to an outlet, and a heating plate which is arranged in the housing, with a substrate made from steel, which carries heating conductor tracks, a frame embedded in a wall of the housing, wherein the heating plate forms one wall of the flow channel in the housing, and is welded to the frame.
Claims9
A continuous-flow heater, comprising:
- a housing made from an aluminium-based alloy;
- a flow channel for a fluid to be heated extending in the housing from an inlet to an outlet;
- a heating plate arranged in the housing and having a substrate made from steel that carries heating conductor tracks;
- and
- a frame embedded in a wall of the housing, wherein the heating plate forms a wall of the flow channel and is welded to the frame;
- wherein the frame is formed from a material having a coefficient of thermal expansion between the coefficient of thermal expansion of the aluminium-based alloy of the housing and the coefficient of thermal expansion of the steel of the substrate of the heating plate.
3 more elements
A method for the manufacture of a continuous-flow heater, the method comprising:
- inserting a frame into a mold, the frame having a first coefficient of thermal expansion;
- casting an aluminium-based alloy in the mold and thereby making the frame embedded in a housing section, the housing section having a second coefficient of thermal expansion different than the first coefficient of thermal expansion;
- and
- providing a heating plate having a steel substrate carrying heating conductor tracks and welding the heating plate to the frame, wherein the heating plate has a third coefficient of thermal expansion that is different from the first and second coefficients of thermal expansion,
- wherein the first coefficient of thermal expansion has a value between the second and third coefficients of thermal expansion.
2 more elements
Dependencies are inferred from the claim text.