# US 9,435,562 B2 · Electric heating device for heating fluids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,562 B2 - Document ID: US9435562B2 - Status: Granted - Kind: B2 - Application number: 13/962,436 - Filed: 2013-08-08 - Published: 2014-02-20 - Granted: 2016-09-06 - Earliest claimed: 2012-08-20 - Assignees: BorgWarner Ludwigsburg GmbH - Applicants: BorgWarner BERU Systems GmbH - Inventors: Thomas Giffels; Helmut Mueller; Ralph Waechter; Michael Stoerzinger; Bernd Halbrock; Alexander Dauth; Klaus Lehmann - Web page: https://patentgrep.com/patent/US9435562B2 ## CPC - F24H 1/103: {with bare resistances in direct contact with the fluid} - B60H 1/2221: {arrangements of electric heaters for heating an intermediate liquid (B60H1/034 takes precedence)} - F24H 1/009: {for vehicle systems} - F24H 1/102: {with resistance} - F24H 9/0015: {in water channels} - H05B 3/22: non-flexible - H05B 3/42: non-flexible - B60H 2001/2271: {Heat exchangers, burners, ignition devices} - F24H 2250/04: Positive temperature coefficients [PTC]; Negative temperature coefficients [NTC] - H05B 2203/02: Heaters using heating elements having a positive temperature coefficient - H05B 2203/021: Heaters specially adapted for heating liquids - F24H: FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL (steam generation F22) - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The heating device according to claim 1, wherein the screw is made of metal. ### Claim 3 (depends on 1) The heating device according to claim 1, wherein the tube housing is made of plastic. ### Claim 4 (depends on 1) The heating device according to claim 1, wherein the at least one heating resistor comprises multiple PTC elements and the frame has compartments, each PTC element being arranged in a respective one of the compartments. ### Claim 5 (depends on 1) The heating device according to claim 1, wherein the cavity comprises a longitudinal cavity wherein the longitudinal direction of the cavity is in the longitudinal direction of the screw. ### Claim 6 (depends on 5) The heating device according to claim 5, wherein the cavity is arranged in the middle of the screw. ### Claim 7 (depends on 5) The heating device according to claim 5, wherein a rear face of the contact plate faces away from the at least one heating resistor and is electrically insulated from the screw via an insulation layer. ### Claim 8 (depends on 5) The heating device according to claim 5, wherein one side of the at least one heating resistor is electrically contacted by the screw and the other side of the at least one heating resistor is electrically contacted by the contact plate. ### Claim 9 (depends on 8) The heating device according to claim 8, wherein a rear face of the contact plate which faces away from the at least one heating resistor is electrically insulated from the screw via an insulation layer. ### Claim 10 (depends on 1) The heating device according to claim 1, wherein the helical flow channel is delimited on a radially inner side by an inwardly rounded wall. ### Claim 11 (depends on 1) The heating device according to claim 1, wherein the tube housing is closed at each of its ends by a cover. ### Claim 12 (depends on 1) The heating device according to claim 1, wherein the screw has a roughened surface. ### Claim 13 (depends on 1) The heating device according to claim 1, wherein the screw carries heat output elements arranged in the flow channel. ### Claim 14 (depends on 1) The heating device according to claim 1, wherein the screw has a thread with flanks that have a thickness that decreases in a radially outward direction. ### Claim 15 (depends on 1) The electric heating device according to claim 1, wherein the frame holds the heating resistor in a clamped manner. ### Claim 16 (depends on 1) The electric heating device according to claim 1, wherein the helical flow channel is delimited on a radially inner side by an inwardly rounded wall. ### Claim 17 (depends on 16) The electric heating device according to claim 16, wherein the screw has flanks which have a thickness that decreases in a radially outward direction. ### Claim 18 (depends on 1) The electric heating device according to claim 1, further comprising a spring that presses the heating resistor or the contact plate against an interior wall of the core. ### Claim 19 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. ### Claim 20 (depends on 19) The electric heating device of claim 19, wherein a rear face of the contact plate faces away from the heating resistor and is electrically insulated with respect to the screw by an insulation layer. ### Claim 21 (depends on 19) The electric heating device of claim 19, wherein the frame holds the at least one heating resistor in a clamped manner. ### Claim 22 (depends on 19) The electric heating device according to claim 19, wherein the frame has a compartment to hold the at least one heating resistor. ### Claim 23 (depends on 19) The electric heating device according to claim 19, wherein the heating resistor comprises a PTC element.