Electrical heating device

• US 9,693,394 B2
• Filed: 05/09/2016
• Issued: 06/27/2017
• Est. Priority Date: 05/11/2015
• Status: Active Grant

• Current Assignee: BorgWarner Ludwigsburg GmbH (BorgWarner Incorporated)
• Original Assignee: BorgWarner Ludwigsburg GmbH (BorgWarner Incorporated)
• Inventors: Sweeney, Stephen, Maher, Anthony, O'Sullivan, Katherine
• Primary Examiner(s): PASCHALL, MARK H
• Application Number:
  US15/149,584
• Publication Number:
  US 20160332507A1
• Time in Patent Office: 414 Days
• Field of Search: 219202, 219497, 219504, 219505
• CPC Class Codes: F24H 3/0405 using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between F24H3/06, F24H3/08, F24H3/10 take precedence
• CPC Class Codes: F24H 3/0435 Structures comprising heat spreading elements in the form of fins
• CPC Class Codes: F24H 9/1872 PTC
• CPC Class Codes: H05B 2203/019 Heaters using heating elements having a negative temperature coefficient
• CPC Class Codes: H05B 2203/02 Heaters using heating elements having a positive temperature coefficient
• CPC Class Codes: H05B 2203/023 Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system
• CPC Class Codes: H05B 3/141 Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
• CPC Class Codes: H05B 3/50 heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins

Abstract

Disclosed is an electrical heating device for heating the interior of a vehicle, comprising a plurality of PTC heating rods each comprising ceramic PTC heating resistors, heat sinks for transferring heat from the PTC heating rods to an air flow, and a holder holding the PTC heating rods. The PTC heating rods are connected in series to an NTC heating rod comprising at least one NTC resistor, wherein the NTC heating rod is held by the holder.

Claims

1. An electrical heating device for heating the interior of a vehicle, comprising:

a plurality of PTC heating rods each comprising ceramic PTC heating resistors;

an NTC heating rod comprising at least one NTC resistor;

a holder that holds the PTC heating rods and the NTC heating rod; and

heat sinks for transferring heat from the PTC heating rods to an air flow;

wherein the PTC heating rods are connected in series to the NTC heating rod; and

wherein the PTC heating rods are connected in parallel to each other.

2. The electrical heating device according to claim 1, wherein the PTC heating rods comprise tubes in which the PTC resistors are arranged and the NTC heating rod comprises a tube in which the at least one NTC resistor is arranged.

3. The electrical heating device according to claim 1, wherein the at least one NTC heating resistor is a ceramic NTC resistor.

4. The electrical heating device according to claim 1, wherein the NTC heating rod is arranged between PTC heating rods.

5. The electrical heating device according to claim 1, wherein the holder comprises a plug in connector for connecting the electrical heating device to a power source.

6. The electrical heating device according to claim 1, wherein each PTC heating rod and each NTC heating rod comprises a frame for positioning the resistors.

7. The electrical heating device according to claim 1, wherein each PTC heating rod and each NTC heating rod comprises two contact plates between which the respective PTC and NTC resistors are arranged, wherein the two contact plates are electrically insulated from a housing of the respective heating rod.

8. The electrical heating device according to claim 1, wherein the heat sinks adjacent to the NTC heating rod have a different heat transfer characteristic than the heat sinks that are adjacent only to one or two PTC heating rods.

9. An electrical heating device for heating the interior of a vehicle, comprising:

a plurality of PTC heating rods each comprising ceramic PTC heating resistors;

an NTC heating rod comprising at least one NTC resistor;

a holder that holds the PTC heating rods and the NTC heating rod; and

heat sinks for transferring heat from the PTC heating rods to an air flow;

wherein the PTC heating rods are connected in series to the NTC heating rod;

wherein the PTC heating rods comprise tubes in which the PTC resistors are arranged and the NTC heating rod comprises a tube in which the at least one NTC resistor is arranged; and

wherein each PTC heating rod and each NTC heating rod comprises a frame for positioning the resistors.

10. The electrical heating device according to claim 9, wherein the PTC heating rods are connected in parallel to each other.