Method for producing a heating rod

Patent metadata

Field	Value
Publication number	US-9486871-B2
Application number	US-201314011090-A
Country	US
Kind code	B2
Filing date	Aug 27, 2013
Priority date	Aug 29, 2012
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

This disclosure relates to a method for producing a heating rod for a vehicle heating apparatus, said method comprising the following steps: arranging at least one PTC element and at least one contact element in a tube, which is formed from sheet metal and is open along a longitudinal side; welding portions of the sheet metal that bear against one another by means of a weld seam running in the longitudinal direction of the tube. This disclosure also relates to such a heating rod.

First claim

What is claimed is:

1. A method for producing a heating rod, said method comprising the following steps:
arranging at least one PTC element and at least one contact element in a housing tube, which is formed from sheet metal and is open along a longitudinal side;
forming inwardly curved narrow sides of the housing tube;
welding portions of the sheet metal that bear against one another by means of a weld seam running in the longitudinal direction of the housing tube; and
forming at least one cooling element starting at the weld seam.

2. The method according to claim 1 , wherein the weld seam runs continuously from one end of the housing tube to the other end of the tube.

3. The method according to claim 1 , wherein the contact element is a sheet metal strip, which, via a front face, bears against the PTC element and, on its rear face, bears against an insulation layer.

4. The method according to claim 1 , wherein the sheet metal is bent on two sides to form the housing tube and at least one longitudinal edge section of the sheet metal is bent away from an opposing edge section to from a cooling element protruding away from the housing tube.

5. The method according to claim 1 , wherein the housing tube is joined together from two half shells.

6. The method according to claim 1 , wherein the housing tube is formed from the sheet metal by bending an edge portion of the sheet metal towards an opposed edge portion.

7. The method according to claim 1 , wherein the housing tube is formed as a flat tube.

8. The method according to claim 1 , wherein the housing tube is formed to have an inwardly curved side wall, which bears against an insulation layer.

9. The method according claim 1 , wherein the housing tube is formed to have inwardly curved narrow sides.

10. The method according to claim 1 , further comprising closing the open longitudinal side of the housing tube before the step of welding.

11. A method for producing a heating rod, said method comprising the following steps:
arranging at least one ceramic PTC element and at least one contact element in a flat housing tube formed with an inwardly curved sidewall which bears against an insulation layer and inwardly curved narrow sides, wherein the housing tube is formed from sheet metal and is open along a longitudinal side, further wherein the contact element is a sheet metal strip, which, via a front face, bears against the ceramic PTC element and, on a rear face, bears against the insulation layer; and
welding portions of the sheet metal that bear against one another by means of a weld seam running in the longitudinal direction of the tube.

12. The method according to claim 11 , further comprising closing the open longitudinal side of the housing tube before the step of welding.

Assignees

• Borgwarner Beru Systems Gmbh
• Borgwarner Ludwigsburg Gmbh

Inventors

• Giffels Thomas
• Waechter Ralph
• Luppold Michael
• Dauth Alexander
• Lehmann Klaus

Classifications

• H05B2203/02

  Heaters using heating elements having a positive temperature coefficient · CPC title

• B23K9/0008 Primary

  Welding without shielding means against the influence of the surrounding atmosphere · CPC title

• H05B2203/023

  Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system · CPC title

• H05B2203/017

  Manufacturing methods or apparatus for heaters · CPC title

• H05B3/24 Primary

  heating conductor being self-supporting · CPC title