Heating Apparatus and Method for Producing the Heating Apparatus

• US 20110297666A1
• Filed: 07/03/2009
• Published: 12/08/2011
• Est. Priority Date: 07/10/2008
• Status: Abandoned Application

• Current Assignee: Epcos AG (TDK Corporation)
• Original Assignee: Epcos AG (TDK Corporation)
• Inventors: Ihle, Jan, Wischnat, Volker, Kahr, Wemer
• Application Number:
  US13/002,934
• Publication Number:
  US 20110297666A1
• Time in Patent Office: Days
• US Class Current: 219/538
• CPC Class Codes: C04B 2235/3262 Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
• CPC Class Codes: C04B 2235/6022 Injection moulding
• CPC Class Codes: C04B 2235/6028 Shaping around a core which is removed later
• CPC Class Codes: C04B 35/4682 based on BaTiO3 perovskite phase
• CPC Class Codes: H05B 2203/017 Manufacturing methods or apparatus for heaters
• CPC Class Codes: H05B 2203/02 Heaters using heating elements having a positive temperature coefficient
• CPC Class Codes: H05B 3/141 Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
• CPC Class Codes: Y10T 29/49083 Heater type

Abstract

A heating apparatus and a method for producing a heating apparatus are specified. The heating apparatus comprises a pipe (10), which is suitable for conducting a medium and has an outer surface, and at least one injection-molded shaped body on the outer surface of the pipe (10). The shaped body comprises a material with a positive temperature coefficient of electrical resistance and is adapted to the outer surface of the pipe (10).

Claims

1. A heating apparatus, comprising:

a pipe having an outer surface, said pipe being suitable for conducting a medium and at least one injection-molded shaped body on the outer surface of the pipe, wherein the shaped body comprises a material with a positive temperature coefficient of electrical resistance and is adapted to the outer surface of the pipe.

2. The heating apparatus as claimed in claim 1, wherein the outer surface of the pipe has a curvature at least in partial regions.

3. The heating apparatus as claimed in claim 1, wherein the pipe comprises a thermally highly conductive material.

4. The heating apparatus as claimed in claim 1, wherein the at least one shaped body and the pipe are in thermal contact with one another.

5. The heating apparatus as claimed in claim 1, wherein a thermally conductive paste is arranged between the pipe and the at least one shaped body.

6. The heating apparatus as claimed in claim 1, wherein the at least one shaped body has a longitudinal extension.

7. The heating apparatus as claimed in claim 1, wherein the shaped body is fixed to the pipe by means of a clamp or by means of an adhesive.

8. The heating apparatus as claimed in claim 1, wherein the pipe has a cylindrical outer surface, and the at least one shaped body is adapted to the outer surface in a positively locking manner.

9. The heating apparatus as claimed in claim 1, wherein along the circumferential direction of the pipe, a plurality of shaped bodies are arranged on the outer surface of said pipe.

10. The heating apparatus as claimed in claim 1, wherein the pipe are suitable for conducting fluids.

11. The heating apparatus as claimed in claim 1, wherein the shaped body has electrical contact-connections for generating a current flow.

12. The heating apparatus as claimed in claim 1, wherein the at least one shaped body contains a ceramic material having the structure Ba_l-x-yM_xD_yTi_l-a-bN_aMn_bO₃, where x=0 to 0.5, y=0 to 0.01, a=0 to 0.01, b=0 to 0.01, M comprises a divalent cation, D comprises a trivalent or tetravalent donor, and N comprises a pentavalent or hexavalent cation.

13. The heating apparatus as claimed in claim 1, wherein the at least one shaped body has a Curie temperature which comprises a range of −

30°

C. to 340°

C.

14. The heating apparatus as claimed in claim 1, wherein the at least one shaped body has a resistance at 25°

C. which lies in a range of 3 Ω

cm to 30 000 Ω

cm.

15. A method for producing a heating apparatus as claimed in claim 1, comprising the following method steps:

A) providing a pipe having an outer surface;

B) injection-molding an at least one shaped body having a form adapted to the outer surface of the pipe;

C) sintering the shaped body;

D) arranging electrodes on the shaped body; and

E) assembling and fixing the at least one shaped body and the pipe.