Electric heating device

Patent metadata

Field	Value
Publication number	US-11420499-B2
Application number	US-201916567583-A
Country	US
Kind code	B2
Filing date	Sep 11, 2019
Priority date	Sep 11, 2018
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

An electric heating device and a method for manufacturing an electric heating device with at least two plate pairs forming a fluid passage through which fluid can flow, which plate pairs are assembled from two plates and form a fluid passage between the two, wherein the plate pairs take on a predefined distance from one another and form a free space, wherein at least one heating unit is arranged in the free space between at least two of the plate pairs, which heating unit has at least one heating element and contact electrodes electrically connected thereto for making electrical contact with the at least one heating element. The invention also relates to such an electric heating device.

First claim

What is claimed is:

1. A method for manufacturing an electric heating device comprising at least two plate pairs with each of the at least two plate pairs forming a fluid passage through which fluid is adapted to flow, the at least two plate pairs each being assembled from two plates that form the fluid passage therebetween, wherein the at least two plate pairs take on a predefined distance from one another and form a free space, wherein at least one heating unit is arranged in the free space between the at least two plate pairs, the at least one heating unit having at least one heating element and contact electrodes electrically connected thereto for making electrical contact with the at least one heating element, the method comprising:
providing and stacking plates into a stack of plates having the at least two plate pairs;
soldering the stack of plates; and
inserting and attaching the at least one heating unit in the free space between the at least two plate pairs,
wherein the at least one heating unit is attached to the at least two plate pairs in the free space via at least one adhesive that is fed into the free space and that subsequently cures, the at least one adhesive simultaneously forming an electrical insulation of the contact electrodes with respect to a relevant adjacent plate.

2. The method according to claim 1 , wherein the at least one adhesive is fed into the free space before insertion of the at least one heating unit into the free space or wherein the at least one adhesive is fed into the space after insertion of the at least one heating unit into the free space.

3. The method according to claim 1 , wherein a partial sealing of one side at a time of the free space is accomplished via sealing elements before the at least one adhesive is fed into the free space.

4. The method according to claim 3 , wherein after the partial sealing of the free space, the free space is filled with the at least one adhesive.

5. The method according to claim 4 , wherein after the partial sealing of the free space, the free space is filled with the at least one adhesive and an insertion of the at least one heating unit into the free space already filled with the at least one adhesive takes place, or wherein the at least one heating unit is inserted into the free space before the feeding of the at least one adhesive and subsequently the at least one adhesive is fed into the free space that has been partially sealed beforehand.

6. The method according to claim 1 , wherein the at least one adhesive is an adhesive substance, a silicone compound, a potting compound, a cross-linkable plastic molding compound, and/or a flowable substance.

7. The method according to claim 1 , wherein the at least one adhesive includes a plurality of different adhesives.

8. The method according to claim 3 , wherein the sealing elements are removed after the at least one adhesive has cured.

9. The method according to claim 1 , wherein the at least one adhesive is electrically insulating and thermally conductive.

10. The method according to claim 9 , wherein the at least one adhesive contains agents and/or particles for improving the thermal conductivity of the at least one adhesive.

11. The method according to claim 1 , wherein the free space is at least partially evacuated prior to the filling with the adhesive.

12. The method according to claim 1 , wherein the at least one adhesive is fed into the free space before insertion of the at least one heating unit, and wherein excess adhesive is expelled from the free space during the insertion of the at least one heating unit into the free space.

13. The method according to claim 1 , wherein the at least one heating unit has a frame for arrangement of the at least one heating element and/or for defined positioning of the at least one heating element in the free space.

14. The method according to claim 1 , wherein the stack of plates is provided with an inlet connection and an outlet connection prior to soldering, and/or wherein the fluid passages of the at least two plate pairs are in fluid connection with one another.

15. The method according to claim 14 , wherein the inlet connection and the outlet connection are arranged on a same plate pair of the stack of plates or on an end plate pair of the stack of plates or wherein the inlet connection and the outlet connection are arranged on different plate pairs of the stack of plates or on opposing end plate pairs of the stack of plates.

16. An electric heating device comprising:
at least two plate pairs with each of the at least two plate pairs forming a fluid passage through which fluid is adapted to flow, the at least two plate pairs each being assembled from two plates that form a fluid passage therebetween;
a free space formed between the at least two plate pairs that are spaced a predefined distance from one another; and
at least one heating unit arranged in the free space between the at least two of plate pairs, the at least one heating unit having at least one heating element and contact electrodes electrically connected thereto for making electrical contact with the at least one heating element,
wherein the at least one heating unit is held in the free space via at least one adhesive that subsequently cures, and
wherein the at least one adhesive simultaneously forms an electrical insulation of the contact electrodes with respect to a relevant adjacent plate.

17. The electric heating device according to claim 16 , wherein the at least two plate pairs are stacked to form a stack of plates and wherein the stack of plates is soldered and the at least one heating unit is inserted into the free space after the soldering.

18. The electric heating device according to claim 16 , wherein the at least one adhesive is electrically insulating and thermally conductive.

19. The electric heating device according to claim 16 , wherein the at least one adhesive is an adhesive substance, a silicone compound, a potting compound, a cross-linkable plastic molding compound, and/or a flowable substance.

20. The electric heating device according to claim 18 , wherein the at least one adhesive contains agents and/or particles for improving the thermal conductivity of the at least one adhesive.

21. The electric heating device according to claim 16 , wherein the at least one heating unit has a frame for arrangement of the at least one heating element and/or for defined positioning of the at least one heating element in the free space and/or for distribution of the at least one adhesive.

22. The electric heating device according to claim 21 , wherein the frame surrounds or delimits the at least one heating unit on at least three sides or on four sides.

23. The electric heating device according to claim 21 , wherein the frame is a rigid frame or a collapsible frame.

24. The electric heating device according to claim 21 , wherein at least one projecting edge, a beveled edge, at least one ridge, or at least one nub is provided on the frame for distribution of the at least one adhesive.

25. The electric heating device according to claim 21 , wherein a central ridge projects from the frame.

26. The method according to claim 1 , wherein the inserting and the attaching of the at least one heating unit in the free space between the at least two plate pairs occurs after the soldering of the stack of plates.

27. The electric heating device accordin

Assignees

• Mahle Int Gmbh

Inventors

• Tschemeris Igor
• Daniel Alexander
• Bouchalat Karim-Mathieu
• Kohl Michael

Classifications

• H05B2203/017

  Manufacturing methods or apparatus for heaters · 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

• H05B2203/021

  Heaters specially adapted for heating liquids · CPC title

• H05B3/32 Primary

  heating conductor mounted on insulators on a metallic frame · CPC title

• H05B3/86

  the heating conductors being embedded in the transparent or reflecting material {(H05B3/845 takes precedence)} · CPC title