Exhaust gas heater

Patent metadata

Field	Value
Publication number	US-11486285-B2
Application number	US-202016951816-A
Country	US
Kind code	B2
Filing date	Nov 18, 2020
Priority date	Nov 22, 2019
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

An exhaust gas heater, for an internal combustion engine exhaust system, includes a support (22) with an outer circumferential area (24), arranged radially outside in relation to a heater longitudinal axis (A), and a central area (26). A heating conductor (42) is carried at the support and includes a helically wound heating section (44) on a first axial side (34) of the support. The central area is axially offset in a direction of the first axial side of the support in relation to the outer circumferential area such that a radially outer end section of the heating section, which outer end section is located in the area of the outer circumferential area of the support, and a radially inner end section (48) of the heating section, which inner end section is located in the area of the central area of the support, are axially offset in relation to one another.

First claim

What is claimed is:

1. An exhaust gas heater for an exhaust system of an internal combustion engine, the exhaust gas heater comprising:
a support with an outer circumferential area arranged radially on an outside in relation to a heater longitudinal axis and with a central area; and
a heating conductor carried at the support, wherein the heating conductor comprises a helically wound heating section arranged on a first axial side of the support, wherein the central area is arranged axially offset in relation to the outer circumferential area in a direction of the first axial side of the support such that a radially outer end section of the heating section, which radially outer end section is located in an area of the outer circumferential area of the support, and a radially inner end section of the heating section, which radially inner end section is located in the area of the central area of the support, are arranged axially offset in relation to one another, wherein:
the support comprises a plurality of connection webs, which are arranged at circumferentially spaced locations from one another and connect the central area to the outer circumferential area; and
flow openings are formed between connection webs located directly adjacent to one another in the circumferential direction.

2. The exhaust gas heater in accordance with claim 1 , wherein:
the support has a carrying area, which extends between the outer circumferential area and the central area and carries essentially the heating section; and
the carrying area has a conical shape.

3. The exhaust gas heater in accordance with claim 1 , wherein the central area is arched convexly out in the direction of the first axial side.

4. The exhaust gas heater in accordance with claim 1 , wherein the support is configured as a shaped sheet metal part.

5. The exhaust gas heater in accordance with claim 1 , wherein the heating conductor is electrically insulated in a length area covering the support.

6. The exhaust gas heater in accordance with claim 1 , wherein:
the heating conductor is not essentially insulated electrically in a length area covering the support; and
a plurality of insulating elements, which enclose the heating conductor and are fixed or/and supported on the heating conductor, are provided at the heating conductor.

7. The exhaust gas heater in accordance with claim 1 , wherein flow openings following one another in the circumferential direction provide a plurality of opening ring structures arranged radially staggered.

8. The exhaust gas heater in accordance with claim 1 , wherein flow openings following one another in the circumferential direction provide a helical opening structure.

9. The exhaust gas heater in accordance with claim 8 , wherein:
a helical course of the helical opening structure corresponds essentially to a helical course of the heating section; and
the heating section is arranged in relation to the helical opening structure such that the heating section is arranged essentially covering the flow openings of the helical opening structure.

10. The exhaust gas heater in accordance with claim 8 , wherein:
a helical course of the helical opening structure corresponds essentially to a helical course of the heating sections; and
the heating section is arranged in relation to the helical opening structure such that the heating section is arranged not essentially covering the helical opening structure.

11. The exhaust gas heater in accordance with claim 1 , wherein:
the heating conductor comprises a connection section adjoining the radially inner end section of the heating section; and
the connection section is led at a second axial side of the support along a connection web from the radially inward direction to the radially outward direction.

12. The exhaust gas heater in accordance with claim 6 , further comprising groups of insulating elements, wherein:
the support comprises a plurality of connection webs, which are arranged at circumferentially spaced locations from one another and connect the central area to the outer circumferential area; and
flow openings are formed between connection webs located directly adjacent to one another in the circumferential direction;
the groups of insulating elements are arranged extending from the radially outward direction to the radially inward direction at the heating conductor in an area of the connection webs; and
the insulating elements of the first groups of insulating elements enclose sections of the heating section, which extend in the area of the connection webs.

13. The exhaust gas heater in accordance with claim 12 , wherein the groups of insulating elements comprise first groups of insulating elements and further comprising a second group of insulating elements arranged extending from the radially outward direction to the radially inward direction between at least two of the first groups of insulating elements following one another directly in the circumferential direction, wherein the insulating elements of the second group of insulating elements enclose sections of the heating section, which extend in an area between two connection webs.

14. The exhaust gas heater in accordance with claim 1 , wherein the heating section is held at the support by a plurality of comb-shape holding elements, which extend over the heating section and are fixed to the support.

15. The exhaust gas heater in accordance with claim 12 , wherein the heating section is held by a holding element at the support in an area of at least one and preferably each first group of insulating elements.

16. The exhaust gas heater in accordance with claim 1 , wherein a plurality of fastening sections bent off in the axial direction are provided at the outer circumferential area of the support for fixing the support to an exhaust gas-carrying component.

17. The exhaust gas heater in accordance with claim 16 , wherein at least some of the fastening sections are bent off in the direction of the first axial side.

18. An exhaust system comprising:
an exhaust gas-carrying component; and
an exhaust gas heater arranged in the exhaust gas-carrying component, the exhaust gas heater comprising:
a support with an outer circumferential area arranged radially on an outside in relation to a heater longitudinal axis and with a central area; and
a heating conductor carried at the support, wherein the heating conductor comprises a helically wound heating section arranged on a first axial side of the support, wherein the central area is arranged axially offset in relation to the outer circumferential area in a direction of the first axial side of the support such that a radially outer end section of the heating section, which radially outer end section is located in an area of the outer circumferential area of the support, and a radially inner end section of the heating section, which radially inner end section is located in the area of the central area of the support, are arranged axially offset in relation to one another, wherein:
the support comprises a plurality of connection webs, which are arranged at circumferentially spaced locations from one another and connect the central area to the outer circumferential area; and
flow openings are formed between connection webs located directly adjacent to one another in the circumferential direction.

19. The exhaust system in accordance with claim 18 , wherein the exhaust gas heater is arranged in the exhaust gas-carrying component with the heater longitudinal axis extending essentially in a direction

Assignees

• Purem GmbH

Inventors

• Kurpejovic Enver
• Solipuram Vijaya Bhaskar
• Uysal Fatih

Classifications

• F01N2240/16

  an electric heater, i.e. a resistance heater · CPC title

• F01N3/2013 Primary

  using electric or magnetic heating means · CPC title

• F01N3/2882

  Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices (combined with absorbents or adsorbents only F01N3/0814; combined with particulate filters F01N3/035) · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F01N2240/20

  a flow director or deflector · CPC title