High-temperature exhaust sensor

Patent metadata

Field	Value
Publication number	US-10428716-B2
Application number	US-201615385376-A
Country	US
Kind code	B2
Filing date	Dec 20, 2016
Priority date	Dec 20, 2016
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A sensing device ( 100 ) senses a physical quantity of a fluid having a high temperature. A tube-like element ( 110 ) surrounds at least a part of a MI-cable ( 102 ) between a sensing end of the MI-cable and a sealing flange element ( 106 ) attached to the MI-cable. A major part of the inner surface of the tube-like element is at a predefined distance from the outer surface of the Mineral Insulated cable forming a gap ( 112 ) between the mineral insulated cable and the tube-like element. The tube-like element and gap increases robustness against thermal expansions and thermal shock due to rapid temperature change of the fluid.

First claim

The invention claimed is:

1. A sensing device for sensing a physical quantity of a fluid having a high temperature, comprising:
a cable having an outer metallic jacket, conductors surrounded by the outer metallic jacket, and Magnesium Oxide insulation in contact with the conductors;
a sensing element configured for sensing the physical quantity and coupled to a sensing end of the cable;
a sealing flange element coupled to the outer metallic jacket of the cable; and
a tube-like element, having a proximal end attached to the sealing flange element, surrounding at least a part of the cable between the sealing flange element and the sensing end of the cable, wherein the sensing element is located exterior to the tube-like element and a major part of the inner surface of the tube-like element is at a predefined distance from the outer surface of the cable forming a gap between the cable and the tube-like element.

2. The sensing device according to claim 1 , wherein the gap is an air gap.

3. The sensing device according to claim 1 , wherein the tube-like element is welded to the sealing flange element.

4. The sensing device according to claim 1 , wherein the sensing element is configured to sense temperature.

5. The sensing device according to claim 1 , wherein the tube-like element comprises at least one radially crimped region to align the cable in the tube-like element.

6. The sensing device according to claim 5 , wherein the radially crimped region of the tube-like element is located at a distal end section of the tube-like element.

7. The sensing device according to claim 5 , wherein the radially crimped region comprises three or more dimples located at equal distances from each other.

8. The sensing device according to claim 1 , wherein the sealing flange element comprises a ring section and a tube section, wherein the tube-like element is attached to a distal end of the tube section.

9. The sensing device according to claim 8 , wherein the distal end of the tube section of the sealing flange element comprises an alignment feature configured to align a body axis of the sealing flange element and a body axis of the tube-like element.

10. The sensing device according to claim 8 , wherein the tube section of the sealing flange element comprises at least one radially crimped region.

11. The sensing device according to claim 10 , wherein the radially crimped region of the tube section is located at a distal end section of the tube section.

12. A device for sensing a physical quantity of a fluid having a high temperature, the device comprising:
a cable including: an outer metallic jacket; conductors surrounded by the outer metallic jacket; and insulation in contact with the conductors, wherein the cable has a sensing end;
a sensing element configured for sensing the physical quantity and coupled to the sensing end;
a sealing flange coupled to the outer metallic jacket of the cable; and
a tube-like element, having a proximal end attached to the sealing flange, surrounding at least a part of the cable between the sealing flange and the sensing end for forming a gap between the cable and the tube-like element, wherein the gap is filled with the fluid for measurement and the sensing end is located exterior to the tube-like element.

13. A sensing device for sensing a physical quantity of a fluid having a high temperature, comprising:
a cable having an outer metallic jacket, conductors surrounded by the outer metallic jacket, and Magnesium Oxide insulation in contact with the conductors;
a sensing element configured for sensing the physical quantity and coupled to a sensing end of the cable;
a sealing flange element coupled to the outer metallic jacket of the cable; and
a tube-like element surrounding at least a part of the cable between the sealing flange element and the sensing end of the cable, wherein the tube-like element comprises at least one radially crimped region to align the cable in the tube-like element, and wherein the sensing element is located exterior to the tube-like element and a major part of the inner surface of the tube-like element is at a predefined distance from the outer surface of the cable forming a gap between the cable and the tube-like element.

14. The sensing device according to claim 13 , wherein the gap is an air gap.

15. The sensing device according to claim 13 , wherein a proximal end of the tube-like element is attached to the sealing flange element.

16. The sensing device according to claim 13 , wherein the radially crimped region of the tube-like element is located at a distal end section of the tube-like element.

17. The sensing device according to claim 13 , wherein the radially crimped region comprises three or more dimples located at equal distances from each other.

Assignees

• Sensata Technologies Inc

Inventors

• Chenelle Brendan F
• Terryn Dirk J
• Griffin Joseph R

Classifications

• G01K2205/04

  for measuring exhaust gas temperature · CPC title

• G01K1/12 Primary

  for preventing damage due to heat overloading · CPC title

• G01K7/02

  using thermoelectric elements, e.g. thermocouples · CPC title

• G01K13/02

  for measuring temperature of moving fluids or granular materials capable of flow · CPC title

• F01N11/002 Primary

  the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus · CPC title