Air cooled resistor

Patent metadata

Field	Value
Publication number	US-12334234-B2
Application number	US-202217969910-A
Country	US
Kind code	B2
Filing date	Oct 20, 2022
Priority date	Nov 17, 2021
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

An air cooled resistor arrangement comprising a first elongated tube member which is housed inside a second elongated tube member. The first and second elongated tube members are spaced apart from each other by an air gap for allowing a flow of air to flow through the first elongated tube member and the air gap.

First claim

The invention claimed is:

1. An air cooled resistor arrangement, comprising:
a first elongated tube member comprising a first open inlet portion and a first open outlet portion, the first elongated tube member extending from the first open inlet portion to the first open outlet portion,
a second elongated tube member comprising a second open inlet portion and a second open outlet portion, the second elongated tube member extending from the second open inlet portion to the second open outlet portion, and
an electrically conductive resistor element comprising an electric resistive material, the resistor element being connectable to a source of electric power, wherein the resistor element is arranged on a surface of the first elongated tube member,
wherein the first elongated tube member is housed inside the second elongated tube member, the first elongated tube member and the second elongated tube member being spaced apart from each other continuously along the extension of the first elongated tube member by an air gap perpendicular to the extension of the first elongated tube member such that a flow of air entering the air cooled resistor arrangement is directed through the first elongated tube member and through the air gap, and heated by the resistor element before being exhausted through the first and the second open outlet portions.

2. The air cooled resistor arrangement of claim 1 , wherein the second elongated tube member is closed in a direction perpendicular to the elongation of the second elongated tube member between the second inlet portion and the second outlet portion.

3. The air cooled resistor arrangement of claim 1 , wherein the first elongated tube member is closed in a direction perpendicular to the elongation of the first elongated tube member between the first inlet portion and the first outlet portion.

4. The air cooled resistor arrangement of claim 1 , wherein the resistor element extends between the first open inlet portion and the first open outlet portion.

5. The air cooled resistor arrangement of claim 1 , wherein the air cooled resistor arrangement further comprises at least one connecting element, the at least one connecting element connecting the first and the second elongated tube members to each other.

6. The air cooled resistor arrangement of claim 5 , wherein the at least one connecting element is formed by an electrically insulating material.

7. The air cooled resistor arrangement of claim 1 , wherein the first elongated tube member comprises a heat conductive structure, the heat conductive structure arranged on an inner wall portion of the first elongated tube member and extends in a direction perpendicular to the extension of the first elongated tube member and away from the second elongated tube member.

8. The air cooled resistor arrangement of claim 7 , wherein the heat conductive structure extends in a direction parallel with the extension of the first elongated tube member.

9. The air cooled resistor arrangement of claim 8 , wherein the heat conductive structure extends from the first open inlet portion to the first open outlet portion.

10. The air cooled resistor arrangement of claim 7 , wherein the heat conductive structure is arranged in a honeycomb pattern.

11. The air cooled resistor arrangement of claim 7 , wherein the heat conductive structure is formed by a plurality of taper shaped elements arranged on the inner wall portion of the first elongated tube member.

12. The air cooled resistor arrangement of claim 1 , wherein the second elongated tube member has a circular cross section.

13. The air cooled resistor arrangement of claim 1 , wherein the resistor element is formed by at least one resistor winding arranged around the surface of the first elongated tube member.

14. A braking system for a vehicle, comprising:
an electric traction motor configured to propel the vehicle and to controllably regenerate electric power during regenerative braking of the vehicle,
an electric machine comprising an output shaft,
an air blower connected to the output shaft of the electric machine, the air blower being operable by the electric machine by rotation of the output shaft, wherein the air blower is arranged in an air conduit,
the air cooled resistor arrangement of claim 1 , and
a source of electric power electrically connected to the electric machine and to the electrically conductive resistor element of the air cooled resistor arrangement, the source of electric power comprising an electric storage system configured to receive and supply electric power, wherein the electric machine and the air cooled resistor arrangement are operated by electric power received from the electric storage system, the electric storage system being further electrically connected to the electric traction motor and configured to receive electric power during regenerative braking.

15. A vehicle, comprising:
an electric traction motor configured to propel the vehicle,
a source of electric power comprising an electric storage system, wherein the source of electric power is electrically connected to the electric traction motor, and
the air cooled resistor arrangement of claim 1 , wherein the electrically conductive resistor element is electrically connected to the source of electric power for dissipating electric power generated by the electric traction motor during braking.

Assignees

• Volvo Truck Corp

Inventors

• Audhav Tove
• Rahm Fredrik
• Ising Magnus
• Andersson Arne

Classifications

• H05B2203/022

  Heaters specially adapted for heating gaseous material · CPC title

• H05B2203/014

  Heaters using resistive wires or cables not provided for in H05B3/54 · CPC title

• H01C1/082 Primary

  using forced fluid flow · CPC title

• H05B3/42 Primary

  non-flexible · CPC title

• B60L7/02 Primary

  Dynamic electric resistor braking (B60L7/22 takes precedence) · CPC title