System for utilizing waste heat from an exhaust gas system

Patent metadata

Field	Value
Publication number	US-2016160750-A1
Application number	US-201414904081-A
Country	US
Kind code	A1
Filing date	Jun 27, 2014
Priority date	Jul 11, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

A waste heat device for an exhaust gas system may include a hermetically sealed separation sealing off an area against fluid loss. A drive coupling may drivingly connect in a contactless manner a drive to a device configured to receive the drive work. The drive coupling may include a magnetic clutch arrangement having an inlet side arranged within the separation and an outlet side arranged outside the separation. The outlet side may include an outer rotor and the inlet side may include an inner rotor. The outer rotor and the inner rotor may be separated from one another via a sealing cap having an intermediate wall disposed concentric to the rotors. The intermediate wall may form part of the hermetic separation. A plurality of pole bars of a magnetisable material may be arranged on the intermediate wall and be spaced apart in a circumferential direction.

First claim

1 . A waste heat device for an exhaust gas system, comprising: a high-speed turbine driven by a fluid that is heatable via a waste heat flow, the turbine arranged in an area sealed off against fluid loss via a hermetically sealed separation and drivingly connected via a drive coupling on an output side in a contactless manner to a device provided for receiving the turbine work arranged outside of the hermetic separation, wherein the drive coupling includes a magnetic clutch arrangement having an inlet side arranged within the hermetic separation and an outlet side arranged outside the hermetic separation, wherein the outlet side includes an annular outer rotor and the inlet side includes an inner rotor arranged concentric thereto about a rotor axis, the outer rotor and the inner rotor separated from one another by a sealing cap having an intermediate wall disposed concentric to the outer rotors and the inner rotor, the intermediate wall configured to form a part of the hermetic separation,
wherein the magnetic clutch arrangement is configured as a magnetic transmission, and wherein a plurality of pole bars of magnetisable material with a longitudinal axis parallel to the rotor axis are arranged on the intermediate wall and spaced apart from one another in a circumferential direction of the rotor axis.

2 . The device according to claim 1 , wherein the magnetic transmission is configured to step down a rotation speed of the turbine.

3 . The device according to claim 1 , further comprising a plurality of radially polarised permanent magnets having a magnetic polarisation alternating in the circumferential direction arranged in pairs on at least one of the inner rotor and the outer rotor, such that in the circumferential direction respectively a magnetic north pole follows a magnetic south pole.

4 . The device according to claim 3 , wherein a number of the pole bars corresponds to the sum of a number of the magnetic pole pairs of the outer rotor and a number of the magnetic pole pairs of the inner rotor.

5 . The device according to claim 1 , further comprising a plurality of radially polarised permanent magnets having a magnetic polarisation alternating in the circumferential direction arranged on the intermediate wall, such that in the circumferential direction a magnetic north pole follows a magnetic south pole, wherein the inner rotor has a body of magnetisable material and teeth disposed on an outer circumference side and tooth gaps extended therebetween in the circumferential direction, and wherein the outer rotor has a casing of magnetisable material and radially inwardly directed teeth of magnetisable material arranged thereon.

6 . The device according to claim 5 , wherein a number of the magnetic pole pairs on the intermediate wall corresponds to the sum of a number of tooth pairs on the outer rotor and a number of tooth pairs on the inner rotor.

7 . The device according to claim 1 , wherein the inner rotor has a body of magnetisable material.

8 . The device according to claim 7 , wherein the body of magnetisable material of the inner rotor further includes teeth disposed on an outer circumferential side and at least one tooth gap extended therebetween in the circumferential direction.

9 . The device according to claim 8 , wherein a number of the pole bars on the intermediate wall corresponds to the sum of a number of tooth pairs of the inner rotor and a number of pole pairs on a casing of the outer rotor.

10 . The device according to claim 7 , further comprising at least one permanent magnet disposed about an outer circumference side of the body of the inner rotor.

11 . The device according to claim 1 , wherein the magnetic transmission is configured as a reluctance transmission.

12 . The device according to claim 1 , further comprising a plurality of permanent magnets polarized in a radial direction disposed between the outer rotor and the intermediate wall, wherein the plurality of permanent magnets have a magnetic polarisation alternating in the circumferential direction.

13 . The device according to claim 12 , further comprising another plurality of permanent magnets polarised in the radial direction arranged on the intermediate wall and having a magnetic polarisation alternating in the circumferential direction.

14 . The device according to claim 13 , wherein the inner rotor has a body composed of a magnetisable material and a plurality of teeth disposed on an outer circumference side and at least one tooth gap extending between the plurality to teeth in the circumferential direction.

15 . The device according to claim 12 , further comprising another plurality of permanent magnets polarized in the radial direction disposed between the inner rotor and the intermediate wall and having a magnetic polarisation alternating in the circumferential direction.

16 . The device according to claim 15 , wherein a number of pole bars of the intermediate wall correspond to the sum of a number of magnetic pole pairs of the outer rotor and a number of magnetic pole pairs of the inner rotor.

17 . The device according to claim 2 , wherein the inner rotor has a body of a magnetisable material and a plurality of radially polarised permanent magnets disposed on an outer circumferential side having a magnetic polarisation alternating in the circumferential direction.

18 . The device according to claim 2 , wherein the inner rotor has a body of a magnetisable material and a plurality of teeth disposed on an outer circumferential side, wherein at least one tooth gap is defined between the plurality to teeth extending in the circumferential direction

19 . A waste heat device for an exhaust gas system, comprising:
a hermetically sealed separation sealing off an area against fluid loss, the area configured to receive a high-speed turbine driven by a fluid that is heatable via a waste heat flow; a drive coupling via which the turbine is drivingly connected on an output side in a contactless manner to a device arranged outside of the separation configured for receiving the turbine work, wherein the drive coupling includes a magnetic clutch arrangement having an inlet side arranged within the separation and an outlet side arranged outside the separation, wherein the outlet side includes an annular outer rotor and the inlet side includes an inner rotor arranged concentric thereto about a rotor axis; a sealing cap separating the outer rotor from the inner rotor and having an intermediate wall disposed concentric to the outer rotor and the inner rotor, wherein the intermediate wall forms at least part of the separation, and wherein the magnetic clutch arrangement is configured as a magnetic transmission; a plurality of pole bars of a magnetisable material having a longitudinal axis parallel to the rotor axis arranged on the intermediate wall and spaced apart from one another in a circumferential direction of the rotor axis; and a plurality of permanent magnets polarised in a radial direction of the rotor axis arranged on at least one of the inner rotor and the outer rotor, wherein the plurality of permanent magnets have a magnetic polarisation alternating along the circumferential direction.

20 . The device according to claim 19 , wherein a number of the plurality of pole bars corresponds to the sum of a number of magnetic pole pairs of the plurality of permanent magnets arranged on at least one of the inner rotor and the outer rotor.

Assignees

• Mahle Int Gmbh

Inventors

• Mueller Rolf
• Neubauer Andreas
• Riemay Thomas
• Wieske Peter

Classifications

• H02K49/102 Primary

  Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact (magnetized gearings with physical contact F16H13/12, F16H49/005) · CPC title

• H02K49/106

  with a radial air gap · CPC title

• F02B39/12 Primary

  Drives characterised by use of couplings or clutches therein (using fluid slip couplings for varying gear ratio F02B39/08) · CPC title

• F02B33/40

  of non-positive-displacement type · CPC title

• F02B37/00

  Engines characterised by provision of pumps driven at least for part of the time by exhaust · CPC title