Turbine with pressure distributer

Patent metadata

Field	Value
Publication number	US-10634052-B2
Application number	US-201716310612-A
Country	US
Kind code	B2
Filing date	May 18, 2017
Priority date	Jun 16, 2016
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

The invention relates to a turbine (20) having an impeller (23) arranged in a housing (26). The turbine (20) has an inflow region (21) and an outflow region (22) and a working medium flows through said turbine during operation. The working medium flows into the inflow region (21), along a front side (23a) formed on the impeller (23) and subsequently out of the outflow region (22). There is a pressure drop at the front side (23a) between the inflow region (21) and the outflow region (22). A pressure distributer (9) is arranged on the rear side (23b) of the impeller (23), opposite the front side (23a). The pressure distributer (9) comprises a slide ring (31), which cooperates with the rear side (23b) of the impeller (23) and thereby forms a vapour-lubricated throttle. A first flow path (51) runs through the throttle, wherein the throttle hydraulically divides the rear side (23b) into a first region (231) and a second region (232). The first region (231) borders the inflow region (21), and the second region borders a pressure chamber (11). During operation, the inflow region (21) is applied with a higher pressure than the pressure chamber (11). The slide ring (31) is axially moveable. A sealing ring (33) arranged in a groove (41) cooperates with the slide ring (31). A second flow path (52) runs from the inflow region (21) to the pressure chamber (11) between the groove (41) and the slide ring (31). The second flow path (52) can be closed by the sealing ring (33). The sealing ring (33) can be moved in the groove (41) in a defined manner.

First claim

The invention claimed is:

1. A turbine ( 20 ) having an impeller ( 23 ) arranged in a housing ( 26 ), wherein the turbine ( 20 ) has an inflow region ( 21 ) and an outflow region ( 22 ) and a working medium flows through said turbine during operation, wherein the working medium flows into the inflow region ( 21 ), along a front side ( 23 a ) formed on the impeller ( 23 ) and subsequently out of the outflow region ( 22 ), wherein there is a pressure drop on the front side ( 23 a ) between the inflow region ( 21 ) and the outflow region ( 22 ), wherein a pressure distributer ( 9 ) is arranged on the rear side ( 23 b ) of the impeller ( 23 ) opposite the front side ( 23 a ), wherein the pressure distributer ( 9 ) comprises a sliding ring ( 31 ) which interacts with the rear side ( 23 b ) of the impeller ( 23 ) and thus forms a vapor-lubricated throttle, wherein a first flow path ( 51 ) runs through the throttle, wherein the throttle divides the rear side ( 23 b ) into a first region ( 231 ) and a second region ( 232 ), wherein the first region ( 231 ) delimits the inflow region ( 21 ) and wherein the second region delimits a pressure chamber ( 11 ), wherein the inflow region ( 21 ) is loaded with a higher pressure than the pressure chamber ( 11 ) during operation, wherein the sliding ring ( 31 ) is axially movable, wherein a sealing ring ( 33 ) arranged in a groove ( 41 ) interacts with the sliding ring ( 31 ), wherein a second flow path ( 52 ) runs from the inflow region ( 21 ) to the pressure chamber ( 11 ) between the groove ( 41 ) and the sliding ring ( 31 ), wherein the second flow path ( 52 ) can be closed by the sealing ring ( 33 ), characterized in that the sealing ring ( 33 ) is movable in the groove ( 41 ) to a defined degree.

2. The turbine ( 20 ) as claimed in claim 1 , characterized in that the pressure chamber ( 11 ) is hydraulically connected to the outflow region ( 22 ).

3. The turbine ( 20 ) as claimed in claim 1 , characterized in that the groove ( 41 ) is of J-shaped design, wherein the groove ( 41 ) has a tapering region ( 42 ).

4. The turbine ( 20 ) as claimed in claim 3 , characterized in that an inner sealing force F i ( 81 ) between the sealing ring ( 33 ) and the sliding ring ( 31 ) is reduced upon insertion of the sealing ring ( 33 ) into the tapering region ( 42 ).

5. The turbine ( 20 ) as claimed in claim 3 , characterized in that the tapering region ( 42 ) has a ramp region ( 43 ) for inserting the sealing ring ( 33 ) into the tapering region ( 42 ).

6. The turbine ( 20 ) as claimed in claim 5 , characterized in that a linear ramp ( 44 ) for guiding the sealing ring ( 33 ) is formed on the ramp region ( 43 ).

7. The turbine ( 20 ) as claimed in claim 1 , characterized in that the groove ( 41 ) is formed in the housing ( 26 ).

8. The turbine ( 20 ) as claimed in claim 1 , characterized in that the groove ( 41 ) is formed in a clamping ring ( 40 ), wherein the clamping ring ( 40 ) is fixedly connected to the housing ( 26 ).

9. The turbine ( 20 ) as claimed in claim 1 , characterized in that the sliding ring ( 31 ) is clamped against the rear side ( 23 b ) by a sliding ring spring ( 32 ).

10. The turbine ( 20 ) as claimed in claim 1 , characterized in that the turbine ( 20 ) takes the form of a radial turbine.

11. A waste-heat recovery system for an internal combustion engine, wherein the waste-heat recovery system comprises a turbine ( 20 ) as claimed in claim 1 , a condenser, a feed fluid pump and an evaporator.

12. The turbine ( 20 ) as claimed in claim 5 , characterized in that a linear ramp ( 44 ) for guiding the sealing ring ( 33 ) is formed on the ramp region ( 43 ), wherein the linear ramp ( 44 ) is inclined by 30° to 40° with respect to the sliding ring ( 31 ).

13. The turbine ( 20 ) as claimed in claim 2 , characterized in that the groove ( 41 ) is of J-shaped design, wherein the groove ( 41 ) has a tapering region ( 42 ).

14. The turbine ( 20 ) as claimed in claim 13 , characterized in that an inner sealing force F i ( 81 ) between the sealing ring ( 33 ) and the sliding ring ( 31 ) is reduced upon insertion of the sealing ring ( 33 ) into the tapering region ( 42 ).

15. The turbine ( 20 ) as claimed in claim 14 , characterized in that the tapering region ( 42 ) has a ramp region ( 43 ) for inserting the sealing ring ( 33 ) into the tapering region ( 42 ).

16. The turbine ( 20 ) as claimed in claim 15 , characterized in that a linear ramp ( 44 ) for guiding the sealing ring ( 33 ) is formed on the ramp region ( 43 ).

17. The turbine ( 20 ) as claimed in claim 16 , characterized in that the groove ( 41 ) is formed in the housing ( 26 ).

18. The turbine ( 20 ) as claimed in claim 16 , characterized in that the groove ( 41 ) is formed in a clamping ring ( 40 ), wherein the clamping ring ( 40 ) is fixedly connected to the housing ( 26 ).

19. The turbine ( 20 ) as claimed in claim 16 , characterized in that the sliding ring ( 31 ) is clamped against the rear side ( 23 b ) by a sliding ring spring ( 32 ).

20. The turbine ( 20 ) as claimed in claim 19 , characterized in that the turbine ( 20 ) takes the form of a radial turbine.

Assignees

• Bosch Gmbh Robert

Inventors

• Uhlmann Dietmar
• Di Giandomenico Giuseppe
• Colodel Luiz-Alexandre

Classifications

• F02C6/12 Primary

  Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure · CPC title

• F01D3/04

  axial thrust being compensated by thrust-balancing dummy piston or the like · CPC title

• F05D2220/40

  in turbochargers · CPC title