Turbomachine

Patent metadata

Field	Value
Publication number	US-10598014-B2
Application number	US-201515539048-A
Country	US
Kind code	B2
Filing date	Nov 25, 2015
Priority date	Dec 23, 2014
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

The turbomachine comprises a casing ( 26 ), there being arranged in the casing an impeller ( 23 ) arranged on a driven shaft. The turbomachine has an inflow region ( 21 ) and an outflow region ( 22 ) and, in operation, is flowed through by a working medium. The working medium flows into the inflow region, along a front side ( 23 a ) formed on the impeller and subsequently out of the outflow region, there being a pressure drop at the front side between the inflow region and the outflow region. A pressure divider ( 9 ) is arranged on the rear side of the impeller, opposite the front side.

First claim

The invention claimed is:

1. A turbomachine ( 20 ) with a casing ( 26 ), wherein an impeller ( 23 ), which is arranged on an output shaft ( 24 ) for rotation about an axis, is arranged in the casing ( 26 ), wherein the turbomachine ( 20 ) has an inflow region ( 21 ) and an outflow region ( 22 ) and during operation is exposed to a throughflow of working medium, wherein the working medium flows into the inflow region ( 21 ), along a front side ( 23 a ) which is formed on the impeller ( 23 ) and then flows out of the outflow region ( 22 ), wherein a pressure drop exists on the front side ( 23 a ) between the inflow region ( 21 ) and the outflow region ( 22 ), wherein a pressure divider ( 9 ) is arranged on a rear side ( 23 b ) of the impeller ( 23 ) which is opposite the front side ( 23 a ) so that during operation at least a part of the rear side ( 23 b ) is loaded with a lower pressure than the pressure of the inflow region ( 21 ), characterized in that the pressure divider ( 9 ) comprises a slide ring ( 31 ) which, at a first operating point of the turbomachine ( 20 ), presses directly in an axial direction against the rear side ( 23 b ) of the impeller ( 23 ), and which, at a second operating point of the turbomachine ( 20 ) with higher speed than the first operating point, floats on a cushion of the working medium that lifts the slide ring ( 31 ) away from the rear side ( 23 b ) to form a throttling point.

2. The turbomachine ( 20 ) as claimed in claim 1 , characterized in that a shaft sealing ring ( 25 ) is arranged on the casing ( 26 ), wherein the shaft sealing ring ( 25 ) interacts with the output shaft ( 24 ) and wherein a pressure chamber ( 11 ) is formed between the casing ( 26 ), the shaft sealing ring ( 25 ), the impeller ( 23 ) and the pressure divider ( 9 ).

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

4. The turbomachine ( 20 ) as claimed in claim 3 , characterized in that a hydraulic connection from the pressure chamber ( 11 ) to the outflow region ( 22 ) is effected via at least one hole ( 24 a , 24 b , 24 c ) which is formed in the output shaft ( 24 ).

5. The turbomachine ( 20 ) as claimed in claim 1 , characterized in that the pressure divider ( 9 ) subdivides the rear side ( 23 b ) with regard to the pressure load during operation into a first region ( 231 ) and a second region ( 232 ), wherein the first region ( 231 ) is loaded with a higher pressure than the second region ( 232 ).

6. The turbomachine ( 20 ) as claimed in claim 5 , characterized in that the first region ( 231 ) is acted upon by the pressure level of the inflow region ( 21 ).

7. The turbomachine ( 20 ) as claimed in claim 5 , characterized in that the second region ( 232 ) is acted upon by the pressure level of the outflow region ( 22 ).

8. The turbomachine ( 20 ) as claimed in claim 1 , characterized in that the turbomachine ( 20 ) is constructed as a radial turbine.

9. A waste heat recovery system ( 1 ) with the turbomachine ( 20 ), as claimed in claim 1 , a condenser ( 28 ), a pump ( 30 ) and an evaporator ( 27 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Wengert Andreas
• Banzhaf Bernd
• Rueckert Frank Ulrich
• Eisenmenger Nadja

Classifications

• F01D3/04 Primary

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

• F05D2220/40

  in turbochargers · CPC title

• F02C6/12

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