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EP-4739890-A1 - TURBOMACHINE WITH HEAT SHIELD

EP4739890A1EP 4739890 A1EP4739890 A1EP 4739890A1EP-4739890-A1

Abstract

The invention relates to a turbomachine (10). The turbomachine (10) comprises a shaft (12) which is mounted in a bearing housing (11) and on which a rotor (13) is located. The turbomachine (10) further comprises a heat shield (14), which is located between the bearing housing (11) and a gas outlet housing (15) of the turbomachine. The heat shield (14) has a radially outer fastening element receptacle (141) for fastening the heat shield (14) to the bearing housing (11) using a fastening element (16). The fastening element receptacle (141) is located between the bearing housing (11) and the gas outlet housing (15). The fastening element receptacle (141) is an axial fastening element receptacle. The fastening element (16) extends through the axial fastening element receptacle.

Inventors

  • PANDOLFO, Philippe
  • DI-PIETRO, MARCO

Assignees

  • Accelleron Switzerland Ltd.

Dates

Publication Date
20260513
Application Date
20240618

Claims (14)

  1. 1. Turbomachine (10), comprising: - a shaft (12) mounted in a bearing housing (11) on which a rotor (13) is arranged, - a heat shield (14) which is arranged between the bearing housing (11) and a gas outlet housing (15) of the turbomachine, wherein the heat shield (14) has a radially outer fastening means receptacle (141) in order to fasten the heat shield (14) to the bearing housing (11) by means of a fastening means (16), wherein the fastening means receptacle (141) is arranged between the bearing housing (11) and the gas outlet housing (15), wherein the fastening means receptacle (141) is an axial fastening means receptacle, and wherein the fastening means (16) extends through the axial fastening means receptacle.
  2. 2. Turbomachine (10) according to claim 1, wherein a first air-filled insulation space (17) is provided between the fastening means receptacle (141) and the gas outlet housing (15).
  3. 3. Turbomachine (10) according to claim 1 or 2, wherein a second air-filled insulation space (18) is provided between a radially outer region (144) of the heat shield (14) and the bearing housing (11).
  4. 4. Turbomachine (10) according to claim 3, wherein a maximum radial extent R 2m ax of the second air-filled insulation space (18) from a central axis of rotation (121) of the shaft (12) is less than a maximum radial extent Ri max of the first air-filled insulation space (17).
  5. 5. Turbomachine (10) according to one of claims 1 to 4, wherein the Heat shield (14) provides a bearing housing side wall (21) of a gas outlet channel (20) of the turbomachine.
  6. 6. Turbomachine (10) according to claim 5, wherein a third air-filled insulation space (19) is provided between the bearing housing-side side wall (21) of the gas outlet channel (20) and the bearing housing (11).
  7. 7. Turbomachine (10) according to one of claims 1 to 6, wherein the bearing housing (11) comprises an oil chamber (111), and wherein contact of the fastening means receptacle (11) with the bearing housing (11) takes place in a radially outer region (112) of the bearing housing (11), in which the oil chamber extends completely.
  8. 8. Turbomachine (10) according to one of claims 1 to 6, wherein the bearing housing (11) comprises an oil chamber (111), and wherein contact of the fastening means receptacle (141) with the bearing housing (11) takes place in a radially outer region (112) of the bearing housing (11), in which the oil chamber does not extend or only partially extends.
  9. 9. Turbomachine (10) according to one of claims 1 to 8, wherein the fastening means 16 extends into a cooling structure 117 which is arranged in an oil chamber 111 of the bearing housing 11.
  10. 10. Turbomachine (10) according to one of claims 1 to 9, wherein a radial gap (S) is present between the fastening means receptacle (141) and the gas outlet housing (15).
  11. 11. Turbomachine (10) according to one of claims 1 to 10, wherein the bearing housing (11) has a seat (113), in particular a radial seat, for a complementary seat (142) of the heat shield (14).
  12. 12. Turbomachine (10) according to claim 11, wherein the complementary seat (142) of the heat shield (14) is connected to the fastening means receptacle (141) via a substantially radially extending web (143).
  13. 13. Turbomachine (10) according to one of claims 1 to 12, wherein at an interface between the gas outlet housing (15) and the Heat shield (14) a seal (151), in particular a labyrinth seal, is provided.
  14. 14. Turbomachine (10) according to one of claims 1 to 13, wherein the turbomachine is an axial exhaust gas turbine and the rotor (13) is a turbine wheel, in particular a turbine disk.

Description

TURBO MACHINE WITH HEAT SHIELD TECHNICAL FIELD [0001] The invention relates to the field of turbomachines, in particular exhaust gas turbines. In particular, the invention relates to a turbomachine with a heat shield. TECHNICAL BACKGROUND [0002] To increase the performance of an internal combustion engine, exhaust gas turbochargers are now used as standard, with a turbine in the exhaust tract of the internal combustion engine and a compressor upstream of the internal combustion engine. The exhaust gases of the internal combustion engine are expanded in the turbine. The work gained is transferred by means of a shaft to the compressor, which compresses the air supplied to the internal combustion engine. By using the energy of the exhaust gases to compress the air supplied to the combustion process in the internal combustion engine, the combustion process and the efficiency of the internal combustion engine can be optimized. [0003] In turbomachines, especially in exhaust gas turbochargers, so-called heat shields are often used. The primary task of heat shields is to reduce the heat input from the turbine side into the bearing housing. There are essentially two different variants for the design of heat shields. On the one hand, the heat shields are designed as solid machined and partially cast components, on the other hand, there are also versions made of sheet metal formed parts. are used. Both variants are usually clamped on the outer circumference. [0004] It has been found that the heat shields known from the prior art can still be improved, in particular with regard to their fastening and heat insulation efficiency, in particular in the area of fastening of the heat shield. [0005] The object of the present invention is to provide a turbomachine with a heat shield with which one or more disadvantages known from the prior art can be partially or completely overcome. BRIEF DESCRIPTION OF THE INVENTION [0006] To achieve the above-mentioned objects, a turbomachine with a heat shield according to the independent claim is provided. Further aspects, advantages and features of the present invention can be found in the dependent claims, the description and the accompanying figures. [0007] According to one aspect of the invention, a turbomachine, in particular an exhaust gas turbine, is provided. The turbomachine comprises a shaft mounted in a bearing housing on which a rotor is arranged. The turbomachine further comprises a heat shield which is arranged between the bearing housing and a gas outlet housing of the turbomachine. The heat shield has a radially outer fastening means receptacle in order to fasten the heat shield to the bearing housing by means of a fastening means. The fastening means receptacle is arranged between the bearing housing and the gas outlet housing, wherein the fastening means receptacle is an axial fastening means receptacle. The fastening means extends through the axial fastening means receptacle. [0008] Thus, a turbomachine with a heat shield is advantageously provided which is improved compared to the turbomachines with heat shields known from the prior art with regard to the reduction of the heat input from the turbine side into the bearing housing. In particular, the heat transfer or heat transmission between the gas outlet housing and the fastening of the heat shield can advantageously be reduced by the embodiments described here. BRIEF DESCRIPTION OF THE CHARACTERS [0009] The invention will be explained below with reference to embodiments shown in figures, from which further advantages and modifications emerge. Here: Figure 1 is a schematic sectional view of a turbomachine according to embodiments described herein; Figure 2 is a schematic sectional view of a section of a turbomachine with a heat shield attachment according to embodiments described herein; and Figure 3 is a schematic sectional view of a section of a turbomachine with a heat shield attachment according to further embodiments described herein with a cooling structure. DETAILED DESCRIPTION OF THE FIGURES [0010] Various embodiments are described below, one or more examples of which are shown in each figure. Each example is for illustrative purposes and is not to be understood as limiting. For example, features which are part of one embodiment may be applied to or used in conjunction with any other embodiment to yield another embodiment. The present disclosure is intended to include such modifications and variations. [0011] In the following description of the drawings, the same reference numbers refer to the same or similar components. In general, only the differences with respect to the individual embodiments will be described. Unless otherwise stated, the description of a part or aspect in one embodiment may also refer to a corresponding part or aspect in another embodiment. [0012] With reference to Figures 1 and 2, a turbomachine 10 is described according to embodiments of the present disclosure. In particular, the tur