• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Fluid flow machine, with a diffuser (12) provided downstream of an impeller (11), bounded by an inner shell (13) and an outer shell (14), with a collecting space (15) provided downstream of the diffuser (12), the diffuser ( 12) opens in the radial direction into the collecting space (15) with an opening cross section (16), with an outlet-side end (17) of the outer shell (14) of the diffuser (12), which adjoins the collecting space (15) or into the collecting space ( 15) protrudes. The outlet-side end (17) of the outer shell (14) has a surface section (18) facing the collecting space (15) and extending in cross section in the radial direction. The surface section (18) of the outlet end (17) of the outer shell (14), which extends in the radial direction and faces the collecting space (15), goes with a surface section (19) contoured in the shape of a circular segment in cross section into a surface section (20) facing the diffuser (12) ) of the outlet end (17) of the outer shell (14).
    公开号:CH715785A2
    申请号:CH00005/20
    申请日:2020-01-03
    公开日:2020-07-31
    发明作者:Niebuhr Johannes；Kummert Katharina
    申请人:Man Energy Solutions Se；
    IPC主号:
    专利说明:

    The invention relates to a turbomachine according to the preamble of claim 1.
    The basic structure of a turbocharger is known to the person skilled in the art addressed here. A turbocharger has a turbine in which a first medium is expanded. Furthermore, a turbocharger has a compressor in which a second medium is compressed using the energy obtained in the turbine when the first medium is expanded. The turbine of the turbocharger has a turbine housing and a turbine rotor. The compressor of the turbocharger has a compressor housing and a compressor rotor. A bearing housing is positioned between the turbine housing of the turbine and the compressor housing of the compressor, the bearing housing being connected on the one hand to the turbine housing and on the other hand to the compressor housing. A shaft via which the turbine rotor is coupled to the compressor rotor is mounted in the bearing housing.
    From DE 101 37 899 C1 a turbine of a turbocharger designed as an axial turbine is known, which has a diffuser which is connected to the turbine wheel and is delimited by an inner shell and an outer shell. Viewed in the flow direction of the exhaust gas, a collecting space adjoins the diffuser, the diffuser merging in the radial direction into the collecting space with an opening cross-section or opening into the collecting space. An exhaust gas flow line leads away from the plenum. At an outlet-side or outlet-side end of the outer shell of the diffuser, an edge is formed which protrudes into or adjoins the collecting space, specifically adjoining the opening cross-section of the diffuser.
    The flow should pass from the diffuser as undisturbed as possible into the collecting space. This causes difficulties in turbo machines known from practice, in particular flow detachments can occur in the area of the outlet end of the outer shell of the diffuser which protrudes into the collecting space or is adjacent to the collecting space. This is a disadvantage.
    There is therefore a need for a turbomachine in which a flow, starting from a diffuser, can flow over undisturbed into a collecting space adjoining the diffuser.
    Proceeding from this, the invention is based on the object of creating a novel flow machine. This object is achieved by a turbomachine according to claim 1.
    According to the invention, the outlet end of the outer shell has a surface portion facing the collecting space, which extends in cross section in the radial direction. The surface section of the outlet-side end of the outer shell, which extends in the radial direction and faces the collecting space, merges with a surface section with a circular segment-shaped contour in cross section into a surface section of the outlet-side end of the outer shell facing the diffuser.
    The inventive design of the turbomachine at the outlet end of the outer shell of the diffuser can ensure that a flow from the diffuser can flow over undisturbed into the collecting space. In particular, flow separation and turbulence can be avoided. In this way, flow losses can be minimized and the efficiency increased.
    The surface section contoured in the shape of a segment of a circle preferably merges tangentially into the surface section facing the collecting space and / or into the surface section facing the diffuser. Such a contouring of the outer shell of the diffuser at the outlet end is particularly preferred in order to minimize flow losses.
    According to an advantageous development, the surface section extending in the radial direction of the outlet end of the outer shell of the diffuser has a length L in the radial direction for which: 0.1 * X≤L≤X, where X is the dimension of the mouth cross section Diffuser is in the axial direction. According to a further advantageous development, the circular segment-shaped contoured surface section of the outlet end of the outer shell of the diffuser has a radius R for which: 0.1 * X X R ≤ X, where X is the dimension of the mouth cross section of the diffuser in the axial direction. When one or preferably both of these conditions are met, the flow from the diffuser can particularly advantageously pass into the collecting space in order to minimize flow losses.
    [0011] The turbo machine is preferably an axial turbine, particularly preferably a turbocharger. The invention is particularly advantageous when used on a turbomachine designed as an axial turbine of a turbocharger.
    [0012] Preferred developments of the invention emerge from the subclaims and the following description. Embodiments of the invention are explained in more detail with reference to the drawing, without being restricted thereto. It shows:<tb> Fig. 1 <SEP> shows a schematic, partial cross-section through a turbomachine according to the invention.
    Fig. 1 shows a highly schematic, partial cross-section, namely meridional section, of a fluid flow machine designed as an axial turbine 10 of an exhaust gas turbocharger, an impeller 11 of the axial turbine 10 having an axial flow against it and an axial flow away. Downstream of the turbine impeller 11 there is a diffuser 12, which deflects the flow in the axial turbine 10 from axial to radial, the diffuser 12 being delimited by an inner shell 13 and an outer shell 14. Viewed in the direction of flow of the exhaust gas, a collecting space 15 adjoins the diffuser 12. Exhaust gas which enters or flows over the collecting space 15 via the diffuser 12 can be discharged from the collecting space 15 via an outflow line (not shown).
    The diffuser 12 opens with an opening cross-section 16 into the collecting space 15. As already stated, the diffuser 12 and thus the opening cross-section 16 is limited on the one hand by the inner shell 13 and on the other hand by the outer shell 14.
    At the outlet end 17 of the diffuser 12 and thus at the outlet end 17 of the outer shell 14, the outer shell 14 has a defined contouring, namely such that the outlet end 17 of the outer shell 14 has a surface section 18 facing the collecting space, which in cross section, namely in the meridional section of FIG. 1, extends in the radial direction, specifically exclusively in the radial direction.
    This surface section 18 of the outlet end 17 of the outer shell 14, which extends exclusively in the radial direction in the meridional section and faces the collecting space 15, goes with a surface section 19 with a circular segment contour in cross section or meridional section into a surface section 20 of the outlet end 17 facing the diffuser 12 the outer shell 14 over.
    It is preferably provided that the circular segment-shaped contoured surface section 19 of the outlet end 17 of the outer shell 14 into the surface section 18 facing the collecting space 15, which extends exclusively in the radial direction in the meridional section, and into the surface section 20 facing the diffuser 12, which follows the contour of the diffuser 12, in each case tangentially, ie continuously, transitions.
    The outlet end 17 of the outer shell 14 of the diffuser 12 adjoins the collecting space 15 or protrudes at least in sections into the collecting space 15.
    Seen in the meridional section, the outlet end 17 of the outer shell 14, which limits the diffuser 12 on the outside, characterized by two geometric parameters, namely by a length L of the radially extending surface section 18 and by a radius R of the circular segment-shaped contoured surface section 19th
    Preferably one, particularly preferably both, of the following conditions apply:0.1 * X≤L≤X0.1 * X≤R≤Xin whichL is the length of the surface section 18 extending in the radial direction,R is the radius of the surface section 19 contoured in the shape of a circular segment,X is the dimension of the mouth cross section 16 of the diffuser in the axial direction.
    The outlet end 17 of the outer shell 14 of the diffuser 12 forms a bead-like thickening which, in the meridional section of FIG. 1, has a thicker wall thickness than an adjacent section of the outer shell 14.
    With such a designed outlet end 17 of the outer shell 14, which limits the diffuser 12 in the area of the mouth cross-section 16, a particularly advantageous and loss-free transfer of the flow from the diffuser 12 into the plenum 15 adjoining the diffuser 12 is ensured become. The efficiency of the turbo machine can be increased by minimizing flow losses.
    The invention is preferably used in an axial turbine of a turbocharger. Although the invention is particularly preferred in this application, the invention can also be used in other turbomachines with a diffuser and a collecting space adjoining the diffuser, in which a flow starting from the diffuser in the radial direction into those adjoining the diffuser or subsequent collecting space passes.
    List of reference symbols
    10 flow machine 11 impeller 12 diffuser 13 inner shell 14 outer shell 15 collecting space 16 mouth cross-section 17 outlet-side end 18 surface section 19 surface section 20 surface section
    权利要求:
    Claims (9)
    [1]
    1. flow machine,with a diffuser (12) provided downstream of an impeller (11) and delimited by an inner shell (13) and an outer shell (14),with a collecting space (15) provided downstream of the diffuser (12), the diffuser (12) opening in the radial direction into the collecting space (15) with an opening cross-section (16),with an outlet-side end (17) of the outer shell (14) of the diffuser (12), which adjoins the collecting space (15) or protrudes at least in sections into the collecting space (15),characterized in thatthe outlet end (17) of the outer shell (14) has a surface section (18) facing the collecting space (15) and extending in cross section in the radial direction,the surface section (18) of the outlet end (17) of the outer shell (14) extending in the radial direction and facing the collecting space (15) with a surface section (19) contoured in the shape of a circular segment in cross section into a surface section (20) facing the diffuser (12) of the outlet end (17) of the outer shell (14) merges.
    [2]
    2. Turbomachine according to claim 1, characterized in that the circular segment-shaped contoured surface section (19) merges tangentially into the surface section (18) facing the collecting space (15).
    [3]
    3. Turbomachine according to claim 1 or 2, characterized in that the circular segment-shaped contoured surface section (19) merges tangentially into the surface section (20) facing the diffuser (12).
    [4]
    4. Turbomachine according to one of Claims 1 to 3, characterized in that the surface section (18) facing the collecting space (15) extends in cross section exclusively in the radial direction.
    [5]
    5. Turbomachine according to one of Claims 1 to 4, characterized in that the surface section (18) extending in the radial direction has a length L in the radial direction for which the following applies:0.1 * X≤L≤X,where X is the dimension of the mouth cross section (16) of the diffuser (12) in the axial direction.
    [6]
    6. Turbo machine according to one of Claims 1 to 5, characterized in that the surface section (19) contoured in the shape of a segment of a circle has a radius R for which:0.1 * X≤R≤X,where X is the dimension of the mouth cross section (16) of the diffuser (12) in the axial direction.
    [7]
    7. Turbomachine according to one of Claims 1 to 6, characterized in that it is an axial turbine.
    [8]
    The turbo machine according to claim 7, characterized in that the axial turbine is a turbine of a turbocharger.
    [9]
    9. Fluid machine according to one of Claims 1 to 8, characterized in that the respective cross-section is a meridional section.
    类似技术:
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    同族专利:
    公开号 | 公开日
    RU2020100836A|2021-07-14|
    JP2020118160A|2020-08-06|
    CN111502772A|2020-08-07|
    DE102019101602A1|2020-07-23|
    US20200232478A1|2020-07-23|
    KR20200091803A|2020-07-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102019101602.9A|DE102019101602A1|2019-01-23|2019-01-23|Fluid machine|
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