A variable geometry turbine comprises a turbine wheel and a primary inlet passage of variable axial width. The turbine has a secondary inlet passage provides a flow path for a working fluid which circumnavigates at least part of the primary inlet passage. A seal element and one or more apertures are
A variable geometry turbine comprises a turbine wheel and a primary inlet passage of variable axial width. The turbine has a secondary inlet passage provides a flow path for a working fluid which circumnavigates at least part of the primary inlet passage. A seal element and one or more apertures are cooperable to selectively allow or prevent fluid flow through the secondary inlet passage. The turbine wheel is of the radial-inflow axial-outflow type and secondary inlet passage has an outlet configured to direct working fluid to exit the secondary inlet passage in a direction which has an axial component in the opposite direction to the direction of axial outflow of the turbine wheel.
대표청구항▼
1. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis, the turbine wheel being a radial-inflow axial-outflow turbine wheel and the housing having a first wall;an axially movable operating member having a second wall;a primary inlet passag
1. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis, the turbine wheel being a radial-inflow axial-outflow turbine wheel and the housing having a first wall;an axially movable operating member having a second wall;a primary inlet passage upstream of the turbine wheel, the inlet passage being defined between the first wall of the housing and the second wall of the operating member, the axial width of the inlet passage being controllable by moving the operating member between a first axial position in which the second wall is axially distal from the first wall, and a second axial position in which the second wall is axially proximal to the first wall;a secondary inlet passage configured to provide a bypass flow path for a working fluid which circumnavigates at least part of the primary inlet passage;a seal element and one or more apertures, one of the seal element and the one or more apertures being axially fixed relative to the housing and the other being axially fixed relative to the operating member and movable therewith, the one or more apertures and the seal element thereby being axially movable relative to one another between a first configuration and a second configuration via movement of the operating member, wherein:with the one or more apertures and the seal element in the first configuration the seal element is positioned in the bypass flow path to substantially prevent fluid flow therethrough, and with the one or more apertures and the seal element in the second configuration the seal element is positioned to allow flow of fluid through the one or more apertures and thereby through the secondary inlet passage;the seal element and the one or more apertures are arranged whereby moving the operating member to the first position positions the seal element and the one or more apertures in the first configuration, and moving the operating member to the second position positions the one or more apertures and the seal element in the second configuration;the secondary inlet passage has an outlet configured to direct working fluid to exit the secondary inlet passage in a direction which has an axial component in the opposite direction to a direction of axial outflow of the turbine wheel: andthe secondary inlet passage is annular in shape and is circumferentially arranged about the turbine axis. 2. A turbine according to claim 1 wherein the outlet is configured to direct working fluid to exit the secondary inlet passage in a direction at an angle of more than 160 degrees to the direction of axial outflow of the turbine wheel. 3. A turbine according to claim 2 wherein the outlet is configured to direct working fluid to exit the secondary inlet passage in a direction opposite to the direction of axial outflow of the turbine wheel. 4. A turbine according to claim 1 wherein the secondary inlet passage is configured to provide a flow path for a working fluid which circumnavigates substantially the entire primary inlet passage. 5. A turbine according to claim 1 wherein the one or more apertures comprises a plurality of apertures. 6. A turbine according to claim 5 wherein the plurality of apertures comprises at least 6 apertures. 7. A turbine according to claim 5 wherein the plurality of apertures are provided in an annular array circumferentially disposed around the turbine axis. 8. A turbine according to claim 1 wherein each aperture of the one or more apertures takes the form of a through-bore, and defines a longitudinal axis which is aligned in a substantially radial direction. 9. A turbine according to claim 1 wherein the housing defines a support structure and the operating member takes the form of a sleeve mounted on said support structure, the secondary inlet passage being at least partially defined between a radially inner surface of the sleeve and a radially outer surface of the support structure. 10. A turbine according to claim 9 wherein each of the one or more apertures takes the form of a through-bore running from a radially outer surface of the sleeve to a radially inner surface of the sleeve. 11. A turbocharger comprising the variable geometry turbine of claim 1. 12. An internal combustion engine comprising the turbocharger of claim 11. 13. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis, the turbine wheel being a radial-inflow axial-outflow turbine wheel and the housing having a first wall;an axially movable operating member having a second wall;a primary inlet passage upstream of the turbine wheel, the inlet passage being defined between the first wall of the housing and the second wall of the operating member, the axial width of the inlet passage being controllable by moving the operating member between a first axial position in which the second wall is axially distal from the first wall, and a second axial position in which the second wall is axially proximal to the first wall;a secondary inlet passage configured to provide a bypass flow path for a working fluid which circumnavigates at least part of the primary inlet passage;a seal element and one or more apertures, one of the seal element and the one or more apertures being axially fixed relative to the housing and the other being axially fixed relative to the operating member and movable therewith, the one or more apertures and the seal element thereby being axially movable relative to one another between a first configuration and a second configuration via movement of the operating member, wherein:with the one or more apertures and the seal element in the first configuration the seal element is positioned in the bypass flow path to substantially prevent fluid flow therethrough, and with the one or more apertures and the seal element in the second configuration the seal element is positioned to allow flow of fluid through the one or more apertures and thereby through the secondary inlet passage;the seal element and the one or more apertures are arranged whereby moving the operating member to the first position positions the seal element and the one or more apertures in the first configuration, and moving the operating member to the second position positions the one or more apertures and the seal element in the second configuration;the secondary inlet passage has an outlet configured to direct working fluid to exit the secondary inlet passage in a direction which has an axial component in the opposite direction to a direction of axial outflow of the turbine wheel; andeach aperture of the one or more apertures takes the form of a through-bore, and defines a longitudinal axis which is aligned in a substantially radial direction. 14. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis, the turbine wheel being a radial-inflow axial-outflow turbine wheel and the housing having a first wall;an axially movable operating member having a second wall;a primary inlet passage upstream of the turbine wheel, the inlet passage being defined between the first wall of the housing and the second wall of the operating member, the axial width of the inlet passage being controllable by moving the operating member between a first axial position in which the second wall is axially distal from the first wall, and a second axial position in which the second wall is axially proximal to the first wall;a secondary inlet passage configured to provide a bypass flow path for a working fluid which circumnavigates at least part of the primary inlet passage;a seal element and one or more apertures, one of the seal element and the one or more apertures being axially fixed relative to the housing and the other being axially fixed relative to the operating member and movable therewith, the one or more apertures and the seal element thereby being axially movable relative to one another between a first configuration and a second configuration via movement of the operating member, wherein:with the one or more apertures and the seal element in the first configuration the seal element is positioned in the bypass flow path to substantially prevent fluid flow therethrough, and with the one or more apertures and the seal element in the second configuration the seal element is positioned to allow flow of fluid through the one or more apertures and thereby through the secondary inlet passage;the seal element and the one or more apertures are arranged whereby moving the operating member to the first position positions the seal element and the one or more apertures in the first configuration, and moving the operating member to the second position positions the one or more apertures and the seal element in the second configuration;the secondary inlet passage has an outlet configured to direct working fluid to exit the secondary inlet passage in a direction which has an axial component in the opposite direction to a direction of axial outflow of the turbine wheel;the housing defines a support structure and the operating member takes the form of a sleeve mounted on said support structure, the secondary inlet passage being at least partially defined between a radially inner surface of the sleeve and a radially outer surface of the support structure; andeach of the one or more apertures takes the form of a through-bore running from a radially outer surface of the sleeve to a radially inner surface of the sleeve.
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이 특허에 인용된 특허 (4)
Moser Peter (Boppelsen CHX), Controllable exhaust gas turbocharger.
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