Variable capacity turbine
First Claim
1. A radial in-flow turbine comprising a turbine wheel, a turbine scroll passage defined in a turbine casing around the turbine wheel for introduction of gas to the turbine wheel, and an axial central passage defined in the turbine casing for ejection of gas from the turbine wheel. wherein:
- a plurality of variable nozzles, having an axial width, are arranged concentrically with respect to the turbine wheel and inside of the turbine casing and outside of an annular throat section defined inside the turbine casing concentric to the turbine wheel and having a locally minimum axial width less than said nozzle axial width, said variable nozzles are defined by fixed vanes and moveable vanes.
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Accused Products
Abstract
Disclosed is a turbine comprising a turbine wheel, a turbine scroll passage defined in a turbine casing around the turbine wheel for introduction of gas to the turbine wheel, and an axial central passage defined in the turbine casing for ejection of gas from the turbine wheel, wherein: a plurality of variable nozzles are arranged outside of a throat section having a locally minimum cross section which is defined in the turbine casing around the turbine wheel. The variable nozzles may be defined by fixed vanes and moveable vanes which cooperate with each other in such a manner that each of the moveable vanes and the corresponding fixed vane define a substantially smooth and continuous airfoil. The moveable vanes may be pivotally supported by a back plate of the casing while the fixed vanes may be integrally provided with a fixed vane member having a disk portion which defines a surface opposing the inner surface of the back plate. The moveable vanes may rotate along and between these mutually opposing surfaces for varying the cross section of the nozzles defined between the fixed vanes and the moveable vanes.
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Citations
17 Claims
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1. A radial in-flow turbine comprising a turbine wheel, a turbine scroll passage defined in a turbine casing around the turbine wheel for introduction of gas to the turbine wheel, and an axial central passage defined in the turbine casing for ejection of gas from the turbine wheel. wherein:
a plurality of variable nozzles, having an axial width, are arranged concentrically with respect to the turbine wheel and inside of the turbine casing and outside of an annular throat section defined inside the turbine casing concentric to the turbine wheel and having a locally minimum axial width less than said nozzle axial width, said variable nozzles are defined by fixed vanes and moveable vanes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A turbine comprising a turbine wheel, a turbine scroll passage defined in a turbine casing around the turbine wheel for introduction of gas to the turbine wheel, and an axial central passage defined in the turbine casing for ejection of gas from the turbine wheel, comprising:
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a plurality of fixed vanes and movable vanes arranged around the turbine wheel in alternating fashion located inside said turbine casing and outside of an annular throat section; each of the movable vanes being pivoted at its base end adjacent to a trailing edge of an adjacent one of the fixed vanes rotatable between a first position, in which the fixed vanes and movable vanes are substantially aligned with a circle and a free end of the movable vane adjoins a leading edge of the adjacent fixed vane along a circumferential direction so as to define a minimally open nozzle therebetween, and a second position, in which said movable vanes are rotated inwardly toward the turbine wheel so as to define a maximally open nozzle between the free end of each of the movable vanes and the leading edge of the corresponding adjacent fixed vane. - View Dependent Claims (14, 15)
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16. A radial in-flow turbine comprising a turbine wheel, a turbine scroll passage defined in a turbine casing around the turbine wheel for introduction of gas to the turbine wheel, and an axial central passage defined in the turbine casing for ejection of gas from the turbine wheel, wherein:
a plurality of variable nozzles located inside said turbine casing and outside of an annular throat section, said nozzles comprised of a plurality of moveable vanes and fixed vanes arranged around the turbine wheel;
the moveable vanes and fixed vanes being substantially aligned along a circle concentric to the turbine wheel and presenting substantially smooth inner and outer circumferential contour surfaces when the moveable vanes are positioned to define a minimally open state of the variable nozzles.
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17. A radial in-flow turbine comprising a turbine wheel, a turbine scroll passage defined in a turbine casing around the turbine wheel for introduction of gas to the turbine wheel, and an axial central passage defined in the turbine casing for ejection of gas from the turbine wheel, wherein:
a plurality of variable nozzles located inside said turbine casing and outside of an annular throat section, said nozzles comprised of a plurality of moveable vanes and fixed vanes having ends, said moveable vanes and fixed vanes arranged around the turbine wheel, and each of the moveable vanes and the corresponding fixed vanes define an airfoil having a substantially smooth contour, the end of each of the fixed vanes remote from the corresponding moveable vane defining the leading edge of the airfoil while the end of the moveable vane remote from the corresponding fixed vane defines the trailing edge of the airfoil.
Specification