Variable displacement turbine
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsKatsuyuki Osako, Yasuaki Jinnai
Life of this patent
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Abstract
A support pin (24) is disposed at a position in front of a front edge (19a) of a movable nozzle blade (19) in a state in which the movable nozzle blade (19) is located at a rating opening position B, set between a maximum opening position A and a minimum opening position C. The aerodynamic effect of the support pin when the flow rate is small is thus reduced, and the turbine efficiency when the flow rate is small is enhanced.
Claims8
A variable displacement turbine in which a plurality of movable nozzle blades are rotatably provided between opposed two side wall surfaces around an outer periphery of a turbine blade wheel by shaft bodies, respectively, a clearance setting support pin extending across between the two side wall surfaces is provided in order to maintain a distance between the two side wall surfaces at an appropriate value, wherein
- the support pin is disposed on an extension line or in the vicinity of the extension line of a logarithmic spiral which passes a blade thickness central portion of the movable nozzle blade located in a rating opening position (α=20°±5°) which is set between a maximum opening position and a minimum opening position.
A variable displacement turbine in which a plurality of movable nozzle blades are rotatably provided between opposed two side wall surfaces around an outer periphery of a turbine blade wheel by shaft bodies, respectively, a clearance setting support pin extending across between the two side wall surfaces is provided in order to maintain a distance between the two side wall surfaces at an appropriate value, wherein
- the support pin is disposed at a position closer to a front edge of the movable nozzle blade than a rotation center position of the movable nozzle blade on the side of a pressure surface of the movable nozzle blade without contacting with the movable nozzle blade located at a maximum opening position.
A variable displacement turbine in which a plurality of movable nozzle blades are rotatably provided between two opposed side wall surfaces around an outer periphery of a turbine blade wheel by respective shaft bodies, a clearance setting support pin extending across between the two side wall surfaces is provided to maintain a distance between the two side wall surfaces at an appropriate value, wherein
- the support pin is disposed on an extension line or in the vicinity of the extension line of a logarithmic spiral which passes a blade thickness central portion of one of the movable nozzle blades located at a rating opening position, α=20°+/−5°, which is set between a maximum opening position and a minimum opening position.
Dependencies are inferred from the claim text.