膨張タービン及びターボチャージャ

Japanese Patent JP6426191

B2

An expansion turbine (10A) includes: a turbine housing (13) including a scroll section for taking in working fluid (w); a plurality of variable nozzles (36) disposed inside the turbine housing at intervals in a circumferential direction of the expansion turbine, each of the variable nozzles being configured to be rotatable about a rotation shaft (38); and a turbine wheel (24) disposed rotatably inside the turbine housing, the turbine wheel including a plurality of turbine blades disposed downstream of the variable nozzles. The turbine housing has a first wall surface (50) including a shroud section which faces tips (28a) of the turbine blades, and a second wall surface (52) which faces the first wall surface across a flow path (f) of the working fluid. A blade height of the variable nozzles at an outlet side is greater than a blade height of the turbine blades at an inlet side. The first wall surface has a protruding portion (44) protruding toward the second wall surface so as to reduce a height of the flow path of the working fluid toward downstream, at a downstream side of an outlet of the variable nozzles and an upstream side of an inlet of the turbine blades, and a protruding amount of the protruding portion is set so that a tip end of the protruding portion does not protrude toward the second wall surface past the tips of the turbine blades at the inlet.

Toyotaka Yoshida
Takao Yokoyama
Danmoto Yosuke
Yoji Akiyama

JP2016545164A

November 21, 2018

August 28, 2014

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Mitsubishi Heavy Industries Engine & Turbocharger Co., Ltd.

F01D25/24; F02B37/24; F02B39/00

JP20122140A
JP2011149306A
JP60153403A
JP62101038U
JP62152034U

Seishin ip patent business corporation

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