US 4,544,326 AGranted

Variable-capacity radial turbine

AssigneeNissan Motor Co., Ltd.

InventorsFumio Nishiguchi, Hiroshi Komatsu

Life of this patent

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Abstract

A turbine scroll passage of a turbine is divided into first and second scroll passages extending in parallel to each other along the scroll passage. The first passage is formed with a side aperture for directing the fluid in the scroll passage to a turbine wheel. The second passage is isolated from the side aperture by a partition wall separating the second passage from the first passage. The partition wall is formed with a longitudinally extending opening for providing a fluid communication between the first and second passages. The opening extends longitudinally through about 360 degrees around the axis of the turbine, and has a constant width over its length. In the secondary passage, there is disposed a valve of a swing, rotary or other type, for closing the secondary passage. When the turbine is a part of a turbocharger connected with an internal combustion engine, the secondary passage is closed by the valve in a low engine speed range. The opening of the partition wall and the valve are designed in various ways.

Claims25

Dependent claims

A variable-capacity radial turbine, comprising:

a turbine wheel,
a turbine housing enclosing said turbine wheel, said turbine housing having an inlet port for receiving a fluid, a scroll passage for directing the stream of the fluid from said inlet port to said turbine wheel, a turbine wheel chamber containing said turbine wheel, and an outlet passage for discharging the fluid from said wheel chamber, said scroll passage being divided into a first scroll passage and a second scroll passage by a partition wall extending longitudinally in the scroll passage so as to form two parallel flow paths, said first scroll passage being formed with a side aperture through which the fluid in said first passage is allowed to flow toward the outer periphery of said turbine wheel, said partition wall being formed with an opening through which the fluid is allowed to flow between said first and second passages, said opening extending longitudinally of said scroll passage, wherein said second scroll passage is isolated from said wheel chamber by said partition wall so that the fluid in said second passage can flow into the turbine wheel chamber only through said opening and said side aperture, and
valve means for opening and closing said second passage.

Dependencies are inferred from the claim text.

Facts

Application: 06/564,671Filed 23 Dec 1983
Priority: JP 57-22764428 Dec 1982
Granted: 1 Oct 1985
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F01D 9/026
Nozzles; Nozzle boxes; Stator blades; Guide conduits , e.g. individual nozzles: scrolls for radial machines or engines
F01D 17/146
Varying effective cross-sectional area of nozzles or guide conduits: by throttling the volute inlet of radial machines or engines
F02B 37/025
Gas passages between engine outlet and pump drive, e.g. reservoirs: multiple scrolls or multiple gas passages guiding the gas to the pump drive
F02B 37/22
Control of the pumps: by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying…