Variable-capacity radial turbine
First Claim
1. 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, andvalve means for opening and closing said second passage.
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Accused Products
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.
79 Citations
25 Claims
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1. A variable-capacity radial turbine, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification