Turbines, turbochargers, internal combustion engines and ships

Abstract

The purpose of the present invention is to provide a turbine that allows deterioration of performance to be suppressed when opening / closing valves are closed and the man-hours for designing an inner casing and manufacturing cost to be suppressed. Provided is a turbine that is equipped with: turbine rotor blades (4); an inner casing (21) and an outer casing (22) that form an exhaust gas flow passage; bypass sections (50) that are provided on the outer periphery of the inner casing (21) and outer casing (22) and form bypass flow passages (52) for leading the exhaust gas to an exhaust gas outlet (28a) so as to bypass the turbine rotor blades (4); and opening valves (51) for opening / closing the bypass flow passages (52).

Description

technical field [0001] The invention relates to a turbine, a turbocharger, an internal combustion engine and a ship. Background technique [0002] There is a demand for improvement in the performance of marine internal combustion engines, internal combustion engines for power generation, and the like (for example, diesel engines) when operating at low loads. In order to improve the performance at low load operation, it is preferable to increase the supercharging pressure of the supercharger mounted on the internal combustion engine. However, when the internal combustion engine is operating at a high load, the supercharging pressure becomes too high. Therefore, when the internal combustion engine runs with a high load and the exhaust gas volume increases, the so-called exhaust bypass system that suppresses the supercharged pressure from rising too much to bypass the supercharger is actually used (for example, refer to Patent Document 1 and Patent Document 2). [0003] Previ...

AI Technical Summary

Problems solved by technology

[0014] Therefore, even if the on-off valve is closed without detouring the exhaust gas, there is a problem that the exhaust gas flows out from the bypass chamber 32 and may adversely affect the performance of the turbocharger 1 .

Specifically, part of the exhaust gas in the inner casing flows into the bypass chamber 32 from the gap between the inner casing and the outer casing, and does not flow out to the outside through the turbine rotor blades, so that the flow rate of the exhaust gas used to drive the turbine rotor blades decreases. The problem

In addition, the inner housing of Patent Document 2 needs to have a special structure for forming the bypass chamber 32 , and there is a problem that the design man-hours of the inner housing are consumed and the manufacturing cost increases.

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