Turbine for a turbocharger with movable closing and restricting member

The introduction of a movable closing and restricting member in the turbine addresses issues of turbine standstill and component complexity, enhancing catalyst heat up efficiency and mechanical robustness.

WO2025057388A1 Publication Date: 2025-03-20MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
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Patent Information

Application Number
PCT/JP2023/033639
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-11
Publication Date
2025-03-20

AI Technical Summary

Technical Problem

Existing turbocharger turbines face issues such as turbine rotor standstill due to complete blockage of the turbine outlet, which affects oil sealing and can lead to mechanical damage, along with increased weight, cost, and complexity from multiple components.

Method used

A turbine with a movable closing and restricting member that can be positioned to completely close the bypass flow path or restrict the outlet flow through the turbine outlet, ensuring a controlled amount of exhaust gas flows through the turbine impeller and bypass path.

Benefits of technology

This solution reduces the heat up time of catalysts by maximizing energy transfer to the catalyst through the bypass flow while maintaining mechanical integrity and improving oil sealing and bearing integrity.

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Abstract

The present invention relates to a turbine for a turbocharger, the turbine comprising: an impeller, adapted for being rotated by exhaust gas of an engine; a turbine inlet and a turbine outlet; a bypass flow path, for diverting exhaust gas away from the impeller; and a movable closing and restricting member, configured to be moved between two end positions, wherein, in the first end position, it is configured to completely close the bypass flow path, and wherein, in the second end position, it is configured to restrict an outlet flow through the turbine outlet, such that the outlet flow through the turbine outlet in the second end position is not completely blocked.
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