Scroll part structure and supercharger

Abstract

A supercharger (1) is provided with a turbine (2) and a compressor (3). The turbine (2) is provided with a scroll part (flow channel) (4) formed in a spiral shape around the rotational axis of turbine blades (21). The scroll part (4) is of such a structure that the aspect ratio of the cross-sectional shape of the flow channel at an intermediate portion (43) between an inlet part (41) and an outlet part (42) is greater than the aspect ratios of the inlet part (41) and the outlet part (42).

Description

technical field [0001] The present invention relates to a scroll structure having a helical flow path for supplying fluid to rotor blades, and a turbocharger provided with the scroll structure, and particularly to a scroll structure capable of reducing pressure loss and booster. Background technique [0002] A rotary prime mover that supplies fluid to the rotor blades and converts the kinetic energy of the fluid into rotational motion to obtain power is generally called a turbine. One of the devices utilizing this turbine is a supercharger. For example, a supercharger (turbocharger) for a vehicle includes: a turbine including a turbine blade rotating by supply of exhaust gas; and a compressor including an impeller coaxially coupled to the turbine blade through which the impeller The rotation sucks in air. [0003] The air taken in by the compressor is compressed and supplied to the engine, where it is mixed with fuel for combustion. The exhaust gas after combustion is se...

AI Technical Summary

Problems solved by technology

However, in the design of the turbocharger or turbine, it is not possible to design the scroll portion to be larger than a certain size due to the relationship with the vehicle-mounted conditions, etc.

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