Hybrid flow variable spiral case

Abstract

Disclosed is a mixed variable flow volute, comprising a turbine volute (1) within which are provided a volute intake flow path and a volute nozzle ring (13). One end of the volute intake flow path is provided with a volute air-inlet (2), and the other end thereof is provided with a volute air-outlet (3); the volute intake flow path is divided into three flow paths via partitions, i.e. a first intake flow path (4), a second intake flow path (5) and a third intake flow path (6), each of which is in communication with the volute air-inlet (2); the first intake flow path (4) is a normally open intake flow path; and intake control valves (7) are provided in the second intake flow path (5) and the third intake flow path (6) close to the volute air-inlet (2), the intake control valves (7) being able to be opened or closed depending on the operating speed of the engine so as to open or close at least one of the second intake flow path (5) and the third intake flow path (6). The mixed variable flow volute has a simple structure, low cost, high reliability and is easy to control.

Description

technical field [0001] The invention relates to a variable flow volume volute, specifically, through an air intake regulating device, different flow channels can work independently or jointly to meet the performance requirements of various working conditions of the engine, and can improve the performance of the engine at medium speed working conditions. A hybrid variable flow volute belongs to the field of internal combustion engines. Background technique [0002] With the increasingly stringent requirements of emission regulations, people are increasingly demanding a turbocharger that can take into account the performance of the engine under all operating conditions. Because the variable geometry turbocharger (VGT) can effectively control the exhaust pressure of the engine, it can It has become the focus of research and development to achieve a good performance match between the turbocharger and the engine under various working conditions. A variety of variable cross-secti...

AI Technical Summary

Problems solved by technology

However, the problem in practical application is that the negative pressure difference between the intake and exhaust of the engine is very high, and the pumping loss is too high, resulting in high fuel consumption under low-speed engine conditions.

However, under the medium and high-speed working conditions of the engine, the mixed flow of the air flow in the inlet flow channel of the outer flow channel of the volute is prone to occur, and the air flow backflows to the outer flow channel of the volute at the point where the air intake area of ​​the inner flow channel of the volute has the largest angle, which affects the Improved engine performance under medium and high operating conditions

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