Variable Nozzle Turbocharger Asymmetric Link Chamber Passage
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Solution Overview
Problem
Forced-induction devices face challenges in reducing deposit accumulation in the link chamber while maintaining efficiency, as increasing the passage area for deposit discharge reduces forced induction efficiency, and reducing the passage area leads to increased deposit accumulation.
Innovation Solution
A forced-induction device with a communication passage having a larger first opening than second opening, where the first opening faces the scroll chamber and the second opening faces the link chamber, allowing easy discharge of deposits and minimizing exhaust gas flow into the link chamber, thus reducing deposit accumulation and maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the passage area of the communication passage is increased to improve deposit discharging performance, then the deposit discharge capability is improved, but the amount of exhaust gas flowing from the scroll chamber to the link chamber increases, reducing forced induction efficiency
Solution Approach 1:
The communication passage has different passage areas at different locations: a larger first passage area at the scroll chamber end (first opening) and a smaller second passage area at the link chamber end (second opening). This local variation in passage area allows the passage to simultaneously facilitate deposit discharge while limiting exhaust gas flow into the link chamber.
Solution Approach 2:
The communication passage is segmented into two distinct sections with different cross-sectional areas. The first section (with larger area) handles deposit discharge from the link chamber, while the second section (with smaller area) controls the flow of exhaust gas into the link chamber, preventing excessive gas flow that would reduce forced induction efficiency.
2Loss of energy
If the passage area of the communication passage is reduced to maintain forced induction efficiency, then the forced induction efficiency is maintained, but the deposit discharging performance deteriorates
Solution Approach 1:
The communication passage has different passage areas at different locations: a larger first passage area at the scroll chamber end (first opening) and a smaller second passage area at the link chamber end (second opening). This local variation in passage area allows the passage to simultaneously facilitate deposit discharge while limiting exhaust gas flow into the link chamber.
Solution Approach 2:
The communication passage is segmented into two distinct sections with different cross-sectional areas. The first section (with larger area) handles deposit discharge from the link chamber, while the second section (with smaller area) controls the flow of exhaust gas into the link chamber, preventing excessive gas flow that would reduce forced induction efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces deposit accumulation in the link chamber and minimizes the reduction in forced induction efficiency by ensuring easy discharge of deposits through the communication passage, while preventing excessive exhaust gas flow, thereby maintaining performance.
Implementation Method 1
Depending on the operating state of the internal combustion engine, the pressure difference between the scroll chamber 910 and the link chamber 920 is expected to increase in the forced-induction device 900. When the pressure difference between the scroll chamber 910 and the link chamber 920 is great, exhaust gas flows from the scroll chamber 910 to the link chamber 920.
Implementation Method 2
The deposit accumulated in the link chamber receives various forces. Various forces include the force based on operation of the link mechanism, the pressure of exhaust gas flowing through the link chamber, and the force based on vibration of the forced-induction device. When receiving forces, the deposit may fall off the part where it is adhered.
Implementation Method 3
The deposit accumulated in the link chamber receives various forces. Various forces include the force based on operation of the link mechanism, the pressure of exhaust gas flowing through the link chamber, and the force based on vibration of the forced-induction device.
Implementation Method 4
The deposit accumulated in the link chamber receives various forces. Various forces include the force based on operation of the link mechanism, the pressure of exhaust gas flowing through the link chamber, and the force based on vibration of the forced-induction device. When receiving forces, the deposit may fall off the part where it is adhered.
Data Source
AI summary
A forced-induction device includes nozzle vanes, a link mechanism coupled to the nozzle vanes, a housing, and a communication passage. The housing has a scroll chamber, in which the nozzle vanes are located, and a link chamber, in which the link mechanism is located. The communication passage connects the scroll chamber and the link chamber to each other. The scroll chamber has a passage area that reduces from the upstream side to the downstream side in the flowing direction of exhaust gas in the scroll chamber. The communication passage has a first opening, which faces the scroll chamber, and a second opening, which faces the link chamber. The first opening has a larger passage area than the second opening.