Intake Device Flow Regulating Structure for Noise Reduction
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Solution Overview
Problem
Conventional intake devices experience intake noise due to pressure fluctuations when the throttle valve opens, as air flows from the upper and lower ends of the butterfly valve mix within the round tube, causing turbulence and noise.
Innovation Solution
The intake device incorporates a flow regulating structure with a round tube body of smaller diameter, positioned radially outside the valve when fully open, guiding airflow from the lower end of the valve downstream through the intake passage, preventing mixing with airflow from the upper end, thus reducing pressure fluctuations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a round tube is provided in the center area of the intake passage downstream of the throttle valve, then intake noise is reduced by regulating airflow, but airflow from upper and lower ends of the valve mixes within the round tube causing turbulence and noise
Solution Approach 1:
The round tube is divided into an upstream portion and a downstream portion separated by a partition wall. The upstream portion receives airflow from the upper end of the throttle valve, while the downstream portion receives airflow from the lower end. This segmentation prevents mixing of the two airflow streams, eliminating turbulence and noise while maintaining the noise reduction benefits of the round tube structure.
Solution Approach 2:
A communication hole is provided in the partition wall to allow controlled communication between the upstream and downstream portions. This intermediary structure enables pressure equalization and coordinated airflow regulation between the two portions without causing turbulent mixing, serving as a mediator that maintains flow separation while allowing necessary interaction.
2Productivity
If the round tube is located in the center area on the axis line of the intake passage, then flow regulation is achieved, but airflow from upper and lower ends hits against each other causing intake noise
Solution Approach 1:
The round tube is segmented into upstream and downstream portions by a partition wall, with each portion handling airflow from different ends of the throttle valve. This segmentation allows flow regulation to be maintained while preventing the harmful interaction of airflows that causes noise when the valve opens.
3Ease of operation
If the valve opens from fully closed state, then air supply control is achieved, but pressure fluctuation occurs causing intake noise
Solution Approach 1:
The segmented round tube structure with partition wall allows each portion to independently manage pressure changes from airflow opening, preventing sudden pressure fluctuations that would cause noise while maintaining effective air supply control.
Solution Approach 2:
The communication hole in the partition wall acts as an intermediary that allows gradual pressure equalization between upstream and downstream portions during valve opening, smoothing out pressure fluctuations and reducing noise while maintaining air supply control capability.
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 separates airflow from the upper and lower ends of the valve, preventing pressure fluctuations and significantly reducing intake noise by guiding airflow through the intake passage without mixing, enhancing the flow regulation and reducing noise.
Implementation Method 1
the flow regulating structure is configured and arranged in a manner that, when the valve is fully open, the flow regulating structure resides in a position that is radially outside of, and out of contact with, the another end of the valve
Data Source
AI summary
An intake device is provided with a throttle body having a valve that can rotate relative to a body, and an intake pipe provided downstream of the throttle body and connected to an internal combustion engine, an intake passage of the intake pipe being provided with a flow adjustment part that guides the air supplied from the throttle body in the direction in which the intake passage extends, and the flow adjustment part being provided to an upstream end that is on the throttle body-side in the intake passage and also being provided so as to connect to an inner peripheral surface of the intake passage at a position of non-contact when the valve is fully open.