Exhaust Valve Bias Spring Nesting for Compact Flow Path Control
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Solution Overview
Problem
Existing valve devices for exhaust gas flow paths require significant space due to external components like link arms and springs, limiting their compactness and efficiency.
Innovation Solution
A valve device configuration with a biasing member inside the flow path, utilizing a rotatable valve body and tension coil springs to adjust the opening degree, allowing the valve body to tilt and rotate based on fluid dynamic pressure, reducing the need for external space and enhancing design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the biasing member is disposed outside the exhaust pipe, then the valve mechanism can be simpler to manufacture, but the space for arranging the valve device becomes larger
Solution Approach 1:
The biasing member is disposed inside the exhaust pipe, nesting the biasing mechanism within the existing flow path structure. This eliminates the need for external space while maintaining the valve's operational functionality, directly resolving the contradiction between compact arrangement and manufacturing simplicity
2Stability of the object's composition
If the valve body is positioned perpendicular to the flow direction, then the flow path is more uniform, but the dynamic pressure distribution becomes less effective for rotating the valve body
Solution Approach 1:
The valve body is tilted at an angle of 5 to 45 degrees relative to the cross-section perpendicular to the flow direction. This asymmetric positioning creates unequal dynamic pressure distribution between the first and second portions of the valve body, generating the necessary torque to rotate the valve body in the opening direction while maintaining adequate flow path uniformity
3Adaptability or versatility
If the central axis of the valve body does not pass through the center of the flow path, then the area ratio between two areas can be optimized, but the flow path uniformity deteriorates
Solution Approach 1:
The tilt angle of the valve body is optimized within the range of 5 to 45 degrees, and the central axis position is adjusted to pass through or near the center of the flow path. These parameter optimizations balance the area ratio between the two portions with adequate flow path uniformity, allowing effective torque generation while maintaining acceptable flow characteristics
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 reduces the space required for the valve device, enables more flexible design, and ensures smoother exhaust gas flow by concentrating dynamic pressure on specific areas, allowing the valve body to open effectively without considering area ratios, thus improving the overall flow path uniformity and efficiency.
Implementation Method 1
a biasing member provided to the axial member inside the flow path and configured to bias the valve body to rotate in the closing direction
Implementation Method 2
the exhaust gas having reached the valve body flows toward the first portion along the valve body, and the exhaust gas flow concentrates on the first portion. Consequently, a dynamic pressure of the exhaust gas at the first portion exceeds the dynamic pressure of the exhaust gas at the second portion
Data Source
AI summary
A valve device is configured to adjust an opening degree of a flow path for fluid, and includes an axial member, a valve body, and a biasing member. The axial member is configured to be fixed to the flow path. The valve body is rotatable about the axial member, and is configured to be rotated in a closing direction in which the opening degree is reduced, and to be rotated, by the use of a fluid flowing down through the flow path, in an opening direction in which the opening degree is increased. The biasing member is provided to the axial member inside the flow path, and is configured to bias the valve body to rotate in the closing direction.