Spring-Biased Rotary Valve Geometry for Large Opening Control
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Solution Overview
Problem
Conventional valve devices in exhaust gas pipes face challenges in controlling the opening degree effectively due to increased biasing force from springs as the valve body inclines, leading to inefficient force reception from exhaust gas at larger opening angles, making it difficult to manage flow rates.
Innovation Solution
A valve device configuration with a rotation shaft, valve body, and biasing portion, where the valve body has an upstream wall and a rotation end that projects upstream, allowing efficient force reception from the fluid at closed positions and facilitating large rotational forces towards the open position, with the biasing portion arranged inside the pipe to reduce size and maintain control over flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is biased toward the closed position using a spring, then the valve body can be controlled to close the pipe, but as the opening degree becomes larger, the biasing force becomes greater and the valve body is less likely to receive force from the exhaust gas efficiently
Solution Approach 1:
The patent inverts the conventional design by positioning the upstream wall upstream of the rotation shaft instead of downstream. This inversion changes the mechanical advantage relationship: when the valve body is inclined at large opening angles, the upstream wall configuration allows the exhaust gas to act on a longer moment arm, generating greater rotational force toward the open position that can overcome the spring biasing force, thereby resolving the contradiction between spring control and fluid force reception.
2Force
If the valve body has an angle close to the right angle with respect to the flow direction, then the valve body can efficiently receive force from the exhaust gas, but when the valve body rotates and has a smaller inclination angle, the valve body is less likely to receive force from the exhaust gas
Solution Approach 1:
The patent utilizes the spatial dimension by positioning the upstream wall upstream of the rotation shaft, creating a different geometric relationship between the valve body, fluid flow, and rotation axis. This dimensional arrangement ensures that as the valve body rotates to larger opening angles, the upstream wall maintains an effective orientation to receive fluid force, converting the rotational movement into continued efficient force reception rather than losing effectiveness.
3Reliability
If the biasing portion is arranged outside the pipe, then the valve body can be biased toward the closed position, but the device size increases
Solution Approach 1:
The patent applies the nesting principle by placing the biasing portion (spring) inside the pipe rather than outside. The spring is positioned within the pipe's internal volume, utilizing the existing space to accommodate the biasing mechanism. This nested arrangement maintains the valve body's biasing function while avoiding additional external volume, thereby reducing the overall device size.
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
This configuration enables efficient force reception from the fluid, maintaining a large opening degree and suitable control over fluid flow rates, while reducing rotational displacement towards the open position during low flow rates and generating sufficient rotational force towards the open position.
Implementation Method 1
a biasing portion (17) biasing the valve body (19) so as to cause the valve body (19) to approach the closed position
Implementation Method 2
the valve body receives a smaller rotational force from the fluid when the valve body is in the closed position, while when the valve body is displaced from the closed position toward the open position, the valve body efficiently receives a force from the fluid
Data Source
AI summary
A valve device includes a rotation shaft, a valve body, and a biasing portion. The valve body is configured to be rotationally displaceable about the rotation shaft between a closed position and an open position. The biasing portion biases the valve body so as to cause the valve body to approach the closed position. The valve body includes an upstream wall arranged in a position upstream of the rotation shaft in a flow direction of the fluid when the valve body is in the closed position. The valve body includes a rotation end, which is an end distal from the rotation shaft and moves downstream in the flow direction of the fluid in response to a displacement of the valve body from the closed position to the open position, and the rotation end is shaped to project upstream when the valve body is in the closed position.