Valve Device with Offset Axis for Hangover Reduction
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Solution Overview
Problem
Valve devices, such as swing valves, face issues with increased hangover and force required for opening/closing, leading to abnormal noise due to chattering, while butterfly valves compromise flow and sealing due to the lid's position in the flow path and low precision shapes.
Innovation Solution
A valve device with a point-symmetrical or substantially point-symmetrical planar figure opening that uses a lid portion and arm portion, where the axis intersects the flow path without the center line, allowing the lid to rotate towards the center line for closing and away for opening, reducing hangover and improving sealing and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a swing valve configuration is used with an axis parallel to the opening, then the opening can be opened/closed, but the hangover increases and the space required for opening/closing increases
Solution Approach 1:
The patent applies asymmetry by positioning the rotation axis at a location that does not pass through the center of the opening but rather at an offset position. This asymmetric axis placement allows the lid portion to rotate in a manner that reduces hangover, as the rotation path is optimized to minimize the projection toward the downstream side while maintaining effective opening/closing functionality.
Solution Approach 2:
The patent utilizes dimensional optimization by carefully selecting the axis position in three-dimensional space. The axis is positioned at specific coordinates relative to the opening plane, allowing the lid portion to rotate along an optimized trajectory that reduces the hangover volume while maintaining operational effectiveness. This spatial dimensionality change transforms the traditional centered rotation into an offset rotation that minimizes space requirements.
2Ease of operation
If a swing valve configuration is used with an axis parallel to the opening, then the opening can be opened/closed, but the force required for opening/closing increases
Solution Approach 1:
The asymmetric axis positioning creates an optimized moment arm configuration that reduces the force required for operation. By placing the axis at an offset position rather than through the center, the patent achieves a more favorable mechanical advantage, reducing the torque needed to overcome pressure differential and friction forces during opening and closing operations.
3Ease of operation
If a swing valve configuration is used, then the opening can be opened/closed, but abnormal noise increases due to chattering and collision
Solution Approach 1:
The asymmetric axis positioning creates a more favorable closing trajectory that reduces impact velocity and collision severity. The offset axis causes the lid portion to approach the closed position at a reduced angle and lower speed, minimizing the collision with the exhaust pipe that generates abnormal noise and chattering phenomena.
4Volume of moving object
If a butterfly valve configuration is used with the lid on the flow path, then hangover is reduced, but the flow of exhaust gas is hindered
Solution Approach 1:
The patent applies asymmetry by positioning the rotation axis offset from the center, which creates a rotation path that keeps the lid portion clearer of the main flow path during operation. This asymmetric configuration reduces the blockage effect on exhaust gas flow while maintaining the reduced hangover benefit, as the lid rotates along an optimized trajectory that minimizes interference with gas flow.
5Volume of moving object
If a butterfly valve configuration is used with the lid adjacent to the inner wall, then hangover is reduced, but sealing property is impaired
Solution Approach 1:
The asymmetric axis positioning optimizes the closing trajectory to ensure proper sealing contact between the lid portion and the opening. By positioning the axis at an offset location, the patent achieves a closing path that maintains adequate contact pressure and alignment for reliable sealing, while still keeping the lid portion clear of the main flow path during the open position.
Data Source
AI summary
A valve device opens/closes an opening that is located at an end portion of a flow path and whose shape is a point symmetrical or substantially point symmetrical planar figure. The valve device includes a lid portion closing the opening and an arm portion rotating the lid portion about an axis to open/close the opening. A straight line passing through the center of the opening and orthogonal to the opening is taken as a center line. The axis is a straight line intersecting the flow path without intersecting the center line. When closing the opening, the arm portion rotates the lid portion toward the center line, and when opening the opening, the arm portion rotates the lid portion to the opposite side of the center line.