Vacuum Pump Vane Wear Reduction via Curvature Matching
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Solution Overview
Problem
High-speed operation of single-vane vacuum pumps leads to excessive wear of vane end portions and chamber walls due to high contact pressure and interference issues, resulting in damage and undulations.
Innovation Solution
The vane end portions are designed with bend radii matching the chamber wall, providing larger contact surfaces at stress points to reduce wear, allowing for higher rotation speeds and minimizing play between the vane and chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vane end portions have a semicircumferential shape with limited contact surfaces, then the vane can rotate freely in the chamber, but high contact pressure occurs leading to excessive wear at high rotation speeds
Solution Approach 1:
The end portions of the vane are designed with different geometries at different locations: the first end portion has a semicircumferential shape for free rotation, while the second end portion has a bent shape with a bend radius matching the chamber wall curvature. This local differentiation allows the second end portion to engage with the chamber wall at multiple contact points, distributing contact pressure and reducing wear during high-speed operation.
Solution Approach 2:
The second end portion of the vane is designed with a bent shape where the bend radius substantially matches the curvature of the chamber wall. This curvature matching creates multiple contact points between the vane end portion and chamber wall, transforming the contact from a single point to a distributed line or surface contact, thereby reducing contact pressure and wear during high-speed rotation.
2Stability of the object's composition
If the vane length is reduced to avoid interference with the chamber wall, then the vane can rotate without interference, but play between the vane and chamber wall increases causing damage and undulations
Solution Approach 1:
The vane is designed with non-uniform end portions: the first end portion maintains a semicircumferential shape for smooth rotation, while the second end portion features a bent configuration with specific bend radius. This local geometric variation allows the vane to achieve both stable rotation and reduced play by creating controlled contact zones that prevent harmful movements without causing damage.
3Reliability
If the vane end portions are designed with larger contact surfaces, then wear is reduced, but the vane may interfere with the chamber wall during rotation
Solution Approach 1:
The vane end portions are designed with differentiated geometries: the first end portion has a semicircumferential shape that allows free rotation with minimal contact, while the second end portion has a bent shape with match-radius curvature that creates multiple contact points for wear reduction. This local differentiation enables the vane to achieve both rotation freedom and wear resistance simultaneously.
Solution Approach 2:
The second end portion is designed with a bent shape where the bend radius substantially matches the chamber wall curvature. This curvature matching creates multiple contact points that distribute contact pressure and reduce wear, while the overall vane geometry maintains sufficient clearance for free rotation during operation.
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
Significantly reduces wear on vane end portions and chamber walls, enabling higher rotor speeds and minimizing damage, while also reducing manufacturing costs by optimizing end portion shaping.
Implementation Method 1
the end portions of the vane, acting as sliding blocks of the vane along the wall of the stator chamber, are subject to wear
Implementation Method 2
the end portions of the vane... are subject to wear, which is as higher as the rotation speed of the rotor is higher
Implementation Method 3
in certain operating configurations where the force of inertia of the vane substantially counterbalances the centrifugal force of the vane
Implementation Method 4
in certain operating configurations where the force of inertia of the vane substantially counterbalances the centrifugal force of the vane
Data Source
AI summary
A vacuum pump for a motor vehicle engine which has a stator and a chamber, has a side wall, and the side wall has a transversal section with a predetermined shape. The rotor mounted in the chamber is capable of rotating around a rotation axis parallel to the side wall. The vane mounted on the rotor is free to slide in a direction at right angles with respect to the rotation axis of the rotor, and the vane has a predetermined length and two opposite end portions that substantially slide along the side wall of the chamber. At least one of the end portions of the vane has at least one part that has a bend radius substantially equal to that of a part of the side wall, when the one vane is at a reference operating position.