Multi-vane Impeller Cam Mechanism Friction Reduction
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Solution Overview
Problem
Traditional impeller mechanisms in machines like pumps and compressors suffer from low efficiency due to friction, leading to accelerated wear and reduced machine life, while constrained vane machines are complex and limited in speed.
Innovation Solution
A design featuring a cam with pivotably attached rings and vanes, a rotor with slots, and a housing with offset axis, allowing for controlled vane motion with reduced friction and simpler design, enabling higher speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If non-constrained vane machines are used, then the design is simpler, but friction increases leading to low efficiency and accelerated wear
Solution Approach 1:
A cam mechanism is introduced as an intermediary component between the shaft and vanes. The cam profile controls vane motion indirectly, preventing direct contact between vanes and bore while maintaining simple overall design. This mediator reduces friction loss without significantly increasing device complexity.
2Loss of energy
If constrained vane machines are used, then friction is reduced and efficiency increases, but the design becomes complicated with many moving parts limiting speed
Solution Approach 1:
Multiple functions are merged into fewer components. The cam structure simultaneously controls vane reciprocation, maintains optimal vane-bore spacing, and guides fluid flow. This consolidation reduces the number of moving parts while maintaining constrained vane benefits, enabling higher operating speeds.
Solution Approach 2:
The cam mechanism serves multiple purposes: it acts as a constraint mechanism to prevent direct vane-bore contact, a motion control device for reciprocating vanes, and a spacing maintainer for optimal efficiency. This multi-functionality reduces overall system complexity while maintaining low friction operation.
3Reliability
If constrained vane machines are used, then wear is decreased, but machine cost and reliability are adversely affected due to complexity
Solution Approach 1:
The complex multi-component constraint mechanisms from prior art are extracted and replaced with a single cam structure. This extraction maintains the wear-reduction benefit of constrained vanes while eliminating unnecessary moving parts that reduce reliability and increase cost.
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 enhances efficiency and reduces wear, allowing for higher speed operation with fewer moving parts, improving the reliability and cost-effectiveness of impeller mechanisms.
Implementation Method 1
A cam has a lobe projecting eccentric to a shaft axis... Rotation of the rotor relatively to the cam causes the vanes to rotate about the shaft axis while also reciprocating within the slots radially toward and away from the shaft axis
Implementation Method 2
each vane is pivotably mounted relative to the cam... Rotation of the rotor relatively to the cam causes the vanes to rotate about the shaft axis while also reciprocating within the slots
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
A device usable as an impeller has a plurality of vanes rotating eccentrically about a shaft. Eccentric rotation is enabled by a cam mounted on the shaft. The vanes are received within slots in a rotor which surrounds the shaft and rotates about an axis coaxial with the shaft. The rotor rotates within a housing having a cylindrical surface facing the rotor. The surface is eccentric to the shaft. The vanes execute reciprocal motion upon rotation of the rotor. The vane motion is constrained so that the edges of the vanes remain proximate to the cylindrical surface during rotation.