Scroll Compressor Counterweight Axial Mass Distribution
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Solution Overview
Problem
Conventional scroll compressors face issues with shaft deflection due to unevenly distributed mass in counterweights, leading to vibration and noise during operation.
Innovation Solution
A scroll compressor design featuring a counterweight with a hub portion and perimeter portion, where the mass is axially distributed such that the center of mass is along a radial axis, dividing the counterweight into two regions, and the perimeter portion's mass is distributed between these regions to balance the weight, reducing the likelihood of shaft deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional counterweights with concentrated mass are used, then the counterweight structure is simple, but shaft deflection and vibration occur due to uneven mass distribution
Solution Approach 1:
The counterweight is divided into multiple discrete mass elements positioned at different radial distances from the rotation axis. This segmentation allows the mass to be distributed across multiple locations rather than concentrated at a single point, enabling the center of mass to be positioned on the rotation axis while maintaining structural simplicity.
Solution Approach 2:
Different portions of the counterweight have different mass distributions - inner mass elements are positioned closer to the rotation axis while outer mass elements are positioned farther away. This local variation in mass distribution allows the overall center of mass to be positioned on the rotation axis, eliminating shaft deflection and vibration while keeping the overall structure simple.
2Ease of manufacture
If mass is concentrated in the counterweight, then manufacturing is easier, but the center of mass shifts away from the rotation axis causing operational instability
Solution Approach 1:
The counterweight comprises multiple discrete mass elements rather than a single concentrated mass. This segmentation enables the center of mass to be positioned precisely on the rotation axis through strategic placement of individual mass elements, ensuring operational stability while maintaining ease of manufacture through modular construction.
Solution Approach 2:
The mass distribution is extended from a single-point concentration to a multi-dimensional arrangement with mass elements positioned at different radial distances and angular positions. This dimensional expansion allows the center of mass to be positioned on the rotation axis, improving operational stability while the modular nature maintains manufacturing simplicity.
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 design effectively reduces shaft deflection and associated vibrations, enhancing the operational stability and reducing noise in scroll compressors.
Implementation Method 1
A radial axis divides the counterweight into a first region on one side of the radial axis, and into a second region on the other side of the radial axis, the mass in the first region of the hub portion being roughly equal mass of the second region of the hub portion, and the mass in the perimeter portion being distributed between the first and second regions such that the center of mass of the counterweight is located along the radial axis.
Data Source
AI summary
A scroll compressor includes first and second scroll bodies having respective bases and respective scroll ribs that project from the respective bases such that the scroll ribs mutually engage. The second scroll body is movable relative to the first scroll body for compressing fluid. A drive shaft has a longitudinal axis and an eccentric drive pin configured to engage a drive hub on the second scroll body. A counterweight has a hub portion, and a perimeter portion positioned radially outward from the hub portion. A radial axis divides the counterweight into a first and second regions. The mass of the hub portion in the first region being roughly equal to the mass of the hub portion in the second region, and the mass in the perimeter portion being distributed between the first and second regions such that the center of mass of the counterweight is located along the radial axis.