Compressor Roller Torque Load Reduction via Asymmetric Geometry
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Solution Overview
Problem
Conventional rotary compressors with oval-shaped rollers experience increased torque load due to the movement of the gas force weight center, leading to reduced compression efficiency.
Innovation Solution
The implementation of a torque load reducing unit positioned on the long-axis direction central line of the roller, which can be symmetrical or asymmetrical, and formed with specific geometrical dimensions to move the gas force weight center closer to the rotation center, thereby reducing the distance between the two and minimizing torque load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the roller shape is changed from circular to oval, then vibration noise is reduced and repulsive force in radial direction disappears, but the distance between rotation center and gas force weight center increases, causing torque load to increase
Solution Approach 1:
The roller is designed with an asymmetric cross-sectional shape (oval or elliptical) instead of a symmetric circular shape. This asymmetry causes the gas force weight center to shift toward the rotation center, reducing the torque load while maintaining the vibration reduction benefits of the oval shape.
Solution Approach 2:
The cross-sectional shape parameters of the roller are specifically optimized by adjusting the ratio between the long axis and short axis dimensions. This parameter change allows the gas force weight center to be positioned closer to the rotation center, thereby reducing torque load while preserving the vibration damping characteristics.
2Productivity
If the roller is made oval-shaped, then compression efficiency is improved through reduced repulsive force, but the weight center distance increases leading to higher torque load
Solution Approach 1:
The asymmetric oval cross-section is designed to simultaneously achieve two goals: reducing repulsive force during compression (improving efficiency) and positioning the gas force weight center closer to the rotation center (reducing torque load).
Solution Approach 2:
Specific dimensional parameters of the oval cross-section are optimized, particularly the ratio between long and short axes, to balance compression efficiency with torque load reduction.
Data Source
AI summary
A compressor having a torque load reducing unit to move a center of weight to which a gas force is applied is provided. As the torque load reducing unit is formed at an oval-shaped roller, a distance between a rotation center of the roller and an operation point to which a gas force is applied is shortened. This may reduce a torque load to the roller, and may enhance a compression efficiency.