Scroll Compressor Balancing Mechanism for Vibration Reduction
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Solution Overview
Problem
Existing scroll compressors face challenges with vibrations and efficiency due to manufacturing tolerances and gas forces, leading to leakage and noise, with previous balancing mechanisms either requiring large installation space or causing imbalance and noise at varying speeds.
Innovation Solution
A balancing mechanism with two eccentrically positioned balancing elements, each connected to the drive shaft via separate axes of rotation, allowing for fine compensation of gas forces and manufacturing tolerances, ensuring a tight seal and reduced vibrations across a wide speed range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single balancing mass is used to compensate for gas forces and manufacturing tolerances, then the tightness of the compression space is improved, but the installation space requirement increases and vibrations occur at different speeds
Solution Approach 1:
The single balancing mass is divided into two separate balancing elements (first and second balancing elements) that can oscillate independently about separate axes of rotation. This segmentation allows each element to compensate for specific force components, reducing the total mass required while maintaining effective balancing across a wide speed range and minimizing vibrations.
2Reliability
If a single balancing mass is used to compensate for gas forces, then the sealing contact between spiral walls is improved, but noise generation increases due to vibrations at varying speeds
Solution Approach 1:
The balancing function is segmented into two independent oscillating elements with separate axes of rotation. Each element can independently adjust to compensate for gas forces at different operating speeds, providing continuous effective balancing across the speed range and reducing the vibrations that cause noise generation.
Solution Approach 2:
The balancing mechanism transitions from a static single mass to dynamic oscillating elements that can adapt their position and orientation in real-time. The first and second balancing elements oscillate about their respective axes to dynamically compensate for varying gas forces, maintaining effective sealing contact across different speeds and reducing noise.
3Area of stationary object
If the balancing mass is reduced to minimize installation space, then the installation space requirement is improved, but the balancing effect decreases and vibrations persist
Solution Approach 1:
The total balancing mass is distributed across two separate balancing elements, each contributing to the overall balancing effect. This segmentation allows for a more compact arrangement that maintains effective balancing capability across a wide speed range while minimizing the total installation space requirement.
Solution Approach 2:
The balancing mechanism utilizes two separate axes of rotation, adding a dimensional aspect to the balancing approach. This allows the balancing elements to oscillate in different planes, providing comprehensive balancing coverage with reduced individual mass requirements and minimized installation space.
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 mechanism improves the running smoothness and efficiency of scroll compressors by finely adjusting compensation for gas forces and manufacturing tolerances, ensuring a sealed compression chamber over a wide speed range, reducing vibrations and noise.
Implementation Method 1
The oscillating movement, which is automatically adjusted on the basis of the centrifugal forces, compensates for the gas forces
Implementation Method 2
The first balancing element and the second balancing element are arranged such that the center of gravity J of the first balancing element and the center of gravity K of the second balancing element are arranged on another side of the first reference line CS than the center axis P of the first axis of rotation
Data Source
AI summary
A balancing mechanism for a positive displacement machine, in particular a scroll compressor, wherein the balancing mechanism includes a drive shaft, a first balancing element and a second balancing element. The first balancing element includes a cylindrical hub section and a first force transmission section and is rotatably in contact with the drive shaft via a first axis of rotation. The second balancing element is rotatably in contact with the drive shaft via a second axis of rotation. A center axis S of the drive shaft and a center axis C of the cylindrical hub section are arranged on a first reference line CS, and a center of gravity J of the first balancing element and a center of gravity K of the second balancing element are arranged on a different side of the first reference line CS than a center axis P of the first axis of rotation.