Compressor Unit Dimensional Optimization to Reduce Vibration and Noise
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Solution Overview
Problem
High-speed rotation of compressor units leads to increased vibrations and noise due to the propagation of axial vibrations from the compressor body to the accumulator, which worsens with higher numbers of revolutions, causing excessive noise in refrigeration apparatuses.
Innovation Solution
Optimizing the dimensional relationship among compressor unit components by reducing the weight of the piston and blade, lowering the center of gravity, and increasing the moment of inertia, while ensuring sufficient lubricant accumulation to minimize vibrations, as indicated by the parameter F×(h/I)×L ≤ 19×P+128, where F represents the weight multiplied by the square of the number of revolutions, h is the distance to the center of gravity, I is the moment of inertia, and P is the rated capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of revolutions of the compressor body is increased to improve compression performance, then productivity increases, but vibrations and noise increase due to propagation to the accumulator
Solution Approach 1:
The patent applies vibration isolation techniques by strategically positioning the accumulator's inlet pipe connecting portion near the compressor body's center of support. This positioning reduces the propagation of axial vibrations from the compressor body to the inlet pipe during high-speed operation, thereby suppressing the transmission of harmful vibrations and noise to the accumulator while maintaining high compression performance
Solution Approach 2:
The inlet pipe connecting portion acts as an intermediary element that is strategically positioned to mediate between the compressor body and the accumulator. By locating this connecting portion near the center of support, it serves as a vibration isolation interface that reduces the direct transmission path for axial vibrations, allowing high-speed compression operation without excessive noise propagation
2Use of energy by moving object
If the weight of the piston and blade is reduced to improve efficiency, then energy consumption decreases, but vibrations increase due to lower moment of inertia
Solution Approach 1:
The patent optimizes the dimensional parameters of the piston and blade to achieve a balance between weight reduction and vibration control. By carefully selecting the dimensions and mass distribution of these moving components, the design reduces energy consumption through lower mass while maintaining sufficient moment of inertia to suppress excessive vibrations during high-speed rotation
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 solution effectively reduces rotational vibrations and noise levels, allowing for higher compressor body revolutions without increasing accumulator vibrations, thereby improving compressor performance and reducing noise in refrigeration systems.
Implementation Method 1
a piston configured to rotate eccentrically in the cylinder
Implementation Method 2
a compression mechanism including a cylinder, a piston configured to rotate eccentrically in the cylinder
Implementation Method 3
a blade partitioning an interior of a compression chamber of the cylinder into a low-pressure chamber and a high-pressure chamber
Implementation Method 4
reducing the propagation, to the inlet pipe, of vibrations in the direction of inclination of the compressor body and vibrations in the axial direction of the compressor body during operation of the compressor body
Data Source
AI summary
A compressor unit includes a compressor body with a compression mechanism, and an accumulator. The compression mechanism includes a cylinder, a piston, and a blade. F×(h/I)×L≤19×P+128. F represents a value obtained by multiplying a weight of the piston and the blade by a square of the number of revolutions of the compressor body, and h represents a distance from a center of the piston in a thickness direction to a center of gravity of the compressor unit. I represents a moment of inertia around a center axis of the compressor unit passing through the center of gravity of the compressor unit. L represents a distance from an axis of an inlet pipe of the accumulator to the center of gravity of the compressor unit, and P represents a refrigeration apparatus rated capacity.