Compressor Muffler Design to Prevent Resonance Mode Overlap Noise
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Solution Overview
Problem
Conventional compressors experience noise amplification due to overlapping resonance modes caused by similar resonance frequencies changing with oil level fluctuations, leading to increased noise levels during operation, especially at high speeds.
Innovation Solution
The compressor design includes a casing and muffler configuration where the resonance frequency of the first resonance mode differs from the second resonance mode across the entire range of oil level changes, ensuring they do not overlap, achieved by optimizing the size and shape of the casing and muffler to maintain distinct resonance frequencies f1 and f2.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the resonance frequency of the first resonance mode is set to match the resonance frequency of the second resonance mode to reduce noise, then noise reduction is improved, but resonance mode overlap occurs causing noise amplification when oil level fluctuates
Solution Approach 1:
The patent changes the resonance frequency parameter of the muffler by adjusting its volume or shape, creating a frequency offset between the first and second resonance modes. This parameter change ensures that even when oil level fluctuates and the first resonance frequency shifts, the two modes remain separated and do not overlap, preventing noise amplification while maintaining noise reduction effectiveness.
2Device complexity
If the muffler size is reduced to compact the compressor design, then device complexity is reduced, but resonance frequency control becomes difficult preventing effective noise reduction
Solution Approach 1:
The patent determines specific parameter ranges for the muffler volume or dimensions that enable frequency offset between resonance modes while maintaining a compact overall compressor design. By optimizing these parameters, the muffler achieves both space efficiency and effective noise control through resonance frequency separation.
3Adaptability or versatility
If the resonance frequency is made sensitive to oil level changes to adapt to operating conditions, then adaptability is improved, but resonance mode overlap increases causing noise amplification
Solution Approach 1:
The patent designs the muffler with specific geometric parameters that create a consistent frequency offset between the first and second resonance modes across varying oil levels. This parameter optimization allows the system to adapt to different operating conditions while maintaining resonance mode separation, preventing noise amplification despite the sensitivity to oil level changes.
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 configuration effectively reduces noise by preventing resonance mode overlap, maintaining low noise levels even under conditions of oil level fluctuation and high-speed operation, enhancing operational stability and noise reduction.
Implementation Method 1
A size of the casing or the muffler is set so that in an entire range of a first resonance mode in which a resonance frequency changes as an oil level of lubricant oil stored in the casing changes, the resonance frequency of the first resonance mode is different from a resonance frequency of a second resonance mode
Data Source
AI summary
A compressor includes a casing having a cylindrical shape and end plates at both ends, a compression mechanism housed in the casing, and a muffler disposed between a fluid outlet of the compression mechanism and a space in the casing. A size of the casing or the muffler is set so that in an entire range of a first resonance mode in which a resonance frequency changes as an oil level of lubricant oil stored in the casing changes, the resonance frequency of the first resonance mode is different from a resonance frequency of a second resonance mode in which the resonance frequency does not change as the oil level of the lubricant oil changes.