Linear Compressor Shell Multilayer Noise Reduction
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Solution Overview
Problem
Linear compressors experience noise issues due to vibration and airborne noise, particularly at higher drive frequencies, which affect their quality and efficiency, and existing vibration absorbers are insufficient in reducing noise at high speeds.
Innovation Solution
The design incorporates a cylindrical shell with a multilayer plate structure and a resonator with an expansion space to reduce noise, where the multilayer plate is formed by stacking plates with recesses to minimize vibration and airborne noise transmission, and the resonator selectively reduces specific frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drive frequency of the linear compressor is increased to improve compression efficiency and reduce size, then productivity and compactness are improved, but noise level increases significantly
Solution Approach 1:
The shell is divided into multiple layers (first shell layer, second shell layer, third shell layer) with different structures and functions. Each layer serves specific noise reduction purposes while maintaining overall compression efficiency, allowing the system to operate at high frequencies without excessive noise
Solution Approach 2:
Different portions of the shell have different structures optimized for specific functions: the first shell layer has a resonance control structure for low-frequency noise, the second shell layer has a diffusion structure for mid-frequency noise, and the third shell layer has an absorption structure for high-frequency noise. This localized optimization allows effective noise reduction across the entire frequency spectrum while maintaining high drive frequency operation
2Device complexity
If a simple single-layer shell structure is used to reduce device complexity, then manufacturing is easier and cost is lower, but noise reduction capability is insufficient
Solution Approach 1:
The shell uses a composite structure with three different layers, each having distinct acoustic properties. The resonance control structure, diffusion structure, and absorption structure work together to provide comprehensive noise reduction across multiple frequency bands, achieving superior noise control that would be impossible with a single homogeneous layer
3Object-generated harmful factors
If vibration absorbers are added to reduce noise at high drive frequencies, then noise reduction is improved, but device complexity and space requirements increase
Solution Approach 1:
The noise reduction functions are merged into the shell structure itself rather than being separate components. The resonance control structure, diffusion structure, and absorption structure are all integrated into the shell layers, eliminating the need for separate vibration absorbers and reducing overall device complexity while maintaining effective noise reduction
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 both vibration and airborne noise across various frequency bands, improving the compressor's noise reduction capabilities and operational efficiency, especially at high frequencies, enhancing the quality and competitiveness of premium products.
Implementation Method 1
a resonator with an expansion space to reduce noise, where the multilayer plate is formed by stacking plates with recesses to minimize vibration and airborne noise transmission, and the resonator selectively reduces specific frequency bands
Implementation Method 2
the multilayer plate is formed by stacking plates with recesses to minimize vibration and airborne noise transmission
Data Source
AI summary
A linear compressor, a shell for a linear compressor, and a method for manufacturing a shell of a linear compressor are provided. The shell may have at least one portion having a multilayer plate, in which at least two plates may be stacked in a direction substantially perpendicular to an axis of a piston so as to accommodate a cylinder, the piston, which may be reciprocated within the cylinder, and a motor assembly directly connected to the piston to provide a drive force to the piston. At least one resonator may be disposed in or at at least a portion of an inner surface of the shell.