Linear Compressor Muffler Coupling for Gap-Free Noise Filtering
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Solution Overview
Problem
Linear compressors face challenges in efficiently coupling muffler units to back covers, leading to potential gaps and reduced noise reduction effectiveness due to limited space and the need for separate welding processes.
Innovation Solution
A linear compressor design that couples a metal back cover with a non-metal muffler unit using a coupling portion that corresponds to the opening, allowing press-fitting without welding, and incorporates an elastic member to guide position and enhance stability, thereby improving coupling stability and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a separate welding process is used to couple the muffler unit to the back cover, then the coupling strength is improved, but the device complexity and manufacturing time increase
Solution Approach 1:
The patent integrates the coupling function directly into the muffler unit structure by forming a coupling protrusion that fits into a coupling hole in the back cover. This merging of the coupling mechanism with the muffler unit eliminates the need for separate welding processes, reducing manufacturing complexity while maintaining coupling strength through precise mechanical interfitting.
Solution Approach 2:
The coupling protrusion and coupling hole act as intermediary mechanical features that mediate the connection between the muffler unit and back cover. Instead of directly welding the two components, the patent introduces these intermediary coupling structures that facilitate a stable, gap-free connection while simplifying the overall manufacturing process.
2Volume of moving object
If limited space is available for coupling the muffler unit, then the compactness is improved, but the coupling stability and noise reduction effectiveness deteriorate
Solution Approach 1:
The coupling protrusion of the muffler unit is designed to nest precisely into the coupling hole of the back cover, creating a nested connection that maximizes coupling stability within the limited available space. This nested arrangement ensures firm coupling without requiring additional external space, thereby maintaining both compactness and reliability.
Solution Approach 2:
The patent applies local quality by concentrating the coupling functionality at the specific interface between the muffler unit and back cover. The coupling protrusion and hole are strategically positioned and dimensioned to provide localized structural reinforcement and stable connection exactly where needed, ensuring reliable coupling within the constrained spatial envelope of the compressor.
3Ease of manufacture
If gaps are present between the muffler unit and back cover, then the ease of assembly is improved, but the noise reduction effectiveness deteriorates
Solution Approach 1:
The patent converts the potential harm of gaps (which would allow noise leakage) into a benefit by designing an interference-fit coupling system. The coupling protrusion is dimensioned to create tight, gap-free contact with the coupling hole, transforming what could be a loose, noisy connection into a firm, noise-blocking joint that eliminates harmful sound transmission paths.
Solution Approach 2:
The coupling interface combines metallic materials with precise geometric features (protrusion and hole) to create a composite structural connection. This composite approach integrates the structural support function with the noise isolation function, ensuring that the metallic coupling structures eliminate gaps that would otherwise transmit noise while maintaining ease of assembly through the standardized coupling geometry.
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 design achieves firm coupling between the back cover and muffler unit, reduces gaps, and enhances noise reduction efficiency by improving the muffler's noise filtering characteristics and space utilization.
Implementation Method 1
an elastic member to guide a position of the second intake muffler with respect to the muffler body
Data Source
AI summary
A linear compressor includes a cylinder, a piston axially reciprocating in the cylinder, a first muffler unit coupled to the piston, a back cover that is disposed at a rear of the piston and defines an opening at a radially central area, and a second muffler unit coupled to the opening. The first muffler unit includes an inner guide disposed in the piston and a first intake muffler disposed at a rear of the inner guide. The second muffler unit includes a second intake muffler that is in fluid communication with the first intake muffler and is coupled to the opening, and a muffler body surrounding the second intake muffler. The second intake muffler includes a coupling portion that is disposed at a rear of the second intake muffler and has a shape corresponding to the opening.