Refrigerating Compressor Suction Muffler Resonance Noise Control
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Solution Overview
Problem
Conventional refrigerating compressors fail to effectively deaden low-frequency noises generated during the refrigerant gas suction process, which are a concern for improved sound quality in refrigeration systems.
Innovation Solution
The refrigerating compressor incorporates a suction muffler with a resonating chamber that has a resonance frequency matching the specific resonance frequency of the hermetic container, featuring a side-branch type resonator with a monolithically molded resonating chamber and tail tube, ensuring consistent sound deadening performance without refrigerant gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional suction muffler with a resonating chamber is used, then sound deadening at specific frequencies is achieved, but low-frequency noises (approx. 400 Hz-600 Hz) generated during refrigerant gas suction are not effectively deadened
Solution Approach 1:
The suction muffler is divided into multiple functional chambers: a resonating chamber for targeting specific noise frequencies and a diffusion chamber for addressing low-frequency noises through scattered flow paths. This segmentation allows each chamber to specialize in different frequency ranges, collectively providing broader sound deadening effectiveness.
Solution Approach 2:
A diffusion chamber is introduced as an intermediary component between the resonating chamber and the tail tube. This diffusion chamber serves as a mediator that handles low-frequency noises through its scattered flow path structure, while the resonating chamber continues to address higher-frequency sounds, thereby extending the overall frequency coverage of the muffler.
2Reliability
If the resonating chamber and tail tube are separately manufactured and assembled, then manufacturing flexibility is maintained, but refrigerant gas leakage may occur at the connection interface
Solution Approach 1:
The resonating chamber and tail tube are merged into a single monolithically molded component. This integration eliminates the connection interface between these two parts, thereby completely preventing refrigerant gas leakage at the joint. The unified structure maintains reliable sealing while simplifying the manufacturing process through single-piece molding.
Solution Approach 2:
The monolithically molded resonating chamber-tail tube assembly serves multiple functions simultaneously: it acts as a structural support element, a flow conduit, and a sound deadening component. This multi-functionality reduces the number of separate parts needed, simplifying both manufacturing and assembly while ensuring reliable sealing.
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 design significantly reduces noise levels at specific frequencies, maintaining effective sound deadening characteristics throughout the compressor's operation, enhancing the acoustic performance of refrigeration systems.
Implementation Method 1
a resonating chamber formed attached to the tail tube and having a resonance frequency substantially agreeing with a specific resonance frequency of the container
Data Source
AI summary
A refrigerating compressor includes a compressing element and a hermetic container accommodating the compressing element, which includes a compressing chamber where refrigerant gas is compressed, and a suction muffler (118) having a sound deadening space (119) and communicating with the compressing chamber. The suction muffler (118) includes a tail tube (121) having a first end open into the hermetic container and a second end open into the sound deadening space (119), and a resonating chamber (122) formed attached to the tail tube (121) and having a resonance frequency substantially agreeing with a specific resonance frequency of the hermetic container. This structure allows the resonating chamber (122) to deaden the noises coming from vibration sounds of a suction valve or ripple sounds of refrigerant gas.