Scroll Compressor Muffler Resonator for Noise Reduction
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Solution Overview
Problem
Scroll compressors experience significant noise and vibration issues due to the interaction of refrigerant with the muffler, leading to reliability concerns and pressure pulsation when a discharge valve is not used, which amplifies noise and resonance.
Innovation Solution
Incorporating a resonator within the muffler that forms a separate cavity with resonant holes to counterbalance or absorb noise and vibration, utilizing a resonant cover and partition ribs to control frequency and attenuate noise and vibration across multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a discharge valve is not used to simplify the structure, then device complexity is reduced, but noise and vibration increase due to pressure pulsation
Solution Approach 1:
The patent applies the Helmholtz resonator principle to convert the harmful pressure pulsation and noise into a beneficial effect. The resonator is designed with specific dimensions (cavity volume V0, neck area S0, neck length L0) to create a resonant frequency that matches the dominant noise frequency from the compressor. This resonance creates a counter-phase pressure wave that actively cancels the harmful pressure pulsation, transforming the noise problem into a noise cancellation solution without requiring a discharge valve.
Solution Approach 2:
The patent optimizes specific parameters of the resonator to control noise and vibration. By adjusting the cavity volume V0, neck area S0, and neck length L0, the resonant frequency of the Helmholtz resonator is tuned to match the dominant frequency of the compressor noise. This parameter optimization allows the system to effectively cancel noise at specific frequencies while maintaining simplified structure without a discharge valve.
2Reliability
If the compression unit is positioned closer to the discharge outlet to improve oil supply, then lubrication performance improves, but the lower frame structure becomes more complex
Solution Approach 1:
The patent merges the resonator structure with the existing lower frame structure of the compressor. Instead of adding a separate noise control component, the Helmholtz resonator is integrated into the lower frame, utilizing the available space and structural elements. This integration achieves both noise cancellation and maintains the simplified single-frame structure, eliminating the need for additional lower frame components while preserving reliable lubrication.
3Reliability
If the orbiting scroll is tilted to match gas power and repulsive force, then reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces the mechanical solution of tilting the orbiting scroll to balance forces with a acoustic field-based solution. Instead of mechanically adjusting scroll alignment to match gas power and repulsive force action points, the Helmholtz resonator uses acoustic pressure waves to counterbalance the harmful force pulsations. This substitution eliminates the need for precise mechanical alignment while maintaining force balance and reliability.
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 resonator effectively reduces noise and vibration within the muffler, improving compressor reliability and durability by matching and dissipating resonant frequencies, even in the absence of a discharge valve, and addressing multiple frequency bands.
Implementation Method 1
a resonator provided in the muffler, forming a cavity separate from the sealed space to reduce vibration and noise caused by the refrigerant
Implementation Method 2
Incorporating a resonator within the muffler that forms a separate cavity with resonant holes to counterbalance or absorb noise and vibration
Data Source
AI summary
The present invention relates to a compressor comprising: a muffler that provides a sealed space for guiding a refrigerant; and a resonator provided in the muffler and forming cavities separate from the sealed space to decrease vibration and noise caused by the refrigerant.