Compressor Sound Shielding Grooves for Low-Frequency Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air conditioning devices struggle to effectively reduce low-frequency noise (400 Hz or less) generated by compressors due to amplification caused by vibrations in sound-insulation members, which are not adequately addressed by conventional sound absorption/insulation materials.
Innovation Solution
Incorporating anti-vibration grooves on the surface of sound-insulation members within the housing of air conditioning devices to minimize vibration transmission and reduce noise amplification, thereby improving noise shielding efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform thickness sound-insulation member is used, then the structure is simple and easy to manufacture, but low-frequency noise (400 Hz or less) is amplified due to vibrations transmitted throughout the member
Solution Approach 1:
The sound-insulation member is segmented by forming anti-vibration grooves that divide the uniform thickness structure into multiple sections. These grooves interrupt the vibration transmission path, preventing vibrations from propagating throughout the entire member, thereby reducing low-frequency noise amplification while maintaining manufacturing simplicity
Solution Approach 2:
The anti-vibration grooves create local variations in the sound-insulation member structure, concentrating vibration damping properties at specific locations where grooves are formed. This local modification effectively reduces low-frequency noise without requiring complete structural redesign of the entire member
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 implementation of anti-vibration grooves significantly reduces noise amplification in the low-frequency range, achieving an improved octave band average noise reduction of 3.7 dB, effectively addressing the challenge of low-frequency noise amplification.
Implementation Method 1
vibrations may occur on its surface due to vibration or sound of the compressor, which is transmitted to the entire sound-insulation member to cause vibration like a plate
Implementation Method 2
forming at least one anti-vibration groove on the surface of the sound-insulation member for improving the phenomenon of the low-frequency noise of 400 Hz or less being amplified, and even if vibrations occur on the surface of the sound-insulation member, minimizing and/or reducing transmission of the vibrations throughout the sound-insulation member
Implementation Method 3
The sound-insulation member of the housing may serve to block sound
Implementation Method 4
the sound-absorption member of the housing may serve to absorb sound
Data Source
AI summary
The present disclosure relates to a noise shielding device for implementing low noise in a heat pump outdoor unit of an air conditioning device (e.g. an air conditioner). The noise shielding device may comprise: a housing comprising a first surface exposed to the outside, open in the upward direction, and comprises a first sound insulating member comprising a sound insulating material in which a compressor is accommodated in an internal space thereof; and at least one first anti-vibration groove formed on the first surface of the first sound insulating member.