Motor-driven compressor
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Solution Overview
Problem
Existing motor-driven compressors face challenges in suppressing contact noise of soundproofing materials while maintaining improved soundproofing performance, particularly due to the potential contact between sound insulating layers and secondary housings, which can generate noise and compromise the intended sound insulation.
Innovation Solution
The motor-driven compressor incorporates a soundproofing material with a sound absorbing layer and a sound insulating layer, where the sound absorbing layer contacts the external surface of the first housing and the sound insulating layer is stacked on top, with specific regions forming an air layer to prevent contact between the sound insulating layer and the secondary housing, thereby absorbing and attenuating noise effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the sound insulating layer is arranged between the wall surface of the second housing and the external surface of the first housing to improve soundproofing performance, then sound insulating performance is improved, but contact noise is generated when the sound insulating layer contacts the second housing
Solution Approach 1:
The patent introduces an air layer as an intermediary between the sound insulating layer and the second housing. This air layer prevents direct contact between the sound insulating layer and the housing wall, thereby eliminating contact noise while preserving the sound insulating performance of the layered structure
Solution Approach 2:
The patent applies different properties to different regions of the soundproofing structure. The sound absorbing layer maintains direct contact with the first housing for optimal sound absorption, while the sound insulating layer is separated from the second housing by an air layer to prevent contact noise, creating locally optimized contact conditions for each layer
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 suppresses contact noise and enhances soundproofing performance by ensuring the sound insulating layer does not directly contact the secondary housing, thereby preventing noise leakage and maintaining the designed soundproofing efficiency.
Implementation Method 1
The sound absorbing layer covers the external surface of the first housing. The generated noise is absorbed by the soundproofing material.
Implementation Method 2
In the second region, an air layer is formed to prevent the sound insulating layer stacked on the sound absorbing layer from contacting the wall surface of the second housing.
Data Source
AI summary
A motor-driven compressor includes a compression unit, an electric motor, a drive circuit, a first housing, a second housing, and a soundproofing material. The second housing covers at least part of an outer surface of the first housing. The soundproofing material is arranged between the outer surface of the first housing and an area that includes an inner surface and a wall surface of the second housing. The soundproofing material has sound insulating properties. The soundproofing material includes a sound absorbing layer and a sound insulating layer. A first region and a second region are formed between the outer surface of the first housing and the area that includes the inner surface and the wall surface of the second housing. An air layer is formed in the second region.