Motor-Driven Compressor Resin Cover Metal Shield Sealing
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Solution Overview
Problem
Existing motor-driven compressors with resin covers face issues of electromagnetic noise leakage and insufficient sealing, allowing foreign matter like water and dust to enter the accommodation chamber through gaps between the conductive and insulating layers.
Innovation Solution
A motor-driven compressor design featuring a metal housing, a resin cover, and a metal shield with a sealing member between the shield and cover to block electromagnetic noise and foreign matter entry, ensuring effective sealing and preventing dust and water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a resin cover is used instead of a metal cover, then the weight of the motor-driven compressor is reduced, but electromagnetic noise from outside enters the accommodation chamber and electromagnetic noise from the motor driving circuit leaks out
Solution Approach 1:
The patent applies a composite structure consisting of a resin cover and a metal shield layer. The resin cover provides lightweight properties while the metal shield layer provides electromagnetic noise blocking. This composite material approach resolves the contradiction by combining materials with complementary properties to achieve both weight reduction and electromagnetic shielding.
2Object-affected harmful factors
If a conductive layer is added to block electromagnetic noise, then electromagnetic noise is suppressed, but the sealing between the conductive layer and insulating layer is insufficient allowing foreign matter to enter
Solution Approach 1:
The patent introduces a sealing member as an intermediary component between the metal shield layer and the resin cover. This sealing member fills the gap and prevents foreign matter from entering through the interface between the conductive and insulating layers, thereby resolving the sealing integrity issue while maintaining electromagnetic noise blocking capability.
3Stability of the object's composition
If the conductive layer is fixed to the housing with bolts, then the structure is stabilized, but gaps remain between the conductive layer and insulating layer allowing foreign matter entry
Solution Approach 1:
The patent segments the shielding structure into distinct functional layers: the metal shield layer for electromagnetic noise blocking and the sealing member for gap sealing. This segmentation allows each component to perform its specific function optimally - the metal shield provides structural stability while the sealing member ensures sealing performance by filling gaps between layers.
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 solution effectively blocks electromagnetic noise and foreign matter entry, enhancing the compressor's sealing integrity and preventing damage from dust and water, while maintaining a lightweight structure.
Implementation Method 1
a metal shield which is fixed to the cover and blocks electromagnetic noise
Implementation Method 2
A sealing member located between the shield and the cover. The sealing member is configured to block entry of foreign matter into the accommodation chamber through a gap between the shield and the cover
Data Source
Figure 1A~1B
Figure 2~3
Figure 4
AI summary
A motor-driven compressor includes a metal housing accommodating a compression unit and an electric motor and a resin cover coupled to the housing. The cover and the housing define an accommodation chamber that accommodates a motor driving circuit that drives the electric motor. A metal shield is fixed to the cover and blocks electromagnetic noise. The shield and the cover are stacked together. A sealing member located between the shield and the cover. The sealing member is configured to block entry of foreign matter into the accommodation chamber through a gap between the shield and the cover.