Electric Compressor Wire Lead-in Structure for Noise Reduction
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Solution Overview
Problem
The existing electric wire lead-in part structure for shield electric wires in electric compressors fails to effectively reduce noise, compromises compactness, and hampers workability due to the need for additional grounding and space occupation.
Innovation Solution
An electric wire lead-in part structure that includes a conductor insertion hole and a conductive member for waterproof and electrical connection, with a shield grounding part that secures the shield electric wire directly to the conductor member, eliminating the need for a separate ground point and allowing for downsized components and improved fastening workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shield part is led like a single wire from around the end portion of the power supply cable and fastened to the ground point, then the shield part can be connected to the housing, but the shield part may generate noise and a satisfactory noise reduction effect cannot be expected
Solution Approach 1:
The shield part is segmented into multiple strands rather than being led as a single wire. These multiple strands are separately inserted through the conduit and fastened to the grounding terminal, which prevents noise generation while maintaining reliable electrical conduction to the housing
Solution Approach 2:
The shield part connection is transitioned from a single-point connection (single wire to single ground point) to a multi-dimensional connection where multiple strands are distributed and fastened to the grounding terminal, improving both noise reduction and electrical conduction reliability
2Reliability
If a space for fastening the shield part to the ground point is provided in addition to the space for fastening the core wire, then the shield part can be grounded, but the space around the terminal portion is occupied and compactness of the circuit substrate is impaired
Solution Approach 1:
The fastening of the shield part and the core wire to the terminal portion is merged into a single integrated structure. The grounding terminal is designed to accommodate both the shield part strands and the core wire terminal in one unified fastening location, eliminating the need for separate fastening spaces and maintaining circuit substrate compactness
Solution Approach 2:
The grounding terminal is designed with multi-functionality to serve both as the grounding point for the shield part and as the terminal for the core wire connection. This universal component performs multiple functions (grounding and electrical connection) in a single location, preserving space and compactness
3Ease of operation
If the ground point is positioned according to conventional requirements, then the shield part can be fastened, but workability upon fastening the shield part may be lowered
Solution Approach 1:
The shield part strands are preliminarily arranged and positioned before fastening to the grounding terminal. The conduit structure guides and pre-positions the multiple strands, making the subsequent fastening operation easier and more reliable without requiring precise positioning during the fastening process itself
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 solution enhances noise reduction, reduces the size of the circuit substrate, and improves workability by securely grounding the shield electric wire without additional ground points, ensuring effective electrical conduction and waterproofing.
Implementation Method 1
a conductor member made of an electrically conductive material and inserted into the conductor insertion hole in a waterproof manner and also, electrically conducted to the conductor insertion hole
Data Source
AI summary
An electric wire lead-in part structure (15) includes: a conductor insertion hole (16) formed through a wall part (2Ca) of an inverter accommodating chamber; a conductor member (17) made of an electrically conductive material and inserted into the conductor insertion hole (16) in a waterproof manner and also, electrically conducted to the conductor insertion hole (16) and holding a power supply cable (11) passed therethrough; a shield grounding part (50) for electrically conducting a shield part (45) of the power supply cable (11) to the conductor member (17) at a position where the conductor member (17) is provided; and an electric wire waterproofing part (40) for waterproofing a gap between the conductor member (17) and the power supply cable (11). The shield grounding part (50) is configured to fasten a set screw (52) abutted against a crimp ring (55) provided on the shield part (45), the set screw (52) being threadedly engaged with the conductor member (17) so as to protrude into an electric wire passing hole (23) formed in the conductor member (17), across the axial direction of the electric wire passing hole (23).