Waterproof Three-Phase Bus Bar Connection With Tolerant Sealing
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Solution Overview
Problem
Existing three-phase line connecting devices lack effective waterproofing, leading to potential short circuits when moisture infiltrates the cover, which simply covers the three bus bars without adequate protection.
Innovation Solution
A waterproof construction for three-phase line parts, featuring a tubular exterior member that is water-tightly fixed between terminal blocks, covering the middle portion and incorporating flexible and rigid bus bar components to absorb dimensional tolerance and prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple cover is used to cover the three-phase line part, then the device complexity is reduced and ease of manufacture is improved, but waterproof protection is insufficient and reliability deteriorates
Solution Approach 1:
The protective structure is divided into multiple segments: a cover portion for general protection and a separate waterproof portion (tubular exterior member) for moisture barrier functionality. This segmentation allows each part to be optimized independently - the cover can be simple for easy manufacture, while the tubular portion provides specialized waterproof protection through its water-tight fixation to terminal blocks.
Solution Approach 2:
The tubular exterior member acts as an intermediary element between the bus bar construction bodies and the external environment. It mediates the conflict between simple covering and waterproof protection by providing a specialized waterproof barrier that connects water-tightly to terminal blocks, preventing moisture ingress while allowing the overall structure to remain manufacturable.
2Reliability
If a cover is added to protect the three-phase line part, then protection is improved, but the device complexity increases
Solution Approach 1:
The waterproof portion is merged with the cover structure to form an integrated protective assembly. The tubular exterior member is positioned to cover the middle portion of the three-phase line part and connects to terminal blocks, combining general covering functionality with specialized waterproof protection in a unified structure that doesn't significantly increase overall device complexity.
Solution Approach 2:
The cover structure serves multiple functions: it provides general physical protection for the bus bar construction bodies, acts as a mounting structure for the waterproof portion, and contributes to the overall protective enclosure. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while maintaining comprehensive protection.
3Manufacturing precision
If rigid bus bars are used, then manufacturing precision is improved, but adaptability to dimensional tolerance decreases
Solution Approach 1:
The bus bar construction bodies incorporate flexible portions that can dynamically adjust to dimensional variations and relative movements between terminal blocks. These flexible sections allow the rigid bus bar portions to maintain manufacturing precision while the flexible portions absorb dimensional tolerances and accommodate adaptability requirements through their ability to deform elastically.
Solution Approach 2:
The bus bar construction changes its physical parameters (shape, length) through the flexible portions in response to dimensional variations. The flexible bus bar sections can elongate, compress, or bend to accommodate different installation conditions and terminal block positions, allowing the rigid portions to maintain their precision while the overall construction adapts to varying dimensions.
Data Source
AI summary
A waterproof construction of a three-phase line part includes a three-phase line part having three bus bar construction bodies, a first terminal block provided on one end side of the three-phase line part, a second terminal block provided on the other end side of the three-phase line part, and a tubular exterior member that covers a middle portion of the three-phase line part. One end of the tubular exterior member is water-tightly fixed to a first housing of the first terminal block, and the other end thereof is water-tightly fixed to a second housing of the second terminal block, in a state that the tubular exterior member covers the three-phase line part.