Power Converter Gasket Guide Geometry to Prevent Seal Turnover
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Solution Overview
Problem
In power conversion devices, the gasket can inadvertently turn over during assembly due to misalignment of the holder and housing, compromising the waterproof seal.
Innovation Solution
The power conversion device incorporates a casing with inner and outer guide surfaces and a gasket positioned between the insertion portion and the opening, where the distance between the gasket and the insertion component's guide surface is set larger than the distance between the casing's guide surface and the front surface, preventing the gasket from turning over during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the holder is inserted into the opening under a misaligned state, then the assembly process can proceed, but the gasket may interfere with the housing to be undesirably turned over
Solution Approach 1:
The guide surfaces are provided in advance on both the holder and housing to establish proper alignment before the gasket is compressed into its sealing position. This preliminary alignment action prevents misalignment during insertion that would cause the gasket to turn over
Solution Approach 2:
The guide surfaces act as an intermediary mechanism between the holder and housing, mediating the insertion process to ensure proper alignment. These surfaces guide the relative movement and positioning, preventing direct contact between the gasket and housing that would cause overturning
2Length of moving object
If the gasket is positioned closer to the front surface to reduce height, then the device size is minimized, but the gasket may turn over during assembly
Solution Approach 1:
The guide surfaces establish proper alignment before the gasket is compressed, allowing the gasket to be positioned closer to the front surface without risk of overturning. The preliminary guidance ensures the gasket remains stable even at reduced distance from the front surface
Solution Approach 2:
The distance parameters L1 and L2 are specifically designed with L2 > L1, creating an optimal geometric relationship that prevents gasket overturning while minimizing device height. This parameter optimization allows the gasket to be positioned closer to the front surface without compromising stability
Data Source
AI summary
Provided is a power conversion device, including: a casing that has a front surface with an opening; an insertion component including an insertion portion; and a gasket. The casing has an inner wall surface being in contact with the gasket and a casing-side guide surface. The insertion portion has an outer peripheral surface being in contact with the gasket and an insertion component-side guide surface. When a distance in the insertion direction between the front surface and an end of the casing-side guide surface, which is closer to the front surface in the insertion direction, is represented by L1 and a distance between an inner surface of the gasket in the insertion direction and a distal end of the insertion component-side guide surface in the insertion direction is represented by L2, the distance L2 is set larger than the distance L1.