Personal Care Plug-Socket Geometry for Wet Connector Creepage
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Solution Overview
Problem
Personal care appliances face challenges with electrical connectors and power supply devices in wet conditions, as remnant moisture can cause electrolysis, reducing appliance life and requiring effective ingress protection to prevent electrical creep currents.
Innovation Solution
The design includes a socket and plug configuration with specific geometries that ensure appropriate fitting and watertightness, featuring curved wall segments, projections, and notches to prevent reverse polarity insertion and ensure compatibility with specific IP classes, thereby reducing electrical creepage and enhancing moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If personal care appliances are designed for use in wet conditions with standard electrical connectors, then the appliance can be used conveniently in moist environments, but remnant moisture causes electrolysis of electrical contacts reducing appliance life
Solution Approach 1:
The patent introduces a third dimension (depth) to the connector design by creating a recessed socket geometry with curved wall segments. This dimensional change increases the creepage distance between electrical contacts by extending the path along the curved surfaces, thereby preventing electrolysis while maintaining usability in wet conditions
Solution Approach 2:
The patent applies curvature to the socket wall segments, specifically using curved third and fourth circumferential wall segments that intersect the first plane. This curvature creates a longer, more complex path for electrical creepage, preventing direct moisture pathways between contacts while preserving the connector's functional geometry
2Reliability
If the socket geometry is modified to increase creepage distance with curved wall segments, then electrical creepage is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent divides the circumferential wall into distinct segments (first, second, third, and fourth circumferential wall segments) with specific geometric characteristics. This segmentation allows each segment to be optimized independently for its function while simplifying the overall manufacturing process by breaking down the complex curved geometry into manageable, standardized components
3Reliability
If the radius of curvature of the third circumferential wall segment is reduced to increase creepage distance, then moisture resistance is enhanced, but the socket depth increases
Solution Approach 1:
The patent employs asymmetric geometry where the third and fourth circumferential wall segments have different orientations and curvature characteristics relative to the first and second segments. This asymmetry allows the socket to achieve maximum creepage distance in a compact configuration by optimizing the spatial arrangement of wall segments rather than simply increasing overall depth
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 mitigates the risks of electrical creep currents and ensures compatibility with appropriate IP classes, enhancing the durability and reliability of personal care appliances in wet conditions.
Implementation Method 1
remnant moisture may cause electrolysis of electrical contacts, reducing appliance life
Data Source
AI summary
Personal care appliances, power supply devices, and kits comprising the same are disclosed. The personal care appliance and power supply device may have mating connectors.