Personal Care Appliance Plug Geometry for IP-Class Moisture Protection
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Solution Overview
Problem
Personal care appliances designed for use in wet conditions face challenges with electrical connectors and power supply devices due to remnant moisture, leading to issues like electrolysis and improper IP class compatibility.
Innovation Solution
A kit featuring personal care appliances and power supply devices with customized socket and plug geometries that ensure compatibility based on IP classes, preventing insertion of plugs with lower IP classes and allowing only compatible plugs to connect, thereby reducing electrical creepage and ensuring watertightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If personal care appliances are designed for use in wet conditions with basic IP protection, then the appliance can be used in moist environments, but remnant moisture causes electrolysis of electrical contacts reducing appliance life
Solution Approach 1:
The patent applies parameter changes by implementing multiple IP protection classes (IPX4, IPX7, IPX8) with progressively higher sealing standards. Each IP class corresponds to specific geometric parameters of the socket and plug connectors, creating a parameter-based differentiation system that matches protection levels to operational environments, thereby preventing moisture-related electrolysis while extending appliance life
Solution Approach 2:
The patent implements local quality by providing different socket geometries for different IP classes within the same appliance system. Each socket geometry is specifically designed with local sealing features matched to its IP class rating, allowing the appliance to have optimized moisture protection at each connection point rather than uniform protection throughout
2Reliability
If multiple socket geometries are implemented for different IP classes, then compatibility with appropriate power supply devices is ensured, but device complexity increases
Solution Approach 1:
The patent applies asymmetry by designing distinct, non-interchangeable socket geometries for different IP classes. Each socket geometry has asymmetric sealing features, contact arrangements, and dimensional characteristics that prevent plugs from lower IP classes from being inserted, while allowing plugs from equal or higher IP classes to connect. This asymmetric design ensures compatibility control without requiring complex active identification systems
Solution Approach 2:
The patent implements segmentation by dividing the socket design into multiple geometric variants, each segmented for a specific IP class application. The segmentation approach allows the system to offer targeted protection levels for different use cases (e.g., shower-safe vs. bath-safe) while maintaining a unified electrical connection standard, thereby managing complexity through modular geometric variations rather than complete redesigns
Data Source
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AI summary
A kit comprises a personal care appliance (11, 12) and a power supply device (40). The personal care appliance (11, 12) and power supply device (40) may have mating connectors.