Personal Care Plug Geometry for IP-Class Connector Matching
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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 specific socket and plug geometries that ensure compatibility based on IP classes, preventing insertion of plugs with lower IP classes and allowing only compatible devices to connect, thus preventing moisture ingress and electrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If personal care appliances are designed for use in wet conditions with basic IP protection, then ease of operation is improved, but reliability deteriorates due to electrolysis and moisture ingress in electrical connectors
Solution Approach 1:
The patent applies local quality by implementing different IP class ratings for different components of the personal care appliance system. Specifically, the appliance housing, electrical connectors, and power supply device are assigned different IP class levels (e.g., IPX7, IPX8) based on their exposure to moisture. This localized differentiation ensures that each component has the appropriate level of protection, preventing electrolysis and moisture ingress while maintaining ease of operation in wet conditions.
2Reliability
If multiple plug geometries are introduced to match different IP classes, then reliability is improved through proper compatibility matching, but device complexity increases
Solution Approach 1:
The patent implements asymmetry by designing distinct, non-interchangeable plug geometries for different IP classes. Each plug type (e.g., first plug type for IPX7, second plug type for IPX8) has a unique shape that only fits into corresponding socket geometries. This asymmetric design prevents incompatible connections while ensuring reliable connectivity for properly matched components, with the added benefit that the asymmetric shapes can inherently indicate polarity.
Solution Approach 2:
The patent applies universality by creating a standardized system where multiple plug and socket types follow a common design language and compatibility protocol. All plugs and sockets are designed within a unified framework that allows for different IP class variations while maintaining overall system compatibility. This universal approach enables users to identify compatible components through consistent geometric patterns rather than requiring completely different connection systems for each IP class.
3Object-affected harmful factors
If socket geometry is designed to accept only higher or equal IP class plugs, then protection against moisture ingress is improved, but ease of operation deteriorates due to restricted compatibility
Solution Approach 1:
The patent applies preliminary anti-action by designing socket geometries that physically prevent insertion of plugs with insufficient IP class ratings. The socket is configured with specific geometric features (e.g., enlarged openings, specific internal contours) that only accommodate plugs with equal or higher IP protection. This preliminary prevention mechanism stops incompatible connections before they can cause moisture ingress or electrolysis, while the geometric design itself provides visual cues to guide proper insertion.
Data Source
AI summary
A kit comprises a personal care appliance and a power supply device. The personal care appliance and power supply device may have mating connectors.