Switch Protection Device Bi-Metallic Plate Deformation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional safety switch devices with bi-metallic plates are prone to inaccurate deformation due to complex assembly and high part count, leading to incomplete disconnection and potential reconnection of circuits, increasing costs and safety risks.
Innovation Solution
A simplified safety switch design featuring a pivotable switch member, flexible bi-metallic contact plate, and a link mechanism with biasing plates that ensures complete deformation of the bi-metallic plate under overload, preventing reconnection and reducing part count for lower manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional safety switch devices use multiple parts to ensure bi-metallic plate deformation, then the deformation guidance is provided, but the assembly complexity increases and manufacturing cost increases
Solution Approach 1:
The patent integrates the guide structure directly into the switch body as an integrated component rather than using separate guide parts. This merging approach provides the necessary deformation guidance for the bi-metallic plate while reducing the total number of parts and simplifying assembly, directly resolving the contradiction between deformation accuracy and device complexity
Solution Approach 2:
The switch body is designed to serve multiple functions: it provides structural support, guides the bi-metallic plate deformation, and houses the contact points. This multi-functionality eliminates the need for separate guide components, reducing part count while maintaining precise deformation control
2Reliability
If conventional safety switch devices use multiple parts for assembly, then the structure is complete, but the assembly time increases
Solution Approach 1:
By combining the guide structure with the switch body into a single integrated component, the number of assembly steps is reduced. The integrated design ensures structural completeness is maintained while significantly reducing assembly time, as fewer parts need to be positioned and secured
3Reliability
If the bi-metallic plate deforms under overload, then the circuit is cut off, but the plate may bounce back and re-connect the circuit
Solution Approach 1:
The guide structure is pre-designed with a specific geometry that directs the bi-metallic plate deformation along a controlled path. This preliminary structural arrangement ensures that when the plate deforms under overload, it follows the guide toward permanent disconnection rather than bouncing back, maintaining reliable circuit separation
Solution Approach 2:
The guide structure acts as an intermediary between the bi-metallic plate and the contact points. It mediates the deformation process by providing a physical constraint that prevents the plate from returning to its original position, ensuring the switch remains in the OFF position after overload
4Reliability
If conventional safety switch devices have complex part arrangements, then the structure is complete, but the manufacturing cost increases
Solution Approach 1:
The integration of the guide structure into the switch body reduces the total part count and simplifies manufacturing. Fewer parts mean lower material costs, reduced assembly operations, and simplified quality control, all while maintaining complete switch functionality including bi-metallic plate guidance and circuit protection
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
The solution allows for complete and reliable deformation of the bi-metallic plate, ensuring safe disconnection and avoiding accidental reconnection, while reducing the number of parts and assembly complexity, thus enhancing safety and reducing production costs.
Implementation Method 1
A bi-metallic plate which is deformed when overloaded so as to separate the two contact points
Implementation Method 2
the bi-metallic plate to be deformed as desired when overloaded
Implementation Method 3
A contact plate is a curve flexible metal plate
Data Source
AI summary
A switch device includes a body with a switch member pivotably engaged with a top opening of the body and a first terminal and a second terminal respectively extend through a bottom of the body. A bi-metallic plate has a first end fixed to the first terminal and includes a first contact point which is located above a second contact point on the second terminal. A link has an upper end pivotably connected with a protrusion on an underside of the switch member and a lower end of the link clamps the second end of the bimetallic plate. The protrusion includes an engaging hole and an extension slot is in communication with the engaging hole. The upper end of the link has a biasing plate which contacts a contact portion in the body so as to provide a potential force to keep the link upright. When overloaded, the bi-metallic plate is deformed upward and the upper end of the link is moved into the extension slot to ensure that the bi-metallic plate is deformed completely.