Vacuum Interrupter Push Rod Plastic Injection Molding
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Solution Overview
Problem
Existing methods for manufacturing push rods for vacuum interrupters are complex and costly, often requiring metal machining and intricate tooling for torque application, which limits efficiency and dielectric strength.
Innovation Solution
A push rod manufacturing method using a core component molded with a first plastic material, such as polyamide, embedded within a rod component made of a second plastic material, eliminating the need for metal parts and incorporating a torque twisting protection system to facilitate direct torque transfer without the need for intricate tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal parts are used for the push rod core component, then mechanical strength and torque transfer are improved, but manufacturing complexity and cost increase due to machining and intricate tooling requirements
Solution Approach 1:
The patent changes the material parameter from metal to plastic (specifically polyamide or similar engineering plastics), which fundamentally alters the manufacturing approach. Plastic injection molding replaces complex metal machining and torque application tooling, reducing manufacturing complexity while maintaining sufficient mechanical strength for the application
Solution Approach 2:
The patent replaces the mechanical torque transfer system (metal parts with threaded connections requiring wrenches) with a molded plastic integration system. The plastic push rod is directly molded with integrated features for spring retention and torque transfer, eliminating the need for separate metal components and intricate assembly tooling
2Force
If metal parts are used for the push rod, then torque transfer capability is improved, but dielectric strength deteriorates due to metal's conductive properties
Solution Approach 1:
The patent changes the material parameter from conductive metal to insulating plastic, fundamentally improving dielectric strength. The plastic material (such as polyamide) provides both sufficient mechanical strength for torque transfer and excellent dielectric properties, eliminating the contradiction between force transmission and electrical insulation
Solution Approach 2:
The patent employs composite plastic materials (such as glass fiber-reinforced polyamide) that combine the mechanical strength needed for torque transfer with the dielectric properties of plastic. This composite approach maintains force transmission capability while providing superior dielectric strength compared to pure metal construction
3Manufacturing precision
If intricate tools are used for torque application, then precise torque control is improved, but ease of operation deteriorates due to the need for specialized tooling
Solution Approach 1:
The patent designs the plastic push rod with self-contained features that eliminate the need for external torque application tools. The molded-in spring retainer and integrated mounting features allow the push rod to be installed and secured using simple operations, making the system self-sufficient and easy to operate without specialized tooling
Solution Approach 2:
The patent merges multiple functions (spring retention, torque transfer, and positioning) into a single molded plastic component. This integration eliminates the need for separate metal parts and the intricate tools required to assemble them, significantly improving ease of operation while maintaining precise torque control through the molded design
Data Source
AI summary
A method is disclosed of manufacturing a push rod for switching a vacuum interrupter by moulding the push rod with a plastic material. The push rod can include a core component configured for receiving a spring element. The push rod can also include a rod component which may include another second material, wherein a core component is embedded in the rod component to form the push rod.