Compliant Joint Insulation Assembly for Torque Transfer Isolation
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Solution Overview
Problem
In motorized ball valve systems, especially in wet environments, there is a risk of electrical faults from the motor being transmitted to the metal ball shaft, causing issues like electric shocks or arcing, and motor failures can prevent the ball shaft from being rotated, necessitating a solution for dielectric separation while maintaining torque transmission.
Innovation Solution
A dielectric insulating assembly with a disk of dielectric material and pre-loaded fastening elements is placed between the electric motor and the ball shaft, providing a dielectric barrier and ensuring torque transfer through frictional engagement, using materials like PEEK or ceramic for insulation and aramid fibers for tension loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric barrier is provided between the motor and ball shaft, then electrical insulation is improved, but torque transmission capability deteriorates
Solution Approach 1:
A dielectric insulating assembly is introduced as an intermediary component between the motor and ball shaft. This assembly includes a dielectric barrier that provides electrical insulation while incorporating torque transmission elements (such as metallic protrusions or friction surfaces) that enable mechanical torque transfer across the dielectric barrier, thus resolving the contradiction between electrical insulation and torque transmission
Solution Approach 2:
The dielectric insulating assembly utilizes composite material structures combining dielectric materials (for insulation) with torque transmission features. The assembly may include layers or components of different materials - dielectric materials for electrical isolation and conductive/metallic elements for mechanical torque transfer - creating a composite structure that simultaneously achieves both electrical insulation and torque transmission functions
2Force
If pre-loaded fastening elements are used, then torque transmission is improved, but device complexity increases
Solution Approach 1:
The fastening elements serve dual functions: they mechanically secure the dielectric insulating assembly in place and simultaneously transmit torque from the motor to the ball shaft. By combining the fastening and torque transmission functions into a single component, the overall device complexity is minimized while achieving effective torque transfer
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 effectively prevents electrical conduction between the motor and ball shaft, allowing for torque transmission even during motor failures and maintaining system operation, while ensuring safety and durability in wet environments.
Implementation Method 1
a disk of dielectric material... providing a dielectric barrier
Implementation Method 2
ensuring torque transfer through frictional engagement
Data Source
Figure 1~2
Figure 3~4
Figure 5A~6A
AI summary
A dielectric insulating assembly (20) arranged to be positioned between a drive shaft and a driven shaft of a motorised drive assembly, the assembly comprising dielectric insulation between the drive shaft and the driven shaft and plurality of electrically non-conductive fastener elements configured to connect the drive shaft to the driven shaft and the dielectric insulation therebetween, in torque transfer engagement, the fasteners located around an outer boundary of the dielectric insulation.