Mechanical Seal Conductive Path for Rotary Shaft Charge Release
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Solution Overview
Problem
In high-efficiency motors, the rotary shaft tends to become electrified due to friction and contact with sealed fluids, leading to electric charge accumulation, which can result in instantaneous electrical discharges damaging the ball bearing when the charge exceeds a certain threshold.
Innovation Solution
A mechanical seal is designed with a conductive element between the fixed sealing element and the rotary shaft, allowing electric charge to be released to the housing, preventing accumulation on the rotary shaft. This includes features like a brush member or carbon brush fixed to the fixed seal ring holder, ensuring structural stability and easy energization of the rotary shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical seal is used to seal the space between the housing and rotary shaft, then fluid leakage is prevented, but electric charge accumulates on the rotary shaft due to friction and contact with sealed fluid
Solution Approach 1:
A conductive element is introduced as an intermediary between the fixed sealing element and the rotary shaft. This conductive element provides a dedicated electrical conduction path that allows accumulated charge to be safely discharged to the housing, preventing charge buildup while maintaining the sealing function. The conductive element acts as a mediator that handles the electrical aspect without interfering with the mechanical sealing performance.
2Object-affected harmful factors
If a conductive element is added between the fixed sealing element and rotary shaft, then electric charge can be released to the housing, but the device complexity increases
Solution Approach 1:
The conductive element is merged with the existing fixed sealing element structure. Rather than being a completely separate component, the conductive element is integrated into the fixed sealing element, allowing electrical conduction to be achieved through the sealing structure itself. This integration approach minimizes additional complexity while effectively preventing charge accumulation.
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 electric charge accumulation on the rotary shaft, reducing the risk of electrical discharges and maintaining the energized state of the shaft, thus protecting the ball bearing and ensuring reliable operation.
Implementation Method 1
a conductive element is provided between the fixed sealing element and the rotary shaft or a rotary shaft member fixed to the rotary shaft... the electric charge electrified on the rotary shaft can be released to the housings by the conductive element
Implementation Method 2
This includes features like a brush member or carbon brush fixed to the fixed seal ring holder, ensuring structural stability and easy energization of the rotary shaft
Data Source
AI summary
A mechanical seal capable of preventing charge accumulation on a rotary shaft includes a fixed sealing element which is held at an inner periphery of housing members of machines to be installed and has at least a fixed seal ring, and a rotating sealing element which is held at an outer periphery of a rotary shaft rotatably supported in the housing members and has at least a rotating seal ring. A conductive element is provided between the fixed sealing element 10 and the rotary shaft or a rotary shaft member fixed to the rotary shaft.