Mechanical Seal Resin Coating for O-Ring Sliding
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Solution Overview
Problem
Existing mechanical seals face issues with the stationary sealing ring not moving smoothly due to high contact resistance between O-rings and a metal seal case, leading to ineffective sealing and potential damage to sealing end faces, especially when seal gas supply stops, resulting in gaps or intense collisions.
Innovation Solution
A resin coating film is applied to the periphery of the metal seal case, allowing O-rings to slide smoothly and reducing contact resistance, ensuring the stationary sealing ring moves effectively while preventing metal ions from contaminating the sealed fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the seal case is made of metal to ensure strength, then the structural strength is improved, but the contact resistance between O-rings and seal case increases, causing poor sliding performance
Solution Approach 1:
A resin coating layer is applied to the inner peripheral surface of the metal seal case to serve as an intermediary between the O-rings and the metal surface. This coating layer has low friction characteristics that enable smooth sliding of O-rings while the metal seal case maintains its structural strength. The resin coating acts as a mediator that decouples the conflicting requirements of strength and sliding performance.
2Reliability
If the O-rings are held engaging with the stationary sealing ring to provide secondary seal, then the sealing function is improved, but the following ness of the stationary sealing ring deteriorates due to high contact resistance
Solution Approach 1:
The resin coating on the seal case inner surface acts as an intermediary that reduces friction between the O-rings and the seal case. This enables the stationary sealing ring to move smoothly in the axial direction while maintaining the secondary sealing function provided by the O-rings. The coating allows the O-rings to slide freely, ensuring the stationary sealing ring follows the rotary sealing ring's movements effectively.
3Reliability
If the stationary sealing ring does not move smoothly due to high contact resistance, then the sealing function is maintained, but the sealing end faces may be damaged by intensive collision when seal gas supply stops
Solution Approach 1:
The resin coating layer serves as a low-friction intermediary surface that enables smooth axial movement of the stationary sealing ring. When seal gas supply stops, the stationary sealing ring can move smoothly toward the rotary sealing ring without intensive collision, preventing damage to the sealing end faces while maintaining the sealing function.
4Ease of operation
If a resin coating film is applied to the seal case to reduce contact resistance, then the sliding performance is improved, but the device complexity increases
Solution Approach 1:
The invention changes the surface property parameter of the seal case by applying a resin coating with low friction characteristics. This parameter change (from high-friction metal surface to low-friction coated surface) improves sliding performance without fundamentally altering the overall seal structure or requiring complex additional components.
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 mechanical seal achieves excellent following and sealing functionality, preventing contamination and corrosion, even when the sealed fluid is corrosive, by using a low-friction resin coating film that covers the seal case and O-ring contact areas, ensuring reliable operation and contamination prevention in treatment devices.
Implementation Method 1
the O-rings, being held engaging with the stationary sealing ring, slide in press contact with the periphery of the seal case... the O-rings do not slide smoothly following the movement of the stationary sealing ring owing to the high contact resistance between the O-rings and the seal case
Data Source
AI summary
A mechanical non-contact gas seal including a rotary scaling ring and a stationary sealing ring that is engaged and held in an inner periphery of a seal case by means of O-rings so as to move in an axial direction thereof. The O-rings engage with the outer periphery of the stationary sealing ring and come in press contact with the inner periphery of the seal case to seal a gap between the stationary sealing ring and the seal case while allowing the stationary sealing ring to move in an axial direction. A resin coating of a thickness in the range of 5 to 100 μm is formed on the inner periphery of the seal case at least within a range in which the O-rings relatively move with the movement of the stationary sealing ring.