Mechanical Seal Ring Asymmetric Coating for Distortion Control
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Solution Overview
Problem
Existing mechanical seal rings face distortion and reduced plane-parallelism due to one-sided coating, leading to premature wear and reduced operational lifespan under extreme loads.
Innovation Solution
A seal ring design where both face sides of the base body are coated with layers, with at least one serving as a slide surface, to prevent distortion and maintain high flatness, using materials with matching or differing thermal expansion coefficients to compensate for geometric changes, and potentially varying thicknesses to manage thermal stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If only one face side of the base body is coated with slide material, then the manufacturing process is simpler and cost lower, but the seal ring undergoes distortion and loses plane-parallelism during operation
Solution Approach 1:
The patent applies coating asymmetrically - one face side receives a thick slide material coating while the opposite side receives a thin compensating coating, creating an asymmetric structure that deliberately balances thermal expansion to maintain plane-parallelism during operation
Solution Approach 2:
The patent changes the coating thickness parameter between the two face sides - one side has a thick coating for wear resistance while the other has a thin coating for distortion compensation, optimizing both wear resistance and geometric stability
2Duration of action of moving object
If a thick slide layer is applied to increase wear resistance, then the running time of the seal is extended, but the distortion of the base body increases
Solution Approach 1:
The patent converts the harmful thermal expansion distortion caused by thick coating into a beneficial effect by applying a compensating coating on the opposite side, where the distortion from the thin coating counterbalances the distortion from the thick coating, maintaining overall geometric stability
Solution Approach 2:
The thin compensating coating acts as an anti-weight to the thick slide material coating, where the opposite thermal expansion effects counterbalance each other, preventing net distortion of the base body while maintaining the wear resistance benefits of the thick coating
3Reliability
If the seal ring is designed for high wear resistance under extreme loads, then the operational lifespan is extended, but the cost of materials and manufacturing increases
Solution Approach 1:
The patent applies local quality by concentrating the expensive thick slide material coating only on the face side that requires maximum wear resistance, while the opposite side receives a minimal thin compensating coating, optimizing material usage and reducing overall manufacturing cost
Solution Approach 2:
The patent uses composite material structure combining the base body with two different coating layers of varying thicknesses - a thick wear-resistant layer and a thin compensating layer - creating a composite structure that optimizes both performance and cost
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 prevents distortion, ensures high plane-parallelism, and extends operational lifespan by allowing for longer wear resistance and potential dual-use functionality as a reversing seal ring, enabling prolonged service under extreme conditions.
Implementation Method 1
owing to the different thermal expansion of the coating material and the base body, distortions always occur during the coating process
Data Source
AI summary
A seal ring for a mechanical seal, comprising a base body, a first layer applied to a first face side of a base body, and a second layer applied to a second face side of the base body. At least one of the layers is configured as a slide surface of the seal ring.