Mechanical Seal Face Dimple Layout for Low-Friction Sliding
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Solution Overview
Problem
Existing mechanical seals face challenges in optimizing sliding characteristics across a wide range of bearing characteristics due to the lack of examination of dimple opening diameters' influence on friction coefficient, despite advancements in dimple depth for temperature stability and liquid lubrication.
Innovation Solution
Randomly arranging dimples on the sealing face with opening diameters between 30 to 100 µm and depths within 50 to 1,000 nm, and an area ratio of 30 to 50%, to improve sliding characteristics and reduce friction coefficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dimples are provided on the sealing face to reduce friction coefficient, then sliding characteristic is improved, but sealing property may deteriorate
Solution Approach 1:
The sealing face is designed with dimples having specific depth ranges (5-30 μm) and area ratios (30-50%) to create local variations in surface properties. This allows the dimples to provide lubrication in specific zones while maintaining sealing capability in other areas, thus improving sliding characteristic without compromising sealing property.
Solution Approach 2:
The invention optimizes the dimple parameters including depth (5-30 μm), area ratio (30-50%), and distribution pattern to achieve the best balance between friction reduction and sealing performance. By carefully controlling these parameters, the system maintains reliable sealing while significantly improving sliding characteristic.
2Ease of operation
If dimple depth is increased to improve liquid lubrication, then sliding characteristic is improved, but manufacturing precision and structural integrity may deteriorate
Solution Approach 1:
The invention specifies an optimal dimple depth range of 5-30 μm that provides sufficient liquid lubrication while remaining manufacturable with conventional precision machining techniques. This parameter optimization ensures both improved sliding characteristic through better lubrication and maintainable manufacturing precision.
3Reliability
If dimples are arranged to stabilize liquid and gas phases, then sealing performance is improved, but device complexity increases
Solution Approach 1:
The sealing face features dimples with specific local characteristics (depth of 5-30 μm, area ratio of 30-50%) that create favorable conditions for liquid-gas phase separation. This local quality approach improves sealing performance by stabilizing the phases at the sealing interface without requiring complex overall arrangement patterns, thus avoiding excessive device complexity.
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 improves sliding characteristics across a wide range of bearing characteristics, reduces friction coefficient, and maintains sealing and lubricity, with enhanced performance at extremely low speeds.
Implementation Method 1
a load capacity due to a fluid bearing pressure generated in a fluid lying between the sealing face and the opposing sealing face at the time of sliding is decreased at part of the dimples
Implementation Method 2
providing a large number of dimples on this sealing face, wear resistance is improved and a liquid lubricating property by the dimples is improved
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3
AI summary
By randomly arranging dimples provided on a sealing face, a sliding characteristic is improved in a wide range of a bearing characteristic number on the sealing face. A pair of sliding parts in which a plurality of dimples is arranged on at least one of sealing faces that relatively slide on each other is characterized in that each of the plurality of dimples is provided independently from the other dimples, and arranged in such a manner that the plurality of dimples having different opening diameters is randomly distributed.