Sliding Surface Groove Layout for Long-Life Mechanical Seal Lubrication
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Solution Overview
Problem
Sliding components in rotating machines face challenges in maintaining high lubricity over time due to the difficulty in guiding liquid lubricants to the radial center of the sliding surfaces, especially when the sealed fluid is gas, as the liquid is easily repelled by the relative rotation, leading to inadequate lubrication.
Innovation Solution
The design incorporates opening portions and fluid supply grooves on the sliding surfaces, extending in the circumferential direction and opening radially, allowing liquid to be efficiently guided to the radial center, with optional features like annular concave portions and multiple grooves for enhanced lubrication, forming a fluid circulation path to maintain consistent lubricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid lubricant is supplied between sliding surfaces in a mechanical seal, then lubricity is improved, but the liquid is pushed out from between the sliding surfaces over time due to relative rotation, causing lubricity to deteriorate
Solution Approach 1:
The patent introduces a lubricant supply groove and multiple supply holes in the sealing ring before operation begins. These pre-configured structures ensure that lubricant is continuously and proactively supplied to the sliding surface, counteracting the centrifugal force that would otherwise push the lubricant out during rotation. This preliminary structural preparation maintains lubricity over extended periods.
Solution Approach 2:
The lubricant supply groove acts as an intermediary structure between the external lubricant source and the sliding surface. It channels and directs the lubricant flow through multiple supply holes positioned at strategic locations, ensuring controlled delivery of lubricant to the contact interface despite the relative rotation between sealing surfaces.
2Reliability
If liquid lubricant is dropped on the edge portion of the sliding surface, then lubrication is attempted, but the liquid is difficult to guide toward the radial center and is easily repelled by relative rotation, reducing lubrication effectiveness
Solution Approach 1:
The lubricant supply groove serves as an intermediary channel that receives lubricant at the edge portion and systematically directs it toward the radial center through multiple supply holes. This structured intermediary pathway overcomes the difficulty of guiding liquid against centrifugal force during rotation, ensuring effective lubrication delivery.
Solution Approach 2:
Instead of relying on a single lubricant delivery point, the patent segments the lubricant supply into multiple holes distributed along the supply groove. This segmentation allows lubricant to be delivered at multiple locations, improving the likelihood that lubricant reaches the sliding surface effectively despite rotational movement and centrifugal forces.
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
This configuration effectively maintains high lubricity between sliding surfaces over a long period by ensuring the liquid is uniformly distributed and circulated, preventing wear and leakage, even with gaseous sealed fluids.
Implementation Method 1
the opening portion extends in the circumferential direction and opens in the radial direction so that a liquid is easily taken thereinto and the liquid taken into the opening portion is introduced into the fluid supply groove and is moved to the radial center of the sliding surface
Data Source
AI summary
Provided is a sliding component capable of maintaining high lubricity over a long period of time by efficiently using a liquid supplied between sliding surfaces. In a pair of sliding components disposed at a relatively rotating position to face each other when a rotating machine is driven, a sliding surface of the sliding component is formed on an outer peripheral edge portion and includes an opening portion extending in a circumferential direction and a fluid supply groove communicating with the opening portion and opening to a peripheral edge of the sliding surface on the side of the opening portion.