Annular Sliding Components With Deep Grooves for Clean Dynamic Pressure
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Solution Overview
Problem
Contamination such as abrasion powder and dust accumulates in the dynamic pressure generation grooves of sliding components, potentially deteriorating the dynamic pressure generation function and causing non-uniform contact between sliding surfaces.
Innovation Solution
A pair of sliding components with a first sliding component featuring shallow dynamic pressure generation mechanisms and a second sliding component with deeper grooves, where the deep grooves overlap with the shallow grooves during rotation, directing contamination away from the shallow grooves and ensuring efficient fluid flow and dynamic pressure generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a dynamic pressure generation groove is provided in the sliding component to improve lubricity and reduce friction, then the energy loss due to sliding is reduced, but contamination accumulates in the groove causing deterioration of the dynamic pressure generation function
Solution Approach 1:
The groove structure is segmented into two distinct parts: a shallow dynamic pressure generation groove (depth 0.1-10μm) for generating dynamic pressure, and a deep contamination collection groove (depth 1-100μm) for trapping contamination. This segmentation allows each groove to perform its specific function independently, preventing contamination from affecting the dynamic pressure generation function.
Solution Approach 2:
The contamination collection function is extracted from the dynamic pressure generation groove and placed into a separate deep groove. By taking out the contamination collection role from the shallow groove, the dynamic pressure generation function is protected from contamination accumulation while the deep groove handles all contamination trapping.
2Object-affected harmful factors
If the groove depth is increased to trap more contamination, then contamination accumulation is suppressed, but the dynamic pressure generation function is weakened
Solution Approach 1:
Different groove depths are applied at different locations: a shallow groove (0.1-10μm) in the dynamic pressure generation region to maintain lubricity and reduce energy loss, and a deep groove (1-100μm) in the contamination collection region to trap contamination. This local differentiation allows each region to have the optimal groove depth for its specific function.
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
Prevents contamination accumulation in the dynamic pressure generation mechanism, maintaining the dynamic pressure generation function and ensuring uniform contact between sliding surfaces, thereby enhancing the sealing efficiency and reducing friction.
Implementation Method 1
a dynamic pressure generation groove is provided in a sliding surface of the sliding component to communicate with an outer radial side which is a sealed liquid side
Implementation Method 2
contamination is not easily accumulated in the shallow groove of the dynamic pressure generation mechanism due to a fluid moving from the shallow groove to the deep groove
Data Source
AI summary
A pair of sliding components formed in an annular shape and disposed at a relatively rotating position of a rotary machine are constituted by a first sliding component 10 and a second sliding component. A sliding surface of the first sliding component has a plurality of dynamic pressure generation mechanisms each of which includes at least a shallow groove communicating with a leakage side. A sliding surface of the second sliding component has deep grooves each of which has a dimension deeper than that of the shallow groove of each of the dynamic pressure generation mechanisms and communicates with the leakage side, each of the deep grooves overlapping with the shallow groove each of the dynamic pressure generation mechanisms during relative rotation of the first and second sliding components.