Wavy Groove Sliding Surface for Eccentric Rotation Friction Reduction
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Solution Overview
Problem
In scroll compressors, the frictional resistance between sliding surfaces with eccentric rotation increases due to the pressing force from both axial sides, hindering smooth operation and efficiency.
Innovation Solution
A sliding component with a dynamic pressure generation groove on its surface, featuring side walls extending in a waveshape with radial amplitude, generates dynamic pressure at multiple points to reduce frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thrust plate presses the movable scroll toward the fixed scroll using compressed refrigerant, then refrigerant leakage from the axial gap is reduced, but frictional resistance increases and smooth operation is hindered
Solution Approach 1:
The patent uses compressed refrigerant (fluid pressure) to generate dynamic pressure in the grooves on the sliding surface of the movable scroll. This pneumatic mechanism creates a pressure distribution that lifts the sliding surface, reducing frictional resistance while maintaining the pressing force necessary to prevent refrigerant leakage from the axial gap between scrolls.
2Reliability
If pressing force acts from both axial sides between the two scrolls, then refrigerant leakage is reduced, but frictional resistance increases and compression efficiency cannot be enhanced
Solution Approach 1:
The patent employs fluid pressure from compressed refrigerant to generate dynamic pressure within grooves on the sliding surface. This creates a lifting effect that reduces friction between the movable and fixed scrolls, allowing the pressing force to effectively reduce leakage without proportionally increasing frictional losses, thereby maintaining compression efficiency.
Solution Approach 2:
The patent changes the physical state and pressure distribution of the refrigerant by introducing grooves with specific geometries (depth, width, spacing) on the sliding surface. These parameter changes enable the refrigerant to generate dynamic pressure that reduces friction while maintaining the necessary axial pressing force for leakage prevention.
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 dynamic pressure generation groove stabilizes the separation of sliding surfaces, reducing frictional resistance and enhancing operational efficiency.
Implementation Method 1
the sliding surface is provided with a dynamic pressure generation groove defined by side walls extending in a circumferential direction, at least one of the side walls being formed in a waveshape with amplitude in a radial direction. Accordingly, it is possible to ensure a plurality of intersection surfaces generating dynamic pressure
Data Source
AI summary
Provided is a sliding component capable of stably reducing the frictional resistance between sliding surfaces entailing eccentric rotation. A sliding component has a sliding surface relatively sliding with eccentric rotation. The sliding surface is provided with a dynamic pressure generation groove defined by side walls extending in a circumferential direction. At least one of the side walls is formed in a waveshape with amplitude in a radial direction.