Annular Grooved Sliding Component for Eccentric Rotation Friction
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Solution Overview
Problem
The existing scroll compressor with an eccentric mechanism experiences high frictional resistance due to the sliding surface interaction between the thrust plate and the movable scroll, affecting the operation of the compressor.
Innovation Solution
A sliding component with annular grooves is introduced, allowing fluid to flow into the grooves using dynamic pressure generated during eccentric rotation, forming a fluid film that reduces frictional resistance by slightly separating the sliding surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the sliding surface of the thrust plate is pressed against the back surface of the movable scroll to maintain back pressure, then the back pressure chamber can maintain pressure, but the frictional resistance of the sliding surface becomes large and affects the operation of the movable scroll
Solution Approach 1:
A fluid film is introduced as an intermediary between the thrust plate and movable scroll sliding surfaces. The fluid film, maintained by grooves that generate dynamic pressure, separates the two sliding surfaces and reduces direct contact friction while still allowing the back pressure to be effectively transmitted through the fluid medium.
Solution Approach 2:
The invention uses fluid pressure (pneumatics/hydraulics) by introducing a fluid into the groove on the sliding surface. The relative eccentric rotation generates dynamic pressure in the fluid, creating a pressure-bearing film that supports the load and reduces friction between the thrust plate and movable scroll.
2Productivity
If the sliding surfaces are pressed together to reduce axial refrigerant leakage, then compression efficiency is enhanced, but frictional resistance increases and affects operation
Solution Approach 1:
The fluid film acts as an intermediary that allows the sliding surfaces to remain closely spaced (maintaining compression efficiency and reducing leakage) while preventing direct solid-to-solid contact. The fluid mediates between the need for close spacing and the need to reduce friction.
Solution Approach 2:
The invention changes the physical state and pressure parameters of the fluid in the groove. By generating dynamic pressure through relative motion, the fluid transitions to a high-pressure state that provides sufficient lubrication force to reduce friction while maintaining the close spacing needed for compression efficiency.
3Ease of operation
If grooves are formed in the sliding surface to generate dynamic pressure and reduce friction, then lubricity is improved, but the structure becomes more complex
Solution Approach 1:
The sliding surface is segmented by forming grooves that divide the surface into functional zones. The grooves create discrete channels for fluid introduction and pressure generation, transforming a simple flat surface into a segmented structure that actively manages lubrication through dynamic pressure zones.
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 reduces frictional resistance and improves lubricity between the sliding surfaces, enhancing the operational efficiency of the compressor by stabilizing dynamic pressure distribution over the entire circumference.
Implementation Method 1
a fluid is capable of flowing into the groove from an external space through the space between sliding surfaces using the dynamic pressure generated in the groove provided in the sliding surface relatively sliding with eccentric rotation
Implementation Method 2
by slightly separating the sliding surfaces from each other and forming a fluid film, the lubricity between the sliding surfaces is improved and the frictional resistance of the sliding surface can be reduced
Data Source
AI summary
Provided is a sliding component capable of reducing the frictional resistance of a sliding surface entailing eccentric rotation. A sliding component is formed in an annular shape and has a sliding surface relatively sliding with eccentric rotation. A plurality of grooves not communicating with spaces on the inner and outer diameter sides of the sliding component are circumferentially provided in the sliding surface.