Scroll Compressor Sliding Grooves for Lower Eccentric Friction
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Solution Overview
Problem
The existing scroll compressors face high frictional resistance due to the sliding surfaces being pressed together, which affects the operation of the movable scroll.
Innovation Solution
The scroll compressor incorporates a sliding component with grooves on its surface that generate dynamic pressure, allowing a fluid film to form between sliding surfaces, thereby reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sliding surfaces are pressed together to maintain contact, then the structural stability is improved, but the frictional resistance increases
Solution Approach 1:
A fluid film is introduced as an intermediary between the sliding surfaces of the thrust plate and movable scroll. The grooves on the sliding surface generate dynamic pressure that maintains this fluid film, allowing the surfaces to remain separated while still transmitting the necessary thrust forces, thereby reducing direct contact friction.
Solution Approach 2:
The invention utilizes hydrodynamic lubrication by forming grooves that generate dynamic pressure in the fluid film. This pneumatic/hydraulic principle creates a pressure field that supports the thrust load while maintaining surface separation, reducing frictional resistance despite the need for structural stability.
2Force
If grooves are added to the sliding surface to reduce friction, then the frictional resistance decreases, but the device complexity increases
Solution Approach 1:
Instead of modifying the entire sliding surface uniformly, grooves are strategically positioned only in specific regions where dynamic pressure generation is most effective. This localized modification approach reduces friction while minimizing the increase in device complexity by concentrating features only where needed.
Solution Approach 2:
The invention changes the geometric parameters of the sliding surface by adding grooves with specific dimensions and patterns. This parameter modification enables dynamic pressure generation that reduces friction, while the relatively simple geometric changes keep the overall device complexity increase minimal.
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 grooves stabilize dynamic pressure distribution and reduce frictional resistance, improving the efficiency and lubricity of the sliding surfaces.
Implementation Method 1
a plurality of grooves communicating with neither a space on an inner diameter side of the sliding component nor a space on an outer diameter side of the sliding component are formed in the sliding surface of at least one of the first sliding component and the second sliding component... 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
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
Figure 1
Figure 2
Figure 3(a)~3(d)
AI summary
Provided is a sliding component capable of reducing the frictional resistance of a sliding surface entailing eccentric rotation. A sliding component 7 is formed in an annular shape and has a sliding surface 7a relatively sliding with eccentric rotation. A plurality of grooves 70 not communicating with spaces 20 and 50 on the inner and outer diameter sides of the sliding component are circumferentially provided in the sliding surface 7a.