Scroll Compressor CSPS Mechanism for Radial Compliance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing scroll-type fluid displacement devices face issues with friction wear and power loss due to axial thrust forces, especially in oil-free environments, and require improvements in energy efficiency and durability.
Innovation Solution
The implementation of a central drive shaft-sliding knuckle combined with a peripheral crank pin-swing link mechanism (CSPS) provides radial and axial compliant capabilities, along with dual radial ball bearings and an orbiting dual thrust ball bearing mechanism to reduce friction wear and loss, extending bearing life and improving sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a peripheral crank pin-sliding knuckle mechanism is used to provide radial compliant capability, then radial compliance is improved, but very small relative sliding motion causes fast wear of parts in oil-free environment
Solution Approach 1:
The patent replaces the sliding friction-based crank pin-knuckle mechanism with a rolling contact ball bearing system. The ball bearing converts the harmful sliding motion into rolling motion, dramatically reducing friction and wear while maintaining the radial compliant capability. This substitution of mechanical contact type directly resolves the wear problem in oil-free environments.
2Loss of energy
If traditional thrust ball bearings are used to bear axial thrust forces, then friction wear and power loss are reduced, but the balls circle locally at an orbiting radius which reduces bearing life
Solution Approach 1:
The patent extracts the orbiting motion from the ball bearing system by using a fixed thrust ball bearing that only handles axial thrust forces while a separate mechanism (the improved crank pin-swing link mechanism) handles the radial orbiting motion. This separation of functions allows the thrust bearing to operate in its optimal fixed position, extending its life while still reducing friction power loss.
Solution Approach 2:
The bearing system is segmented into two distinct components: a fixed thrust ball bearing for axial load and a separate radial compliant mechanism for orbiting motion. This segmentation allows each component to be optimized for its specific function, with the thrust bearing having unlimited life in its fixed position while the radial mechanism handles the dynamic orbiting requirements.
3Loss of energy
If non-traditional thrust ball bearings are used to bear axial thrust forces, then friction wear and power loss are reduced, but the structure becomes technically complicated and costly to produce
Solution Approach 1:
The patent employs a universal fixed thrust ball bearing design that is already standardized and widely available in the industry. This standard component handles axial thrust forces efficiently without requiring complex custom designs, thereby reducing friction power loss while avoiding increased complexity and cost. The solution leverages proven, multi-functional standard bearings rather than specialized custom components.
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 CSPS mechanism enhances the radial and axial compliance of scroll-type fluid displacement devices, reducing friction wear and power loss, extending bearing life, and improving energy efficiency and durability by ensuring radial load-bearing capabilities and minimizing axial thrust forces.
Implementation Method 1
non-traditional thrust ball bearings to utilize the rolling effects of balls to bear thrust forces
Implementation Method 2
peripheral crank pin-swing link mechanism (CSPS) to provide an orbiting scroll with radial and axial compliant capability
Implementation Method 3
central drive shaft-sliding knuckle combined with a peripheral crank pin-swing link mechanism
Data Source
AI summary
A central drive shaft-sliding knuckle combined with a peripheral crank pin-swing link mechanism (CSPS) to provide an orbiting scroll with radial and axial compliant capability. The CSPS mechanism can be applied to both dual floating scroll and single floating scroll structures to improve performances of scroll devices, particularly in oil-free operations. In addition, an orbiting dual thrust ball bearing mechanism is provided to take thrust load in, for example, a floating scroll compressor with a CSPS mechanism.