Rotary Compressor Vane Attachment Design to Reduce Abrasion and Cost
Solution Overview
Problem
The existing rotary compressors in refrigeration cycle devices face high costs due to abrasion of the vane apical end portions and inefficiencies in attaching the vanes, which necessitate improved abrasion prevention and attachment efficiency.
Innovation Solution
The design incorporates a two-cylinder type rotary compressor with first and second vanes that are biased by coil springs, featuring equal dimensioned attachment portions and a symmetrical structure to reduce contact pressure and prevent abrasion, allowing for easier and more efficient attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a special surface treatment is applied to the vane apical end portion to prevent abrasion, then the abrasion resistance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent applies local quality by providing reinforcement portions only at specific locations (the apical end portions of the vanes) rather than treating the entire vane. These reinforcement portions have increased thickness or density specifically where contact with the roller occurs, providing localized abrasion resistance without the need for expensive surface treatments across the whole component.
Solution Approach 2:
The patent employs composite material structure by combining base vane material with reinforcement portions that have different properties. The reinforcement portions may be made of different materials or have different structural characteristics (such as increased thickness or cross-sectional area) to provide enhanced wear resistance at the contact points while maintaining the original material properties in other areas.
2Ease of manufacture
If the vane structure is simplified to reduce cost, then the manufacturing cost decreases, but the attachment efficiency deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the vane into distinct functional portions: the main body portion and the reinforcement portions at the apical ends. This segmentation allows each part to be optimized independently - the main body can be simple and easy to manufacture, while the reinforcement portions are specifically designed for durability and attachment efficiency at the critical contact points.
3Productivity
If the contact pressure between the vane and roller is increased to improve compression performance, then the compression efficiency is improved, but the abrasion of the vane apical end portion increases
Solution Approach 1:
The patent implements beforehand cushioning by pre-installing reinforcement portions at the vane apical end portions before the compressor operates. These reinforcement portions act as a protective buffer that can withstand the high contact pressures during compression while preventing the base material from experiencing excessive stress and abrasion. The reinforcement portions are designed to absorb and distribute the contact forces.
Solution Approach 2:
The patent applies parameter changes by modifying the physical parameters of the vane at the contact points - specifically increasing the thickness, cross-sectional area, or material density of the reinforcement portions. This parameter modification allows the vane to withstand higher contact pressures necessary for good compression efficiency while the changed parameters (increased size/strength) simultaneously provide resistance against abrasion.
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
This configuration effectively reduces abrasion of the vane apical end portions, decreases contact pressure, and enhances the attachment efficiency, thereby lowering costs and improving the operational reliability of the refrigeration cycle device.
Implementation Method 1
a bias member which biases the first and second vanes toward the roller
Data Source
AI summary
In one embodiment, a compression mechanism unit of a rotary compressor includes a cylinder includes a cylinder chamber, a roller in the chamber, first and second vanes which come into contact with the roller and partition the chamber into a compression side and an absorption side, and a bias member which biases the vanes. On both end sides of a posterior end portion of the first vane, first vane side attachment portions having an equal dimension in the axial direction are provided. On both end sides of the second vane along the axial direction of the axis, second vane side attachment portions having an equal dimension in the axial direction are provided. The vanes are attached to the bias member via the attachment portions.