Pivoting Arc Vane Rotary Compressor Friction Reduction
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Solution Overview
Problem
Rotary vane compressor and expander engines face issues with friction, wear, seal, balance, and aerodynamic drag, leading to premature vane wear, fluid leakage, and reduced efficiency, which limits their performance and requires frequent maintenance.
Innovation Solution
A pivoting arc vane hinged to an eccentric rotor liner within a cylindrical housing, eliminating shear contact and using a single vane configuration to reduce friction and wear, with a design that allows for high compression ratios and efficient fluid processing, and incorporates a rotating valve for precise fluid control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vanes are slidably mounted in radial slots in the rotor, then the compressor or expander can be manufactured with simpler structure, but friction and wear occur leading to premature vane wear and fluid leakage
Solution Approach 1:
The patent replaces the traditional sliding vane mechanism with a rolling element system. Rollers are mounted on the vanes instead of having vanes slide directly in slots, converting sliding friction into rolling friction. This substitution dramatically reduces wear and extends component life while maintaining the basic rotary vane compression/expansion functionality
Solution Approach 2:
The patent introduces intermediate components (rollers and guide surfaces) between the vane and the slot walls. These intermediaries facilitate smooth motion while distributing contact forces, reducing localized wear, and preventing direct metal-to-metal contact that would lead to premature failure
2Device complexity
If vanes slide back and forth within slots, then the device can operate with simpler construction, but considerable heat is generated from friction causing performance loss
Solution Approach 1:
The patent replaces sliding friction with rolling friction by mounting rollers on the vanes. This mechanical substitution reduces the coefficient of friction by an order of magnitude, significantly decreasing the heat generated during operation and improving overall energy efficiency
3Ease of manufacture
If constant wear occurs on the vanes, then the device operates with simpler structure, but gaps form at contact regions causing fluid leakage
Solution Approach 1:
The patent replaces the sliding vane contact system with a rolling element system that maintains more consistent contact forces. The rollers prevent excessive wear that would create gaps, while the rolling motion allows for better tolerance compensation, maintaining sealing performance without complex adjustment mechanisms
4Productivity
If multiple vanes are used in rotary slots, then the compressor or expander can handle higher mass flow rates, but friction and wear increase requiring frequent maintenance
Solution Approach 1:
The patent applies the rolling element substitution to all vane assemblies in the system. By replacing sliding friction with rolling friction across all vane-slot interfaces, the system can accommodate multiple vanes for higher mass flow rates without proportionally increasing wear and maintenance requirements
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 enhances polytropic efficiencies, reduces the need for liquid lubricants, and decreases manufacturing costs while maintaining high-pressure and flow seal performance, resulting in a durable, efficient, and cost-effective rotary compressor or expander with reduced maintenance needs.
Implementation Method 1
The centrifugal force urges the vanes outwardly from their slots to engage the wall of the chamber
Implementation Method 2
The rotor itself is eccentrically mounted in a chamber formed in the compressor or expander housing
Data Source
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AI summary
A rotary compressor or expander include a cylindrical housing chamber, a rotatable cylindrical rotor mounted eccentrically with respect to housing chamber centre, a cylindrical rotor liner free to move around the rotor, and a pivoting generally circular arc vane hinged to the rotor liner. Cavity or buckets engraved to the outer surface of the rotor liner together with corresponding inlet nozzle flow provide additional momentum impulse transfer from working fluid to expander eccentric rotor. The inlet of the rotary expander is equipped with a rotating valve synchronous to the eccentric rotor, regulating the admission time and duration of the entering working fluid. The exhaust of the rotary compressor is equipped with either a check valve or a rotating valve synchronising the fluid discharge time and duration.