Two-Lobe Rotary Machine Eccentric Rotor Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing two-lobe rotary machines face limitations in achieving balanced operation, continuous flow, and increased power strokes due to constraints in rotor stroke length and alignment, which affect their efficiency and torque output, especially at high RPMs.
Innovation Solution
The design incorporates two lenticular rotors with eccentric crank pins and a rotor positioning mechanism that maintains the apexes within a defined orbital pattern, allowing for longer rotor lengths while maintaining shaft alignment, and uses a reversing gear mechanism or timing belt to transmit torque, enabling improved flow and power displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the stroke is increased by locating the positioning mechanism outside the sidewalls of the chamber, then the distance between apexes can be reduced to twice the stroke, but the rotor tips will come out of contact with the housing at the center of the least volume portion and the rotor will not clear the protrusion
Solution Approach 1:
A radially adjustable vane is introduced as an intermediary element between the rotor and the housing. The vane moves inward to seal against the rotor tip as it passes over the protrusion, and outward to allow clearance of the rotor periphery, thereby mediating the conflict between maintaining rotor contact and ensuring clearance
Solution Approach 2:
The vane is made radially adjustable rather than fixed, allowing it to dynamically change its position between inward (sealing) and outward (clearance) states to adapt to the rotor's position during rotation
2Volume of moving object
If a vane radially displaced adjusting to the surface of the rotor is used, then the rotor can be made smaller, but the positioning mechanism becomes more complex with components on either side of the rotor
Solution Approach 1:
The positioning mechanisms on both sides of the rotor are merged through the reversing gear mechanism, which allows torque transmission through the rotor and powers the opposing side, reducing the number of independent positioning systems required
3Speed
If the rotor is designed for high speed rotation, then aerodynamic effects become significant for thrust production, but the machine complexity increases due to the need to optimize multiple aerodynamic parameters
Solution Approach 1:
The rotor shape is optimized for aerodynamic effects at high speeds, and the housing inner wall position is adjusted to control flow characteristics, changing geometric parameters to achieve desired aerodynamic performance
Data Source
AI summary
Two rotors with two lobes are eccentrically mounted within the chamber of a two-lobe rotary machine. The rotors have a periphery defined by a the path of the opposing rotor apex.