Rotary Engine Valve Flaps for Centrifugal Sealing
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Solution Overview
Problem
Existing rotary engines face issues with seal wear and friction due to centrifugal forces, leading to leaks and increased maintenance costs, and they suffer from inefficient energy transfer and power output.
Innovation Solution
A rotary engine design featuring a pair of valve flaps on the first rotary body that engage with the housing wall, creating separate working chambers and enhancing tightness through centrifugal force and medium compression, allowing for efficient energy transfer and reduced wear by minimizing direct contact between rotary bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slides are pressed outward against the inner housing wall using centrifugal force to seal the working chamber, then sealing tightness is improved, but wear and tear of the slides increases significantly
Solution Approach 1:
The patent introduces valve flaps as intermediary elements that are pressed against the housing wall by centrifugal force to create the seal, rather than using slides on the rotary bodies. The valve flaps rotate with the rotary body and contact the stationary housing wall, acting as a mediator between the rotating and stationary components. This resolves the contradiction by providing reliable sealing through the valve flaps while avoiding the severe wear that would occur on the rotary bodies themselves.
Solution Approach 2:
Instead of placing sealing elements directly on the rotary bodies (as in conventional slides), the patent inverts the approach by placing the sealing elements (valve flaps) on the rotary body that then press against the stationary housing wall. This inversion transfers the wear to the valve flaps which can be more easily replaced or designed with longer life, while the rotary bodies themselves experience minimal wear.
2Productivity
If two rotary bodies move in opposite directions in constant contact to compress the medium, then compression function is achieved, but friction and wear between rotary bodies increases
Solution Approach 1:
The valve flaps act as intermediaries that enable the compression function without requiring direct contact between the two rotary bodies. The first rotary body with valve flaps compresses the medium against the housing wall, and the second rotary body handles the high-pressure medium separately. This eliminates the friction and wear that would result from direct rotary body contact while maintaining the compression capability.
Solution Approach 2:
The patent segments the compression and high-pressure medium handling functions into separate rotary bodies. The first rotary body with valve flaps performs compression by pressing against the housing wall, while the second rotary body separately handles the compressed medium. This segmentation allows each component to be optimized for its specific function, reducing overall friction and wear in the system.
3Reliability
If slides are used for sealing both working chamber and compression chamber, then sealing is achieved, but spring tensional force is lost over time resulting in leaks
Solution Approach 1:
The valve flaps are designed to be self-pressing against the housing wall through centrifugal force generated during rotation. This eliminates the need for external springs that would lose tension over time. The sealing force is continuously regenerated by the rotation itself, providing long-term sealing reliability without degradation. The system serves itself by using its operational motion to maintain the sealing force.
Solution Approach 2:
The patent replaces the mechanical spring-based sealing system with a centrifugal force-based system. Instead of relying on elastic deformation of springs that degrade over time, the sealing force is generated by the centrifugal effect of the rotating valve flaps. This substitution eliminates the fundamental limitation of spring fatigue and provides sustained sealing performance throughout the operational life of the engine.
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 design achieves improved tightness and efficiency, reducing wear and maintenance costs while maintaining effective power output, with the valve flaps ensuring continuous adaptation to the housing wall and enhanced contact pressure for better sealing.
Implementation Method 1
During rotation of the first rotary body, the valve flaps are pressed against the inner wall of the housing body due to the centrifugal force
Implementation Method 2
due to an, e.g., crescent shape upon compression and expansion of a medium in the working chamber, they are pressed against the inner housing wall even more strongly
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The present invention describes a rotary engine comprising a housing body (110) having a first rotation chamber (120) and a second rotation chamber (130). A first rotary body (150) is arranged within the first rotation chamber (120), and a second rotary body (160) is arranged within the second rotation chamber (130). A boundary surface (122) of the first rotation chamber (120) has a variable distance from an opposite surface of the first rotary body (150). A pair of valve flaps comprising a first valve flap (170) and a second valve flap (180) is arranged on the first rotary body (150). Upon rotation of the first rotary body (150), the valve flaps (170, 180) are in engagement with the boundary surface (122) of the first rotation chamber (120) and are rotated in mutually opposite directions with regard to the first rotary body (150) so as to form two mutually demarcated working chambers (A, B) within the first rotation chamber (120).