Elliptical Cylinder Rotary Compressor for Over-Compression Control
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Solution Overview
Problem
Conventional vane rotary compressors face issues such as increased frictional loss, refrigerant leakage, and reduced compression efficiency due to symmetrical inner circumferential surfaces, over-compression, and limited control over compression chamber volumes, leading to inefficiencies and increased pressure differences.
Innovation Solution
The use of a hybrid cylinder with an asymmetrical elliptical inner circumferential surface and optimized discharge openings, along with inclined vanes and controlled compression periods, minimizes over-compression and refrigerant leakage, and enhances compression efficiency by varying the suction and compression periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a symmetrical elliptical inner circumferential surface is used, then manufacturing is simplified, but compression efficiency is reduced due to over-compression and inability to control suction/compression periods
Solution Approach 1:
The patent applies asymmetry by designing the inner circumferential surface with different ellipse segments (first ellipse segment and second ellipse segment) having different eccentricities and orientations. The first ellipse segment has its major axis at a different angle than the second ellipse segment, creating an asymmetrical shape that enables independent control of suction and compression periods, thereby improving compression efficiency while avoiding over-compression issues
Solution Approach 2:
The patent applies local quality by giving different geometric properties to different segments of the inner circumferential surface. The first ellipse segment and second ellipse segment have different eccentricities, major axis orientations, and curvature characteristics. This allows each segment to be optimized for its specific function: one segment controls suction period while the other controls compression period, enabling precise local control over the compression process
2Productivity
If vanes slide against the inner circumferential surface during rotation, then compression chamber volume can be controlled, but frictional loss increases
Solution Approach 1:
The patent applies dynamics by designing the inner circumferential surface with varying curvature radii that change continuously along the circumferential direction. The curvature radius is optimized at different positions to dynamically adjust the contact conditions between vanes and the cylinder surface. This dynamic geometric design reduces frictional loss by minimizing sliding resistance while maintaining effective compression chamber volume control throughout the rotation cycle
3Loss of energy
If a circular inner circumferential surface is used, then frictional loss is reduced, but compression efficiency and volume control capability are limited
Solution Approach 1:
The patent applies curvature principles by designing the inner circumferential surface as an asymmetrical ellipse rather than a circle. The ellipse has varying curvature radii at different circumferential positions, with the first ellipse segment and second ellipse segment having different curvature characteristics. This curved geometric design enables better compression efficiency and volume control compared to a circular shape, while the optimized curvature distribution minimizes frictional loss by reducing abrupt changes in contact geometry
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 design reduces frictional loss, minimizes refrigerant leakage, and improves compression efficiency by controlling the suction and compression periods, resulting in enhanced motor performance and reduced over-compression.
Implementation Method 1
a roller provided to be eccentric from the inner circumferential surface of the cylinder, and configured to change a volume of the compression chamber by being rotated
Implementation Method 2
a vane formed to be withdrawn towards the inner circumferential surface of the cylinder when the roller is rotated, and configured to divide the compression chamber into a plurality of spaces
Implementation Method 3
the vanes slide as front end surfaces thereof contact an inner circumferential surface of a cylinder. This may cause a frictional loss to be increased
Data Source
AI summary
A hermetic compressor may include a cylinder having an elliptical inner circumferential surface; a roller eccentric from the inner circumferential surface; and at least one vane withdrawn towards the inner circumferential surface when the roller is rotated to divide a compression chamberspace into compression chambers. On the basis ofA first center line passes through a contactreference point where the inner circumferential surface of the cylinder and an outer circumferential surface of the roller are closest, a first center line passesand through a lateral center of an inner space of the cylinder, an. A first pair of ellipse segments are positioned at a first side of the first center line and formingform portions of the inner circumferential surfaceis a first ellipse, a. A center point of the first pair of ellipse segments is a first center point, an. A second pair of ellipse segments are positioned at a second side of the first center line and formingform portions of the inner circumferential surface is a second ellipse, a. A center point of the second pair of ellipse segments is a second center point, and the first center point and the second center point are spaced apart from the lateral center of the inner space of the cylinder.