Scroll Compressor Hybrid Curve Wrap Design
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Solution Overview
Problem
Conventional scroll compressors face reliability issues due to reduced wrap thickness, leading to cracks when operating at high speeds, while maximizing compression capacity in limited spaces.
Innovation Solution
The scroll compressor design incorporates a hybrid curve for the fixed and orbiting wraps, with the center of the curve offset to increase the thickness of thinner portions and maintain compression capacity, using a combination of involute, multidimensional, and arc curves to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wrap thickness is reduced to maximize compression capacity, then the compression capacity is improved, but the reliability deteriorates due to cracks in the wrap
Solution Approach 1:
The patent applies local quality by varying the wrap thickness at different locations. The hybrid wrap design makes the outermost portion thinner to maximize compression capacity while maintaining sufficient thickness at the center portion and other critical areas to prevent cracks. This localized thickness optimization resolves the contradiction between maximizing compression capacity and ensuring wrap reliability.
2Productivity
If the compression capacity is maximized in limited space, then the productivity is improved, but the wrap thickness is reduced leading to lower reliability
Solution Approach 1:
The patent changes the geometric parameters of the wrap by introducing a hybrid curve design that combines arc and involute curves. This parameter change allows the outermost portion to have reduced thickness for maximum compression capacity while other portions maintain adequate thickness for reliability, thus resolving the contradiction between productivity and reliability in limited space.
3Productivity
If the outermost surface is formed as an arc surface to maximize compression capacity, then the productivity is improved, but the thickness distribution becomes uneven causing reliability issues
Solution Approach 1:
The patent segments the wrap curve into different portions with different geometric characteristics. The outermost portion uses an arc curve to maximize compression capacity, while the center portion and other areas use involute curves or hybrid curves to maintain adequate thickness. This segmentation of the wrap geometry resolves the contradiction between productivity improvement through arc surface and reliability maintenance through proper thickness distribution.
Data Source
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AI summary
A scroll compressor includes a fixed scroll including a fixed mirror-like surface and a fixed wrap that is extended from the fixed mirror-like surface, formed in a hybrid curve, and includes a thick portion thicker than other portions; an orbiting scroll including an orbiting mirror-like surface and an orbiting wrap extended from the orbiting mirror-like surface and formed in a hybrid curve; and a rotating shaft configured to rotate the orbiting scroll, wherein the orbiting scroll revolves relative to the fixed scroll. A center of a curve of a center portion of the fixed wrap is located at a position offset by a predetermined distance in a direction of reducing a thickness of the thick portion of the fixed wrap from a center of the fixed mirror-like surface, and a center of a curve of a center portion of the orbiting wrap is offset to correspond to the fixed wrap.