Abstract
Scroll profile plays a key role in determining the performance of a scroll compressor. In this study geometric and dynamic characteristics of the scroll profile are analyzed to investigate the influence of its geometric continuity on property of a scroll compressor. Firstly, scroll profiles are created to redesign the geometry of scroll wrap by using the equidistant-curve approach on the basis of a generation line consisting of involute of circle and circular arc. Subsequently, the geometric and dynamic models of the scroll compressor are established. These models are related to parameters of the generation line of scroll profile and rotation angle of a moving scroll. Lastly, some simulation examples of second-order continuity (SOC) scroll profile are compared with first-order continuity (FOC) scroll profiles and some important conclusions are obtained. Results show that SOC scroll profile is superior to FOC profile in terms of volume ratio, stability of gas force, and possible leakage loss in a scroll compressor.
Highlights
Scroll compressors are widely used for compressing air or refrigerants in refrigerators and air conditioners
(3) Tangential gas forces exerted on moving scroll with first-order continuity (FOC) and second-order continuity (SOC) profiles are compared in Figure 11 and Table 2
This paper proposed a way to redesign the geometry of scroll wrap in which the central and main part of the profile
Summary
Scroll compressors are widely used for compressing air or refrigerants in refrigerators and air conditioners. Afterwards, Lee and Wu [9] gave an analytical method to design scroll profile with first-order continuity (FOC). These foregoing researches had focused on interpolating scroll profile by using circular arcs with geometry condition to zero order or FOC for a scroll compressor. Gravesen and Henriksen [11] redefined the scroll geometry by radius of curvature as a function of tangent direction. This paper presents a new design of SOC top scroll profile with circular arcs curves based on the curvature radius function proposed by Gravesen and Henriksen [11]. The results suggest many advantages of SOC scroll profiles over FOC ones
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