Construction and Performances Research on a New Type of Variable Wall Thickness Scroll Profile
To solve the problems of low compression ratio and uncompacted structure of scroll profile with equal wall thickness,and the large variation range of gas force of traditional variable wall thickness scroll profile,a new type of scroll profile with variable wall thickness was designed,which was composed of base circle involute,high-order curve and variable base circle involute,and the basic geometric theory of the profile was established.In order to quantitatively measure the performance of the scroll profile,two key indicators representing the geometric performance of the profile,which is compression ratio and volume utilization coefficient,and two important indicators of mechanical performance,namely axial and tangential gas force were introduced to evaluate the profile.The research results show that the geometric and mechanical performances of the new variable wall thickness scroll profile are greatly affected by the radius transformation rate.Under the same design conditions,with the decrease of the radius transformation rate,not only the compression ratio and the volume utilization coefficient are significantly improved,but also the variation range of the axial and tangential gas forces are significantly reduced.It can be seen that the adoption of a new type of variable wall thickness profile with smaller radius transformation rate will help further improve the performance of the scroll profile.
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