| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 106 === Unlike other types of compressors, the key components of twin-screw compressors are a pair of meshing helical rotors. Therefore, the design and analysis of the rotor tooth profile is a key factor for the performance of such compressors. In the design and development stage of the twin-screw compressor rotor, the tooth profile performance analysis and the performance comparison with the competitor models are essential and crucial. However, the complex tooth profile of rotors makes it difficult to analyze. This study proposes a numerical method, which is able to rearrange the discrete point data of rotor tooth profiles measured by the manufacturer using a coordinate measuring machine, and obtaining the meshing clearance distribution on the contact line. The method is helpful for evaluating the leakage of fluid from high pressure grooves to low pressure grooves through the inter-tooth contact line during operation. Based on the above inter-lobe clearance calculating method, the inter-tooth clearance calculation for the variable lead screw rotor is further proposed. This study also proposed a numerical method for reversely generating a pair of ideal conjugated rotor profiles based on the calculated clearance distribution values, which generates a pair of ideal rotor profiles that does not have inter-lobe clearance in the original design, greatly reducing the processing time before the subsequent tooth profile performance analysis. Subsequently, the measurement of the inter-lobe clearance is performed using CAD modeling method, and the measured results are verified and compared with the previously calculated values to ensure the accuracy of the calculated values.
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