循環氣體負載下雙螺桿壓縮機之轉子幾何特徵對動力特性之探討

Study of Rotor Geometry and Dynamics Characteristics for Twin-Screw Compressors under Cyclic Gas Load

范崇文(Chung-Wen Fan)

指導教授 ： 吳育仁

國立屏東科技大學/工學院/機械工程系所/碩士(2014年)

https://doi.org/10.6346/NPUST.2014.00275

摘要

雙螺桿壓縮機內部一對相互嚙合運轉之螺旋公、母轉子，是重要核心元件，運轉時會受到循環氣體負載而造成轉子齒面變形、氣體洩漏及功率損耗，此部份的設計是影響壓縮機效能之關鍵。本研究主要基於多體動力學原理，利用MSC.ADAMS軟體建立雙螺桿壓縮機之轉子對及軸承系統，並施予公、母轉子所受之循環氣體力矩，而氣體力矩所需的幾何特徵計算本研究於國科會整合型計畫中建立完成，將該資料與同計畫下的熱力性能模擬及轉子受力分析數值計算模組串聯，可方便變更分析模型中之幾何或工況設計參數，更可快速得知轉子幾何資料及負載資料。本研究首先提出一應用實例，選取某公司之冷媒式壓縮機型，進行具有氣體力矩之轉子CAE模型建立，並將結果與實際量測之振動頻譜進行比對。最後提出三組模型，變更原始模型之幾何特徵，探討更多循環氣體負載下幾何對於轉子的影響，並且由最後比對結果得知模擬之嚙合力頻譜特徵與實驗量測所得之振動頻譜特徵具有相近之趨勢。

關鍵字

雙螺桿壓縮機 ； 循環氣體負載 ； ADAMS ； 轉子幾何 ； 動力特性

並列摘要

The pair of meshing male rotor and female rotor is the core component operating inside the Twin-screw Compressor. During operation, cyclic gas load will cause rotor deformation, gas leak and power consumption of the rotor. The design of meshing rotor is crucial in the performance of compressor. Based on Multibody Dynamics theory, this study aims to design the meshing rotor and Bearing System for the Twin-screw Compressor using MSD.ADAMS software. In this study, the gas torque of meshing rotor is taking into consideration. The geometry characteristics of the needed gas torque were established in the Integrated Research Programs, National Science Council. In order to rapidly obtain the geometry and load data of meshing rotor, this study integrated Thermal Performance Simulation, Stress Analysis of meshing rotor and Numerical Analysis to facilitate the modification of the geometrical and working condition parameter in the model. This is the first study applying industrial case by using commercial Refrigerant Screw Compressor to establish the CAE model of meshing rotor with the gas torque data. The result is compared with the frequency spectrum of vibration’ s actual measurement to establish an original model. In order to further explore the effect of cyclic gas load on meshing rotor, three models were developed according to the modified geometry characteristics of original model. The result suggests the characteristics of simulated frequency spectrum of contact force and the characteristics of measured frequency spectrum of vibration have the tendency to be resembled.

並列關鍵字

Twin screw compressor ； cyclic gas load ； ADAMS ； geometry of rotors ； Dynamic characteristics

參考文獻

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