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Title: | 微型液力耦合器之設計與開發 Design and Development of Mini Hydraulic Coupling |
Authors: | Meng-Ru Wu 吳孟儒 |
Advisor: | 黃光裕(Kuang-Yuh Huang) |
Keyword: | 液力耦合器,動力傳輸,微型化,渦輪葉輪,有限元素分析, Hydraulic coupling,Power transmission,Minimization,Vane wheel,Finite element analysis, |
Publication Year : | 2013 |
Degree: | 碩士 |
Abstract: | 液力耦合器為透過一體介質傳遞動能之傳動機構,具有傳動平穩與過負載保護等優點,已被廣泛運用於船舶、鐵路車輛與重工業。若能縮小液力耦合器之尺寸,並應用於小型精密機械中,可使精密機械於高轉速運轉時之動力傳輸穩定、降低衝擊振動之影響、抑制噪音的生成,進而使得機械運轉更為精密。
本論文目標為設計開發微型液力耦合器以及性能量測裝置。依據液力耦合器原理,輸入耦合器之機械動能將透過泵輪轉成液體動能,帶動液體介質後衝擊渦輪,渦輪再將液體動能轉回轉速和扭力矩輸出。為應用於精密小型機械中,微型液力耦合器之外型尺寸與元件之轉動慣量皆必須有所限制。 微型液力耦合器的性能主要受到液體性質,以及泵輪和渦輪的葉輪外型與結構等流體力學特性影響。考慮到低汙染與醫學運用,水因其低黏滯性和中性性質被選用為動力傳輸媒介。透過理論和有限元素分析探討微型液力耦合器的影響因素和性能之關係以及能量轉換效能之關係。在液體性質不受轉速影響的假設下,微型液力耦合器在輸入轉速2000 rpm時開始啟動耦合效應。 本論文進一步製作微型液力耦合器之實體模型並進行實驗,以了解葉扇角度及葉輪間距對耦合性能的影響。根據實驗結果,葉輪間距和葉扇角度直接影響渦輪輸出扭矩,當葉輪間距越小,輸出扭矩越大,而葉扇角度越接近 時可以產生最大輸出扭矩7 。渦輪輸出速度卻不受葉輪間距和葉扇角度的影響。 The hydraulic couplings, which transmit energy through fluid working medium, have been broadly used in marine vessels, railway vehicles, and heavy machines. Because of its design concept of non-contact energy transmission and fluidic properties of fluid working medium, the hydraulic couplings have advantages such as better vibration absorption and overload protection. With these advantages, the mini hydraulic coupling can be applied on small machines to stabilize the power transmission, to reduce the influence of impact vibration, and to suppress the noise. This will improve the precision of small machines during high speed operation. The purpose of this thesis is to design and develop a mini hydraulic coupling along with its performance verification equipment. Based on the hydraulic coupling principle, the mechanical input energy is transformed by the pump impeller into the fluidic kinetic energy of fluid working medium, and then creates the fluid motion. The turbine wheel turns the fluidic kinetic energy into the mechanical energy after being directly lashed by moving fluid. With a view to applying to small precision machines, the dimensions and rotational inertias of mini hydraulic coupling should be limited. The performance of the mini hydraulic coupling is significantly influenced by the fluid properties of fluid working medium and the fluid dynamic properties of the pump and turbine wheels, such as shape and structure. In consideration of kinetic motions, medical application and pollution prevention, water is chosen as the fluid working medium because of its low viscosity and stable properties. Though the theoretical and finite element analyses, the relationship between the design parameters and the performance such as energy transformation efficiency are closely studied. Under the the assumption that fluid properties are unaffected by speed, the designed mini hydraulic coupling can start its coupling operation at the rotational speed of 2000 rpm. The prototype of the mini hydraulic coupling has been developed based on the analytical results. The experimental measurement has also been carried out to verify the relationship between the design parameter, such as vane angle and wheel span, and the performance of the mini hydraulic coupling. The results show that the wheel spans and vane angle both have direct influence on the turbine torque. The output torque will increase while the wheel span decreases, and there is a maximum torque output of 7 for the vane angle near . The output speed has no significant affiliation with these two design parameters. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61480 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 機械工程學系 |
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ntu-102-1.pdf Restricted Access | 2.55 MB | Adobe PDF |
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