本文選題：氣動馬達 + 配氣系統(tǒng)　； 參考：《內(nèi)蒙古工業(yè)大學(xué)》2017年碩士論文

【摘要】：搭載活塞式氣動馬達的絞車是能源開采和生產(chǎn)制造領(lǐng)域不可替代的輸送裝置,其工作效率和設(shè)備安全性對于工業(yè)生產(chǎn)有著重要意義。目前新型配氣系統(tǒng)在配氣效率上有了很大提升,提高了氣動馬達做功功率。但目前馬達與配氣系統(tǒng)依然存在諸多問題,主氣道氣體能量損耗較大。新型配氣系統(tǒng)內(nèi)部氣體流動狀態(tài)無法準確得到,影響了輔助氣動回路的設(shè)計,導(dǎo)致輔助氣控系統(tǒng)的可靠性較差。因此,需要深入分析配氣裝置和氣缸內(nèi)氣體流動特性,優(yōu)化匹配馬達和配氣裝置,提高整機工作效率。論文針對XJFH-5×135型活塞式氣動馬達及其新型配氣系統(tǒng),以馬達動力性和經(jīng)濟性為目標函數(shù),利用CFD數(shù)值模擬開展馬達與配氣裝置的優(yōu)化匹配研究。首先,分析了新型配氣系統(tǒng)的組成結(jié)構(gòu)以及氣動控制原理,研究影響氣動馬達性能的設(shè)計參數(shù),通過理論分析找到影響馬達缸內(nèi)壓力的因素。其次,應(yīng)用滑移網(wǎng)格和動網(wǎng)格技術(shù)模擬分配閥芯旋轉(zhuǎn)運動和活塞往復(fù)運動,在模擬活塞運動過程中,同時應(yīng)用了In-cylinder模型和Fluent函數(shù)自定義功能,實現(xiàn)了分配閥與五個活塞同步動態(tài)模擬分析。通過Fluent軟件針對某種工況下的整機模型進行計算,并利用現(xiàn)有氣動馬達及配氣系統(tǒng)性能測試平臺對馬達與配氣系統(tǒng)的仿真模型進行了有效性驗證,實驗結(jié)果證明了仿真的可靠性。最后,針對不同的關(guān)鍵結(jié)構(gòu)參數(shù)建立了多種仿真模型,對各模型對應(yīng)的氣體壓力能損失情況和缸內(nèi)氣壓值進行了分析和對比,確定了馬達及配氣系統(tǒng)結(jié)構(gòu)優(yōu)化與匹配方案。并且針對優(yōu)化前后的整機性能進行仿真對比分析,優(yōu)化匹配之后馬達動力性和經(jīng)濟性有了明顯提高。通過數(shù)值模擬方法對馬達及配氣系統(tǒng)的優(yōu)化匹配進行研究,依據(jù)仿真得到的內(nèi)部氣道氣動特性,對造成能量損失較大的關(guān)鍵結(jié)構(gòu)進行優(yōu)化,通過氣體流動特性和能量傳遞對分配閥與馬達進行匹配研究。研究得到的內(nèi)部氣道壓力值對于輔助氣控系統(tǒng)的優(yōu)化設(shè)計具有重要指導(dǎo)意義。
[Abstract]:The winch with piston pneumatic motor is an irreplaceable transport device in the field of energy exploitation and production and manufacture. Its working efficiency and equipment safety are of great significance to industrial production. At present, the new valve distribution system has greatly improved the gas distribution efficiency and improved the work power of the pneumatic motor. However, there are still many problems in motor and valve system. The gas flow state in the new gas distribution system can not be accurately obtained, which affects the design of the auxiliary pneumatic loop and leads to the poor reliability of the auxiliary gas control system. Therefore, it is necessary to analyze the gas flow characteristics of the valve distribution device and cylinder, optimize the matching motor and the valve distribution device, and improve the working efficiency of the whole machine. Aiming at the XJFH-5 脳 135 piston pneumatic motor and its new valve distribution system, the optimization and matching of the motor and the valve distribution device are carried out by using the CFD numerical simulation, taking the motor's power and economy as the objective function. Firstly, the structure of the new valve system and the pneumatic control principle are analyzed, and the design parameters that affect the performance of the pneumatic motor are studied. The factors affecting the pressure in the cylinder of the motor are found through theoretical analysis. Secondly, the sliding mesh and moving grid are used to simulate the rotating movement of the valve core and the reciprocating movement of the piston. In the process of simulating the piston movement, the In-cylinder model and the Fluent function are used to customize the function. The synchronous dynamic simulation analysis between the distribution valve and the five pistons is realized. The simulation model of the motor and the valve distribution system is validated by using the existing pneumatic motor and valve distribution system performance test platform through the calculation of the whole machine model under a certain working condition by Fluent software, and the validity of the simulation model of the motor and the valve distribution system is verified. The experimental results show the reliability of the simulation. Finally, a variety of simulation models are established for different key structural parameters. The loss of gas pressure energy and the value of gas pressure in cylinder are analyzed and compared, and the optimization and matching scheme of the structure of motor and valve distribution system are determined. The performance of the motor before and after the optimization is compared and analyzed, and the motor performance and economy are improved obviously after the optimization and matching. The optimization and matching of motor and valve system are studied by numerical simulation method. According to the aerodynamic characteristics of internal air passage, the key structures which cause large energy loss are optimized. The matching between distribution valve and motor was studied by gas flow characteristics and energy transfer. The internal airway pressure obtained from the study is of great significance for the optimization design of the auxiliary gas control system.
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH138.51

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