【摘要】：由于壓縮介質(zhì)和應(yīng)用場合的不同，風(fēng)冷無油渦旋空氣壓縮機(jī)有著排氣孔較大、負(fù)修正角雙圓弧修正等結(jié)構(gòu)特點(diǎn)，導(dǎo)致對(duì)稱腔的排氣過程不同步，同時(shí)由于冷卻風(fēng)的影響，空氣壓縮過程和結(jié)構(gòu)的變形變得復(fù)雜。為了給設(shè)計(jì)過程中的關(guān)鍵問題提供理論依據(jù)和具體參考，本論文系統(tǒng)研究了風(fēng)冷無油渦旋空氣壓縮機(jī)的幾何理論、熱力學(xué)、結(jié)構(gòu)溫度場、機(jī)構(gòu)動(dòng)力學(xué)、應(yīng)力分布及結(jié)構(gòu)變形。 根據(jù)邊界曲線的運(yùn)動(dòng)過程及相對(duì)位置關(guān)系，構(gòu)建了風(fēng)冷無油渦旋空氣壓縮機(jī)的幾何模型解析式，初步分析了氣體壓縮過程狀態(tài)的轉(zhuǎn)變，為熱力學(xué)計(jì)算、渦盤溫度場計(jì)算做好準(zhǔn)備。 在幾何數(shù)學(xué)模型的基礎(chǔ)上，基于開口系統(tǒng)熱力學(xué)第一定律、泄露模型、換熱模型，構(gòu)建了風(fēng)冷無油渦旋空氣壓縮機(jī)熱力學(xué)計(jì)算模型，研究了換熱過程的變化規(guī)律，分析了壓縮過程空氣狀態(tài)的變化規(guī)律及主要影響因素，完成了壓縮區(qū)域熱通量的計(jì)算。 通過熱通量計(jì)算，把氣體壓縮時(shí)的動(dòng)態(tài)換熱過程轉(zhuǎn)換為靜態(tài)邊界條件，提出以渦齒溫度線性起始角和動(dòng)定盤壓縮區(qū)域平均溫差為調(diào)整參數(shù)，交替計(jì)算熱力學(xué)過程和渦盤溫度場，得到了與渦齒溫度測量值和熱力學(xué)溫度邊界條件相符的渦盤溫度場計(jì)算結(jié)果，分析了渦齒和散熱區(qū)域溫度分布規(guī)律，同時(shí)對(duì)熱力學(xué)計(jì)算溫度邊界條件進(jìn)行了修正。 構(gòu)建了主要零部件的動(dòng)力學(xué)模型，分析了作用力變化規(guī)律及波動(dòng)情況，，結(jié)合結(jié)構(gòu)溫度場計(jì)算結(jié)果，研究了不同運(yùn)行時(shí)刻結(jié)構(gòu)變形的分布規(guī)律和變化情況，分析了作用力對(duì)結(jié)構(gòu)變形的影響，并對(duì)結(jié)構(gòu)進(jìn)行了強(qiáng)度校核。 根據(jù)裝配關(guān)系，研究了結(jié)構(gòu)變形后壓縮區(qū)域的干涉大小及分布，在避免渦盤碰撞的前提下，以減少泄露為目標(biāo)，提出了渦齒修正方法。
[Abstract]:Because of the difference between the compression medium and the application situation, the air-cooled oil-free scroll air compressor has the characteristics of large exhaust hole, negative correction angle, double circular arc correction and so on, which leads to the non-synchronization of the exhaust process of the symmetrical cavity and the influence of the cooling air. The process of air compression and the deformation of the structure become complicated. In order to provide theoretical basis and specific reference for the key problems in the design process, the geometry theory, thermodynamics, structural temperature field, mechanism dynamics, stress distribution and structural deformation of air-cooled oil-free scroll air compressor are systematically studied in this paper. According to the movement process and relative position relation of the boundary curve, the geometric model of air-cooled oil-free scroll air compressor is established, and the transformation of the state of the gas compression process is analyzed preliminarily, which is a thermodynamic calculation. The temperature field of the vortex disk is ready to be calculated. On the basis of geometric mathematical model, based on the first law of thermodynamics, leakage model and heat transfer model of open air system, the thermodynamic calculation model of air-cooled oil-free scroll air compressor is constructed, and the variation law of heat transfer process is studied. The variation law of air state and the main influencing factors during compression are analyzed, and the calculation of heat flux in compression region is completed. Through heat flux calculation, the dynamic heat transfer process during gas compression is transformed into static boundary condition. The linear starting angle of vortex tooth temperature and the average temperature difference in the compression region of moving disk are used as the adjusting parameters to calculate the thermodynamic process and the vortex temperature field alternately. The calculated results of the vortex disk temperature field in accordance with the measured values of the vortex tooth temperature and the thermodynamic temperature boundary conditions are obtained. The temperature distribution in the vortex tooth and heat dissipation region is analyzed and the thermodynamic calculation temperature boundary conditions are modified at the same time. The dynamic model of main parts is constructed, and the law of force variation and fluctuation are analyzed. The distribution and variation of structural deformation at different running times are studied by combining with the calculation results of structure temperature field. The influence of the force on the deformation of the structure is analyzed, and the strength of the structure is checked. According to the assembly relation, the interference size and distribution of the compression region after the deformation of the structure are studied. In order to reduce the leakage, a vortex tooth correction method is put forward on the premise of avoiding the collision of the vortex disk.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH45

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