【正文】 吸氣類似，排氣設(shè)在機體的頂部，采用徑向排氣。噴油螺桿壓縮機的機體采用單層壁結(jié)構(gòu)。轉(zhuǎn)子包含在機體中，機體的外側(cè)即為大氣。為給進(jìn)氣和排氣留下氣體流動的空間，機體需向外做必要的延伸。機體材料為灰口鑄鐵，牌號為HT200。轉(zhuǎn)子是螺桿壓縮機的主要零件，由于轉(zhuǎn)子直徑較小，其結(jié)構(gòu)采用整體式。對螺旋狀工作段以外的部分，按通常的“轉(zhuǎn)軸”要求進(jìn)行設(shè)計。螺桿壓縮機轉(zhuǎn)子的毛坯常為鍛件，采用球墨鑄鐵，其牌號為QT6003，既便于加工，又降低了成本。在螺桿空氣壓縮機中，由于軸向力和徑向力都不大，故都采用滾動軸承。采用深溝球滾動軸承，型號為6006，既能承受軸向載荷，也能承受徑向載荷。軸承采用脂潤滑。噴油螺桿空氣壓縮機都采用滾動軸承，為了防止壓縮腔的氣體通過轉(zhuǎn)子軸向外泄漏，必須在排氣端的轉(zhuǎn)子工作段與軸承之間加一個軸封。在螺桿壓縮機正常工作時，吸入端的轉(zhuǎn)子工作段與軸承之間幾乎沒有壓差，所以，在吸氣端的轉(zhuǎn)子加工段與軸承之間，只用間隙密封就能滿足要求，沒有必要再提供密封油。在小型壓縮機中，通常采用簡單的唇型密封。第三章 雙螺桿壓縮機的熱力學(xué)和功率計算螺桿壓縮機的熱力學(xué)計算的目的，是為了求出在壓縮過程中壓力和溫度的變化，并由其結(jié)果算出機器所需要的功率。此外至少還必須近似地求出壓縮機的容積效率。在螺桿壓縮機的設(shè)計計算中，對于大部分所輸送的工質(zhì)的壓力和溫度變化與理想氣體相同。螺桿壓縮機齒槽內(nèi)的實際的熱力學(xué)過程十分復(fù)雜，在理論上還不能準(zhǔn)確地掌握的。因此，在熱力學(xué)計算上只能采用十分簡化的模型，于是得出的結(jié)果只能近似地接近實際。 （31）查表2312，得單邊不對稱擺線銷齒圓弧型線的扭角系數(shù)為Cj =。它決定壓縮機的排氣孔口位置，其定義為 （32）氣體的壓縮過程終止于第Ⅱ階段，則 （33） （34）做近似計算，氣體的壓縮過程終止于第Ⅱ階段，則 （35）將上式代入式（33）及式（34），得 （36） （37）則 （38）若壓縮氣體視為理想氣體，則內(nèi)壓力比可用下式近似計算： （39）式中，pt = (表壓)為內(nèi)壓縮終了的壓力； = (大氣壓),為吸氣終了壓力；Vt為壓縮過程結(jié)束時的容積值；Vo為吸氣過程結(jié)束時的容積值；為壓縮機的內(nèi)容積比；m為多方壓縮過程指數(shù)。將已知數(shù)據(jù)代入上式得： =（1） 指示功率Pi Pi= （310)W為指示功，n為壓縮機轉(zhuǎn)速,n=3000r/min。 軸功率 （311）ηm為機械效率，一般ηm =，取ηm =。 螺桿壓縮機的絕熱效率ηad反映了壓縮機能量利用的完善程度，其數(shù)值依機型和工況不同而有明顯的差別。據(jù)圖2350，Pd=, 取絕熱效率had=。 （312）采用增速齒輪傳動，其傳動效率ht=，取ht=。一般電動機功率均滿足選配大于軸功率，電動機動余度為：xd=，取xd=，電動機功率 （313）本設(shè)計采用封閉式三相交流異步鼠籠式電動機，其型號為Y280S2，電動機軸直徑D=65mm其轉(zhuǎn)速n=3000r/min，其效率hd=，則電能總消耗為： (KW) （314）第4章 雙螺桿壓縮機的proe主要零件圖、組裝圖和仿真圖1. 主要零件圖（1） 陰螺桿，左旋，齒數(shù)為6，螺桿長度為135mm，與陽螺桿嚙合傳動。（2） 陽螺桿，右旋，齒數(shù)為4，螺桿長度為135mm,與陰螺桿嚙合傳（3）壓縮箱主體，內(nèi)側(cè)長137mm，,厚度40mm(4)排氣蓋，底板塊剛好封住壓縮箱主體。（5）吸氣端蓋，底板與壓縮箱主體剛好封住。（6）吸氣端封蓋。（7）滾動軸承1.（8）滾動軸承2.（9）排氣端封蓋1.（10）排氣端封蓋2.2. 組裝圖（1）陰陽螺桿嚙合傳動圖（2） 總組裝圖覽3. 仿真圖（1） 陰陽螺桿嚙合連接圖（2）速度為常數(shù)時候的仿真曲線，加速度為0，位置隨時間均勻變化。（3）速度為線性時候的仿真曲線，速度均勻變化，加速度為常數(shù)。（4）速度正弦函數(shù)變化，位置和加速度呈不規(guī)則變化。中英文翻譯The screw air pressor Screw air pressor is the injection of single stage double screw pressor, divided into single screw air pressor and screw air pressor, efficient use of belt drive, drive the host rotation of pressed air, through the oil for cooling the pressed air in the host, the host of air and oil discharge of the mixed gas after coarse, fine two channel separation, the pressed oil separated out in the air, finally get the clean pressed air. Cooler for cooling the pressed air and oil. With reliable performance, small vibration, low noise, convenient operation, few wearing parts, high efficiency is the biggest advantage of. Screw pressor is a new type pressor, air is pressed alveolar ridge volume change installed on the casing are mutually parallel rotor meshing and achieve. The rotor side in the case and it with precision internal rotation so that gas rotor slot between continuously cyclical changes in volume and along the rotor axis, by the suction side to the discharge side suction, pression, exhaust, plete three working process. Twin screw pressor is a double volume type rotary pressor, which is the main (Yang) side (Yin) with two rotor, posed of meshing pair, vice principal of rotor profile of external ponents of the element volume closed with the inner wall of the casing, shortage of twin screw is 40 cubic meters and above machine type to add gear, increase power consumption and prone to head lock。 while the worm pressor is a uniaxial volume type rotary pressor, the meshing pair is posed of a worm wheel and two symmetrical layout, wall by the worm screw groove and the star wheel tooth surface and the casing form element volume closed, but the problem is the Star blade material has yet to be improved. The main performance parameters of screw type air pressor power, volume flow rate, pressure, exit temperature, discharge pressure and speed etc.. And in the design of screw air pressor, rotor of a pair of mutually meshing is a very important parameter. Because the performance of the pressor is closely related with the. The Yin and Yang of screw pressor rotor can be regarded as a pair of mutually meshed helical gear, therefore, the Yin and Yang of screw pressor rotor profile, but also to meet the meshing law. Rotor tooth surface and the vertical axis of the rotor section called rotor profile. The rotor profile of screw pressor is divided into symmetric and asymmetric line profile, and unilateral and bilateral type line profile, tooth top center line on both sides of the line are identical, called the symmetric line. On the contrary, the tooth top center line on both sides of the line is not at the same time, called asymmetric line. Only one side has a line in the internal or external rotor pitch circle, called single line. Pitch circle, are stylish lines, called bilateral profile. Generally speaking, the development and design of new line directly affect the performance of screw air pressor, design of screw air pressor performance also depends on the type of line. Screw pressor is constantly engaged on the rotor output pressed gas, therefore the spindle speed variation, volume flow rate, the exhaust pressure of the pressor will be affected, so the spindle speed is a major factor affecting the performance of screw pressor. When the exhaust pressure increases, pressor power consumption also increases, power increases, the decrease of economic benefit, so it has significant effect on energy consumption and exhaust pressure of the pressor. At the same time, some test results show that the external environment temperature will influence the performance of screw pressor. China in different seasons and different regions of the temperature difference, air temperature and ambient temperature of pressor is different, this parameter will directly affect the performance of screw pressor. Therefore, the factors that influence the performance of screw pressor were analyzed, will have the very big help to use screw pressor. Screw pressor body is divided into two kinds, one kind is the belt transmission