vacuumpump真空泵ppt課件-展示頁
2025-05-14 18:28本頁面
【正文】 itted a rotor. The rotor turns, the tips of the blades are in contact with the stator wall at all times. Four stages in one revolution of the rotor are induction, isolation, pression and exhaust phases. 05/10/2022 Title 10 Mineral oils are the most monly used fluids for rotary pumps. In general, oils available from a garage service station or store do not have a suitable low vapour pressure and none exhibit the service life or low level of back migration required for most process. Mineral oils offered by vacuum pump manufactures and other suppliers have been distilled to remove volatile ponents. The cross section of rotary vane pump Schematic of a rotary vane pump Rotary vane pump 05/10/2022 Title 11 Cross section of rotary pump Image of rotary pump and parts Rotary vane pump 05/10/2022 Title 12 05/10/2022 Title 13 Two stage rotary pump 05/10/2022 Title 14 ? constitute 組成 ?stator , 固定片 ? eccentric rotor ? vane/blade ：閥片 ? diametral ? slot , 狹槽 ? cylinder ? tubulation ? dust filter 濾網(wǎng) ? arrester plate: 鎖定平板 ? sheet of neoprene （條） ? hinge 鉸鏈 ? backing sleet 擋板 ? driving shaft 驅(qū)動(dòng)軸 ? clearance 間隙 ? sliding fit: 滑動(dòng)配合 ? spring 彈簧 rotatingvane pump/rotary pump 05/10/2022 Title 15 ? rounded end ? submerge ? top seal 頂端密封 ? exhaust valve 排氣閥 ? intake 吸入量 cavity 空腔 ? volume rate ? pump displacement: 排氣量 ? abrasive material: 腐蝕性材料 ? dead volume: 余隙容積，有害空間 ? re 又，再 ? discharge 排出 ? pression ratio: 壓縮比 ?the main function of the oil: lubrication sealing filling the dead volume ? permanent gas total /partial gas ? Mcleod / pirani gauge reading 讀數(shù) ? Parallel/series connection 并 /串連 dead volume 05/10/2022 Title 16 ? Pumping speed curves ? fall off 下降 ? noticeable obvious ? gas ballast 氣鎮(zhèn) ? condensible 縮 (凝縮 )的 ? contaminate vt. 污染 ? evaporatecondense 05/10/2022 Title 17 Gas ballast 1) Pump is connected to the vessel, which is already almost empty of air (70 mbar) – it must thus transport mostly vapor particles 2) Pump chamber is separated from the vessel – pression begins 3) Content of pump chamber is already so far pressed that the vapor condenses to form droplets – overpressure is not yet Reached 4) Residual air only now produces the required overpressure and opens the discharge valve, but the vapor has already condensed and the droplets are precipitated in the pump. Without gas ballast 05/10/2022 Title 18 Gas ballast 1) Pump is connected to the vessel, which is already almost empty of air (70 mbar) – it must thus transport mostly vapor particles 2) Pump chamber is separated from the vessel – now the gas ballast valve, through which the pump chamber is filled with additional air from outside, opens – this additional air is called gas ballast 3) Discharge valve is pressed open, and particles of vapor and gas
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