新型機械軸封設計:氣體靜壓軸承理論延伸應用至固相聚合反應槽

在固相聚合製程裡，舊式的攪拌機機械軸封轉動產生磨擦，產生像鐵、碳或鐵氟龍等顆粒異物的情形。廠商在製做寶特瓶時，這些磨擦生成物造成困擾，寶特瓶成品有斑點或破孔出現，含氣的飲料注入瓶後，會無法保持壓力及洩漏。光電薄膜用途的酯片，在製作膜片時，會造成斷裂及成形不良。斑點會造成膜片裁切尺寸變小，而增加製造成本。在實驗中，重新設計螺旋進料器的機械軸封結構及傳動方式。直流馬達減速機修改成交流馬達減速機後，提供良好的裝配空間。由於製程皆使用氮氣輸送，並用氮氣保護固相聚合反應，為符合改善的需求及周邊設施的配合，氣體潤滑軸承技術恰巧能與機械軸封應用結合。新設計的軸封，利用壓縮氣體在微小的間隙下產生剛性，來替代傳統機械軸封的止漏面，產生非接觸式軸封的效果，在此稱為氣封面(Gas Face)。在Gas Face式軸封改善下，可達到無異物的污染，酯片在管路輸送中，磨擦生成的粉末或破碎酯片，同時也改善止漏氮氣用的油封容易被破壞的缺點。新軸封減少生產環境的粉塵污染，降低氮氣對人體的危害。在維修及保養人力的花費大幅下降，大量減少庫存備品數量，降低維修對生產的影響。

關鍵字

氣體潤滑軸承；機械軸封

並列摘要

In the solid state polymerization process, the old-type mechanical seal of agitator operation produces some frictional grains or particles, like ion, carbon, Teflon and etc. when the merchant manufactures PET bottles, the frictional grains or particles generated creates defects. The soft drink bottle has spots or broken holes. It can not maintain the pressure of the bottle and may start to leak. For optical film chip manufactures, the frictional grains or particles may result in breakage and worsen forming process is not good. The splits or striped patterns may reduce the diaphragm dinking die size which increases the production cost. In this research, redesign of screw feeder’s seal and driving mechanism were accomplished. After changing direct current motor gear reducer into alternating current motor gear reducer, it provides a good assembly space. Because of system regulation, nitrogen is used to transport chips and solid polymerization, and to protect the reaction of solid state polymerization process. In order to conform to the improvement requirement and to coordinate related equipments, gas lubrication bearing technology is applied in association with mechanical seal. The new design seal use compression gas to create the rigidity under the small gap. It substitutes traditional mechanical seal in stopping leakage at the surface. It has the effect of non-contact type of mechanical seal. It is called Gas-Face in this study. With the improvement of the Gas-Face type mechanical seal. There is no contamination of frictional grains or particles. Rubbing of the chips in the pipeline which produces powder and the broken ester piece is greatly reduced. It also improves life span of the oil seals which stops nitrogen leakage. The new-type mechanical seal reduces dust pollution to the environment and reduces the harming of nitrogen to human body. It also significantly cut down service requirement and the maintenance expenditure. It reduces the massive stocks of spare parts and the interruption of maintenance work to the production.