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八十年代初,我们将凝聚釜(凝聚顺丁橡胶胶液为固态胶粒的设备)搅拌轴上所用的填料密封,改为双端面机械密封(如图),因而,克服了釜内汽态溶剂油和蒸汽沿搅拌轴向釜外的泄漏。但是,这种机械密封需经常补充循环使用的封液(杭州炼油厂产的白油,每吨3000元),耗资大,经济不合算,有时还有部分封液窜入釜内,影响产品产量。
In the early 1980s, we changed the packing seal used on the agitator shaft of the converging kettle (equipment for condensing butadiene rubber cement into solid rubber) to a double-ended mechanical seal (pictured), thus overcoming the vapor phase in the autoclave Leakage of solvent oil and steam outside the autoclave along the agitator shaft. However, this type of mechanical seal needs to be replenished frequently with the circulating liquid seal (the white oil produced in Hangzhou refinery is 3,000 yuan per ton), which is costly and economically uneconomic. In some cases, some sealings flee into the autoclave and affect the product yield .