气隔式油脂密封下部卸油装置

Bottom Unloading Device with Air Seperated Grease Sealing

国内目前铁路油罐车轻质油品的装卸多数采用上装上卸式,此方式存在许多难以解决的问题,如气阻、蒸发损耗超标准、操作程序复杂、劳动量大、不安全等。为此,设计了气隔式油脂密封下部卸油装置。它是由密封活塞、传动机构和活塞缸组成。密封活塞又和活塞缸共同组成油脂室和空气室。油脂室内装满密封油脂,两端由密封圈密封,空气室则把油品与油脂隔绝开来。该装置与阀门相比有五个特点:1.宏观密封环密封介质,封密环的宽度及其上的反力是可调的。2.密封材料是油脂与聚合物的组合,既有硬度又有良好的填充性。3.由密封活塞来密封介质,密封活塞上有油脂室和空气室,通过绝对密封空气室内的空气来达到绝对密封油品的目的。4.使用中不需进行检修,只需调整油脂室内压力和油脂高度。5.只适用于压力低的环境。

Loading and unloading from the top of a light oil rail tank has been the main method in China so far. There remained many problems difficult to solve such as air lock, vapor loss higher than the standarized, complex operating procedures, too much labour involved and being less safe. etc. To solve the problems, a bottom unloading device is designed which is of air-seperation type with grease as its sealing material. The device is made up of a sealing piston, an actuator, and a piston cylinder. Both the sealing piston and its cylinder form the grease chamber and the air chamber. The latter is filled with grease, both ends are sealed with sealing rings. The air chamber seperates the product oil from grease. Compared with a valve, this device has the following five characteristics: 1. Generally, the sealing rings, medium being sealed,the width of the rings and the reaction force acted on them can be regulated. 2. The sealing material is composed of grease and polymer, not only stiff but also good for filling. 3. The medium is sealed with the sealing piston on which there are both a grease chamber and an air chamber. The product can be fully sealed by means of absolute sealing of the air in the air chamber. 4. No maintenance is necessary during application except regulating the pressure and grease level in the grease chamber. 5. This device is suitable only for low temperature environment.