| Impurities in hydraulic oil do serious damage in hydraulic system, particularly in deep sea hydraulic system. As a result, it is very important to do research in reducing pollution effectively in hydraulic oil of deep sea hydraulic system. This thesis introduces a design of oiling device which can improve the safety and reliability of the deep sea hydraulic system it equipped with.For hydraulic system, there are mainly three types of oil pollution:air pollution, water pollution and solid particle pollution. Current oil filter can solve these problems to some extent, but cannot avoid the contact between air and oil after oiling, which shall cause the secondary pollution of the oil. When deep sea hydraulic system is oiling, the rudimental air in the pipe also cannot be discharged totally, which will cause pollution of hydraulic oil. With respect to this current situation, this thesis introduces a kind of oiling system that can solve the problems above effectively. This device can firstly purify the oil by filtering, water removal and degassing, then it proceeds with vacuum oiling, which effectively prevent the hydraulic oil from contacting the air, which will cause the secondary pollution. Meanwhile, in the process of oiling, pumping out rudimentary air in deep sea hydraulic system is a good method to guarantee the purification of the oil. After vacuum oiling, the hydraulic system should be oiled in high pressure. In this process where positive pressure is added to prevent sea water from penetrating the cell of system, which will ensure pressure equalizer in deep sea hydraulic system work properly and safely.In the beginning, the thesis introduces theoretical base of this oiling system in a deep sea hydraulic system. Then it elaborates the design of the overall system in detail. After confirming the design scheme, a schematic diagram is rendered. Meanwhile, considering the particular need of deep sea hydraulic system, the structural design of special oiling device in deep sea hydraulic system is elaborated exhaustively. Thesis also includes type selection, calculation and theoretical check of electric heater, liquid thermometer, air cleaner, hydraulic pump, and vacuum pump. At last,3D modeling of the device is established in SolidWorks simulation software, where assembly simulation is also made.According to design scheme of this device, we finish manufacturing a prototype. The system test indicates that this device can satisfy the given needs. The research of this thesis establishes the theoretical base and practical experience of oiling in deep sea hydraulic system. |
