汽轮机油挡正压密封设计

Positive pressure sealing design of oil baffle in turbine

为了防止汽轮机润滑油中带水以及油挡漏油,可向汽轮机各轴瓦油挡空腔室内输送干净压缩空气,使腔室内的压缩空气向大气和油室两侧流动,密封住了润滑油向外流动和蒸汽向油室流动。通过详细计算各油挡所需压缩空气量、各瓦油挡的流体阻力以及回气管道的阻力,得出了各瓦油挡入口、出口调整阀的压力值。杜绝了汽轮机轴瓦油挡漏油和油室中进水,保证了汽轮机长周期安全运行,同时也节约了大量人力物力。

To prevent water to be entrapped in the lubrication oil and the oil to leak out from the oil baffle of steam turbine, the clean compressed air can be injected into oil baffle cavity of each bearing shell of the turbine, which flow in both direction of outer space and oil housing, preventing the oil to leak out and the steam to flow into the oil housing. The pressures of the compressed air of the adjustment valves at the inlet and outlet of each bearing shell were determined bv detailed cah ulation of the compressed air flow needed for each bearing shell, the fluid resistance of each bearing shell and the resistance of baekair pipe. The oil leakage from the oil baffles and entrapped water into the oil housings of the beating shells were eliminated, the safety operation of turbine in tong period was ensured, and a lot of labor forces and material resources were saved due to adopting above mentioned measures.