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本文探讨了螺旋密封的设计方法。首次将该密封形式应用于甘肃巴家嘴水电站２＃机Ａ４３０转轮下止漏环的设计中。试验结果表明抗磨蚀效果显著。巴家嘴水电站年均含沙量为１９０ｋｇ／ｍ３，最大含沙量为１２００ｋｇ／ｍ３。在水头Ｈ＝３２ｍ转轮出口相对流速Ｗ＝１７ｍ／ｓ条件下，原转轮在浑水期运行４５天后，转轮上下迷宫环密封全部磨平，效率下降到６５％［１］。而采用螺旋密封形式的Ａ４３０转轮下止漏环经过两年多运行检查未发现磨蚀（图１）。由此可见，这种从尖端技术领域发展来的密封形式将在水轮机密封领域有着广阔的应用前景。
This article explores the design of spiral seals. For the first time, the seal was applied to the design of the under-leakage grinder of A430 runner of No.2 machine at Baziazui Hydropower Station in Gansu Province. The test results show that the anti-erosion effect is significant. The annual average sediment concentration of Baziazui Hydropower Station is 190kg / m3 and the maximum sediment concentration is 1200kg / m3. Under the condition of relative flow velocity W = 17m / s at the outlet of the head H = 32m, the labyrinth ring seal on the runner is completely polished and the efficiency is reduced to 65% after running for 45 days in the muddy water period [1]. The A430 runner under the leak-tight ring in the form of a spiral seal after two years of running inspection found no abrasion (Figure 1). Thus, this form of sealing technology developed from cutting-edge technology will have broad application prospects in the field of turbine seals.