An Experimental Study of Static and Dynamic Characteristics for Annular Plain Seals with Porous Materials

多孔材料环形滑动密封静动态特性实验研究

• 批准号: 03650126
• 负责人: KANEKO Satoru
• 金额: $ 1.34万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650126/
• 关键词: Annular Plain Seals; Damper Seals; Porous Seals; Friction Loss Coefficient; Inlet-pressure Loss Coefficient; Leakage Flow; Reaction-force Components; Dynamic Coefficients; 環状シ-ル; もれ流量

The static and dynamic characteristics are experimentally investigated for three types of damper seals with round-hole pattern and a plain seal with sintered metal bush. The damper seals consist of an inner perforated ring of 0.5mm thickness (SUS304) having about 3800 round holes of 0.4mm diameter at intervals of 2mm and a bush (SUS304) holding the ring. These holes lie in the axial plain, and are made perpendicularly to the inner surface (radial direction) for damper seal 1, from the 60 degrees direction to one for damper seal 2 and from the 30 degrees direction for damper seal 3. The other type of seal (porous seal) has the sintered metal bush which is inserted into the inlet part of the seal, and consequently, the seal surface consists of two different materials: solid (SUS304) and sintered metal (SUS304).The results of this test program support the following conclusions.A comparison of the damper seals and the ordinary solid annular plain seal shows that the damper seals take higher values of the friction loss coefficient lambda and the nominal inlet-pressure loss coefficient xi , and smaller leakage flow Q than the solid seal. The value of lambda becomes higher and Q smaller in order of the solid seal, damper seal 1, damper seal 2 and damper seal 3. Furthermore, the tangential fluid forces for damper seal 2 and3 are reduced, which facilitate the backward whirling motion and lead to a high stable operation at relatively high rotational speed as compared to that for the other seals.On the other hand, it is observed that the quantitative difference of performance characteristics between the porous seal and the solid seal is insignificant. This fact is ascribed to the reduction in the hydrostatic force induced by the sintered metal owing to higher clearance ratio.

对三种类型的圆孔阻尼密封件和烧结金属衬套滑动密封件的静态和动态特性进行了实验研究。阻尼密封件由厚度为 0.5 毫米的内部穿孔环（SUS304）和固定该环的衬套（SUS304）组成，该内部穿孔环具有约 3800 个直径为 0.4 毫米、间隔为 2 毫米的圆孔。这些孔位于轴向平面上，对于阻尼密封件 1，这些孔垂直于内表面（径向）；对于阻尼密封件 2，这些孔从 60 度方向向内表面开孔；对于阻尼密封件 3，这些孔从 30 度方向向内表面（径向）开孔。密封件（多孔密封件）具有插入密封件入口部分的烧结金属衬套，因此密封面由两种不同的材料组成：实心（SUS304）和烧结金属(SUS304)。该测试程序的结果支持以下结论。阻尼密封件与普通实心环形滑动密封件的比较表明，阻尼密封件的摩擦损失系数 lambda 和名义入口压力损失系数取较高值xi ，泄漏流量Q比固体密封小。按固体密封、阻尼密封件1、阻尼密封件2、阻尼密封件3的顺序，λ值变大，Q变小。此外，阻尼密封件2和3的切向流体力减小，有利于向后旋动运动，并导致与其他密封件相比，能够在相对高的转速下实现高度稳定的操作。另一方面，观察到多孔密封件和固体密封件之间的性能特征的定量差异是微不足道的。这一事实归因于由于较高的间隙比而导致由烧结金属引起的流体静力的减小。