共查询到18条相似文献,搜索用时 89 毫秒
1.
针对螺旋密封中的“气吞”等现象,运用“演化”的思路,对其产生的机理进行了分析。指出螺旋密封实际上是一种具有复使用的机械装置,就是说,它存在一临界值,在临界值以下,是一种螺旋输送装置;在临界值以上,是一种具有轴变容积式吸排型的“零流量”的泵。而螺旋密封中的“气吞”现象是该密封装置的所特有的。同时指出,螺旋密封与四杆人有“亲缘关系”即螺旋 四杆机构演化的结果。 相似文献
2.
3.
本文叙述了螺旋密封的性能特点,尤其对螺旋密封失效的主要原因进行了详细的分析,随后考虑了实际使用限,提出了扩大使用限的实用措施,有一定的参考价值. 相似文献
4.
5.
针对离心式水泵填料密封存在的不足之处,通过对螺旋-填料组合密封的原理及方案分析,改进了离心泵的密封结构。取得了良好的密封效果及经济效益。 相似文献
6.
造粒机辊轮密封失效原因的分析 总被引:1,自引:1,他引:1
分析了密封结构、工作介质、粉体静压力对辊轮组合密封的影响,讨论了组合密封中迷宫密封与唇型密封的失效原因,给出了改进的措施及方法.静压力使得粉体物料进入阶梯型迷宫密封形成堆积,并堆积到唇型密封圈的"唇口"而形成内外压力差,当压力差超过设计压力差时,唇型密封圈失效;工作介质的腐蚀性使密封面、静轴和环型螺旋弹簧严重锈蚀,导致辊轮的密封失效.通过改变阶梯型迷宫密封的结构,增大密封压力,提高密封面、静轴和环型螺旋弹簧的耐蚀性能以及改进布料器的设计等可延长辊轮组合密封的寿命. 相似文献
7.
8.
10.
泵轴封采用的密封方法除最常见的填料密封外通常有机械密封、动力密封、迷宫密封。这些密封方法都是成熟的、可靠的,但实际应用起来却并非那么令人满意,原因何在?让我们作一简析。填料密封此处不再赘述。 相似文献
11.
12.
锯齿型径向迷宫密封机理研究 总被引:1,自引:0,他引:1
采用模型实验和数值模拟的方法,对锯齿型径向迷宫密封的密封机理进行了研究,结果表明,节流间隙中的射流偏转和流束收缩,可以有效地降低间隙的实际通流面积,提高密封性能,从而可以用节流间隙中的射流偏转来取代微小的节流间隙,实现在较大的节流间隙下的良好密封。 相似文献
13.
14.
岭澳核电站循环水泵气囊密封损坏机理分析 总被引:1,自引:1,他引:1
岭澳核电站在循环水泵调试及试运行期间,在短短的三个月时间内,损坏了两台水泵的气囊密封,检修过程耗费了大量的人力物力。如果该故障发生在机组运行期间,就会影响机组的稳定运行,甚至会带来巨大的经济损失。本文以气囊密封试验台架的试验结果为依据,通过理论计算证明,循环水泵的气囊密封设计存在致命缺陷,提出了运行和维修操作防范措施,以避免故障的重复发生。 相似文献
15.
16.
Operation of a non-contact compliant gas foil seal (CFS) in a high temperature hybrid dynamic simulator representative of a small gas turbine engine spool is discussed. At the hot section of the simulator two oil-free components, a CFS and a compliant foil bearing (CFB) were mounted and at the cold (compressor) section of the simulator, an oil-mist lubricated ball bearing was installed. The preliminary numerical study on the fluid flow and thermal analysis of a CFS was discussed in the previous work by the authors. The experimental results for successful operation of the foil bearing and foil seal at temperatures up to 560 °C and speeds up to 55,000 rpm are presented. The surface of the CFS and CFB journals for high temperature tests were coated with PS304 solid lubricant film, developed by NASA The CFS performance at different operating speeds and temperatures and differential pressures was investigated. In a similar test, a leakage flow comparison was made among a labyrinth seal, a brush seal and a CFS. The experimental results indicate superior performance of the CFS over the two other types of seals. Unlike brush seal, CFS showed no evidence of rub or induced wear on the journal or seal surface. 相似文献
17.
18.
A previously validated finite difference computer model for seal leakage was used in developing an advanced seal with reduced leakage. A new design feature is an annular groove judiciously located in the stator housing. A detailed assessment of this preliminary groove configuration was conducted, both experimentally and computationally. It was found that the presence of the particular groove considered here contributes an approximately 20 percent decrease in leakage, while introducing no shaft speed effects. To enhance physical insight, detailed computed distributions of streamlines are included. Further, the interesting measured effect of the relative axial position of the rotor/stator sealing surfaces on leakage rate and stator wall axial pressure distribution is examined. 相似文献