离心泵汽蚀问题的解决方法有哪些
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发布时间:2022-08-15 17:10
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热心网友
时间:2023-09-17 12:55
解决办法:
(1)改进离心泵的吸入口至叶轮附近的结构设计。增大过流面积;增大叶轮盖板进口段的曲率半径,减小液流急剧加速与降压;适当减少叶片进口的厚度,并将叶片进口修圆,使其接近流线形,也可以减少绕流叶片头部的加速与降压;提高叶轮和叶片进口部分表面光洁度以减小阻力损失;将叶片进口边向叶轮进口延伸,使液流提前接受作功,提高压力。
(2)采用前置诱导轮,使液流在前置诱导轮中提前作功,以提高液流压力。
(3)采用双吸叶轮,让液流从叶轮两侧同时进入叶轮,则进口截面增加一倍,进口流速可减少一倍。
(4)设计工况采用稍大的正冲角,以增大叶片进口角,减小叶片进口处的弯曲,减小叶片阻塞,以增大进口面积;改善大流量下的工作条件,以减少流动损失。但正冲角不宜过大,否则影响效率。
(5)采用抗气蚀的材料。实践表明,材料的强度、硬度、韧性越高,化学稳定性越好,抗气蚀的性能越强。
提高进液装置有效气蚀余量的措施:
(1)增加离心泵前贮液罐中液面的压力,以提高有效气蚀余量。
(2)减小吸上装置泵的安装高度。
(3)将上吸装置改为倒灌装置。
(4)减小离心泵前管路上的流动损失。如在要求范围尽量缩短管路,减小管路中的流速,减少弯管和阀门,尽量加大阀门开度等。
热心网友
时间:2023-09-17 12:55
※改进泵入口的结构参数※
这一方案适于在离心泵的设计制造阶段,该方法在生产现场很少采用。
※在泵的吸入口加装诱导轮※
加装诱导轮,对提高离心泵的抗汽蚀性能,解决汽蚀问题,效果很显著。而且其结构简单易于制造安装,运行维修方便,造价低,在不影响生产的前提下即可进行安装调试,特别适于在生产现场推广应用。
※合理设计吸入管路及调整安装高度※
该方法虽能彻底消除汽蚀问题,但在生产现场却很少采用。这是因为调整泵的吸入管路及安装高度,工程量大、施工费用高,并且受施工环境的制约,只有在装置停车或大检修时才能进行;同时,由于工艺条件的*,调整泵的吸入管路及安装高度又将影响后续工艺,具有连锁反应。
※优化工艺操作条件※
在工艺条件允许的情况下,改变泵的流量、扬程、转速及介质的操作温度等操作参数,可以避免汽蚀的发生。但由于工艺条件的*,优化工艺操作条件具有很大的局限性,大部分情况下效果并不显著。所以,可将该方法作为解决汽蚀问题的辅助方法。
在不影响正常生产的前提下,解决机泵的汽蚀问题,应首选在其入口加装诱导轮。
Without affecting the normal proction of the premise, the resolution of pump cavitation, it should be first choice at the entrance to the installation of incer.
※to improve the structural parameters of Pump Inlet※
This program suited for centrifugal pump design and manufacture phase, the method rarely used in the proction of the site.
※In the pump suction-inced wheel retrofit※
Installation of incer, enhancing the anti-cavitation performance of centrifugal pumps to solve the problem cavitation, the effect is very significant. That its structure is simple and easy to manufacture and installation, operation maintenance of convenient, low cost, without affecting the proction can be carried out under the premise of installation, particularly suitable for use in the proction of on-site promotion.
※rational design of suction pipe and adjust the mounting height※
Although this method can completely eliminate cavitation problems, but the site is seldom used in the proction. This is because the adjustment of the pump suction pipe and installation height, work volume, high cost of construction, and by the construction of environmental constraints, and only in the device when the parking or large maintenance be carried out; the same time, e to process conditions, the adjustment of the pump suction pipe and install a high degree of turn affect the follow-up process, with a knock-on effect.
※optimum process operating conditions※
In the process conditions permit, the change in pump flow, head, speed and medium operating temperature operating parameters, to avoid the occurrence of cavitation. However, process conditions, optimization of process operating conditions have significant limitations, in most cases results were not significant. Therefore, this method could be to solve the cavitation problem supporting facilities.淄博邦成泵业