| 潜水排污泵·副叶轮流体动力密封 |
| 添加时间：2019/2/12 16:36:47 浏览次数： |
| 所谓的副叶轮流体动力密封是指在泵的叶轮后盖板背面附近同轴反方向安装一开式叶轮。当泵工作时,副叶轮随泵主轴一起旋转,副叶轮中的液体也会一起旋转,转动的液体会产生一个向外的离心力,这个离心力一方面顶住流向机械密封处的液体,降低了机械密封处的压力。 The so-called auxiliary impeller hydrodynamic seal refers to the installation of an open impeller in coaxial reverse direction near the back of the impeller cover plate of the pump. When the pump works, the auxiliary impeller rotates with the main shaft of the pump, and the liquid in the auxiliary impeller also rotates together. The rotating liquid will produce an outward centrifugal force. On the one hand, the centrifugal force holds the liquid flowing to the mechanical seal and reduces the pressure at the mechanical seal. 另一方面阻止介质中的固体颗粒进入机械密封的摩擦副中,减少机械密封磨块的磨损,延长了其使用寿命。 On the other hand, the solid particles in the medium are prevented from entering the friction pair of the mechanical seal, which reduces the wear of the abrasive block of the mechanical seal and prolongs its service life. 副叶轮除了起到密封作用外,还可以起到降低轴向力的作用,在潜污泵中轴向力主要是由液体作用在叶轮上的压差力和整个转动部分的重力所组成,这两个力的作用方向是相同的,合力是由两个力相加而成。 In addition to sealing, auxiliary impeller can also play the role of reducing the axial force. In the submersible sewage pump, the axial force is mainly composed of the differential pressure acting on the impeller by liquid and the gravity of the whole rotating part. The direction of action of the two forces is the same, and the combined force is composed of two forces. 可以看出,在性能参数完全相同的情况下,潜污泵的轴向力比一般卧式泵要大,而平衡难度比立式泵要难。 It can be seen that under the same performance parameters, the axial force of submersible sewage pump is larger than that of general horizontal pump, and the balance difficulty is more difficult than that of vertical pump. 所以在潜污泵中,轴承容易损坏其原因也是与轴向力大有着很大的关系。而如果安装了副叶轮,液体作用在副叶轮上压差力的方向是与上述两力的合力相反的,这样可以抵消一部分轴向力,也就起到了延长轴承寿命的作用。 Therefore, in the submersible sewage pump, bearing is easy to damage its reason is also related to the large axial force. If the auxiliary impeller is installed, the direction of the pressure differential force acting owww.qinhuandaobanjia.cnwww.chengshidiaos.cnwww.penquandiaosu.com.cnwww.hanbaiyulangan.cn www.shidiaopixiu.cnwww.huganqii.cnn the auxiliary impeller is opposite to the resultant force of the two forces mentioned above, which can offset part of the axial force and prolong the life of the bearing. 但是使用副叶轮密封系统也有一个缺点,那就是在副叶轮上要消耗一部分能量,一般在3%左右,但是只要设计合理,完全可以把这部分损失降低到最低限度。But there is also a disadvantage of using the auxiliary impeller seal system, that is, it consumes a part of energy on the auxiliary impeller, generally about 3%, but as long as the design is reasonable, this part of the loss can be reduced to the minimum. |
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