渣浆泵迷宫密封的优点与缺点

图5-18所示为金属迷宫密封，图5-19 所示为炭精迷宫密封。它们是由密封片与轴组成微小间隙，液体通过间隙时，由于节流作用产生压力降低，从而达到密封目的。
3.螺旋密封
    如图5-20所示，它是利用螺旋原理，当液体介质沿泄漏间隙渗漏时，借助螺旋作用将液体介质反推回去，达到密封作用，螺旋密封为单向密封，所以要注意螺旋的旋向和转动方向，使液体反推。如轴的旋转方向是从右向左看为顺时针方向，则液体介质与壳体的摩擦力F为逆时针方向，而摩擦力F在该右螺纹的螺旋线上的分力A向右，故液体介质被推向右方。为了增加密封效果，在壳体上也开有螺纹槽，与轴上螺纹相反，并采用多头螺纹，密封效果会更好些。
    螺旋密封系无接触式密封，其结构简单，制造安装要求精度低，维修方便，使用寿命长，特别适用于高温、深冷、腐蚀性、高黏度、有颗粒的液体中，但螺纹密封达到完全密封比较困难，会有一定的泄漏量，并且只能使用在压力较低的地方(p<1. 0MPa)。螺旋密封为动密封，停泵时不能起密封作用，所以需要与停机密封配合使用，或作为辅助密封与其他轴封配合使用。渣浆泵厂家

Advantages and disadvantages of labyrinth seal for slurry pump

Figure 5-18 shows the metal labyrinth seal, and figure 5-19 shows the carbon labyrinth seal. They are composed of a small gap between the seal plate and the shaft. When the liquid passes through the gap, the pressure is reduced due to the throttling effect, so as to achieve the purpose of sealing.

3. Screw seal

As shown in Fig. 5-20, it is based on the principle of screw. When the liquid medium leaks along the leakage gap, it reverses the liquid medium with the help of the screw function to achieve the sealing function. The screw seal is a one-way seal, so pay attention to the screw direction and rotation direction to make the liquid reversely push. If the rotation direction of the shaft is clockwise from right to left, the friction force F between the liquid medium and the shell is counterclockwise, and the component a of the friction force F on the helix of the right thread is to the right, so the liquid medium is pushed to the right. In order to increase the sealing effect, a threaded groove is also opened on the shell, which is opposite to the thread on the shaft, and multiple threads are used, so the sealing effect will be better.

Screw seal is a non-contact seal, which has simple structure, low precision in manufacturing and installation, convenient maintenance and long service life. It is especially suitable for high temperature, deep cooling, corrosive, high viscosity and granular liquid. However, it is difficult for screw seal to achieve complete sealing, and there will be a certain amount of leakage, and it can only be used in the place with low pressure (P < 1.0MPa). The screw seal is a dynamic seal, which can not play a sealing role when the pump is stopped, so it needs to be used together with the stop seal, or as an auxiliary seal with other shaft seals. Slurry pump manufacturer