陶瓷渣浆泵能不能安装机械密封

机械密封又称端面密封，其基本元件与工作原理如图2-9所示，主要由动环5 (随轴一起旋转并能作轴向移动)、静环6、压紧元件(弹簧2)和密封元件(密封圈4、7)等组成。动环籍密封腔中液体的压力和压紧元件的压力，使其端面贴合在静环的端面上，并在两环端面A

产生适当的比压(单位面积上的压紧力)和保持一层极海的液体膜而达到密封的目的。而动环和轴之间的问隙B由动环密封圈4密封，静环和压盖之间的间际C由静环密封圈7密封。如此构成的三道密封(即A、B、C三个界面之密封)，封堵了密封腔中液体向外泄漏的全部可能的途径。密封元件除了密封作用以外，还与作为压紧元件的弹簧一道起到 了缓冲补偿作用。泵在运转中，轴的振动如果不加级冲地直接传递到密封端面上，那么密封端面不能紧密贴合而会使泄漏量增加，或者由于过大的轴向载荷而导致密封端面磨损严重，使密封失效。另外，端面因摩擦必然会产生磨损，如果没有级冲补偿，势必会造成端面的间隙越来越大而无法密封。

机械密封有许多种类，下面仅介绍平衡型和非平衡型机械密封(图2-10)。

非平衡型:密封介质作用在动环上的有效面积B ( 去掉作用压力相互抵消的部分的面积)等于或大于动、静环端面接触面积A。端面上的压力取决于密封介质的压力，介质压力增加，端面上的比压成正比地增加。如果端面的比压太大，则可能造成密封泄漏严重，寿命缩短，因此非平衡型机械密封不宜在高压下使用。

平衡型:密封介质作用在动环上的有效面积B小于端面接触面积A。当介质压力增大时，端面上的比压增加缓慢，亦即介质压力的高低对端面的比压影响较小，因此平衡型可用于压下的机械密封。

Can ceramic slurry pumps be equipped with mechanical seals

Mechanical seals, also known as end seals, have basic components and working principles as shown in Figures 2-9. They are mainly composed of moving rings 5 (which rotate with the shaft and can move axially), stationary rings 6, compression components (spring 2), and sealing components (sealing rings 4, 7). The pressure of the liquid in the sealing chamber of the dynamic ring and the pressure of the compression component make its end face fit against the end face of the static ring, and place it on the two ring end faces A

Generate appropriate specific pressure (compression force per unit area) and maintain a layer of polar liquid film to achieve sealing. The gap B between the moving ring and the shaft is sealed by the moving ring seal ring 4, and the gap C between the stationary ring and the gland is sealed by the stationary ring seal ring 7. The three seals formed in this way (i.e. the seals at the interfaces A, B, and C) block all possible paths for liquid leakage from the sealing chamber. In addition to the sealing effect, the sealing element also plays a buffering and compensating role together with the spring as the compression element. During the operation of the pump, if the vibration of the shaft is directly transmitted to the sealing end face without further impact, the sealing end face cannot fit tightly and the leakage will increase, or due to excessive axial load, the sealing end face will be severely worn, resulting in sealing failure. In addition, the end face will inevitably experience wear due to friction, and without stage impact compensation, it will inevitably cause the gap between the end faces to become larger and larger, making it impossible to seal.

There are many types of mechanical seals, and the following only introduces balanced and non balanced mechanical seals (Figure 2-10).

Non equilibrium type: The effective area B of the sealing medium acting on the dynamic ring (excluding the area where the pressure counteracts each other) is equal to or greater than the contact area A of the dynamic and static ring end faces. The pressure on the end face depends on the pressure of the sealing medium, and as the medium pressure increases, the specific pressure on the end face increases proportionally. If the specific pressure of the end face is too large, it may cause serious seal leakage and shorten the service life. Therefore, non balanced mechanical seals should not be used under high pressure.

Balanced type: The effective area B of the sealing medium acting on the moving ring is smaller than the contact area A of the end face. When the medium pressure increases, the specific pressure on the end face increases slowly, which means that the height of the medium pressure has a small impact on the specific pressure on the end face. Therefore, the balanced type can be used for mechanical seals under pressure.