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陶瓷渣漿泵能不能安裝機(jī)械密封
機(jī)械密封又稱端面密封，其基本元件與工作原理如圖2-9所示，主要由動(dòng)環(huán)5 (隨軸一起旋轉(zhuǎn)并能作軸向移動(dòng))、靜環(huán)6、壓緊元件(彈簧2)和密封元件(密封圈4、7)等組成。動(dòng)環(huán)籍密封腔中液體的壓力和壓緊元件的壓力，使其端面貼合在靜環(huán)的端面上，并在兩環(huán)端面A
產(chǎn)生適當(dāng)?shù)谋葔?/span>(單位面積上的壓緊力)和保持一層極海的液體膜而達(dá)到密封的目的。而動(dòng)環(huán)和軸之間的問(wèn)隙B由動(dòng)環(huán)密封圈4密封，靜環(huán)和壓蓋之間的間際C由靜環(huán)密封圈7密封。如此構(gòu)成的三道密封(即A、B、C三個(gè)界面之密封)，封堵了密封腔中液體向外泄漏的全部可能的途徑。密封元件除了密封作用以外，還與作為壓緊元件的彈簧一道起到 了緩沖補(bǔ)償作用。泵在運(yùn)轉(zhuǎn)中，軸的振動(dòng)如果不加級(jí)沖地直接傳遞到密封端面上，那么密封端面不能緊密貼合而會(huì)使泄漏量增加，或者由于過(guò)大的軸向載荷而導(dǎo)致密封端面磨損嚴(yán)重，使密封失效。另外，端面因摩擦必然會(huì)產(chǎn)生磨損，如果沒(méi)有級(jí)沖補(bǔ)償，勢(shì)必會(huì)造成端面的間隙越來(lái)越大而無(wú)法密封。
機(jī)械密封有許多種類，下面僅介紹平衡型和非平衡型機(jī)械密封(圖2-10)。
非平衡型:密封介質(zhì)作用在動(dòng)環(huán)上的有效面積B ( 去掉作用壓力相互抵消的部分的面積)等于或大于動(dòng)、靜環(huán)端面接觸面積A。端面上的壓力取決于密封介質(zhì)的壓力，介質(zhì)壓力增加，端面上的比壓成正比地增加。如果端面的比壓太大，則可能造成密封泄漏嚴(yán)重，壽命縮短，因此非平衡型機(jī)械密封不宜在高壓下使用。
平衡型:密封介質(zhì)作用在動(dòng)環(huán)上的有效面積B小于端面接觸面積A。當(dāng)介質(zhì)壓力增大時(shí)，端面上的比壓增加緩慢，亦即介質(zhì)壓力的高低對(duì)端面的比壓影響較小，因此平衡型可用于壓下的機(jī)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.
