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渣漿泵油封密封的優(yōu)缺點(diǎn)
優(yōu)點(diǎn):結(jié)構(gòu)簡單，價(jià)格便宜，軸向尺寸小，密封性能好。
缺點(diǎn):壽命短，會磨損軸(軸套)，使用溫度、壓力較低，溫度應(yīng)低于60°C，壓力小于0. 2MPa,線速度小于6 ~ 10m/s, 所以一般只用于較小的低揚(yáng)程的泵中。
四、其他軸封
1. 浮動環(huán)密封
浮動環(huán)密封如圖5-17所示，它是由浮動環(huán)端面和浮動套端面的接觸來實(shí)現(xiàn)軸向密封
的，徑向密封是由軸套外圈表面與浮動環(huán)內(nèi)圓面形成的狹窄縫隙產(chǎn)生的節(jié)流來密封的。浮動環(huán)密封有自動調(diào)心的優(yōu)點(diǎn)，所以徑向間隙可以做得相當(dāng)?shù)男?。彈?/span>3起支承動環(huán)的作用。為了增加密封性能，可用彼此相接的幾個(gè)環(huán)串起來使用。浮動環(huán)外面的卸壓孔接到低壓區(qū)去，這樣才能使密封縫隙起到節(jié)流作用，千萬不可將卸壓孔堵死，否則就會起不到密封的作用?？紤]到起動和停泵時(shí)浮動環(huán)有可能與軸套摩擦，因此常選擇耐磨的材料，介質(zhì)為水時(shí)要考慮防銹，所以一般浮 動環(huán)用銅制造，軸套用不銹鋼表面鍍鉻制成。
浮動環(huán)密封結(jié)構(gòu)簡單，運(yùn)轉(zhuǎn)可靠，泄漏量小于填料密封(但比機(jī)械密封大)?？梢杂迷诟邷?/span>(200~400C) 高壓(10 ~ 20MPa)的場合，其缺點(diǎn)是軸向尺寸較大，并有一定量的泄漏。渣漿泵廠家
Advantages and disadvantages of slurry pump oil seal
Advantages: simple structure, low price, small axial size, good sealing performance.
Disadvantages: the service life is short, the shaft (shaft sleeve) will be worn, the service temperature and pressure are low, the temperature should be lower than 60 ° C, the pressure is less than 0.2MPa, and the linear speed is less than 6 ~ 10m / s, so it is generally only used in small pumps with low head.
IV. other shaft seals
1. Floating ring seal
The floating ring seal is shown in Figure 5-17, which realizes the axial seal by the contact between the end face of the floating ring and the end face of the floating sleeve
The radial seal is sealed by throttling caused by the narrow gap between the outer ring surface of the shaft sleeve and the inner circle surface of the floating ring. Floating ring seal has the advantage of automatic centering, so the radial clearance can be made quite small. Spring 3 supports the moving ring. In order to increase the sealing performance, several rings connected to each other can be used in series. The relief hole outside the floating ring is connected to the low-pressure area, so as to make the sealing gap play a throttling role. Never block the relief hole, otherwise it will not play a sealing role. In consideration of the possibility of friction between floating ring and shaft sleeve during start-up and stop of pump, wear-resistant materials are often selected, and rust prevention shall be considered when the medium is water, so the floating ring is generally made of copper, and the shaft sleeve is made of stainless steel with chrome plated surface.
The floating ring seal has simple structure, reliable operation, and less leakage than the packing seal (but larger than the mechanical seal). It can be used in high temperature (200 ~ 400C) and high pressure (10 ~ 20MPa) situations. Its disadvantage is large axial size and a certain amount of leakage. Slurry pump manufacturer
