搅拌器和混合器的密封3

1、The sealing of mixers and agitators搅拌器和混合器的密封3Steven_Tianjin1Motion seals are different than pump seals:移动密封与泵的密封的不同处:Because of the misalignment potential they are almost always a stationary design. (The springs do not rotate with the shaft) 因为未对准的可能性,它们通常大部分是固定设计(弹簧不与轴旋转)The inner seal should be b

2、alanced in both directions because many of these applications can fluctuate between pressure and vacuum. This feature will also prevent the inner seal from blowing open and allowing the barrier fluid to contaminate the product if you loose barrier fluid pressure between the seals. 内部密封应该在两个方向上平衡,因为这

3、些应用能够在正压和真空之间波动.这个特征也将防止内部密封吹开和允许屏蔽液体污染产品,如果你在两个密封之间损失屏蔽液体压力2Motion seals are different than pump seals:移动密封与泵的密封的不同处:The rotating hard faces must be wider than normal to accommodate the excessive radial motion. A design movement of plus or minus 0.125 inches (3 mm) would be typical. 旋转硬面必须比容忍过大径向移动

4、的法线宽.一个加减0.125英寸的设计移动是典型的The internal clearances must be greater than pump seals to prevent contact during excessive radial movement. 内部间隙必须比泵的密封大,防止在过大径向移动时的接触3Motion seals are different than pump seals:移动密封与泵的密封的不同处:The stationary faces must be spring loaded in some manner to prevent loading one s

5、eal and unloading the other during periods of axial movement. The easiest way to do this is to spring load the faces together. 静面必须在一些方式下的弹簧加载,来防止在轴向移动的期间内加载一个而卸载另外一个.做这个的最简单的方法是用弹簧加载两个面在一起Cartridge designs are necessary for correct and easy installation and to allow you to change seals without empt

6、ying the mixer in Side Entering and Bottom Entering applications. Be sure the seal has some sort of self aligning feature to compensate for misalignment caused by the set screws in the cartridge筒的设计对于正确和容易的安装是必要的,并且允许你在侧进和底进的应用中,不用排空混合器而进行密封的更换.确信密封有一些种类的自找正特性来补偿由于在筒中设置螺钉引起的错位4Motion seals are diffe

7、rent than pump seals:移动密封与泵的密封的不同处:Single split seals, mounted on a split sleeve have become very popular for mixer type applications (see the following illustration). The shaft movement can be partially stabilized by installing a split sleeve bearing in the stuffing box. A wide variety of materials

8、 are available for this split bearing. Check with your local distributor单独分离密封,安装在分离套上,对于混合器类型的应用(见以下图示)已经变的非常普遍.轴的移动能通过在填料箱中安装一个分离套轴承能够部分的稳定.对于这个分离轴承,一个很宽范围的不同的材料可以利用.与你的本地分销商联系5Motion seals are different than pump seals:移动密封与泵的密封的不同处:The split seal is also a good choice for those mixers that have

9、a moveable shaft that seals a Teflon ring against the tank wall and allows you to change the seal without emptying the mixer. This is a major improvement over the original equipment design because you do not have to remove the shaft spool piece.这些分离密封对于这些混合器也是一个很好的选择,这些混合器有一个移动的轴,它密封一个聚四氟乙烯环到罐壁,并且允许

10、你在没有排空混合器的情况下更换密封.这是超过原始设备设计的主要的提高,因为你不需要移除轴的双法兰短节It should be obvious that when the spool piece is removed there is usually no force to hold the Teflon ring against the mixer wall.它将很明显,当双法兰短节被移除时,这里通常没有力来维持聚四氟乙烯环到罐壁6Motion seals are different than pump seals:移动密封与泵的密封的不同处:Bottom entering shafts cr

11、eate a different set of problems. Look at the following illustration:底部进入轴引起一个不同的设置问题,看下面的图示Dirt and solids fall into the stuffing box and cannot be centrifuged out. Flushing liquid tends to channel through the solids and does a poor job of removing them from the stuffing box.污垢和固体进入填料箱,并且不能被离心甩出.冲洗

12、液体趋向于穿过固体的通道,并且对从填料箱中移除它们作了不好的工作7Motion seals are different than pump seals:移动密封与泵的密封的不同处:There are a couple of possible solutions.这里有几个可能解决的方法:Cut off the stuffing box and move the seal into the vessel so that centrifugal force will throw the solids away from the flexible seal components切开填料箱并移动密封到容器中,这样离心力将从柔软的密封组件中移除固体Use a higher specific gravity fluid in the stuffing box to prevent gravity from pulling the solids into the seal area. A high density grease could be a