攪拌器和混合器的密封3

1、The sealing of mixers and agitators攪拌器和混合器的密封3Steven_Tianjin1Motion seals are different than pump seals:移動(dòng)密封與泵的密封的不同處:Because of the misalignment potential they are almost always a stationary design. (The springs do not rotate with the shaft) 因?yàn)槲磳?duì)準(zhǔn)的可能性,它們通常大部分是固定設(shè)計(jì)(彈簧不與軸旋轉(zhuǎn))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. 內(nèi)部密封應(yīng)該在兩個(gè)方向上平衡,因?yàn)檫@

3、些應(yīng)用能夠在正壓和真空之間波動(dòng).這個(gè)特征也將防止內(nèi)部密封吹開(kāi)和允許屏蔽液體污染產(chǎn)品,如果你在兩個(gè)密封之間損失屏蔽液體壓力2Motion seals are different than pump seals:移動(dòng)密封與泵的密封的不同處: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. 旋轉(zhuǎn)硬面必須比容忍過(guò)大徑向移動(dòng)

4、的法線寬.一個(gè)加減0.125英寸的設(shè)計(jì)移動(dòng)是典型的The internal clearances must be greater than pump seals to prevent contact during excessive radial movement. 內(nèi)部間隙必須比泵的密封大,防止在過(guò)大徑向移動(dòng)時(shí)的接觸3Motion seals are different than pump seals:移動(dòng)密封與泵的密封的不同處: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. 靜面必須在一些方式下的彈簧加載,來(lái)防止在軸向移動(dòng)的期間內(nèi)加載一個(gè)而卸載另外一個(gè).做這個(gè)的最簡(jiǎn)單的方法是用彈簧加載兩個(gè)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筒的設(shè)計(jì)對(duì)于正確和容易的安裝是必要的,并且允許你在側(cè)進(jìn)和底進(jìn)的應(yīng)用中,不用排空混合器而進(jìn)行密封的更換.確信密封有一些種類(lèi)的自找正特性來(lái)補(bǔ)償由于在筒中設(shè)置螺釘引起的錯(cuò)位4Motion seals are diffe

7、rent than pump seals:移動(dòng)密封與泵的密封的不同處: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單獨(dú)分離密封,安裝在分離套上,對(duì)于混合器類(lèi)型的應(yīng)用(見(jiàn)以下圖示)已經(jīng)變的非常普遍.軸的移動(dòng)能通過(guò)在填料箱中安裝一個(gè)分離套軸承能夠部分的穩(wěn)定.對(duì)于這個(gè)分離軸承,一個(gè)很寬范圍的不同的材料可以利用.與你的本地分銷(xiāo)商聯(lián)系5Motion seals are different than pump seals:移動(dòng)密封與泵的密封的不同處: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.這些分離密封對(duì)于這些混合器也是一個(gè)很好的選擇,這些混合器有一個(gè)移動(dòng)的軸,它密封一個(gè)聚四氟乙烯環(huán)到罐壁,并且允許

10、你在沒(méi)有排空混合器的情況下更換密封.這是超過(guò)原始設(shè)備設(shè)計(jì)的主要的提高,因?yàn)槟悴恍枰瞥S的雙法蘭短節(jié)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.它將很明顯,當(dāng)雙法蘭短節(jié)被移除時(shí),這里通常沒(méi)有力來(lái)維持聚四氟乙烯環(huán)到罐壁6Motion seals are different than pump seals:移動(dòng)密封與泵的密封的不同處:Bottom entering shafts cr

11、eate a different set of problems. Look at the following illustration:底部進(jìn)入軸引起一個(gè)不同的設(shè)置問(wèn)題,看下面的圖示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.污垢和固體進(jìn)入填料箱,并且不能被離心甩出.沖洗

12、液體趨向于穿過(guò)固體的通道,并且對(duì)從填料箱中移除它們作了不好的工作7Motion seals are different than pump seals:移動(dòng)密封與泵的密封的不同處:There are a couple of possible solutions.這里有幾個(gè)可能解決的方法: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切開(kāi)填料箱并移動(dòng)密封到容器中,這樣離心力將從柔軟的密封組件中移除固體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