環(huán)境控制和專用密封

1、Environmental controls and special seals 環(huán)境控制和專用密封Steven_Tianjin1Environmental controls and special seals 環(huán)境控制和專用密封For any given seal application problem there are two generally accepted solutions :對于任何給定密封應(yīng)用的問題,這里有兩個通常的可以接受的方法Build a special seal that can compensate for the problem once it occurs.

2、建造一個特殊的密封,一旦它發(fā)生,它對這些問題給予補(bǔ)償Control the environment surrounding the seal to prevent the problem from occurring in the first place. If you control the seal environment you will avoid the inventory and delivery problems associated with special seals.控制密封周圍的環(huán)境,在第一地點防止問題的發(fā)生.如果你控制密封環(huán)境,你將避免與特殊密封相關(guān)的庫存和交貨問題In

3、 the following paragraphs I will be covering each of these environmental controls in detail.在以下的章節(jié)中,我們將覆蓋這些環(huán)境控制中的每一個細(xì)節(jié)2CONTROLLING THE TEMPERATURE IN THE STUFFING BOX AREA控制填料箱內(nèi)區(qū)域的溫度Flush the stuffing box ( port C in the illustrations at the end of this paper) with a compatible, cool, clean liquid.

4、Many seal glands have this connection available in a more convenient location than the lantern ring connection. Flush is a misunderstood term. It describes six very different functions: 使用一個兼容的,涼的,干凈的液體沖洗填料箱(在本文末尾插圖中的口)許多密封壓蓋有這種連接可用，它是比套環(huán)連接更方便的位置沖洗是一個誤解的術(shù)語它描述個非常不同的功能Discharge recirculation, where a

5、line is connected from the discharge side of the pump to the lantern ring connection in the stuffing box (A), or an appropriate connection in the gland. 排放再循環(huán)，這里有一個管線從泵的排放側(cè)連到填料箱（）中的套環(huán)上，或壓蓋中的一個恰當(dāng)?shù)倪B接3CONTROLLING THE TEMPERATURE IN THE STUFFING BOX AREA控制填料箱內(nèi)區(qū)域的溫度Suction recirculation, The recirculatio

6、n line is connected from the bottom of the stuffing box to the suction side of the pump (A).吸入在循環(huán)，循環(huán)管線從填料箱的底部連接到泵的吸入側(cè)（） Jacketing fluid, The cooling or heating fluid flows through a jacket that is surrounding the stuffing box (B). 水套液體，冷卻或加熱液體從環(huán)繞填料箱（）的一個套中流過Barrier or buffer fluid, The fluid is circ

7、ulated between two seals either by convection or by a separate circulation system (E)屏蔽或緩沖器液體，液體在兩個密封之間通過對流或單獨(dú)的循環(huán)系統(tǒng)（）來循環(huán)4CONTROLLING THE TEMPERATURE IN THE STUFFING BOX AREA控制填料箱內(nèi)區(qū)域的溫度Quench, The fluid is passed between the seal and a disaster bushing that has been installed in the rear of the seal

8、gland (D). 窒息，液體通過密封之間，一個災(zāi)難性的軸襯被安裝在密封壓蓋（）的后面中Flush, A liquid, from an outside source, is injected into the stuffing box at one atmosphere above stuffing box pressure and dilutes the product a small amount (C). 沖洗，從外界源的一個液體，在高出填料箱壓力一個大氣壓的情況下注射到填料箱中，并且沖淡產(chǎn)品到很小的量（）Use two seals with a cool liquid circul

9、ating between them (E). A two way balanced cartridge seal would be an excellent choice. This arrangement provides cooling at the seal faces where it will often do the most good. 使用兩個密封，并且在它們（）之間有冷卻液體循環(huán)一個兩位平衡筒式密封是一個很好的選擇這個安排在密封面提供冷卻，這里它將更有利益5CONTROLLING THE TEMPERATURE IN THE STUFFING BOX AREA控制填料箱內(nèi)區(qū)

10、域的溫度Use the jacketed stuffing box that came installed on the pump (figure B) or install one if it is missing. These jackets are available as a replacement part for the back plate on most popular pumps or as an after market bolt on accessory. To use the jacket properly:使用一個帶套填料箱，它被安裝在泵上（圖），或它丟失安裝一個這些

11、套是可利用的，因為在大多數(shù)通俗的泵上對后板有一個可以更換的部件，或者作為附件上的一個銷售后市場螺釘來恰當(dāng)?shù)氖褂锰譊ead end the fluid you are trying to control. This means no lines in or out of the stuffing box except those used to circulate the jacketing fluid.你試圖控制的液體是死頭，沒有管線進(jìn)出填料箱，除了這些被使用的循環(huán)套液體Install a thermal bushing in the bottom of the stuffing box. C

12、arbon is a good choice because it is a poor conductor of heat compared to the metal pump components. A typical clearance over the shaft would be 0.002 inches per inch of shaft diameter ( 0,01 mm/mm of shaft diameter).在填料箱的底部安裝一個熱的軸襯碳是一個很好的選擇，因為與金屬泵的元件相比，它是熱的不良導(dǎo)體在軸上通常的間隙為軸直徑的每英寸.英寸（.mm/mm 軸的直徑）6CONTR

13、OLLING THE TEMPERATURE IN THE STUFFING BOX AREA控制填料箱內(nèi)區(qū)域的溫度Circulate the heating or cooling fluid, through the jacket, to control the temperature. Six to eight gpm. (25 to 30 liters /min.) is typical of the amount of cool water needed to cool down heat transfer fluid to the point where it will stop c

14、oking and Viton O-rings will be acceptable. If your water is too hard you can substitute condensate or low pressure steam.用通過套的加熱或冷卻液體來控制溫度到gpm(25到升分鐘)是通常需要的冷卻水的量，來冷卻熱傳導(dǎo)液體到他將停止煉焦點和型圈可以接受的如果你的水太硬，你可以使用代替的冷凝物或低壓蒸氣7CONTROLLING THE TEMPERATURE IN THE STUFFING BOX AREA控制填料箱內(nèi)區(qū)域的溫度An A.P.I. Gland is availa

15、ble for most mechanical seals. The gland has several features to provide various functions. It can be used as: 一個壓蓋對于大多數(shù)密封都是可利用的壓蓋有幾個特征來提供不同的功能，它能被使用為：A quench connection (Q) to provide heating, cooling, or to remove any vapors that might escape between the seal faces. Steam can be injected to lower

16、 the seal temperature in the event of a fire. In the event of a major seal failure, this quench connection can be used, in conjunction with the gland disaster bushing, to direct seal fluid leakage to point where it can be collected.阻封連接（Q）提供加熱，冷卻或去除一些蒸汽，它可能從密封面之間逃脫.在有火的情況下,蒸汽能夠被注入來降低密封的溫度.在一個密封故障的主要

17、事件中,這個阻封連接能夠被使用,與壓蓋套筒聯(lián)系,來直接密封液體泄漏到它能被收集的點8CONTROLLING THE TEMPERATURE IN THE STUFFING BOX AREA控制填料箱內(nèi)區(qū)域的溫度A flush connection (F) to provide clean fluid to the stuffing box or it can be used to vent the stuffing box and seal in a vertical pump application.一個沖洗連接(F)來提供清潔的液體到填料箱或它能被使用在垂直泵應(yīng)用中對填料箱和密封的排氣A

18、close fitting, non sparking, disaster bushing (DB) to provide shaft support in the event of a bearing failure or to protect personnel in the event of a massive seal failure一個精密裝置,沒有火花,故障軸襯(DB)在軸承故障中對軸提供支撐,或在一個大的密封故障中保護(hù)人員9CONTROLLING THE TEMPERATURE IN THE STUFFING BOX AREA控制填料箱內(nèi)區(qū)域的溫度Heat tape or tracing lines can be installed around the stuffing box to provide