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渣漿泵機(jī)械密封的沖洗和冷卻有什么不同
(1)機(jī)械密封的沖洗
機(jī)械密封的沖洗和冷卻屬機(jī)械密封的輔助設(shè)施。機(jī)被密封的沖洗可以用來(lái)降低溫度，保持密封端面的良好潤(rùn)滑，防止汽化而不會(huì)造成干摩擦，及在有固體顆粒、結(jié)晶介質(zhì)及強(qiáng)腐蝕介質(zhì)中保持密封環(huán)不受損害。因此，機(jī)械密封的沖洗和冷卻是必不可少的。
機(jī)械密封沖洗的方式，有自沖洗、循環(huán)沖洗和注入式?jīng)_洗三種。
自沖洗是用泵本身產(chǎn)生的壓差或密封腔內(nèi)的泵送裝置產(chǎn)生的壓差，使被密封介質(zhì)通過(guò)密封腔形成閉合回路實(shí)現(xiàn)沖洗。泵本身產(chǎn)生的壓差沖洗一般是從泵的出口引入機(jī)封腔中進(jìn)行中洗，然后回到泵進(jìn)口。如果泵輸送的液體溫度較高時(shí)，中間可接入冷卻器， 冷卻后再送入密封腔沖洗密封端面。
泵送裝置的沖洗是將軸封腔內(nèi)的液體通過(guò)泵送裝置升壓，送到冷卻器冷卻后，又送回軸封腔沖洗機(jī)封，應(yīng)用于泵送裝置的升壓裝置，可以是小葉輪、旋渦葉輪或泵送螺旋等，液體溫度較高情況下使用。
循環(huán)沖洗稱(chēng)額外循環(huán)沖洗，是通過(guò)一個(gè)泵送裝置使外加的密封流體進(jìn)行循環(huán)，泵送裝置可以是外加的，也可以在密封腔中加裝一個(gè)泵裝置。這種沖洗方法多用于雙端面或多端面密封上。單端面密封一般不采用。
注入式?jīng)_洗或稱(chēng)外沖洗，是從外部注人另一種液體到密封腔內(nèi)，改善密封工作條件，這種方法一般是被輸送介質(zhì)不宜做密封流體時(shí)采用。例被輸送介質(zhì)含固體顆粒或黏度大或溫度太高等。
(2)機(jī)械密封的冷卻
在輸送高溫介質(zhì)時(shí)，對(duì)機(jī)封應(yīng)進(jìn)行冷卻。冷卻方式可為直接冷卻和間接冷卻兩種。直接
冷卻，一種是上面所說(shuō)的冷卻液體沖洗。另一種是在壓蓋上通入冷卻液體冷卻靜環(huán)，在密封腔外面的部分，即稱(chēng)“急冷”或稱(chēng)“背冷”。這部分冷卻液不回流到泵內(nèi)，而是被排放掉了，所以常常用冷水進(jìn)行。
間接冷卻是在密封腔外面加冷卻夾套，如圖5-13 所示，冷卻夾套的冷卻液一般是外界引入的冷水。常與泵軸承的冷卻，泵支腳的冷卻起組成的冷卻系統(tǒng)。
一般泵輸送 介質(zhì)溫度大于 150或沒(méi)有沖洗時(shí)，或低沸點(diǎn)液體，高熔點(diǎn)產(chǎn)品都需要間接冷卻。鍋爐給水泵中也一般需要間接冷卻。
泵的冷卻管路系統(tǒng)常在泵的說(shuō)明書(shū)中、相關(guān)的標(biāo)準(zhǔn)中有明確的規(guī)定，需要嚴(yán)格按照規(guī)定要求進(jìn)行。 渣漿泵廠(chǎng)家
What is the difference between flushing and cooling of mechanical seal of slurry pump
(1) flushing of mechanical seal
Flushing and cooling of mechanical seal are auxiliary facilities of mechanical seal. The flushing of the machine seal can be used to reduce the temperature, keep the good lubrication of the seal face, prevent vaporization without dry friction, and keep the seal ring from damage in the presence of solid particles, crystal medium and strong corrosive medium. Therefore, it is necessary to wash and cool the mechanical seal.
There are three washing methods of mechanical seal: self washing, circulation washing and injection washing.
Self flushing is to use the pressure difference generated by the pump itself or the pressure difference generated by the pumping device in the sealed cavity to make the sealed medium form a closed circuit through the sealed cavity to realize flushing. The differential pressure flushing generated by the pump itself is generally introduced into the mechanical seal cavity from the pump outlet for intermediate flushing, and then returned to the pump inlet. If the temperature of the liquid delivered by the pump is high, it can be connected to the cooler in the middle, and then sent to the seal chamber to wash the seal face after cooling.
The flushing of the pumping device is to boost the liquid in the shaft seal cavity through the pumping device, send it to the cooler for cooling, and then send it back to the shaft seal cavity for flushing the machine seal. It can be applied to the boosting device of the pumping device, such as the small impeller, the vortex impeller or the pumping screw. It can be used when the liquid temperature is high.
Circulation flushing is called extra circulation flushing. It circulates the external sealing fluid through a pumping device. The pumping device can be external or a pump device can be added in the sealing chamber. This kind of flushing method is often used on double face or multi face seals. Single face seal is generally not used.
Injection flushing, or external flushing, is to inject another liquid from the outside into the sealing cavity to improve the sealing working conditions. This method is generally used when the transported medium is not suitable for sealing fluid. For example, the conveyed medium contains solid particles or has high viscosity or too high temperature.
(2) cooling of mechanical seal
When conveying high temperature medium, the machine seal shall be cooled. There are two cooling modes: direct cooling and indirect cooling. direct
Cooling, one is the above-mentioned cooling liquid flushing. The other is to put cooling liquid into the gland to cool the static ring. The part outside the sealing chamber is called "quench" or "back cooling". This part of coolant does not return to the pump, but is discharged, so it is often carried out with cold water.
Indirect cooling is to add cooling jacket outside the sealing cavity, as shown in Figure 5-13. The cooling liquid of cooling jacket is generally cold water introduced from outside. The cooling system is usually composed of the cooling of pump bearings and pump feet.
Generally, when the temperature of pump medium is higher than 150 or there is no flushing, or the liquid with low boiling point and high melting point need indirect cooling. Indirect cooling is also generally required in boiler feed pumps.
The cooling pipeline system of the pump is often specified in the pump manual and relevant standards, which shall be carried out in strict accordance with the specified requirements Slurry pump manufacturer
