Oil film mechanical seal application-

Oil film mechanical seal application

　2018-09-29　　

Application of oil film mechanical seal:

With the continuous development of centrifugal compressors in the direction of high temperature, high speed and high pressure, higher requirements are put forward for fluid dynamic seals, and as the main type of shaft end seals for centrifugal compressors-contact wet running mechanical seals It has been difficult to meet the requirements of mechanical seal performance. In recent years, the spiral groove fluid dynamic pressure seal has been successfully applied in centrifugal compressors. 204B mechanical seal

FTL140-41 centrifugal refrigeration compressor uses Freon (F-12) as a refrigerant, through compression, condensation,

Evaporation cycle produces -81℃ calcium chloride brine, pumps the brine into the jacket of the polymerization kettle, takes away the heat of the butadiene reaction in the kettle, and improves the conversion rate of the product. The machine originally used a relative double end face mechanical seal, and as a result, leakage often occurred, causing the unit to fail to operate normally. The longest operating time was one month, and the shortest was only 7 days, which seriously affected production. After modification, the spiral groove oil film seal is selected, and its structure is shown in Figure 4-11.

Figure 4-11 Double-end spiral groove oil film seal

The mechanical seal has double end faces, adopts the common end face of the moving ring and the relative installation method. Both ends of the moving ring are engraved with spiral grooves, the material is cemented carbide YG6, and the dimensions of the end surfaces are shown in Figure 4-11(b); the static ring material is graphite. The original sealed flushing system is an external flushing forced closed circulation system. In order to reduce the resistance of the oil circuit, remove frictional heat and stirring heat in time, and improve the flushing effect. Rinse amount. In addition, in order to make the constant pressure tank supply oil to the flushing system stably, a nitrogen regulator with instrument indication is added to ensure that the upper part of the constant pressure tank has 0.25 MPa nitrogen for pressure maintenance, avoiding the system pressure being higher than the oil pressure of the constant pressure tank. Make the system seal oil back to the constant pressure tank. Therefore, it is necessary to ensure that the unit is supplied with nitrogen at a constant pressure. Practice has proved that FTL140-41 centrifugal refrigeration compressors have achieved good results after using spiral groove oil film seals.　　961.html,

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