Boiler feed pump mechanical seal cooling water function

The boiler feed pump mechanical seal is the type of shaft seal commonly used for rotating machinery. Mechanical seal is mainly used for gas, liquid and other media seal, such as pump, reactor and so on; It is also used for gas sealing, such as the sealing of the compressor medium shaft. Mechanical seals are characterized by low leakage and no need for daily maintenance.

The principle of the boiler feed pump mechanical sealing cooling water: the use of circulating softened water to take away the friction heat generated by the relative rotation of the dynamic and static rings, reduce the use temperature and extend the use cycle. In order to reduce this temperature, some occasions can also be used to flush (such as self-flushing) mechanical seals.

Boiler feed pump mechanical seal cooling water function:

1) Generally in the mechanical seal or bearing need to cool down, there are external tap water or cooling water jacket, some pumps use internal circulation cooling system, various pump structure, material is different, cooling requirements are not the same, do not use the machine seal there is no need to cool, wash.

2) Heat exchange, that is, the use of heat exchange device, the cold or hot circulating water and the material that needs to be cooled or heated through the heat conduction medium for heat exchange, cold and hot water can be recycled.

3) Washing, using the fluidity and solubility of water, the purification treatment of the treated material requires that the purified material is not miscible with water, and can quickly settle, and the impurities in the purified material are water-soluble, and the washing water can be reused until saturated.

When the sealing water passes through the seal, the water forms a water film between the shaft and the seal to prevent the gap between the shaft and the seal from leaking out here, resulting in a large amount of working fluid loss; At the same time, the high temperature water supply will transfer heat to the bearing through the pump shaft and the pump body metal to increase the bearing temperature. In serious cases, the bearing will be burned; The gap between the high-speed rotating shaft and the seal is very small, when the sealing water is lost, the water film here is destroyed, the shaft and the seal are likely to friction, so that the vibration of the pump increases, and the equipment is damaged in serious cases. The return water of the sealed water is generally introduced into the condenser by multi-water sealing pipe.