Function and principle of boiler pump mechanical seal cooling water

Boiler pumps are also known as "boiler feed water circulating pumps". Boiler circulating pump mechanical seal is a general shaft seal type for rotating machinery.Mechanical seal is mainly used for gas, liquid and other kinds of media seal. Gas sealing, such as the sealing of a compressor media shaft. Because the mechanical seal has the characteristics of low leakage and does not require daily maintenance, it has been widely replaced by the gland soft packing seal. The following is a brief introduction to the role and principle of boiler pump mechanical seal cooling water.

1) The role of boiler pump mechanical seal cooling water

1, general mechanical seals or bearings need to cool down, some use external tap water or cooling water jacket, and some boiler feed pumps use internal circulation cooling system, because the structure and material are different, cooling requirements are not the same.

2, the use of heat exchange device, the cold circulating water or hot circulating water, and the need to cool or heat up the material through the heat transfer medium, cold and hot circulating water can be recycled.

3, the use of water fluidity and solubility, to purify the material to be treated, required to be purified material and water is not miscible, but also can quickly settle, and the impurities in the purified material is water-soluble, washing water can also be reused until saturation.

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, so that the bearing temperature rises. In serious cases, it will also burn the bearing. The gap between the 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 boiler circulation pump vibration increases, serious will cause equipment damage, the return water of the sealed water is generally introduced by multi-water sealing pipe.

2) The principle of the boiler pump mechanical sealing cooling water depends on the friction heat generated by the circulation softening water belt and the relative rotation of the static ring, reducing the use temperature and extending the use cycle. In order to reduce this temperature, flushing mechanical seals can also be used in some cases.