The mechanical seal of the boiler multi-stage water pump needs to be cooled to protect the sealing surfaces of the dynamic and static rings. There are two types of cooling. One type of pump fluid leaks to the mechanical seal. This part of the sealed cooling water is relatively speaking It is dead water. In order to keep the temperature within a certain range, it must be cooled by an external cooler. The moving ring is made into a spiral pump to provide circulating cooling power for this part of the sealed cooling water.
The role of the mechanical seal of the boiler multi-stage water pump:
1. 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, causing a large amount of working fluid loss; at the same time, the high temperature feed water will pass through the pump The shaft and pump body metal transfer heat to the bearing to raise the temperature of the bearing. In severe cases, the bearing will be burnt; 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 also destroyed, and the shaft and the seal are likely to be rubbed. The vibration of the water pump increases, which will cause damage to the equipment in severe cases. The return water of the sealing water is generally introduced into the condenser through a multi-stage water sealing pipe.
2. The water in the upper water pump is water with a certain temperature. The high temperature water will transfer heat to the bearing through the pump shaft or the metal of the pump body, which will increase the temperature of the bearing. In order to control the heat transfer, the sealing water also plays a cooling role.
3. Although the high-pressure water in the multi-stage water pump passes through the seals, it still has a certain pressure. In order to prevent the water in the feed water pump from leaking through the gap between the shaft and the seal, it is removed from the condensate pump outlet or demineralized water The main pipe uses the water source as the sealed water.
There is also a direct external cooling water source, which flows into the pump after cooling, and flows away with the fluid in the pump.
