Mechanical seal of DG type boiler feed pump

Zhongxing Shun Skeleton Oil Seal and O-Ring bring the function of DG type boiler feed pump mechanical Seal Sealing water

In order to protect the sealing surfaces of the dynamic and static rings, the mechanical seal of the DG type boiler feed pump needs to be cooled. There are two forms of cooling. One is that the fluid in the pump leaks to the mechanical seal. This part of the sealing cooling water is relatively It is stagnant water. In order to keep its temperature within a certain range, it must be cooled by an external cooler. The moving ring is made in the form of a screw pump to provide circulating cooling power for this part of the sealed cooling water.

DG type boiler feed pump mechanical seal sealing water function:

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, resulting in a large loss of working fluid; at the same time, the high-temperature feed water will pass through the pump. The metal of the shaft and pump body transfers heat to the bearing, which increases the bearing temperature. In severe 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 will be destroyed, and friction between the shaft and the seal is likely to occur. The vibration of the pump increases, which will cause equipment damage in severe cases. The return water of the sealing water is generally introduced into the condenser using a multi-stage water sealing pipe.

2. The water in the upper water pump is water with a certain temperature, and 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 bearing temperature. 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 upper water pump passes through the seal, it still has a certain pressure. In order to prevent the water in the feed pump from leaking out through the gap between the shaft and the seal, it is removed from the outlet of the condensate pump or demineralized water. The main pipe leads to the water source as the sealing 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.