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The Characteristics Of The Pump Seal
Aug 09, 2017


The pump seal is sealed by a movable ring fixed to the shaft and a stationary ring fixed to the pump housing and tightly approaching the two end faces (slid by the spring force).

In the pump seal, the leaked return to the Golubiev reverse spiral groove lift pressure on the movable ring seat is forced through the passageway into the gap of the movable ring and the static ring to take the frictional heat and Flush bubbles and so on. Pressure sealing water on the one hand to withstand high pressure discharge water, Pump Seal on the other hand channeling between the dynamic and static ring, to maintain a layer of mobile film, so that the static and dynamic ring does not touch. The flow membrane is very thin, due to the role of high pressure water, Pump Seal so the amount of water leakage.

Problems and Analysis in Running

Water pump seal system welding quality difference seriously affect the safety of the feed pump, sea power 200MW feed pump pump seal liquid temperature design for the 80 ℃ alarm, 90 ℃ jump pump. Pump Seal When the operation of the pipeline slightly leaks the pump seal liquid temperature slowly increased (due to the heat exchanger through the pump seal fluid to reduce, or the pump seal fluid can not be a good cooling); when the pipeline is a serious leak to the pump seal liquid temperature Rise. Pump Seal These are so that the pump seal ring and static ring and paste and the surface is not a good cooling, so that the static and dynamic overheating and damage. Running several times due to the pump seal pipe leakage caused by the feed pump trip, but also increased the wear of the pump seal. So the pump seal system of the welding quality of the pipeline put forward higher requirements.

Effect of Water Quality on Water Pump Seal. As the water pump sealing device on the water quality requirements are higher, when the water quality deterioration, due to the pump sealing device circulation pipe system is relatively small, so that the pump seal device quickly blocked the pump seal liquid temperature rise; Pump Seal when the pump at low speed , When the water quality deteriorated, due to high Gulubiev (Golubiev) reverse spiral groove to enhance the pressure is low, so that impurities can not be taken away in time, Pump Seal resulting in impurity deposition in the pump seal and face, scratches the pump seal static ring The paste and the surface, so that the pump seal leakage. It is therefore necessary to strengthen the supervision of the unit's start-up and normal operation of the water quality

Effect of Operation Mode on Pump Seal Device.

When the unit is in the regular load adjustment, so that the pump is in the variable state or the pump is often in the start and stop state, resulting in the pump pump shaft momentary movement, so that the water pump static and static between the paste and the surface gap is too small , Not enough to form a flow membrane, Pump Seal resulting in static friction of the static and dynamic ring, so that the pump seal device damage. Sea # 42 water pump has been due to the balance of the pump itself damage, so that thrust bearing wear, leading to mechanical seal leakage. So in operation to minimize the adjustment of the pump group. Pump Seal To prevent damage to the pump seal.

When the pump is in the normal standby state, the pump is still at this time. Since the pump must be put into the warm pump device, when the water pump seal device into the cooling water, Pump Seal but because the pump is not rotating, so the water pump seal device can not flow, so the pump seal device graphite ring (static Ring) is at a high temperature of 100 ° C or higher, and when the standby pump is immediately loaded with a load, the water flowing above 100 ° C or more flows through the cooler and becomes a graphite ring of 30 ° C or higher to flow through the graphite ring of the pump seal The graphite ring is cold and cracked, causing the pump seal to leak. So the pump in the normal standby can be added when a small circulation pump to pump the water flow of the device to avoid the occurrence of the above phenomenon.