Used In The Feed Water Pump Mechanical Seals On

1. The principle of mechanical seals

1. The principle of mechanical seals

Mechanical seal is not packing seals. It is secured to the shaft by the ring and fixed to the pump casing on the stationary ring and the two tight end close (by the spring force sliding push) to seal. In the mechanical seals, the leak back to the water by the ring seat cover on the high Lupi Fu (Golubiev) reverse spiral groove to enhance the pressure, through channels and static forced into the ring to ring in the gap, to take away heat and friction Bubble wash away impurities. Withstand the high pressure seal water pressure while the water escape, the other coming into static and dynamic link between maintaining a layer of mobile membrane, so that movement does not touch the torus. Thin film flow, due to the role of high-pressure water, so very little escape of water.

2. Run the process and analysis of problems

Mechanical seals the poor quality of welding pipe system to pump serious impact on the safety of the sea 200MW electricity to pump mechanical seals design is 80 liquid temperature alarm, 90 jump pump. When running a small leak in the pipe line to seal fluid temperature increases slowly (because of fluid through heat exchangers to reduce the mechanical seals, mechanical seals or liquid cooling may not be good); when piping a serious leak to seal liquid temperature rapidly increased. These are so mechanical seals ring and static ring and the front and side are not very good cooling, overheating and damage to static ring. Often occurred on leakage due to mechanical seals piping leading to the pump trip, but also increased the wear of mechanical seals. Therefore, the mechanical seals welding quality control department has put forward higher requirements.

Water quality impact on the mechanical seals. As the mechanical seals on the water quality are higher, and when the water quality deterioration, due to cyclic mechanical seals piping quite thin, so that rapid mechanical seals easy to plug the resulting fluid temperature; when a pump running at low speed When the water quality deterioration, due to high Lupi Fu (Golubiev) reverse spiral grooves to enhance the lower pressure, so that impurities can not be taken away by the water in a timely manner, resulting in impurities deposited on the mechanical seals paste and surface Department, scratch mechanical seals ring movement The front and side, so that mechanical seals leakage. Hence the need to strengthen Kai down and running unit water quality monitoring

Operation of the mechanical seals.

. When the unit load in the regular adjustment to changing conditions to the pump in the state or to the pump start and stop frequently at the state, leading to the pump shaft ran the moment, so that movement to the pump ring gap between the paste and the surface had small to form a mobile film movement caused by dry friction ring, so that mechanical seals damage. Shanghai Electric # 42 to the pump itself has emerged as the balance of pump damage and the thrust bearing wear, resulting in mechanical seals leakage. Therefore, the operation to minimize the significant reduction from the pump. Mechanical seals to prevent damage.

. When a pump is in normal standby mode, then the pump still. Since the pump must be put into warm standby pump system, although this time into the mechanical seals cooling water, but not rotation pump, mechanical sealing devices, therefore the water can not flow, so the graphite mechanical seals ring (static Central) at temperatures above 100 , and when the standby pump in conjunction with a load of Kai immediately, 100 above water after a sudden movement up through the cooler into the back above 30 mechanical seals flow through the graphite ring, so that graphite ring suddenly cold and crack, leading to mechanical seals leakage. Therefore, in normal standby pump when dissecting a small circulation pump of mechanical seals up the water flow to avoid the phenomenon.

by: lucy00123

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