May I ask what the role of the high-pressure boiler water pump is in sealing these two channels of water?
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This post was last posted by * Banya2009 edited the picture on 2017-9-13 23:08. This is a picture of the seal of a high-pressure boiler water pump. 3 is the cooling water, 1.2 is the boiler water as the medium in the pump, and 4 is the jacketed pipe that is cooled by the cooling water after the boiler water is led out. It was not photographed. Excuse me: 1. Where does the 3 cooling water go for cooling? 2. Is the flow direction of 1.2 from 1 to 2 or from 2 to 1? Where is it removed from the machine seal? Since it is cooled, why do we need to introduce cooling water 3
It should be mechanical seal cooling and lubricating oil cooling. You can judge by looking at the direction of the main pipe connected to the two lines to see whether water is entering or returning.
3 and 2 should be the inlet and outlet pipes for machine seal flushing water, usually from the bottom to the top! 1 should be the pump cover insulation or cooling pipe!
From the picture, pipe 1 should not be a machine-sealed cooling pipe. Pipes 2 and 3 are for machine seal cooling, 3 in and 2 out.
See from the picture: 3 should be the machine seal cooling water (enters the outside of the machine seal from 3, and flows out from the leakage hole below. Natural flow from the drainage pipe below) ； 1 and 2 are the self-flushing water of the mechanical seal (water is led from the high-pressure end of the pump chamber, and then rinsed and cooled by the mechanical seal after cooling). Since you don’t have a drawing of the mechanical seal, I don’t know if your mechanical seal has a pumping ring, which is equivalent to a small impeller. Only according to the pumping ring and the drawing can we determine who enters and who exits 1 and 2.
You can determine the inlet and outlet of the machine seal flushing by looking at the direction of rotation of the pump.
For a high-pressure boiler feed water pump with a BB5 structure, the mechanical seal flushing plan should be Plan 23+K. 3 is cooling water, which usually enters the water jacket of the pump end cover. There is a certain amount of heat transfer between the pump end cover and the mechanical seal seat, which reduces heat transfer to the mechanical seal. Without this cooling water, the static seal O-ring of the mechanical seal is prone to aging and failure. 1 and 2 are flushing fluids. After the high-temperature medium is led out for cooling, it is then fed into the mechanical seal friction pair. A layer of water film will be formed in the middle of the friction pair, and at the same time, the heat of the friction pair will be taken away. As for whether it is 1 to 2 or 2 to 1, feel it during operation. The water cooler between 1 and 2 is particularly important when the high temperature flows to the low temperature. If possible, it is best to use softened water and clean the jacket scale regularly. When the cooling effect is not good, the mechanical seal life will decrease and the leakage rate will increase.
What the person above said is correct, the flushing fluid is 1 to 2, and 2 has a thermometer to check the temperature after cooling. If the meter is at the high temperature end 1, it is meaningless. Don't understand 2 points: 1. This place is the jacket cooling water. Why do the cooling water and the medium flow in the same direction instead of in opposite directions? In general water coolers, the medium and cooling water flow in opposite directions. What is the purpose of this setting? 2. Should the mechanical seal flushing plan be Plan23+K? Is there any information on this flushing plan?