The first cause of damage to the mechanical seal of the centrifugal pump: mechanical damage
1. The surface roughness of the centrifugal pump has not reached the product standard, or the centrifugal pump has a long time working light, resulting in a scratch on the surface of the centrifugal pump.
2, the conveying medium of the centrifugal pump has sundries, such as larger particles. When the centrifugal pump is running, the medium is in high speed movement, causing damage and damage to the surface surface.
3. The pressure and deformation of the cap and the inhomogeneous pretightening force
4. The spring condenses and stops because the medium is cold.
5, the actual output of the centrifugal pump is small, so that a large number of media circulate in the pump, the heat accumulates and causes the medium gasification.
6, the selection of the sealing ring is wrong. We choose cemented carbide, engineering ceramics, graphite and other brittle material sealing rings. Sometimes there will be radial cracks on the ends, causing the components to wear rapidly.
7, the pressure in the pump increases sharply, causing the seal damage, which may be caused by the centrifugal pump or the phenomenon of cavitation erosion.
8, the centrifugal pump has not been used for a long time, and there is no manual impeller in the case of use again. It may destroy the seal because of adhesion.
9, the spring is too tight, which causes the seal end face to wear out quickly and failure.
10, the tightness of the ring seal ring will cause the spring spring to be damaged by excessive fatigue, accelerate the wear between the sealing ring and the shaft sleeve, and make the seal fail.
11. Because of the poor coaxiality of the transmission parts, the end face is rubbed because of the sloshing in the process of operation, resulting in the vaporization of the end face and the overheating wear.
12, centrifugal pump empty or sealing water pipe fall off, so that the cover is in dry grinding state, causing the seal damage of the centrifugal pump.
13. When the centrifugal pump is installed or overhauled, the fastening screw is deflected to cause the seal failure.
Second reasons for damage of mechanical seal of centrifugal pump: heat damage damage
1, the seal face is caused by overheating, resulting in a lot of indentation, causing serious wear to damage the surface.
2, the high temperature causes the sealing parts of the centrifugal pump to be aging, cracking and deforming, so that the sealing force of the seal face is insufficient and leaks.
Third major causes of damage to the mechanical seal of the centrifugal pump: corrosive damage.
1. The sealing parts are washed by corrosive medium for a long time, causing the seal damage.
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