Centrifugal pump Centrifugal pump mechanical seals are very demanding and precise components. If improperly assembled, it will affect the sealing performance. To properly install, you must pay attention to the following points:
Installation and technical requirements for mechanical seals for centrifugal pumps
1. Technical requirements for the cooperation of the machine, pump and mechanical seal:
a. The maximum bending of the shaft shall not exceed 0.05mm.
b. All parts in the parts are in accordance with the requirements of the drawings. When tightening the gland, it should be carried out after the coupling is straightened, and the pressing screws should be tightened to prevent the flange surface from being skewed.
c. The amount of vibration of the shaft at the installation mechanical seal shall not exceed 0.1mm.c. The axial movement of the shaft shall not be greater than 0.5mm.
d. Install the mechanical seal part shaft manufacturing tolerance is h8, finish 1.6.
e. Install the end of the shaft (sleeve) of the moving ring seal and the end of the sealing gland (or casing) of the quiet ring seal should be chamfered and polished.
2, the installation requirements of the pump mechanical seal, the moving ring must ensure that the moving ring can move flexibly on the shaft.
Cooling and flushing of centrifugal pumps with mechanical seals
1. The first type of cooling consists of the clean medium delivered by the outlet or high pressure end of the pump, directly flushing the sealing end face and then entering the pump cavity. The frictional tropical end of the friction end face is cooled by the continuous circulation of the medium.
2. The second cooling method adds a cooling water jacket to the back of the stationary ring on the basis of the first cooling mode, the cooling effect is improved and the leaked liquid can be washed and collected. When the sealing medium temperature is >150 ° C In addition to cooling in the cooling water jacket by cooling water and static ring back cooling, forced cooling should be taken. The clean medium from the pump outlet should be cooled to 50 ° C in advance through the heat exchanger and then enter the sealed chamber for cooling and cooling. The most effective one.
3. Pipeline centrifugal pump If the medium contains particles or impurities, it must be filtered. Put the normal temperature clean rinse into the sealed cavity.
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