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In order to prevent displacement of the rotary face,transmission ring and fasteners, the mechanical seal will be fixed on the shaft sleeve with fastening screws when installing the mechanical seal.
With the eclipse of time,the components will still have subtle displacements, which will cause the components that are displaced to rub against and damage each other ; This interaction force is mainly concentrated at the contact position.The mechanical seal will easily be deformed or even fall off. In addition, if displacement and contact friction between the sleeve and the rotary face occurs and maintains over time, it will cause 0.5mm to 0.7mm scratches on the surfaces of the sleeve and the rotary face, which is difficult to find during inspection, thus often cannot be resolved in time.
In order to fundamentally solve this problem, first of all，it is necessary to ensure that the performance of the material used in the sleeve and the smoothness of its surface meet particular requirements. Specifically, the surface roughness of the shaft sleeve should be less than or equal to Ra3.2, and the material should be alloy steel 1Cr13 or 2Cr13. It is best to choose 1Cr18Ni9 Ti with excellent wear resistance and plasticity. For high temperature and high pressure boiler circulating pumps and feedwater pump shafts,the sleeve should be made of high temperature resistant alloy steel material, such as 24crMov.
At the same time, in order to ensure the sealing effect of the mechanical seal, the shape and position tolerances and dimensional tolerances of the shaft sleeve must be strictly controlled.
With the eclipse of time,the components will still have subtle displacements, which will cause the components that are displaced to rub against and damage each other ; This interaction force is mainly concentrated at the contact position.The mechanical seal will easily be deformed or even fall off. In addition, if displacement and contact friction between the sleeve and the rotary face occurs and maintains over time, it will cause 0.5mm to 0.7mm scratches on the surfaces of the sleeve and the rotary face, which is difficult to find during inspection, thus often cannot be resolved in time.
In order to fundamentally solve this problem, first of all，it is necessary to ensure that the performance of the material used in the sleeve and the smoothness of its surface meet particular requirements. Specifically, the surface roughness of the shaft sleeve should be less than or equal to Ra3.2, and the material should be alloy steel 1Cr13 or 2Cr13. It is best to choose 1Cr18Ni9 Ti with excellent wear resistance and plasticity. For high temperature and high pressure boiler circulating pumps and feedwater pump shafts,the sleeve should be made of high temperature resistant alloy steel material, such as 24crMov.
At the same time, in order to ensure the sealing effect of the mechanical seal, the shape and position tolerances and dimensional tolerances of the shaft sleeve must be strictly controlled.
