Multi stage centrifugal pumps are mainly used for conveying water and physical and chemical properties similar to water. Its biggest advantage is the advanced design of hydraulic model, high efficiency, high energy saving. Inside the pump impeller and the pump shell and the main parts of stainless steel stamping, special channel smooth, bearing, shaft adopt hard alloy with superior service life, avoid pollution two. The maximum temperature of the liquid is not more than 80, which is widely used in mine drainage, factory and city water supply.
In order to ensure the multistage centrifugal pump after the assembly of mechanical seal without leakage, multistage centrifugal pump tightness inspection is essential, but the inspection process is more complex, the following will give more detailed operation method: 1, the central anti static measurement of the length of the pin and pin hole depth to prevent a long, can not be static ring assembly in place. This situation will damage the mechanical seal.
2, check the dynamic ring and the static ring with the gap between the shaft or sleeve, static ring diameter generally large shaft diameter of 1 2mm, the moving ring, in order to ensure the floating, diameter of large shaft diameter of 0.5 1mm, with compensation axis of vibration and deflection, but the gap is not too large, otherwise it would be dynamic ring seal ring is clipped into the damaged mechanical seal function.
3, measuring the size of dynamic ring, static ring sealing surface. This data is used to verify the movement of the radial width of the ring, when using different friction materials, hard surface friction than the radial width of 1 soft 3mm, otherwise easy to cause the end edges embedded in the soft material and hard material surface.
4, measuring the length of the compensation spring is changing. The change of the spring performance will directly affect the mechanical seal face pressure. In general, the spring will be shortened after a long run, the mechanical seal spring on the moving ring will be due to the centrifugal force and deformation.