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Sh-type centrifugal pump is a commonly used pump, the structure of a certain representation for other pump overhaul for reference. Regardless of the type of pump, it is important to understand the condition of the equipment before overhauling it. It is important to know which parts are likely to be damaged, to be replaced during overhauls, and to have spare parts prepared in advance. Before stopping the pump, conduct a detailed inspection of the equipment. After the maintenance work procedures. Before the pump is overhauled, it is necessary to check whether the safety measures are complete and whether the pressure inside the pump is on the net. Centrifugal pump overhaul in order, that is, demolition, inspection, assembly three big not. Due to the different pump structure, the specific program content is not the same. For 48Sh-22-type pump, the work steps are as follows: I.Sh-type centrifugal pump overall removal (1) the pump housing demolition coupling pin, the pump and the motor from. Remove the horizontal joint bolts and pins to separate the pump cover from the lower pump body. And remove the packing gland. Decompose piping with connections to the system (eg air pipes, sealed water pipes). Decomposition pipe head with cloth, to prevent falling into debris. (2) Hanging pump cover After the above work 1 is completed and checked, the pump cover can be lifted. Be steady when lifting, be careful not to get stuck with his parts. (3) hanging rotor to the ends of the bearings apart, remove the bearing and the bearing. Pull the oil ring to the two sides of the bottom bearing, which is not to be taken out of the bottom bearing under lifting. Wire rope wear at both ends of the rotor (packing gland at) lifting, to level safe. Two.Sh centrifugal pump inspection and cleaning (1) pump body bearing inspection. See if there is wear and tear, burns; Wujin is born (the old bearing as long as the hand by a click of black gold, the oil will be squeezed out from the brim of the seam). If you can not continue to use to be new. New bearing also have to check the case of bodiless, soak in kerosene check. Born area not more than 20%. Bearing body to be cleaned, and check the oil window is transparent. Pump cooling water, sealed water channel is blocked, with or without leakage, should remain open and intact. Pump cover and pump body clean surface. No combination of surface, asbestos mat to be complete, if damaged, according to the original thickness of the replacement. (2) Check the rotor part of the impeller wear, cavitation, and check for cracks. If you can continue to use it without having to remove from the shaft, because it is generally difficult to disassemble. If you need to remove the non-must use special tools to disassemble and remove the heating. After removing the impeller, the shaft should be clean, side axle curvature of the bay. Bush often friction with the filler, especially when the sand with water is particularly serious, so the general situation should be replaced. Make a protective ring inlaid on the water wheel (usually a large pump impeller inlaid with a protective ring, so the re-allocation of the old should be removed). Impeller and seal ring with the gap selected by the table. Check the single row radial ball bearings 20 is qualified, the inspection methods are as follows: â‘ rolling body and raceway surface can not have spots, holes, dents, peeling, peeling phenomenon. â‘¡ rotating flexible, hand rotation should be smooth, and gradually slow down and stop, can not suddenly stop, can not have vibration. â‘¢ isolated frame and the inner and outer rings should be the same gap, you can use the hand to promote radial isolation test rack. â‘£ clearance appropriate, with the amount of lead wire method side volume.