Introduction to chemical corrosion-resistant centrifugal pump start and use the matters needing attention

Before starting the centrifugal pump must ensure that two points: 1, will be full of water in the pump shell, the purpose is to form a vacuum; 2, must be closed on the outlet pipe gate valve, so the pump not form a flow, can reduce motor starting current, conducive to the smooth operation of the pump and start with the pump start smoothly should slowly open the gate in time. Before starting the one, in the pump, pump shell filled with liquid to be delivered; Starts, by axis high-speed rotating impeller, the blade between the liquid must also along with the rotation. Under the action of centrifugal force, the liquid from the impeller center was thrown to the outer edge and gain energy, leaving the impeller outer edge at high speed into the volute water pump shell. Centrifugal pump is to rely on form the vacuum suction lift water impeller centrifugal force, so the centrifugal pump starts, must first put the outlet valve closed, irrigation. Water level more than impeller parts, to vent air from centrifugal pump, can only be started, after start-up, vacuum formed around the impeller, sucked the water up, it can automatically open, the water. Therefore, you must close the outlet valve. Second, the centrifugal pump is a kind of vane pump, rely on the rotation of the impeller in the rotation process, because of the blade and liquid interaction, blade to mechanical energy to the liquid, the liquid pressure will increase, reach the purpose of conveying liquid. A centrifugal pump has the following characteristics: (work 1) Centrifugal pump in the discharge line valve closed, vortex pump and axial flow pump start under the valve fully open, to reduce the starting power. ( 2) Under a certain speed centrifugal pump pump lift generated by a finite value. Working point flow and shaft power depends on the device connected to the pump system ( A poor, pressure difference, and line loss) 。 Head change according to the traffic. ( 3) The working stability, continuous, flow and pressure pulsation. ( 4) There is no self-priming ability, will need to pump to fill liquid or the pipeline into vacuum before they can begin to work. Liquid in the volute, due to the widening of flow deceleration, liquid flow to the outer edge by the impeller center, in the center of the impeller has formed a certain vacuum, because of the holding tank liquid level at the top of the pressure is greater than the entrance to pump pressure, the liquid was continuous pressure into the impeller. Can and will be part of the kinetic energy into static pressure to high pressure into the discharge pipe, sent to the need to place. Visible, as long as constantly rotating impeller, liquid will be overtaken by suction and discharge. 3, 1, other centrifugal pump start-up vortex pump start-up characteristics & ndash; — Full open valve to start the vortex water pump shaft power when zero flow conditions, for 130% ~ 190% of the rated shaft power, and so are similar to those of axial flow water pump, vortex pump start characteristics should be a big traffic start ( The full open valve to start) 。 2, large axial-flow pump start-up characteristics & ndash; — Full open valve to start the axial flow pump shaft power when working condition of zero flow, rated shaft power of 140% ~ 200%, high flow rate when the power is small, so small starting current, shaft power start characteristics should be a big traffic start ( The full open valve to start) 。 3, the characteristics of mixed flow pump start, & ndash; — Full open valve to start the mixed flow pump shaft power when working condition of zero flow between the above two kinds of pump, is 100% ~ 130% of rated power, so the starting characteristics of mixed flow pump also should be between the above two kinds of pumps, fully open valve.
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