The centrifugal principle of centrifugal pump

the performance of the inertial centrifugal is actually object, such as water droplets on the umbrella, umbrella slowly rotating, water droplets turn will follow the umbrella, it is because the umbrella with droplets of friction as to the result of the centripetal force of the water droplets. But if the umbrella rotational speed, the friction force is not enough to make water droplets to do circular motion, then the water will be separated from the umbrella to the outer edge sport, like to use a rope to pull the rocks do circular motion, if too fast, the rope will disconnect, stones will fly out. This is what is called a centrifuge.
the main working principle of centrifugal pump
( ） Impeller is pump drive shaft rotation, work on the blade between the fluid and fluid the effect of the centrifugal force, thrown by the impeller center to the periphery. When the fluid reaches the impeller peripheral velocity is very high.
　　（ ） Collected from each blade pump shell thrown between liquid, the liquid in the shell channel along the spiral shape gradually expand the direction, can make the fluid kinetic energy is converted to static pressure, reduce the energy loss. So the action of the pump housing is not only collected liquid, it is an energy conversion device.
　　（ ） Liquid suction on the principle that rely on high-speed rotating impeller, forcing the center of the impeller liquid be discarded at a high speed, so as to form a low pressure in the center of the impeller, the low trough in the liquid, have been continuously on the absorption.
gas bound phenomenon: if a centrifugal pump shell filled with gas, before initiating the impeller center since the start when the gas is not in the vacuum forming large enough, so that liquid in the tank can't be sucked. This phenomenon is called chi bound.
to prevent gas bound, the phenomena of centrifugal pump will start to use the foreign liquid pump shell space filling. This step is called irrigation pump operation. To prevent injection pump shell liquid by gravity into the low slot, at the entrance of the pump suction line is equipped with pneumatic valve non-return ( Hand dynamic valve) ； If the position of the pump is lower than the slot liquid surface, the startup without irrigation pump.
　　（ ） Liquid in the pump impeller peripheral install idler pulley, high energy conversion efficiency. Roller is fixed with a leaf in impeller peripheral ring. The bending direction of the blade and impeller blade bending in the opposite direction, the bending Angle is corresponding to the direction of liquid flow from the impeller, guide the liquid in the pump shell channel smoothly change direction, minimize the energy losses, dynamic pressure can be converted to static pressure of high efficiency.
　　（ ） HouGaiBan eliminate axial thrust balance hole. Leave the impeller peripheral liquid pressure is high, has a part to the impeller HouGaiBan behind, can enter and impeller liquid for low pressure at the entrance of the side, creating a push pump impeller inlet side of the axial thrust. It is easy to cause the impeller and pump casing wear contacts, serious when still can produce vibration. Balance hole part of high pressure liquid leak to the low pressure area, reduce the pressure difference before and after impeller. But it will be the lower pump efficiency.
( ） Shaft sealing device, normal and efficient operation of centrifugal pump. Centrifugal pump is the pump shaft rotation and shell at work, during which the ring gap if not under seal or the seal is not good, the surrounding air will penetrate into the center of the impeller low pressure area, decrease the flow rate, efficiency of pump. Serious when flow is zero - — Air bound. Usually, mechanical seals or packing seal can be used to seal between shaft and shell.