What Is The Working Principle Of Fluoroplastic Centrifugal Pump?

(1) The impeller is driven by the pump shaft to rotate, doing work on the fluid between the blades. The fluid is thrown from the center of the impeller to the periphery under the action of centrifugal force. When the fluid reaches the periphery of the impeller, the flow rate is very high.
(2) The pump casing collects the liquid thrown from between the blades. These liquids flow in the casing along the direction of the gradually expanding volute-shaped channel, converting the kinetic energy of the fluid into static pressure energy, reducing energy loss. Therefore, the role of the pump casing is not only to collect liquid, but also an energy conversion device.
(3) Liquid suction principle: relying on the high-speed rotation of the impeller, the liquid in the center of the impeller is forced to be thrown away at a very high speed, thereby forming a low pressure in the center of the impeller, and the liquid in the low-level tank is continuously sucked up. Air binding phenomenon: If the casing of the centrifugal pump is filled with gas before starting, the gas in the center of the impeller cannot form a large enough vacuum at that place after starting, so the liquid in the tank cannot be sucked up. This phenomenon is called air binding. To prevent the occurrence of air binding, the space inside the pump casing should be filled with external liquid before starting the centrifugal pump. This operation is called priming the pump. In order to prevent the liquid poured into the pump casing from flowing into the low-level tank due to gravity, a check valve (bottom valve) is installed at the inlet of the pump suction pipe; if the pump is located below the liquid level in the tank, there is no need to prime the pump when starting.
(4) A guide wheel is installed on the outer periphery of the impeller to increase the efficiency of liquid energy conversion in the pump. The guide wheel is a fixed ring with blades located on the outer periphery of the impeller. The bending direction of these blades is opposite to the bending direction of the impeller blades, and its bending angle is just in line with the direction of liquid flowing out of the impeller, guiding the liquid to change direction smoothly in the pump casing channel, minimizing energy loss and converting dynamic pressure energy into static pressure energy.
(5) The balancing hole on the rear cover eliminates axial thrust. The pressure of the liquid leaving the periphery of the impeller is already high, and some of it will seep to the rear side of the impeller rear cover, while the liquid inlet on the front side of the impeller is low pressure, thus generating an axial thrust that pushes the impeller to the pump inlet side. This can easily cause wear at the contact between the impeller and the pump casing, and in severe cases, vibration. The balance hole allows part of the high-pressure liquid to leak into the low-pressure area, reducing the pressure difference before and after the impeller. However, this will also reduce the pump efficiency.
(6) The shaft seal device ensures the normal and efficient operation of the centrifugal pump. When the centrifugal pump is working, the pump shaft rotates while the shell does not move. If the annular gap between them is not sealed or sealed poorly, the outside air will penetrate into the low-pressure area in the center of the impeller, reducing the flow rate and efficiency of the pump. In severe cases, the flow rate is zero - air binding. Usually, mechanical seals or packing seals can be used to achieve sealing between the shaft and the shell.