The pump is widely used in urban high-rise building water supply, fire pipeline pressurization, HVAC hot and cold water circulation, long-distance water and the production process of circulating pressurized transport , Now to introduce Xiaobian will demolition of the vertical pipe centrifugal pump the main working principle of it. (1) The impeller is driven by the pump shaft to rotate, and the fluid located between the blades performs work. The fluid is subjected to centrifugal force and thrown to the periphery by the center of the impeller. When the fluid reaches the periphery of the impeller, the flow rate is very high. (2) The pump housing collects liquid that is thrown from the vanes and flows in the direction of the gradual enlargement of the volute-shaped passage in the housing to convert the kinetic energy of the fluid into static pressure energy and reduce the energy loss. Therefore, the role of the pump casing is not only to pool the liquid, it is more an energy conversion device. (3) Principle of Liquid Absorption: The high-speed rotation of the impeller forces the liquid in the center of the impeller to be thrown away at a high speed, so that a low pressure is formed in the center of the impeller. Therefore, the liquid in the lower tank is continuously sucked up. Gas-bound phenomenon Gas-tied phenomenon: If the centrifugal pump in the shell before the start is full of gas, then start the impeller center gas is thrown there can not be formed in a large enough vacuum, so tank liquid can not be sucked up. This phenomenon is called gas binding. In order to prevent the phenomenon of gas binding, centrifugal pump should be filled with foreign liquid to fill the space before pump starts. This step is called filling pump. In order to prevent the liquid poured into the pump casing due to gravity flow into the lower slot, the pump inlet pipe at the inlet with check valve (bottom valve); if the pump position below the tank surface, then start without irrigation Pump. (4) The outer circumference of the impeller to install the guide wheel, so that the pump liquid energy conversion efficiency. The guide wheel is a fixed, bladed ring located on the periphery of the impeller. The bending direction of these blades is opposite to the bending direction of the impeller blades, the bending angle of which coincides with the direction that the liquid flows out from the impeller, guiding the liquid to change direction smoothly in the pump casing channel, minimizing the energy loss and transforming dynamic pressure energy into static High efficiency of pressure energy. (5) balance hole on the rear cover to eliminate axial thrust. The pressure of the liquid leaving the periphery of the impeller is already high and some of the liquid will seep to the rear of the impeller rear cover and the liquid inlet at the front of the impeller is under pressure and thus produces an axial thrust pushing the impeller to the pump inlet side. This easily causes the impeller and the pump housing contact wear, severe vibration will occur. The balance hole leaks part of the high-pressure liquid to the low pressure area to reduce the pressure difference around the impeller. However, this also leads to a reduction of the pump efficiency. (6) shaft seal device to ensure normal and efficient centrifugal pump. Centrifugal pump in the work of the pump shaft rotation and the shell does not move, during which if the ring gap is not to be sealed or seal is not good, the outside air will infiltrate the low pressure area of ​​the impeller center, so that the pump flow, efficiency decreased. Serious when the flow is zero - gas tied. In general, a mechanical seal or a packing seal can be used to achieve a seal between the shaft and the shell. Centrifugal is the manifestation of the inertia of the object. For example, drops of water on an umbrella, when the umbrella slowly turns, the drops of water will follow the umbrella. This is because the friction between the umbrella and the drops of water acts as a centripetal force to the drops of water. However, if the umbrella rotates faster, the friction is not enough to make the water drop circular motion, then the water droplets will move away from the umbrella to the outer edge. It's like using a rope to pull a stone in circular motion. If it's too fast, the rope will break and the rock will fly out. This is the so-called centrifugal centrifugal pump is designed according to this principle. High-speed rotation of the impeller blades to rotate the water, the water thrown, so as to achieve the purpose of delivery. Further reading: industry leaders IFAT China Guangzhou Exhibition building water pump manufacturers ranking article belongs to Internet industry (Xiamen) Co., Ltd. All are welcome to reprint, please indicate the source and author of: Asian pumps Network Editor: gogoing (QQ / WeChat:) Starting: http://beng.liuti.cn/ (Service Hotline:)
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