Pump is a kind of machinery for liquid transportation, chemical centrifugal pump is one of them. It makes the liquid flowing through the impeller subject to centrifugal force through the impeller, improves the mechanical energy of the liquid, so as to carry out liquid transportation. It is a machine for increasing the energy of the liquid. Pump in chemical production, not only to transport liquid materials and provide the necessary pressure required by the process, but also to ensure the amount of material transported. In a certain chemical unit operation, the flow and head of the pump are required to be stable, to maintain high efficiency and reliable operation of the pump.
Chemical pump transport medium, including raw materials, reaction intermediates, etc. are often corrosive media. Because the flow conveyed by chemical pump contains suspended solid particles, at the same time, the impeller and chamber of the pump also work under high pressure and high flow rate, the surface protective layer of the pump parts is destroyed and its life is short, so it is necessary to improve the wear resistance and erosion resistance of the chemical pump. This requires that the material of the pump should be wear-resistant manganese steel, ceramics, cast iron, erosion-resistant titanium, manganese steel, etc. 。
Chemical pumps sometimes transport critical liquid, once the liquid vaporizes in the pump, it is easy to cause cavitation damage, which requires that the pump has a high anti-cavitation performance. At the same time, the vaporization of liquid may cause friction cementing of the dynamic and static parts of the pump, which requires a larger clearance. In order to avoid the mechanical seal, packing seal and labyrinth seal damaged by dry friction due to the vaporization of liquid, this kind of chemical pump must have the structure of fully eliminating the gas occurring in the pump.