As One Of The Core Of The Slurry Pump, There Are More Than One Type Of Impeller

　　As the core of the slurry pump, the impeller is an important part of pump products. The impeller refers to a roulette with moving blades, as well as a general term for the roulette and the rotating blades installed on it.As a consumable, there are more than one type of impeller, including semi-open impeller, closed impeller and open impeller, each with its own advantages.First, let’s take a look at the closed impeller. It consists of blades and front and rear covers.The closed impeller is efficient and difficult to manufacture, so most slurry pump manufacturers prefer to use it.Suitable for transporting clean liquids without low viscosity particles, such as water and solutions.　　There are generally two types of semi-open impeller structures: one is the front half-open type, composed of a rear cover plate and a blade.The impeller efficiency of this structure is low and requires the use of an adjustable gap sealing ring to improve efficiency; the other is the rear half-open type, consisting of the front cover plate and the blade.Since it can apply the same sealing ring as the closed impeller, its efficiency is basically the same as the closed impeller, and the blades also have sealing functions (rear blade or auxiliary impeller) in addition to conveying liquid.The semi-open impeller is suitable for transporting liquids containing suspended solids such as solid particles and fibers.The manufacturing of semi-open impeller is difficult, low in cost and strong adaptability.It is gradually used in the slurry pumps of the refining and chemical industry to transport clean water and liquids similar to clean water. There are also open impellers: only blades and blade reinforcement ribs, and impellers without front and rear covers (the number of open impellers is less than 2-5 blades).The impeller is inefficient and has few applications, and is mainly used to transport high viscosity liquids and slurry liquids.The blades of the slurry pump impeller are generally backbend blades.There are two types of blades: cylindrical and twisted.The application of twisted blades can reduce the load on the blades, improve the suction performance of the slurry pump, and improve the resistance to cavitation, but it is difficult to manufacture and has high cost.The slurry pumps for oil refining and chemical industries require the impeller to be cast or welded.With the development of welding impellers, they are mostly used for chemical slurry pumps made of metal materials with poor casting performance (such as iron and its alloys).The geometric accuracy and surface finish of the welding impeller are better than those of the cast impeller, which is conducive to improving the efficiency of the slurry pump.