2017-7-9 Purification Technology Version: Q&A
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This post was last edited by hai8487 on 2017-7-11 16:51. What are the different types of impellers for centrifugal pumps? The impellers of centrifugal pumps are divided into covered, semi-covered, and open types. Open and semi-shielded impellers are suitable for transporting materials containing solid particles and those prone to scaling, but their efficiency is lower. Shielded impellers are used for transporting relatively clean materials, and they offer high efficiency. In 2017, in the field of coal chemical industry: “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html. In the petrochemical sector: The “Creative Ideas for Energy Savings” campaign (the second phase is currently in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html
Closed, front half open, back half open, open
Backward-curving blades, radial blades, and forward-curving blades, backward-curving blades
(a) Closed form； (b) Semi-open ； (c) Open type 1. Closed impeller: Composed of blades and front and rear cover plates. Closed impellers have higher efficiency but are more difficult to manufacture, and they are most commonly used in centrifugal pumps. Suitable for transporting clean liquids with low viscosity, such as plain water and solutions, that are free of particles. 2. Semi-open impeller: It can also be further divided into front semi-open and rear semi-open types. Semi-open impellers are relatively easy to manufacture, have lower costs, and exhibit good adaptability; as a result, their use in centrifugal pumps for the oil refining and chemical industries has been increasing in recent years. Semi-open impellers are suitable for transporting liquids containing suspended solids, fibers, and other particles. 3. Open impeller: An impeller that consists only of blades and blade reinforcements, without any front or rear covers (open impellers have a small number of blades, 2–5). Pump impellers with low efficiency are used less frequently; they are mainly employed for transporting liquids with high viscosity as well as slurry-like liquids.
There are mainly 4 types of impellers for centrifugal pump water pumps: (a) closed type； (b) Open at the front half ； (c) Back half open ； (d) Open-type a, closed-type impellers: composed of blades and front and rear cover plates. Closed impellers have higher efficiency but are more difficult to manufacture, and they are most commonly used in centrifugal pumps. Suitable for transporting clean liquids with low viscosity, such as plain water and solutions, that are free of particles. b. Semi-open impellers: There are generally two types of structures. One is the front semi-open type, which consists of a rear cover plate and blades; impellers of this type have lower efficiency. To improve efficiency, a sealing ring with adjustable clearance is required. The other type is the rear semi-open type, which consists of a front cover plate and blades. Since the same sealing rings as those used in closed-type water pump impellers can be employed, its efficiency is roughly the same as that of closed-type impellers. In addition to transporting liquid, the blades also serve a sealing function (as back blades or auxiliary impellers). Semi-open impellers are suitable for transporting liquids containing suspended solids, fibers, and other particles. Semi-open impellers are relatively easy to manufacture, have low costs, and exhibit good adaptability. In recent years, their use in centrifugal pumps for the oil refining and chemical industries has been increasing, and they are also used for transporting clean water and liquids similar to clean water. d. Open impeller: An impeller that consists only of blades and blade reinforcement ribs, without any front or rear cover plates (open impellers have 2–5 blades). Pump impellers with low efficiency are used less frequently; they are mainly employed for transporting liquids with high viscosity as well as slurry-like liquids
Three types: open, semi-open, and closed
For open impellers, semi-open impellers (semi-closed impellers), and closed impellers, the efficiency is arranged from low to high.
Closed impeller. Three types: semi-open impellers, open impellers, etc
Closed, semi-open, fully open. Double-suction type
Closed impeller, semi-closed impeller, open impeller