The slurry pump is a kind of centrifugal pump. Its working principle is to increase the energy of the solid and liquid mixed medium by using the centrifugal force generated by the rotation of the impeller in the centrifugal pump, thereby converting electrical energy into the controlled kinetic energy and potential energy in the pump.
Slurry pump accessories include a sheath, guard plate, impeller, seal, etc. The impeller is an important component of the slurry pump, and it is also a working part. It relies on its high-speed rotation to perform work on the liquid to achieve liquid transportation. According to the working environment of the slurry pump, the requirements for the material and structure of the impeller are also different. From the structure, it can be divided into three types: open, semi-closed, and closed.
The impeller is generally composed of three parts: hub, blades, and cover plate. The cover of the impeller is divided into a front cover and a rear cover. The cover on the inlet side of the impeller is called the front cover, and the cover on the other side is called the rear cover.
Type of Centrifugal Pump Impeller
1. Closed impeller
The structure of the closed impeller includes runner blades and main and auxiliary blades. The structure is complex. There are cover plates on both sides of the impeller. There are 4-6 blades between the cover plates. When the bending direction of the blades is opposite to the rotation direction of the impeller, it is called a shield. Curved blades. The gap between the impeller and the side of the casing can be appropriately enlarged, which is conducive to maintenance and installation. The auxiliary blades can be arranged on the front and rear cover plates to improve work efficiency.
This kind of closed impeller has higher efficiency and wide application. It is suitable for conveying clean liquid without solid particles and fibers. The closed impeller has two types of single suction and double suction. The double suction impeller has a larger infusion volume than the single-suction impeller.
2. Open impeller
The two sides of the open impeller blades are open, and a gas channel is formed by the blade channel and the inner wall of the casing. This kind of impeller is simple in structure, easy to manufacture, but low inefficiency, and is suitable for conveying liquids containing more solid suspended matter or fibers.
3. Semi-closed impeller
This impeller has only a rear cover, which is suitable for conveying liquids that are easy to precipitate or contain solid suspended solids, and its efficiency is between open and closed impellers.
According to different needs, the impeller can be made of cast iron, cast steel, stainless steel, glass fiber reinforced plastic, and other materials. The manufacturing methods of the impeller include sand foundry casting, precision casting, welding, molding, etc., and its size, shape, and manufacturing accuracy have a great impact on the performance of the pump. Big.
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