Four forms of D type centrifugal pump impeller

The impeller is the core component of D type centrifugal pump, is the major effect of the work efficiency. Type D is the role of a centrifugal pump impeller prime mover's mechanical energy directly to the liquid, in order to increase the static pressure of the liquid and the kinetic energy ( The main can increase the static pressure) , usually in the impeller blade, front cover, HouGaiBan and hub of four parts.

D type centrifugal pump impeller basically has the following four kinds of forms, closed, first half open and half open, open after the four.

1, closed impeller is also in turn is relatively closed, the front cover, HouGaiBan and blade to form a closed port. It is suitable for the occasion of high transmission form, clean liquid. Closed impeller and single suction and double suction impeller impeller two structures. Closed impeller: consists of leaf with the former, HouGaiBan. Closed impeller efficiency high, manufacture is difficult. Most used in the centrifugal pump. Suitable for conveying water, solution viscosity, such as smaller clean fluid does not contain particles.

2, half open impeller is refers to the impeller passage is semi-closed, compared with the closed impeller front cover, suitable for conveying liquid containing solid particles or impurities. Half open impeller: generally speaking, there are two kinds of structure one for the first half of the open type, composed of HouGaiBan and leaf, the structure of the impeller efficiency is low, to improve the efficiency to be with adjustable clearance of the sealing ring after another for half open, is composed of front cover and the blade, because can be used the same as the closed water pump impeller sealing ring? Efficiency and basic same, closed impeller and blade besides conveying liquid, but also has: back blade or vice impeller sealing function. Half open impeller is suitable for conveying liquid containing solid particles, such as fiber suspension. Half open impeller manufacture difficulty smaller, lower cost, and strong adaptability, applied in the oil refining chemical centrifugal pump in recent years gradually increased, and is used to transport water and approximate water liquid.

3, open impeller: only leaf and leaf stiffener, excellent HouGaiBan impeller. Small number 2 - open impeller blades 5 pieces. Low efficiency of the pump impeller, the application is less, it is mainly used for transmission of high viscosity of the liquid and slurry liquid.

after the centrifugal water pump impeller blade is commonly curved blade. Blade has cylindrical and distorted form two kinds, application of twisted blade can reduce the load on the blade, and improves centrifugal pump inhalation can improve the ability of resistance to cavitation, but manufacturing is difficult, the cost is higher. Water pump impeller refining chemical centrifugal pump impeller to casting or full welding seam overall pump impeller. impeller welding is developed in recent years, more than used for casting the worse performance of metal materials, such as iron and its alloy, manufacturing of chemical use special centrifugal pump. Welding pump impeller geometric accuracy and surface roughness were superior to the casting impeller, is helpful to improve the efficiency of the centrifugal pump.

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