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Sep. 21, 2021
The impeller refers to both the wheel disc with moving blades, which is a component of the impulse turbine rotor, and the general term for the wheel disc and the rotating blades mounted on it. It can be divided into different types according to the working mode and structure. Read on for more information.
There are single suction impeller and double suction impeller. Single suction impeller means that the impeller draws liquid from one side. Double-suction impeller, that is, the impeller from both sides of the liquid inhalation, has excellent anti-cavitation performance.
Open impellers, front semi-open impellers, rear semi-open impellers, closed impellers. Open impellers have only blades with partial back cover or no back cover. Semi-open impeller consists of blades and rear cover plate. Closed impeller consists of front and rear cover plates and blades. The semi-open type and open type impeller in the vane impeller are easy to cast and can convey the medium containing certain solid particles. But due to the solid particles abrasion flow channel, will cause the pump efficiency is reduced. The closed impeller operates with high efficiency, can run smoothly for a long time, and the axial thrust of the pump is small. But the closed impeller is not easy to convey the sewage medium containing large particles or long fibers.
The semi-open type and open type impeller in the vane impeller are easy to cast and easy to maintain to clean the impurities blocked in the conveying process. But his disadvantage is that the transport process of solid particle abrasion under the pressure water chamber wall and the gap between the vane increases, reducing the operating efficiency of the pump, and because the gap increases so that the stability of the flow of liquid in the flow channel is damaged, so that the pump vibration, this type of impeller is not easy to transport media containing large particles and long fibers. The closed impeller has high operating efficiency, can run smoothly for a long time, and the axial thrust of the pump is small, but the closed impeller is easy to be wound, and it is not easy to convey the sewage medium containing large particles or long fibers.
The runner type impeller is a curved runner from the inlet to the outlet, and this type of impeller is suitable for conveying liquids containing large particles of impurities or long fibers. Because this type of impeller has excellent anti-clogging performance. But his disadvantage is that the anti-cavitation performance is weaker than other forms.
Cyclonic impeller is the impeller all or part of the impeller is shrunken to the pressure chamber flow channel, with good anti-clogging performance. Particles in the water pressure chamber flow by the impeller rotation generated by the vortex propulsion movement, suspended particles movement itself does not produce energy, and the flow channel and liquid exchange energy. In the flow process, suspended particles or long fibers do not contact with the wear blade, blade wear more light, there is no gap due to abrasion and increase the situation, suitable for pumping media containing large particles and long fibers.
Spiral centrifugal impeller is a twisted type of vane, in the conical hub body from the suction port along the axial extension. The transported liquid flowing through the vane will not not hit any part of the pump, so there is no damage to the pump type, while there is nothing destructive to the transported liquid due to the propulsive effect of the spiral, the strong passage of suspended particles, so the pump with this type of impeller is suitable for pumping media containing large particles and long fibers.
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