Apr. 02, 2022
The concept of OEM Impeller: The impeller refers to the wheel disc with moving blades, which is a component of the impulse steam turbine rotor, and can also refer to the general name of the wheel disc and the rotating blades installed on it.
Impellers are usually cast or welded, and the material is selected according to the working medium.
Main function: The impeller converts the mechanical energy of the prime mover into the static pressure energy and dynamic pressure energy of the working fluid.
According to the blade form, there are three types: open impeller, closed impeller, and semi-open impeller.
The closed impeller is composed of front and rear cover plates and blades; the semi-open impeller is composed of blades and rear cover plates; the open impeller only has blades and part of the rear cover plate or no rear cover plate.
The semi-open and open impellers in the slurry pump impeller are easy to cast and can transport media containing certain solid particles. However, because the solid particles abrade the flow channel, the pump efficiency will be reduced.
The closed impeller has high operating efficiency and can run smoothly for a long time. The axial thrust of the pump is small, but the closed impeller is not easy to transport sewage media containing large particles or long fibers.
According to the structure, there are four types: flow channel type (single flow channel, double flow channel), blade type (closed type, open type), spiral centrifugal type, and swirl type.
The runner type impeller is a curved flow path from the inlet to the outlet. This type of impeller is suitable for conveying liquids containing large particles of impurities or long fibers. Because this type of impeller has the excellent anti-clogging performance. But his drawback is that the anti-cavitation performance is weaker than other forms.
The semi-open and open impellers in the blade impeller are convenient for casting and easy to maintain and clean up the impurities that are blocked during transportation.
However, its disadvantage is that the gap between the inner wall of the pressurized water chamber and the blades is enlarged during the abrasion of the solid particles during transportation, which reduces the operating efficiency of the pump, and the increase in the gap makes the stability of the liquid flow in the flow channel damaged. , Make the pump vibrate, this type of impeller is not easy to transport the medium containing large particles and long fibers.
The closed impeller has high operating efficiency and can run smoothly for a long time. The axial thrust of the pump is small, but the closed impeller is easy to be entangled and is not easy to transport sewage media containing large particles or long fibers.
The spiral centrifugal impeller has twisted blades and extends axially from the suction port on the conical hub body.
The conveyed liquid will not hit any part of the pump when flowing through the blades, so there is no damage to the pump, and it is not destructive to the conveyed liquid. Due to the propelling effect of the screw, the suspended particles can pass through, so this type is adopted. The impeller pump is suitable for pumping media containing large particles and long fibers.
The swirling impeller is when all or part of the impeller is retracted to the flow channel of the pressurized water chamber, which has a good anti-blocking performance. The particles flow in the water pressure chamber and are driven by the vortex generated by the rotation of the impeller. The movement of the suspended particles does not generate energy and the flow channel exchanges energy with the liquid.
In the flow process, the suspended particles or long fibers do not contact the worn blades, and the blades are more abraded. There is no gap that is enlarged due to abrasion. It is suitable for pumping media containing large particles and long fibers.