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What are the types of sewage pump impeller?

Return ListDate:2017-09-29Read:286

1. swirl impeller:

The impeller pump is partly or completely pulled away from the runner of the pressure chamber. Therefore, no plugging performance is good, and the passing capacity of particles and long fiber is stronger. The particles move in the pressurized water chamber, driven by the vortex produced by the impeller rotating. The suspended particles themselves do not generate energy, but exchange energy with the liquid in the flow passage. In the flow process, the suspended particles or long fibers do not contact with the leaves, leaves the situation much less wear and tear, there is no space because of increased erosion and, in the long run will not cause a serious decline in efficiency, the type of impeller pump used for pumping large particles with the medium and long fibers. In terms of performance, the impeller efficiency is low, only about 70% of the ordinary closed impeller, and the head curve is relatively flat.


2. channel impeller:

The impeller belongs to the impeller without blade, and the impeller channel is a curved flow passage from inlet to outlet. Therefore suitable for pumping large particles and long fibers containing medium. Good plugging resistance. In terms of performance, the efficiency of this type of impeller is very small compared with that of the conventional closed impeller, but the head curve of the impeller pump is steeper. The power curve is relatively smooth, and it is not easy to generate super power, but the cavitation performance of the impeller is inferior to that of the common closed impeller, especially suitable for the pump with pressure inlet.


3. screw centrifugal impeller:

The blade of the impeller is a twisted spiral blade, extending along the axial direction from the suction port on the conical hub body. The impeller pump also has the function of volume pump and centrifugal pump. When the suspension particle flows through the blade, it does not impact any part of the pump, so it is nondestructive. Little damage to conveying materials. Due to the promotion of the role of helix, suspended particles through strong, so use the type of impeller suitable for pumping large particles and long fibers containing medium, medium and high concentration. It has obvious characteristics in the case of strict destruction of transport medium.


4. closed impeller:

This type of impeller has higher normal efficiency. And in the long run, the situation is relatively stable, the use of this type of impeller pump axial force is small, and can be placed on the front and rear cover blade. The auxiliary vanes on the front cover can reduce the swirl loss of the impeller inlet and the wear of the particles to the sealing ring. On the back side vane not only play the role of axial force balance, but also can prevent the suspended particles into the cavity of the mechanical seal mechanical seal protection. But the poor non blocking, easy to wound the type of impeller, not in pumping with large particles (long fiber) end after the sewage medium.


5. impeller structure type:

The impeller structure is divided into four categories: blade type (open and closed), cyclone type, channel type, (including single channel and dual channel) spiral centrifugal four open, semi open impeller has the advantages of easy fabrication, when the impeller can cause blockage, cleaning and maintenance easy, but in the long run in, particles will make the blade gap abrasion and water pressure on the indoor side wall increase, thereby reducing efficiency. And the increase of clearance will destroy the pressure difference distribution on the blade. Vortex is not only a large amount of losses and the pump will increase the axial force, at the same time, increase the gap, flow in the stability of liquid flow damage to the pump vibration, the impeller type is not easy to transport with large particles and long fibers of the media, from the performance perspective, the type of impeller efficiency is low. The highest efficiency is equivalent to an ordinary closed around 92%, a relatively flat head curve.