Submersible pump: swirl impeller and runner impeller difference
Runner impeller:The impeller belongs to an impeller without blade, and the impeller runner is a curved flow passage from inlet to outlet. Therefore suitable for pumping large particles and long fibers containing medium. Good anti blocking property. From the performance point of view, the efficiency of this type of impeller is very small compared with that of the ordinary closed impeller, but the head curve of this type of impeller pump is steeper. The power curve is relatively smooth, and it is difficult to generate super power, but the performance of this type of impeller is better than that of the common closed impeller, especially suitable for the pump with pressure inlet.
Closed impeller:This type of impeller has higher normal efficiency. And in the long-term operation, the situation is relatively stable, the use of this type of impeller pump axial force is smaller, and can be placed on the front and rear cover blade. The side 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.
Swirl impeller:The impeller of this type of impeller is partly or completely pulled away from the runner of the pressurized water chamber. Therefore, no plugging performance, good particle capacity and long fiber pass capacity. Particles in the pressurized water flow through the impeller rotation of the vortex driven movement, suspended particles itself does not produce energy, but in the flow channel and liquid exchange of energy. 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. From the performance point of view, the impeller efficiency is low, only equivalent to about 70% of the ordinary closed impeller, the head curve is relatively flat
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 the 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.
