submersible sewage pumpLike other pumps, the impeller, pump casing, and motor are the core components of the sewage pump. The quality of its performance represents the quality of the pump performance. The anti clogging performance, efficiency, cavitation performance, and anti abrasion performance of the sewage pump are mainly ensured by the two major components of the vane pump and the pressure chamber. Below are some introductions:
　　
1. Impeller structure type: The impeller structure is divided into four categories: blade type (open, closed), swirl type, channel type, (including single channel and double channel) spiral centrifugal type. The open semi open impeller is easy to manufacture and can be easily cleaned and repaired when blockage occurs inside the impeller. However, during operation, the clearance between the blades and the side wall of the pressurized water chamber will increase due to particle abrasion, resulting in reduced efficiency. And increasing the gap will disrupt the pressure distribution on the blades. Not only does it generate a large amount of vortex loss, but it also increases the axial force of the pump. At the same time, due to the increased gap, the stability of the liquid flow in the channel is disrupted, causing the pump to vibrate. This type of impeller is not easy to transport media containing large particles and long fibers. In terms of performance, this type of impeller has low efficiency, with a rate of about 92% of that of ordinary closed impellers, and a relatively flat head curve.
　　
2. Swirl impeller: Pumps using this type of impeller have some or all of the impeller retracted from the pressure chamber flow channel. So it has good non blocking performance, strong particle passing ability and long fiber passing ability. The particles flow in the pressurized water chamber and are propelled by the vortex generated by the rotation of the impeller. Suspended particles themselves do not generate energy, but only exchange energy with the liquid in the flow channel. During the flow process, suspended particles or long fibers do not come into contact with the blades, and the situation of blade wear is relatively mild. There is no situation where the gap increases due to abrasion, and it will not cause serious efficiency decline during operation. Adopting this type of impellersewage pumpSuitable for pumping media containing large particles and long fibers. In terms of performance, the efficiency of this impeller is relatively low, only about 70% of that of a regular closed impeller, and the head curve is relatively flat.
　　
3. Closed impeller: This type of impeller has a higher normal efficiency. And during operation, the situation is relatively stable. Pumps using this type of impeller have less axial force, and auxiliary blades can be installed on the front and rear cover plates. The auxiliary blades on the front cover plate can reduce the vortex loss at the impeller inlet and the wear of particles on the sealing ring. The secondary blades on the rear cover plate not only serve to balance axial forces, but also prevent suspended particles from entering the mechanical seal chamber and provide protection for the mechanical seal. However, this type of impeller has poor non clogging performance, is easy to wrap, and is not suitable for pumping untreated sewage media containing large particles (long fibers).
　　
4. Flow channel impeller: This type of impeller belongs to bladeless impellers, and the impeller flow channel is a curved flow channel from the inlet to the outlet. So it is suitable for pumping media containing large particles and long fibers. Good anti blocking performance. In terms of performance, this type of impeller has high efficiency and is not much different from ordinary closed impellers, but the head curve of the pump with this type of impeller drops sharply. The power curve is relatively stable,WQ submersible sewage pumpIt is not easy to generate high-power problems, but the cavitation performance of this type of impeller is not as good as that of ordinary closed impellers, especially suitable for use in pumps with pressure inlets.
　　
5. Spiral centrifugal impeller: The blades of this type of impeller are twisted spiral blades that extend axially from the suction port on a conical hub body. This type of impeller pump has both the functions of a positive displacement pump and a centrifugal pump. When suspended particles flow through the blades, they do not hit any part of the pump, so it has good non-destructive properties. Less destructive to the conveyed material. Due to the propulsion effect of the spiral, suspended particles have strong passability, so pumps using this type of impeller are suitable for pumping media containing large particles and long fibers, as well as high concentration media. It has obvious characteristics in situations where there are strict requirements for the destruction of the conveying medium.