Introduction to the impeller structure type of WQ submersible sewage pump

WQ submersible sewage pumps belong to a type of non-clogging pumps and come in various forms: submersible and dry. Currently, the most commonly used submersible type is the submersible sewage pump, while the most common dry sewage pumps include horizontal and vertical sewage pumps. They are mainly used to transport urban sewage, feces, or media containing fibers, paper scraps, and other solid particles. The temperature of the medium being transported is usually not higher than 80°C. Due to the presence of easily entangled or bundled fibers in the medium being transported, the flow passage of these pumps is prone to clogging. Once the pump is clogged, it cannot operate normally and may even burn out the motor, resulting in poor sewage discharge. This has serious impacts on urban life and environmental protection. Therefore, anti-clogging and reliability are important factors in evaluating the quality of sewage pumps.

Like other pumps, the impeller and the pressure chamber are the two core components of a sewage pump. Their performance determines the overall performance of the pump. The anti-clogging ability, efficiency, cavitation resistance, and wear resistance of a sewage pump are primarily ensured by these two major components.

Structural type of WQ submersible sewage pump impeller:

The structure of the impeller is divided into four major categories: vane type (open type, closed type), swirl type, flow channel type (including single flow channel and double flow channel), and helical centrifugal type. Open and semi-open impellers are easy to manufacture. When there is blockage inside the impeller, it can be easily cleaned and repaired. However, over long-term operation, the abrasion from particles will increase the gap between the blades and the inner wall of the pressure chamber, thereby reducing efficiency. Moreover, the increased gap will disrupt the pressure difference distribution on the blades. This not only generates a large amount of vortex loss but also increases the axial force on the pump. At the same time, due to the increased gap, the stability of the flow pattern in the flow channel is disrupted, causing vibration in the pump. This type of impeller is not suitable for conveying media containing large particles and long fibers. In terms of performance, this type of impeller has low efficiency, with a maximum efficiency of about 92% of that of a common closed-type impeller, and a relatively flat head curve.