Novel sewage pump cutting device

Abstract

The invention discloses a novel sewage pump cutting device. The novel sewage pump cutting device is mainly composed of a bearing (1), a mechanical seal (2), a connecting key (3), an impeller (4), a pump shaft (5), a front cover plate (6), a ring (7), a cutter head (8), a round nut (9), a pump body (10), an impeller inlet (11) and the like. A submersible sewage pump is provided with the cutter head (8) mounted at the impeller inlet (11) in a pump housing and having dual functions of cutting and stirring. The cutter head (8) is mounted on the pump shaft (5) in front of the impeller inlet and in co-rotation with the impeller to form three-blade radial uniform distribution. The thickness L of every blade of the cuter head (8) is 10 mm-18 mm and the inclination angle alpha is 70 degrees to 85 degrees. The cutter head is treated in a heat treatment process for improving the hardness, abrasion resistance and impact resistance. Impurities, such as long fibers and large particles in sewage are pre-cut by the cutting device before entering the impeller and discharged to a sewage pipe through the sewage pump. The novel sewage pump cutting device has the advantages of solving the problems of particle clogging, long fiber winding and sedimentation of the sewage pump, achieving pre-cutting of impurities, such as the long fibers, ensuring the passing-through performance and the anti-clogging performance of the sewage pump, prolonging the service life of the sewage pump and improving the operation stability of the sewage pump.

Description

technical field [0001] The invention relates to a novel sewage pump cutting device, which belongs to the technical field of fluid machinery, and is especially suitable for a submersible sewage pump to transport sewage and impurities. Background technique [0002] Sewage pumps are mainly used to transport impurities containing fibers and particles such as urban sewage and industrial waste water. However, since the transported medium often contains impurities such as various large particles and long fibers such as long plastic fibers and hemp fibers, the pump is particularly difficult during operation. It is prone to clogging, resulting in poor sewage discharge, which affects the passing performance and operating efficiency of the pump, and reduces its reliability and service life. Many existing sewage pumps containing cutting devices only stir the sewage evenly during work, and the problem of entanglement of impurities such as bunched fibers has not been solved. Therefore, r...

AI Technical Summary

Problems solved by technology

[0002] Sewage pumps are mainly used to transport impurities containing fibers and particles such as urban sewage and industrial waste water. However, since the transported medium often contains impurities such as various large particles and long fibers such as long plastic fibers and hemp fibers, the pump is particularly difficult during operation. It is prone to clogging, resulting in poor sewage discharge, which affects the passing performance and operating efficiency of the pump, and reduces its reliability and service life

Many existing sewage pumps with cutting devices only stir the sewage evenly during work, and the problem of entanglement of impurities such as bunched fibers has not been solved.

However, the structure of the cutting device is very complicated, the cost increases, and the process requirements are high, and it only has a simple cutting function. If there are a lot of long fibers and other deposits at the bottom of the mixing tank, it will cause blockage of the impeller inlet and cause the pump to be shut down for maintenance. It not only shortens the service life of the pump but also delays industrial production

The published patent "Cutting Ring Element of Centrifugal Chopping Pump" (Application No.: 200680015627.8) includes a ring-shaped member with at least one cutting piece arranged along the ring-shaped member and extending outward from it. The cutting ring element is configured to be positioned adjacent to the drive side of an impeller having a cutting member associated with the drive side of the impeller, while the cutting member interacts with the cutting ring to shred and reduce the size of entrained solids in the pumped fluid or slurry, avoiding These solids penetrate behind the impeller, but the structure is very complicated, which not only increases the manufacturing cost but also complicates the manufacturing process

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