Semi-open type self-cutting blocking-free pump impeller for shearing structure

Abstract

The invention relates to a semi-open type self-cutting blocking-free pump impeller for a shearing structure. The semi-open type self-cutting blocking-free pump impeller for the shearing structure is characterized in that the impeller which is in a semi-open type comprises two blades; inlet pumps (1) of blades (4) of the impeller (5) are provided with two cutting tool bits (3); the cutting tool bits (3) are provided with certain angles; the cutting tool bits (3) and the impeller blades (4) form into milling cutter structures. Filaments and large particles are cut off by the milling cutter structures which are formed by the impeller blades (4) and the cutting tool bits (3) when enter the impeller (5) under impact of fluid, blocking of the pump impeller channel is reduced, and the pass ability of dirt impurities is improved. The semi-open type self-cutting free-blocking pump impeller for the shearing structure is simple in structure and stable in operation, effectively reduces the blocking of the pump impeller channel and improves the passing performance and improves the operation efficiency of the dirt impurities.

Description

technical field [0001] The invention relates to a non-clogging pump impeller capable of transporting sewage and dirt media, in particular to a non-clogging pump impeller capable of cutting fibers, and belongs to the technical field of sewage transporting equipment. Background technique [0002] Pumps for water treatment mainly include centrifugal pumps, sewage pumps, screw pumps, deep well pumps, non-clogging pumps, etc. Among them, non-clogging pumps are one of the key equipment in sewage treatment plants, which are mainly used to transport industrial processes, domestic sewage, and industrial wastewater Liquids containing fibrous suspensions or solid particle suspensions, etc. As far as the structure of non-clogging pumps is concerned, there are mainly submersible sewage pumps, vertical sewage pumps, horizontal sewage pumps, etc. Submersible sewage pumps have many advantages and are mainly used in sewage treatment plants with a daily processing capacity of less than 250,00...

AI Technical Summary

Problems solved by technology

The closed impeller has relatively high efficiency and can run stably for a long time, but its anti-winding and clogging performance is poor, so closed impellers are generally not used in sewage treatment equipment

The open or semi-open impeller is easy to manufacture. When the impeller is clogged, it can be cleaned and repaired relatively easily. However, due to the suspended solids contained in the sewage medium, the gap between the impeller and the inner wall of the front end cover increases, resulting in a sewage pump. greatly reduced efficiency

The main feature of the swirl pump impeller is that the impeller retracts in the pump chamber behind the pressurized water chamber, which can greatly improve the passing capacity of the water pump for solid particles and suspended solids. The impeller has a simple structure, easy manufacture, stable performance and reliable operation. The main disadvantage is that the efficiency is low, and due to the circulating flow in the pump chamber, the hydraulic loss is very large, the efficiency is generally about 50%, and its non-destructiveness is poor, and it has great damage to the conveyed materials.

[0004] After retrieval, the published patent "cutting assembly of stainless steel cutting submersible pump" (application number: 201210351024.2) includes a static cutting knife pair with a circular through hole and a dynamic cutting pair passing through the through hole. Between the outer side of the cutting pair and the inner edge of the static cutting pair, there is a medium passage that can provide the medium from one port of the through hole of the static cutting pair to the other port. This structure can cut fabrics, etc., and ensure the hydraulic performance and lift of the pump. However, the structure is very complicated, and the cutter disk device needs to consume part of the power, resulting in a decrease in the efficiency of the pump, and if it is a small-caliber pump, the cutting device itself also blocks the passing capacity of the pump, causing a certain degree of blockage; the published patent "A semi-open self-cutting non-clogging pump impeller" (Patent No.: ZL201320647476.5), which is characterized in that the impeller adopts a semi-open double-blade structure. The impeller blade inlet naturally forms a cutting knife by its own structure, and the knife edge is hard after heat treatment. , with self-cutting function, when solid impurities such as long fibers and large particles flow in from the pump inlet with the fluid, they are cut by the cutting knife at the front edge of the impeller at the impeller to cut the impurities into pieces. Its structure is simple, passable and anti-winding Good performance, but when the sewage contains a large amount of long fibers, its self-cutting function cannot cut the long fibers well, so that the long fiber medium is easy to entangle and block the leading edge of the pump blade, and even cause the entire pump to be blocked , which greatly shortens its service life

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