Sewage pump with cutting device

Abstract

The invention discloses a sewage pump with a cutting device. The pump mainly comprises a pump body, a pump shaft, a motor, an impeller, a mechanical seal and a suction cover and is characterized in that the cutting device is disposed on the bottom of the suction cover; the cutting device comprises a cutter base, a cutter, a fastening nut and a positioning key; both the cutter base and the cutter are plane-shaped cuboids; the cutter base movably sleeves the lower end of the pump shaft via an installation through hole; two ends are firmly connected to the suction cover respectively; and the center of the cutter passes through a fixation hole and a positioning key groove via the fastening nut and the positioning key to be firmly connected with the lower end of the pump shaft, so that a movable cutting blade of the cutter is contacted with a fixed cutter blade of the cutter base in an oppositely staggered manner to form a cutting edge like a pair of scissors. By the structure, the sewage pump disclosed by the invention has the advantages of a simple structure, good cutting performance, smooth sewage discharging, high working efficiency, stable running, high safety and reliability, and a long service life, etc.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering pumps, in particular to a sewage pump with a cutting device. Background technique [0002] The cutting-type submersible cutting sewage pump in the prior art adopts the installation structure of the fixed cutter head and the rotary knife at the water inlet of the sewage pump impeller, and several flow holes are arranged on the fixed cutter head to be tangent to the blades of the rotary knife. , to play a cutting role, or a fixed knife is installed at the inlet of the pump body, and the inner circumference of the fixed knife is provided with three or more cutter heads; a rotary knife is installed in the center of the inner ring of the fixed knife; the rotary knife is fixed on the pump On the shaft; two or more cutter heads are arranged on the outer circle of the rotary knife; the cutter head of the fixed knife is tangent to the inner and outer sides of the cutter head of the rotary kn...

AI Technical Summary

Problems solved by technology

In this way, the installation of fixed knives and rotating knives at the water inlet of the impeller will inevitably produce certain resistance to the suction performance of the pumped medium, especially when the pumped medium is running in a large flow area, the pumping medium will be out of flow, and the pumping head will drop extremely, which will make the pump Inflection point of flow-head characteristic curve

At the same time, during the operation, there will be fibers wound on the pump shaft and the rotary cutter head through the rotating shaft of the rotary cutter at the water inlet of the impeller and the attached fixing device, which will further block the suction of the pumping medium, and in severe cases, the sewage pump will be generated. The anti-rotation phenomenon may even cause the motor to overheat and burn out the motor stator winding

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