Submersible cutting sewage pump with efficient hydraulic performance

Abstract

The invention relates to a submersible cutting sewage pump with efficient hydraulic performance and belongs to the technical field of submersible pumps. The submersible cutting sewage pump comprising a submersible motor is characterized in that the submersible motor is connected with a pump body below through a connection segment to form a cooling and lubricating oil chamber; an efficient large-pass semi-open impeller having a rear cover plate is disposed in the center of the lower portion of the pump body; an inlet edge of each impeller blade is provided with a 30-45-degree large guiding tilt angle from the rear cover plate and a front cover plate, and a center line of an impeller blade outlet pass is flush with a center line of a radial outlet of the pump body; the lower end face of the pump body is connected with a pump base, a cutting disc which is axially adjustable is connected to the upper portion of the pump base, the cross section of the upper end of the cutting disc is completely the same as a flow surface of the front cover plate, projecting to the impeller blade axial surface, in shape, and a 0.2-0.3 mm required gap can be formed between the upper end of the cutting disc and the flow surface of the front cover plate, projecting to the impeller blade, by adjusting axial movement of the cutting disc. The submersible cutting sewage pump is high in hydraulic efficiency, has a wide efficient area, allows suctioning and passage of large particles, and has good effect of impurity cutting and tearing.

Description

technical field [0001] The invention belongs to the technical field of submersible pumps, in particular to a submersible cutting sewage pump with high-efficiency hydraulic characteristics, and in particular to the structure of the submersible sewage pump. Background technique [0002] The cutting-type submersible cutting sewage pump in the prior art adopts the structure mode of installing the fixed knife and the rotating knife at the water inlet of the sewage pump impeller, and several flow holes are arranged on the fixed knife to be tangent to several blades of the rotating knife, so To cut, 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 circle of the fixed knife; the rotary knife is fixed on the pump shaft ; There are two or more cutter heads on the outer circle of the rotary knife; the cutter head of the fixed kni...

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

Images