Single phase sewage cutting pump

Abstract

The invention discloses a single-phase sewage cutting pump. The single-phase sewage cutting pump comprises a motor and a pump body, wherein a water inlet is formed in the bottom of the pump body; a cutting device is arranged at the bottom of the pump body and comprises a shell and a fixed plate; the shell and a rotating shaft of the motor are concentric; the fixed plate is fixed at the bottom of the pump body and is concentric with the shell; cushion blocks are arranged between the fixed plate and the bottom of the pump body; by the cushion blocks, empty space is formed between the fixed plate and the bottom of the pump body; a gap is reserved between the periphery of the fixed plate and the inner wall of the shell; a moving plate is placed in a through hole in the center of the fixed plate; the rotating shaft of the motor is connected with the moving plate and drives the moving plate to rotate; a plurality of cutters are mounted on the outer surface of the moving plate in a hinged manner; the axis of a hinged shaft of each cutter and the axis of the rotating shaft of the motor are non-collinear; and blades of the cutters always face the outer side under the effect of a centrifugal force generated during rotation of the moving plate. The low-power motor is used as a power source of the single-phase sewage cutting pump, so that the production cost is reduced; and by special structural designs of the fixed plate, the moving plate, the cutters and a sewage flowing path, the sewage cutting pump may never be jammed.

Description

technical field [0001] The invention is a single-phase sewage cutting pump. Background technique [0002] Sewage cutting pump, also called submersible cutting pump, is used for sewage pumping. Due to the advanced cutting edge, the cutting pump can chop scum, plastic products and fibrous objects in the sump under harsh conditions. And discharge smoothly, no need to manually clean up the scum and suspended matter in the pit, saving municipal and engineering expenses. [0003] Chinese Patent Publication No. CN 105570141 A discloses a sewage cutting pump, such as figure 1 As shown, it includes a pump casing, a pump shaft and an impeller. The blade side of the impeller is provided with a moving blade, and the blade surface of the moving blade is tangent to the inner wall of the pump casing. There is a water inlet on the top, by opening the water inlet, the volume of the suction section is increased, the suction effect is increased, and the speed of the cut material from the dis...

AI Technical Summary

Problems solved by technology

[0004] The sewage cutting pump with the above structure has the following defects in the actual application process: 1) After the garbage enters the pump casing through the water inlet, it passes through the moving blade on the impeller, the fixed blade on the water inlet, and the two sides of the moving blade and the fixed blade. At the same time, the blade surface of the moving blade of the impeller is tangent to the inner wall of the pump casing, which causes some garbage to be stuck between the moving blade and the inner wall of the pump casing during the cutting process. When the impeller is running, due to the torque of the motor and the inertia of the rotation of the motor shaft, the stuck garbage will be further shredded. However, when the cutting pump stops, if the garbage is still stuck between the moving blade and the inner wall of the pump casing, this As a result, the impeller has a "deadlock" phenomenon, and the gap between the impeller and the pump casing is stuck by garbage. When the cutting pump is started next time, the torque of the single-phase motor cannot meet the rotation of the impeller. It is very large, and it is easy to burn out the motor. In this case, a motor with higher power and higher torque is required to start the impeller. However, a high-power motor consumes a lot of energy and costs high, which does not meet the national strategy of energy conservation and emission reduction. Market demand; 2) After the garbage enters the pump casing through the water inlet, most of the garbage is caught by the impeller and rotates synchronously with the impeller, which causes the garbage to not be cut faster and better by the impeller; 3) The dynamics on the impeller The cutting between the blade and the garbage is "hard" cutting, that is, the impeller impacts the garbage by its own rotational inertia and the driving force of the motor shaft, and then cuts the garbage, which reduces the service life of the impeller; 4) The bladed impeller increases The processing procedure, processing difficulty and processing cost

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