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Structure and performance characteristics of sewage pump
Category: Company News
Date: 2019-01-02
Click: 530
Author: 佚名
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The suspended particles flow out of the blade and do not impact any part of the pump, so it has good nondestructive property. Less destructive to the carrier.

1. Impeller structure type

Impeller structure is divided into four categories: type (open and closed), the vortex flow, the flow type, (including single port and shuangliu) spiral centrifugal, four open half open impeller manufacture is convenient, when caused by blocked in the impeller, can easy cleaning and maintenance, but in the long run, under the abrasion of the particles can make the blade and the interior wall of pressure water gap increased, thus reduce the efficiency. Moreover, the increase of clearance will destroy the pressure difference distribution on the blade. Produce large amounts of vortex loss not only, and axial force of pump will increase, at the same time, due to the gap increased, the stability of the liquid flow pattern of flow is damaged, make the pump produces vibration, this type of impeller is not easy to transport with large particles medium and long fibers, from the performance, the type of impeller efficiency is low, the highest efficiency about ordinary closed about 92% of the impeller, relatively flat head curve.

2. Swirling impeller

The impeller pump adopts this type of impeller because the impeller is partially or completely withdrawn from the pressurized water chamber flow passage. So no clogging performance is good, through the ability of particles and long fiber through the ability is strong. Particles flow in the pressurized water chamber driven by the eddy current generated by the rotation of the impeller. The suspended particles themselves do not generate energy, but only exchange energy with the liquid in the flow passage. In the flow process, suspended particles or long fibers do not contact with the blade, the blade wear is relatively light, there is no gap due to abrasion and increase the situation, in the long-term operation will not cause a serious decline in efficiency, the pump using this type of impeller is suitable for pumping medium containing large particles and long fibers. In terms of performance, the impeller is of low efficiency, only equivalent to about 70% of ordinary closed impeller, and the head curve is relatively flat.

3. Closed impeller

This type of impeller has higher normal efficiency. The pump axial force of this type of impeller is small, and auxiliary blades can be set on the front and rear cover plates. The auxiliary blade on the front cover plate can reduce the vortex loss at the impeller inlet and the wear of the sealing ring by particles. The secondary blade on the rear cover plate not only ACTS as a counterbalance to the axial force, but also can prevent suspended particles from entering the mechanical seal cavity to protect the mechanical seal. However, this type of impeller has poor non-plugging property and is easy to be wound, so it is not suitable for pumping medium containing large particles (long fibers) and other untreated sewage.

4. Runner impeller

This kind of impeller belongs to impeller without blade, impeller runner is a curved runner from the inlet to the outlet. So suitable for pumping medium containing large particles and long fibers. Good blocking resistance. In terms of performance, the high efficiency of this type of impeller is not much different from that of ordinary closed impeller, but the head curve of this type of impeller pump is relatively steep. The power curve is relatively stable, and it is not easy to produce the problem of overpower, but the cavitation performance of this type of impeller is not as good as that of ordinary closed impeller, especially suitable for pump with pressure inlet.

5. Spiral centrifugal impeller

The blades of this type of impeller are twisted spiral blades extending along the axis from the suction inlet on the conical hub body. The pump of this type of impeller has the function of both volume pump and centrifugal pump. The suspended particles flow out of the blade and do not impact any part of the pump, so it has good nondestructive property. Less destructive to the carrier. The impeller pump is suitable for pumping medium containing large particles and long fibers, as well as medium with high concentration, due to the strong passage of suspended particles due to the propulsion of the screw. It has obvious characteristics under the condition of strict requirement for the destruction of conveying medium.


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