Sewage water pump

Sewage  water pump

Sewage pump is a kind of non-clog pump, with a variety of forms, such as wet and dry type two kinds, the most often for WQ submersible type submersible sewage pump, the most common dry sewage pump, such as w-type horizontal sewage pump and WL vertical sewage pump type two kinds.It is mainly used for transporting municipal sewage, feces or liquid containing fiber.Paper scraps, such as solid particle medium, usually the temperature of the medium to be delivered no greater than 80 ℃.Because of the medium that is transported, there are fibers that are easily wound or bunched.Therefore, this kind of pump runner is easy to be blocked. Once the pump is blocked, the pump can't work properly and even burn the motor, resulting in poor drainage.It has a serious impact on urban life and environmental protection.Therefore, anti - plugging and reliability are important factors of sewage pump.

Like other pumps, the impeller, the pressurized water chamber, is the two core components of the sewage pump.The pros and cons of its performance, also on behalf of the advantages and disadvantages of pump performance, the anti-clogging sewage pump performance, efficiency, and cavitation performance, anti-abrasion performance mainly by vane pump and the pressurized water chamber to ensure that the two parts.Here is an introduction:

1, impeller structure: the structure of the impeller is divided into four categories: vane (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.And the increase of clearance can damage the pressure 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. Swirl impeller: the pump of this type impeller is used, because the impeller part or all of the shrinkage pressure water chamber flow.Therefore, no clogging performance is good, the ability of passing grain and long fiber is stronger.The particles in the pressurized water flow are driven by vortices generated by the rotation of the impeller. The suspended particles themselves do not produce energy, but only exchange energy in the flow channel and liquid.In the process of flow, suspended particles or long fibers do not contact with the blades, the blade wear more lighter, there is no gap for abrasion and increase in the long run will not cause the problem of serious decline in efficiency of using this type of impeller pump suitable for pumping medium and long fibers containing large particles.In terms of performance, the impeller is less efficient, which is only about 70% of the normal closed impeller, and the lift curve is relatively flat.

3. Closed impeller: the impeller of this type is more efficient.In the long run, the condition is relatively stable, the pump axial force of this type impeller is small, and the auxiliary blade can be set on the front and rear cover plate.The blades on the front cover can reduce the vortex loss of impeller inlet and the wear of the particles to the sealing ring.The auxiliary blade on the back cover not only plays the role of balancing axial force, but also prevents the floating particles from entering the mechanical seal chamber to protect the mechanical seal.However, this type impeller is not blocked, easy to be wound, not suitable for pumping large particles (long fibers), etc.

4. Runner impeller: this kind of impeller belongs to the impeller impeller, and the impeller runner is a curved channel from the inlet to the outlet.Therefore, it is suitable to extract medium containing large particles and long fibers.Good resistance to plugging.In terms of performance, this type of impeller efficiency is not very different from that of ordinary closed impeller, but it is more steep to use this type of impeller pump.The power curve is relatively stable, and it is not easy to produce the problem of super power, but the cavitation performance of this type impeller is not as good as that of ordinary closed impeller, especially suitable for the pump with pressure inlet.

5. Spiral centrifugal impeller: the blade of this type impeller is a twisted spiral blade, which extends from the suction inlet along the axis to the cone hub body.The pump of this type impeller has the function of volute pump and centrifugal pump. The suspended particles flow out of the blade and do not impinge on any part of the pump, so it is not damaged.Little damage to the conveyor.Due to the propulsion of the spiral, the passing of the suspended particles is strong, so the pump using this type of impeller is suitable for pumping medium with large particles and long fibers, as well as a high concentration of media.It has obvious characteristics in the case of strict requirement for the destruction of conveying medium.

In terms of performance, the pump has a steep lift curve and a smooth power curve.

The most common type of pressurized water chamber used in the sewage pump is the volute shell, and the radial guide or runner blade is used in the inner mounted submersible pump.The volute has three kinds of spiral, ring and mediating type.Spiral volute is basically not in the sewage pump.The circular pressurized water chamber is easy to be used in small sewage pumps due to its simple structure.However, the application scope of the annular pressure chamber in the intermediate (semi-spiral) pressurized water chamber gradually becomes smaller.Because of the intermediate pressure water chamber and the helical high efficiency and the high permeability of the annular pressure chamber.More and more manufacturers are paying attention.

To sum up, no matter any series of sewage pump is a different type of impeller and different type of pressurized water chamber according to the transmission medium and installation requirements such as a combination, as long as the impeller and the pressurized water chamber can optimize configuration.The performance of the pump is guaranteed.