sewage pump structure

Sewage pumps and other pumps, the impeller, the pressurized water chamber, are two core components of 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. Respectively introduce the below:

Impeller structure:

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 with pressurized water indoor wall gap increased, thus reduce the efficiency. And clearance increases damage of differential pressure distribution on 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.

Vortex flow impeller:

By using this type of impeller pump, due to the impeller part or the whole shrink away from the pressurized water chamber port. So there is no blocking performance is good, grain capacity and long fiber through ability is stronger. Particles in the pressurized water chamber of the eddy current generated by the impeller rotating movement, under the impetus of the suspended particles of itself does not produce energy, and only in the flow passage of fluid exchange of energy. 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 performance, low efficiency, the impeller is only equivalent to about 70% of the ordinary closed impeller, relatively flat head curve.

Closed impeller:

This type of impeller normal efficiency is higher. And the situation is stable in the long run, by using this type of impeller pump axial force is small, and can be set on the plate before and after the blade. Deputy leaves on the front cover can reduce the imports of vortex impeller loss and particle wear of sealing ring. HouGaiBan deputy leaves on not only balance the action of axial force, but also can prevent suspended particles from entering the mechanical seal chamber of mechanical seal protection. But there was no wall of the type of impeller poor, easy to wound, not in pumping with large particles (long fiber), etc. At the end of the treated sewage medium.

Flow impeller:

Belong to this kind of impeller vaneless impeller, the impeller passage is a from import to export a bend flow. So it is suitable for pumping with large particles medium and long fibers. The blocking resistance is good.

Tell from the performance, the type of impeller with high efficiency and normal closed impeller were similar, but with the type of impeller pump head curve is relatively steep fall. Power curve is more stable, not easy to produce super power, but the type of impeller cavitation performance than ordinary closed impeller, especially suitable for use in a pressure on the imported pumps.

Screw centrifugal impeller:

This type of impeller blades for distorted spiral blade, from the suction on the conical wheel body along the axial extension. The type of impeller pump and have the function of the displacement pump and centrifugal pump, suspended particles in the blade have been out of date, do not impact in any parts of the pump, so the good condition. Less damaging to delivery. Due to the effect of advance of the screw, suspended particles through strong sex, so this type of impeller pump suitable for pumping with large particles of medium and long fibers, and a high concentration of medium. The damage to the transmission medium have strict requirements of occasions has distinct characteristics.

In terms of performance of the pump has a steep fall in the lift curve, power curve is relatively flat.

Pressurized water chamber structure

Sewage pump USES the pressurized water chamber of the most common is the volute, loading, submersible pump in more choose radial diffuser or port type guide vane. Spiral helical, ring type and intermediary type 3 kinds. Spiral volute basically don't in the sewage pump. Annular water chamber pressure due to the simple in structure, convenient in manufacturing in small sewage pump used on more. But as a result of mediation (half spiral) the emergence of the pressurized water chamber the application range of the annular water chamber pressure became smaller. Because of intermediary type pressurized water chamber and spiral efficient willfulness and annular water chamber pressure and high permeability. Has been more and more get the attention of manufacturers.

conclusion

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. Pump performance will be guaranteed. (of course also cannot ignore other parts of the structure of the design and manufacture.)