Sewage pump knowledge
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Like other pumps, impellers and pressurized water chambers are the two core components of a sewage pump. The merits of its performance, also on behalf of the pros and cons of pump performance, sewage pump anti-clogging performance, the level of efficiency, as well as cavitation performance, anti-erosion performance mainly by the leaf pump and pressurized water chamber to ensure that the two major components. Here are an introduction:
1, the structure of the impeller: impeller structure is divided into four categories: leaf type (open, closed), cyclone, runner type (including single and double runner) spiral centrifugal four, open Semi-open impeller manufacturing convenience, when the impeller caused by blockage, it can be very easy to clean and repair, but in the long run, under the erosion of the particles will make the blade and the pressurized water chamber inside the wall gap increases, so that the efficiency reduce. And the increase of clearance will destroy the pressure distribution on the blade. Not only produces a large amount of vortex loss, but also increases the axial force of the pump. At the same time, due to the increased clearance, the stability of the liquid state in the flow passage is destroyed, causing the pump to vibrate. This impeller is not easy to transport Large particles and long fiber media, from the performance point of view, the low efficiency of the impeller type, the highest efficiency of about 92% of ordinary closed impeller, lift curve is relatively flat.
2, swirl impeller: The type of impeller pump, as part or all of the impeller shrinking pressure water chamber runner. So no blockage performance is good, through the ability of particles and the ability of long fibers through. Particles flow in the pressurized water chamber is driven by the vortex generated by the rotation of the impeller. The suspended particles themselves do not generate energy and only exchange energy with the liquid in the flow channel. In the process of flow, suspended particles or long fibers are not in contact with the blade, the blade is more wear and tear less, there is no increase in the gap due to abrasion, long-term operation will not cause a serious decline in efficiency, the use of the Type impeller pumps are suitable for pumping media containing large particles and long fibers. From the performance point of view, the impeller efficiency is low, equivalent to only about 70% of ordinary closed impeller, lift curve is relatively flat.
3, Closed impeller: This type of impeller is more efficient. And in the long run the situation is more stable, the use of the type of impeller pump axial force is small, and can be set in the front and rear cover Vice blades. The auxiliary blades on the front cover reduce vortex loss at the impeller inlet and wear of the seal ring by the particles. The auxiliary blades on the rear cover not only act to balance the axial forces but also prevent the suspended particles from entering the mechanical seal chamber to protect the mechanical seal. However, the impeller of this type has poor non-blocking property and is easy to wind, so it is not suitable for pumping the untreated sewage medium containing large particles (long fibers).
4, runner-type impeller: This type of impeller bladeless impeller, impeller runner is a from inlet to outlet of a curved runner. It is suitable for pumping medium containing large particles and long fibers. Good anti-blocking. From the performance point of view, the type of high efficiency impeller and ordinary closed impeller or less, but the type of impeller pump head curve is steep drop. The power curve is relatively stable, not easy to produce super power problems, but this type of impeller cavitation performance than ordinary closed impeller, especially suitable for pressure on the pump.
5, Spiral Centrifugal Impeller: This type of impeller blades for the twisted helical blades in the tapered hub body axially extending from the suction port. This type of impeller pump also has the role of volumetric pumps and centrifugal pumps, suspended particles flow in the leaves, do not hit any part of the pump, so good non-destructive. Destructive on the transport of small objects. Due to the helical propulsion and the high permeability of the suspended particles, pumps using this type of impeller are suitable for pumping media containing large particles and long fibers, as well as highly concentrated media. In the transport of media destruction has strict requirements of the occasion has obvious characteristics.
From a performance point of view, the pump has a steep drop in head curve, the power curve is relatively flat.
Sewage pump pressure chamber is the most common is the volute, built-in submersible pump and more use of radial guide vane or flow guide vane. Volute spiral, ring and intermediary three. Spiral volute is basically not used in the sewage pump. Ring pressure chamber due to simple structure manufacturing convenience in the small sewage pump used more. However, due to the intermediary type (semi-spiral) pressurized water chamber appears annular pressure water chamber application area becomes smaller. Due to the intermediary type pressurized water chamber and the helical high efficiency and high pressure circular chamber water permeability. Has been more and more manufacturers attention.