Ecologically-friendly type axial flow pump structure for fishes to pass through

Abstract

The invention provides an ecologically-friendly type axial flow pump structure for fishes to pass through. The ecologically-friendly type axial flow pump structure comprises axial flow pump blades, an impeller hub, a runner chamber, a guide vane hub and guide vane blades. One end of each guide vane blade is connected with the guide vane hub, and the other end of each guide vane blade is connected with a guide vane section pipeline. Blade inlet edges of the axial flow pump sweep forward in the rotating direction and downwards extend in the axial direction to form streamlines, and the wing-section heads of the sections of the axial flow pump blades are semicircular arcs. The radial radius of the impeller hub is gradually increased and then is gradually reduced in the liquid flow direction, and the radial radius of the blade inlet edges is maximal. A circular ring is welded to the inlet of the runner chamber. The number of the guide vane blades is not larger than five, and the guide vane inlet edges are the streamlines. A large space is formed by the guide vane inlet edges and blade outlet edges. According to the axial flow pump structure, the probability that the blades collide with the fishes can be greatly reduced, meanwhile, the death rate of the fishes after the fishes are impacted by the blades is reduced, and therefore the survival rate of the fishes is greatly increased, and various fishes can pass through the axial flow pump suitable for large-and-medium pump stations.

Description

technical field [0001] The invention relates to the technical field of hydraulic machinery, in particular to an eco-friendly axial-flow pump structure that can pass fish, and is suitable for axial-flow pumps used in large and medium-sized pumping stations where various fish pass. Background technique [0002] Large and medium-sized pumping stations are the key power equipment for human water resources allocation. As an important engineering measure, it plays an irreplaceable role in the spatio-temporal regulation and governance of water resources; Water for industry and agriculture and domestic water supply for urban and rural residents play an important role. In some domestic coastal cities along rivers, some low-lying countries in Europe, such as the Netherlands, are prone to flood disasters due to rainfall, river and ocean ebb and flow, and pumping stations are an effective means of avoiding such natural disasters. It is developing rapidly at home and abroad, and it is w...

AI Technical Summary

Problems solved by technology

But when the medium of the pump station is live fish, this kind of axial flow pump is not suitable for fish to pass through, because the inlet edge of the blade is too sharp, and the gap between the wheel rim and the runner chamber will also cause the fish to be stuck. The wear of the flow channel to the fish is intensified, and the impact on the fish at the inlet edge of the guide vane will also cause a large number of fish deaths

The patented technology with the publication number CN102400947A proposes the forward sweep of the inlet edge of the blade, but in order to prevent debris from being entangled, the patent makes the blade rim thin and the hub thick, which causes the rim to be damaged due to the greater peripheral speed. The cutting force of the fish is also greater, so the mortality rate of the fish will be greatly increased

From the above points, it can be seen that most axial flow pumps hardly consider the damage to fish when the medium is live fish when optimizing the passing capacity. my country has not yet proposed a new type of axial flow pump to protect fish from passing through large and medium-sized pumping stations. structure

Therefore, the existing technology does not solve the important ecological problem of improving fish survival rate

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