Water inlet structure vortex control device based on fermat's spiral

Abstract

The invention relates to a water inlet structure vortex control device based on the fermat's spiral. Manufacturing includes the following steps that firstly, the width L1 of a water inlet structure and the diameter D of the opening of a flare tube serve as constraint conditions, and a fermat's spiral equation is used for design; according to the width L1 of the water inlet structure and the diameter D of the opening of the flare tube, the fermat's spiral is drawn into a planar curve after the specific value of a is determined; secondly, according to the suspension height L2 of the flare tube and the number m of gaps of adjacent spirals in a plane, the vertical distance L3 between the two adjacent spirals is determined; thirdly, the planar curve is processed and manufactured through steel ribs in the same proportion, the surfaces of the steel ribs are coated with anti-rust paint after manufacturing, vertical stretching distribution is conducted according to the vertical distance L3, andthe three-dimensional vortex control device is obtained. The vortex control device is fixed to a bottom plate of the water inlet structure, and the center of the vortex control device and the centerof the opening of the flare tube are located in the same vertical line. By means of the device, energy concentration of bottom-attached vortexes can be effectively damaged, and the source of generation of the bottom-attached vortexes can be eliminated.

Description

technical field [0001] The invention relates to a Fermat spiral-based vortex control device for a water inlet structure, which belongs to the technical field of pumping station engineering. Background technique [0002] Small and medium-sized irrigation and drainage pumping stations often use a wet room pump room. The water inlet structure of this pump room mostly adopts a box culvert type water inlet structure or an open water inlet pool. of structures. For axial flow pumps and guide vane mixed flow pumps, the bell pipe and suction pipe are the transition sections between the water inlet structure and the inlet of the impeller chamber, and the internal flow state of the bell pipe and water suction pipe must be affected by the internal flow state of the water inlet structure. The main function of the water inlet structure is to provide good water inlet conditions for the pump inlet. If the flow velocity distribution inside the water inlet structure is uneven, or even vorte...

AI Technical Summary

Problems solved by technology

If the flow velocity distribution inside the water inlet structure is uneven, or even vortex belts are generated, the energy performance and cavitation performance of the pump will inevitably be significantly reduced, and it will also easily lead to vibration of the pumping station unit, which will not work normally, safely and stably

The bottom of the water inlet structure of the existing wet room type pump room often produces attached bottom vortex, and the generation of attached bottom vortex is often at the periphery of the trumpet nozzle facing the bottom plate area of ​​the water inlet structure. Once generated, it will enter the pump with the water flow, affecting The safety and reliability of the water pump, at present, the bottom vortex may be generated under the conditions of various trumpet tube suspension heights

[0003] In order to obtain good water inlet conditions in existing pumping stations, vortex elimination measures such as diversion piers, deflector plates, and diversion cones are often installed in the water inlet structure. Templates need to be erected, which is inconvenient for processing and manufacturing

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