Turbofan shaped graded drop type vertical shaft

Abstract

The invention discloses a turbofan shaped graded drop type vertical shaft. The turbofan shaped graded drop type vertical shaft comprises a vertical shaft body and an exhaust pipe which are coaxially arranged, and an annular area is formed between the inner wall of the vertical shaft body and the outer wall of the exhaust pipe; the upper end of the annular area is connected to a water inlet canal, multiple vortex plates are evenly distributed on the annular area at equal intervals from the top to the bottom, and the lower end of the annular area is connected to a storage tunnel access opening; the vortex plate comprises a sector plate, the tail end of the outflow edge of the sector plate is in an arc shape, and the arc bends along water flow toward the front side; the vortex plate at the first layer is connected to the water inlet canal, the tail end of each layer of the vortex plate is connected to the head end of the next layer of the vortex plate on a horizontal projection plane, and a graded vortex type water flow channel is formed in the annular area. In the turbofan shaped graded drop type vertical shaft, by utilizing multiple grades of the vortex plates in the vertical shaft and utilizing an aerification effect of fallen water flow and a turbulent motion diffusion effect of upper water cushions of the vortex plates, the flow speed of let-down water flow is lowered, the vertical shaft energy dissipation effect is improved, and cavitation and cavitation erosion of a local area of the vertical haft can be effectively inhibited at the same time.

Description

technical field [0001] The invention relates to the technical field of drainage engineering, in particular to a scroll fan-shaped graded drop shaft. Background technique [0002] The inflow shaft in the municipal engineering storage tunnel system usually needs to adapt to the requirements of different inflow flow and water drop depth according to the pipeline layout characteristics. At the same time, due to the limitation of the ventilation holes in the municipal engineering layout, the inflow shaft usually needs to take into account the needs of system exhaust. In order to make full use of the original shield working shaft of the storage tunnel, reduce the occupied area and re-excavate, the deep tunnel system often adopts a vertical shaft structure with inflow from the circumference and ventilation and exhaust in the middle. This type of inflow Shafts are usually compact in structure, can make full use of the vertical space of the shaft, and can meet the requirements of sha...

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Problems solved by technology

However, due to centrifugal force, this type of inflow shaft has a common problem, that is, the downward swirling flow spirals down along the outer wall of the shaft, and the outer water surface is significantly higher than the inner water surface. If it is too large, the water flow will concentrate on the outside of the shaft. On the one hand, this will significantly reduce the effective flow area of ​​the discharge water flow, affect the discharge flow of the shaft, and reduce the flow capacity of the shaft. The overall energy dissipation effect, and it is not good for the smooth transition of the water flow in the bottom regulation and storage tunnel, which may have a negative impact on the safe and stable operation of the deep tunnel system

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