Stable drop flow annular overflow weir of one-way concentrated inflow type vertical shaft

The stable drop flow annular overflow weir is formed by sequentially connecting a left flow guide ridge, an overflow weir body and a right flow guide ridge, the connecting line directly faces the concentrated inflow direction, the overflow weir body is arranged at an inlet in the top of the vertical shaft, and the left flow guide ridge and the right flow guide ridge are symmetrically arranged on the two sides of the outer portion of the overflow weir body. According to the stable drop flow annular downflow weir of the one-way concentrated inflow type vertical shaft, the flow guide ridges with the same structural type and size are symmetrically arranged on the two sides of the downflow weir, the path of upstream one-way concentrated water flow flowing to the downflow weir is cut off, the flow direction of the water flow is changed under blocking of the flow guide ridges, the concentrated main flow is scattered, and the flow direction is changed. And the swirl flow phenomenon around the weir disappears, so that