Natural aeration system capable of avoiding ship lock valve segment sudden enlarging body type ridge dropping cavitation

Abstract

The invention pertains to the technical field of water conservancy and relates to a natural ventilation method which can reduce the cavitation of a suddenly-expanded drop sill of a valve section of a navigation lock. The method is characterized in that the drop sill adopts a step shape and takes a starting point of an original drop sill as the starting point of a first step of a step-shaped drop sill; after a level surface the first step of the step-shaped drop sill is connected with the second step through a downward curved face; a location where a water flow of the step-shaped drop sill separates is provided with a ventilation system for natural ventilation. By adopting the optimized step-shaped drop sill and the reasonable pipeline distribution, the natural ventilation can be realized in the drop sill; an aeration water flow effectively protects the area where the water flow of the original vertical drop sill separates and covers the cavitation collapsed area of the original drop sill as well as the distance from the front end of a rising sill to a manhole, thus providing protection to a suddenly-expanded bottom plate.

Description

technical field [0001] The invention belongs to the technical field of water conservancy, and relates to a method for anti-cavitation of a ship lock valve, in particular to a natural ventilation method capable of reducing cavitation caused by sudden expansion of the ship lock valve section. Background technique [0002] With the development of the shipping industry and the improvement of the valve research level, the ship lock is entering a period of high water head, and "high water head and large flow" are the main characteristics of the current ship lock. At present, there are more than 50 ship locks with a water head exceeding 20m that have been built or are under construction in my country. Among them, the water head of Caojie Ship Lock is 26.7 meters high, the water head of Yinpan is as high as 36.46 meters, and the maximum water head of Three Gorges Ship Lock is as high as 45.2 meters. [0003] As far as the ship lock is concerned, the water delivery valve is regarded...

AI Technical Summary

Problems solved by technology

For falling sill ventilation, the natural ventilation of the falling sill can only be realized in some small opening ranges, and it cannot be guaranteed to realize natural ventilation in all openings where cavitation occurs in the falling sill. The measure of forced ventilation was once adopted and achieved certain results. However, forced ventilation must be

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