Combined ventilation method for relieving cavitation of large water-level amplitude high-lift ship lock valve

Abstract

The invention relates to a combined ventilation method for relieving cavitation of a high-lift ship lock valve, in particular to a combined ventilation method for relieving cavitation of a large water-level amplitude high-lift ship lock valve; by adopting a simple uniform cross section flat top type valve section gallery body type and shallow valve section gallery laying depth, in the design, the gallery is ensured to have a certain negative pressure when the high-level head of the ship lock is operated, the natural ventilation of a door head is used as a basic measure, and the natural ventilation of the top of the gallery is used as a supplement measure for the natural ventilation of the door head, by utilizing combined ventilation of the door head and the top of the gallery, cavitation is fully inhibited; when water level combination is changed, a water head is reduced, and negative pressure of the top of the gallery passes away and the natural ventilation can not be carried out, the natural ventilation of the door head is used for solving the problem of bottom flange cavitation of the valve. The method can well solve the problem of cavitation of the large water-level amplitude high-lift ship lock valve, and the construction difficulty of the valve section gallery is reduced, so as to be convenient for overhauling of the valve section gallery, save construction investment and reduce operation cost.

Description

technical field [0001] The invention relates to a combined ventilating method for reducing cavitation of ship lock valves with high water head, in particular to a combined ventilating method for reducing cavitation of ship lock valves with large water level and variable amplitude and high water head. Background technique [0002] With the development of the shipping industry and the improvement of the research level of valves, the construction of ship locks has gradually developed towards high water heads. 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 the Dahua Ship Lock is 29.0m, the water head of the Letan Ship Lock is 29.1m, the water head of the Yinpan Ship Lock is 36.46m, and the Three Gorges Ship Lock has a water head of 29.0m. The maximum water head of the lock is as high as 45.2m. These high-head ship locks are mainly concentrated on the rivers ...

AI Technical Summary

Problems solved by technology

[0005] Under normal circumstances, complex valve section corridors are often used in projects, and the embedding depth of valve sections is appropriately increased, and various ventilation measures are combined to solve the cavitation problem of high-head ship lock valves. The burial depth of the large valve section will greatly increase the engineering volume and construction difficulty, and at the same time, the natural ventilation measures at the top of the corridor cannot adapt to the conditions of large water level fluctuations

Therefore, on the premise of ensuring safety, how to solve the valve cavitation problem of large water level variable amplitude high head ship locks in mountainous rivers in western my country through relatively simple and economical measures has become a problem that construction, design and scientific researchers are very concerned about. There are few successful cases in this area at home and abroad for reference

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