Water conveying valve top water stop cavitation preventing method and structural arrangement

Abstract

The invention discloses a water conveying valve top water stop cavitation preventing method and structural arrangement. A water conveying valve top water stop head cylindrical cavity is utilized as a ventilation transverse pipe, a system ventilation pipeline is formed by arranging a ventilation main steel pipe, a check valve, a ventilation main hose and a ventilation branch pipe, automatic ventilation pipeline ventilation is achieved through the negative pressure generated behind the narrowest fracture surface through narrow slit high-speed jet flow at the beginning of the opening of a water conveying valve, the top water stop cavitation of the water conveying valve is restrained, impact vibration generated at the beginning of the water conveying valve is eliminated, and safe and stable running of the water conveying valve is guaranteed. According to the water conveying valve top water stop cavitation preventing method and the structural arrangement, the structure is simple, operation is easy, and the cavitation preventing effect is obvious.

Description

technical field [0001] The invention relates to a method and structural arrangement, in particular to a water-stopping and anti-cavitation method at the top of a water delivery valve and structural arrangement, which belong to the field of high-speed water flow cavitation and cavitation erosion. Background technique [0002] With the continuous development of my country's water conservancy and hydropower construction, there are more and more high-head giant hydropower stations. In river sections with navigation requirements, the hubs need to build navigable structures. Therefore, the water heads of navigable structures are also increasing. The ship lock is a traditional type of navigable building, which has been widely used at home and abroad. With the development of the large reservoir and high dam, the ship lock is also showing a trend of increasing size and high water head. The representative building in recent years Ship locks such as: Three Gorges continuous five-stage ...

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Problems solved by technology

[0003] Nevertheless, in the current operation of all high head valves, there is still a common cavitation problem that cannot be solved, that is, at the beginning of the valve opening, when the top water is separated from the parapet, a narrow gap is formed between the two. Under the action of the huge water head difference between the front and back of the valve, high-speed jet flow occurs in the narrow gap and then strong cavitation occurs, causing strong impact vibration of the valve, which lasts for more than ten seconds. This phenomenon has been found in many prototype observations of high head ship locks. no good way to solve it

While the cavitation of the top stop water causes the valve to vibrate, the service life of the top stop water itself is obviously shortened under the shearing action of the cavitation water flow, and damage phenomena such as shearing and tearing often occur. Replacement of the water stop requires suspension of the ship for maintenance. has a huge impact on the operational efficiency of

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