Hydraulic automatic constant water level downflow weir

Abstract

The hydraulic automatic constant level downflow weir installation includes water pool, water-supplying pipe communicated with water pool, water inlet pipe and overfall. The water pool is formed from upstream water pool and downstream water pool, the upstream water pool and downstream water pool are communicated by means of vertical channel, the water-supplying pipe and water inlet pipe are communicated with up stream water pool, and the interior of the vertical channel is equipped with a balance box body capable of upward and downward moving along the vertical channel, and a rectangular thin-wall weir plate is fixedly connected with one side of upper end of balance body near by downstream. It can utilize hydraulic force to automatically regulate overflow quantity to retain constant level.

Description

technical field [0001] The invention relates to a hydraulic automatic constant water level overflow weir device. Background technique [0002] When it comes to hydraulic or water conservancy engineering tests or engineering applications, it is often necessary to maintain a constant water level or head so that the discharge or control of the flow is convenient and achieves a certain accuracy. For example, in water engineering, hydraulics, river simulation and other tests, the water level stability of the water supply source is very important, it can ensure that the test flow rate is released accurately, and the flow rate is easy to adjust, thereby improving the simulation accuracy of the test. In the actual model test, due to the water supply flow Q 供 It is often unstable due to factors such as voltage and reservoir water level; the test water Q 用 Due to the test requirements, it will be adjusted at any time, which will also cause changes in the water level of the water sup...

AI Technical Summary

Problems solved by technology

However, in practical applications, flat pools are often limited by the space of the site, the area is generally not very large, and the working head is not high

If the flow of the model test is relatively large and the flow is adjusted frequently during the test, the water level in the pool will vary greatly in this case, which will have a greater impact on the release of the test water flow

Specifically, if it is necessary to adjust the valve to obtain a certain flow in the test, even if the required flow is regulated very accurately in an instant, the water level in the flat pool will change due to the change of the release flow. , that is, the test water supply head changes, and this change then in turn affects the just adjusted discharge flow

If you want to manually adjust a certain flow rate, it often takes a long time to repeatedly correct it to obtain a certain flow rate that meets the accuracy requirements, but this can only be achieved without time constraints. For those who need In the test of simulating the flow release process, there is still a time simulation in the test, which is limited by time, and it is almost impossible to release accurate flow at this time

In such a simulation test, the process of flow change is not accurately simulated, which may completely lead to distortion of the test simulation.

In addition, the release of flow will change the water level in the flat pool, and the change of water level will in turn affect the flow. This effect is delayed in time. The length of the lag time is usually related to the flow inertia of the entire water supply system, and it is difficult to control it through manual adjustment or Electromechanical regulation approach to eliminate this effect

Therefore, obtaining a constant water level by leveling the pool is only an approximate treatment method, but cannot really achieve the purpose of constant water level (or working head)

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