CN211554756U - Small-sized tail gate non-constant water level monitoring system for hydraulic model test - Google Patents

Abstract

The utility model relates to a water level monitoring system. The technical scheme is as follows: a small-sized tail gate non-constant water level monitoring system for a hydraulic model test comprises a hydraulic model with a model tail gate water level monitoring area, a frequency converter and a water level automatic monitoring system connected with the frequency converter; the method is characterized in that: the system also comprises a water stabilizing grid wall, a first overflow weir and a second overflow weir which are sequentially arranged at the tail part of the model tail gate water level monitoring area at intervals according to the water flow direction, a tail gate control pool is arranged between the water stabilizing grid wall and the first overflow weir, a small-sized regulating and storing pool is arranged between the first overflow weir and the second overflow weir, and a tail water channel is arranged behind the second overflow weir; the top end of the first overflow weir is provided with a first overflow port, and the middle part of the first overflow weir is provided with a drain pipe which penetrates through the wall body and a water inlet pipe which is provided with a submersible pump; and a second overflow port is arranged at the top end of the second overflow weir. The facility has the advantages of less investment, strong adaptability and convenient operation.

Description

A small tailgate non-constant water level monitoring system for hydraulic model test

technical field

The utility model relates to a water level monitoring system, in particular to a small tailgate non-constant water level monitoring system for hydraulic model test.

Background technique

Hydraulic model test is one of the important means to verify and optimize the project layout in the preliminary design of water conservancy projects. It is also clearly stated in the design specifications for sluices, spillways and pumping stations that for large-scale or medium-sized projects with complex flow conditions, hydraulic engineering should be carried out. Model test.

Model tailgate water level control is a routine work in hydraulic model test research, and it is a necessary condition to ensure that the upstream water level, flow velocity, flow pattern and other hydrodynamic similarities. However, in actual work, due to the differences in the size of the test site, the model area, and the shape of the upstream and downstream rivers, it is difficult to set the tailgate in a unified position. It has a certain randomness; in actual operation, the water level control of the tailgate also needs to be manually adjusted; when encountering an unsteady flow, it is carried out by a combination of preparatory test and step control, which requires a certain amount of manpower and time. There may also be some impact on the test accuracy. Therefore, it is necessary to propose a non-constant automatic control and monitoring device for the tailgate water level that is small in size and easy to disassemble, so as to improve the accuracy of the model test and the convenience of the testers.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the above-mentioned background technology, and provide a small tailgate non-constant water level monitoring system for hydraulic model test, which should have less investment, strong adaptability and convenient operation.

The technical scheme of the present utility model is:

A small tailgate non-constant water level monitoring system for hydraulic model test, comprising a hydraulic model with a model tailgate water level monitoring area, a frequency converter and an automatic water level monitoring system connected to the frequency converter; characterized in that: the The system also includes a water stabilization grid wall, a first overflow weir and a second overflow weir, which are arranged at intervals at the tail of the water level monitoring area of the model tailgate according to the water flow direction, and the space between the water stabilization grid wall and the first overflow weir is The tailgate control pool, between the first overflow weir and the second overflow weir is a small adjustment and storage tank, and behind the second overflow weir is the tail water channel; the top of the first overflow weir is provided with a first overflow port The middle part of the first overflow weir is provided with a drain pipe penetrating the wall and a water inlet pipe equipped with a submersible pump; the top of the second overflow weir is provided with a second overflow port.

An automatic water level meter connected to an automatic water level monitoring system is configured in the water level monitoring area of the model tailgate.

The position of the first overflow port is higher than the position of the second overflow port, but lower than the height of the two side retaining walls.

The position of the second overflow port is lower than the height of the tailrace retaining wall.

The automatic water level monitoring system includes a power switch, a frequency converter for connecting the submersible pump, and a monitoring system for connecting the automatic water level meter and the frequency converter.

The working principle of the utility model is as follows: reading the error between the target water level and the actual water level in the hydraulic model, and adjusting the power of the water pump to achieve the purpose of correcting the error, the system can automatically adjust the working frequency of the water inlet pump and correct the flow rate in the water inlet pipe. After superimposing the upstream downstream flow, the water level in the tailgate control pool is gradually raised or lowered to achieve the purpose of effectively controlling the water level in the tailgate area of the model.

The beneficial effects of the present utility model are:

After the device of the utility model is installed, the model tailgate can be automatically controlled, and the test personnel can directly set the target water level value or the process line, and monitor and adjust the current water level in the model in real time, thereby improving the test accuracy and reducing manual adjustment errors and manpower. It has the advantages of energy investment; when the model is completed, the disassembly is also more convenient, with the advantages of less investment, strong adaptability and convenient operation.

Description of drawings

FIG. 1 is a plan view of the utility model.

FIG. 2 is a longitudinal sectional layout view of the utility model (the top view direction of FIG. 1 ).

FIG. 3 is a schematic diagram of the arrangement structure of the instruments in the control box of the present invention.

Detailed ways

The present utility model will be further described below through the examples. The present examples are only used to describe the present utility model more clearly and completely, but should not be construed as limiting the protection scope of the present utility model. Those skilled in the art make Some non-essential improvements and other instances of adjustment belong to the scope of protection of the present invention.

As shown in the picture, the small tailgate non-constant water level monitoring system used for hydraulic model test includes setting a hydraulic model with model tailgate water level monitoring area 1, a frequency converter and an automatic water level monitoring system; model tailgate water level monitoring The area is equipped with an automatic water level meter 5 to feed back the actual control water level of the model test area in real time.

The improvement of the utility model is that water stabilization grid walls 6, first overflow weirs 7 and second overflow weirs 10 are sequentially and spaced at the tail of the model tailgate water level monitoring area according to the direction of water flow (the direction shown by the arrow in the figure). ; Thus, a tailgate control pool 2 is formed between the water stabilization grid wall and the first overflow weir, which is used to stabilize the water level in the downstream control area of the model and avoid large water surface fluctuations in the model tailgate water level monitoring area; the first overflow weir A drain pipe 8 penetrating the wall and a water inlet pipe equipped with a submersible pump 11 are arranged in the middle of the first overflow weir, a first overflow port is arranged at the top of the first overflow weir, and a second overflow outlet is arranged at the top of the second overflow weir. Orifice; after the second overflow weir is the tailrace 4. The small adjustment and storage tank 3 formed between the first overflow weir and the second overflow weir together with the drain pipe 8, the water inlet pipe 9 and the submersible pump 11 constitutes a water level adjustment and storage circulation system; When the overflow capacity of the drainage pipe 8 is exceeded, the excess water can be discharged through the first overflow weir 7 . In addition, the position of the first overflow port is higher than the position of the second overflow port, but lower than the height of the two side retaining walls 17 .

The bottom position of the second overflow port is lower than the height of the tailrace retaining wall 18 .

The utility model is also equipped with a water level automatic monitoring system 13 including a monitor in the control box 12 (the water level automatic monitoring system is an outsourced conventional device, and the automatic water level meter and the frequency converter are connected through wires), a frequency converter 14 and a power switch. 15 (the power switch connects the external power supply and the submersible pump), used to track and adjust the working frequency of the submersible pump 11 (the submersible pump is connected to the inverter through the wire), so as to increase or decrease the total drain flow.

The utility model adjusts the overall discharge flow of the model through a small regulating tank, an automatic water level meter and a frequency conversion device, so as to achieve the purpose of raising and lowering the water level in the tailgate water level monitoring area of the model tailgate control model, and is suitable for a certain downward flow or tidal influence. Relatively weak flood control area; if it is aimed at the downstream of an open model with a large tidal volume, it is generally difficult for a small pool to reach the water volume required for the rapid rise of the tide, and the pool can be enlarged or controlled by a tidal model.

The size of the outlet pipe, the inlet pipe and the power of the submersible pump required for adjusting the reservoir need to be set and debugged according to the actual needs of the model, so as to avoid poor drainage of the outlet pipe when the water level of the model is low or insufficient water inlet capacity of the pump when the water level is high. The first overflow weir is mainly used in the model debugging stage, and the top elevation shall not be lower than the maximum water level value required for model control, and it must also meet the overflow size required for flood peak flow.

The water level monitoring and control system can preset the target water level or process line, use the frequency converter to remotely control the submersible pump, and feed back the actual water level of the model in real time through the automatic water level meter to continuously correct and approach the target value.

Claims (5)

1. A small tailgate non-constant water level monitoring system for hydraulic model test, comprising a hydraulic model with a model tailgate water level monitoring area, a frequency converter (14) and an automatic water level monitoring system connected to the frequency converter; It is characterized in that: the system further comprises a water-stabilizing grid wall (6), a first overflow weir (7) and a second overflow weir (10) arranged at intervals at the tail of the water level monitoring area of the model tailgate in sequence according to the direction of the water flow; Between the water stabilization grid wall and the first overflow weir is a tailgate control pool (2), between the first overflow weir and the second overflow weir is a small adjustment storage pool (3), and after the second overflow weir It is a tailrace channel (4); the top of the first overflow weir is provided with a first overflow port, and the middle part of the first overflow weir is provided with a drain pipe running through the wall and a water inlet pipe equipped with a submersible pump; the second The top of the overflow weir is provided with a second overflow port. 2. The small-scale tailgate non-constant water level monitoring system for hydraulic model test according to claim 1 is characterized in that: the model tailgate water level monitoring area is configured with an automatic water level meter connected to an automatic water level monitoring system (5). 3. The small tailgate non-constant water level monitoring system for hydraulic model test according to claim 2, characterized in that: the position of the first overflow port is higher than the position of the second overflow port, but lower than two Side retaining wall (17) height. 4. The non-constant water level monitoring system for a small tailgate for hydraulic model test according to claim 3, wherein the position of the second overflow is lower than the height of the tailrace retaining wall (18). 5. The small tailgate non-constant water level monitoring system for hydraulic model test according to claim 4, characterized in that: said water level automatic monitoring system (13), frequency converter (14) and power switch (15) All are arranged in the control box (12).

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