Precise control device for water flow of river physical model

Abstract

The utility model discloses an accurate control device for water flow of a river physical model, which relates to the technical field of hydraulic engineering and comprises an overflow water leveling cabin, a water pump group is mounted on the front side wall of the overflow water leveling cabin, and a flow stabilizing grid is fixed at the position, close to the front end, of the inner side wall of the overflow water leveling cabin. A flow regulating valve is installed on a drainage pipe opening in the middle position of the rear side wall of the overflow water leveling cabin, an electromagnetic flowmeter is installed at the tail end of a pipeline connected to the output end of the flow regulating valve, the flow regulating valve can be a pressure compensation type throttling valve, a secondary buffering assembly is arranged on the rear side part of the overflow water leveling cabin, and the secondary buffering assembly is connected with the overflow water leveling cabin. And the secondary buffer assembly comprises a motor mounting bracket. Input flow and output flow are controlled through the flow stabilizing grid and the flow adjusting valve respectively, water level fluctuation caused by opening and closing of the gate can be effectively buffered, and stability of the water level input into the water supply channel in front of the weir is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy projects, in particular to a precise water flow control device for a river engineering physical model. Background Technique

[0002] As an important tool for water conservancy project research, the river engineering physical model plays an irreplaceable role in flood control and disaster reduction, waterway regulation, hub project design, etc. by scaling and simulating the water flow movement law of real rivers and hydraulic structures. Its core value lies in being able to intuitively reproduce the spatio-temporal evolution process of complex flow fields, revealing the internal mechanisms of key phenomena such as sediment transport, riverbed deformation, and wave propagation, and providing a scientific basis for optimizing engineering plans.

[0003] However, for the current river engineering physical model, the control of the gate and the reading of the water head above the weir both require manual control. It takes a long time to eliminate the influence of the water level fluctuation in the water supply channel in front of the weir caused by the opening and closing of the gate. Moreover, after the target flow rate is adjusted, since the water flow in the pool is always in a moving state, the flow rate output to the water supply channel and the model will fluctuate even if it is adjusted to the target flow rate, and manual adjustment is required in a timely manner, which not only affects the accuracy of the experiment, but also wastes manpower and requires long-term operation, reducing the test efficiency of the model.

[0004] Based on the above existing problems, those skilled in the art have proposed a precise water flow control device for a river engineering physical model. Content of the Utility Model

[0005] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose a precise water flow control device for a river engineering physical model. The designed precise water flow control device for a river engineering physical model can respectively control the input flow rate and the output flow rate through a steady flow grid and a flow regulating valve, effectively buffer the water level fluctuation caused by the opening and closing of the gate, and ensure the stability of the water level input to the water supply channel in front of the weir.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A precise water flow control device for a river engineering physical model, including an overflow and leveling tank. A water pump group is installed on the front side wall of the overflow and leveling tank. A steady flow grid is fixed at a position near the front end of the inner side wall of the overflow and leveling tank. A flow regulating valve is installed at the drain pipe opening in the middle of the rear side wall of the overflow and leveling tank. The end of the pipeline connected to the output end of the flow regulating valve is installed with an electromagnetic flowmeter.

[0008] Preferably, the flow regulating valve can be a pressure-compensated throttle valve.

[0009] Preferably, a secondary buffer assembly is provided at the rear side portion of the overflow water tank. The secondary buffer assembly includes a motor mounting bracket which is mounted on both side walls of the overflow water tank. A driving motor is mounted on the outer side wall of the overflow water tank. The movable end of the driving motor is connected to a rope winding rod. The bottom of the rear side portion of the overflow water tank is rotatably connected to a secondary overflow weir. A plurality of winding ropes are provided at the rear side portion of the secondary overflow weir. The other ends of the plurality of winding ropes are wound around the rope winding rod. An overflow drainage groove is formed on the surface of the secondary overflow weir.

[0010] Preferably, buffer drainage openings are formed on both side portions of the rear side wall of the overflow water tank and on both sides of the electromagnetic flowmeter. A strip valve plate is rotatably connected to the rear inner wall of the overflow water tank through a torsion spring. An elastic pull rope is connected between the secondary overflow weir and the strip valve plate.

[0011] Preferably, a pressure measuring pipeline is fixedly connected to the rear side wall of the overflow water tank and directly in front of the flow regulating valve. The pressure measuring pipeline is communicated with the flow regulating valve. A mounting bracket is fixedly connected to the inner wall of the pressure measuring pipeline. A spring rod is connected inside the mounting bracket through a spring. A switch is provided on the front side wall of the mounting bracket.

[0012] Preferably, inner pressure-dividing drainage openings are formed at both side positions of the rear side wall of the overflow water tank. A pressure-dividing drainage pipe is connected between the inner pressure-dividing drainage openings and the pressure measuring pipeline. One end of the pressure-dividing drainage pipe penetrates through the pressure measuring pipeline and is attached to the outer side wall of the spring rod. The other end of the pressure-dividing drainage pipe is communicated with the inner pressure-dividing drainage opening.

[0013] Beneficial effects

[0014] In the present utility model, water flows into the overflow water tank and accumulates in the front side portion of the overflow water tank. When the water level is higher than the steady flow grid, the water will be discharged into the rear side portion of the overflow water tank, thereby smoothly inputting the flow rate. When the water enters the rear side portion of the overflow water tank, it is discharged through the flow regulating valve. The flow regulating valve can control the discharge flow rate of the water, thereby stabilizing the output flow rate. As an intermediate device, this device can effectively buffer the water level fluctuation caused by the opening and closing of the gate, ensuring the stability of the water level in the water supply channel in front of the weir.

[0015] In the present utility model, when the water level in the rear side portion of the overflow water tank is relatively high and the flow rate of the water flowing into the rear side portion of the overflow water tank is relatively fast, the driving motor drives the rope winding rod to rotate, so that the winding ropes drive the secondary overflow weir to rotate upward, forming a secondary buffer zone between the secondary overflow weir and the steady flow grid. The water flowing across the steady flow grid and entering the overflow water tank first enters the buffer zone formed by the steady flow grid and the secondary overflow weir, and then is discharged into the rear side portion of the overflow water tank through the overflow drainage groove on the secondary overflow weir.

[0016] In the present utility model, when the water flow velocity in the pressure measuring pipeline is too fast, it will drive the spring rod to compress, exposing the pressure-dividing drain pipe. Part of the water flow is discharged through the pressure-dividing drain pipe into the overflow water-level stabilizing tank. By performing pressure division through the pressure-dividing drain pipe, the flow rate of the water entering the flow regulating valve can be made stable. Brief Description of the Drawings

[0017] Figure 1 Fig. is the overall view of a precise water flow control device for a river engineering physical model proposed by the present utility model;

[0018] Figure 2 Fig. is the front schematic view of a precise water flow control device for a river engineering physical model proposed by the present utility model;

[0019] Figure 3 Fig. is the rear schematic view of a precise water flow control device for a river engineering physical model proposed by the present utility model;

[0020] Figure 4 Fig. is the isometric sectional view of a precise water flow control device for a river engineering physical model proposed by the present utility model.

[0021] Legend Explanation:

[0022] Overflow water-level stabilizing tank; 2. Water pump group; 3. Flow stabilizing grid; 4. Secondary buffer assembly; 5. Flow regulating valve; 6. Electromagnetic flowmeter; 7. Elastic pull rope; 8. Spring-loaded valve plate; 9. Buffer drain port; 10. Inner pressure-dividing drain port; 11. Pressure measuring pipeline; 12. Pressure-dividing drain pipe; 13. Spring rod; 14. Installation bracket;

[0023] 41. Motor installation bracket; 42. Driving motor; 43. Rope winding rod; 44. Secondary overflow weir; 45. Overflow drain trough; 46. Winding rope. Detailed Embodiment

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Embodiment: Refer to Figures 1 - 4, an embodiment provided by the present utility model, a precise water flow control device for a river engineering physical model, includes an overflow and leveling tank 1. A water pump group 2 is installed on the front side wall of the overflow and leveling tank 1. A steady flow grid 3 is fixed at a position near the front end of the inner side wall of the overflow and leveling tank 1. A flow regulating valve 5 is installed on the drain pipe opening at the middle position of the rear side wall of the overflow and leveling tank 1. The end of the pipe connected to the output end of the flow regulating valve 5 is installed with an electromagnetic flowmeter 6. This device is arranged in front of the weir front water supply channel, used to buffer and eliminate the influence of the water level fluctuation in the weir front water supply channel caused by the opening and closing of the gate. The water in the gate is pumped by the water pump, and the water flow enters the overflow and leveling tank 1 and accumulates in the front part of the overflow and leveling tank 1. When the water level is higher than the steady flow grid 3, the water will be discharged into the rear part of the overflow and leveling tank 1, and then the flow rate is stably input. When the water enters the rear part of the overflow and leveling tank 1, it is discharged through the flow regulating valve 5. The flow regulating valve 5 can control the discharge flow rate of the water flow, and then stably output the flow rate. By using this device as an intermediate device, the water level fluctuation caused by the opening and closing of the gate can be effectively buffered, ensuring the stability of the water level input to the weir front water supply channel.

[0026] The flow regulating valve 5 can be selected as a pressure compensated throttle valve. The pressure compensated throttle valve can automatically adjust the opening according to the pressure difference between the upstream and downstream to keep the flow rate constant, avoiding the influence of the water level difference in the rear part of the overflow and leveling tank 1 on the flow rate. The flow regulating valve 5 can select a pressure compensated throttle valve of SRE4-G3 / 4-01X / 70, which mainly realizes stable flow control through the balance of variable orifice and spring force.

[0027] A secondary buffer assembly 4 is arranged in the rear part of the overflow and leveling tank 1. The secondary buffer assembly 4 includes a motor mounting bracket 41. The motor mounting bracket 41 is installed on the two side walls of the overflow and leveling tank 1. A driving motor 42 is installed on the outer side wall of the overflow and leveling tank 1. The movable end of the driving motor 42 is connected with a rope winding rod 43. The rear part of the bottom of the overflow and leveling tank 1 is rotatably connected with a secondary overflow weir 44. A plurality of winding ropes 46 are arranged at the rear part of the secondary overflow weir 44. The other ends of the plurality of winding ropes 46 are wound on the rope winding rod 43. An overflow drainage groove 45 is arranged on the surface of the secondary overflow weir 44. When the water level in the rear part of the overflow and leveling tank 1 is relatively high and the water flow velocity input to the rear part of the overflow and leveling tank 1 is relatively fast, the driving motor 42 drives the rope winding rod 43 to rotate, so that the winding ropes 46 drive the secondary overflow weir 44 to rotate upward, forming a secondary buffer area between the secondary overflow weir 44 and the steady flow grid 3. The water flow that crosses the steady flow grid 3 and enters the overflow and leveling tank 1 first enters the buffer area formed between the steady flow grid 3 and the secondary overflow weir 44, and then is discharged into the rear part of the overflow and leveling tank 1 through the overflow drainage groove 45 on the secondary overflow weir 44.

[0028] On the rear side wall of the overflow water level equalizing tank 1 and on both sides of the electromagnetic flowmeter 6, buffer drainage ports 9 are provided. A spring valve plate 8 is rotatably connected to the rear inner wall of the overflow water level equalizing tank 1 through a torsion spring. A elastic pull rope 7 is connected between the secondary overflow weir 44 and the spring valve plate 8. When the secondary overflow weir 44 rotates upward, the spring valve plate 8 is driven to open through the elastic pull rope 7, and then the buffer drainage ports 9 on both sides are opened, and drainage is assisted through the buffer drainage ports 9 to prevent the water flow velocity into the flow regulating valve 5 from being too fast and affecting the smoothness of the water flow discharged by the flow regulating valve 5. A pressure measuring pipeline 11 is fixedly connected to the rear side wall of the overflow water level equalizing tank 1 and directly in front of the flow regulating valve 5. The pressure measuring pipeline 11 is communicated with the flow regulating valve 5. An installation bracket 14 is fixedly connected to the inner wall of the pressure measuring pipeline 11. A spring rod 13 is connected to the inside of the installation bracket 14 through a spring. A switch is arranged on the front side wall of the installation bracket 14. When the water flow velocity into the pressure measuring pipeline 11 is too fast, it will press the spring rod 13 to contract backward until the rear part of the spring rod 13 fits with the switch. After the switch is triggered, it controls the driving motor 42 to work.

[0029] Inner pressure dividing drainage ports 10 are provided at both side positions on the rear side wall of the overflow water level equalizing tank 1. A pressure dividing drainage pipe 12 is connected between the inner pressure dividing drainage ports 10 and the pressure measuring pipeline 11. One end of the pressure dividing drainage pipe 12 penetrates through the pressure measuring pipeline 11 and fits with the outer side wall of the spring rod 13. The other end of the pressure dividing drainage pipe 12 is communicated with the inner pressure dividing drainage ports 10. When the water flow velocity into the pressure measuring pipeline 11 is too fast, it will drive the spring rod 13 to compress, exposing the pressure dividing drainage pipe 12, and part of the water flow is discharged from the overflow water level equalizing tank 1 through the pressure dividing drainage pipe 12. By performing pressure division through the pressure dividing drainage pipe 12, the flow rate into the flow regulating valve 5 can be made stable.

[0030] Working principle: This device is installed in front of the water supply channel in front of the weir, and is used to buffer and eliminate the influence of the water level fluctuation in the water supply channel in front of the weir caused by the opening and closing of the gate. The water in the gate is pumped by a water pump, and the water flow enters the overflow leveling chamber 1 and accumulates in the front side part of the overflow leveling chamber 1. When the water level is higher than the steady flow grid 3, the water will be discharged into the rear side part of the overflow leveling chamber 1, and then the flow rate is smoothly input. When the water enters the rear side part of the overflow leveling chamber 1, it is discharged through the flow regulating valve 5. The flow regulating valve 5 can control the discharge flow rate of the water flow, and then stabilize the output flow rate. As an intermediate device, this device can effectively buffer the water level fluctuation caused by the opening and closing of the gate, and ensure the stability of the water level input into the water supply channel in front of the weir. When the water level in the rear side part of the overflow leveling chamber 1 is relatively high and the water flow velocity entering the rear side part of the overflow leveling chamber 1 is relatively fast, it will press the spring rod 13 to contract backward until the rear side part of the spring rod 13 fits with the switch. After being triggered, the switch controls the driving motor 42 to work. The driving motor 42 drives the winding rod 43 to rotate, so that the winding rope 46 drives the secondary overflow weir 44 to rotate upward, so that a secondary buffer zone is formed between the secondary overflow weir 44 and the steady flow grid 3. The water flow that crosses the steady flow grid 3 and enters the overflow leveling chamber 1 first enters the buffer zone formed by the steady flow grid 3 and the secondary overflow weir 44, and then is discharged into the rear side part of the overflow leveling chamber 1 through the overflow drainage groove 45 on the secondary overflow weir 44. When the secondary overflow weir 44 rotates upward, it drives the leaf spring valve plate 8 to open through the elastic pull rope 7, and then opens the buffer drainage ports 9 on both sides. The buffer drainage ports 9 assist in drainage to prevent the water flow velocity entering the flow regulating valve 5 from being too fast and affecting the stability of the water flow discharged by the flow regulating valve 5. When the spring rod 13 is compressed, the pressure-dividing drain pipe 12 is exposed, and part of the water flow is discharged from the overflow leveling chamber 1 through the pressure-dividing drain pipe 12. By dividing the pressure through the pressure-dividing drain pipe 12, the flow rate entering the flow regulating valve 5 can tend to be stable.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water flow precision control device for a river engineering physical model, characterized by: The invention comprises an overflow leveling tank (1), wherein a water pump group (2) is installed on the front side wall of the overflow leveling tank (1), a flow stabilizing grid (3) is fixed on the inner side wall of the overflow leveling tank (1) near the front end, a flow regulating valve (5) is installed on the drainage pipe outlet at the middle position of the rear side wall of the overflow leveling tank (1), and an electromagnetic flow meter (6) is installed at the end of the pipe connected to the output end of the flow regulating valve (5).

2. The device for accurately controlling water flow of a river engineering physical model according to claim 1 is characterized by: The flow regulating valve (5) is a pressure-compensated throttle valve.

3. The device for accurately controlling water flow of a river engineering physical model according to claim 1 is characterized by: A secondary buffer assembly (4) is arranged at the rear side of the overflow leveling tank (1), the secondary buffer assembly (4) comprising a motor mounting bracket (41), the motor mounting bracket (41) being mounted on both side walls of the overflow leveling tank (1), a driving motor (42) being mounted on the outer side wall of the overflow leveling tank (1), a rope winding rod (43) being connected to the movable end of the driving motor (42), a secondary overflow weir (44) being rotatably connected to the bottom of the rear side of the overflow leveling tank (1), a plurality of winding ropes (46) being arranged at the rear side of the secondary overflow weir (44), the other ends of the plurality of winding ropes (46) being wound on the rope winding rod (43), and an overflow drainage groove (45) being provided on the surface of the secondary overflow weir (44).

4. The device for accurately controlling water flow of a river engineering physical model according to claim 3 is characterized by: A buffer drain port (9) is provided on the rear side wall of the overflow tank (1) and on both sides of the electromagnetic flowmeter (6); a spring-loaded valve plate (8) is rotatably connected to the rear inner wall of the overflow tank (1) via a torsion spring; and an elastic pull rope (7) is connected between the secondary overflow weir (44) and the spring-loaded valve plate (8).

5. The device for accurately controlling water flow of a river engineering physical model according to claim 1 is characterized by: A pressure measuring pipe (11) is fixedly connected to the rear side wall of the overflow leveling tank (1) and is located directly in front of the flow regulating valve (5). The pressure measuring pipe (11) is in communication with the flow regulating valve (5). A mounting bracket (14) is fixedly connected to the inner wall of the pressure measuring pipe (11). A spring rod (13) is connected to the interior of the mounting bracket (14) via a spring. A switch is provided on the front side wall of the mounting bracket (14).

6. The device for accurately controlling water flow of a river engineering physical model according to claim 5 is characterized by: Internal pressure-dividing drain ports (10) are provided at both sides of the rear side wall of the overflow leveling tank (1), and a pressure-dividing drain pipe (12) is connected between the internal pressure-dividing drain port (10) and the pressure measuring pipe (11), one end of the pressure-dividing drain pipe (12) passes through the pressure measuring pipe (11) and is attached to the outer side wall of the spring rod (13), and the other end of the pressure-dividing drain pipe (12) is connected to the internal pressure-dividing drain port (10).

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