Water flow diffusion device for the end of the fishway fish attracting and water supply pipe

Abstract

The present invention discloses a water flow diffusion device for the end of a water supply pipe for attracting fish in a fishway, belongs to the technical field of water conservancy and hydropower engineering, and provides a water flow diffusion device for the end of a water supply pipe for attracting fish in a fishway, which can replenish water more smoothly and dispersedly, including a water supply pipe and a water supply groove arranged at the bottom or side wall of a water inlet of the fishway, wherein the water outlet port of the water supply pipe is located in the water supply groove, and a water stabilizing grid flush with the wall surface of the fishway is arranged at the mouth of the water supply groove. The present invention arranges a water supply groove structure, firstly discharges the water of the water supply pipe into the water supply groove, and then, with the help of the water stabilizing grid at the mouth of the water supply groove, the water stabilizing grid plays a role in dispersing and rectifying the water flow of the water supply, so that the water supply is more dispersed and stable; at the same time, due to the increase in the outlet area of ​​the water supply system, the outlet flow rate of the water supply system can be controlled below the flow rate at the vertical seam of the fishway, so that the fish can migrate upward along the fishway.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a water flow diffusion device used at the end of a fishway fish attracting and water replenishing pipe. Background Art

[0002] With the increasing attention paid to ecological protection, in order to avoid the blocking of migratory fish migration channels by river-blocking dams, new hydropower projects usually require the construction of supporting fish passage facilities such as fishways and fish lifts. The height difference between the upstream reservoir water level and the downstream tailwater water level of low-dam power stations is relatively small, the engineering investment for building fishways is controllable, and the later operation and maintenance workload is relatively small. Fishways can be considered as a priority for fish passage facilities. In order for fish in the downstream river channel to sense the water flow at the entrance of the fishway and accurately find the entrance, and at the same time form a water flow velocity suitable for fish upstream migration in the fishway, a corresponding fish-attracting and water-supplementing pipeline system needs to be set up in the fishway.

[0003] At present, the end of the pipeline of the fishway water supply system of the hydropower station mostly adopts the method of multiple water supply branch pipes, that is, after the main water supply pipe leads from the water source to the corresponding water supply part of the fishway, the main water supply pipe leads to multiple water supply branch pipes to disperse the water directly into the fishway. The main disadvantages of this solution are:

[0004] 1. There is no pressure relief measure at the end of the water supply branch pipe.

[0005] 2. Multiple water supply branch pipes led out from the main water supply pipe disperse water directly into the fishway; if the number of water supply branch pipes is small, the water supply flow rate at the outlet of the water supply branch pipe is too large. If the water supply flow rate is greater than the flow rate through the seam, the fish will gather at the outlet of the water supply branch pipe, unable to sense the flow rate through the seam of the vertical seam of the fishway and migrate upstream of the fishway; if the number of water supply branch pipes is increased to reduce the water supply flow rate at the outlet of the branch pipes, the number of water supply branch pipes will increase greatly, which is difficult to achieve due to the limitation of the structural size of the fishway itself.

[0006] 3. There are no measures to clear the accumulated sand in the fishway. The fishway is out of service during the non-fishing season. The out-of-service period is relatively long, and a large amount of river sand will be deposited in the fishway. Artificial dredging is required before the fishway is put back into operation the following year.

[0007] In addition, although the bottom water replenishment pool replenishes water relatively evenly, it is more prone to sand accumulation. Summary of the invention

[0008] The technical problem solved by the present invention is to provide a water flow diffusion device for the end of a fishway fish-attracting water-replenishing pipe, which can replenish water more stably and dispersedly.

[0009] The technical solution adopted by the present invention to solve its technical problems is: a water flow diffusion device used at the end of a fishway fish-attracting water-supply pipe, comprising a water-supply pipe and a water-supply groove arranged at the bottom or side wall of a fishway water inlet, the water outlet port of the water-supply pipe is located in the water-supply groove, and a water-stabilizing grille flush with the wall of the fishway is arranged at the mouth of the water-supply groove.

[0010] Furthermore, the water outlet port of the water supply pipe faces downward.

[0011] Furthermore, it also includes a three-way branch pipe arranged in the water supply tank, the water outlet port of the water supply pipe is connected to the three-way branch pipe, the three-way branch pipe is arranged along the water flow direction of the fishway, and the three-way branch pipe is provided with at least two water outlets at intervals.

[0012] Furthermore, each water outlet of the three-way branch pipe faces downward.

[0013] Furthermore, a pressure reducing orifice plate is arranged at each water outlet.

[0014] Furthermore, the bars of the water-stabilizing grille are inclined in the direction of the water flow in the fishway.

[0015] Furthermore, the bars of the water stabilizing grid are inclined at 0 to 60 degrees relative to the water flow direction of the fishway.

[0016] Furthermore, it also includes an air supply and purge pipe, the outlet end of which is located in the water replenishment tank and faces downward. The air supply and purge pipe can supply air or purge water into the water replenishment tank, and a sand discharge hole is provided at the bottom of the water stabilizing grid.

[0017] Furthermore, the air supply and purge pipe is provided with a nozzle as an outlet end.

[0018] Furthermore, a plurality of air supply and purge pipes are arranged in the water replenishment tank, and the air supply and purge pipes are arranged at intervals.

[0019] The beneficial effects of the present invention are as follows: the present invention provides a water supply pipe and a water supply trough, first uses the water supply pipe to discharge water into the water supply trough, and then disperses and rectifies the water supply flow with the help of the water stabilizing grille at the mouth of the water supply trough, so that the water supply flow is more dispersed and stable; at the same time, the water stabilizing grille increases the outlet area of ​​the water supply flow, and the water supply flow rate at the outlet of the water stabilizing grille can be controlled below the flow rate at the vertical seam of the fishway, which is convenient for fish to migrate upward along the fishway. In addition, the water outlet port of the water supply pipe is located in the water supply trough and faces downward to avoid silt blocking the water return port of the water supply pipe. In addition, the three-way branch pipe can play the role of dispersing the water outlet port of the water supply pipe, dispersing the single water outlet port of the water supply pipe to multiple water outlets arranged on the three-way branch pipe, so as to achieve dispersed water discharge. In addition, a pressure reducing orifice is provided at the water outlet of the three-way branch pipe, and the pressure reducing orifice plays the role of reducing the water outlet pressure. In addition, the air supply and purge pipe can be fed with gas when air supply is needed, so as to realize air supply while replenishing water. When the accumulated silt needs to be blown away, high-pressure air flow or water flow can also be supplied for blowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic elevation view of a water flow diffusion device used at the end of a fishway fish attracting and water replenishing pipe according to the present invention.

[0021] Figure 2 It is a plan view of a water flow diffusion device used at the end of a fishway fish attracting and water replenishing pipe according to the present invention.

[0022] Figure 3 for Figure 1 Schematic diagram of the X direction.

[0023] Markings in the figure: water supply pipe 1, side wall 2, water supply trough 3, water stabilizing grid 4, three-way branch pipe 5, water outlet 6, pressure reducing orifice 7, air supply and purge pipe 8, sand discharge hole 9, nozzle 10, grid bar 11. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 3 As shown, the water replenishment trough 3 is arranged on the side wall 2 near the water inlet of the fishway, the water outlet port of the water replenishment pipe 1 is arranged in the water replenishment trough 3, the water flow transported by the water replenishment pipe 1 is directly discharged into the water replenishment trough 3, and the mouth of the water replenishment trough 3 is provided with a water stabilizing grid 4 flush with the wall surface of the side wall 2 of the fishway. The water discharged from the water replenishment pipe 1 is dispersed through the water stabilizing grid 4 at the mouth of the water replenishment trough 3, and then flows into the fishway. The water stabilizing grid 4 plays the role of dispersing and rectifying the water replenishment flow, making the water replenishment flow more dispersed and stable, and the water stabilizing grid 4 also effectively increases the outlet area of ​​the water replenishment flow, and the water replenishment flow rate at the outlet of the water stabilizing grid can be controlled below the flow rate at the vertical seam of the fishway, which is convenient for fish to migrate upward along the fishway.

[0026] In addition, in order to prevent sediment from clogging the water outlet port of the water supply pipe 1, the water outlet port of the water supply pipe 1 is preferably oriented downward.

[0027] In addition, the present invention also includes a three-way branch pipe 5 disposed in the water replenishment tank 3, the water outlet port of the water replenishment pipe 1 is connected to the three-way branch pipe 5, the three-way branch pipe 5 is disposed along the direction of the water flow in the fishway, and the three-way branch pipe 5 is provided with at least two water outlets 6 at intervals. The three-way branch pipe 5 can play the role of dispersing the water outlet port of the water replenishment pipe 1, dispersing the single water outlet port of the water replenishment pipe to multiple water outlets 6 disposed on the three-way branch pipe 5, so as to achieve dispersed water outlet, which can further improve the dispersion effect of the water replenishment flow. More specifically, each water outlet 6 of the three-way branch pipe 5 is oriented downward, and a branch pipe section oriented downward can be further installed on the three-way branch pipe 5 to form a water outlet 6, which can be specifically arranged with reference to the structure shown in the accompanying drawings.

[0028] In addition, in order to reduce the pressure at the water outlet 6 , a pressure reducing orifice plate 7 is further provided at each water outlet 6 , and the pressure reducing orifice plate 7 can be installed at the water outlet 6 through a flange.

[0029] The function of the water stabilizing grid 4 is to disperse and rectify the water flow. In addition, in order to make the replenishing water flow discharged from the water stabilizing grid 4 more conducive to attracting fish, such as the attached Figure 2 As shown, it is preferred that the inclination direction of the bars 11 of the water stabilizing grid 4 is set to be along the direction of the water flow in the fishway, and the direction of the water flow discharged through the bars 11 of the water stabilizing grid 4 is roughly toward the direction of the water flow in the fishway. More specifically, the bars 11 of the water stabilizing grid 4 can be set to be inclined by 0 to 60 degrees relative to the direction of the water flow in the fishway, for example, 30 degrees.

[0030] In addition, the present invention also includes an air supply and purge pipe 8, the outlet end of which is located in the water replenishment tank 3 and faces downward, and the air supply and purge pipe 8 can supply air or purge water into the water replenishment tank 3. At the same time, a sand discharge hole 9 is provided at the bottom of the water stabilizing grid 4, and the sand discharge hole 9 is more conducive to blowing and discharging sand. The air supply and purge pipe 8 can realize two different functions of air supply and sludge purge according to needs. When air needs to be introduced, gas can be supplied to the air supply and purge pipe 8. When sludge needs to be purged, high-pressure gas or liquid can be introduced into the air supply and purge pipe 8 to purge and clear the sludge in the water replenishment tank 3. It is particularly suitable for sludge cleaning when the fish luring system is restarted after being stopped for a long time during the non-fishing period.

[0031] More specifically, in order to improve the purging effect of the air supply and purge pipe 8, the air supply and purge pipe 8 is further provided with a nozzle 10 as an outlet end.

[0032] In addition, in order to improve the air supply dispersion effect or the purge dispersion effect of the water supply tank 3, the present invention can also be provided with a plurality of air supply and purge pipes 8, and each air supply and purge pipe 8 is arranged at intervals. Figure 1 and Figure 2 In the example shown, the air supply and purge pipes 8 are arranged in two layers, each layer including two air supply and purge pipes 8 .

Claims

1. A water flow diffusion device used at the end of a fishway fish attracting and water supply pipe, characterized in that: The invention comprises a water supply pipe (1), a water supply groove (3) arranged at the bottom or side wall (2) of the fishway water inlet, and a three-way branch pipe (5) arranged in the water supply groove (3); the water outlet port of the water supply pipe (1) is located in the water supply groove (3) and is connected to the three-way branch pipe (5); the three-way branch pipe (5) is arranged along the water flow direction of the fishway; the three-way branch pipe (5) is provided with at least two water outlets (6) at intervals; each water outlet (6) of the three-way branch pipe (5) faces downward, and each water outlet (6) is provided with a pressure reducing orifice plate (7); the mouth of the water supply groove (3) is provided with a water stabilizing grille (4) flush with the wall surface of the fishway; the bars (11) of the water stabilizing grille (4) are inclined in the direction of the water flow direction of the fishway; The invention also comprises an air supply and purge pipe (8), the outlet end of which is located in the water replenishment tank (3) and faces downwards, the air supply and purge pipe (8) is provided with a nozzle (10), and the air supply and purge pipe (8) can supply air or purge water into the water replenishment tank (3), and the bottom of the water stabilizing grid (4) is provided with a sand discharge hole (9).

2. The water flow diffusion device for the end of the fishway fish attracting and water replenishing pipe as claimed in claim 1, characterized in that: The water outlet port of the water supply pipe (1) faces downward.

3. The water flow diffusion device for the end of the fishway fish attracting and water replenishing pipe as claimed in claim 1, characterized in that: The bars (11) of the water stabilizing grid (4) are inclined at 0 to 60 degrees relative to the direction of the water flow in the fishway.

4. The water flow diffusion device for the end of the fishway fish attracting and water replenishing pipe as claimed in claim 1, 2 or 3, characterized in that: A plurality of air supply and purge pipes (8) are arranged in the water replenishment tank (3), and the air supply and purge pipes (8) are arranged at intervals.

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