A fish guiding device for fishway entrance

Abstract

The invention discloses a fish guide device for a fishway entrance, comprising two parallel supporting frames and a plurality of partitions connected between the supporting frames, wherein the partitions are arranged at intervals along the length direction of the supporting frames and can move along the length direction of the supporting frames, and the partitions can rotate around the connection between the partitions and the supporting frames. The invention has the advantage of improving the rate of fish migration.

Description

Technical Field

[0001] The invention relates to the field of water conservancy and hydropower, and in particular to a fish guiding device used at an inlet of a fishway. Background Art

[0002] In the research of attracting fish at the entrance of fishways, it is currently recognized that the most economical and effective method is to form a fish-attracting water flow at the entrance of the fishway, and use the fish's tendency to flow to attract them into the fishway. Therefore, the water flow at the entrance of the fishway is both a means of attracting fish and an obstacle that fish must overcome to enter the fishway. Its flow rate should be greater than the induced flow rate of the target fish and less than the critical flow rate of the fish.

[0003] The tailwater of a power station is an ideal gathering place for fish. A large number of fish gather in the tailwater, and the layout of fishway inlets here has good application prospects. However, when the fishway inlet is set near the tailwater of the power station building, the downstream water flow of the turbine easily blurs the fish-attracting water flow, thereby reducing the fish-attracting efficiency of the fishway inlet. Although the fishway inlet is arranged in the tailwater, due to the poor location, when the power station is running, the flow field conditions deteriorate, the flow velocity in the tailwater area is large, and the flow velocity in most areas is greater than the limit flow velocity of fish. It is difficult for fish to reach the fishway inlet smoothly, and fish cannot find the fishway inlet to continue upstream.

[0004] Currently, most of the fishway inlets arranged near the tailrace have their layout fixed during the construction period. They can only function under specific flow field conditions and are difficult to optimize and adjust later. They cannot adapt to changes in the flow field under different discharge conditions, resulting in poor fish entry effects. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a fish guiding device for a fishway entrance which can improve the fish upstream rate.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A fish guide device for a fishway entrance comprises two parallel support frames and a plurality of partitions connected between the support frames. The partitions are arranged at intervals along the length direction of the support frames and can move along the length direction of the support frames. The partitions can rotate around the connection between the partitions and the support frames.

[0008] As a further improvement of the above technical solution:

[0009] The partition includes a connecting end and a sliding end, wherein the connecting end is connected to a supporting frame, and the sliding end is slidably connected to another supporting frame.

[0010] The sliding end is provided with a roller, the support frame is provided with a track, and the roller is slidably connected with the track.

[0011] The connection end is provided with a screw, the support frame is composed of two brackets arranged in parallel, and the screw passes through the gap between the two brackets and is connected with the partition.

[0012] Assume that the angle between the partition and the support frame is α, which satisfies 40°≤α≤45°.

[0013] Assume that the width of the partition is B, the spacing between adjacent partitions is D, and D = 0.5~0.7B.

[0014] The surface of the partition away from the fishway entrance is the front side, and the partition is arranged to face away from the flow direction of the tail water of the power station.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The partitions of the present invention are arranged at intervals along the length direction of the support frame and can move along the length direction of the support frame, and the partitions can rotate around the connection between the partitions and the support frame. By adjusting the rotation angle of the partitions and the spacing between the partitions, a fish passage with a suitable flow rate and close to the side wall is formed, so that the fish can smoothly reach the entrance of the fishway and improve the fish upstream rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the fish guide device used for the fishway entrance of the present invention.

[0018] Figure 2 The invention is a schematic diagram of the installation of a fish guide device for a fishway entrance.

[0019] Figure 3 The figure is a three-dimensional structural schematic diagram of a fish guide device used for a fishway entrance of the present invention.

[0020] The reference numerals in the figure indicate: 1, support frame; 2, partition; 21, connecting end; 22, sliding end; 3, support member. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0022] Embodiment 1:

[0023] like Figures 1 to 3 As shown, the fish guide device for the fishway entrance of this embodiment comprises two parallel support frames 1 and a plurality of partitions 2 connected between the support frames 1, the partitions 2 are arranged at intervals along the length direction of the support frames 1 and can move along the length direction of the support frames 1, and the partitions 2 can rotate around the connection between the partitions 2 and the support frames 1. The present invention forms a fish channel with a suitable flow rate and close to the side wall by adjusting the rotation angle of the partitions 2 and the spacing between the partitions 2, so that the fish can smoothly reach the fishway entrance and improve the fish upstream rate.

[0024] In the present invention, the angle between the partition 2 and the support frame 1 is α, which satisfies 40°≤α≤45° (45° in this embodiment), the width of the partition 2 is B, the spacing between adjacent partitions 2 is D, and D=0.5~0.7B. When there is no fish guide device of the present invention, the water flow velocity v1 of the fish channel at the entrance of the fishway is greater than 2m / s. When the fish guide device of the present invention is used, the water flow velocity v1 of the fish channel at the entrance of the fishway is 0.8~1.0m / s, and the water flow velocity v2 between the partitions 2 is 0.4~0.6m / s. This water flow velocity is suitable for carp species to go upstream.

[0025] The partition plate 2 includes a connecting end 21 and a sliding end 22 . The connecting end 21 is connected to one supporting frame 1 , and the sliding end 22 is slidably connected to another supporting frame 1 .

[0026] The sliding end 22 is provided with a roller, and the support frame 1 is provided with a track, and the roller is slidably connected to the track.

[0027] The connection end 21 is provided with a screw. The support frame 1 is composed of two brackets arranged in parallel. The screw passes through the gap between the two brackets and is connected to the partition plate 2.

[0028] like Figure 2 As shown, Figure 2 The top line is the dam axis, Q1 is the tailwater flow of the power station, Q2 is the fishway flow, Q3 is the flow to the auxiliary fish inlet, Q4 is the flow to the main fish inlet, and the fish guide device also includes a support 3, one end of the support frame 1 is fixed to the outer wall on one side of the fishway entrance, one end of the support 3 is connected to the other end of the support frame 1, and the other end is fixed to the outer wall on the other side of the fishway entrance.

[0029] The partition 2 can be made of concrete or steel, one end of which is connected to the bracket by screws and can be adjusted in angle. The other end uses rollers to move the partition 2 along the length direction of the support frame 1 and adjust the spacing between the partitions 2.

[0030] In this embodiment, when the fish guide device is installed on the outer wall of the fishway entrance, the surface of the partition 2 away from the fishway entrance is the front side, and the front side of the partition 2 faces away from the water flow direction of the power station tailwater ( Figure 2 The water flow direction (v2) between the baffles 2 forms an acute angle with the water flow direction (v1) of the fish passage at the fishway inlet. In this way, the baffles 2 block the tailwater of the power station, weakening the impact of the tailwater of the power station on the fishway inlet, so that a flow field environment suitable for carp fish to swim upstream is formed near the fishway inlet. If the baffles 2 are arranged facing the water flow direction of the tailwater of the power station, the baffles 2 do not block the tailwater of the power station, and the tailwater of the power station can easily pass through the baffles 2 arranged at intervals, affecting the flow field at the fishway inlet.

[0031] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A fish guide device for a fishway entrance, characterized in that: It comprises two support frames (1) arranged in parallel and a plurality of partitions (2) connected between the support frames (1) and arranged in parallel, the partitions (2) being arranged at intervals along the length direction of the support frames (1) and being movable along the length direction of the support frames (1), and the partitions (2) being rotatable around the connection between the partitions (2) and the support frames (1); Assuming that the included angle between the partition (2) and the support frame (1) is α, it satisfies 40°≤α≤45°; Assume that the width of the partition (2) is B, the distance between adjacent partitions (2) is D, and D=0.5-0.7 B; The fish guide device is arranged close to the tailwater channel of the power station, with the surface of the baffle (2) away from the fishway entrance as the front side, and the baffle (2) is arranged facing away from the flow direction of the tailwater of the power station; The fish guide device further comprises a support member (3), one end of the support frame (1) being fixed to an outer side wall on one side of the fishway entrance, one end of the support member (3) being connected to the other end of the support frame (1), and the other end being fixed to the outer side wall on the other side of the fishway entrance.

2. The fish guiding device according to claim 1, characterized in that: The partition plate (2) comprises a connecting end (21) and a sliding end (22), wherein the connecting end (21) is connected to one supporting frame (1), and the sliding end (22) is slidably connected to another supporting frame (1).

3. The fish guiding device according to claim 2, characterized in that: The sliding end (22) is provided with a roller, the support frame (1) is provided with a track, and the roller is slidably connected to the track.

4. The fish guiding device according to claim 2, characterized in that: The connection end (21) is provided with a screw, the support frame (1) is composed of two brackets arranged in parallel, and the screw passes through the gap between the two brackets and is connected to the partition plate (2).

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