A device for attracting fish and continuously lifting fish in a circular track

Abstract

The application relates to a device for attracting fish and continuously circulating and lifting fish in a ring-shaped track, and relates to the technical field of fish passing through a high dam of a hydropower station. The device comprises a fish-attracting channel, a fish deflecting weir and a fish lifting assembly. The fish-attracting channel is located downstream of the high dam. The fish deflecting weir is arranged in the fish-attracting channel. The fish lifting assembly comprises fish conveying boxes, a track and a power unit. The track is arranged on the high dam and downstream of the high dam, the track is ring-shaped and extends downwards along the high dam to the fish-attracting channel, at least two fish conveying boxes are arranged and used for conveying fish entering the fish-attracting channel, each fish conveying box is hung below the track, and the power unit is used for driving the fish conveying boxes to move along the track. The device has the effects of continuously circulating and lifting fish and improving the fish passing efficiency.

Description

Technical Field

[0001] This invention relates to the field of fish passage technology for high dams in hydropower stations, specifically to a device for attracting fish and continuously raising fish in a circular track. Background Technology

[0002] The construction and operation of permanent river-blocking structures with functions such as power generation, flood control, and irrigation obstructs the connectivity between upstream and downstream river channels, affects fish migration, hinders gene exchange among fish, and leads to a corresponding reduction in biological genetic diversity. Therefore, it is necessary to build fish passage facilities to mitigate the impact of the project on the aquatic ecosystem.

[0003] In traditional fish passage facilities, fishways are more commonly used due to their simple structure and construction, as well as low operating and management costs. However, fishways are more suitable for dams with low water heads. For high dam structures, the differences in water level and flow between upstream and downstream are too large, the fishway length is long, the construction cost is high, and the layout is difficult. Traditional fishways cannot solve this type of fish passage problem. On the other hand, fish lifts are more adaptable to fish passage under high dams and water level fluctuations. Therefore, fish lifts are more suitable for fish passage facilities under high dams.

[0004] Commonly used fish lift structures require manual intervention using fish-driving barriers to attract fish. After the fish enter the attraction channel, the barriers drive them to a collection box, which is then lifted. The lifting process utilizes a combination of electric vertical lifting and long-distance transport via highway to the upstream area. The fish lift vertically raises the collection box to an observation room, from where it is transferred to a transport truck on the highway. The fish are then transported to the upstream waters. The entire process is complex, involves long distances, and is time-consuming. The fish in the collection box must be transferred to the transport truck before the box can be lowered back into the attraction channel for the next round of fish collection. This discontinuous process results in low efficiency. Summary of the Invention

[0005] This invention provides a device for attracting fish and continuously raising fish in a circular track.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a device that combines fish attraction and continuous fish lifting in a circular track, including a fish attraction channel, a lifting sill and a fish lifting component;

[0007] The fish-attracting channel is located downstream of the high dam;

[0008] The shovel is set inside the fish-attracting channel;

[0009] The fish-lifting assembly includes a fish transport box, a track, and a power unit. The track is erected on the high dam and downstream of the high dam. The track is circular and extends downward along the high dam to the fish-attracting channel. There are at least two fish transport boxes for transporting fish into the fish-attracting channel. Each fish transport box is suspended below the track. The power unit is used to drive the fish transport box to move along the track.

[0010] There are three fish transport boxes.

[0011] The sills are provided in multiple parallel configurations.

[0012] The width, height, and position of each of the aforementioned ledges are different.

[0013] It also includes a water turbine located on the tailrace channel of the high dam water conveyance system and used to power the fish-lifting assembly.

[0014] The track includes an inner ring and an outer ring. Several supporting steel frames are vertically installed on the sidewalls and downstream of the high dam. The supporting steel frames pass through the inner ring and are connected to both the inner ring and the outer ring.

[0015] The fish transport box is vertically equipped with a fixed rod, and a sliding rod is vertically equipped at the top of the fixed rod. The sliding rod moves along the inner ring and the outer ring through the power unit.

[0016] Both the inner ring and the outer ring include a first segment, a second segment, and a third segment. The first segment is parallel to the top of the high dam, the second segment is parallel to the side wall of the high dam, and the third segment is parallel to the fish-attracting channel.

[0017] The fish transport box has an inlet and an outlet that are positioned opposite each other, and both the inlet and outlet are equipped with roller shutter gates. The fish transport box is equipped with a fish-blocking net at the outlet.

[0018] The fish transport box has multiple partitions vertically arranged on its two opposite inner side walls. The partitions are staggered and are all opposite to the inlet of the fish transport box.

[0019] The fish transport box is equipped with an underwater fish monitor, and the fish transport box is equipped with solar panels for providing power to the roller shutter gate and the underwater fish monitor.

[0020] By employing the above technical solutions, the present invention has the following beneficial effects compared to the prior art:

[0021] 1. The circular track allows each fish transport box to move along the track, continuously lifting fish in a loop, thus improving fish handling efficiency.

[0022] 2. Using a water turbine to power the fish-lifting system reduces electricity consumption and saves energy. The water turbine also provides some resistance to the downstream water flow, preventing the fish from having difficulty surfacing due to excessive flow velocity.

[0023] 3. By changing the height and position of the sill, different types of fish can be attracted to the fish collection channel by varying the flow rate. At the same time, by adjusting the turbine speed, the flow rate of the tailwater in the water conveyance system can be affected, thereby changing the flow rate in the fish attraction channel and achieving the goal of attracting a variety of target fish.

[0024] 4. The fish transport box is designed with partitions, which can guide fish to enter the fish transport box automatically, and also provide a place for fish to rest, providing a comfortable environment for fish. At the same time, the fish transport box can be regarded as part of the fish attraction channel, effectively shortening the length of the fish attraction channel. Attached Figure Description

[0025] The invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram illustrating the distribution of the ridges in this invention;

[0028] Figure 3 This is a schematic diagram illustrating the shape of the sloping platform according to the present invention;

[0029] Figure 4 This is a schematic diagram illustrating the orbital distribution of the present invention;

[0030] Figure 5 This is a schematic diagram illustrating the supporting steel frame of the present invention;

[0031] Figure 6 This is a schematic diagram illustrating the fish transport box of the present invention.

[0032] In the diagram: 1. Fish-attracting channel; 11. Diversion embankment; 21. Fish transport box; 211. Roller shutter gate; 212. Fish-blocking net; 213. Partition; 214. Underwater fish monitor; 215. Solar panel; 22. Track; 221. Inner ring; 222. Outer ring; 23. Supporting steel frame; 24. Fixed rod; 25. Sliding rod; 26. Control room; 3. Water turbine; 4. High dam. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

[0034] like Figure 1 As shown, the present invention provides a device for continuously circulating fish lifting using a circular track, comprising a fish-attracting channel 1, a lifting sill 11, a fish lifting assembly, and a water turbine 3.

[0035] like Figure 1 and Figure 2 As shown, the fish-attracting channel 1 is located downstream of the high dam 4; the sill 11 is set inside the fish-attracting channel 1, and there are three types of sill 11. The width, height and position of the three types of sill 11 are different. The three types of sill 11 are parallel to each other and distributed in a triangular shape.

[0036] like Figure 2 and Figure 3 As shown, the three types of sills 11 have different effects on increasing the flow velocity in the fish-attracting channel 1, and can attract fish with different preferences for flow velocity, thus having a higher tolerance for fish species.

[0037] The fish-attracting channel is 4.3m wide and 0.15m thick. The widths of the three types of sills are set to 0.8m, 1.2m and 2m respectively, and the heights are set between 0.6m and 1.5m. After the sills are set, the flow velocity range in the fish-attracting channel can be adjusted to 0.7m / s-1.5m / s.

[0038] The Lancang River originates in Zadoi County, Qinghai Province. Within the county, the main stream is approximately 2153 km long, with a natural drop of 4583 m and an average gradient of 2.13‰. The upper reaches of the Lancang River have a narrow, V-shaped valley with robust mountains on both sides. The relatively intact terrain of the mountain slopes on both sides of the valley provides suitable conditions for constructing conventional hydroelectric power stations. The difference in elevation between the mountain peaks and the river channel can reach 100 m, allowing for a maximum dam height of 160 m.

[0039] The Lancang River Dam is consistent with the technical solution of this application. The Lancang River basin is home to fish species such as the Chinese carp, Lancang schizothorax, and Schizothorax glabra. Among them, the sustained upstream current velocity of the Chinese carp is between 0.54 m / s and 0.70 m / s, the sustained upstream current velocity of the Lancang schizothorax is between 0.70 and 1.05 m / s, and the sustained upstream current velocity of the Schizothorax glabra is between 0.71 and 1.42 m / s. Since the flow velocity range within the fish-attracting channel 1 can be adjusted to 0.7 m / s to 1.5 m / s after the three types of embankments 11 are set up, it can meet the upstream current velocity requirements of the Chinese carp, Lancang schizothorax, and Schizothorax glabra, fully demonstrating the applicability and application effect of the device.

[0040] like Figure 1 and Figure 4 As shown, the fish lifting assembly includes a fish transport box 21, a track 22 and a power unit. The track 22 is erected above the high dam 4 and downstream of the high dam 4. The track 22 is circular and extends downward along the inclined direction of the side wall of the high dam 4 to the fish attraction channel 1.

[0041] The track 22 includes an inner ring 221 and an outer ring 222. Several supporting steel frames 23 are vertically installed on the side wall and downstream of the high dam 4. The supporting steel frames 23 pass through the inner ring 221 and are connected to both the inner ring 221 and the outer ring 222.

[0042] Both the inner ring 221 and the outer ring 222 consist of a first section, a second section, and a third section. The first section is parallel to the top of the high dam 4, the second section is parallel to the sidewall of the high dam 4, and the third section is parallel to the fish-attracting channel 1. The first and second sections are both arc-shaped, and the second section connects to both the first and second sections. The circular track 22 is designed to conform to the downstream dam body and river channel, thus improving stability and safety.

[0043] At least two fish transport boxes 21 are provided for transporting fish into the fish attraction channel 1. The preferred technical solution of this application is three fish transport boxes 21, with a certain distance between each fish transport box 21.

[0044] like Figure 5 and Figure 6 As shown, each fish transport box 21 is vertically equipped with a fixed rod 24, and a sliding rod 25 is vertically equipped at the top of the fixed rod 24. The fish transport box 21 is suspended below the track 22 by the sliding rod 25. The sliding rod 25 moves along the inner ring 221 and the outer ring 222 through the power unit, driving the fish transport box 21 to move along the track 22, thereby realizing the lifting and lowering of the fish transport box 21.

[0045] The power unit includes two sets of pulleys and a second motor. Both sets of pulleys are located at the bottom of the sliding rod 25, and are situated within the inner ring 221 and outer ring 222 of the track 22, respectively. The two opposing pulleys are connected by a rotating shaft, which is rotatably connected to the sliding rod 25. The second motor is mounted on the sliding rod 25 and drives the rotating shaft to rotate. The rotating shaft drives the pulleys to rotate, causing them to roll along the track 22, thereby moving the sliding rod 25. The sliding rod 25 then drives the fish transport box 21 to run along the track 22. The power unit can also employ a track-walking robot or an overhead track conveyor, among other structures.

[0046] Each fish transport box 21 has a relatively positioned inlet and outlet, both equipped with roller shutter gates 211, which can be remotely controlled. The roller shutter gate 211 is driven by a first motor that powers a small gear. The small gear rotates a chain, which in turn drives a large gear. The large gear then drives a rotating shaft to lift the roller shutter upwards. Door slots are provided on both sides of the roller shutter to control its lifting direction and prevent it from swaying back and forth. A fish net 212 is installed at the outlet of the fish transport box 21 to prevent fish from directly passing through it.

[0047] like Figure 2 As shown, the fish transport box 21 has multiple partitions 213 vertically arranged on both inner side walls. The partitions 213 are staggered and all face the inlet of the fish transport box 21. The partitions 213 can form a stable water flow zone, providing a resting space for fish. An underwater fish monitor 214 is installed inside the fish transport box 21 to monitor the number of fish entering the fish transport box 21.

[0048] like Figure 6 As shown, the fish transport box 21 is equipped with solar panels 215 for providing power to the roller shutter gate 211 and the underwater fish monitor 214.

[0049] like Figure 1 As shown, turbine 3 is located on the tailrace of the high dam 4 water conveyance system and is used to power the fish-lifting assembly. The upstream water flow from the water conveyance system of the high dam 4 impacts the blades of turbine 3, causing the turbine 3 shaft to rotate, thereby driving the generator to power the entire fish-lifting assembly. In actual construction, an operating room 26 can be arranged on the top of the dam to control the operation of the fish-lifting assembly.

[0050] The principle of this technical solution is as follows: When the fish transport box 21 is connected to the fish attraction channel 1, the first motor is controlled to open the roller shutter gates 211 on both sides. Fish enter the fish transport box 21 through the fish attraction channel 1 and the inlet. After the underwater fish monitor 214 detects that the number of fish has reached the required level, it closes the roller shutter gates 211. The second motor starts, driving the first fish transport box 21 to move along the track 22 to the top of the high dam 4. After the first fish transport box 21 moves to the high dam 4, the roller shutter gate 211 on the inlet side of the fish transport box 21 faces the upstream water area and opens, releasing the fish in the fish transport box 21 into the upstream water area. After the fish are released, the fish transport box 21 moves downward. At this time, the fish transport box 21 moves downward by its own weight, and due to inertia, after entering the third section of the track 22, the fish transport box 21 will continue to move forward for a distance and stop at the bottom of the track 22 to connect with the fish attraction channel 1.

[0051] Three fish transport boxes 21 move along a circular track 22. The first fish transport box 21 is located at the bottom of the track 22 and connected to the fish-attracting channel 1, in a fish-collecting state. The second fish transport box 21 is located at the top of the track 22, in a fish-releasing state. The third fish transport box 21 is in a state of moving towards the high dam 4 after being loaded with fish. The three fish transport boxes 21 form a continuous cycle for fish lifting, improving fish passage efficiency. The fish transport boxes 21 use their own weight to descend on the track 22, which can save energy consumption. Furthermore, the third section of the track 22 is designed to provide a buffer when the fish transport boxes 21 descend using their own weight.

[0052] Three different types of sills 11 with varying widths and heights are installed within the fish-attracting channel 1. The sills 11 can be used to alter the flow rate within the channel to varying degrees. The location of the fish-attracting channel 1 can be adjusted to a lower position to meet the upstream migration requirements of different target fish species, attracting them to enter the channel 1 autonomously and migrate upstream to the fish transport box 21, thus minimizing disturbance and harm to the fish.

[0053] The turbine 3 utilizes the significant water level difference between the upstream and downstream sections of the high dam 4 structure to drive a generator that powers the entire fish-lifting assembly. Simultaneously, the opening of the fish transport box 21 gate is powered by solar panels 215, eliminating the need for additional power supply and thus saving energy. The turbine 3 provides resistance to the downstream water flow, preventing excessive flow velocity from hindering fish migration. By adjusting the turbine 3's rotational speed, the flow velocity of the tailwater in the water conveyance system is influenced, regulating the downstream flow and creating a suitable flow velocity within the fish passage based on the habits of the target fish species.

[0054] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0055] The meaning of "and / or" as used in this application includes both situations where each exists alone or both exist simultaneously.

[0056] The term "connection" as used in this application can mean a direct connection between components or an indirect connection between components through other components.

[0057] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A device that combines fish-attracting and continuous fish-lifting via a circular track, characterized in that, It includes a fish-attracting channel (1), a lifting sill (11), a fish-lifting assembly, and a water turbine (3); The fish-attracting channel (1) is located downstream of the high dam (4); The pick-up bar (11) is set inside the fish-attracting channel (1); The fish lifting assembly includes a fish transport box (21), a track (22), and a power unit; the track (22) is erected on the high dam (4) and downstream of the high dam (4), the track (22) is circular and extends downward along the high dam (4) to the fish attraction channel (1), at least two fish transport boxes (21) are provided, used to transport fish into the fish attraction channel (1), each fish transport box (21) is suspended below the track (22), and the power unit is used to drive the fish transport box (21) to move along the track (22); The fish transport box (21) has an inlet and an outlet arranged opposite to each other. The fish transport box (21) is provided with a fish-blocking net (212) at the outlet. The fish transport box (21) has multiple partitions (213) vertically arranged on both of its opposite inner side walls. The partitions (213) are staggered and are all opposite to the inlet of the fish transport box (21). The turbine (3) is located on the tailrace of the high dam (4) water conveyance system and is used to supply power to the fish lifting assembly; The fish transport box (21) is equipped with roller shutter gates (211) at both the inlet and outlet.

2. The device for attracting fish and continuously raising fish in a circular track according to claim 1, characterized in that, The fish transport box (21) is provided in three parts.

3. The device for attracting fish and continuously raising fish in a circular track according to claim 1, characterized in that, The sill (11) is provided in multiple parallel configurations.

4. The device for attracting fish and continuously raising fish in a circular track according to claim 3, characterized in that, The width, height and position of each of the aforementioned ledges (11) are different.

5. The device for attracting fish and continuously raising fish in a circular track according to claim 1, characterized in that, The track (22) includes an inner ring (221) and an outer ring (222). Several supporting steel frames (23) are vertically provided on the side wall of the high dam (4) and downstream of the high dam (4). The supporting steel frames (23) pass through the inner ring (221) and are connected to both the inner ring (221) and the outer ring (222). The fish transport box (21) is vertically provided with a fixed rod (24), and the top of the fixed rod (24) is vertically provided with a sliding rod (25). The sliding rod (25) moves along the inner ring (221) and the outer ring (222) through the power unit.

6. The device for attracting fish and continuously raising fish in a circular track according to claim 5, characterized in that, The inner ring (221) and the outer ring (222) each include a first segment, a second segment and a third segment. The first segment is parallel to the top of the high dam (4), the second segment is parallel to the side wall of the high dam (4), and the third segment is parallel to the fish-attracting channel (1).

7. The device for attracting fish and continuously raising fish in a circular track according to claim 6, characterized in that, The fish transport box (21) is equipped with an underwater fish monitor (214), and the fish transport box (21) is equipped with a solar panel (215) for providing power to the roller shutter gate (211) and the underwater fish monitor (214).

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