Dam structure and construction method thereof

Abstract

The dam structure comprises a dam body, openings are formed in the front end and the rear end of the dam body, flow velocity reduction structures rotationally connected to the dam body are arranged between the openings in the two ends of the dam body, and the distance between the flow velocity reduction structures is smaller than the width of the openings of the dam body. An atomization structure penetrating through the outer side wall of the flow speed reduction structure is contained in the flow speed reduction structure, and an inflation structure is connected to the flow speed reduction structure in a meshed mode, fixed to the dam body and communicated with the inner side of the atomization structure; a water pumping structure is arranged at the bottom end of the flow velocity reduction structure and extends upwards to penetrate through the top end of the flow velocity reduction structure, and the dam body extends backwards corresponding to the top end of the water pumping structure and communicates with a water return channel; the front end of the dam body is rotationally connected with a control gate, and a power assisting structure is connected between the control gate and the flow speed reduction structure in an engaged mode. The dam structure has the effect that oxygenation and noise reduction are conducted on water flow of the overflow opening, and the surrounding ecology is improved as much as possible.

Description

Technical Field

[0001] The present application relates to the technical field of water conservancy engineering, and in particular to a dam structure and a construction method thereof. Background Art

[0002] Reservoir dams play an important role in the development of the national economy and have a significant impact on agricultural development, industrial construction, and people's production and life. At the beginning of dam design, more consideration was given to safety, economy and durability, and the impact on the environment was rarely considered. However, with the continuous development of social economy, environmental development has also been put on the agenda.

[0003] Dams are usually designed with overflow outlets to control water levels. Excess water is discharged through the overflow outlets at normal times. However, the water discharged from the overflow outlets of the original dams flows at a high speed and has a high noise level, and the impact force cannot be underestimated. This leads to a scarcity of flora and fauna at the overflow outlets, which is not beneficial to the ecological environment. In response to the above-mentioned related technologies, the applicant has proposed a dam structure that can increase oxygen and reduce noise for the overflow outlet water flow, so as to improve the surrounding ecology as much as possible. Summary of the invention

[0004] In order to provide a dam structure for oxygenating and reducing the noise of overflow water flow and to improve the surrounding ecology as much as possible, the present application provides a dam structure and a construction method thereof.

[0005] The present application provides a dam structure and a construction method thereof using the following technical solutions:

[0006] A dam structure comprises a dam body, openings are arranged at the front and rear ends of the dam body, flow velocity reduction structures which are rotatably connected to the dam body are arranged between the openings at the two ends of the dam body, the spacing between the flow velocity reduction structures is smaller than the width of the openings of the dam body, the flow velocity reduction structure is provided with an atomization structure which is penetrated through the outer wall of the flow velocity reduction structure, an air pumping structure is meshedly connected on the flow velocity reduction structure, the air pumping structure is fixed to the dam body and connected to the inner side of the atomization structure; a water pumping structure is arranged at the bottom end of the flow velocity reduction structure, the water pumping structure extends upward and penetrates through the top end of the flow velocity reduction structure, the dam body extends backward corresponding to the top end of the water pumping structure and is connected with a return water channel; a control gate is rotatably connected to the front end of the dam body, and a power assisting structure is meshedly connected between the control gate and the flow velocity reduction structure.

[0007] By adopting the above technical solution, the setting of the flow rate reduction structure can effectively disperse the water flow energy and reduce the force directly impacting the dam body, thereby slowing down the water flow speed, reducing the erosion of the riverbed and both banks, and protecting the stability of the surrounding environment; the dam structure, through the comprehensive application of fluid mechanics principles and modern engineering technology, not only strengthens the protective function of the dam itself, but also takes into account environmental protection, effective utilization of resources and ecological balance.

[0008] Preferably, the flow rate reduction structure includes a drain roller and a diversion water channel, the drain rollers are rotatably connected to the two sides of the dam body, and the distance between the drain rollers is smaller than the opening of the dam body, and the rotating axis of the drain roller is arranged perpendicular to the ground; the diversion water channel is sleeved on the outside of the drain roller, and the two ends of the diversion water channel extend outward and smoothly connect to the openings at both ends of the dam body, and the inclined surface of the extended end of the diversion water channel intersects with the corresponding drain roller.

[0009] By adopting the above technical solution, the setting of the discharge roller can effectively capture and disperse the water flow. Its rotation action further consumes the energy of the water flow, reduces the force directly impacting the dam body, and protects the environment from erosion and damage by high-intensity water flow. The smooth and continuous diversion waterway design helps fish and other aquatic organisms to pass safely, reduces the impact on the ecosystem, embodies the concept of ecological water conservancy engineering, and is conducive to maintaining the ecological balance of the river.

[0010] Preferably, the atomization structure includes an inner sleeve, air holes and a drainage channel, the inner sleeve is vertically accommodated inside the drag drum, and a gap is left between the outer wall of the inner sleeve and the side wall of the drag drum; the air holes are arranged at intervals on the side wall of the drag drum and connected to the gap between the drag drum and the inner sleeve; one end of the drainage channel is fixed and connected to the gap between the drag drum and the inner sleeve, and the other end extends through the bottom center of the drag drum.

[0011] By adopting the above technical solution, aeration holes are opened at intervals on the side wall of the drain drum, and air flows through these holes into the gap between the inner sleeve and the drain drum, collides and mixes with the water flow to form tiny bubbles, which greatly improves the atomization degree of the water body and enhances the oxygen content of the water body.

[0012] Preferably, the inflation structure includes an air pump, an air inlet pipe and an air pumping pipe, the air pump is fixed to the dam body and meshingly connected to the rotating shaft of the drag roller; the air inlet pipe is connected to the air pump and extends upward to pass through the dam body; the air pumping pipe is connected to the air pump and extends downward, and the extended end of the air pumping pipe is provided with a connecting structure rotatably connected to the drag roller, and the connecting structure extends downward to be connected to the gap between the drag roller and the inner sleeve.

[0013] Preferably, the connecting structure includes a fixed cover, a rotating chamber and a connecting air pipe, the fixed cover is fixed to the dam body and is coaxially rotatably connected to the upper end of the drag roller; the rotating chamber is fixed to the drag roller and docked under the fixed cover, and the air pump is connected between the fixed cover and the rotating chamber; one end of the connecting air pipe is fixed and connected to the rotating chamber, and the other end extends to the bottom end of the inner sleeve and is connected to the gap between the inner sleeve and the drag roller.

[0014] Preferably, a control motor is fixed on the dam body, and the output shaft of the control motor is coaxially fixed to the control gate; the power-assisting structure includes a power-assisting gear, a connecting belt and a driving cylinder, the driving cylinder is connected to the drag roller close to one side of the dam body, and the power-assisting gear is rotatably connected to the movable end of the driving cylinder and meshingly connected to the drag roller on one side; the connecting belt is sleeved between the output shaft of the control motor and the rotating shaft of the power-assisting gear.

[0015] Preferably, a synchronization structure is provided between the drag rollers, the synchronization structure comprising a reversing gear and a synchronization belt, the reversing gear is rotationally connected to the dam body and meshingly connected to the rotating shaft of the drag roller on one side; one end of the synchronization belt is sleeved on the rotating shaft of the reversing gear, and the other end is sleeved on the rotating shaft of the drag roller on the opposite side.

[0016] Preferably, the water pumping structure includes a water pumping impeller and a water delivery pipe, the water pumping impeller is fixed to the bottom end of the drag drum; the water delivery pipe is accommodated in the drag drum, the bottom end of the water delivery pipe is sleeved on the water pumping impeller, and the top end extends upward to connect and rotatably connect to the return water channel.

[0017] Preferably, the front and rear ends of the return water channel are respectively connected to the front and rear ends of the dam body, the bottom surface of the return water channel is low near the rear end of the dam body and high near the front end of the dam body, and the rear end width of the return water channel is set corresponding to the rear end opening width of the dam body.

[0018] A dam structure construction method, wherein a control motor drives a control gate to rotate, the dam body is opened, water flows through the dam body opening into the gap between the pressure rollers and shrinks the waterway, the water flows through the pressure rollers at an accelerated speed and drives the pressure rollers to rotate, and the air pump starts to work as the pressure rollers rotate, and the air pump injects air into the water flow through the air holes, so that the water flow contains a large number of bubbles, and when discharged from the dam body, the volume diffusion impact surface of water and air is larger and the pressure is smaller, thereby reducing the impact force of the falling water flow, and increasing the oxygen content of the water body to improve the environment. At the same time, when the pressure roller rotates, the water pump impeller below also rotates, driving the water flow to rise, which can decelerate the pressure roller on the one hand, and recirculate the places where the water flow and air are not fully combined on the other hand to increase the oxygen content of the water body; the water flow of the second cycle flows down in the return channel to form a water curtain, which can reduce the noise of the pressure roller of the dam body, thereby reducing the spread of noise.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. The setting of the flow reduction structure can effectively disperse the energy of the water flow and reduce the force of direct impact on the dam body, thereby slowing down the water flow, reducing the erosion of the riverbed and both banks, and protecting the stability of the surrounding environment; the dam structure, through the comprehensive application of fluid mechanics principles and modern engineering technology, not only strengthens the protection function of the dam itself, but also takes into account environmental protection, effective resource utilization and ecological balance;

[0021] 2. The setting of the discharge drum can effectively capture and disperse the water flow. Its rotation further consumes the energy of the water flow, reduces the force of direct impact on the dam body, and protects the environment from erosion and damage by high-intensity water flow; the smooth and continuous diversion waterway design helps fish and other aquatic organisms to pass safely, reduces the impact on the ecosystem, embodies the concept of ecological water conservancy engineering, and is conducive to maintaining the ecological balance of the river;

[0022] 3. Aeration holes are opened at intervals on the side wall of the drum. The air flows through these holes into the gap between the inner sleeve and the drum, collides and mixes with the water flow to form tiny bubbles, which greatly improves the atomization degree of the water and increases the oxygen content of the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the front end structure of the dam body according to an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the rear end structure of the dam body according to an embodiment of the present application;

[0025] Figure 3 is a schematic diagram showing the interior of a dam body according to an embodiment of the present application;

[0026] Figure 4 is a schematic structural diagram showing the interior of the force release drum according to an embodiment of the present application;

[0027] Figure 5 It is a schematic diagram showing the connected structure of an embodiment of the present application.

[0028] Explanation of the reference numerals in the accompanying drawings: 1. dam body; 2. flow rate reduction structure; 21. force relief roller; 22. diversion water channel; 3. atomization structure; 32. inner sleeve; 33. air hole; 34. drainage channel; 4. air pumping structure; 41. air pump; 42. air intake pipe; 43. air pumping pipe; 5. water pumping structure; 51. water pumping impeller; 52. water delivery pipe; 6. water return channel; 7. control motor; 9. connecting structure; 91. fixed cover; 92. rotating chamber; 93. connecting air pipe; 10. control gate; 11. power-assisting structure; 111. power-assisting gear; 112. connecting belt; 113. driving cylinder; 12. synchronous structure; 121. synchronous belt; 122. reversing gear. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] The present application embodiment discloses a dam structure and a construction method thereof, referring to Figure 1 , 2 , including a dam body 1, with openings at both ends of the dam body 1, and a flow rate reduction structure 2 that is rotatably connected to the dam body 1 and reduces the water flow rate between the openings at both ends of the dam body 1.

[0031] Reference Figure 2 , 3 The flow velocity reduction structure 2 includes a drag roller 21 and a diversion waterway 22. The drag rollers 21 are rotatably connected to the two sides of the dam body 1, and the distance between the drag rollers 21 is smaller than the opening of the dam body 1. The rotating shaft of the drag roller 21 is arranged vertically on the ground, and the upstream fish and shrimp can enter the downstream through the gap between the rollers without being stuck; the diversion waterway 22 is sleeved on the outside of the drag roller 21, and the two ends of the diversion waterway 22 extend outward and smoothly connected to the openings at the two ends of the dam body 1, and the inclined surface of the extended end of the diversion waterway 22 intersects with the corresponding drag roller 21. The water flow at the opening of the dam body 1 rushes to the drag roller 21 as the diversion waterway 22 narrows. The narrowing of the waterway makes the water flow velocity reduction structure 2 faster, and the water flow impacts the drag roller 21, and the roller rotates and reduces the flow velocity of the water flow.

[0032] Reference Figure 3 , 4 The drag drum 21 is provided with an atomizing structure 3 for further reducing the impact force of the water flow. The atomizing structure 3 includes an inner sleeve, an air hole 33 and a drain channel 34. The inner sleeve 32 is vertically accommodated inside the drag drum 21, and a gap is left between the outer wall of the inner sleeve 32 and the side wall of the drag drum 21; the air holes 33 are arranged at intervals on the side wall of the drag drum 21 and are connected to the gap between the drag drum 21 and the inner sleeve 32; one end of the drain channel 34 is fixed and connected to the gap between the drag drum 21 and the inner sleeve 32, and the other end extends through the bottom center of the drag drum 21, and the water entering the gap is discharged from the drag drum 21 through the drain channel 34; when the water flows through the drag drum 21 at a high speed, the pressure of the water body will also be reduced. By injecting gas into the water flow through the air holes 33, the air in the water flow can be increased, and the oxygen content can be increased while creating cavities in the water body.

[0033] Reference Figure 3 , 4 The air hole 33 is supplied with air through the air pumping structure 4. The air pumping structure 4 includes an air pump 41, an air inlet pipe 42 and an air pumping pipe 43. The air pump 41 is fixed to the dam body 1 and meshingly connected to the rotating shaft of the drag roller 21; the air inlet pipe 42 is connected to the air pump 41 and extends upward to penetrate the dam body 1; the air pumping pipe 43 is connected to the air pump 41 and extends downward, and the extending end of the air pumping pipe 43 is provided with a connecting structure 9 rotatably connected to the drag roller 21, and the connecting structure 9 extends downward to be connected to the gap between the drag roller 21 and the inner sleeve.

[0034] Reference Figure 4 , 5The connecting structure 9 includes a fixed cover 91, a rotating chamber 92 and a connecting air pipe 93. The fixed cover 91 is fixed to the dam body 1 and is coaxially rotatably connected to the upper end of the drag roller 21; the rotating chamber 92 is fixed to the drag roller 21 and docked under the fixed cover 91, and the air pump 43 is connected between the fixed cover 91 and the rotating chamber 92; one end of the connecting air pipe 93 is fixed and connected to the rotating chamber 92, and the other end extends to the bottom end of the inner sleeve 32 and is connected to the gap between the inner sleeve 32 and the drag roller 21.

[0035] Reference Figure 4 , 5 A water pumping structure 5 for noise reduction is provided at the bottom of the drag drum 21. The water pumping structure 5 includes a water pumping impeller 51 and a water delivery pipe 52. The water pumping impeller 51 is fixed to the bottom of the drag drum 21; the water delivery pipe 52 is accommodated in the drag drum 21, the bottom end of the water delivery pipe 52 is sleeved on the water pumping impeller 51, and the top end extends upward and is rotatably connected to the dam body 1, and is connected to the outside through the return water channel 6. The drag drum 21 can reduce the kinetic energy of the water pumping impeller 51, thereby increasing the deceleration effect of the drag drum 21 on the water flow.

[0036] Reference Figure 2 , 3 The front and rear ends of the water return channel 6 are respectively connected to the front and rear ends of the dam body 1. The bottom surface of the water return channel 6 is low near the rear end of the dam body 1 and high near the front end of the dam body 1. The rear end width of the water return channel 6 corresponds to the rear end opening width of the dam body 1. The water delivery pipes 52 on both sides are respectively arranged below the water return channel 6 and connected to both sides of the water return channel 6. The drag rollers 21 on both sides rotate synchronously through the synchronous structure 12, so that a uniformly falling water curtain is formed at the water return channel 6.

[0037] Reference Figure 2 , 3 The synchronous structure 12 includes a reversing gear 122 and a synchronous belt 121. The reversing gear 122 is rotatably connected to the dam body 1 and meshedly connected to the rotating shaft of the drag roller 21 on one side; one end of the synchronous belt 121 is sleeved on the rotating shaft of the reversing gear 122, and the other end is sleeved on the rotating shaft of the drag roller 21 on the opposite side; when the water level at the rear end of the dam body 1 is lower than the return water channel 6, the water in the return water channel 6 forms a water curtain and flows down, covering the opening of the dam body 1 to reduce the propagation of noise; when the water level is higher than the return water channel 6, the return water channel 6 can overflow and drain water to reduce the pressure on the dam body 1;.

[0038] Reference Figure 2The front end of the dam body 1 is rotatably connected to a control gate 10, a control motor 7 is fixed on the dam body 1, and the output shaft of the control motor 7 is coaxially fixed to the control gate 10; a power-assisting structure 11 is provided on the control motor 7, and the power-assisting structure 11 includes a power-assisting gear 111, a connecting belt 112 and a driving cylinder 113, and the driving cylinder 113 is connected to the drag roller 21 near one side of the dam body 1, and the power-assisting gear 111 is rotatably connected to the movable end of the driving cylinder 113 and meshingly connected to the drag roller 21 on one side; the connecting belt 112 is sleeved between the output shaft of the control motor 7 and the rotating shaft of the power-assisting gear 111.

[0039] The working process of the present application is: the control motor 7 drives the control gate 10 to rotate, the dam body 1 is opened, the water flows through the opening of the dam body 1 into the space between the drag rollers 21 and contracts the water channel, the water flows through the drag rollers 21 at an accelerated speed and drives the drag rollers 21 to rotate, and the air pump 41 starts to work as the drag roller 21 rotates. The air pump 41 injects air into the water flow through the air holes 33, so that the water flow contains a large number of bubbles. When the water is discharged from the dam body 1, the volume diffusion impact surface of the water and the air is larger and the pressure is smaller, thereby reducing the impact force of the falling water flow and increasing the oxygen content of the water body to improve the environment.

[0040] At the same time, when the drag drum 21 rotates, the water pump impeller 51 below also rotates, driving the water flow to rise. On the one hand, it can slow down the drag drum 21, and on the other hand, it can re-circulate the places where the water flow below is not fully combined with the air to increase the oxygen content of the water body; the water flow of the second cycle flows down in the return channel 6 to form a water curtain, which can reduce the noise of the drag drum 21 of the dam body 1, thereby reducing the spread of noise.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dam structure, comprising a dam body (1), characterized in that: The dam body (1) is provided with openings at both ends, and a flow velocity reduction structure (2) is provided between the openings at both ends of the dam body (1) and is respectively connected to the dam body (1) in a rotational manner. The spacing between the flow velocity reduction structures (2) is smaller than the width of the opening of the dam body (1). The flow velocity reduction structure (2) is provided with an atomization structure (3) which is arranged on the outer wall of the flow velocity reduction structure (2). The flow velocity reduction structure (2) is meshedly connected with an air pumping structure (4). The air pumping structure (4) is fixed to the dam body (1) and is connected to the inner side of the atomization structure (3). A water pumping structure (5) is provided at the bottom end of the flow velocity reduction structure (2). The water pumping structure (5) extends upward and is arranged on the top of the flow velocity reduction structure (2). The dam body (1) extends backward corresponding to the top of the water pumping structure (5) and is connected to a return water channel (6). A control gate (10) is rotatably connected to the front end of the dam body (1). A power assisting structure (11) is meshedly connected between the control gate (10) and the flow velocity reduction structure (2).

2. A dam structure according to claim 1, characterized in that: The flow velocity reduction structure (2) comprises a drag roller (21) and a diversion channel (22), wherein the drag rollers (21) are rotatably connected to the two sides of the dam body (1), and the distance between the drag rollers (21) is smaller than the opening of the dam body (1), and the rotation axis of the drag roller (21) is arranged vertically to the ground; the diversion channel (22) is sleeved on the outside of the drag roller (21), and the two ends of the diversion channel (22) extend outwards and smoothly connect to the openings at the two ends of the dam body (1), and the inclined surface of the extended end of the diversion channel (22) intersects with the corresponding drag roller (21).

3. A dam structure according to claim 2, characterized in that: The atomization structure (3) comprises an inner sleeve, an air-injection hole (33) and a drainage channel (34); the inner sleeve (32) is vertically accommodated inside the drag roller (21), and a gap is left between the outer wall of the inner sleeve (32) and the side wall of the drag roller (21); the air-injection hole (33) is arranged at intervals on the side wall of the drag roller (21) and is connected to the gap between the drag roller (21) and the inner sleeve (32); one end of the drainage channel (34) is fixed and connected to the gap between the drag roller (21) and the inner sleeve (32), and the other end extends and passes through the bottom center of the drag roller (21).

4. A dam structure according to claim 3, characterized in that: The air pumping structure (4) comprises an air pump (41), an air inlet pipe (42) and an air pumping pipe (43); the air pump (41) is fixed to the dam body (1) and meshedly connected to the rotating shaft of the drag roller (21); the air inlet pipe (42) is connected to the air pump (41) and extends upward to pass through the dam body (1); the air pumping pipe (43) is connected to the air pump (41) and extends downward, and the extended end of the air pumping pipe (43) is provided with a connecting structure (9) rotatably connected to the drag roller (21); the connecting structure (9) extends downward to connect to the gap between the drag roller (21) and the inner sleeve.

5. A dam structure according to claim 4, characterized in that: The connecting structure (9) comprises a fixed cover (91), a rotating chamber (92) and a connecting air pipe (93); the fixed cover (91) is fixed to the dam body (1) and is coaxially rotatably connected to the upper end of the drag roller (21); the rotating chamber (92) is fixed to the drag roller (21) and butt-jointed to the bottom of the fixed cover (91); the air pumping pipe (43) is connected between the fixed cover (91) and the rotating chamber (92); one end of the connecting air pipe (93) is fixed and connected to the rotating chamber (92), and the other end extends to the bottom end of the inner sleeve (32) and is connected to the gap between the inner sleeve (32) and the drag roller (21).

6. A dam structure according to claim 2, characterized in that: A control motor (7) is fixed on the dam body (1), and the output shaft of the control motor (7) is coaxially fixed to the control gate (10); the power-assisting structure (11) comprises a power-assisting gear (111), a connecting belt (112) and a driving cylinder (113); the driving cylinder (113) is connected to a drag roller (21) on one side of the dam body (1); the power-assisting gear (111) is rotationally connected to the movable end of the driving cylinder (113) and meshingly connected to the drag roller (21) on one side; the connecting belt (112) is sleeved between the output shaft of the control motor (7) and the rotating shaft of the power-assisting gear (111).

7. A dam structure according to claim 2, characterized in that: A synchronous structure (12) is provided between the drag rollers (21), and the synchronous structure (12) comprises a reversing gear (122) and a synchronous belt (121). The reversing gear (122) is rotatably connected to the dam body (1) and meshingly connected to the rotating shaft of the drag roller (21) on one side; one end of the synchronous belt (121) is sleeved on the rotating shaft of the reversing gear (122), and the other end is sleeved on the rotating shaft of the drag roller (21) on the opposite side.

8. A dam structure according to claim 2, characterized in that: The water pumping structure (5) comprises a water pumping impeller (51) and a water delivery pipe (52), wherein the water pumping impeller (51) is fixed to the bottom end of the drag roller (21); the water delivery pipe (52) is accommodated in the drag roller (21), the bottom end of the water delivery pipe (52) is sleeved on the water pumping impeller (51), and the top end of the water delivery pipe (52) extends upward to communicate with and rotatably connect to the water return channel (6).

9. A dam structure according to claim 8, characterized in that: The front and rear ends of the water return channel (6) are respectively connected to the front and rear ends of the dam body (1); the bottom surface of the water return channel (6) is lower on the side close to the rear end of the dam body (1) and higher on the side close to the front end of the dam body (1); the rear end width of the water return channel (6) is set corresponding to the rear end opening width of the dam body (1).

10. A dam structure construction method according to any one of claims 1 to 9, characterized in that: The control motor (7) drives the control gate (10) to rotate, the dam body (1) opens, the water flows through the opening of the dam body (1) into the space between the drag rollers (21) and contracts the water channel, the water flows through the drag rollers (21) at an accelerated speed and drives the drag rollers (21) to rotate, and the air pump (41) starts to work as the drag rollers (21) rotate, and the air pump (41) injects air into the water flow through the air holes (33), so that a large number of bubbles are contained in the water flow. When the water flows out of the dam body (1), the volume diffusion impact surface of the water and the air is larger and the pressure is smaller, thereby reducing the impact force of the falling water flow and increasing the oxygen content of the water body to improve the environment. At the same time as the drag drum (21) rotates, the water pump impeller (51) below also rotates, driving the water flow upward. On the one hand, the drag drum (21) can be decelerated, and on the other hand, the water flow below that is not fully combined with the air can be recirculated to increase the oxygen content of the water body; the water flow of the second cycle flows down in the return channel (6) to form a water curtain, which can reduce the noise of the drag drum (21) of the dam body (1), thereby reducing the spread of noise.

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