Overlapped combined water inlet tower for hydropower station

Abstract

The invention belongs to the technical field of water conservancy and hydropower engineering construction, and discloses an overlapped type combined water intake tower for a hydropower station, which is suitable for arrangement of water intake ports on rivers with high sediment content and comprises a water diversion and power generation tunnel water intake port and a flood discharge and sand flushing tunnel water intake port which are arranged in an overlapped manner, and the water diversion and power generation tunnel water intake port is positioned right above the flood discharge and sand flushing tunnel water intake port; the flood discharge and sand flushing hole water intake extends forwards to form a forward extending type water inlet; the water diversion and power generation hole extends towards the mountain on the plane, and the flood discharge and sand flushing hole extends along a straight line; according to the scheme, the water diversion and power generation hole water intakes and the flood discharge and sand flushing hole water intakes are of a water inlet tower combined structure which is overlapped up and down and arranged in a centralized mode, and the water flow flushing effect of the lower flood discharge and sand flushing hole is utilized to form a direct sand pulling and removing effect on an inlet area of the upper water diversion and power generation hole; deposited silt near an inlet of the water diversion power generation hole can be taken away through water flow power of the flood discharge and sand flushing hole; the problem that the inlet of the water diversion power generation hole is blocked due to sediment deposition in the sediment-laden river is solved.

Description

TECHNICAL FIELD

[0001] The present scheme belongs to the technical field of water conservancy and hydropower engineering construction innovation, and particularly relates to an overlapping combined water intake tower for hydropower stations. BACKGROUND

[0002] The Tuorleka Hydropower Station is located in the middle reaches of the Kizil River in Wuheshaluxiang, Wuqia County, Kizilsu Kirghiz Autonomous Prefecture, Xinjiang, and is the second cascade in the Kizil River planning "2 reservoirs and 6 levels" development plan. The dam site is located 640m upstream of the Wuheshaluxiang Bridge, 58km from Wuqia County and 150km from Kashi. The control catchment area above the dam site is 10381km², with an average annual sediment concentration of 6.2kg / m³. The project has the characteristics of high altitude, high earthquake intensity, high sediment, and deep overburden.

[0003] In the construction of hydropower stations in sediment-laden rivers, sediment deposition in power generation and water diversion structures and control of sediment concentration through the machine are difficult problems in engineering design. On the one hand, the intake should be kept clear to avoid sediment deposition, and on the other hand, the sediment concentration through the machine should be reduced to reduce the erosion of the machine by the sediment. Traditional intake towers are arranged in a variety of ways, such as front intake and side sediment discharge, side intake and front sediment discharge, or front intake and front sediment discharge. However, in high-sediment water areas with high sediment hardness and complex particle size distribution, these arrangements cannot effectively solve the above problems, which can lead to blockage of the intake of the water diversion and power generation tunnel, or an excessive proportion of coarse particles in the sediment passing through the machine, which can exacerbate the erosion of the water turbine generator set and affect the safe and stable operation of the project and economic benefits.

[0004] For the special working conditions of sediment-laden rivers, there is a lack of solutions in existing technology that take into account both sediment control effectiveness and structure, especially in complex environments like the Tuorleka Hydropower Station, where traditional structures cannot meet the needs of "door clear" and machine protection. SUMMARY

[0005] The purpose of the present scheme is to provide an overlapping combined water intake tower for hydropower stations to solve the problem of sediment deposition and blockage of the intake of the water diversion and power generation tunnel in a sediment-laden river.

[0006] In order to achieve the above purpose, the present scheme provides an overlapping combined water intake tower for hydropower stations, which includes a combined water intake tower. The water intake tower is provided with a water intake for a water diversion and power generation tunnel and a water intake for a flood discharge and sediment flushing tunnel. The water intake for the water diversion and power generation tunnel is located above the water intake for the flood discharge and sediment flushing tunnel. The water intake for the flood discharge and sediment flushing tunnel has a forwardly extending intake forming a forwardly extending water intake.

[0007] The principle and effect of the scheme are that: (1) the water intake of the water diversion power generation tunnel and the water intake of the flood discharge and sand flushing tunnel are arranged in a combined intake tower structure vertically overlapped and concentrated, the water flow of the lower flood discharge and sand flushing tunnel is used to directly remove the silt in the intake area of the upper water diversion power generation tunnel, the water flow power of the flood discharge and sand flushing tunnel is used to form a funnel-shaped water flow vortex to carry away the silt near the intake of the water diversion power generation tunnel, and the silt is prevented from accumulating at the intake, so that the intake of the water diversion power generation tunnel is kept clean, and the problem of easy silt accumulation and blockage at the intake of the water diversion power generation tunnel in a river with much silt is solved.

[0008] Further, the intake tower is arranged at the outlet of the gully in front of the dam; the water intake of the water diversion power generation tunnel is used for water diversion and power generation, and the water intake of the flood discharge and sand flushing tunnel is used for flood discharge and sand flushing, and the water intakes of the two tunnels are arranged vertically overlapped in plan.

[0009] The principle and effect of the scheme are that: the intake tower is arranged at the outlet of the gully in front of the dam, and the water intakes of the water diversion power generation tunnel and the flood discharge and sand flushing tunnel are arranged vertically overlapped in plan, and the water flow power of the flood discharge and sand flushing tunnel is enhanced by the concentrated water flow at the gully.

[0010] Further, the water intake of the water diversion power generation tunnel is extended to the mountain in plan, and the water intake of the flood discharge and sand flushing tunnel is extended along a straight line, so that a sand flushing funnel is formed at the front end of the water intake of the flood discharge and sand flushing tunnel.

[0011] The principle and effect of the scheme are that: the water intake of the water diversion power generation tunnel is extended to the mountain in plan to adapt to the hub arrangement and guide the water flow into the power station building, the water intake of the flood discharge and sand flushing tunnel is extended along a straight line to reduce the water flow resistance, a sand flushing funnel is formed at the front end of the water intake of the flood discharge and sand flushing tunnel by the straight flow channel to enhance the water flow power, and the silt in the intake area of the water intake of the water diversion power generation tunnel is flushed, so that the silt accumulation and blockage are further avoided.

[0012] Further, a trash rack is arranged at the front end of the front-stretching intake.

[0013] The principle and effect of the scheme are that: the trash rack is used to intercept the floating objects such as branches and stones in the water flow to prevent the floating objects from entering the flow channel to block the intake or damage the equipment.

[0014] Further, the cleaning device is arranged at the front end of the sewage screen of the water intake tower, and comprises a driving sprocket and a driven sprocket.

[0015] The principle and effect of the scheme are that when the cleaning device works, the driving assembly drives the driving sprocket to rotate, the driving sprocket drives the plurality of driven sprockets to rotate synchronously through the chain, and the chain moves along the track formed by the driving sprocket and the driven sprocket. With the continuous movement of the chain, the salvage plate carrying the sundries continues to move towards the driving sprocket, when it moves to the driving sprocket, the chain changes direction along with the circumferential movement of the driving sprocket, the salvage plate inclines due to the change of its own angle, and the sundries carried on the salvage plate fall into the collecting groove on the side of the driving sprocket under the action of gravity, thereby completing the process of intercepting and collecting the sundries in the water.

[0016] Further, the chain plate of the chain is provided with a filter plate, the number of the filter plate is several, and the filter plate is a strip-shaped filter plate arranged along the movement track of the chain.

[0017] The principle and effect of the scheme are that the strip-shaped filter plate on the chain moves with the chain, and intercepts the branches and floating objects in the water flow area at the front end of the sewage screen.

[0018] Further, the driving assembly comprises a motor, a driving rod and a rocker, the output shaft of the motor is fixedly connected with one end of the driving rod in a same axis, the free end of the driving rod is hingedly connected with the disc surface of the driving sprocket, the driving sprocket is coaxially provided with a supporting disc, the supporting disc is fixedly arranged at the top of the water intake tower through a connecting rod, the rocker is eccentrically hingedly connected with the supporting disc, the free end of the rocker is provided with a supporting frame, the rocker is slidably connected with the supporting frame, and the first eccentric hinged end of the driving rod and the driving sprocket is arranged in the supporting frame.

[0019] The principle and effect of the scheme are that when the motor drives the driving rod to rotate, the first eccentric hinged end of the driving rod moves in the support frame, the support frame is slidingly connected with the rocker, and the rocker is eccentrically hinged with the fixed support disc. When the driving rod rotates, it drives the rocker to swing around the hinged point of the support disc through the support frame, and in turn drives the driving sprocket to rotate. Since there is an eccentric distance between the hinged point of the rocker and the support disc, and the hinged points of the driving rod and the driving sprocket, the hinged point of the rocker and the support disc and the movement trajectories of the two form an eccentric transmission relationship, so that the driving sprocket has different angular velocities when rotating back and forth during the rotation of the driving rod: in the working stroke of driving debris, the driving sprocket has a movement trajectory with a relatively fast speed and a movement trajectory with a relatively slow speed. At the same time, the movement trajectory with a relatively fast speed corresponds to the reversing area, that is, the fishing plate is turned to the driving sprocket when moving along the chain, the driving sprocket rotates at a relatively fast speed, at this time, the change rate of the tangential velocity of the fishing plate is large, the centrifugal force and the inertial force of the debris are enhanced, so as to overcome the adhesion force of the debris (such as branches with mud and wet grass) with the fishing plate, obtain a large throwing force, and make the debris be thrown into the collecting groove; while in the movement trajectory (non-reversing working stroke), the driving sprocket rotates at a relatively slow speed, which can reduce the water flow resistance of the fishing plate in the water body, avoiding the situation that the debris falls prematurely due to simply increasing the speed.

[0020] Further, the cleaning assembly is further provided, which comprises a cleaning roller and a water pump, the cleaning roller is coaxially fixedly connected with the driving sprocket, the cleaning roller is provided with a water storage chamber, a plurality of water spraying holes are arranged on the roller surface of the cleaning roller in a circumferential direction, and the water spraying holes are in communication with the water storage chamber; the water inlet end of the water pump is arranged in the water body through a pipeline, the water outlet end of the water pump is connected with a rotary joint through a pipeline, and the other end of the rotary joint is in communication with the water storage chamber.

[0021] The principle and effect of the scheme are that the water pump pumps water from the water body, the water is transported to the water storage chamber in the cleaning roller through the pipeline and the rotary joint, the water in the water storage chamber is sprayed out through the water spraying holes arranged in the circumferential direction of the roller surface through the synchronous rotation of the cleaning roller and the driving sprocket, and a reverse flushing water flow is formed. Since the cleaning roller rotates coaxially with the driving sprocket, the rotation trajectory of the cleaning roller matches the movement trajectory of the filter plate, and the water flow sprayed out of the water spraying hole can act on the back of the filter plate and the pores, so as to generate an impact force on the fine particle mud and the large impurities (such as branches with mud and wet grass) stuck between the filter plates, and clean them from the filter plate.

[0022] Further, the water spraying hole is arranged on the upper half of the cleaning roller, the water spraying hole is provided with a sealing ball for sealing the water spraying hole, the sealing ball is connected with a spring, and the free end of the spring is fixedly connected with the water storage chamber.

[0023] Further, the water spraying hole is of an expanded structure, and the diameter of the sealing ball is greater than the inner diameter of the outlet end of the water spraying hole.

[0024] The principle and effect of the scheme are that the sealing ball can drive the sealing water spraying hole in the natural state of the spring. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural diagram of the water inlet tower of the present application Figure 1 ; Figure 2 is an upstream plan view of the water inlet tower of the present application Figure 3 is an upstream vertical view of the water inlet tower of the present application Figure 4 is a structural diagram of the water inlet tower of the present application Figure 2 ; Figure 5 is a partial enlarged diagram of A in the present application Figure 4 ; Figure 6 is a structural diagram of the driving assembly of the present application Figure 7 is a structural diagram of the motion trajectory of the driving sprocket of the present application Figure 8 is a structural diagram of the cleaning assembly of the present application

[0026] The reference signs in the drawings of the specification include: water inlet tower 1, front-stretching water inlet 11, water inlet of water diversion and power generation hole 12, water inlet of flood discharge and sand flushing hole 13, sand flushing funnel 14, trash rack 15, cleaning device 2, driving sprocket 21, driven sprocket 22, support rod 23, chain 24, fishing plate 25, collection groove 26, filter plate 27, driving assembly 3, motor 31, driving rod 32, first eccentric hinged end 321, rocker 33, support disc 34, second eccentric hinged end 341, support frame 35, cleaning assembly 4, cleaning roller 41, water storage chamber 411, water spraying hole 412, sealing ball 42, spring 43. DETAILED DESCRIPTION

[0027] The concept and the generated technical effects of the present application will be described clearly and completely in the following combined with the embodiments, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments, and other embodiments obtained by the person skilled in the art without creative labor based on the embodiments of the present application, all belong to the protection scope of the present application: Embodiment 1: Please refer to Figures 1-3The overlapping combined water intake tower of the embodiment includes an integrally cast intake tower 1, which is cast using anti-permeable concrete and has a whole rectangular columnar structure. The intake tower 1 is provided with three functionally independent water intake openings along its height direction, namely two water intake openings 12 for water diversion and power generation tunnels and one water intake opening 13 for a flood discharge and sand flushing tunnel. The water intake openings 12 for the water diversion and power generation tunnels are located directly above the water intake opening 13 for the flood discharge and sand flushing tunnel and are arranged in overlapping manner in plan view, forming a centralized layout of “upper water intake for power generation and lower water intake for flood discharge and sand flushing”. The function spaces of the two water intake openings can be compactly integrated, the scour blind area caused by the traditional decentralized layout can be avoided, and the water flow of the lower water intake opening 13 for the flood discharge and sand flushing tunnel can directly cover the inlet area of the upper water intake opening 12 for the water diversion and power generation tunnels, thereby providing a structural basis for sand removal. Meanwhile, the flood discharge tunnel gate well is gradually changed and merged, and then the power generation tunnel maintenance gate well is arranged opposite to the flood discharge tunnel gate well. The two gate wells are smoothly connected with the two tunnels by using open tunnels.

[0028] Please continue to refer to Figures 1-3 The inlet end of the water intake opening 13 for the flood discharge and sand flushing tunnel is cantilevered forward to form a forward-stretching water intake opening 11, which is integrally cast with the water intake opening 13 for the flood discharge and sand flushing tunnel. The extension length of the forward-stretching water intake opening 11 is determined according to the width of the main stream of the river (3 m in the embodiment), and the inlet end surface of the forward-stretching water intake opening 11 is perpendicular to the direction of the main stream of the river, so as to reduce the flow resistance of the water flow. Through the forward-stretching design, the water intake opening 13 for the flood discharge and sand flushing tunnel can directly access the lower water flow with high sediment content in the river (the sediment content of the lower water flow in the river is usually 30%-50% higher than that of the upper water flow), thereby enhancing the water flow power and providing sufficient sediment-containing water flow source for the subsequent formation of the sand flushing funnel 14, so as to avoid the sediment deposition below the inlet of the water intake opening 12 for the water diversion and power generation tunnels.

[0029] Please continue to refer to Figures 1-3 The intake tower 1 is arranged at the outlet of the gully, which is the intersection area of the gully water flow and the main stream of the river. The water flow has high speed and strong water flow power compared with other areas of the river (the flow speed is usually 0.8-1.2 m / s). The intake tower 1 is arranged at this position, on the one hand, the water intake flow and speed of the water intake opening 13 for the flood discharge and sand flushing tunnel can be improved by the concentrated water flow at the gully, so that the water flow speed in the water intake opening 13 for the flood discharge and sand flushing tunnel can be maintained at 2.2-2.5 m / s, thereby strengthening the flood discharge and sand flushing effect; on the other hand, the terrain at the outlet of the gully is relatively flat, the excavation depth can be reduced by 2-3 m, the disturbance to the surrounding mountains is reduced, and the geological conditions of deep overburden layer (the thickness of the overburden layer is about 15 m) are adapted. In addition, the water intake opening 12 for the water diversion and power generation tunnels is connected with the power generation tunnel excavated in the mountain through a gradual change section (the gradual change length is 4 times the cross-sectional diameter of the tunnel), so as to realize the water intake and power generation functions.

[0030] Please continue to refer to Figures 1-3, the water intake 12 of the diversion power generation tunnel extends to one side of the mountain body in a horizontal plane, and the turning angle is 45°, which is determined according to the relative position of the power station and the mountain body, to ensure that the extension section of the water intake 12 of the diversion power generation tunnel can be smoothly connected with the entrance of the power generation tunnel in the mountain body. The water intake 13 of the flood discharge and sand flushing tunnel extends in a straight line, so that the water flow forms a reverse conical sand flushing funnel 14 at the front end area of the water intake 13 of the flood discharge and sand flushing tunnel, which covers the area directly below and the surrounding area of 1.5 m of the entrance of the water intake 12 of the diversion power generation tunnel. The water flow in the sand flushing funnel 14 forms a strong vortex suction, which can suck the sediment (including coarse-grained sediment with a particle size of ≤5 mm) deposited near the entrance of the water intake 12 of the diversion power generation tunnel into the water intake 13 of the flood discharge and sand flushing tunnel, and then discharge it with the water flow, to avoid the accumulation of sediment at the entrance of the water intake 12 of the diversion power generation tunnel. A trash rack 15 is arranged at the front end face of the protruding type water inlet 11, which is composed of a plurality of parallel arranged bars, and the bars intercept branches, stones, waterweeds and other floating objects, and cooperate with the sand flushing funnel 14 to realize the "clean in front of the door" of the entrance of the water intake 12 of the diversion power generation tunnel.

[0031] Embodiment 2 The difference between this embodiment and the previous embodiment is that although the water intake tower is provided with a sewage rack, in a river with a large amount of sediment, although the sewage rack arranged on the water intake tower can intercept floating objects in the water flow to avoid them directly entering the entrance flow passage of the power generation diversion tunnel, due to the environmental characteristics of the river, there may be a large amount of debris with different volumes in the water flow, especially in the flood season, the debris quickly flows into the water flow with high sediment content, if only relying on the sewage rack to intercept, it is easy to cause the debris to quickly accumulate in front of the rack, reduce the water flow speed in front of the rack, and then cause the sediment to deposit around the debris. Therefore, this embodiment is used to arrange a water debris salvaging device at the front end of the sewage rack, to pre-intercept and clean the debris in the water flow.

[0032] Please refer to Figure 4 and Figure 5 , the cleaning device 2 includes a driving sprocket 21 and a driven sprocket 22, the driving sprocket 21 is arranged at the top of the water intake tower 1, and the driving sprocket 21 is connected with a driving assembly 3 for driving the rotation thereof; the number of the driven sprockets 22 is two, one of which is located above the sewage rack 11, and both driven sprockets 22 are connected with a support rod 23 for supporting the driven sprocket 22, and are rotatably connected with one end of the support rod 23, and the free end of the support rod 23 is fixedly connected with the tower body of the water intake tower 1; the driving sprocket 21 and the plurality of driven sprockets 22 are drivingly connected through a chain 24, a plurality of fishing plates 25 are arranged on the chain plate of the chain 24, one side of the driving sprocket 21 is provided with a collecting groove 26, and a filter plate 27 is arranged on the chain plate of the chain 24, the number of the filter plates 27 is a plurality of, and the filter plates 27 are strip-shaped filter plates 27 arranged along the movement direction of the chain 24.

[0033] When the cleaning device 2 works, the driving assembly 3 drives the driving sprocket 21 to rotate, the driving sprocket 21 drives the plurality of driven sprockets 22 to rotate synchronously through the chain 24, and the chain 24 moves circularly along the track formed by the driving sprocket 21 and the driven sprockets 22. The strip filter plate 27 on the chain 24 moves with the chain 24, and intercepts branches, floating objects and the like in the water flow area at the front end of the trash rack 11. As the chain 24 continues to move, the sundries intercepted on the filter plate 27 fall into the fishing plate 25 arranged at intervals on the chain link plate under the action of gravity or slight vibration in the movement. The fishing plate 25 carrying sundries continues to move towards the driving sprocket 21, when it moves to the driving sprocket 21, the chain 24 changes direction with the circumferential movement of the driving sprocket 21, the fishing plate 25 tilts due to the change of its own angle, and the sundries carried thereon fall off the fishing plate 25 under the action of gravity and fall into the collecting groove 26 on the side of the driving sprocket 21, completing the process of intercepting and collecting sundries in the water body.

[0034] In the above scheme, since the driving sprocket 21 rotates at a constant speed, when the fishing plate 25 changes direction as it moves to the driving sprocket 21, the tangential direction of the trajectory of the fishing plate 25 changes at a stable rate, and the resultant force of the centrifugal force and the gravity component force acting on the sundries is small. For sundries with large weight and strong adhesion (such as branches with mud and wet grass), it is difficult for them to completely separate from the fishing plate 25 only by inertia and gravity at the time of turning, resulting in insufficient throwing force and failing to throw into the collecting groove 26, and falling into the water again. However, if the speed of the driving sprocket 21 is increased to enhance the throwing force, the overall movement speed of the chain 24 and the fishing plate 25 will be increased, and since most of the chain 24 is in the water body, if the speed is too fast, the fishing plate 25 will be subjected to greater water flow resistance and impact force when moving in the water body, which will act on the sundries on the fishing plate 25, causing the sundries to generate a large inertial force, resulting in the sundries easily separating from the fishing plate 25 under the action of inertia and falling into the water again. Therefore, the driving assembly 3 needs to be optimized and improved.

[0035] Please refer to Figure 5 , the driving assembly 3 includes a motor 31, a driving rod 32 and a rocker 33, the output shaft of the motor 31 is coaxially fixedly connected with one end of the driving rod 32, the free end of the driving rod 32 is hingedly connected with the disc surface of the driving sprocket 21, the driving sprocket 21 is coaxially provided with a support disc 34, the support disc 34 is fixedly arranged at the top of the water inlet tower 1 through a connecting rod (i.e. the support disc 34 is fixed and cannot move), the rocker 33 is eccentrically hingedly connected with the support disc 34, the free end of the rocker 33 is provided with a support frame 35, the rocker 33 is slidingly connected with the support frame 35, and the first eccentric hinged end 321 of the driving rod 32 and the driving sprocket 21 is arranged in the support frame 35.

[0036] Please refer to Figure 6When the motor 31 drives the driving rod 32 to rotate, the first eccentric hinged end 321 of the driving rod 32 moves in the support frame 35, the support frame 35 is in sliding connection with the rocker 33, and the rocker 33 is in eccentric hinged connection with the fixed support disc 34. When the driving rod 32 rotates, it drives the rocker 33 to swing around the hinged point of the support disc 34 through the support frame 35, and in turn drives the driving sprocket 21 to rotate. Since the hinged point of the rocker 33 and the support disc 34 has an eccentric distance, and the hinged points of the driving rod 32 and the driving sprocket 21, the hinged point of the rocker 33 and the support disc 34 and the movement trajectories of the two form an eccentric transmission relationship, so that the driving sprocket 21 has different angular velocities when rotating back and forth in the process of rotating with the driving rod 32: in the working stroke of driving the sundries to be salvaged, the driving sprocket 21 has a movement trajectory (A1) with a relatively fast speed and a movement trajectory (A2) with a relatively slow speed. At the same time, the movement trajectory (A1) with the relatively fast speed corresponds to a reversing area, that is, the salvaging plate 25 is reversed when moving to the driving sprocket 21, the driving sprocket 21 has a relatively fast speed, at this time, the change rate of the tangential velocity of the salvaging plate 25 is large, the centrifugal force and the inertial force of the sundries are enhanced, so as to overcome the adhesion force of the sundries (such as branches with mud, wet grass) with the salvaging plate 25, obtain a large throwing force, and make the sundries be thrown into the collecting groove 26; and in the movement trajectory A2 (non-reversing working stroke), the driving sprocket 21 has a relatively slow speed, which can reduce the water flow resistance of the sundries when the salvaging plate moves in the water body, and avoid the situation that the sundries are prematurely dropped due to simply increasing the speed.

[0037] In a river with a large amount of sand, the sundries such as sand, branches and water grass carried by the water flow are intercepted by the filter plate, and the sand content in the flood season is as high as 7.4 kg / m³. Part of the fine particle sand may be attached to the pores of the filter plate 27, and larger sundries (such as branches with mud and wet grass) may be stuck between the filter plates 27, causing the filter plates 27 to be gradually blocked. After the filter plates 27 are blocked, the flow area is reduced, the water flow passing efficiency is reduced, and the water flow speed in front of the grid is reduced. Therefore, the filter plates 27 need to be backwashed, and the sewage grid 11 is used to make the water intake hole entrance “clear”.

[0038] Please refer to Figure 7 The cleaning assembly 4 comprises a cleaning roller 41 and a water pump (not shown in the figure), the cleaning roller 41 is fixedly connected with the driving sprocket 21 in a coaxial manner, a water storage chamber 411 is formed in the cleaning roller 41, a plurality of water spraying holes 412 are formed in the roller surface of the cleaning roller 41 in a circumferential direction, and the water spraying holes 412 are in communication with the water storage chamber 411; the water inlet end of the water pump is arranged in the water body through a pipeline, the water outlet end of the water pump is connected with a rotary joint through a pipeline, and the other end of the rotary joint is in communication with the water storage chamber 411.

[0039] When working, water is pumped from the water body by the water pump, and is transported to the water storage chamber 412 in the cleaning roller 41 through the pipeline and the rotating joint. The water in the water storage chamber 411 is sprayed out through the water spraying holes 412 arranged in the circumferential direction of the roller surface by the synchronous rotation of the cleaning roller 41 with the driving sprocket 21, so as to form a reverse flushing water flow. Since the cleaning roller 41 rotates coaxially with the driving sprocket 21, the rotating track of the cleaning roller 41 matches the movement track of the filter plate 27, and the water flow sprayed out of the water spraying hole 412 can act on the back of the filter plate 27 and the pores, so as to generate an impact force on the fine particle silt and the larger impurities (such as branches with silt and wet grass) stuck between the filter plates 27, and clean them from the filter plates 27.

[0040] During the rotation of the driving sprocket 21, only the region (A1 region) in contact with the chain 24 corresponds to the working position of the filter plate 27, and the remaining region (A2 region) has no actual flushing effect on water spraying, but will cause water source waste, so it is further optimized.

[0041] Please refer to Figure 8 , the water spraying hole 412 is arranged in the upper half of the cleaning roller 41, the water spraying hole 412 has an expanding structure, that is, the expanding structure with a small water inlet end and a large water outlet end, the water spraying hole 412 is provided with a sealing ball 42, the diameter of the sealing ball 42 is greater than the inner diameter of the water outlet end of the water spraying hole, and the sealing ball 42 is preferably a sealing ball 42 made of rubber material, the sealing ball 42 is connected with a spring 43, and the free end of the spring 43 is fixedly connected with the water storage chamber 411. The second eccentric hinge end 341 of the support disc 34 and the rocker 33 and the axis of the driving sprocket 21 form a first eccentric distance, the first eccentric distance is 0.8 times the radius of the driving sprocket 21, and the length of the driving rod 32 is 0.15 times the length of the rocker 33, so that the driving sprocket 21 generates an angular velocity change in the circumferential direction, and the average angular velocity of 3 / 4 period (A1 region) is greater than that of 1 / 4 period (A2 region).

[0042] When working, since the average angular velocity of the driving sprocket 21 in the A1 region of 3 / 4 period is large, the cleaning roller 41 fixed coaxially with the driving sprocket 21 rotates at high speed, the sealing ball 42 in the water storage chamber 411 moves to the water outlet end of the water spraying hole 412 under the action of large centrifugal force, stretches the spring 43, and opens the water spraying hole 412; at the same time, the water delivered by the water pump is sprayed out through the water storage chamber 411 and the water spraying hole 412, and acts on the filter plate passing through the A1 region, so as to realize reverse flushing. In the A2 region of 1 / 4 period, the average angular velocity of the driving sprocket 21 is small, the centrifugal force generated by the rotation of the cleaning roller 41 is weakened, the spring 43 pushes the sealing ball 42 to reset, and the water spraying hole 412 is closed, so that the water flow cannot be sprayed out, thereby avoiding waste of water source in the non-working region.

[0043] The above-mentioned are only embodiments of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described too much. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A superimposed combined intake tower for a hydropower station, comprising a combined intake tower (1), characterized in that: The water intake tower (1) is provided with a water intake (12) for the water diversion and power generation tunnel and a water intake (13) for the flood discharge and sand flushing tunnel. The water intake (12) for the water diversion and power generation tunnel is located above the water intake (13) for the flood discharge and sand flushing tunnel. The inlet of the water intake (13) for the flood discharge and sand flushing tunnel extends forward to form a forward-extending water intake (11).

2. The overlapping combined intake tower for a hydropower station according to claim 1, characterized in that: The water intake tower (1) is located at the outlet of the gully in front of the dam; the water intake (12) of the water diversion and power generation tunnel is used for water intake and power generation, and the water intake (13) of the flood discharge and sand flushing tunnel is used for flood discharge and sand flushing. The water intake (12) of the water diversion and power generation tunnel and the water intake (13) of the flood discharge and sand flushing tunnel are arranged to overlap on the plane projection.

3. The overlapping combined intake tower for a hydropower station according to claim 1, characterized in that: The water intake (12) of the water diversion and power generation tunnel extends towards the mountain in the plane, and the water intake (13) of the flood discharge and sand flushing tunnel extends in a straight line, so that the front end of the water intake (13) of the flood discharge and sand flushing tunnel forms a sand flushing funnel (14).

4. The overlapping combined intake tower for a hydropower station according to claim 3, characterized in that: The front end of the forward-extending water inlet (11) is provided with a trash rack (15).

5. The overlapping combined intake tower for a hydropower station according to claim 4, characterized in that: It also includes a cleaning device (2) located at the front end of the drain grate (15) of the water intake tower (1). The cleaning device (2) includes a drive sprocket (21) and a driven sprocket (22). The drive sprocket (21) is located at the top of the water intake tower (1) and is connected to a drive assembly (3) for driving its rotation. There are multiple driven sprockets (22), one of which is located above the drain grate (15). The driven sprocket (22) is connected to a support rod (23), and the free end of the support rod (23) is fixedly connected to the tower body of the water intake tower (1). The drive sprocket (21) and multiple driven sprockets (22) are connected by a chain (24). The chain (24) is provided with several spaced-apart retrieval plates (25), and a collection trough (26) is provided on one side of the drive sprocket (21).

6. The overlapping combined intake tower for a hydropower station according to claim 5, characterized in that: The chain (24) has filter plates (27) on its chain plates. The number of filter plates (27) is several, and the filter plates (27) are strip-shaped filter plates (27) and are set along the movement trajectory of the chain (24).

7. The overlapping combined intake tower for a hydropower station according to claim 6, characterized in that: The drive assembly (3) includes a motor (31), a drive rod (32), and a rocker arm (33). The output shaft of the motor (31) is coaxially fixedly connected to one end of the drive rod (32). The free end of the drive rod (32) is hinged to the disc surface of the drive sprocket (21). The drive sprocket (21) is coaxially connected to a support disc (34). The support disc (34) is fixedly mounted on the top of the water inlet tower (1) by a connecting rod. The rocker arm (33) is eccentrically hinged to the support disc (34). The free end of the rocker arm (33) is connected to a support frame (35). The rocker arm (33) is slidably connected to the support frame (35). The first eccentric hinge end (321) of the drive rod (32) and the drive sprocket (21) is located inside the support frame (35).

8. The overlapping combined intake tower for a hydropower station according to claim 7, characterized in that: It also includes a cleaning assembly (4), which includes a cleaning roller (41) and a water pump. The cleaning roller (41) is coaxially and fixedly connected to the drive sprocket (21). A water storage chamber (411) is provided inside the cleaning roller (41). Several circumferentially arranged water spray holes (412) are provided on the roller surface of the cleaning roller (41). The water spray holes (412) are connected to the water storage chamber (411). The water inlet of the water pump is located in the water body through a pipe. The water outlet of the water pump is connected to a rotary joint through a pipe. The other end of the rotary joint is connected to the water storage chamber (411).

9. A superimposed combined intake tower for a hydropower station according to claim 7, characterized in that: The water spray hole (412) is located on the upper half of the cleaning roller (41). A sealing ball (42) for sealing the water spray hole (412) is provided inside the water spray hole (412). A spring (43) is connected to the sealing ball (42). The free end of the spring (43) is fixedly connected to the water storage chamber (411).

10. A superimposed combined intake tower for a hydropower station according to claim 9, characterized in that: The water spray hole (412) has a flared structure, and the diameter of the sealing ball (42) is larger than the inner diameter of the outlet end of the water spray hole (412).

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