Overflow structure of hydroelectric power station

Abstract

The invention relates to the field of hydroelectric power stations, in particular to an overflow structure of a hydroelectric power station. The dam comprises a dam body, a two-way adjusting assembly and an energy dissipation table. An overflow ramp is arranged on one side of the dam body, and a mounting frame is arranged on the dam body; a filter screen is arranged on the mounting frame; the bidirectional adjusting assembly is arranged on the mounting frame around the periphery of the filter screen; the side, close to the overflow ramp, of the energy dissipation table is provided with a pressure bearing piece, and the side, away from the overflow ramp, of the energy dissipation table is provided with an energy dissipation piece. Firstly, the filter screen is arranged at the water inlet of the overflow ramp to be matched with the two-way adjusting assembly, and preliminary filtering and energy dissipation are carried out. And then multiple groups of energy dissipation ridges with different heights are arranged to dissipate energy step by step. And then an energy dissipation table is arranged to be matched with a diversion channel, and synchronous filtering and diversion energy dissipation are achieved. Through the structure, layer-by-layer energy dissipation is achieved, the ends are filtered and dredged, flood is effectively and safely discharged, and the hydroelectric power station is prevented from bearing too large pressure.

Description

Technical Field

[0001] The present invention relates to the field of hydroelectric power stations, and particularly to an overflow structure of a hydroelectric power station. Background Art

[0002] The overflow structure of a hydroelectric power station is a core facility to ensure the safe operation of the dam. Its main function is to discharge excess water in a controllable manner when the reservoir water level exceeds the design standard, preventing the dam body from bearing excessive pressure or experiencing overtopping accidents due to too high water level. The overflow structure safely guides the flood into the downstream river through facilities such as gates, spillways or discharge holes, and at the same time reduces the impact force of high-speed water flow with energy dissipators (such as flip bucket and stilling basin) to avoid scouring and damage to the downstream riverbed and bank slopes.

[0003] The existing overflow structures of hydroelectric power stations have the following deficiencies: 1. A filter screen is generally set at the water inlet to intercept garbage and sundries, but the filter screen is easily blocked by sediment, resulting in unsmooth water flow and affecting the safety of flood discharge; 2. The traditional stepped overflow surface is mostly used for energy dissipation, with a single energy dissipation method and low energy dissipation efficiency. Summary of the Invention

[0004] Aiming at the problems in the background art, an overflow structure of a hydroelectric power station is proposed. First, a filter screen and a two-way adjustment component are set at the water inlet of the overflow ramp to cooperate for preliminary filtration and energy dissipation. Then, multiple groups of energy dissipation weirs with different heights are set for step-by-step energy dissipation. Then, an energy dissipation platform and a diversion channel are set to cooperate to achieve synchronous filtration and diversion energy dissipation. Through the above structures for layer-by-layer energy dissipation and end filtration and dredging, the flood can be safely discharged effectively, avoiding excessive pressure on the hydroelectric power station.

[0005] The present invention proposes an overflow structure of a hydroelectric power station, including a dam body, a two-way adjustment component and an energy dissipation platform. An overflow ramp is arranged on one side of the dam body, and an installation frame is arranged on the dam body; a filter screen is arranged on the installation frame; the two-way adjustment component is arranged on the installation frame around the outer periphery of the filter screen, and it includes a two-way adjustment member that moves around the filter screen; the two-way adjustment member is of a three-section structure, with one end set as a moving section and the other end connected to an adjustment section through a deformable connection section. When the moving section moves to the water-facing side, the adjustment section swings with the water flow under the impact of the water flow to clean the filter screen. When the moving section moves to the overflow side, the adjustment section swings with the water flow under the impact of the water flow for energy dissipation; the energy dissipation platform is located at the bottom of the overflow ramp, and a pressure-bearing member is arranged on the side of the energy dissipation platform close to the overflow ramp, and an energy dissipation member is arranged on the side far from the overflow ramp; the pressure-bearing member and the energy dissipation member alternately rise and fall for energy dissipation.

[0006] Preferably, the two-way adjustment component includes driving members located on both sides of the filter screen and a transmission belt that moves around the filter screen by sleeving the driving members; multiple groups of two-way adjustment members are arranged along the transmission belt.

[0007] Preferably, the driving member includes a mounting post connected to the mounting frame; rotating discs for sleeving the transmission belt are respectively arranged at the upper and lower ends of the mounting post, and an auxiliary cleaning pipe is arranged in the middle of the mounting post; a first intercepting strip is arranged on one side of the auxiliary cleaning pipe close to the mounting frame; a second intercepting strip cooperating with the first intercepting strip is arranged on the mounting frame; two cleaning frames are arranged on the side of the auxiliary cleaning pipe far from the mounting frame; the two cleaning frames are arranged in a mirror image in front of and behind the filter screen; each cleaning frame includes an extension section connected to the auxiliary cleaning pipe and a bent end located at the end of the extension section.

[0008] Preferably, the bidirectional adjusting member includes a moving rod connected to the transmission belt; first mounting seats are respectively arranged at the upper and lower ends of the moving rod; the two first mounting seats are connected to the two second mounting seats in one-to-one correspondence through connecting chains; a rotatable adjusting rod is arranged between the two second mounting seats; a scraping strip is arranged on the side wall of the adjusting rod; the moving rod is the moving section; the two connecting chains are the connecting sections; the adjusting rod is the adjusting section.

[0009] Preferably, two energy dissipation grooves are arranged on the energy dissipation table, one in front and one behind; the bottoms of the two energy dissipation grooves are communicated; the pressure-bearing member is set as a piston plate, which is slidably arranged in the front energy dissipation groove; the energy dissipation member is set as an energy dissipation frame, which is slidably arranged in the rear energy dissipation groove.

[0010] Preferably, airbag bags are arranged in both of the two energy dissipation grooves; the airbag bags are communicated through pipelines.

[0011] Preferably, the overflow ramp is set as a structure that is narrow at the top and wide at the bottom, and multiple energy dissipation ridges are arranged on the slope; the heights of the multiple energy dissipation ridges are different, and they are combined to form a wavy energy dissipation route.

[0012] Preferably, diversion channels are arranged on both sides of the energy dissipation table; a water inlet communicating with the diversion channel is arranged at the bottom of the front energy dissipation groove.

[0013] Preferably, the diversion channel is set as an arc shape, and an arc-shaped inner diversion cavity and an arc-shaped outer diversion cavity are separated inside through a filter plate; a through hole communicating with the water inlet is arranged on the outer diversion cavity; a water outlet is arranged on the inner diversion cavity.

[0014] Preferably, the filter plate is set as an arc shape; a sand discharge port communicating with the outer diversion cavity is arranged on the diversion channel.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: First, a filter screen and a two-way adjustment component are provided at the water inlet of the overflow ramp. The filter screen is used to intercept garbage and sundries, reducing pollution. The two-way adjustment component forms an adjustable structure that can move around the filter screen and deform through the cooperation of a moving rod, two sets of connecting chains, and an adjusting rod. On the one hand, when this structure is on the water-facing side, the adjusting rod fits against the filter screen under the impact of water flow, cleaning the sediment and sundries on the screen surface. On the other hand, when this structure is on the overflow side, the adjusting rod moves and rotates under the traction of the connecting chain and swings along with the water flow at the same time, reducing the impact force of the water flow. Then, multiple groups of energy dissipation ridges with different heights are provided to achieve the purpose of gradually dissipating energy. Next, an energy dissipation platform and a diversion channel are provided in cooperation. On the one hand, the piston plate and the energy dissipation frame are alternately lifted to block and dissipate the water flow. On the other hand, the water flow enters the diversion channel to achieve simultaneous filtration and diversion. Through the above-mentioned structures, the energy is dissipated layer by layer, the end is filtered and dredged, and the flood is effectively and safely discharged, avoiding excessive pressure on the hydropower station. Description of the Drawings

[0016] Figure 1 Schematic diagram of the overflow structure of the hydropower station in Embodiment 1;

[0017] Figure 2 Top view of the mounting rack, filter screen, and two-way adjustment component;

[0018] Figure 3 Front view of the mounting rack, filter screen, and two-way adjustment component;

[0019] Figure 4 Schematic diagram of the driving part;

[0020] Figure 5 Schematic diagram of the two-way adjustment part;

[0021] Figure 6 Cross-sectional view of the energy dissipation platform;

[0022] Figure 7 Schematic diagram of the overflow structure of the hydropower station in Embodiment 2;

[0023] Figure 8 Schematic diagram of the overflow structure of the hydropower station in Embodiment 3 (Viewpoint 1);

[0024] Figure 9 Schematic diagram of the overflow structure of the hydropower station in Embodiment 3 (Viewpoint 2);

[0025] Figure 10 Structure diagram of the energy dissipation platform and the diversion channel;

[0026] Figure 11 Internal structure diagram of the diversion channel.

[0027] Reference numerals: 1, dam body; 2, overflow ramp; 3, energy dissipation platform; 301, pressure-bearing member; 302, energy dissipation member; 303, energy dissipation groove; 304, water inlet; 305, airbag; 306, pipeline; 4, mounting frame; 5, filter screen; 6, two-way adjustment assembly; 601, driving member; 60101, rotating disc; 60102, mounting column; 60103, auxiliary cleaning pipe; 60104, cleaning frame; 60105, first intercepting strip; 602, two-way adjustment member; 60201, moving rod; 60202, first mounting seat; 60203, connecting chain; 60204, adjusting rod; 60205, scraping strip; 60206, second mounting seat; 603, conveyor belt; 7, energy dissipation weir; 8, diversion channel; 801, outer diversion cavity; 802, inner diversion cavity; 803, filter plate; 804, through hole; 805, water outlet; 806, sediment discharge port. Detailed implementation manners

[0028] In the first embodiment, as Figure 1 shown, the present invention provides an overflow structure for a hydropower station, including a dam body 1, a two-way adjustment assembly 6 and an energy dissipation platform 3. An overflow ramp 2 is arranged on one side of the dam body 1, and a mounting frame 4 is arranged on the dam body 1; a filter screen 5 is arranged on the mounting frame 4; the two-way adjustment assembly 6 is arranged on the mounting frame 4 around the outer periphery of the filter screen 5, and includes a two-way adjustment member 602 that moves around the outer periphery of the filter screen 5; the two-way adjustment member 602 is a three-section structure, one end is set as a moving section, and the other end is connected to an adjustment section through a deformable connecting section. When the moving section moves to the water-facing side, the adjustment section swings with the water flow under the impact of the water flow to clean the filter screen 5. When the moving section moves to the overflow side, the adjustment section swings with the water flow under the impact of the water flow to dissipate energy; the energy dissipation platform 3 is located at the bottom of the overflow ramp 2, a pressure-bearing member 301 is arranged on the side of the energy dissipation platform 3 close to the overflow ramp 2, and an energy dissipation member 302 is arranged on the side far from the overflow ramp 2; the pressure-bearing member 301 and the energy dissipation member 302 alternately lift and lower to dissipate energy.

[0029] As Figures 2 - 3 shown, the two-way adjustment assembly 6 includes a driving member 601 located on both sides of the filter screen 5 and a conveyor belt 603 that moves around the filter screen 5 by sleeving the driving member 601; multiple groups of two-way adjustment members 602 are arranged along the conveyor belt 603.

[0030] It should be further noted that the conveyor belt 603 is set as an upper and lower parallel annular structure; the two-way adjustment member 602 is arranged between the two annular structures and circulates between the water-facing side and the overflow side with the movement of the conveyor belt 603 to switch between the cleaning and energy dissipation functions.

[0031] As Figure 4As shown in the figure, the driving member 601 includes a mounting post 60102 connected to the mounting frame 4; rotating disks 60101 for sleeving the transmission belt 603 are respectively arranged at the upper and lower ends of the mounting post 60102, and an auxiliary cleaning pipe 60103 is arranged in the middle of the mounting post 60102; a first intercepting strip 60105 is arranged on one side of the auxiliary cleaning pipe 60103 close to the mounting frame 4; a second intercepting strip cooperating with the first intercepting strip 60105 is arranged on the mounting frame 4.

[0032] It should be further noted that a clamping groove for opening and closing the transmission belt 603 is arranged on the rotating disk 60101, and the rotating disk 60101 is powered by its own hydroelectric power generation or solar power generation equipment and is driven to rotate.

[0033] It should be further noted that the second intercepting strip and the first intercepting strip 60105 are arranged in a staggered manner and are located in the gap between the auxiliary cleaning pipe 60103 and the mounting frame 4, which can reduce the passage of garbage and sundries, and can also clean the two-way adjusting member 602.

[0034] It should be further noted that two groups of cleaning frames 60104 are arranged on the side of the auxiliary cleaning pipe 60103 far from the mounting frame 4; the two groups of cleaning frames 60104 are arranged in a mirror image, one in front of and the other behind the filter net 5.

[0035] It should be further noted that the cleaning frame 60104 is located between the auxiliary cleaning pipe 60103 and the filter net 5, which can reduce the passage of garbage and sundries, and is located within the moving track of the moving section of the two-way adjusting member 602 and will not interfere with its movement.

[0036] It should be further noted that each group of cleaning frames 60104 includes an extension section connected to the auxiliary cleaning pipe 60103 and a bent end located at the end of the extension section.

[0037] It should be further noted that the extension sections of the cleaning frames 60104 on the two groups of driving members 601 are all parallel to the filter net 5; the convex surfaces of the bent sections of the cleaning frames 60104 on the two groups of driving members 601 face each other, and the bent sections of the two groups of cleaning frames 60104 on each group of driving members 601 extend outwards.

[0038] When the moving section of the two-way adjusting member 602 moves along with the transmission belt 603 and the flexible connection section and the adjusting section encounter the cleaning frame 60104, the bent section can intercept the attached garbage and sundries, reduce the garbage and sundries from passing through the filter net 5, and clean the two-way adjusting member 602 in time to ensure its working effect.

[0039] Such as Figure 5As shown in the figure, the bidirectional adjusting member 602 includes a moving rod 60201 connected to the conveyor belt 603; mounting bases 60202 are respectively arranged at the upper and lower ends of the moving rod 60201; the two groups of mounting bases 60202 are respectively connected to the two groups of mounting bases 60206 through connecting chains 60203; a rotatable adjusting rod 60204 is arranged between the two groups of mounting bases 60206; a scraping strip 60205 is arranged on the side wall of the adjusting rod 60204; the moving rod 60201 is the moving section; the two connecting chains 60203 are the connecting sections; the adjusting rod 60204 is the adjusting section.

[0040] It should be further noted that the length of the connecting chain 60203 is greater than the distance between the moving rod 60201 and the filter screen 5.

[0041] It should be further noted that the upper and lower ends of the moving rod 60201 are respectively connected to the corresponding conveyor belts 603.

[0042] When the moving rod 60201 moves to the water-facing side, the adjusting rod 60204 fits against the filter screen 5 under the impact of the water flow. As the moving rod 60201 moves, the adjusting rod 60204 moves and rotates on the filter screen 5, and the scraping strip 60205 cleans the sediment and debris on the mesh surface. When the moving rod 60201 moves to the overflow side, the adjusting rod 60204 moves and rotates under the traction of the connecting chain 60203, and at the same time swings along with the water flow to achieve the purpose of energy dissipation and reduce the impact force of the water flow.

[0043] As Figure 6 As shown in the figure, two energy dissipation grooves 303 are arranged on the energy dissipation platform 3, one in front of the other; the bottoms of the two energy dissipation grooves 303 are connected; the pressure-bearing member 301 is set as a piston plate and is slidably arranged in the front energy dissipation groove 303; the energy dissipation member 302 is set as an energy dissipation frame and is slidably arranged in the rear energy dissipation groove 303.

[0044] The water flow flows down along the overflow ramp 2 and enters the front energy dissipation groove 303, and the piston plate is pressed down. The air at the bottom is squeezed into the rear energy dissipation groove 303. The energy dissipation frame rises synchronously to block and dissipate the water flow. The greater the water flow, the greater the pressure on the piston plate, and the higher the rising height of the energy dissipation frame. When there is no water flow, the energy dissipation frame is stored in the rear energy dissipation groove 303.

[0045] It should be further noted that airbag bags 305 are arranged in both energy dissipation grooves 303; the airbag bags 305 are connected through pipes 306. One side of the airbag bag 305 is compressed by force, and the other side of the airbag bag 305 bulges. This makes the linkage between the pressure-bearing member 301 and the energy dissipation member 302 smoother and more efficient.

[0046] Embodiment 2, based on Embodiment 1, this embodiment further proposes the structure of the overflow ramp 2, as Figure 7As shown, the overflow ramp 2 is arranged in a structure that is narrower at the top and wider at the bottom, and multiple groups of energy dissipation ridges 7 are arranged on the slope surface; the heights of the multiple groups of energy dissipation ridges 7 are different, and they are combined to form a wavy energy dissipation route; when the water flow passes through the filter screen 5 and flows down along the overflow ramp 2, it passes through the wavy energy dissipation route, achieving the purpose of gradually dissipating energy.

[0047] Embodiment 3. Based on Embodiment 1 and Embodiment 2, this embodiment further proposes the structure of the diversion channel 8, as Figures 10 - 11 shown, diversion channels 8 are arranged on both sides of the energy dissipation platform 3; a water inlet 304 communicating with the diversion channel 8 is arranged at the bottom of the front energy dissipation groove 303; when the piston plate is forced to descend to expose the water inlet 304, the water flow enters the diversion channel 8 for diversion and energy dissipation.

[0048] It should be further noted that the diversion channel 8 is arranged in an arc shape, and an arc-shaped inner diversion cavity 802 and an arc-shaped outer diversion cavity 801 are separated inside by a filter plate 803; a through hole 804 communicating with the water inlet 304 is arranged on the outer diversion cavity 801; a water outlet 805 is arranged on the inner diversion cavity 802.

[0049] It should be further noted that the through hole 804 is arranged at the lower end; the water outlet 805 is arranged at the upper end and is equipped with a one-way valve.

[0050] Water enters through the through hole 804, is filtered by the filter plate 803, and exits through the water outlet 805, realizing synchronous filtration and diversion. The arc-shaped structure has small resistance, and the diversion and energy dissipation are smooth and efficient.

[0051] It should be further noted that the filter plate 803 is arranged in an arc shape; a sand discharge port 806 communicating with the outer diversion cavity 801 is arranged on the diversion channel 8; the arc-shaped filter plate 803 has a large filtering range and is not easily blocked. The accumulated sediment is discharged from the sand discharge port 806 with a valve.

[0052] The working method of the overflow structure of the hydroelectric power station in the present invention is as follows: When the water level on one side of the dam body 1 rises to the height of the filter net 5, it flows to the side of the overflow ramp 2 after being filtered by the filter net 5. During the flow of the water, the adjusting rod 60204 on the water-facing side fits against the filter net 5 under the impact of the water flow. As the moving rod 60201 moves, the adjusting rod 60204 moves and rotates on the filter net 5, and the scraping strip 60205 cleans the sediment and debris on the net surface. The adjusting rod 60204 on the overflow side moves and rotates under the traction of the connecting chain 60203, and at the same time swings along with the water flow to reduce the impact force of the water flow. Then, when the water flows down along the overflow ramp 2, it passes through a wavy energy dissipation route to achieve the purpose of gradually dissipating energy. Then the water enters the front energy dissipation tank 303, and the piston plate is pressed down. The air at the bottom is squeezed to the rear energy dissipation tank 303. The energy dissipation frame rises synchronously to block and dissipate the energy of the water flow. The greater the water flow, the greater the pressure on the piston plate, and the higher the rising height of the energy dissipation frame. When the piston plate is forced to descend until the water inlet 304 is exposed, the water enters the diversion channel 8, enters through the through hole 804, is filtered by the filter plate 803, and exits through the water outlet 805, realizing the synchronization of filtration and diversion.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. An overflow structure of a hydropower station, characterized in that, Comprising: A dam body (1), with an overflow ramp (2) provided on one side of the dam body (1), and a mounting frame (4) provided on the dam body (1); a filter net (5) is provided on the mounting frame (4); A two-way adjustment assembly (6), the two-way adjustment assembly (6) is arranged on the mounting frame (4) around the outer periphery of the filter net (5), and it includes a two-way adjustment member (602) that moves around the outer periphery of the filter net (5); the two-way adjustment member (602) is of a three-section structure, with one end set as a moving section, and the other end connected to an adjustment section through a deformable connection section. When the moving section moves to the water-facing side, under the impact of water flow, the adjustment section swings with the water flow to clean the filter net (5). When the moving section moves to the overflow side, under the impact of water flow, the adjustment section swings with the water flow to dissipate energy; And an energy dissipation platform (3), the energy dissipation platform (3) is located at the bottom of the overflow ramp (2), a pressure-bearing member (301) is provided on one side of the energy dissipation platform (3) close to the overflow ramp (2), and an energy dissipation member (302) is provided on the side far from the overflow ramp (2); the pressure-bearing member (301) and the energy dissipation member (302) alternately rise and fall to dissipate energy.

2. The overflow structure of the hydroelectric power station according to claim 1, characterized in that, The two-way adjustment assembly (6) includes driving members (601) located on both sides of the filter net (5) and a transmission belt (603) that moves around the filter net (5) by sleeving the driving members (601); Multiple groups of two-way adjustment members (602) are arranged along the transmission belt (603).

3. The overflow structure of the hydroelectric power station according to claim 2, wherein, The driving member (601) includes a mounting column (60102) connected to the mounting frame (4); rotating disks (60101) sleeving the transmission belt (603) are respectively provided at the upper and lower ends of the mounting column (60102), and an auxiliary cleaning pipe (60103) is provided in the middle of the mounting column (60102); An intercepting strip one (60105) is provided on one side of the auxiliary cleaning pipe (60103) close to the mounting frame (4); an intercepting strip two that cooperates with the intercepting strip one (60105) is provided on the mounting frame (4); Two groups of cleaning frames (60104) are provided on the side of the auxiliary cleaning pipe (60103) far from the mounting frame (4); the two groups of cleaning frames (60104) are arranged in a mirror image in front of and behind the filter net (5); Each group of cleaning frames (60104) includes an extension section connected to the auxiliary cleaning pipe (60103) and a bent end located at the end of the extension section.

4. The overflow structure of the hydroelectric power station according to claim 2, characterized in that, The two-way adjustment member (602) includes a moving rod (60201) connected to the transmission belt (603); mounting seats one (60202) are respectively provided at the upper and lower ends of the moving rod (60201); the two groups of mounting seats one (60202) are connected to two groups of mounting seats two (60206) one by one through connecting chains (60203); a rotatable adjustment rod (60204) is provided between the two groups of mounting seats two (60206); a scraping strip (60205) is provided on the side wall of the adjustment rod (60204); The moving rod (60201) is the moving section; the two groups of connecting chains (60203) are the connection sections; The adjustment rod (60204) is the adjustment section.

5. The overflow structure of the hydroelectric power station according to claim 1, characterized in that There are two energy dissipation grooves (303) arranged one in front of the other on the energy dissipation platform (3); the bottoms of the two energy dissipation grooves (303) are connected; the pressure-bearing member (301) is set as a piston plate and is slidably arranged in the front energy dissipation groove (303); the energy dissipation member (302) is set as an energy dissipation frame and is slidably arranged in the rear energy dissipation groove (303).

6. The overflow structure of the hydroelectric power station according to claim 5, characterized in that, Airbag bags (305) are arranged in both of the two energy dissipation grooves (303); the airbag bags (305) are connected through pipelines (306).

7. The overflow structure of the hydroelectric power station according to claim 1, characterized in that The overflow ramp (2) is set as a structure that is narrower at the top and wider at the bottom, and multiple groups of energy dissipation ridges (7) are arranged on the slope surface; The heights of the multiple groups of energy dissipation ridges (7) are different, and they are combined to form a wavy energy dissipation route.

8. The overflow structure of the hydroelectric power station according to claim 6, characterized in that, Diversion channels (8) are arranged on both sides of the energy dissipation platform (3); An inlet (304) communicating with the diversion channel (8) is arranged at the bottom of the front energy dissipation groove (303).

9. The overflow structure of the hydroelectric power station according to claim 8, characterized in that, The diversion channel (8) is set as an arc shape, and an arc-shaped inner diversion cavity (802) and an arc-shaped outer diversion cavity (801) are separated inside through a filter plate (803); A through hole (804) communicating with the inlet (304) is arranged on the outer diversion cavity (801); an outlet (805) is arranged on the inner diversion cavity (802).

10. The overflow structure of the hydroelectric power station according to claim 9, characterized in that, The filter plate (803) is set as an arc shape; a sand discharge port (806) communicating with the outer diversion cavity (801) is arranged on the diversion channel (8).

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