A submerged self-flushing energy dissipation and flow regulation device

Abstract

This invention discloses a submerged self-flushing energy dissipation and flow regulation device, including an energy dissipation component. The energy dissipation component includes a flow guide seat and a pipeline water distribution cone, which can divert and dissipate energy from the pipeline water. The pipeline water distribution cone is divided into a front section and a rear section, which form diversion channels with the pipeline and the flow guide seat, respectively. This allows the two parts of the water to collide and dissipate energy at the water confluence outlet, and then enter the external still water body as a ring-shaped high-speed jet. This invention achieves efficient energy dissipation through reasonable diversion and collision and structural design, and is suitable for different working conditions. It provides a safe, economical and reliable means for energy dissipation and flow regulation in water conservancy projects.

Description

Technical Field

[0001] This invention relates to the field of water diversion engineering technology, specifically to a submerged self-flushing energy dissipation and flow regulation device. Background Technology

[0002] In water conservancy projects, energy dissipation refers to the safe and stable diversion of the enormous energy carried by water flow to downstream areas through reasonable energy loss mechanisms. In my country's water diversion projects, energy dissipation channels or equipment are commonly used to achieve this purpose, such as constructing energy dissipation power stations. Hydropower turbine generators not only ensure the safety of the water supply system but also increase the economic value of the water diversion project. However, while constructing energy dissipation power stations, it is also crucial to ensure uninterrupted water supply under any adverse conditions. Therefore, any energy dissipation power station in a water diversion project needs to construct bypass channels to achieve water supply under extreme accident conditions. How to safely divert raw water to downstream water points requires thorough planning and design, taking into account various environmental, facility, and economic conditions within the project. Meanwhile, in long-distance, high-head, and large-flow water diversion projects, how to safely and stably complete the water supply task is also a core task that needs to be solved. In addition, the allocation of water resources in water diversion projects is also a key and difficult point in the water supply task. This requires meeting the needs of water resource regulation on the basis of safe water supply. Therefore, the scenarios of diversion and energy dissipation in the project are increasing. The design of diversion and energy dissipation related projects and the development of special equipment will become increasingly important.

[0003] In the prior art, patent document CN220079932U discloses a return-type energy dissipation device. In this device, high-speed water flow enters the stilling well and first impacts the return-type stilling plate. The guide column at the center of the return-type stilling plate diverts the high-speed water flow. The diverted tailwater flows along the wall of the guide plate, changing its original flow direction to form a conical water flow. After the high-speed water flow is changed in direction by the return-type stilling plate, it collides with the incoming flow in the central area of ​​the stilling well. The two flow patterns collide violently, consuming most of the energy of the high-speed water flow. The energy-dissipated water flow overflows from the overflow outlet of the stilling well. The energy of the overflowing water flow is insufficient to cause damage to downstream buildings and equipment, thus achieving the purpose of energy dissipation.

[0004] However, after the jet passes through the nozzle outlet, it first undergoes friction within the stilling basin. When the jet reaches the guide column of the stilling disc, the jet center will not spray along the jet centerline, but will deviate to some extent. Furthermore, after the initial jet changes direction through the stilling disc, the water flow carrying all the jet energy violently impacts the subsequent water flow ejected from the nozzle, which will block the jet column. After the subsequent jet column is blocked, the jet will oscillate significantly and will penetrate the stilling basin water. When the jet flow rate is too large, due to the small outlet cross-section of the stilling disc and the fact that the stilling disc is filled with water, the internal area of ​​the stilling disc will generate a large negative pressure zone under the impact of the high-speed jet. This will cause severe cavitation, vibration, and noise in the stilling disc. At the same time, the stilling disc, which is suspended and fixed to the inner wall of the stilling basin, is also prone to shaking and falling off under the impact of the high-speed jet. Summary of the Invention

[0005] The purpose of this invention is to provide a submerged self-flushing energy dissipation and flow regulation device. This device solves the negative pressure problem of water diversion by using a pipe diversion cone set between the guide seat and the pipe. The diversion channel formed by the pipe diversion cone, the pipe and the guide seat precisely guides the water, so that the two parts of the water collide at the water confluence outlet for the first energy dissipation. After the collision, the water is ejected from the water confluence outlet in a regular manner and undergoes shear friction with the external still water. The kinetic energy of the water flow is gradually converted into heat, noise and other energy, and eventually tends to be still, thus achieving efficient energy dissipation of the water.

[0006] This invention is achieved through the following technical solution:

[0007] A submerged self-flushing energy dissipation and flow regulation device includes an energy dissipation component for diverting and dissipating water in a pipeline. The energy dissipation component includes a flow guide seat and a pipeline water distribution cone. The flow guide seat is coaxial with the pipeline and spaced apart, and forms an annular water confluence outlet at the interval. The pipeline water distribution cone is connected between the flow guide seat and the pipeline.

[0008] The pipeline water distribution cone includes a front section and a rear section. A first flow channel is formed between the front section and the pipeline to divert a portion of the water. A second flow channel is formed through the middle of the front and rear sections to divert another portion of the water. A third flow channel is formed between the rear section and the guide seat. The second flow channel is connected to the third flow channel.

[0009] The two water bodies collide at the confluence outlet through different channels, and then enter the external still water body as a high-speed annular jet.

[0010] In this scheme, a first flow channel is formed between the pipe distribution cone and the pipe to divert part of the water, guiding this part of the water to the water confluence outlet. At the same time, a second and third flow channel are formed between the pipe distribution cone and the guide seat. The second and third flow channels form an arc-shaped return structure, which also accurately guides another part of the water to the water confluence outlet. The two parts of the water collide at the water confluence outlet, avoiding the generation of a negative pressure zone under the impact of high-speed jet. In addition, the two parts of the water will dissipate the pressurized water flow for the first time during the collision process. The water after the collision will also be ejected at high speed in a 360° direction. After shearing and friction with the external static water, the kinetic energy of the water flow is gradually converted into heat, noise and other energy, and eventually tends to be still, achieving efficient energy dissipation of the water.

[0011] As a further technical solution for the energy dissipation and flow regulation device, the axial cross-sectional shape of the front section of the pipeline water distribution cone is frustum-shaped, and the tail of the pipeline is provided with a trumpet-shaped pipe matching the front section of the pipeline water distribution cone. The front section of the pipeline water distribution cone and the trumpet-shaped pipe form a conical first flow channel. The large-diameter end of the first flow channel faces the water body confluence outlet. The conical first flow channel plays a key guiding and coordinating role in the whole process, so that the water flow can dissipate energy according to the predetermined path and method, thereby improving the energy dissipation efficiency.

[0012] As a further technical solution of the energy dissipation and flow regulation device, the energy dissipation and flow regulation device also includes a flow regulation component. The flow regulation component is used to regulate the flow rate to the energy dissipation component. By regulating the flow rate in the pipeline, the flow velocity can be adjusted so that the two parts of water flow entering the collision area have sufficient energy. When the two parts of water flow with higher energy collide at the outlet, a stronger impact can be generated, thereby converting more water flow energy into heat and other energy, and improving the collision energy dissipation effect.

[0013] As a further technical solution for the energy dissipation and flow regulation device, the flow regulation component includes a nozzle housing and a nozzle body;

[0014] The nozzle body is connected to the middle part of the nozzle housing and is located on the same axis as the energy dissipation component;

[0015] The nozzle housing is connected to the pipe via a nozzle tapering section. The nozzle body is driven by a hydraulic mechanism to reciprocate the nozzle tapering section, causing the flow area of ​​the pipe inlet to change synchronously. The flow area of ​​the pipe is controlled by the back-and-forth movement of the nozzle tip, thereby controlling the flow rate of the pipe.

[0016] As a further technical solution for the energy dissipation and flow regulation device, the radial cross-sectional areas of the first flow channel and the second flow channel at the inlet are equal, both being half the radial cross-sectional area of ​​the pipe, ensuring that the two parts of water after diversion have the same volume, thereby ensuring that the diversion effect meets the energy dissipation requirements, so that the two parts of water flow can more effectively achieve energy conversion in the subsequent collision energy dissipation process.

[0017] As a further technical solution for the energy dissipation and flow regulation device, the wall surface of the rear section of the pipeline water distribution cone facing the guide seat is an arc surface. When the water flows out through the third flow channel, the water flows out along the tangential direction of the third flow channel and collides with the water flowing out along the first flow channel. In this solution, the guide seat and the rear section of the pipeline water distribution cone form a return-type circular channel. Guided by the return-type circular channel, the two parts of the water flow can collide at a more suitable angle and speed, thereby generating a stronger impact. This strong impact can convert more water flow energy into heat and other energy during the collision process, improving the efficiency of collision energy dissipation, and also avoiding the problem of the guide seat easily shaking and falling off under the impact of high-speed jet.

[0018] As a further technical solution for the energy dissipation and flow regulation device, the energy dissipation component also includes an inner water-dividing cone located in the middle of the second flow channel. One end of the inner water-dividing cone is connected to the flow guide seat, and the other end of the inner water-dividing cone extends into the pipe to further guide the water body precisely, making the energy dissipation method more scientific and reasonable.

[0019] As a further technical solution for the energy dissipation and flow regulation device, multiple second connecting plates are connected between the internal water distribution cone and the second flow channel, and multiple third connecting plates are connected between the pipeline water distribution cone, the flow guide seat, and the pipeline. The second connecting plates and the third connecting plates are evenly distributed along the axis of the pipeline water distribution cone. The second connecting plates and the third connecting plates improve the overall stability of the device, enabling it to withstand the impact force of water flow and ensuring that the device remains stable during long-term operation.

[0020] As a further technical solution of the energy dissipation and flow regulation device, the pipeline water distribution cone also includes a middle section of the pipeline water distribution cone, which is a hollow cylinder. The front section and the rear section of the pipeline water distribution cone are respectively connected to the two ends of the middle section of the pipeline water distribution cone.

[0021] The outer wall of the middle section of the pipeline water distribution cone faces the water confluence outlet, and the axial length of the middle section of the pipeline water distribution cone is greater than the width of the water confluence outlet. This further adjusts the two guided water bodies to collide in the same direction, making the energy dissipation method more scientific and reasonable.

[0022] As a further technical solution for the energy dissipation and flow regulation device, the radial cross-sectional areas of the first flow channel and the second flow channel at the water inlet are equal, both being half of the radial cross-sectional area of ​​the pipe;

[0023] The radial cross-sectional areas of the first and second flow channels gradually decrease along the direction of water flow.

[0024] In this solution, the overall pipe diameter remains unchanged. The direction of water flow is adjusted by changing the cone angle at the front of the water distribution cone. This method is suitable for different pipe outer diameters and is more applicable to low head and low flow conditions. Furthermore, this solution allows the annular jet to be directly sprayed into the atmosphere and dissipate energy through friction with the air, making it applicable to a wider range of scenarios.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] 1. This invention divides the water body into two parts by forming a diversion channel with the pipeline and the guide seat. The two parts of the water body collide at the outlet. Part of the energy is converted into heat and other energy through the collision. After the collision, a ring-shaped high-speed jet is formed. The ring-shaped jet shears and rubs against the still water body, further converting the kinetic energy of the water flow into heat, noise and other energy, and finally making the water flow tend to be still, thus achieving efficient energy dissipation. This invention provides a safe, economical and reliable energy dissipation method for high head and large flow rate energy dissipation tasks.

[0027] 2. In this invention, a second and third flow channels are formed between the water distribution cone and the guide seat. The second and third flow channels form an arc-shaped return structure, which accurately guides another part of the water to the water confluence outlet. The two parts of the water collide at the water confluence outlet, avoiding the generation of a negative pressure zone under the impact of high-speed jet. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure marked C;

[0031] Figure 3 for Figure 1 A schematic diagram of the structure marked B in the middle;

[0032] Figure 4 for Figure 1 A cross-sectional view of the structure marked AA.

[0033] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0034] Figure 6 This is a schematic diagram of fluid simulation for the present invention.

[0035] The attached diagram shows the markings and corresponding component names:

[0036] 1-Flow regulation component, 2-Pipeline, 3-Energy dissipation component, 4-Nozzle housing, 5-Nozzle body, 6-First connecting plate, 7-Nozzle tapering section, 8-Needle, 9-Guide seat, 10-Bell-shaped pipe, 11-First flow channel, 12-Front section of pipe water distribution cone, 13-Second flow channel, 14-Internal water distribution cone, 15-Second connecting plate, 16-Third connecting plate, 17-Water pool, 18-Middle section of pipe water distribution cone, 19-Water confluence outlet, 20-Rear section of pipe water distribution cone, 21-Third flow channel. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0038] Example 1

[0039] This embodiment 1 provides a submerged self-flushing energy dissipation and flow regulation device, such as Figure 1 As shown, it includes an energy dissipation component 3, a pipe 2, and a flow regulation component 1. The flow regulation component 1 regulates the flow rate of the water in the pipe 2. The regulated water enters the energy dissipation component 3 for preliminary energy dissipation. The water after preliminary energy dissipation is injected into the still water in the pool 17, further converting the remaining kinetic energy of the water flow into heat, noise, and other forms of energy, ultimately causing the water flow to become still, achieving efficient energy dissipation. This provides a safe, economical, and reliable energy dissipation method for high-head, high-flow-rate energy dissipation tasks.

[0040] Please refer to Figure 2 As shown, the flow regulating component 1 includes a nozzle housing 4 and a nozzle body 5. The nozzle body 5 is connected to the inside of the nozzle housing 4 through a plurality of first connecting plates 6. The nozzle body 5 and the energy dissipation component 3 are located on the same axis. In this embodiment, in order to reduce the influence of the first connecting plates 6 on the water flow, the first connecting plates 6 are evenly distributed along the axis of the nozzle body 5 and extend along the direction of water flow.

[0041] Meanwhile, a nozzle tapering section 7 is connected between the nozzle housing 4 and the inlet of the pipe 2. The radial cross-sectional area of ​​the nozzle tapering section 7 gradually decreases along the direction of the inlet of the pipe 2. The nozzle body 5 drives the nozzle needle 8 to reciprocate towards the nozzle tapering section through a hydraulic mechanism, so that the flow area of ​​the inlet of the pipe 2 changes synchronously, thereby controlling the flow area and thus controlling the flow rate in the pipe. This hydraulic drive method is existing technology and is only briefly described here. The nozzle body 5 is provided with a nozzle flow channel and a hydraulic oil chamber. The nozzle flow channel and the hydraulic oil chamber form an oil-water isolation chamber. A piston shaft is provided in the hydraulic oil chamber. The piston shaft is connected to the nozzle needle 8. An assembly ring is provided between the piston shaft and the nozzle needle 8. The piston shaft can be controlled by the hydraulic drive device to drive the nozzle needle 8 to move back and forth.

[0042] Please refer to Figure 3 and Figure 4 As shown, the energy dissipation component 3 includes a flow guide seat 9 and a pipe water distribution cone. The flow guide seat 9 is coaxial with the pipe 2 and spaced apart, forming an annular water confluence outlet 19 at the interval. The pipe water distribution cone is connected between the flow guide seat 9 and the pipe 2. A first flow channel 11 is formed between the pipe water distribution cone and the pipe 2 to divert part of the water and guide this part of the water to the water confluence outlet 19. At the same time, a second flow channel 13 and a third flow channel 21 are formed between the pipe water distribution cone and the flow guide seat 9. The second flow channel 13 and the third flow channel 21 form an arc-shaped return structure, which also accurately guides another part of the water to the water confluence outlet 19. The two parts of the water collide at the water confluence outlet 19.

[0043] For details, please refer to [link / reference]. Figure 3 and Figure 4 As shown, the pipeline water distribution cone includes a front section 12, a middle section 18, and a rear section 20.

[0044] The axial cross-sectional shape of the front section 12 of the water distribution cone is frustum-shaped. The tail of the pipe 2 is connected to a funnel-shaped pipe 10 that matches the front section 12 of the water distribution cone. The front section 12 of the water distribution cone and the funnel-shaped pipe 10 form a conical first flow channel 11. The large diameter end of the first flow channel 11 faces the water confluence outlet 19. In use, a portion of the water in the pipe 2 is diverted to the water confluence outlet 19 by the conical first flow channel cavity.

[0045] The middle section 18 of the water distribution cone is a hollow cylinder. The front section 12 and the rear section 20 of the water distribution cone are respectively connected to the two ends of the middle section 18. The outer wall of the middle section 18 faces the water confluence outlet 19, and the axial length of the middle section 18 is greater than the width of the water confluence outlet 19.

[0046] The first section 12, the middle section 18, and the second section 20 of the water distribution cone are connected to form a second flow channel 13 for diverting another part of the water in the pipe 2. At the same time, the wall surface of the second section 20 facing the guide seat 9 is an arc surface, and the inner wall surface of the guide seat 9 is also a matching arc surface. Therefore, a third flow channel 21 with an arc-shaped return structure is formed between the second section 20 and the guide seat 9. The second flow channel 13 is connected to the third flow channel 21. The water guided into the second flow channel 13 flows out along the outlet tangent of the third flow channel 21 and collides with the water flowing out along the first flow channel 11 at the water confluence outlet 19.

[0047] Therefore, the two water bodies collide at the water body confluence outlet 19 through different flow channels to complete the first energy dissipation. Then, they enter the external still water body as a high-speed annular jet. Since the water body confluence outlet 19 is submerged, the annular jet, compared to the cylindrical jet, greatly increases the friction area between the jet and the still water body. With a certain pool depth, sufficient water friction area can be obtained, ultimately achieving efficient energy dissipation of the water body. (See reference...) Figure 6 The simulation results shown in the figure demonstrate that this embodiment provides a safe, economical, and reliable energy dissipation method for high-head, high-flow-rate energy dissipation tasks.

[0048] In some embodiments, in order to further guide the water body more precisely and make the energy dissipation method more scientific and reasonable, the energy dissipation component 3 also includes an inner water-dividing cone 14 located in the middle of the second flow channel 13. One end of the inner water-dividing cone 14 is connected to the flow guide seat 9, and the other end of the inner water-dividing cone 14 extends toward the pipe 2.

[0049] Meanwhile, in this embodiment, the water distribution cone is subjected to a large water flow impact force. To ensure the stability of the device during long-term operation, please refer to [further details needed]. Figure 3 and Figure 4 As shown, multiple second connecting plates 15 connect the internal water distribution cone 14 to the second flow channel 13, and multiple third connecting plates 16 connect the pipeline water distribution cone to the guide seat 9 and the pipe 2. The second connecting plates 15 and the third connecting plates 16 are evenly distributed along the axis of the pipeline water distribution cone, and the overall stability of the device is improved by the second connecting plates 15 and the third connecting plates 16.

[0050] In some embodiments, to ensure that the two water bodies after diversion have the same volume, the radial cross-sectional areas of the first flow channel 11 and the second flow channel 13 at the inlet are equal, both being half the radial cross-sectional area of ​​the pipe 2. The specific calculation method is as follows:

[0051] The volume of water in the pipe is V=S*H, where S is the cross-sectional area of ​​the pipe and H is the length of the pipe. To ensure that the two parts of the water are of the same volume when the flow is split, the position of the water distribution cone in the pipe is taken as 0.5S, and the corresponding radius is r=(0.5S / Π)^0.5.

[0052] Example 2

[0053] To provide a device for energy dissipation under low head and low flow conditions, this embodiment 2 provides a submerged self-flushing energy dissipation and flow regulation device based on embodiment 1, such as... Figure 5 As shown, the main difference from Embodiment 1 is that the cone angle of the front section 12 of the water distribution cone in the pipeline is different, the corresponding outer diameter of the pipe 2 is different, and the flow regulating component is replaced by other control valves such as ball valves.

[0054] In this embodiment, the radial cross-sectional areas of the first flow channel 11 and the second flow channel 13 at the water inlet are equal, both being half the radial cross-sectional area of ​​the pipe 2. Furthermore, the radial cross-sectional areas of the first flow channel 11 and the second flow channel 13 gradually decrease along the direction of water flow. Thus, when the two parts of water collide at the water confluence outlet 19, most of the kinetic energy will be consumed. Therefore, the annular jet after the collision can be directly sprayed into the atmosphere and complete the final energy dissipation through friction with the air, thereby simplifying the structure and making it more applicable to a wider range of scenarios.

[0055] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A submerged self-flushing energy dissipation and flow regulation device, characterized in that, The energy dissipation component (3) includes a flow guide seat (9) and a pipeline water distribution cone. The flow guide seat (9) is coaxial with the pipeline (2) and spaced apart, and forms an annular water confluence outlet (19) at the interval. The pipeline water distribution cone is connected between the flow guide seat (9) and the pipeline (2). The pipeline water distribution cone includes a front section (12) and a rear section (20). A first flow channel (11) is formed between the front section (12) and the pipeline (2) to divert part of the water. A second flow channel (13) is formed between the front section (12) and the rear section (20) to divert another part of the water. A third flow channel (21) is formed between the rear section (20) and the guide seat (9). The second flow channel (13) is connected to the third flow channel (21). The axial cross-sectional shape of the front section (12) of the water distribution cone is frustum-shaped. The tail of the pipe (2) is provided with a trumpet-shaped pipe (10) that matches the front section (12) of the water distribution cone. The front section (12) of the water distribution cone and the trumpet-shaped pipe (10) form a cone-shaped first flow channel (11). The large diameter end of the first flow channel (11) faces the water body confluence outlet (19). The two water bodies collide at the water body confluence outlet (19) through different flow channels, and then enter the external still water body in a ring-shaped high-speed jet.

2. The submerged self-flushing energy dissipation and flow regulation device according to claim 1, characterized in that, The energy dissipation and flow regulation device further includes a flow regulation component (1), which is used to regulate the flow rate to the energy dissipation component (3).

3. The submerged self-flushing energy dissipation and flow regulation device according to claim 2, characterized in that, The flow regulating component (1) includes a nozzle housing (4) and a nozzle body (5). The nozzle body (5) is connected to the middle of the nozzle housing (4) and is located on the same axis as the energy dissipation component (3); The nozzle housing (4) is connected to the pipe (2) via a nozzle tapering section (7). The nozzle body (5) is driven by a hydraulic mechanism to reciprocate towards the nozzle tapering section (7), thereby causing the flow area of ​​the inlet of the pipe (2) to change synchronously.

4. The submerged self-flushing energy dissipation and flow regulation device according to claim 1, characterized in that, The radial cross-sectional areas of the first flow channel (11) and the second flow channel (13) at the inlet are equal, both being half the radial cross-sectional area of ​​the pipe (2).

5. A submerged self-flushing energy dissipation and flow regulation device according to claim 1, characterized in that, The wall surface of the rear section (20) of the pipeline water distribution cone facing the guide seat (9) is an arc surface. When the water flows out through the third flow channel (21), the water flows out along the tangential direction of the third flow channel (21) and collides with the water flowing out along the first flow channel (11).

6. A submerged self-flushing energy dissipation and flow regulation device according to any one of claims 1-5, characterized in that, The energy dissipation component (3) also includes an inner water-dividing cone (14) located in the middle of the second flow channel (13), one end of the inner water-dividing cone (14) is connected to the flow guide seat (9), and the other end of the inner water-dividing cone (14) extends toward the pipe (2).

7. A submerged self-flushing energy dissipation and flow regulation device according to claim 6, characterized in that, Multiple second connecting plates (15) are connected between the internal water distribution cone (14) and the second flow channel (13). Multiple third connecting plates (16) are connected between the pipeline water distribution cone, the guide seat (9), and the pipeline (2). The second connecting plates (15) and the third connecting plates (16) are evenly distributed along the axis of the pipeline water distribution cone.

8. A submerged self-flushing energy dissipation and flow regulation device according to claim 6, characterized in that, The pipeline water distribution cone also includes a middle section (18) of the pipeline water distribution cone. The middle section (18) of the pipeline water distribution cone is a hollow cylinder. The front section (12) of the pipeline water distribution cone and the rear section (20) of the pipeline water distribution cone are respectively connected to the two ends of the middle section (18) of the pipeline water distribution cone. The outer wall of the middle section (18) of the pipeline water distribution cone faces the water confluence outlet (19), and the axial length of the middle section (18) of the pipeline water distribution cone is greater than the width of the water confluence outlet (19).

9. A submerged self-flushing energy dissipation and flow regulation device according to claim 1, characterized in that, The radial cross-sectional areas of the first flow channel (11) and the second flow channel (13) at the inlet are equal, both being half the radial cross-sectional area of ​​the pipe (2); The radial cross-sectional areas of the first flow channel (11) and the second flow channel (13) gradually decrease along the direction of water flow.

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