Submerged type self-flushing energy dissipation flow adjusting device

Abstract

The submerged type self-flushing energy dissipation flow adjusting device comprises an energy dissipation assembly, the energy dissipation assembly comprises a flow guide base and a pipeline water distribution cone and can conduct flow distribution and energy dissipation on a pipeline water body, the pipeline water distribution cone is divided into a pipeline water distribution cone front section and a pipeline water distribution cone rear section, and the pipeline water distribution cone front section, the pipeline water distribution cone rear section, a pipeline and the flow guide base form flow distribution channels correspondingly; by means of reasonable flow division collision and structural design, efficient energy dissipation is achieved, the device is suitable for different working conditions, and a safe, economical and reliable means is provided for energy dissipation and flow regulation in water conservancy projects.

Description

Technical Field

[0001] The invention relates to the technical field of water regulation engineering, and in particular to a submerged self-flushing energy dissipation flow regulating device. Background Art

[0002] In water conservancy projects, energy dissipation refers to the safe and stable diversion of the huge energy carried by the water flow to the downstream after it is consumed through reasonable energy loss methods. In my country's water diversion projects, energy dissipation channels or energy dissipation equipment are often used to achieve the purpose of energy dissipation. For example, the construction of energy dissipation power stations and hydro-turbine generators can not only ensure the safety of the water supply system, but also increase the economic value of the water diversion project. However, when building energy dissipation power stations, it is also necessary to ensure that the core task of maintaining water supply cannot be interrupted under any adverse circumstances. Therefore, any energy dissipation power station in any water diversion project needs to build a bypass channel to achieve the water supply task under extreme accident conditions of the power station. How to safely divert raw water to the downstream water use point requires full planning and design in combination with various environmental conditions, facility conditions, and economic conditions in the project. At the same time, 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 water diversion projects, the allocation of water resources is also a key difficulty in the water supply task. This requires that on the basis of safe water supply, the needs of water resource regulation must be met. Therefore, the scenarios where flow regulation and energy dissipation need to be carried out in the project are also increasing. The design of flow regulation and energy dissipation related projects and the development of special equipment will become increasingly important.

[0003] In the prior art, the patent document with publication number CN220079932U discloses a return type energy dissipation device, in which the high-speed water flow first impacts the return type energy dissipation disk after entering the energy dissipation well, and the guide column in the center of the return type energy dissipation disk diverts the high-speed water flow, and the tail water after diversion flows along the wall of the guide disk to change the original flow direction, forming a conical water flow, and the high-speed water flow is changed by the return type energy dissipation disk. After the flow direction is changed by the return type energy dissipation disk, it collides with the incoming flow in the central area of ​​the energy dissipation well, and the two flow states of water flow violently impact, consuming most of the energy of the high-speed water flow. The water flow that has passed the energy dissipation overflows from the overflow port of the energy dissipation well, and the overflowing water flow energy is not enough to cause damage to downstream buildings and devices, thereby achieving the purpose of energy dissipation.

[0004] However, after the jet passes through the nozzle outlet, it will first rub in the energy dissipation pool. When the jet reaches the guide column of the energy dissipation disk, the center of the jet will not be ejected along the center line of the jet, and there will be a certain offset; and after the initial jet changes its flow direction after passing through the energy dissipation disk, the water flow carrying all the jet energy will violently impact with the subsequent water flow ejected from the nozzle, which will block the jet water column. After the subsequent jet water column is blocked, the jet will swing significantly and will penetrate the water body of the energy dissipation pool; when the jet flow rate is too large, due to the small outlet cross-section of the energy dissipation disk and the energy dissipation disk is filled with water, the internal area of ​​the energy dissipation disk will generate a huge negative pressure area under the impact of the high-speed jet, which will cause severe cavitation, vibration and noise in the energy dissipation disk. At the same time, the energy dissipation disk is suspended and fixed on the inner wall of the energy dissipation pool, which is very easy to shake and fall off under the impact of the high-speed jet. Summary of the invention

[0005] The purpose of the present invention is to provide a submerged self-flushing energy dissipation and flow regulating device, which solves the negative pressure problem of water diversion by means of a pipeline water diversion cone arranged between a guide seat and a pipeline, and the diversion flow channel formed by the pipeline water diversion cone, the pipeline and the guide seat accurately guides the water body, so that the two parts of the water body collide at the water body intersection outlet for the first energy dissipation, and the water body after the collision is regularly ejected from the water body intersection outlet, and after shearing and friction with the external static water body, the kinetic energy of the water flow is gradually converted into heat, noise and other remaining energy, and finally tends to be static, thereby realizing efficient energy dissipation of the water body.

[0006] The present invention is achieved through the following technical solutions:

[0007] A submerged self-flushing energy dissipation and flow regulating device, comprising an energy dissipation component for diverting and dissipating water in a pipeline, the energy dissipation component comprising a flow guide seat and a pipeline water diversion cone, the flow guide seat is coaxial with the pipeline and is arranged at an interval, and forms an annular water body intersection outlet at the interval, and the pipeline water diversion cone is connected between the flow guide seat and the pipeline;

[0008] Wherein, the pipeline water diversion cone comprises a front section of the pipeline water diversion cone and a rear section of the pipeline water diversion cone, a first flow channel is formed between the front section of the pipeline water diversion cone and the pipeline to divert part of the water body, a second flow channel is formed through the middle of the front section of the pipeline water diversion cone and the rear section of the pipeline water diversion cone to divert another part of the water body, a third flow channel is formed between the rear section of the pipeline water diversion cone and the guide seat, and the second flow channel is connected to the third flow channel;

[0009] The two parts of water collide at the water body intersection outlet through different flow channels respectively, and then enter the external static water body in the form of annular high-speed jets.

[0010] In this solution, since a first flow channel is formed between the pipeline water diversion cone and the pipeline to divert part of the water body and guide this part of the water body to the water body intersection outlet, and at the same time, a second flow channel and a third flow channel are formed between the pipeline water diversion cone and the guide seat, the second flow channel and the third flow channel constitute an arc return structure, which accurately guides the other part of the water body to the water body intersection outlet. The two parts of the water body collide at the water body intersection outlet, avoiding the generation of a negative pressure zone under the impact of high-speed jets, and the two parts of the water body will perform the first energy dissipation of the pressurized water flow during the collision process. The water body after the collision will also be ejected at a high speed in a 360° azimuth, and after shearing and friction with the external static water body, the kinetic energy of the water flow is gradually converted into other energies such as heat and noise, and finally tends to be still, thereby achieving efficient energy dissipation of the water body.

[0011] As a further technical solution to the energy dissipation and flow regulating device, the axial cross-section of the front section of the pipeline water diversion cone is truncated cone-shaped, and a trumpet-shaped pipe matching the front section of the pipeline water diversion cone is provided at the tail of the pipeline. The front section of the pipeline water diversion cone and the trumpet-shaped pipe form the first conical flow channel, and the large diameter end of the first flow channel faces the water body intersection 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 a predetermined path and method, thereby improving the energy dissipation efficiency.

[0012] As a further technical solution of the energy dissipation and flow regulating device, the energy dissipation and flow regulating device also includes a flow regulating component, which is used to adjust the flow rate flowing to the energy dissipation component. By adjusting the pipeline flow rate and thus the flow rate, the two parts of water flow entering the collision area can 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, thereby improving the effect of collision energy dissipation.

[0013] As a further technical solution of the energy dissipation and flow regulating device, the flow regulating assembly includes a nozzle housing and a nozzle body;

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

[0015] The nozzle tapered section is connected between the nozzle housing and the pipeline. The nozzle body drives the spray needle to reciprocate toward the nozzle tapered section through a hydraulic mechanism, so that the flow area of ​​the pipeline water inlet changes synchronously. The flow area is controlled by the forward and backward movement of the spray needle tip part, thereby controlling the pipeline flow.

[0016] As a further technical solution of the energy dissipation and flow regulating 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, thereby ensuring that the volumes of the two parts of water after diversion are the same, thereby ensuring that the diversion effect meets the energy dissipation requirements, and enabling the two parts of water flow to more effectively realize energy conversion in the subsequent collision and energy dissipation process.

[0017] As a further technical solution to the energy dissipation and flow regulating device, the wall surface on the rear section of the pipeline water diverting cone facing the guide seat is an arc surface. When the water body flows out through the third flow channel, the water body flows out along the tangent direction of the third flow channel and collides with the water body flowing out along the first flow channel. In this solution, the guide seat and the rear section of the pipeline water diverting cone form a return circular channel. Through the guidance of the return circular channel, the two parts of water flow can collide at a more appropriate 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, thereby improving the efficiency of collision energy dissipation and avoiding the problem of the guide seat shaking and falling off under the impact of high-speed jets.

[0018] As a further technical solution of the energy dissipation and flow regulating device, the energy dissipation component also includes an internal water diversion cone located in the middle of the second flow channel, one end of the internal water diversion cone is connected to the guide seat, and the other end of the internal water diversion cone extends toward the pipeline, further accurately guiding the water body, making the energy dissipation method more scientific and reasonable.

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

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

[0021] Among them, the outer wall surface of the middle section of the pipeline water diversion cone faces the water body intersection outlet, and the axial length of the middle section of the pipeline water diversion cone is greater than the width of the water body intersection outlet, further adjusting the two parts of the guided water bodies in the same collision direction, making the energy dissipation method more scientific and reasonable.

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

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

[0024] In this solution, the pipeline as a whole no longer changes in diameter. The direction of the water flow is adjusted by adjusting the cone angle of the front section of the water diversion cone of the pipeline. This method corresponds to a different outer diameter of the pipeline and is more suitable for low head and small flow conditions. This solution allows the annular jet to be directly ejected in the atmosphere to dissipate energy through friction with the air, and has a wider range of application scenarios.

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

[0026] 1. The present invention divides the water body into two parts through the diversion flow channel formed by the pipeline water diversion cone, the pipeline and the guide seat. The two parts of the water body collide at the outlet, and a part of the energy is converted into heat and other energy through the collision. After the collision, an annular high-speed jet is formed. The annular jet shears and rubs with the static water body, further converting the kinetic energy of the water flow into other energy such as heat and noise, and finally making the water flow tend to be static, realizing efficient energy dissipation, and providing a safe, economical and reliable energy dissipation means for high head and large flow energy dissipation tasks.

[0027] 2. In the present invention, a second flow channel and a third flow channel are formed between the water-dividing cone and the guide seat of the pipeline. The second flow channel and the third flow channel constitute an arc-shaped return structure, which accurately guides another part of the water body to the water body intersection outlet. The two parts of the water body collide at the water body intersection outlet, avoiding the generation of a negative pressure zone under the impact of a high-speed jet. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. 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 Schematic diagram of the structure marked with B;

[0031] Figure 3 for Figure 1 Schematic diagram of the structure marked with C;

[0032] Figure 4 for Figure 1 A schematic diagram of a cross-sectional structure marked AA in the figure;

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

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

[0035] Marks and corresponding parts names in the attached drawings:

[0036] 1-flow regulating component, 2-pipeline, 3-energy dissipation component, 4-nozzle housing, 5-nozzle body, 6-first connecting plate, 7-nozzle tapered section, 8-spray needle, 9-flow guide seat, 10-trumpet-shaped pipe, 11-first flow channel, 12-front section of pipeline water diversion cone, 13-second flow channel, 14-internal water diversion cone, 15-second connecting plate, 16-third connecting plate, 17-water tank, 18-middle section of pipeline water diversion cone, 19-water body intersection outlet, 20-rear section of pipeline water diversion cone, 21-third flow channel. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description 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 regulating device, such as Figure 1 As shown, it includes an energy dissipation component 3, a pipeline 2 and a flow regulating component 1. The flow regulating component 1 regulates the water flow in the pipeline 2. The regulated water enters the energy dissipation component 3 for preliminary energy dissipation. The water after preliminary energy dissipation is injected into the static water of the pool 17, and the remaining kinetic energy of the water flow is further converted into heat, noise and other energy, so that the water flow tends to be static, and efficient energy dissipation is achieved, which provides a safe, economical and reliable energy dissipation means for high head and large flow energy dissipation tasks.

[0040] Among them, see Figure 2 As shown, the flow regulating assembly 1 includes a nozzle housing 4 and a nozzle body 5. The nozzle body 5 is connected to the inside of the nozzle housing 1 through a plurality of first connecting plates 6, and the nozzle body 5 and the energy dissipation assembly 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 flow direction of the water.

[0041] At the same time, a nozzle tapered section 7 is connected between the nozzle housing 5 and the water inlet of the pipe 2. The radial cross-sectional area of ​​the nozzle tapered section 7 gradually decreases along the water inlet direction of the pipe 2, and the nozzle body 5 drives the spray needle 8 to reciprocate toward the nozzle tapered section through a hydraulic mechanism, so that the flow area of ​​the water inlet of the pipe 2 changes synchronously, thereby achieving the purpose of controlling the flow surface area, thereby controlling the flow in the pipe. The hydraulic driving method is a prior art and is only briefly described here, that is, a nozzle flow channel and a hydraulic oil chamber are arranged inside the nozzle body 5, the nozzle flow channel and the hydraulic oil chamber form an oil-water isolation chamber, a piston shaft is arranged in the hydraulic oil chamber, the piston shaft is connected to the spray needle 8, and an assembly ring is arranged between the piston shaft and the spray needle 8. The piston shaft can be controlled by a hydraulic driving device to drive the spray needle 8 to move forward and backward.

[0042] Among them, see Figure 3 and Figure 4 As shown, the energy dissipation component 3 includes a guide seat 9 and a pipeline water diversion cone. The guide seat 9 is coaxial with the pipeline 2 and is arranged at an interval, and a ring-shaped water body intersection outlet 19 is formed at the interval. The pipeline water diversion cone is connected between the guide seat 9 and the pipeline 2. A first flow channel 11 is formed between the pipeline water diversion cone and the pipeline 2 to divert part of the water body and guide the part of the water body to the water body intersection outlet 19. At the same time, a second flow channel 13 and a third flow channel 21 are formed between the pipeline water diversion cone and the guide seat 9. The second flow channel 13 and the third flow channel 21 constitute an arc return structure, which accurately guides another part of the water body to the water body intersection outlet 19. The two parts of the water body collide at the water body intersection outlet 19.

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

[0044] Among them, the axial cross-section shape of the front section 12 of the pipeline water-dividing cone is a truncated cone, and the tail end of the pipeline 2 is connected to a trumpet-shaped pipeline 10 that matches the front section 12 of the pipeline water-dividing cone. The front section 12 of the pipeline water-dividing cone and the trumpet-shaped pipeline 10 form a conical first flow channel 11, and the large diameter end of the first flow channel 11 faces the water body intersection outlet 19. In use, a part of the water in the pipeline 2 is diverted by the conical first flow channel cavity and diverted to the water body intersection outlet 19.

[0045] Among them, the middle section 18 of the pipeline water diversion cone is a hollow cylinder, the front section 12 of the pipeline water diversion cone and the rear section 20 of the pipeline water diversion cone are respectively connected to the two ends of the middle section 18 of the pipeline water diversion cone, the outer wall surface of the middle section 18 of the pipeline water diversion cone faces the water body intersection outlet 19, and the axial length of the middle section 18 of the pipeline water diversion cone is greater than the width of the water body intersection outlet 19.

[0046] Among them, the front section 12 of the pipeline water diverter cone, the middle section 18 of the pipeline water diverter cone and the middle part of the rear section 20 of the pipeline water diverter cone are connected to form a second flow channel 13 for diverting another part of the water in the pipeline 2. At the same time, the wall surface of the rear section 20 of the pipeline water diverter cone facing the guide seat 9 is an arc surface, and the corresponding 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 rear section 20 of the pipeline water diverter cone 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 direction of the third flow channel 21 and collides with the water flowing out along the first flow channel 11 at the water intersection outlet 19.

[0047] Therefore, the two parts of water collide at the water intersection outlet 19 through different flow channels to complete the first energy dissipation, and then enter the external static water body in an annular high-speed jet. Since the water intersection outlet 19 is submerged under water, the annular jet greatly increases the friction area between the jet and the static water body compared to the cylindrical jet. Through a certain pool depth, sufficient water friction area can be obtained, and finally the efficient energy dissipation of the water body is achieved. For reference, Figure 6 As shown in the simulation result diagram, this embodiment provides a safe, economical and reliable energy dissipation method for high head and large flow energy dissipation tasks.

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

[0049] At the same time, in this embodiment, the water flow impact force on the pipeline water diversion cone is relatively large. In order to ensure that the device remains stable during long-term operation, please refer to Figure 3 and Figure 4 As shown, a plurality of second connecting plates 15 are connected between the internal water-dividing cone 14 and the second flow channel 13, and a plurality of third connecting plates 16 are connected between the pipeline water-dividing cone and 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-dividing 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 volumes of the two parts of water after diversion are the same, the radial cross-sectional areas of the first flow channel 11 and the second flow channel 13 at the water inlet are equal, both of which are half of the radial cross-sectional area of ​​the pipeline 2. The specific calculation method is:

[0051] The volume of water in the pipeline is V=S*H, where S is the cross-sectional area of ​​the pipeline and H is the length of the pipeline. In order to ensure that the volumes of the two parts of the water are the same during diversion, the position of the water diversion cone in the pipeline is 0.5S, and the corresponding radius r=(0.5S / Π)^0.5.

[0052] Example 2

[0053] In order to provide a device for dissipating energy under low head and small flow conditions, this embodiment 2 provides a submerged self-flushing energy dissipation and flow regulating device based on embodiment 1, such as Figure 5 As shown, the main difference from Example 1 is that the cone angle of the front section 12 of the pipeline water dividing cone is different, the corresponding outer diameter of the pipeline 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 of which are half of the radial cross-sectional area of ​​the pipeline 2, and the radial cross-sectional areas of the first flow channel 11 and the second flow channel 13 are synchronously gradually reduced along the flow direction of the water body. In this way, when the two parts of water body collide at the water body intersection outlet 19, most of the kinetic energy will be consumed. Therefore, the annular jet after the collision can be directly ejected into the atmosphere to complete the final energy dissipation by friction with the air, thereby streamlining the structure and making it applicable to a wider range of scenarios.

[0055] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method 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 in the scope of protection of the present invention.

Claims

1. A submerged self-flushing energy dissipation and flow regulating device, It is characterized in that It comprises an energy dissipation component (3) for diverting and dissipating energy of water in a pipeline (2), the energy dissipation component (3) comprising a flow guide seat (9) and a pipeline water diversion cone, the flow guide seat (9) and the pipeline (2) are coaxial and spaced apart, and form an annular water intersection outlet (19) at the spaced apart position, and the pipeline water diversion cone is connected between the flow guide seat (9) and the pipeline (2); The pipeline water diversion cone comprises a pipeline water diversion cone front section (12) and a pipeline water diversion cone rear section (20); a first flow channel (11) is formed between the pipeline water diversion cone front section (12) and the pipeline (2) to divert part of the water body; a second flow channel (13) is formed through the middle of the pipeline water diversion cone front section (12) and the pipeline water diversion cone rear section (20) to divert another part of the water body; a third flow channel (21) is formed between the pipeline water diversion cone rear section (20) and the guide seat (9); the second flow channel (13) is connected to the third flow channel (21); The two parts of water collide at the water body intersection outlet (19) through different flow channels respectively, and then enter the external static water body in the form of annular high-speed jets.

2. A submerged self-flushing energy dissipation and flow regulating device according to claim 1, It is characterized in that The axial cross-section of the pipeline water-dividing cone front section (12) is truncated cone-shaped, and the tail of the pipeline (2) is provided with a trumpet-shaped pipeline (10) matching the pipeline water-dividing cone front section (12). The pipeline water-dividing cone front section (12) and the trumpet-shaped pipeline (10) form the first conical flow channel (11), and the large-diameter end of the first flow channel (11) faces the water body intersection outlet (19).

3. A submerged self-flushing energy dissipation and flow regulating device according to claim 1, It is characterized in that The energy dissipation and flow regulation device further comprises a flow regulation component (1), wherein the flow regulation component (1) is used to regulate the flow rate flowing to the energy dissipation component (3).

4. A submerged self-flushing energy dissipation and flow regulating device according to claim 3, It is characterized in that The flow regulating assembly (1) comprises 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); A nozzle tapered section (7) is connected between the nozzle housing (4) and the pipe (2), and the nozzle body (5) drives the spray needle to reciprocate toward the nozzle tapered section (7) through a hydraulic mechanism, so that the flow area of ​​the water inlet of the pipe (2) changes synchronously.

5. A submerged self-flushing energy dissipation and flow regulating device according to claim 1, It is characterized in that The radial cross-sectional areas of the first flow channel (11) and the second flow channel (13) at the water inlet are equal, and are both half of the radial cross-sectional area of ​​the pipeline (2).

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

7. A submerged self-flushing energy dissipation and flow regulating device according to any one of claims 1 to 6, It is characterized in that The energy dissipation component (3) further comprises an internal water separation cone (14) located in the middle of the second flow channel (13), one end of the internal water separation cone (14) being connected to the flow guide seat (9), and the other end of the internal water separation cone (14) extending toward the pipeline (2).

8. A submerged self-flushing energy dissipation and flow regulating device according to claim 7, It is characterized in that A plurality of second connecting plates (15) are connected between the internal water-dividing cone (14) and the second flow channel (13), and a plurality of third connecting plates (16) are connected between the pipeline water-dividing cone and the guide seat (9) and the pipeline (2), wherein the second connecting plates (15) and the third connecting plates (16) are evenly distributed along the axis of the pipeline water-dividing cone.

9. A submerged self-flushing energy dissipation and flow regulating device according to claim 7, It is characterized in that The pipeline water dividing cone also includes a pipeline water dividing cone middle section (18), the pipeline water dividing cone middle section (18) is a hollow cylinder, and the pipeline water dividing cone front section (12) and the pipeline water dividing cone rear section (20) are respectively connected to the two ends of the pipeline water dividing cone middle section (18); The outer wall surface of the middle section (18) of the pipeline water diversion cone faces the water body confluence outlet (19), and the axial length of the middle section (18) of the pipeline water diversion cone is greater than the width of the water body confluence outlet (19).

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

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