Anti-clogging structure for one-way drainage channel

Abstract

The invention provides an anti-clogging structure for a one-way drainage channel, and relates to the technical field of underwater structure clogging prevention. The structure comprises a connecting plate, a first cover body and a second cover body, the connecting plate is provided with a first inlet used for being communicated with the upper side of the one-way drainage channel. The first cover body is connected to the connecting plate through the head top plate and the side plate, and the dip angle of the head top plate of the first cover body relative to the connecting plate ranges from 15 degrees to 75 degrees. The second cover body is connected to the first cover body through a side plate, and an outer water silt flushing channel with the overflowing area gradually reduced in the water flow direction is formed between the second cover body and the first cover body. The water inlet section top plate of the second cover body is parallel to the connecting plate, the heights of the acceleration section and the water outlet section top plate of the second cover body are gradually reduced in the water flow direction, and the tail of the first cover body corresponds to the acceleration section of the second cover body. Kinetic energy of external water is fully utilized, water flow is accelerated through a variable cross-section structure, a total outlet is continuously scoured at a high flow speed, and the self-dredging function is achieved without the help of external force.

Description

Technical Field

[0001] The invention relates to the technical field of underwater structure anti-clogging, and in particular to an anti-clogging structure for a one-way drainage channel. Background Art

[0002] In channels and tunnels, the high groundwater level often causes the channel lining or tunnel side wall to bulge, threatening the safety of water delivery. One-way drainage components such as check valves are usually used to form a one-way drainage channel, so as to drain water into the channel or tunnel in one direction to solve the problem of high groundwater level. This can not only prevent channel water leakage, but also allow groundwater to flow out by gravity in time. However, one-way drainage components such as check valves are installed at the bottom or side walls. The uninterrupted water supply in the channel or tunnel all year round causes fine particles, shells, etc. in the water to enter the check valve, causing blockage or even damage, resulting in failure of the check valve.

[0003] In order to prevent fine particles in the water from entering the one-way drainage channel formed by the check valve, etc., the current main protection is to set an anti-silt cover on the top. There are fan-shaped, duckbill-shaped, etc., which is mainly used to protect the outlet of the one-way drainage channel so that the water flows around the anti-silt cover. The water outlet of the one-way drainage channel is discharged downstream along the direction of the water flow. The fine particles carried in the upstream and upper water flows cannot be deposited in the check valve, thereby achieving the purpose of preventing siltation.

[0004] However, when the external water level is usually low, there is no water flowing out of the one-way drainage channel. When using the existing anti-silt cover, a certain area of ​​low flow rate or even no flow rate will be formed at the outlet. Fine particles in the water flow will settle in this area, causing siltation. Summary of the invention

[0005] In order to solve the technical problem that a certain area of ​​low flow rate or even no flow rate will be formed at the outlet of the existing anti-silt cover in the prior art, and fine particles in the water flow will be deposited in this area, causing siltation, the embodiment of the present invention provides an anti-siltation structure for a one-way drainage channel. The technical solution is as follows:

[0006] Provided is an anti-clogging structure for a one-way drainage channel, the structure comprising: a connecting plate, a first cover body and a second cover body;

[0007] The connecting plate is provided with a first inlet for communicating with the upper side of the one-way drainage channel;

[0008] The first cover body is connected to the connecting plate through a head top plate and side plates, and the inclination angle of the head top plate of the first cover body relative to the connecting plate is between 15° and 75°;

[0009] The second cover body is connected to the first cover body through a side plate, and an external water flushing and silting channel with a flow area gradually decreasing along the water flow direction is formed between the second cover body and the first cover body;

[0010] The top plate of the water inlet section of the second cover body is parallel to the connecting plate, the top plate heights of the acceleration section and the water outlet section of the second cover body gradually decrease along the water flow direction, and the tail of the first cover body corresponds to the acceleration section of the second cover body.

[0011] Optionally, the top plate of the water inlet section of the second cover body corresponds to the head of the first cover body;

[0012] The side plate of the water inlet section of the second cover body has a bevel, and the two ends of the bevel are respectively connected to the front edge of the top plate of the water inlet section of the second cover body and the rear edge of the top plate of the head of the first cover body.

[0013] Optionally, the side panels of the acceleration section of the second cover body gradually shrink inward along the direction of water flow.

[0014] Optionally, the height of the top plate of the tail portion of the first cover gradually decreases along the water flow direction;

[0015] The inclination angle of the top plate of the tail portion of the first cover body is smaller than the inclination angles of the top plates of the acceleration section and the water outlet section of the second cover body.

[0016] Optionally, the top plate heights of the acceleration section and the water outlet section of the second cover body and the top plate height of the tail portion of the first cover body both decrease linearly along the water flow direction.

[0017] Optionally, the second housing has a flat flow section between the water inlet section and the acceleration section;

[0018] The middle part is between the head and the tail of the first cover body;

[0019] The advection section corresponds to the middle part, and the top plate of the advection section and the middle part are parallel to the connecting plate.

[0020] Optionally, the connection plate, the first cover body and the second cover body are all made of plastic or thin copper plate, and the surfaces of the connection plate, the first cover body and the second cover body are coated with a coating that inhibits the growth of aquatic organisms.

[0021] Optionally, a first outlet is formed between the tail portion of the first cover body and the connecting plate, and a water outlet channel is formed between the first inlet and the first outlet;

[0022] The maximum height of the external water flushing and silting channel and the water outlet channel is 2-3 cm.

[0023] Optionally, the first inlet is circular;

[0024] The front end of the connecting plate corresponds to the head top plate of the first cover body, and the front end shape of the connecting plate is an arc shape corresponding to the first inlet.

[0025] Optionally, the connecting plate is further provided with a connecting hole for connecting to a one-way drainage channel.

[0026] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0027] The anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention discharges groundwater flowing out of the one-way drainage channel through the outlet channel of the first cover body. In addition, in the external water silt flushing channel with a gradually decreasing flow area formed between the second cover body and the first cover body, the water flow is accelerated in the external water silt flushing channel and impacts the silt at the total outlet, thereby preventing or controlling the siltation at the total outlet. When water flows out of the outlet channel, the water flow can also be accelerated and converged with the external water to impact the total outlet. The structure makes full use of the kinetic energy of the water flow in the channel and tunnel, accelerates the water flow through the variable cross-section configuration, and continuously flushes the internal channel of the structure and the first outlet at a high flow rate, so that the interior of the structure and the vicinity of the first outlet are not blocked, and the self-dredging function is achieved without the help of external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a three-dimensional diagram of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention;

[0030] Figure 2 is a top view of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention;

[0031] Figure 3 It is a bottom view of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention;

[0032] Figure 4 is a longitudinal cross-sectional view of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention;

[0033] Figure 5 This is one of the working principle diagrams of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention;

[0034] Figure 6 This is the second working principle diagram of an anti-clogging structure for a one-way drainage channel provided in an embodiment of the present invention.

[0035] Reference numerals:

[0036] 100, connecting plate; 200, first cover body; 300, second cover body;

[0037] 1. External water flushing and silt removal channel; 2. Water outlet channel; 3. Water inlet section; 4. Horizontal flow section; 5. Acceleration section; 6. Water outlet section; 7. Second inlet; 8. One-way drainage channel; 9. First inlet; 10. Connection hole; 11. First outlet; 12. Second outlet; 13. Main outlet. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0039] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0040] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0041] In the environment of channels and tunnels, groundwater refers to water existing in the pores and cracks of rocks or soil below the channel lining or tunnel sidewalls. The one-way drainage channel 8 is usually arranged at the bottom of the channel and below the lining plates on both sides or at the tunnel sidewalls.

[0042] An embodiment of the present invention provides an anti-clogging structure for a one-way drainage channel, which is arranged on the upper side of the one-way drainage channel 8 and can guide groundwater in the one-way drainage channel 8 to flow out from the anti-clogging structure.

[0043] Figure 1 It is a three-dimensional diagram of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention; Figure 2 is a top view of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention; Figure 3 It is a bottom view of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention; Figure 4 is a longitudinal cross-sectional view of an anti-clogging structure for a one-way drainage channel provided by an embodiment of the present invention, see Figures 1 to 4 The one-way drainage channel 8 only allows the fluid to flow out from the outlet but not to flow back, for example, a check valve.

[0044] The anti-clogging structure comprises: a connecting plate 100, a first cover 200 and a second cover 300. The connecting plate 100 is used to be arranged on the one-way drainage channel 8, the first cover 200 is buckled on the connecting plate 100, and the second cover 300 is buckled on the first cover 200.

[0045] Specifically, the connecting plate 100 has a first inlet 9 for connecting to the upper side of the one-way drainage channel 8. The outlet of the one-way drainage channel 8 corresponds to the first inlet 9, so that the groundwater flowing out of the outlet of the one-way drainage channel 8 can be discharged upward from the first inlet 9.

[0046] The first cover 200 is connected to the connecting plate 100 through the head top plate and the side plates, that is, the front and two side surfaces of the first cover 200 are connected to the connecting plate 100, and the unconnected part of the tail forms the first outlet 11, so the space between the first cover 200 and the connecting plate 100 can be used for drainage. In other words, a water outlet channel 2 is formed between the first inlet 9 and the first outlet 11 to discharge the groundwater flowing out of the one-way drainage channel 8.

[0047] The second cover body 300 is connected to the first cover body 200 through a side plate, and an external water flushing and silting channel 1 with a flow area gradually decreasing along the water flow direction is formed between the second cover body 300 and the first cover body 200. According to the principle of fluid continuity, when the flow rate remains unchanged, the flow rate is inversely proportional to the flow area. Therefore, the flow rate of the water flow in the acceleration section 5 and the water outlet section 6 continues to increase, forming a high-speed water flow. This high-speed water flow can produce a strong scouring force on impurities such as mud and sand entering the area, making it difficult for mud and sand to deposit in the acceleration section 5 and the water outlet section 6, thereby preventing siltation. Therefore, the water flow rate in the external water flushing and silting channel 1 is accelerated, which can impact the silt.

[0048] Specifically, a second inlet 7 is formed between the head of the second cover body 300 and the head of the first cover body 200, and a second outlet 12 is formed between the tail of the second cover body 300 and the tail of the first cover body 200. Moreover, the inclination angle of the top plate of the head of the first cover body 200 relative to the connecting plate 100 is between 15° and 75°, which is used to cooperate with the second cover body 300 to form a second inlet 7 shaped like a “>” and gradually reduce in height, so as to collect more water flow into the external water flushing and silting channel 1.

[0049] The external water refers to the water flow in the channel, tunnel or tunnel, which is usually in a flowing state. The device cleverly uses the driving force of the external water to impact without providing additional energy.

[0050] Among them, the top plate of the water inlet section 3 of the second cover body 300 is parallel to the connecting plate 100, which can reduce the resistance to the water flow. The top plate heights of the acceleration section 5 and the water outlet section 6 of the second cover body 300 gradually decrease along the direction of the water flow, which can change the direction of the water flow and increase the water flow speed, so that the water flow impacts obliquely downward at the second outlet 12. And the tail of the first cover body 200 corresponds to the acceleration section 5 of the second cover body 300, that is, the second outlet 12 is located on the upper side of the first outlet 11, and the water outlet direction of the external water flushing and silting channel 1 is inclined downward, so as to just impact the position of the total outlet 13. Moreover, the water outlet section 6 exceeds the tail of the first cover body 200, which further ensures that the water flow impacts the total outlet 13 obliquely downward at the second outlet 12.

[0051] The second cover 300 merges with the water flow in the lower water outlet channel 2 at the water outlet section 6 to impact the silt at the outlet of the anti-blocking structure. Therefore, the water flow in the external water silt flushing channel 1 is accelerated through the above-mentioned variable cross-section configuration, and the internal channel of the structure and the first outlet 11 and the second outlet 12 are continuously flushed at a high flow rate.

[0052] The acceleration section 5 geometrically shows a turning and contraction, so that the direction of the water flow entering the upper channel changes and the flow rate increases, and merges with the water flow in the outlet channel 2 at the outlet section 6, impacting the silt at the outlet of the anti-clogging structure, preventing the outlet from being blocked, and ensuring smooth drainage of the outlet channel 2.

[0053] By setting up an external water silt flushing channel 1 with a gradually decreasing flow area, the water flow in the channel or tunnel is utilized to increase its flow velocity after passing through the variable diameter channel, thereby impacting the silt at the total outlet 13, preventing the outlet from being blocked and ensuring smooth drainage; at the same time, it is ensured that there is water flow in the anti-siltation structure at all times to prevent sediment from entering therein, thereby realizing the self-silting function, extending the service life of the one-way drainage channel 8 and the anti-siltation structure, and greatly reducing the maintenance cost of drainage components and structures.

[0054] The present invention is connected with a one-way drainage channel 8 (such as a check valve) by bolts. After being installed on the bottom of the channel or the side wall of the tunnel, water flows from upstream to downstream through the present invention. When the groundwater level is normal or low, please refer to Figure 5 There is no water flow in the one-way drainage channel 8, and the lower outlet channel 2 is a static water flow. The water flow in the upper channel or tunnel enters the external water silt flushing channel 1 through the ">"-shaped water inlet, flows through the water inlet section 3 and the advection section 4, and then flows out from the outlet of the anti-siltation structure after the flow area is reduced and the flow velocity is increased in the acceleration section 5, and impacts the sediment at the total outlet 13; when the external water level is high, please refer to Figure 6 , water continues to flow out of the one-way drainage channel 8. The water flows through the lower outlet channel 2 and the upper channel or tunnel water flows through the upper acceleration section 5 and then merges at the outlet section 6, and flows out from the outlet of the anti-clogging structure together, forming a high flow rate area at the outlet to prevent fine particles from depositing, thereby ensuring smooth drainage of the one-way drainage channel 8.

[0055] The anti-clogging structure for a one-way drainage channel provided in an embodiment of the present invention discharges groundwater flowing out of the one-way drainage channel 8 through the outlet channel 2 of the first cover body 200. In addition, in the external water silt flushing channel 1 with a gradually decreasing flow area formed between the second cover body 300 and the first cover body 200, the water flow is accelerated in the external water silt flushing channel 1 and impacts the silt at the total outlet 13, thereby preventing or controlling the siltation at the total outlet 13. When water flows out of the outlet channel 2, the water flow can also be accelerated and converged with the external water to impact the total outlet 13. The structure makes full use of the kinetic energy of the water flow in the channel and tunnel, accelerates the water flow through the variable cross-section configuration, and continuously flushes the internal channel of the structure and the first outlet 11 at a high flow rate, so that the interior of the structure and the vicinity of the first outlet 11 are not blocked, and the self-dredging function is achieved without the help of external force.

[0056] In one embodiment provided by the present invention, the top plate of the water inlet section 3 of the second cover body 300 corresponds to the head of the first cover body 200; the side plate of the water inlet section 3 of the second cover body 300 has a bevel, and the two ends of the bevel are respectively connected to the front edge of the top plate of the water inlet section 3 of the second cover body 300 and the rear edge of the top plate of the head of the first cover body 200. Based on this structure, the side water flow can also flow into the second cover body 300 from the area between the bevel of the side plate and the top plate of the head of the first cover body 200, thereby gathering more water flow into the external water flushing and silting channel 1.

[0057] In one embodiment provided by the present invention, the side plates of the acceleration section 5 of the second cover body 300 gradually shrink inward along the water flow direction, further increasing the trend of reducing the flow area, and based on the external water hydraulic force, further increasing the speed of the water flow at this position.

[0058] Correspondingly, the tail side plate at the corresponding position of the first cover body 200 also gradually shrinks inward along the direction of the water flow, so that the flow area at the corresponding position also gradually decreases along the direction of the water flow. After the water flow is accelerated in the water outlet channel 2, it impacts the silt at the main outlet 13, which can prevent the first outlet 11 of the first cover body 200 from being blocked or flush out the blockage at the first outlet 11 to keep it unobstructed.

[0059] By setting up a water outlet channel 2 with a gradually decreasing flow area, groundwater is utilized to increase its flow velocity after passing through the variable diameter channel. Based on the hydraulic force of the groundwater, the silt at the total outlet 13 is impacted to prevent the outlet from being blocked, thereby ensuring smooth drainage and achieving a self-dredging function without the need for external force.

[0060] In one embodiment provided by the present invention, the height of the top plate at the rear of the first cover body 200 gradually decreases along the direction of the water flow, and the flow area at the corresponding position can also be gradually reduced along the direction of the water flow. After the water flow is accelerated in the water outlet channel 2, it impacts the silt at the total outlet 13, which can prevent the first outlet 11 of the first cover body 200 from being blocked or flush out the blockage at the first outlet 11 to keep it unobstructed. Moreover, the inclination angle of the top plate at the rear of the first cover body 200 is smaller than the inclination angle of the top plates of the acceleration section 5 and the water outlet section 6 of the second cover body 300, which can ensure that the flow direction of the water flow in the external water flushing and silting channel 1 is changed from horizontal to inclined downward, and can ensure that the water flowing out of the second outlet 12 of the external water flushing and silting channel 1 can impact the total outlet 13.

[0061] Furthermore, in an embodiment provided by the present invention, the top plate heights of the acceleration section 5 and the water outlet section 6 of the second cover body 300 and the tail top plate height of the first cover body 200 are both linearly reduced along the water flow direction, that is, the top plates of the acceleration section 5 and the water outlet section 6 are inclined planes, and it should be noted that the corresponding position of the connecting plate 100 is a horizontal plane. Therefore, this design makes the flow area gradually smaller when the water flows through this area, thereby realizing water flow acceleration, so as to achieve better drainage and anti-clogging effects.

[0062] Of course, the position may also decrease nonlinearly and can be set as needed.

[0063] In one embodiment provided by the present invention, the advection section 4 is between the water inlet section 3 and the acceleration section 5 of the second housing 300; the middle section is between the head and the tail of the first housing 200; the advection section 4 corresponds to the middle section, and the top plates of the advection section 4 and the middle section are parallel to the connecting plate 100. That is to say, in the advection section 4 and the middle section, the flow area and the water flow rate remain unchanged, which plays a role of transition and buffering, ensures the water inlet of the second inlet 7, and prevents water backflow.

[0064] In an embodiment provided by the present invention, the materials of the connecting plate 100, the first cover body 200 and the second cover body 300 are all plastic or thin copper plates, and the surface of the connecting plate 100, the first cover body 200 and the second cover body 300 is coated with a coating that inhibits the growth of aquatic organisms, which can effectively prevent the attachment and growth of organisms such as shell vegetables in the water, ensure the continuous flow of water in the anti-clogging structure, and greatly extend the service life of the one-way drainage channel 8 and the anti-clogging structure.

[0065] In an embodiment provided by the present invention, a first outlet 11 is formed between the tail of the first cover body 200 and the connecting plate 100, and a water outlet channel 2 is formed between the first inlet 9 and the first outlet 11; the maximum height of the external water flushing and silting channel 1 and the water outlet channel 2 is 2~3cm, and this size can be adapted to a variety of one-way drainage channels 8.

[0066] Furthermore, the connecting plate 100, the first cover body 200 and the second cover body 300 may be an integrally formed structure or assembled to form the device, which is not limited in this embodiment.

[0067] In one embodiment provided by the present invention, the first inlet 9 is circular and is adapted to the one-way drainage channel 8. The front end of the connecting plate 100 corresponds to the top plate of the head of the first cover body 200, and the front end shape of the connecting plate 100 is an arc shape corresponding to the first inlet 9, which can reduce the impact of external water on the device.

[0068] In an embodiment provided by the present invention, a connection hole 10 is further provided on the connection plate 100 for connecting the one-way drainage channel 8. Specifically, the lower portion of the water outlet channel 2 is the water outlet of the one-way drainage channel 8, a circular hole is provided in the middle of the connection plate 100, and bolt holes are provided around it, which are aligned with the bolt holes around the top of the one-way drainage channel 8, and the one-way drainage channel 8 is connected to the anti-clogging structure through bolts.

[0069] The present invention can be adapted to one-way drainage components such as check valves of different types and models, and is convenient to install and replace. Furthermore, a sealing ring can be installed on the bolts at the connection to improve the sealing effect.

[0070] The anti-clogging structure for a one-way drainage channel provided in an embodiment of the present invention discharges groundwater flowing out of the one-way drainage channel 8 through the outlet channel 2 of the first cover body 200. In addition, in the external water silt flushing channel 1 with a gradually decreasing flow area formed between the second cover body 300 and the first cover body 200, the water flow is accelerated in the external water silt flushing channel 1 and impacts the silt at the total outlet 13, thereby preventing or controlling the siltation at the total outlet 13. When water flows out of the outlet channel 2, the water flow can also be accelerated and converged with the external water to impact the total outlet 13. The structure makes full use of the kinetic energy of the water flow in the channel and tunnel, accelerates the water flow through the variable cross-section configuration, and continuously flushes the internal channel of the structure and the first outlet 11 at a high flow rate, so that the interior of the structure and the vicinity of the first outlet 11 are not blocked, and the self-dredging function is achieved without the help of external force.

[0071] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding.

[0072] In the present invention, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0073] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An anti-clogging structure for a one-way drainage channel, characterized in that: The structure comprises: a connecting plate, a first cover body and a second cover body; The connecting plate is provided with a first inlet for communicating with the upper side of the one-way drainage channel; The first cover body is connected to the connecting plate through a head top plate and side plates, and the inclination angle of the head top plate of the first cover body relative to the connecting plate is between 15° and 75°; The second cover body is connected to the first cover body through a side plate, and an external water flushing and silting channel with a flow area gradually decreasing along the water flow direction is formed between the second cover body and the first cover body; The top plate of the water inlet section of the second cover body is parallel to the connecting plate, the top plate heights of the acceleration section and the water outlet section of the second cover body gradually decrease along the water flow direction, and the tail of the first cover body corresponds to the acceleration section of the second cover body.

2. The anti-clogging structure for a one-way drainage channel according to claim 1, characterized in that: The top plate of the water inlet section of the second cover body corresponds to the head of the first cover body; The side plate of the water inlet section of the second cover body has a bevel, and the two ends of the bevel are respectively connected to the front edge of the top plate of the water inlet section of the second cover body and the rear edge of the top plate of the head of the first cover body.

3. The anti-clogging structure for a one-way drainage channel according to claim 1, characterized in that: The side plates of the acceleration section of the second cover body gradually shrink inwards along the water flow direction.

4. The anti-clogging structure for a one-way drainage channel according to claim 1, characterized in that: The height of the top plate at the rear of the first cover gradually decreases along the water flow direction; The inclination angle of the top plate of the tail portion of the first cover body is smaller than the inclination angles of the top plates of the acceleration section and the water outlet section of the second cover body.

5. The anti-clogging structure for a one-way drainage channel according to claim 4, characterized in that: The top plate heights of the acceleration section and the water outlet section of the second cover body and the top plate height of the tail portion of the first cover body both decrease linearly along the water flow direction.

6. The anti-clogging structure for a one-way drainage channel according to claim 1, characterized in that: The advection section is between the water inlet section and the acceleration section of the second housing; The middle part is between the head and the tail of the first cover body; The advection section corresponds to the middle part, and the top plate of the advection section and the middle part are parallel to the connecting plate.

7. The anti-clogging structure for a one-way drainage channel according to claim 1, characterized in that: The connecting plate, the first cover body and the second cover body are all made of plastic or thin copper plates, and the surfaces of the connecting plate, the first cover body and the second cover body are coated with a coating that inhibits the growth of aquatic organisms.

8. The anti-clogging structure for a one-way drainage channel according to claim 1, characterized in that: A first outlet is formed between the tail portion of the first cover body and the connecting plate, and a water outlet channel is formed between the first inlet and the first outlet; The maximum height of the external water flushing and silting channel and the water outlet channel is 2-3 cm.

9. The anti-clogging structure for a one-way drainage channel according to claim 1, characterized in that: The first inlet is circular; The front end of the connecting plate corresponds to the head top plate of the first cover body, and the front end shape of the connecting plate is an arc shape corresponding to the first inlet.

10. The anti-clogging structure for a one-way drainage channel according to claim 1, characterized in that: The connecting plate is also provided with a connecting hole for connecting to a one-way drainage channel.

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