Artificial wetland sample inlet speed automatic adjusting device and its application artificial wetland

Abstract

The utility model relates to the field of artificial wetland discloses a kind of artificial wetland sample introduction speed automatic regulating device and the artificial wetland of its application, the sample introduction speed automatic regulating device includes sleeve, sleeve interior space has one-way opening;Piston is slidably arranged in sleeve interior, and the one-way opening side far from piston in sleeve interior space is sealed cavity;Guide piece is fixedly connected in sleeve side wall, and guide piece is internally provided with guide space, and guide space is communicated with sleeve interior space;Connecting rod part is located in guide space, and one end of connecting rod is fixed with piston, and the end of connecting rod far from the piston extends to outside guide space;Baffle is fixedly connected to the end of connecting rod far from piston, and sample introduction speed is automatically regulated based on water level condition in artificial wetland, and sample introduction speed and water level in artificial wetland are reverse relationship, and sample introduction speed is quickly and accurately regulated, and water sample capacity overflow risk is reduced, and the operating efficiency and stability of artificial wetland are improved, and ideal purification effect is ensured.

Description

Technical Field

[0001] This utility model relates to the field of constructed wetlands, specifically to an automatic adjustment device for the sampling speed of constructed wetlands and its application in constructed wetlands. Background Technology

[0002] Constructed wetlands are ecological engineering technologies that use artificially constructed and controlled wetland-like surfaces to treat wastewater and sludge. Their working principle involves the controlled introduction of wastewater and sludge onto the constructed wetland. As the wastewater and sludge flow in a specific direction, the physical, chemical, and biological processes of soil, artificial media, plants, and microorganisms are utilized to treat the wastewater and sludge. Specific mechanisms include adsorption, retention, filtration, oxidation-reduction, sedimentation, microbial decomposition, transformation, plant shading, residue accumulation, transpiration and nutrient absorption, as well as the actions of various animals. After purification by the constructed wetland, the purified water sample is discharged through drainage pipes so that the constructed wetland can receive water samples for further treatment.

[0003] To ensure the purification effect of constructed wetlands, the water sample volume needs to be strictly controlled. Existing methods for controlling water sample volume mainly involve directly adjusting the valve opening on the inlet pipe or adjusting the speed of the variable frequency pump to control the wastewater injection rate, thereby ensuring the constructed wetland is at an appropriate water sample volume. However, these existing methods of adjusting the injection rate have significant shortcomings. Specifically, the adjustment feedback speed is slow and cannot respond promptly to changes in the water sample volume in the wetland. This leads to the risk of overflow due to excessive water sample volume during actual operation. Such overflow not only reduces the purification effect of the wetland but may also cause secondary pollution to the surrounding environment, seriously affecting the stable operation and ecological benefits of the constructed wetland system.

[0004] Therefore, there is an urgent need for an artificial wetland sampling control system that can quickly and accurately adjust the sampling speed and effectively avoid the risk of overflow due to excessive water sample volume, so as to improve the operating efficiency and stability of artificial wetlands, ensure their stable operation under various working conditions, and achieve the ideal purification effect. Utility Model Content

[0005] The purpose of this invention is to overcome the problem of slow feedback in the adjustment of the sampling speed in constructed wetlands in the existing technology, and to provide an automatic adjustment device for the sampling speed in constructed wetlands. This automatic adjustment device can automatically adjust the sewage sampling speed based on the water level in the constructed wetland.

[0006] To achieve the above objectives, the first aspect of this utility model provides an automatic adjustment device for the sampling rate of an artificial wetland, comprising:

[0007] A sleeve, wherein the internal space of the sleeve has a one-way opening;

[0008] A piston is slidably disposed inside the sleeve, and the internal space of the sleeve has a sealed cavity on the side of the piston away from the opening.

[0009] A guide component is fixedly connected to the side wall of the sleeve, and a guide space is provided inside the guide component, which is connected to the internal space of the sleeve.

[0010] A connecting rod, wherein the connecting rod portion is located within the guide space and one end of the connecting rod is fixed to the piston, and the end of the connecting rod away from the piston extends out of the guide space;

[0011] A baffle, the baffle being fixedly connected to the end of the connecting rod away from the piston;

[0012] The guide space is kept isolated from the sealing cavity and the opening of the sleeve.

[0013] In some embodiments, the piston includes a first sealing plug, a piston rod, and a second sealing plug, the second sealing plug being located on the side of the first sealing plug away from the sleeve opening, the piston rod being fixedly connected between the first sealing plug and the second sealing plug, and the connecting rod being fixedly connected to the piston rod.

[0014] In some embodiments, the connecting rod includes a horizontal bar and a vertical bar, one end of the horizontal bar is fixedly connected to the piston and the other end is fixedly connected to one end of the vertical bar, and the end of the vertical bar away from the horizontal bar is fixedly connected to the baffle.

[0015] Wherein, the extension direction of the crossbar is perpendicular to the sliding direction of the piston, and the extension direction of the vertical rod is parallel to the sliding direction of the piston.

[0016] In some embodiments, the automatic injection speed adjustment device further includes a column, and the baffle is slidably connected to the column.

[0017] In some embodiments, the column has a guide strip, and the baffle has a guide groove for slidingly engaging the guide strip.

[0018] In some embodiments, the extension direction of the guide strip and the guide groove is perpendicular to the surface of the baffle.

[0019] The second aspect of this utility model provides an artificial wetland, including a retaining structure, a sewage pipe, and an automatic sampling speed adjustment device as described above. The bottom of the wetland area enclosed by the retaining structure is provided with an impermeable layer. The sleeve is fixedly installed in the impermeable layer in a vertical state with the opening facing upward. The lower end of the sleeve extends into the soil layer below the impermeable layer, and the guide is buried in the soil layer below the impermeable layer. The end of the connecting rod away from the piston extends to the guide and the soil layer and is fixedly connected to the baffle.

[0020] In some embodiments, there is a height difference between the upper end of the sleeve and the impermeable layer.

[0021] In some embodiments, the connecting rod is offset from the outlet of the sewage pipe when projected along the sewage discharge direction of the sewage pipe.

[0022] In some embodiments, a connecting pipe is connected to the outlet of the sewage pipe, the connecting pipe is parallel to the sewage pipe, the baffle is used to block and adjust the opening of the connecting pipe on the side away from the sewage pipe, and a branch pipe is connected to the connecting pipe, the branch pipe being perpendicular to the connecting pipe.

[0023] The artificial wetland sampling speed automatic adjustment device and its application in artificial wetlands, which utilizes the above-mentioned technical solution of this utility model, have the following effects:

[0024] In the automatic sample injection rate adjustment device, a piston and sleeve structure is used to obtain the water level in the constructed wetland. The higher the water level, the greater the water pressure on the piston, thus reflecting the larger the water volume in the constructed wetland. Under water pressure, the piston slides within the sleeve, thereby moving a baffle via a connecting rod and adjusting the opening of the wastewater pipe outlet, thus regulating the sample injection rate. The automatic adjustment of the sample injection rate based on the water level in the constructed wetland, which is inversely related to the water level, allows for rapid and accurate adjustment, reducing the risk of overflow due to excessive water sample volume, improving the operational efficiency and stability of the constructed wetland, and ensuring the achievement of ideal purification results.

[0025] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an automatic sampling speed adjustment device for artificial wetlands according to one embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Top sectional view of the junction of the middle sleeve and the guide component;

[0028] Figure 3This is a schematic diagram of the structure of an automatic sampling speed adjustment device for artificial wetlands according to another embodiment of the present invention;

[0029] Figure 4 yes Figure 2 Top sectional view of the junction of the middle sleeve and the guide component;

[0030] Figure 5 This is a top view of the structure at the baffle and column;

[0031] Figure 6 This is a schematic diagram of the structure of an artificial wetland under low water level according to one embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of an artificial wetland at the middle water level according to one embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of an artificial wetland under high water level according to one embodiment of the present invention;

[0034] Figure 9 This is a side view diagram of the baffle and the sewage outlet when the sewage outlet is in a fully open state.

[0035] Figure 10 This is a side view diagram of the baffle and the sewage outlet when the sewage outlet is in a partially open state.

[0036] Figure 11 This is a side view of the baffle and column when the sewage outlet is completely closed.

[0037] Figure 12 This is a schematic diagram of an artificial wetland structure with connecting pipes and branch pipes according to one embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures

[0039] 1. Enclosure structure; 2. Impermeable layer; 3. Soil layer; 4. Sleeve; 4a. Sealing cavity; 5. Piston; 5a. First sealing plug; 5b. Piston rod; 5c. Second sealing plug; 6. Guide component; 7. Guide space; 8. Connecting rod; 8a. Horizontal bar; 8b. Vertical bar; 9. Baffle; 9a. Guide groove; 10. Column; 10a. Guide strip; 11. Connecting pipe; 12. Branch pipe; 13. Sewage pipe; 14. Water surface. Detailed Implementation

[0040] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0041] The first aspect of this utility model provides an automatic adjustment device for the sampling speed of an artificial wetland, as shown in the attached figure. Figure 1 Appendix Figure 2 As shown, the automatic injection speed adjustment device includes a sleeve 4, a piston 5, a guide member 6, a connecting rod 8, and a baffle 9. The internal space of the sleeve 4 has a one-way opening, that is, one side of the sleeve 4 is closed and the other side is open. The piston 5 is slidably disposed inside the sleeve 4, and the side of the internal space of the sleeve 4 away from the opening of the piston 5 is a sealed cavity 4a. The guide member 6 is fixedly connected to the side wall of the sleeve 4, and a guide space 7 is formed inside the guide member 6, which is connected to the internal space of the sleeve 4. The connecting rod 8 is partially located in the guide space 7, and one end of the connecting rod 8 is fixed to the piston 5. The end of the connecting rod 8 away from the piston 5 extends to the outside of the guide space 7, and the baffle 9 is fixedly connected to the end of the connecting rod 8 away from the piston 5.

[0042] Combined with appendix Figure 1 Appendix Figure 2 As shown, the pressure applied to the piston 5 at the opening of the sleeve 4 drives the piston 5 to slide towards the inside of the sleeve 4 and compress the sealing cavity 4a, thereby increasing the pressure inside the sealing cavity 4a until the internal and external pressures on the piston 5 reach equilibrium. At the same time, the piston 5 moves synchronously through the connecting rod 8 to drive the baffle 9 to move.

[0043] In practical applications, the pressure applied to the piston 5 at the opening of the sleeve 4 is the water pressure in the constructed wetland. The higher the water level in the constructed wetland, the greater the water pressure on the piston 5, the longer the piston 5 slides downward, and the longer the baffle 9 moves downward. Therefore, the moving distance of the baffle 9 is positively correlated with the water level of the constructed wetland. The downward movement of the baffle 9 is used to block and adjust the opening of the sewage pipe 13 outlet. The greater the moving distance of the baffle 9, the smaller the opening of the sewage pipe 13 outlet. The opening of the sewage pipe 13 outlet is positively correlated with the feed rate. Therefore, the movement of the baffle 9 achieves automatic adjustment of the feed rate, quickly and accurately adjusting the sample injection speed, reducing the risk of overflow due to excessive water sample volume, improving the operating efficiency and stability of the constructed wetland, and ensuring the achievement of the ideal purification effect.

[0044] It is important to note that the guide space 7 and the sealing cavity 4a are kept in an isolated state to prevent pressure release during the pressure increase in the sealing cavity 4a, which would cause the pressure inside the sealing cavity 4a to be out of balance with the pressure applied to the piston 5 at the opening of the sleeve 4. The guide space 7 and the opening of the sleeve 4 are also kept in an isolated state to prevent water in the artificial wetland from leaking from inside the sleeve 4 into the guide space 7.

[0045] In addition, the baffle 9, which blocks the outlet of the sewage pipe 13 from top to bottom, serves two main purposes. First, when sewage flows from the opening of the sewage pipe 13 into the constructed wetland, the sewage stream follows a downward parabolic trajectory. The baffle 9, blocking the outlet of the sewage pipe 13 from top to bottom, maintains the parabolic trajectory of the sewage while adjusting the injection speed, reducing sewage splashing. Second, it facilitates maintenance of the baffle 9 while ensuring smooth sewage flow in the sewage pipe 13, preventing interference with the injection into the constructed wetland.

[0046] In some preferred embodiments, combined with appendix Figure 3 and attached Figure 4 As shown, piston 5 includes a first sealing plug 5a, piston rod 5b, and a second sealing plug 5c. The second sealing plug 5c is located on the side of the first sealing plug 5a away from the opening of the sleeve 4. Piston rod 5b is fixedly connected between the first sealing plug 5a and the second sealing plug 5c, and connecting rod 8 is fixedly connected to piston rod 5b. The first sealing plug 5a is located at the opening of the sleeve 4, mainly serving to withstand water pressure and prevent water leakage from the opening of the sleeve 4. The second sealing plug 5c is located at the bottom inside the sleeve 4, used to separate a sealing cavity 4a inside the sleeve 4. Piston rod 5b is used to link the first sealing plug 5a and the second sealing plug 5c, and also serves as a component connected to connecting rod 8. Furthermore, the diameter of piston rod 5b is generally smaller than the diameters of the first sealing plug 5a, the second sealing plug 5c, and the inner diameter of the sleeve 4. Therefore, piston rod 5b does not contact the inner wall of the sleeve 4. Piston 5 slides with sleeve 4 through the first sealing plug 5a and the second sealing plug 5c, reducing the contact area and sliding friction. This design also reduces the material used in piston 5, saving costs.

[0047] In this embodiment, during the sliding process of the piston 5, the guide space 7 always maintains communication only with the internal space of the sleeve 4 between the first sealing plug 5a and the second sealing plug 5c. This can also prevent water in the artificial wetland from leaking into the guide space 7 and will not cause the sealing cavity 4a to depressurize.

[0048] In some preferred embodiments, combined with appendix Figure 1 and attached Figure 3 As shown, the connecting rod 8 includes a horizontal rod 8a and a vertical rod 8b. One end of the horizontal rod 8a is fixedly connected to the piston 5, and the other end is fixedly connected to one end of the vertical rod 8b. The end of the vertical rod 8b away from the horizontal rod 8a is fixedly connected to the baffle 9. The extension direction of the horizontal rod 8a is perpendicular to the sliding direction of the piston 5, and the extension direction of the vertical rod 8b is parallel to the sliding direction of the piston 5.

[0049] Sleeve 4 and piston 5 are used to reflect the water level in the constructed wetland, therefore sleeve 4 and piston 5 are generally placed in the water of the constructed wetland. The wastewater pipe 13, used for sample inlet and outlet, is generally located on the periphery of the constructed wetland, and the baffle 9, used to block and adjust the outlet opening of the wastewater pipe 13, should be located near the wastewater pipe 13. Therefore, the connecting rod 8 adopts a combination of horizontal rod 8a and vertical rod 8b to satisfy the linkage between the baffle 9 and piston 5, which have positional differences in the horizontal and vertical directions.

[0050] In some preferred embodiments, combined with appendix Figure 1 and attached Figure 3 As shown, the automatic injection speed adjustment device also includes a column 10, with a baffle 9 slidably connected to the column 10. The sliding connection between the column 10 and the baffle 9 improves the stability of the baffle 9 during the sliding adjustment process. In actual use, the column 10 can be fixed to the ground to ensure the stability of both the column 10 and the baffle 9.

[0051] In some preferred embodiments, combined with appendix Figure 1 Appendix Figure 3 and appendix Figure 5 As shown, the column 10 has a guide strip 10a, and the baffle 9 has a guide groove for sliding engagement with the guide strip 10a. The sliding engagement between the guide strip 10a and the guide groove further improves the sliding stability of the baffle 9.

[0052] In some preferred embodiments, combined with appendix Figure 1 Appendix Figure 3 and appendix Figure 5 As shown, the extension direction of the guide strip 10a and the guide groove is perpendicular to the surface of the baffle 9. When the baffle 9 blocks the outlet of the regulating sewage pipe 13, the surface of the baffle 9 will bear the sewage sampling pressure discharged from the sewage pipe 13, which may easily cause the baffle 9 to tip over and fail to achieve the purpose of blocking and regulating the sampling speed of the sewage pipe 13. In this embodiment, the baffle 9 releases the sewage sampling pressure to the column 10 through the guide strip 10a and the guide groove, improving the stability of the baffle 9 when blocking the outlet of the sewage pipe 13, thereby ensuring the sealing of the baffle 9 when blocking and achieving the purpose of regulating the sampling speed of the sewage pipe 13.

[0053] A second aspect of the present invention also provides an artificial wetland, combined with attached Figure 6 As shown, the constructed wetland includes a retaining structure 1, a sewage pipe 13, and an automatic sample injection speed adjustment device as described in any of the above embodiments. A seepage-proof layer 2 is provided at the bottom of the wetland area enclosed by the retaining structure 1. A sleeve 4 is fixedly installed vertically with its opening facing upwards in the seepage-proof layer 2. The lower end of the sleeve 4 extends into the soil layer 3 below the seepage-proof layer 2, and a guide 6 is buried in the soil layer 3 below the seepage-proof layer 2. The end of the connecting rod 8 away from the movable end extends above the guide 6 and the soil layer 3 and is fixedly connected to a baffle 9.

[0054] The retaining structure 1 of an artificial wetland is generally constructed using cement and concrete. The bottom of the wetland area enclosed by the retaining structure 1 must meet the seepage prevention requirements of the wetland type by setting up a seepage-proof layer 2. The materials of the seepage-proof layer 2 include, but are not limited to, clay layer 3, geomembrane, concrete, etc.

[0055] The sleeve 4 is fixed vertically with its opening facing upwards. The opening of the sleeve 4 is located in the wetland area, allowing the piston 5 inside the sleeve 4 to receive water pressure. Simultaneously, the linked connecting rod 8 and baffle 9 move vertically, with the baffle 9 moving vertically to block the opening of the sewage pipe 13 outlet. The guide member 6 is embedded in the soil layer 3 below the impermeable layer 2. The guide space 7 inside the guide member 6 provides space for the connecting rod 8 to move and prevents soil and gravel in the soil layer 3 from interfering with the movement of the connecting rod 8 and affecting the sample injection adjustment effect.

[0056] In some preferred embodiments, as shown in the appendix Figure 6 Appendix Figure 7 and appendix Figure 8 As shown, there is a height difference between the upper end of the sleeve 4 and the impermeable layer 2, ensuring that the constructed wetland has a certain water storage capacity. Specifically, in conjunction with the attached... Figure 6 and attached Figure 9 When the water level 14 in the constructed wetland is lower than the upper end of the casing, the water level 14 is at a low water level, and the piston 5 is not under water pressure, so the piston 5 is in its upper limit position inside the casing. Similarly, the baffle 9 is also in its upper limit position, and the outlet of the sewage pipe 13 is fully open. The sewage pipe 13 can inject samples into the constructed wetland at maximum speed. Therefore, when the water level 14 in the constructed wetland is lower than the upper end of the casing, the injection speed is adjusted to the maximum, and the baffle 9 does not block the outlet of the sewage pipe 13, ensuring that the sewage pipe 13 can inject samples into the constructed wetland and preventing the constructed wetland from drying out due to low water level.

[0057] In addition, combined with the appendix Figure 7 and attached Figure 10 When the water level 14 in the constructed wetland is higher than the upper end of the casing, the water level 14 is at a mid-water level. The piston 5 is subjected to water pressure and slides downwards until the pressure exerted on the piston 5 by the sealing cavity 4a is balanced with the pressure exerted on the piston 5 by the water. At this time, the baffle 9 partially blocks the outlet of the sewage pipe 13, reducing the sampling speed of the sewage pipe 13 into the constructed wetland. Furthermore, the higher the water level 14 in the constructed wetland, the larger the area of ​​the sewage pipe 13 outlet blocked by the baffle 9, and the slower the sampling speed of the sewage pipe 13 into the constructed wetland, until the sampling speed is zero.

[0058] Combined with appendix Figure 8 and attached Figure 11The water level 14 in the constructed wetland is higher than the upper end of the casing and reaches a certain water level, so that the baffle 9 completely blocks the outlet of the sewage pipe 13, making the sampling speed of the sewage pipe 13 into the constructed wetland zero, avoiding the continued sampling into the constructed wetland, and reducing the risk of overflow due to excessive water sample volume.

[0059] In some preferred embodiments, combined with appendix Figure 9 Appendix Figure 10 and appendix Figure 11 As shown, projected along the discharge direction of the sewage pipe 13, the connecting rod 8 is offset from the outlet of the sewage pipe 13 to prevent the connecting rod 8 from infecting the sewage pipe 13 and causing it to discharge into the constructed wetland.

[0060] In some preferred embodiments, combined with appendix Figure 12 As shown, a connecting pipe 11 is connected to the outlet of the sewage pipe 13. The connecting pipe 11 is parallel to the sewage pipe 13. The baffle 9 is used to block the opening of the connecting pipe 11 on the side away from the sewage pipe 13. A branch pipe 12 is connected to the connecting pipe 11. The branch pipe 12 is perpendicular to the connecting pipe 11.

[0061] When the baffle 9 does not block the opening of the connecting pipe 11, most of the wastewater discharged from the sewage pipe 13 is introduced into the constructed wetland through the connecting pipe 11. When the baffle 9 partially blocks the opening of the connecting pipe 11, some of the wastewater discharged from the sewage pipe 13 is introduced into the constructed wetland through the connecting pipe 11, while the other part is discharged into other wastewater treatment systems through the branch pipe 12. When the baffle 9 completely blocks the opening of the connecting pipe 11, all the wastewater discharged from the sewage pipe 13 is discharged into other wastewater treatment systems through the branch pipe 12. These other wastewater treatment systems include, but are not limited to, wastewater treatment plants and other constructed wetlands.

[0062] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0063] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0064] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. An automatic adjustment device for sample introduction speed in an artificial wetland, characterized in that, include: Sleeve (4), the internal space of which has a one-way opening; Piston (5), the piston (5) is slidably disposed inside the sleeve (4), and the inner space of the sleeve (4) is a sealed cavity (4a) on the side of the piston (5) away from the opening. Guide (6), the guide (6) is fixedly connected to the side wall of the sleeve (4), and a guide space (7) is provided in the guide (6), the guide space (7) is connected to the internal space of the sleeve (4); A connecting rod (8) is located within the guide space (7) and one end of the connecting rod (8) is fixed to the piston (5). The end of the connecting rod (8) away from the piston (5) extends out of the guide space (7). Baffle (9), the baffle (9) is fixedly connected to the end of the connecting rod (8) away from the piston (5); The guide space (7) is kept isolated from the sealing cavity (4a) and the opening of the sleeve (4).

2. The automatic adjustment device for sample introduction speed in constructed wetlands according to claim 1, characterized in that, The piston (5) includes a first sealing plug (5a), a piston rod (5b), and a second sealing plug (5c). The second sealing plug (5c) is located on the side of the first sealing plug (5a) away from the opening of the sleeve (4). The piston rod (5b) is fixedly connected between the first sealing plug (5a) and the second sealing plug (5c). The connecting rod (8) is fixedly connected to the piston rod (5b).

3. The automatic adjustment device for sample introduction speed in constructed wetlands according to claim 1, characterized in that, The connecting rod (8) includes a horizontal rod (8a) and a vertical rod (8b). One end of the horizontal rod (8a) is fixedly connected to the piston (5) and the other end is fixedly connected to one end of the vertical rod (8b). The end of the vertical rod (8b) away from the horizontal rod (8a) is fixedly connected to the baffle (9). The horizontal bar (8a) extends in a direction perpendicular to the sliding direction of the piston (5), and the vertical bar (8b) extends in a direction parallel to the sliding direction of the piston (5).

4. The automatic adjustment device for sample introduction speed in constructed wetlands according to any one of claims 1 to 3, characterized in that, The automatic injection speed adjustment device also includes a column (10), and the baffle (9) is slidably connected to the column (10).

5. The automatic adjustment device for sample introduction speed in constructed wetlands according to claim 4, characterized in that, The column (10) has a guide strip (10a), and the baffle (9) has a guide groove for sliding cooperation with the guide strip (10a).

6. The automatic adjustment device for sample introduction speed in constructed wetlands according to claim 5, characterized in that, The extension direction of the guide strip (10a) and the guide groove is perpendicular to the surface of the baffle (9).

7. An artificial wetland, characterized in that, The device includes a retaining structure (1), a sewage pipe (13), and an automatic sampling speed adjustment device as described in any one of claims 1 to 6. The bottom of the wetland area enclosed by the retaining structure (1) is provided with an impermeable layer (2). The sleeve (4) is fixedly installed in the impermeable layer (2) with its opening facing upward in a vertical state. The lower end of the sleeve (4) extends into the soil layer (3) below the impermeable layer (2), and the guide (6) is buried in the soil layer (3) below the impermeable layer (2). The end of the connecting rod (8) away from the piston (5) extends to the guide (6) and the soil layer (3) and is fixedly connected to the baffle (9).

8. The constructed wetland according to claim 7, characterized in that, There is a height difference between the upper end of the sleeve (4) and the impermeable layer (2).

9. The constructed wetland according to claim 7, characterized in that, Projected along the discharge direction of the sewage pipe (13), the connecting rod (8) is offset from the outlet of the sewage pipe (13).

10. The constructed wetland according to any one of claims 7 to 9, characterized in that, The outlet of the sewage pipe (13) is connected to a connecting pipe (11), which is parallel to the sewage pipe (13). The baffle (9) is used to block and adjust the opening of the connecting pipe (11) on the side away from the sewage pipe (13). A branch pipe (12) is connected to the connecting pipe (11), which is perpendicular to the connecting pipe (11).

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