Sealed recharge well lid capable of being lifted back

Abstract

The invention discloses a sealed recharge well lid capable of being lifted back, and relates to the field of geotechnical engineering and underground water control, the sealed recharge well lid comprises a well seat main body, the well seat main body is of a hollow cylindrical structure, the lower end of the well seat main body is provided with a foundation flange used for being fixed with a well casing of a recharge well, and the top of the well seat main body is provided with a detachably connected functional cover plate; a lifting pipeline vertically extending into the well seat main body is arranged on the functional cover plate, a flange connecting piece is arranged at the bottom of the lifting pipeline, and the flange connecting piece is connected with a flange plate at a water outlet of the lifting pump through a fastener; the well cover, the recharge channel and the recharge channel are mutually independent, the lifting pump is started and operated through the top connector to conduct well washing operation, the two modes can be conducted at the same time and do not interfere with each other, continuity and stability of underground water control are guaranteed, and the well washing efficiency is improved. And the maintenance efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to geotechnical engineering and groundwater control technology, specifically to a sealed, rechargeable manhole cover. Background Technology

[0002] In deep foundation pit dewatering projects, to ensure the safety of foundation pit excavation and prevent the settlement of the surrounding environment, a groundwater control method combining pumping and recharge is often adopted. The recharge well is a key facility for re-injecting the pumped groundwater back into the target aquifer. Currently, the wellhead device of the recharge well mostly adopts a single pipe interface, and the function is switched through a valve group: when recharge is needed, the pipeline connected to the backflow pump is closed and the valve of the recharge pipeline is opened; when backflow and well flushing are needed, the opposite operation is performed. This single-pipe switching mode is theoretically feasible, but in actual engineering applications, especially in soil layers with high sand content or prone to chemical precipitation, the valve and pipeline switching nodes are very easy to be blocked, resulting in switching failure, and maintenance and cleaning work is cumbersome and time-consuming.

[0003] Furthermore, traditional manhole cover devices cannot perform recharge and lift operations simultaneously. Recharge must be stopped during well cleaning and maintenance, which affects the stable control of the groundwater level. At the same time, lift pumps are usually directly attached to the well pipe through simple quick connectors or hoses. During high-pressure lift operations, the pump pipe connection is very prone to loosening and falling off due to pressure fluctuations, or leakage may occur. This not only results in low pumping efficiency but also splashes high-pressure water into the foundation pit, deteriorating the construction environment and posing safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide a sealed, rechargeable manhole cover to solve the problem that traditional recharge manhole covers in the prior art cannot achieve simultaneous recharge and recharge operations.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealed rechargeable well cover, comprising a well base body, the well base body being a hollow cylindrical structure, the lower end of the well base body being provided with a base flange for fixing to the recharge well pipe, the top of the well base body being provided with a detachable functional cover plate, the functional cover plate being provided with a recharge pipe extending vertically into the well base body, the bottom of the recharge pipe being provided with a flange connecting piece, the flange connecting piece being connected to the flange of the recharge pump outlet by fasteners;

[0006] It also includes a lateral recharge pipe, which is fixedly installed on the side wall of the well base body. The central axis of the lateral recharge pipe is not parallel to the central axis of the well base body, forming a dedicated high-flow recharge channel.

[0007] The well base body is equipped with a built-in filter module, which is located in the internal cavity of the well base body and below the inner opening of the lateral reinjection pipe.

[0008] Furthermore, the main body of the well base, the functional cover plate, the return pipe and the lateral recharge pipe are all made of metal materials and the surface is treated with anti-corrosion. The bottom of the base flange is provided with an overlapping ring that is clamped to the wellhead of the recharge well. The central axis of the lateral recharge pipe is perpendicular to the central axis of the main body of the well base.

[0009] Furthermore, the diameter of the lateral reinjection pipe is not less than DN100, the functional cover plate is also provided with a control valve, the bottom of the functional cover plate is provided with annularly distributed docking plates, the vertical cross-sectional profile of the docking plates is "L" shaped, the docking plates are provided with arc-shaped bayonets facing outward, the ends of the transverse section profile of the docking plates are provided with sealing strips, and each docking plate is provided with a stop block on the side wall along the same direction.

[0010] Furthermore, the well base body has annularly spaced positioning plates inside, the cross-sectional profile of the positioning plates is arc-shaped, the center of the positioning plates is the same as the center of the functional cover plate, the outer wall of the functional cover plate has a vertically downward sealing ring, the outer wall of the sealing ring has annularly distributed positioning screws, when the functional cover plate is installed with the well base body, the docking plate is located between the two positioning plates, the functional cover plate rotates to make the arc-shaped locking mouth cooperate with the docking plate.

[0011] Furthermore, the top of the return pipe is also provided with the same flange connection piece. A conveying pipe is installed inside the return pipe. The outer wall of the conveying pipe and the inner wall of the return pipe are mutually matched. A butt flange is welded on the outer wall of the conveying pipe. The butt flange and the flange connection piece are mutually matched. A retaining ring is provided at the bottom of the butt flange and on the outer wall of the conveying pipe. The vertical cross-sectional profile of the retaining ring is "T".

[0012] Furthermore, the conveying pipe extends downward through the retaining ring, and a threaded locking part is provided on the outer wall of the vertical section of the retaining ring. After the conveying pipe is inserted into the return pipe, the threaded locking part cooperates with the internal thread on the inner wall of the return pipe. A flow meter is also provided on the return pipe, and the probe of the flow meter extends into the conveying pipe.

[0013] Furthermore, the built-in filter module includes a bracket, a filter mounting ring, and a filter. The bracket has an annular cross-sectional profile and is welded to the inner wall of the well base body. The bracket is located below the outlet of the lateral reinjection pipe. The filter mounting ring consists of two rings, an inner and an outer ring. The inner wall of the inner ring of the filter mounting ring is movably fitted to the outer wall of the reinjection pipe, and the outer wall of the outer ring of the filter mounting ring is movably fitted to the inner wall of the well base body. The filter is installed inside the filter mounting ring.

[0014] Furthermore, the filter screen adopts a two-layer design, the mesh size of the filter screen is 1-3mm, the top of the bracket is provided with vertically arranged positioning holes in a ring, and the bottom of the outer ring of the filter screen mounting ring is also provided with a ring-shaped positioning rod. After the filter screen mounting ring is placed inside the well base body, the positioning rod and the positioning hole cooperate with each other.

[0015] Compared with the prior art, the present invention provides a sealed, retractable recharge well cover.

[0016] 1. The well base body is designed with a detachable functional cover plate on top. A vertical return pipe is installed on the functional cover plate. The flange connecting piece at the bottom of the return pipe is connected to the flange of the return pump outlet. At the same time, a lateral return pipe is opened on the side wall of the well base body. The diameter of the return pipe is smaller than the inner diameter of the well base body, so that the water in the lateral return pipe enters the well base body. The return and return functions are handled by physically isolated independent channels, eliminating the traditional valve switching mechanism, thereby reducing the blockage and failure points caused by valve switching and improving reliability.

[0017] Furthermore, because the channels are independent of each other, it is possible to continuously perform high-flow reinjection through the side interface while simultaneously starting and running the return pump for well washing operations through the top interface. The two modes can be carried out simultaneously without interference, ensuring the continuity and stability of groundwater control and improving maintenance efficiency.

[0018] 2. By embedding a flange connecting piece at the bottom of the return pipe, a rigid and standardized connection with the return pump is provided. Through bolt tightening, a metal-to-metal rigid connection is formed that is sufficient to withstand high-pressure return conditions, solving the safety hazards such as detachment, pipe bursting and leakage that may exist in hose connections, and making the work site cleaner and safer. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of an integrally sealed, rechargeable manhole cover structure provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of components such as the functional cover plate and the return pipe provided in an embodiment of the present invention;

[0022] Figure 3This is a schematic diagram of the structure of components such as the docking plate and positioning plate provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the overall internal structure of the well base body provided in an embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional view of the return pipe and the conveying pipe provided in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the split state structure of the built-in filtering module provided in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Well base body; 2. Foundation flange; 3. Functional cover plate; 4. Return pipe; 5. Flange connecting piece; 6. Lateral return pipe; 7. Overlap ring; 8. Control valve; 9. Connecting plate; 10. Arc-shaped bayonet; 11. Sealing strip; 12. Stop block; 13. Positioning plate; 14. Sealing ring; 15. Positioning screw; 16. Delivery pipe; 17. Connecting flange; 18. Snap ring; 19. Threaded locking part; 20. Flow meter; 21. Bracket; 22. Filter screen mounting ring; 23. Filter screen; 24. Positioning insertion hole; 25. Positioning rod. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] As attached Figure 1 To be continued Figure 4 As shown:

[0030] Example 1:

[0031] This invention provides a sealed rechargeable well cover, including a well base body 1, which is a hollow cylindrical structure. The lower end of the well base body 1 is provided with a base flange 2 for fixing to the recharge well pipe. The top of the well base body 1 is provided with a detachable functional cover plate 3. The functional cover plate 3 is provided with a recharge pipe 4 extending vertically into the well base body 1. The bottom of the recharge pipe 4 is provided with a flange connecting piece 5. The flange connecting piece 5 is connected to the flange of the recharge pump outlet by fasteners.

[0032] It also includes a lateral recharge pipe 6, which is fixedly installed on the side wall of the well body 1. The central axis of the lateral recharge pipe 6 is not parallel to the central axis of the well body 1, forming a dedicated high-flow recharge channel.

[0033] The well base body 1 is equipped with a built-in filter module, which is located in the internal cavity of the well base body 1 and below the inner opening of the lateral reinjection pipe 6.

[0034] It should be noted that: the designed well base body 1 has a detachable functional cover plate 3 on its top. A vertical return pipe 4 is installed on the functional cover plate 3. The flange connecting piece 5 at the bottom of the return pipe 4 is connected to the flange of the return pump outlet. At the same time, a lateral return pipe 6 is opened on the side wall of the well base body 1. The diameter of the return pipe 4 is smaller than the inner diameter of the well base body 1, so that the water in the lateral return pipe 6 enters the well base body 1. The return and return functions are handled by physically isolated independent channels, eliminating the traditional valve switching mechanism, thereby reducing the blockage and failure points caused by valve switching and improving reliability.

[0035] Furthermore, because the channels are independent of each other, it is possible to continuously perform high-flow reinjection through the side interface while simultaneously starting and running the return pump for well washing operations through the top interface. The two modes can be carried out simultaneously without interference, ensuring the continuity and stability of groundwater control and improving maintenance efficiency.

[0036] In this embodiment: the well base body 1, the functional cover plate 3, the return pipe 4 and the lateral return pipe 6 are all made of metal materials and the surface is treated with anti-corrosion. The bottom of the base flange 2 is provided with an overlapping ring 7 that is stuck in the well pipe opening of the return well. The central axis of the lateral return pipe 6 is perpendicular to the central axis of the well base body 1.

[0037] It should be noted that using metal materials and applying anti-corrosion treatment ensures that the manhole cover device can be used for a long time without damage in humid and corrosive environments, thus extending its service life.

[0038] The overlapping ring 7 at the bottom of the base flange 2 can form a double connection structure with the wellhead of the reinjection well. It is connected by flange bolts and also by overlapping and clamping by the snap ring 18, which enhances the stability and sealing reliability of the connection and prevents the well cover from shifting or leaking when subjected to external forces.

[0039] By setting the lateral reinjection pipe 6 perpendicular to the well body 1, the reinjection water can enter the well at the optimal angle, reducing water flow resistance and improving reinjection efficiency.

[0040] In this embodiment: the diameter of the lateral reinjection pipe 6 is not less than DN100, the functional cover plate 3 is also provided with a control valve 8, the bottom of the functional cover plate 3 is provided with annularly distributed docking plates 9, the vertical cross-sectional profile of the docking plates 9 is "L" shaped, the docking plates 9 are provided with an arc-shaped bayonet 10 facing outward, the end of the transverse section profile of the docking plates 9 is provided with a sealing strip 11, and each docking plate 9 is provided with a stop block 12 along the side wall in the same direction.

[0041] It should be noted that: the diameter of the lateral recharge pipe 6 is not less than DN100 to ensure that the demand for large-flow recharge is met, supporting a recharge volume of 200 cubic meters per hour or more. The control valve 8 set on the functional cover plate 3 can be used to adjust the recharge flow or cut off the water flow in an emergency.

[0042] The “L”-shaped docking plate 9 and the arc-shaped bayonet 10 at the bottom of the functional cover plate 3 form a quick connection mechanism. After docking with the internal structure of the well base body 1, it can be rotated at a certain angle to achieve quick installation and fixation, simplifying the installation process.

[0043] The sealing strip 11 at the end of the transverse section of the docking plate 9 ensures the sealing between the functional cover plate 3 and the well seat body 1, preventing water leakage. The design of the stop block 12 limits the rotation angle, ensuring accurate alignment during installation and avoiding seal failure caused by excessive rotation.

[0044] In this embodiment: the well base body 1 is provided with a ring-shaped spaced positioning plate 13 inside. The cross-sectional profile of the positioning plate 13 is arc-shaped. The center of the positioning plate 13 is the same as the center of the functional cover plate 3. The outer wall of the functional cover plate 3 is provided with a vertically downward sealing ring 14. The outer wall of the sealing ring 14 is provided with a ring-shaped distributed positioning screw 15. When the functional cover plate 3 is installed with the well base body 1, the docking plate 9 is located between the two positioning plates 13. The functional cover plate 3 is rotated so that the arc-shaped bayonet 10 cooperates with the docking plate.

[0045] It should be noted that the annularly spaced arc-shaped positioning plates 13 inside the main body 1 of the well base form a precise fit with the docking plates 9 on the functional cover plate 3, ensuring that the functional cover plate 3 can be accurately aligned and firmly fixed. When the functional cover plate 3 is installed, the docking plates 9 are located between the two positioning plates 13. By rotating, the arc-shaped locking slots 10 engage with the positioning plates 13, forming a mechanical interlock structure. Then, by tightening the positioning screws 15, the positioning screws 15 pass through the sealing ring 14 and lock into the inside of the main body 1 of the well base, thus realizing the installation of the functional cover plate 3 and the main body 1 of the well base. This design is not only convenient to install, but also has a firm connection and can withstand high internal water pressure and external loads.

[0046] As attached Figure 5 As shown:

[0047] Example 2:

[0048] In this embodiment: the top of the return pipe 4 is also provided with the same flange connecting piece 5. The return pipe 4 is equipped with a conveying pipe 16. The outer wall of the conveying pipe 16 and the inner wall of the return pipe 4 cooperate with each other. The outer wall of the conveying pipe 16 is welded with a docking flange 17. The docking flange 17 and the flange connecting piece 5 are matched with each other. A retaining ring 18 is provided at the bottom of the docking flange 17 and on the outer wall of the conveying pipe 16. The vertical cross-sectional profile of the retaining ring 18 is "T" shaped.

[0049] It should be noted that the flange connection piece 5 at the top of the return pipe 4 can realize the connection with the external pipe, which enhances the applicability of the equipment. The design of the detachable conveying pipe 16 installed inside the return pipe 4 makes maintenance more convenient. When cleaning or replacement is required, only the conveying pipe 16 needs to be disassembled without affecting the main structure.

[0050] The precise fit between the outer wall of the conveying pipe 16 and the inner wall of the return pipe 4 ensures smooth water flow and prevents leakage. The matching design of the connecting flange 17 and the flange connecting piece 5 makes the connection more secure and reliable. The design of the T-shaped retaining ring 18 can play a guiding and positioning role during installation, ensuring that the conveying pipe 16 is accurately inserted into the return pipe 4. At the same time, it forms a mechanical lock after connection to prevent the conveying pipe 16 from shifting or falling off under the impact of high-pressure water flow.

[0051] In this embodiment: the conveying pipe 16 extends downward through the retaining ring 18. A threaded locking part 19 is provided on the outer wall of the vertical section of the retaining ring 18. After the conveying pipe 16 is inserted into the return pipe 4, the threaded locking part 19 and the internal thread on the inner wall of the return pipe 4 cooperate with each other. A flow meter 20 is also provided on the return pipe 4. The probe of the flow meter 20 extends into the conveying pipe 16.

[0052] It should be noted that the design of the conveying pipe 16 extending downward through the retaining ring 18 ensures that the water flow drawn by the return pump can smoothly enter the conveying pipe 16, reducing hydraulic loss. The threaded locking part 19 on the outer wall of the vertical section of the retaining ring 18 engages with the internal thread on the inner wall of the return pipe 4 to form a reliable threaded connection. This connection method is not only easy to install, but also can withstand high tension and pressure, ensuring that the conveying pipe 16 will not loosen or fall off during operation.

[0053] The flow meter 20 installed on the return pipe 4 can monitor the return flow in real time, providing data support for operation and management. The design of the probe extending into the delivery pipe 16 can accurately measure the water flow parameters in the pipe and avoid data errors caused by improper measurement position.

[0054] As attached Figure 6 As shown:

[0055] Example 3:

[0056] In this embodiment: the built-in filter module includes a bracket 21, a filter mounting ring 22, and a filter 23. The bracket 21 has an annular cross-sectional profile and is welded to the inner wall of the well base body 1. The bracket 21 is located below the outlet of the lateral reinjection pipe 6. The filter mounting ring 22 consists of two rings, an inner and an outer ring. The inner wall of the inner ring of the filter mounting ring 22 is in movable contact with the outer wall of the reinjection pipe 4, and the outer wall of the outer ring of the filter mounting ring 22 is in movable contact with the inner wall of the well base body 1. The filter 23 is installed inside the filter mounting ring 22.

[0057] It should be noted that the built-in filter module adopts a combination design of bracket 21, filter installation ring 22 and filter 23, realizing a modular structure, which is convenient for installation, cleaning and replacement. Among them, bracket 21 is welded to the inner wall of the well base body 1 and is located below the outlet of the lateral reinjection pipe 6. It can effectively receive all reinjection water flow and guide it through the filter 23.

[0058] The filter screen 23 and the mounting ring 22 adopt a two-ring design. The inner ring fits movably against the outer wall of the return pipe 4, and the outer ring fits movably against the inner wall of the well base body 1. This forms a stable support structure while ensuring that all return water must pass through the filter screen 23 before entering the well, avoiding short-circuiting of the water flow. The filter screen 23 is installed inside the filter screen mounting ring 22, which can effectively intercept suspended solids, silt, and other impurities in the water, preventing blockage in the well. Moreover, when the filter screen 23 needs to be cleaned later, the functional cover plate 3 can be quickly removed from the well base body 1 for cleaning of the inside of the well base body 1, which is convenient and quick.

[0059] In this embodiment: the filter screen 23 adopts a two-layer design, the mesh size of the filter screen 23 is 1-3mm, the top of the bracket 21 is provided with vertically arranged positioning holes 24 in a ring, and the bottom of the outer ring of the filter screen mounting ring 22 is also provided with a ring-shaped positioning rod 25. After the filter screen mounting ring 22 is placed in the well base body 1, the positioning rod 25 and the positioning hole 24 cooperate with each other.

[0060] It should be noted that the filter screen 23 adopts a two-layer design to improve filtration efficiency and dirt holding capacity. The upper filter screen 23 can intercept larger particles, while the lower filter screen 23 can intercept smaller particles. The double-layer protection extends the filtration cycle.

[0061] The mesh size of 1-3mm effectively intercepts impurities without causing excessive head loss, thus balancing the relationship between filtration effect and water flow resistance.

[0062] The positioning hole 24 on the top of the bracket 21 cooperates with the positioning rod 25 at the bottom of the filter screen mounting ring 22 to achieve quick and accurate positioning of the filter screen mounting ring 22, ensuring that it will not be tilted during installation. At the same time, it can also prevent the filter screen mounting ring 22 from moving or rotating during operation, thus improving the stability of the structure. This plug-in positioning structure is simple and reliable, and makes it easy for operators to quickly complete the installation and replacement of the filter screen.

[0063] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sealed, rechargeable well cover, characterized in that, include: The well base body (1) is a hollow cylindrical structure. The lower end of the well base body (1) is provided with a base flange (2) for fixing with the well pipe of the reinjection well. The top of the well base body (1) is provided with a detachable functional cover plate (3). The functional cover plate (3) is provided with a vertically extending return pipe (4) into the well base body (1). The bottom of the return pipe (4) is provided with a flange connecting piece (5). The flange connecting piece (5) is connected to the flange of the return pump outlet by fasteners. It also includes a lateral recharge pipe (6), which is fixedly installed on the side wall of the well body (1). The central axis of the lateral recharge pipe (6) is not parallel to the central axis of the well body (1), forming a dedicated high-flow recharge channel. The well base body (1) is equipped with a built-in filter module. The built-in filter module is located in the internal cavity of the well base body (1) and below the inner opening of the lateral recharge pipe (6).

2. The sealed, rechargeable well cover according to claim 1, characterized in that, The main body (1), functional cover plate (3), return pipe (4) and lateral return pipe (6) are all made of metal materials and the surface is treated with anti-corrosion. The bottom of the base flange (2) is provided with an overlapping ring (7) that is stuck in the wellhead of the return well. The central axis of the lateral return pipe (6) is perpendicular to the central axis of the main body (1).

3. The sealed, rechargeable well cover according to claim 1, characterized in that, The diameter of the lateral reinjection pipe (6) is not less than DN100. The functional cover plate (3) is also provided with a control valve (8). The bottom of the functional cover plate (3) is provided with annularly distributed docking plates (9). The vertical cross-sectional profile of the docking plates (9) is "L" shaped. The docking plates (9) are provided with an arc-shaped bayonet (10) facing outward. The end of the transverse section profile of the docking plates (9) is provided with a sealing strip (11). Each docking plate (9) is provided with a stop block (12) on the side wall along the same direction.

4. A sealed, rechargeable well cover according to claim 3, characterized in that, The well base body (1) is provided with a ring-shaped spaced positioning plate (13) inside. The cross-sectional profile of the positioning plate (13) is arc-shaped. The center of the positioning plate (13) is the same as the center of the functional cover plate (3). The outer wall of the functional cover plate (3) is provided with a vertically downward sealing ring (14). The outer wall of the sealing ring (14) is provided with a ring-shaped positioning screw (15). When the functional cover plate (3) is installed with the well base body (1), the docking plate (9) is located between the two positioning plates (13). The functional cover plate (3) rotates to make the arc-shaped bayonet (10) cooperate with the docking plate.

5. A sealed, rechargeable well cover according to claim 1, characterized in that, The top of the return pipe (4) is also provided with the same flange connecting piece (5). A conveying pipe (16) is installed inside the return pipe (4). The outer wall of the conveying pipe (16) and the inner wall of the return pipe (4) cooperate with each other. A butt flange (17) is welded on the outer wall of the conveying pipe (16). The butt flange (17) matches the flange connecting piece (5). A retaining ring (18) is provided at the bottom of the butt flange (17) and on the outer wall of the conveying pipe (16). The vertical cross-sectional profile of the retaining ring (18) is "T".

6. A sealed, rechargeable well cover according to claim 5, characterized in that, The conveying pipe (16) extends downward through the retaining ring (18). A threaded locking part (19) is provided on the outer wall of the vertical section of the retaining ring (18). After the conveying pipe (16) is inserted into the return pipe (4), the threaded locking part (19) cooperates with the internal thread on the inner wall of the return pipe (4). A flow meter (20) is also provided on the return pipe (4), and the probe of the flow meter (20) extends into the conveying pipe (16).

7. A sealed, rechargeable well cover according to claim 1, characterized in that, The built-in filter module includes a bracket (21), a filter installation ring (22), and a filter (23). The bracket (21) has an annular cross-sectional profile and is welded to the inner wall of the well body (1). The bracket (21) is located below the outlet of the lateral recharge pipe (6). The filter installation ring (22) consists of two rings, an inner and an outer ring. The inner wall of the inner ring of the filter installation ring (22) is in movable contact with the outer wall of the recharge pipe (4). The outer wall of the outer ring of the filter installation ring (22) is in movable contact with the inner wall of the well body (1). The filter (23) is installed inside the filter installation ring (22).

8. A sealed, rechargeable well cover according to claim 7, characterized in that, The filter screen (23) adopts a two-layer design. The mesh size of the filter screen (23) is 1-3mm. The top of the bracket (21) is provided with vertically arranged positioning holes (24) in a ring. The bottom of the outer ring of the filter screen mounting ring (22) is also provided with ring-arranged positioning rods (25). After the filter screen mounting ring (22) is placed inside the well base body (1), the positioning rods (25) and the positioning holes (24) cooperate with each other.

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