A filter screen type anti-blocking overflow port device suitable for sunken green and a construction method thereof

Abstract

The application discloses a kind of suitable for concave greenbelt filter screen type anti-blocking overflow port device and construction method, device includes W-shaped filter screen unit (1) and anti-inclined filter screen unit (2), when greenbelt water level is higher than overflow well 3 water level, by the anti-inclined filter screen (21) of anti-inclined filter screen unit (2), larger sundries in overflow water flow is filtered and intercepted, small sundries is filtered by W-shaped filter screen unit (1) W-shaped filter screen (114) and deposited in W-shaped filter screen (114) recess, does not affect other part to pass water, by W-shaped filter screen unit (1) and anti-inclined filter screen unit (2) in blocking sundries while ensuring that not being affected by sundries to maintain high overflow, and W-shaped filter screen structure has greater surface area with overflow water flow contact, effectively expands water area, guarantees that water flow can be drained in time;And by rotary lever mechanism (124) control to open type well lid opening and closing and anti-inclined filter screen (21) inclination installation make filter screen filter sundries more convenient to clean.

Description

Technical Field

[0001] This invention belongs to the field of overflow manhole cover technology, and more specifically, relates to a filter-type anti-clogging overflow outlet device suitable for recessed green spaces and its construction method. Background Technology

[0002] A sponge city refers to a city that, like a sponge, has good "elasticity" in adapting to environmental changes and responding to natural disasters. When it rains, it absorbs, stores, infiltrates, and purifies water, enabling rainwater to migrate freely within the city.

[0003] Existing overflow manhole covers mainly include convex and flat grate types. Flat grate manhole covers are the most common type on the market and are mainly used for drainage on municipal roads. The structure includes a flat overflow well surface, which is level with the overflow height. Several overflow holes are arranged on it, and the overflow water enters the municipal pipe network through the overflow holes.

[0004] In practical applications, the lack of effective filtration methods poses a risk of large amounts of debris entering drainage pipes and causing blockages. Previously, fine-pore filters were typically installed under the well surface, but this still suffers from the drawback of small debris such as soil and weeds clogging the filters and significantly reducing overflow efficiency. To solve the clogging problem of flat-grate manhole covers, convex manhole covers were developed, greatly enhancing their filtration performance and addressing the issue of high water levels during heavy rain. However, in practical applications, when the water level is low and the flow rate is slow, soil, leaves, weeds, and other debris easily accumulate around the well, causing the overflow level to rise accordingly. This prevents timely drainage and leads to water loss. Furthermore, the large openings in existing spherical and square manhole covers make it difficult to trap small debris. Even with traditional filters added to the manhole cover, small amounts of soil and weeds can easily get stuck on the filters at a certain water level, leading to a decrease in water flow rate and even blockages. In addition, due to the raised slope design, when the water level is higher than the overflow capacity, the water in the upper layer has to overcome gravity to climb up, which leads to a decrease in the overflow capacity. Summary of the Invention

[0005] To address the above-mentioned deficiencies or improvement needs of existing technologies, this invention provides a filter-type anti-clogging overflow outlet device suitable for recessed green spaces and its construction method. The device's anti-tilting filter unit and W-shaped filter unit prevent larger debris from accumulating around the well and maintain a high overflow effect after filtering out small debris from the filter screen.

[0006] To achieve the above objectives, the present invention provides the following technical solution for a filter-type anti-clogging overflow outlet device and its construction method suitable for sunken green spaces:

[0007] A filter-type anti-clogging overflow outlet device suitable for sunken green spaces includes a W-shaped filter unit and a reverse-tilting filter unit. The W-shaped filter unit includes a W-shaped filter unit filter assembly and a W-shaped filter unit frame assembly.

[0008] The W-shaped filter unit filter group includes a W-shaped filter, a filter square frame, and a filter center support. The W-shaped filter is maintained in a "W" shape by fixing the center position of the W-shaped filter and welding the filter square frame to the W-shaped filter. Thus, while filtering fine impurities, the fine impurities deposit in its concave part do not affect its overflow effect.

[0009] The reverse-tilting filter unit includes a reverse-tilting filter with a large aperture, which is installed at an angle on the overflow wellhead. The reverse-tilting filter filters out larger debris and does not cause the debris to accumulate under gravity.

[0010] The W-shaped filter unit and the anti-tilting filter unit achieve the filtering of debris in the overflow water flow without affecting the overflow effect;

[0011] Furthermore, the W-shaped filter unit filter assembly also includes a filter lock, which fixes the center position of the W-shaped filter on the filter lock and can fix the W-shaped filter on the filter center support by fixing it to the filter center support;

[0012] Furthermore, the W-shaped filter unit frame assembly includes a split manhole cover with positioning holes on it, and the anti-tilting filter unit is connected through the split manhole cover.

[0013] Furthermore, the W-shaped filter unit frame assembly also includes a rotating mechanism, which is installed on the positioning hole at the bottom of the split manhole cover, and controls the opening and closing of the split manhole cover through the rotating mechanism;

[0014] Furthermore, the W-shaped filter unit frame group also includes a limiting slot, which limits the rotation angle range of the rotating mechanism when the split manhole cover is closed;

[0015] Furthermore, the W-shaped filter unit frame assembly also includes an upper part of a split-type manhole cover that is fixed to the limiting bayonet by welding. The upper part of the split-type manhole cover and the limiting bayonet form an opening, through which the position of the filter center support is fixed.

[0016] Furthermore, the W-shaped filter unit frame group also includes a fall-prevention crossbar, which is welded to the upper part of the split manhole cover and the limiting bayonet to stabilize the structure of the W-shaped filter unit frame group.

[0017] Furthermore, the W-shaped filter unit frame assembly also includes a manhole cover connection bayonet, through which the rotating mechanism is installed on the lower part of the split manhole cover and protrudes, through which the W-shaped filter unit frame assembly is installed on the overflow well.

[0018] Furthermore, the anti-tilting filter unit also includes an anti-tilting filter frame, through which the anti-tilting filter is welded and installed;

[0019] A construction method for a filter-type anti-clogging overflow outlet suitable for sunken green spaces, characterized by the application of a filter-type anti-clogging overflow outlet device as described in claims 1-9; the construction method includes the following steps:

[0020] S1. Install the W-shaped filter unit filter assembly.

[0021] The center position of the W-shaped filter is fixed on the filter lock by the filter lock, and the position of the filter lock is fixed by the filter center bracket at the same time as the position of the W-shaped filter.

[0022] S2. Install the W-shaped filter unit frame assembly.

[0023] The rotating rod, including the rotating mechanism and the manhole cover connecting bayonet, is matched and installed with the positioning hole at the bottom of the split manhole cover. Furthermore, the manhole cover connecting bayonet is matched and installed with the installation hole of the overflow well inlet to complete the installation of the W-shaped filter screen unit frame assembly.

[0024] S3. Install reverse-tilting filter unit

[0025] The installation of the reverse-tilting filter frame and the reverse-tilting filter screen fixed to it is completed by fitting the reverse-tilting filter frame onto the lower part of the split manhole cover.

[0026] S4. Filtering impurities using a reverse-tilting filter and a W-shaped filter.

[0027] After the overflow water flows through the reverse-tilting filter, larger impurities in the overflow water are filtered out by the reverse-tilting filter. The overflow water that has had its larger impurities initially filtered out by the reverse-tilting filter then flows through the W-shaped filter. At the same time, smaller impurities in the overflow water are filtered out by the W-shaped filter, and due to gravity, the filtered smaller impurities are deposited in the concave part of the W-shaped filter.

[0028] S5. Clean debris from the reverse-tilting filter and the W-shaped filter.

[0029] After drainage is completed, the debris filtered and suspended on the reverse-tilting filter screen will fall off naturally due to gravity, without the need for manual cleaning; the debris cleaning of the W-shaped filter screen requires disassembling the reverse-tilting filter screen unit and then opening the split manhole cover through a rotating mechanism for manual cleaning.

[0030] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0031] 1. The present invention provides a W-shaped filter unit filter group suitable for a recessed green space filter-type anti-clogging overflow outlet device. The filter screen for filtering fine debris is maintained in a W-shaped structure. Thus, while the W-shaped filter screen filters and intercepts fine debris such as soil and weeds, the fine debris is deposited in the concave part of the W-shaped filter screen due to gravity. The deposition position is lower than the overflow well opening position, thereby ensuring that the water flow capacity of the overflow outlet is not affected by the accumulation of fine debris.

[0032] 2. The W-shaped filter unit of the present invention, which is applicable to the anti-clogging overflow device of the filter screen in the recessed green space, maintains the filter screen for filtering fine debris in a W-shaped filter structure. The W-shaped filter structure has a larger surface area in contact with the overflow water flow, thus effectively expanding the water flow area and ensuring that the water flow can be discharged in a timely manner.

[0033] 3. The reverse-tilting filter unit of the present invention, which is suitable for the overflow outlet device of the recessed green space filter screen, is installed at an incline at the overflow well opening. The reverse-tilting filter screen performs initial filtration on the overflow water flow, filters and intercepts larger debris carried in the overflow water flow, and the intercepted larger debris falls off naturally under the action of gravity and will not accumulate around the well.

[0034] 4. The W-shaped filter unit of the present invention, which is applicable to the overflow outlet device of the filter screen in the recessed green space, includes a rotary rod mechanism. The rotary rod mechanism controls the opening and closing of the split manhole cover, which facilitates the cleaning of debris from the filter screen. In addition, the reverse tilt filter screen of the present invention is installed at an angle on the overflow well. Larger debris filtered and intercepted by the reverse tilt filter screen falls off due to gravity, eliminating the need for manual cleaning and making the cleaning of debris filtered by the filter screen more convenient. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a filter-type anti-clogging overflow outlet device suitable for recessed green spaces according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of a W-shaped filter unit structure for a filter-type anti-clogging overflow outlet device suitable for recessed green spaces, according to an embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of a W-shaped filter unit filter group structure for a filter-type anti-clogging overflow port device suitable for recessed green spaces, according to an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of a square clamp structure for a W-shaped filter unit filter group of a filter screen type anti-clogging overflow port device suitable for recessed green spaces, according to an embodiment of the present invention.

[0039] Figure 5 This is a schematic diagram of a W-shaped filter unit frame structure for a filter-type anti-clogging overflow outlet device suitable for recessed green spaces, according to an embodiment of the present invention.

[0040] Figure 6 This is a schematic diagram of a reverse-tilting filter unit structure for a filter-type anti-clogging overflow outlet device suitable for recessed green spaces, according to an embodiment of the present invention.

[0041] Figure 7 This is a schematic diagram of a reverse-tilting filter structure for a filter-type anti-clogging overflow outlet device suitable for recessed green spaces, according to an embodiment of the present invention.

[0042] Figure 8 This is a schematic diagram of a reverse-tilting filter frame structure for a filter-type anti-clogging overflow outlet device suitable for recessed green spaces, according to an embodiment of the present invention.

[0043] Figure 9 This is a schematic diagram illustrating the debris cleaning process of a filter-type anti-clogging overflow outlet device suitable for recessed green spaces, according to an embodiment of the present invention.

[0044] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-W-shaped filter unit, 2-anti-tilting filter unit, 3-overflow well, 11-W-shaped filter unit filter assembly, 12-W-shaped filter unit frame assembly, 21-anti-tilting filter, 22-anti-tilting filter frame, 111-filter center support, 112-filter square frame, 113-filter lock, 114-W-shaped filter, 121-upper part of split manhole cover, 122-lower part of split manhole cover, 123-anti-fall crossbar, 124-rotating mechanism, 125-manhole cover connection bayonet, 126-limiting bayonet. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0046] like Figure 1As shown, the present invention provides a filter-type anti-clogging overflow device for sunken green spaces, comprising a W-shaped filter unit 1 and a reverse-tilting filter unit 2, wherein the reverse-tilting filter unit 2 is installed on the W-shaped filter unit 1. When the water level in the green belt is higher than the water level in the overflow well 3, the overflow water flows through the filter-type anti-clogging overflow device for sunken green spaces and then enters the overflow well to complete drainage. In this process, the overflow water first passes through the reverse-tilting filter unit 2, which performs initial filtration. During the initial filtration, larger debris carried by the overflow water is intercepted. Furthermore, since the reverse-tilting filter unit 2 is installed at an incline on the overflow well 3, larger debris will not accumulate around the overflow well 3. Accumulation of debris can affect the overflow drainage of this device. After the overflow water flows through the reverse-tilting filter unit 2 and is initially filtered, it flows through the W-shaped filter unit 1 and then enters the overflow well 3 to complete the drainage. During this process, small debris, including weeds and soil, in the overflow water that has had larger debris filtered out by the reverse-tilting filter unit 2 is intercepted by the W-shaped filter unit 1. At the same time, due to gravity, the intercepted small debris is deposited at the bottom of the W-shaped filter unit 1, and the deposited part is lower than the wellhead of the overflow well 3, so it does not affect the overflow drainage of the W-shaped filter unit 1. The W-shaped filter unit 1 and the reverse-tilting filter unit 2 block debris while ensuring that the high overflow effect is not affected by debris.

[0047] The structure of the W-shaped filter unit 1 is shown in the figure below. Figure 2 It includes a W-shaped filter unit filter group 11 and a W-shaped filter unit frame group 12. The W-shaped filter unit filter group 11 filters out fine debris and maintains the filter in a "W" shape. The W-shaped filter unit frame group 12 connects and fixes the W-shaped filter unit filter group 11 and is connected and fixed to the overflow well 3 through the W-shaped filter unit frame group.

[0048] The W-shaped filter unit filter assembly 11 is shown in the figure below. Figure 3 The system includes a square clamp consisting of a filter screen center support 111 and a filter screen square frame 112, a filter screen lock 113, and a W-shaped filter screen 114. The W-shaped filter screen 114 is made of flexible steel wire mesh with numerous overflow holes running through its surface. The hole size is maintained within the range for filtering small debris such as mud and weeds. The edges of the W-shaped filter screen 114 are fixedly connected to the filter screen square frame 112 by welding, and the size of the filter screen square frame 112 matches the size of the overflow well 3 opening. The center position is fixed by being fastened by the filter screen lock 113. The structure of the square clamp is described in detail below. Figure 4The filter screen center support 111 and the filter screen square frame 112 are fixed by welding. The filter screen center support 111 has a fixing plate with a circular opening. When installing the filter screen anti-clogging overflow port device suitable for recessed green space, the filter screen lock 113 fixed on the W-shaped filter screen is lifted. The filter screen lock 113 is locked on the fixing plate through the circular opening on the fixing plate of the filter screen center support 111. At the same time, the W-shaped filter screen 114 is maintained in a "W" shape by the square clamp composed of the filter screen lock 113, the filter screen center support 111 and the filter screen square frame 112 under the action of gravity.

[0049] When the overflow water flows through the W-shaped filter 114, the mud, weeds, and other debris in the overflow water are filtered and intercepted by the W-shaped filter 114. The W-shaped filter 114 is fixed to the filter center support 111 by the filter center support 111 and the filter square frame 112. The W-shaped filter 114 is fixed into a "W" shape by the filter center support 111 and the filter square frame 112. As a result, the small debris such as mud and weeds that are filtered and intercepted by the W-shaped filter 114 will be suspended by gravity and deposited in the concave part of the W-shaped filter 114. Since the deposit position of the small debris is much lower than the overflow water level, the small debris is filtered without affecting the overflow water flow of other parts of the W-shaped filter 114.

[0050] The structure of the W-shaped filter unit frame group 12 is shown in the figure below. Figure 5 The manhole cover includes an upper part 121, a lower part 122, a fall arrestor 123, a rotating mechanism 124, a manhole cover connecting slot 125, and a limiting slot 126. The upper part 121 and the lower part 122 constitute a split manhole cover. The upper part 121 is disconnected at its top center, and the top center of the upper part 121 and the limiting slot 126 are welded together to form an opening. The size of this opening matches the fixing plate on the filter center support 111 of the W-shaped filter unit filter assembly 11. The interior of the upper part 121, the connection between the upper part 121 and the limiting slot 126... Multiple anti-fall crossbars 123 are welded together between the locking slots 126, making the entire W-shaped filter unit frame assembly 12 structure more stable and reliable. The lower part 122 of the split-type manhole cover has positioning holes, through which a rotating rod including a rotating mechanism 124 and a manhole cover connecting slot 125 is connected. The rotating mechanism 124 is located inside the split-type manhole cover, and the manhole cover connecting slot 125 is located on the protruding part of the split-type manhole cover. The W-shaped filter unit frame assembly 12 is matched and installed with the positioning holes on the overflow manhole 3 via the manhole cover connecting slot 125. After the W-shaped filter unit frame assembly 12 is matched and installed with the overflow manhole 3, the rotating mechanism 124 opens or closes the W-shaped filter unit frame assembly 12, and the limiting slot 126 controls the position of the W-shaped filter unit frame assembly 12 when closed.

[0051] During the process of overflowing water entering the overflow well 3 after passing through the W-shaped filter unit 1 to complete overflow drainage, the W-shaped filter unit frame group 12 is closed by the rotating mechanism 124. At the same time, when the W-shaped filter unit frame group 12 is closed, the opening formed by the upper part 121 of the split manhole cover and the limiting slot 126 matches the fixing plate on the filter center support 111 of the W-shaped filter unit filter group 11, which plays a role in stabilizing the W-shaped filter unit filter group 11. Meanwhile, the entire W-shaped filter unit frame group 12 structure is more stable and reliable through the anti-fall crossbar 123. After the overflowing water has finished draining through the present invention, the W-shaped filter unit frame group 12 is opened by the rotating mechanism 124, so that the W-shaped filter 114 can be cleaned, realizing the quick and convenient cleaning of debris on the filter.

[0052] The structure of the anti-tilting filter unit 2 is shown in the figure below. Figure 6 It includes a reverse-tilting filter screen 21 and a reverse-tilting filter screen frame 22. The reverse-tilting filter screen unit 2 is installed to the overflow well 3 and supported and fixed by the reverse-tilting filter screen frame 22; the reverse-tilting filter screen 21 is as follows: Figure 7 As shown, when the overflow water level is higher than the overflow well, the overflow water flows through the reverse-tilting filter screen 21 and is filtered by it to remove larger debris. The reverse-tilting filter screen 21 has a flexible steel wire mesh structure with large overflow holes on its surface, which can filter larger debris. The reverse-tilting filter screen 21 is fixed to the reverse-tilting filter screen frame 22 by welding. The reverse-tilting filter screen frame 22 is as follows: Figure 8 As shown, it is made of multiple hollow steel pipes welded together. The bottom steel pipes of the anti-tilting filter frame 22 are spaced to match the size of the lower part 122 of the split manhole cover. The anti-tilting filter unit 2 is installed by fixing the anti-tilting filter frame 22 to the lower part 122 of the split manhole cover of the installed W-shaped filter unit frame group 12.

[0053] Before using the reverse-tilting filter unit 2, the reverse-tilting filter frame 22 is matched with the lower part 122 of the split manhole cover. Then, the reverse-tilting filter frame 22 is fastened onto the lower part 122 of the split manhole cover, thus completing the installation of the reverse-tilting filter frame 22 and the reverse-tilting filter 21, which is fixedly installed on the reverse-tilting filter frame 22 by welding. When the overflow water flows through the reverse-tilting filter unit 2, the reverse-tilting filter 21 filters and intercepts larger debris carried in the overflow water. At the same time, due to the oblique installation method of the reverse-tilting filter unit 2, the debris suspended on the reverse-tilting filter 21 automatically falls off due to gravity, thus preventing larger debris from accumulating around the manhole and making it easy to clean the debris on the filter.

[0054] This invention provides an embodiment of a construction method for the aforementioned filter-type anti-clogging overflow outlet device suitable for sunken green spaces, the specific steps of which are as follows:

[0055] S1. Install W-shaped filter unit filter assembly 11

[0056] The central part of the W-shaped filter 114, which is fixedly connected to the filter square frame 114 by welding, is lifted and secured by the filter lock 113, which is then installed on the W-shaped filter 114. Furthermore, the filter lock 113 is secured by the fixing plate with a circular opening on the filter center support 111, while the W-shaped filter 114 is maintained in a "W" shape by the square clamp composed of the filter lock 113, the filter center support 111, and the filter square frame 112 under the action of gravity.

[0057] S2, Install W-shaped filter unit frame assembly 12

[0058] Before installing the W-shaped filter unit frame assembly 12, the rotating rod, including the rotating mechanism 124 and the manhole cover connecting bayonet 125, is matched and installed with the positioning hole of the lower part 122 of the split manhole cover. Further, the manhole cover connecting bayonet 125 is matched and installed with the installation hole of the overflow well 3 inlet to complete the installation of the W-shaped filter unit frame assembly 12. After the installation is completed, the split manhole cover is closed by the rotating mechanism 124, so that the opening formed by the upper part 121 of the split manhole cover and the limiting bayonet 126 matches the fixing plate on the filter center support 111 of the W-shaped filter unit filter assembly 11, thereby stabilizing the W-shaped filter unit filter assembly 11.

[0059] S3, Install reverse-tilting filter unit 2

[0060] Since the bottom steel pipes of the anti-tilting filter frame 22 are spaced to match the size of the lower part 122 of the split manhole cover, the anti-tilting filter frame 22 and the anti-tilting filter 21 fixed thereon by welding can be installed by fitting the anti-tilting filter frame 22 onto the lower part 122 of the split manhole cover.

[0061] S4. Impurities are filtered through the anti-tilting filter 21 and the W-shaped filter 114.

[0062] When the overflow water level is higher than the overflow well 3, the overflow water first passes through the reverse-tilting filter 21. At the same time, larger debris in the overflow water is filtered by the reverse-tilting filter 21. The overflow water, after the larger debris has been initially filtered out by the reverse-tilting filter 21, then passes through the W-shaped filter 114. At the same time, small debris such as weeds and mud in the overflow water is filtered by the W-shaped filter 114. Due to gravity, the filtered small debris is deposited in the concave part of the W-shaped filter 114. Since the deposition position is lower than the overflow well 3, it does not affect the drainage efficiency of other parts.

[0063] S5. Clean debris from the anti-tilting filter 21 and the W-shaped filter 114.

[0064] After drainage is complete, the debris filtered and suspended on the reverse-tilting filter screen 21 falls off naturally due to gravity, requiring no manual cleaning; the debris cleaning of the W-shaped filter screen 114 is as follows: Figure 9 As shown, after the worker removes the locked anti-tilting filter unit 2, the split manhole cover can be opened by rotating the mechanism 124 to clean the debris deposited in the concave part of the W-shaped filter 114. After cleaning, the split manhole cover can be closed by rotating the mechanism 124 to lock the anti-tilting filter unit 2, making it convenient for the present invention to be reused as a filter-type anti-clogging overflow outlet device for concave green areas.

[0065] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A filter-type anti-clogging overflow outlet device suitable for sunken green spaces, comprising a W-shaped filter unit (1) and a reverse-tilting filter unit (2), wherein the W-shaped filter unit (1) comprises a W-shaped filter unit filter assembly (11) and a W-shaped filter unit frame assembly (12); wherein, The W-shaped filter unit filter group (11) includes a W-shaped filter (114), a filter square frame (112), and a filter center support (111). The W-shaped filter is maintained in a "W" shape by fixing the center position of the W-shaped filter (114) with the filter center support (111) and welding the filter square frame (112) to the W-shaped filter (114). Thus, while filtering fine impurities, the fine impurities deposit in its concave part do not affect its overflow. The anti-tilting filter unit (2) includes an anti-tilting filter (21) with a large aperture and is installed at an angle on the overflow wellhead. The anti-tilting filter (21) filters out larger debris and does not cause the debris to accumulate under gravity. The W-shaped filter unit (1) and the anti-tilting filter unit (2) achieve the filtering of debris in the overflow water flow without affecting the overflow; The W-shaped filter unit frame group (12) includes a split manhole cover lower part (122), and the split manhole cover lower part (122) has positioning holes, and the anti-tilting filter unit (2) is connected through the split manhole cover lower part (122); The W-shaped filter unit frame group (12) also includes a rotating mechanism (124), which is installed on the positioning hole of the lower part (122) of the split manhole cover, and controls the opening and closing of the split manhole cover through the rotating mechanism (124); The W-shaped filter unit frame group (12) also includes a limiting slot (126), which limits the rotation angle range of the rotating mechanism (124) when the split manhole cover is closed; The W-shaped filter unit frame group (12) also includes a split-type manhole cover upper part (121) that is fixed to the limiting bayonet (126) by welding. The split-type manhole cover upper part (121) and the limiting bayonet (126) form an opening, and the position of the filter center support (111) is fixed through the opening.

2. The device for preventing overflow of a filter screen in a recessed green space according to claim 1, characterized in that, The W-shaped filter unit filter group (11) also includes a filter lock (113), which fixes the center position of the W-shaped filter (114) on the filter lock (113), and can fix the W-shaped filter on the filter center support (111) by fixing it to the filter center support (111) through the filter lock (113).

3. A filter-type anti-clogging overflow outlet device suitable for recessed green spaces according to claim 2, characterized in that, The W-shaped filter unit frame group (12) also includes a fall-prevention crossbar (123), which connects the upper part (121) of the split manhole cover and the limiting bayonet (126) by welding, so that the structure of the W-shaped filter unit frame group (12) is stable.

4. A filter-type anti-clogging overflow outlet device suitable for recessed green spaces according to claim 3, characterized in that, The W-shaped filter unit frame assembly (12) also includes a manhole cover connecting bayonet (125), through which the rotating mechanism (124) is installed on the lower part (122) of the split manhole cover, and through which the W-shaped filter unit frame assembly (12) is installed on the overflow well (3).

5. A filter-type anti-clogging overflow outlet device suitable for recessed green spaces according to any one of claims 2-4, characterized in that, The anti-tilting filter unit (2) also includes an anti-tilting filter frame (22), through which the anti-tilting filter (21) is welded and installed.

6. A construction method for a filter-type anti-clogging overflow outlet suitable for sunken green spaces, characterized in that, The method employs a filter-type anti-clogging overflow device suitable for sunken green spaces, as described in any one of claims 2-5; the construction method includes the following steps: S1. Install the W-shaped filter unit filter assembly (11) The center position of the W-shaped filter (114) is fixed on the filter lock (113) by the filter lock (113), and the position of the filter lock (113) is fixed by the filter center bracket (111) at the same time. S2. Install the W-shaped filter unit frame assembly (12) The rotating rod, including the rotating mechanism (124) and the manhole cover connecting bayonet (125), is matched and installed with the positioning hole of the lower part (122) of the split manhole cover, and the manhole cover connecting bayonet (125) is matched and installed with the installation hole of the overflow well (3) to complete the installation of the W-shaped filter unit frame group (12). S3. Install the reverse-tilting filter unit (2) The installation of the anti-tilting filter frame (22) and the anti-tilting filter (21) fixed thereon by welding is completed by fastening the anti-tilting filter frame (22) to the lower part (122) of the split manhole cover; S4. Impurities are filtered through the reverse-tilting filter (21) and the W-shaped filter (114). After the overflow water flows through the reverse-tilting filter (21), larger impurities in the overflow water are filtered by the reverse-tilting filter (21). The overflow water that has been initially filtered out by the reverse-tilting filter (21) then flows through the W-shaped filter (114). At the same time, small impurities in the overflow water are filtered by the W-shaped filter (114), and due to gravity, the filtered small impurities are deposited in the concave part of the W-shaped filter (114). S5. Clean debris from the reverse-tilting filter (21) and the W-shaped filter (114). After drainage is completed, the debris filtered and suspended on the reverse-tilting filter screen (21) will fall off naturally due to gravity and will not require manual cleaning. The debris cleaning of the W-shaped filter screen (114) requires manual cleaning by disassembling the reverse-tilting filter screen unit (2) and opening the split manhole cover through the rotating mechanism (124).

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