Water-seal rainwater inlet and method of making same

Abstract

The application discloses a water seal rainwater inlet and a preparation method thereof, and belongs to the technical field of drainage collection and water seal equipment. The water seal rainwater inlet comprises a well body, a rainwater grate and a water seal assembly. A guide rail is arranged on the inner side wall of the well body in the vertical direction. The water seal assembly is a detachable modular water seal box, which is provided with a guide structure for sliding cooperation with the guide rail. The water seal box is provided with an outlet opening at the bottom, and a water outlet is formed in the upper part of the side surface of the water seal box, which faces the drainage outlet of the well body. The water seal box is modular and detachable through the guide rail, and the rainwater collection and water seal functions are highly integrated. The water seal rainwater inlet has the characteristics of small land occupation, low investment, convenient maintenance and replacement, flexible material selection, strong adaptability and high safety. The preparation method can realize factory prefabrication, is convenient for construction, and is controllable in quality, and is particularly suitable for fire-fighting wastewater collection and fire safety reconstruction in fine chemical industries.

Description

Technical Field

[0001] This invention relates to the field of drainage collection and water seal equipment technology, and in particular to a water-sealed rainwater inlet and its preparation method. Specifically, it relates to a water-sealed rainwater inlet for use in the fine chemical industry or similar locations where it is necessary to prevent the spread of flammable liquid fires, and a method for preparing the water-sealed rainwater inlet. Background Technology

[0002] In the drainage design of chemical, petroleum, and fine chemical industries, the organized collection of fire-fighting wastewater and the prevention of fire spread through the drainage system are crucial safety considerations. In the event of a fire, flammable liquids leaking with fire-fighting water (flowing fire) can easily spread throughout the plant area through storm drains, inspection wells, and other facilities if they enter the drainage system, causing catastrophic consequences.

[0003] Currently, the rainwater and emergency water systems in most domestic factories are independently set up. While this approach achieves separation of clean and wastewater to some extent, it also brings many problems. First, the independent operation of the two systems requires the installation of two separate pipe networks, occupying a large amount of underground space and surface facilities land, resulting in high project costs. Second, conventional rainwater inlets, whether brick, reinforced concrete, resin concrete, or precast plastic structures, primarily function only to collect and discharge rainwater; they do not possess any water seal function and cannot prevent the leakage of flammable gases or the spread of flames. While cast-in-place reinforced concrete water seal wells, recommended by industry specifications and standard drawings, can serve as a water seal for oil separation, they are typically located downstream of the emergency wastewater discharge outlets in the plant or tank areas. They are large in size, are cast-in-place reinforced concrete structures, have long construction periods, and once built, their materials and structure are fixed, making them difficult to replace or maintain based on subsequent process adjustments or material characteristics.

[0004] To address the aforementioned issues, several improvements have emerged in the prior art. For instance, patent document CN212271180U discloses a "precast concrete rainwater inlet with a water seal," which reduces construction complexity to some extent by incorporating a reinforced concrete well shaft and stainless steel plates. However, the water seal structure in this solution is still tightly integrated with the well body and is not a completely independent modular unit, limiting its replaceability and adaptability. Another example is patent document CN212001501U, which proposes a "water-sealed oil-separated rainwater inlet" that achieves a water seal by setting up interconnected rainwater collection and drainage wells and installing a baffle between them. However, this structure is relatively complex, containing two well bodies, occupying a large area, and the installation and sealing methods of the baffle still need optimization. Furthermore, patents such as CN221663843U focus on the rainwater inlet's function of intercepting sewage and preventing odors; its structural design differs from the stringent water seal requirements for fire safety.

[0005] Therefore, the existing technology lacks a water-sealed rainwater inlet that can highly integrate rainwater harvesting and water seal functions, has a compact structure, can be modularly prefabricated, is easy to replace and maintain according to working conditions, and can effectively cope with fire accident conditions. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a water-sealed rainwater inlet and its preparation method. This inlet utilizes a guide rail to achieve modular and detachable installation of the water seal box, highly integrating rainwater collection and water sealing functions. It features small footprint, low investment, easy maintenance and replacement, flexible material selection, strong adaptability, and high safety. Its preparation method allows for factory prefabrication, convenient construction, and controllable quality, making it particularly suitable for fire-fighting wastewater collection and fire safety renovation in industries such as fine chemicals.

[0007] The above-mentioned objective of this invention is achieved through the following technical solutions: This invention provides a rainwater inlet with a water seal, comprising a well body, a rainwater grate, and a water seal assembly. The well body has an upward opening and a drain outlet located on the side wall. The rainwater grate is installed at the top opening of the well body. The water seal assembly is a detachable modular water seal box. A guide rail is vertically arranged on the inner side wall of the well body. The water seal box is provided with a guide structure that slides with the guide rail and is detachably installed in the well body through the guide structure. The bottom opening of the water seal box has an outlet on the upper part of its side facing the drain outlet. The outlet is positioned higher than the bottom of the water seal box to form a water seal.

[0008] According to one embodiment of the present invention, the guide rail is embedded in the concrete wall of the well body, and the guide structure is a protrusion provided on the outer wall of the water seal box.

[0009] According to one embodiment of the present invention, the water seal box is formed by four side panels and a top panel, and its bottom panel is completely open to form the bottom opening; the water outlet is provided on the side panel facing the drain outlet.

[0010] According to one embodiment of the present invention, the top of the water seal box is provided with at least one lifting handle.

[0011] According to one embodiment of the present invention, a seal is provided between the guide rail and the guide structure, and a sealant layer is coated between the top of the water seal box and the guide rail or well body.

[0012] According to one embodiment of the present invention, the effective water seal height of the water seal box, that is, the vertical distance from the bottom of the water seal box to the bottom edge of the outlet, can be adjusted.

[0013] According to one embodiment of the present invention, the water seal box is made of a corrosion-resistant material, which is stainless steel, reinforced polypropylene, polyvinyl chloride, polyethylene, or carbon steel with an anti-corrosion coating. The present invention also provides one such material.

[0014] According to one embodiment of the present invention, the well body is further covered with a concrete protective shell.

[0015] This invention also provides a method for preparing a water-sealed rainwater inlet, comprising the following steps: Step 1, Factory prefabrication of well body: The guide rail is pre-embedded and fixed in the mold of the well body, and concrete is poured to form a well body containing the pre-embedded guide rail; Step 2, Modular prefabrication of water seal boxes: The water seal boxes are prefabricated independently; Step 3, Assembly: The water seal box is slid into place along the guide rail inside the well body through its guide structure; Step 4, Install the rain grate: Install the rain grate on the top of the well body.

[0016] According to one embodiment of the present invention, after step three, the method further includes: applying sealant to the contact surface between the top of the water seal box and the guide rail or well body.

[0017] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects: Highly integrated, saving land and investment: The traditional water seal well function is integrated into the rainwater inlet, realizing dual use in one piece, greatly reducing the land area occupied by ground and underground facilities, and saving investment costs for civil construction and pipeline construction.

[0018] Modular design for easy maintenance and replacement: The core component, the water seal box, adopts a modular design, allowing for detachable connection to the well body via guide rails. When the water seal box is damaged due to long-term use, or when a change in factory manufacturing processes necessitates replacement with a corrosion-resistant material, the entire well body can be removed without destroying the entire well; simply remove the old water seal box and insert the new one. Maintenance costs are extremely low, and the process is convenient and quick.

[0019] Reliable sealing and high safety performance: Through the cooperation of guide rails and guide structures, supplemented by sealants and sealant, the sealing between the water seal box and the well body is ensured, eliminating short-circuit flow without water seal. The forced "bottom in, top out" water flow path and customizable water seal height can effectively isolate the escape of combustible gases and prevent the spread of flames through drainage pipes. Even under conditions exceeding design specifications, the water seal function remains, greatly improving fire safety.

[0020] Highly adaptable and with flexible material selection: The water seal box can be prefabricated using different corrosion-resistant materials depending on the chemical medium it comes into contact with, perfectly solving the problems of traditional water seal wells having limited material options and poor corrosion resistance. This allows the rainwater inlet to be widely used in various industries such as fine chemicals, pharmaceuticals, and petroleum.

[0021] Prefabricated production ensures controllable quality: Both the well body (including pre-embedded guide rails) and the water seal box can be prefabricated in the factory, ensuring standardized production, high precision, and guaranteed quality. On-site work only requires simple hoisting and assembly, reducing wet operations, shortening the construction period, and lowering on-site construction quality risks.

[0022] Convenient for renovation and suitable for upgrading old factories: For a large number of old factories with fire safety hazards, there is no need to remove the original rainwater inlets. Simply install the modular water seal box and matching guide rail of this invention into the existing rainwater inlets (simple modification or addition of guide rails is required) to quickly upgrade the water seal function, which greatly reduces the renovation cost and difficulty. Attached Figure Description

[0023] Figure 1 This is a simplified assembly structure diagram of the rainwater inlet with water seal in an embodiment of the present invention.

[0024] Figure 2 for Figure 1 The diagram shows a top view (plan view) of the rainwater inlet with a water seal.

[0025] Figure 3 for Figure 2 The cross-sectional view along line 1-1 shows the internal structure of the water seal box and the water flow path.

[0026] Figure 4 for Figure 2 The sectional view along line 2-2 shows the fit between the guide rail and the water seal box.

[0027] Attached reference numerals: 1. Well body; 2. Rainwater grate; 3. Water seal box; 4. Guide rail; 5. Drain outlet. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] This invention aims to solve the aforementioned problems in the prior art and provide a novel water-sealed rainwater inlet and its preparation method. Specifically, the technical problems to be solved include: This invention solves the problems of large footprint and high investment caused by the separate setting of traditional rainwater inlets and water seal wells, and realizes the integrated function of rainwater collection and water sealing.

[0032] To address the problems of complex structures and non-replaceable or difficult-to-replace water seal components in existing rainwater inlets with water seal functions, a modular, detachable, and easy-to-maintain water seal structure is provided.

[0033] This invention addresses the problem of traditional water seal wells using a single material, which cannot adapt to fire-fighting wastewater with different chemical properties. It enables water seal components to have a choice of materials, improving the system's corrosion resistance and applicability.

[0034] To address the issue that in fire accidents exceeding the design scale, wastewater may still spread through rainwater inlets, ensuring an effective water seal is formed under all circumstances to block the path of fire spread.

[0035] This provides a low-cost solution for the renovation of drainage systems in old factory areas, eliminating the need for large-scale excavation and reconstruction. The system can be safely upgraded simply by replacing or adding water seal modules.

[0036] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The present invention first provides a rainwater inlet with a water seal, including a well body 1, a rainwater grate 2 and a water seal assembly.

[0037] The well body 1 has an upward opening and a drain outlet 5 located on the side wall, which is used to connect a drainage pipe.

[0038] The rain grate 2 is detachably installed at the top opening of the well body 1 to intercept large debris and allow water to flow into the well body 1.

[0039] The water seal assembly is a modular water seal box 3 that can be independently prefabricated and disassembled. On the inner wall of the well body 1, at positions corresponding to the drain outlet 5, one or more pairs of guide rails 4 are vertically arranged. The water seal box 3 is detachably installed inside the well body 1 by slidingly engaging with the guide rails 4 through guide structures on both sides. When the water seal box 3 is installed in place, a cavity for storing the water seal liquid is formed inside. A water passage is formed between the bottom of the water seal box 3 and the bottom inner wall of the well body 1, and between the side of the water seal box 3 facing the drain outlet 5 and the side wall of the well body 1, connecting the upper space of the well body 1 and the drain outlet 5. The bottom of the water seal box 3 is open, allowing water from the well body 1 to enter the interior of the water seal box 3. The top of the water seal box 3 is closed or semi-closed, and an outlet is provided on the upper part of its side facing the drain outlet 5. The outlet is positioned higher than the bottom of the water seal box 3 to form a stable water seal layer inside the water seal box 3. After fire-fighting wastewater or rainwater enters the well body 1 through the rainwater grate 2, it must first flow downwards into the bottom opening of the water seal box 3, then upwards through the liquid layer inside the water seal box 3, and finally flow out from the side outlet into the drainage pipe, thereby achieving effective isolation of gas and flame.

[0040] In a preferred embodiment of the present invention, the guide rail 4 is a metal or plastic profile pre-embedded in the concrete inner wall of the well body 1, and its cross-section is "C", "T" or dovetail shaped. The guide structures on both sides of the water seal box 3 are protrusions or sliders that match the guide rail 4.

[0041] In a preferred embodiment of the present invention, the water seal box 3 is formed by four side panels and a top panel, with its bottom panel completely open to form a bottom opening; a water outlet is provided on the side panel facing the drain 5. This structure ensures that the water flow path must be "bottom in, top out", guaranteeing the water seal effect.

[0042] In a preferred embodiment of the present invention, the top of the water seal box 3 is provided with at least one lifting handle, which facilitates installation and disassembly maintenance by special tools or manual labor.

[0043] In a preferred embodiment of the present invention, a sealing element, such as a rubber gasket, is provided between the guide rail 4 and the guide structure of the water seal box 3. Simultaneously, a peelable sealant is applied between the top of the water seal box 3 and the top of the guide rail 4 or the well body 1 to achieve auxiliary fixing and sealing after installation, preventing liquids or gases that have not passed through the water seal from bypassing the flow.

[0044] In a preferred embodiment of the present invention, the effective water seal height of the water seal box 3, i.e., the vertical distance from the bottom of the water seal box 3 to the bottom edge of the outlet, is adjustable. By selecting modular water seal boxes 3 with different height specifications, or by adjusting the installation height of the water seal box 3 on the guide rail 4, different design water seal depth requirements (e.g., not less than 250mm, to meet specific safety specifications) can be accommodated.

[0045] In a preferred embodiment of the present invention, the water seal box 3 is made of a corrosion-resistant material, which is selected according to the characteristics of the materials discharged from the plant, including but not limited to stainless steel, reinforced polypropylene (FRPP), polyvinyl chloride (UPVC), polyethylene (PE), or carbon steel with an anti-corrosion coating. When the materials processed by the plant change, only the water seal box 3 of the appropriate material needs to be replaced, without modifying the entire well body 1.

[0046] In a preferred embodiment of the present invention, the well body 1 is further covered with a layer of concrete protective shell, which is cast integrally with the well body 1 or constructed separately, to enhance the structural strength of the well body 1 and its ability to resist external loads.

[0047] The present invention also provides a method for preparing any of the above-mentioned water-sealed rainwater inlets, characterized by comprising the following steps: Step 1, Factory prefabrication of well body 1: According to the design drawings, the mold of well body 1 is made. The guide rail 4 is precisely embedded and fixed in the mold corresponding to the position of the water seal box 3 to be installed. Then, concrete is poured to form a concrete well body 1 containing the embedded guide rail 4. Step 2, Modular prefabricated water seal box 3: According to the material and water seal height required by the design, multiple spare water seal boxes 3 are independently manufactured, and sealing components and lifting handles are installed on the water seal boxes 3; Step 3, on-site or factory assembly: The prefabricated water seal box 3 is slid vertically into the well body 1 along the guide rail 4 through its guide structure until it is installed in place; Step 4, Install rain grate 2: Install rain grate 2 on the top of well body 1; Step 5, sealing treatment: Apply sealant to the contact surface between the top of the water seal box 3 and the guide rail 4 or well body 1. Example

[0048] This embodiment provides a rainwater inlet with a water seal, the structure of which is as follows: Figures 1 to 4 As shown.

[0049] The water-sealed rainwater inlet mainly consists of a well body 1, a rainwater grate 2, and a detachable modular water seal box 3.

[0050] In this embodiment, the well body 1 is constructed using C30 reinforced concrete, either cast on-site or prefabricated in a factory. The well body 1 is generally rectangular or cylindrical in shape, with an upward-facing opening for collecting surface water. A circular drain outlet 5 is pre-installed on one side wall near the bottom, for connection to the factory's drainage pipes (not shown in the figure). During the casting of the well body 1, two parallel "C"-shaped stainless steel guide rails 4 are pre-embedded vertically on the side wall corresponding to the drain outlet 5. The openings of the guide rails 4 face each other, and their pre-embedded positions and verticality are precisely fixed using molds before casting to ensure the accuracy of subsequent installation.

[0051] The rain grate 2 is a standard component, typically made of ductile iron or composite materials, and has multiple drainage holes. The rain grate 2 is movably fitted onto the top opening of the well body 1, facilitating the passage of pedestrians and vehicles while intercepting large debris such as leaves and packaging materials.

[0052] The water seal box 3 is the most critical component of this invention. In this embodiment, considering the corrosion resistance requirements in a chemical environment, the water seal box 3 is welded from 316L stainless steel plate. Its structure is a bottomless cuboid box, consisting of four side panels and a top panel. The bottom panel is completely open, forming a bottom opening. Multiple elongated water outlets are provided on the side panels opposite the drain outlet 5 of the well body 1. The vertical distance between the bottom edge of these outlets and the bottom of the water seal box 3 itself is designed to be 250mm to meet the basic requirements of fire-fighting water seals. On each of the two opposite outer surfaces of the water seal box 3, a longitudinal convex strip matching the "C"-shaped guide rail 4 is welded, serving as a guide structure. Two stainless steel lifting rings are also welded to the top panel of the water seal box 3, serving as lifting handles for easy installation and disassembly. A layer of EPDM rubber sealing gasket is pre-attached to the surface of the guide structure as a sealing element.

[0053] During installation, first clean any debris from inside the well body 1. Then, lift the water seal box 3, aligning the guide strips on both sides with the openings of the "C"-shaped guide rails 4 on the well wall. Using its own weight, the water seal box 3 will slide smoothly down the guide rails 4 until its bottom touches the pre-set positioning block on the inner wall of the well bottom or falls directly to the bottom. At this point, the water seal box 3 is in place. After placement, a certain gap is maintained between the back of the water seal box 3 (i.e., the side with the outlet) and the side wall of the well body 1, and a certain space also exists between the bottom of the water seal box 3 and the inner wall of the well bottom. These two spaces, together with the internal cavity of the water seal box 3, form a meandering water passage. Finally, apply a layer of water-resistant, non-curing sealant to the contact surface between the top edge of the water seal box 3 and the top of the guide rail 4 or the inner wall of the well body 1, forming a sealant layer to further ensure that gas and liquid do not bypass the water seal box 3 from the top. Finally, cover it with the rain grate 2.

[0054] Its working principle is as follows: During normal rainfall or in the event of a fire, fire-fighting wastewater carrying flammable liquid flows into well 1 through rainwater grate 2. The water first accumulates at the bottom of well 1, and then enters the interior of water seal box 3 through its open bottom opening. As the water level rises, the liquid level inside water seal box 3 continuously increases. When the liquid level exceeds the bottom edge of the outlet (i.e., the 250mm water seal height), the water flows out from the outlet, enters the gap between water seal box 3 and the well wall, and finally flows into the downstream pipeline through drain outlet 5. During this process, a certain height of liquid is always maintained inside water seal box 3, forming a "liquid seal," which effectively isolates the flammable gas accumulation area in the downstream drainage pipeline from the upstream atmospheric environment. Even if an open flame on the ground attempts to ignite the gas in the pipeline, the flame cannot penetrate this 250mm high water layer, thus preventing the spread of fire. Example

[0055] This embodiment is basically the same as Embodiment 1, except that it is applied to the renovation of rainwater inlets in old factory areas.

[0056] A chemical plant previously had numerous brick-lined rainwater inlets that lacked water seal functionality, posing a safety hazard. This invention was used for their renovation. First, a custom-made plastic-lined well body (e.g., PE material) was created to match the inner diameter of the original rainwater inlets, and PVC guide rails were pre-embedded in the inner wall of this well body. Next, the bottom of the original rainwater inlets was cleaned, and the well body with guide rails was placed inside, secured to the original well wall with expansion bolts or a special adhesive. Then, based on the plant's existing material characteristics, a prefabricated water seal box made of reinforced polypropylene (FRPP) resistant to relevant chemical corrosion was selected. The dimensions of this water seal box matched the guide rails within the well body. The FRPP water seal box was slid into the well body along the guide rails, and the gaps between it and the bottom and side walls were checked. Finally, new, larger-sized rainwater grates were installed. The entire renovation process required no large-scale excavation, no prolonged production downtime, and quickly and economically upgraded the water seal functionality of the rainwater inlets. Example

[0057] This embodiment further optimizes the structure of the water seal box 3. Considering the varying requirements for water seal height under different operating conditions, such as certain specifications requiring a water seal depth of no less than 300mm, this embodiment provides an adjustable height solution. Specifically, the side panel of the water seal box 3 consists of upper and lower sections connected by flanges and bolts. By replacing the lower side panel with one of different heights, or by adding a height adjustment ring between the upper and lower sections, the distance between the outlet and the bottom of the water seal box 3 can be easily changed, thereby adjusting the effective water seal height. Correspondingly, the height of the guide rail 4 is also adaptively designed to meet the installation requirements of water seal boxes of different heights. Example

[0058] This embodiment provides a method for preparing a rainwater inlet with a water seal. This method is used to prepare the rainwater inlet described in any one of Embodiments 1 to 3, and specifically includes the following steps: Well body prefabrication and guide rail pre-embedding: According to the design drawings, make steel or wooden inner and outer molds for well body 1.

[0059] On the side wall of the inner mold, accurately mark the position where the guide rail 4 needs to be installed.

[0060] The rust-removed and corrosion-resistant C-shaped stainless steel guide rail 4 is fixed in the designated position within the mold using welding or bolting. Temporary support rods can be used to reinforce the guide rail to ensure accuracy.

[0061] Pour the prepared C30 concrete and vibrate it to ensure that the concrete is densely filled between the mold and the guide rail, and to remove air bubbles.

[0062] After standard curing, the formwork is removed once the concrete reaches the design strength, resulting in a concrete well body 1 with guide rails 4 precisely embedded in the inner wall.

[0063] Modular prefabrication of water seal boxes: According to the order requirements, select the specified corrosion-resistant sheet material (such as 316L stainless steel, FRPP, UPVC, etc.) for cutting.

[0064] The four side panels and one top panel are assembled by welding or hot-melt to form a bottomless box. Drain outlets are cut into the side panels facing the drain according to the designed height and dimensions.

[0065] On the outer sides of the two side panels of the water seal box, guide ridges that match the guide rail 4 are welded or integrally formed.

[0066] EPDM rubber sealing gaskets are attached to the surface of the guide convex strip.

[0067] Install a lifting handle on the top panel.

[0068] The prefabricated water seal box 3 was inspected for its appearance and dimensions and tested for its sealing performance.

[0069] On-site or factory assembly: The prefabricated well body 1 is hoisted to the designed position and the drainage pipe is connected.

[0070] The prefabricated water seal box 3 is vertically lifted, and its guide strip is aligned with the guide rail 4 inside the well body 1. The water seal box 3 is then slowly and steadily slid into the well body 1 until its bottom touches the preset support point at the bottom of the well.

[0071] Sealing and finishing: Clean the dust and moisture from the junction of the top of the water seal box 3 with the guide rail 4 and the inner wall of the well body 1.

[0072] A high-performance sealant is evenly applied to the joint to form a sealant layer.

[0073] Install a rainwater grate 2 on the top of well body 1.

[0074] For rainwater inlets located under the roadway, a layer of concrete protective shell is poured around the outside of the well body 1 to improve its load-bearing capacity.

[0075] The implementation principle of this invention is as follows: This invention discloses a rainwater inlet with a water seal and its preparation method, belonging to the technical field of drainage collection and water seal equipment. It aims to solve the problems of large footprint, high investment, and non-replaceable water seal structure with poor adaptability in existing technologies where the rainwater inlet and water seal well are separated. The rainwater inlet with a water seal includes a well body 1, a rainwater grate 2, and a water seal assembly; a guide rail 4 is vertically arranged on the inner wall of the well body 1; the water seal assembly is a detachable modular water seal box 3, which has a guide structure that slides with the guide rail 4; the bottom of the water seal box 3 is open, and an outlet is opened on the upper part of its side facing the drainage outlet 5 of the well body 1. This invention achieves modular and detachable installation of the water seal box 3 through the guide rail 4, highly integrating rainwater collection and water seal functions, and has the characteristics of small footprint, low investment, easy maintenance and replacement, flexible material selection, strong adaptability, and high safety. Its preparation method can achieve factory prefabrication, convenient construction, and controllable quality, and is particularly suitable for fire wastewater collection and fire safety renovation in industries such as fine chemicals.

[0076] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A rainwater inlet with a water seal, comprising a well body (1), a rainwater grate (2), and a water seal assembly, wherein the well body (1) has an upward opening and a drain outlet (5) located on the side wall, and the rainwater grate (2) is installed at the top opening of the well body (1), characterized in that, The water seal assembly is a detachable modular water seal box (3); a guide rail (4) is vertically arranged on the inner wall of the well body (1); the water seal box (3) is provided with a guide structure that slides with the guide rail (4), and is detachably installed in the well body (1) through the guide structure; the bottom opening of the water seal box (3) has an outlet on the upper part of its side facing the drain outlet (5), and the outlet is higher than the bottom of the water seal box (3) to form a water seal.

2. A rainwater inlet with a water seal according to claim 1, characterized in that, The guide rail (4) is embedded in the concrete wall of the well body (1), and the guide structure is a protrusion on the outer wall of the water seal box (3).

3. A water-sealed rainwater inlet according to claim 1, characterized in that, The water seal box (3) is formed by four side panels and a top panel, and its bottom panel is completely open to form the bottom opening; The outlet is provided on the side panel facing the drain (5).

4. A water-sealed rainwater inlet according to claim 1, characterized in that, The top of the water seal box (3) is provided with at least one lifting handle.

5. A water-sealed rainwater inlet according to claim 1, characterized in that, A seal is provided between the guide rail (4) and the guide structure, and a sealant layer is coated between the top of the water seal box (3) and the guide rail (4) or the well body (1).

6. A rainwater inlet with a water seal according to claim 1, characterized in that, The effective water seal height of the water seal box (3), that is, the vertical distance from the bottom of the water seal box (3) to the bottom edge of the outlet, can be adjusted.

7. A rainwater inlet with a water seal according to claim 1, characterized in that, The water seal box (3) is made of a corrosion-resistant material, which is one of stainless steel, reinforced polypropylene, polyvinyl chloride, polyethylene, or carbon steel with an anti-corrosion coating.

8. A rainwater inlet with a water seal according to claim 1, characterized in that, The well body (1) is also covered with a concrete protective shell.

9. A method for preparing a water-sealed rainwater inlet as described in any one of claims 1 to 8, characterized in that, Includes the following steps: Step 1, Factory prefabrication of well body: The guide rail (4) is pre-embedded and fixed in the mold of well body (1), and concrete is poured to form well body (1) containing the pre-embedded guide rail (4); Step 2, Modular prefabrication of water seal boxes: The water seal boxes (3) are prefabricated independently; Step 3, Assembly: The water seal box (3) is slid into place along the guide rail (4) inside the well body (1) through its guide structure; Step 4, Install the rain grate (2): Install the rain grate (2) on the top of the well body (1).

10. The method for preparing a water-sealed rainwater inlet according to claim 9, characterized in that, Step three is followed by applying sealant to the contact surface between the top of the water seal box (3) and the guide rail (4) or the well body (1).

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