Expanded insect-proof rainwater screen with double-plate closing structure
The expandable insect-proof rain grate, with its double-plate closed structure and tension spring design, solves the problem of balancing drainage and insect prevention in traditional rain grate systems, achieving stable and reliable drainage and low-cost installation adaptability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 广西苓治生态工程有限公司
- Filing Date
- 2025-09-15
- Publication Date
- 2026-06-16
AI Technical Summary
Traditional rain grates are difficult to design to balance drainage efficiency and insect prevention, as they need to ensure rapid drainage of large volumes of water while preventing flying insects from overflowing when the water volume is small.
The expandable insect-proof rain grate adopts a double-plate closure structure. The symmetrical closure design of the two closing plates and tension springs ensures that it is sealed to prevent insects when the water volume is small and automatically opens to drain water when the water volume is large, achieving efficient drainage through the expansion port.
It effectively prevents flying insects from overflowing in small water volumes and drains water quickly in large water volumes. It also has a stable structure, making it suitable for both new construction and renovation projects, and reducing installation and maintenance costs.
Smart Images
Figure CN224363425U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of municipal engineering drainage facilities, specifically relating to an expandable insect-proof rain grate with a double-plate closed structure, suitable for rainwater drainage in urban roads, residential areas, parks and squares, etc. In particular, it provides a stable and reliable technical solution to the problems of easy failure of the closed structure of traditional rain grate and difficulty in achieving both insect prevention and drainage. Background Technology
[0002] As a core component of municipal drainage systems, storm drain grates function to intercept debris and guide rainwater into sewers. Traditional storm drain grates suffer from a contradiction: their "drainage-insect prevention" functions are contradictory. If large gaps / mesh openings are designed to ensure drainage efficiency, cockroaches, mosquitoes, and other flying insects can easily overflow from the sewers; conversely, if the gaps / mesh openings are reduced to prevent insects, small volumes of water drain slowly, while large volumes are prone to clogging. Therefore, there is an urgent need for a storm drain grate with a stable closed structure that balances drainage and insect prevention, and is highly adaptable. Utility Model Content
[0003] This utility model aims to overcome the defects of traditional rain grate and provide an expansion-type insect-proof rain grate with a double-plate closing structure. The symmetrical closing structure of two closing plates and inter-plate tension springs improves the sealing stability. At the same time, it can prevent insects with small water volume and drain water efficiently with large water volume, making it suitable for new construction and renovation scenarios and reducing installation and maintenance costs.
[0004] To achieve the above objectives, this utility model provides the following technical solution: an expandable insect-proof rain grate with a double-plate closure structure, comprising: a rain grate body; an expansion opening disposed on the drainage path of the rain grate body, the expansion opening having a "larger at the top and smaller at the bottom" structure, the upper opening size being adapted to the drainage outlet size of a traditional rain grate, and the lower part being provided with an expansion closure member; the expansion closure member being composed of two closure plates, the edges of both closure plates being provided with insect-proof sealing edges for blocking flying insects; and a tension spring. It is fixedly connected between the two closing plates to provide a normal closing force for the two closing plates; when there is no rain or a small amount of water, the two closing plates are in a tightly closed state under the action of the tension spring, and the insect-proof sealing edge blocks the passage for flying insects in the sewer; when the water volume exceeds the leakage of the expansion port or the closing plate, the water flow impact force overcomes the tension of the tension spring and pushes open the two closing plates to achieve large-flow drainage; after the water volume decreases, the tension spring drives the two closing plates to reset and close tightly.
[0005] The expansion port is an independent structure, and the size of the expansion port is adapted to the size of a single drain outlet of the rainwater grate. Each drain outlet corresponds to one independent expansion port.
[0006] The expansion port is an integral frame structure, which is composed of multiple expansion devices with expansion and closure components connected together. Each rain grate is equipped with one integral frame expansion port.
[0007] The frame of the expansion port and the two closing plates are made of corrosion-resistant metal or plastic materials.
[0008] Both closed plates are either perforated mesh components, or both are non-perforated sheet components, or one is a perforated mesh component and the other is a non-perforated sheet component.
[0009] There is at least one tension spring, which is symmetrically distributed at the connection point of the two closed plates.
[0010] The expansion port and the main body of the rain grate are pre-assembled into a single structure in the factory in a standardized manner.
[0011] The expansion opening is custom-made on-site according to the size of the old rain grate and is installed and fixed on-site to the old rain grate body using bolts or clips.
[0012] Overall structure: includes the rain grate body, the expansion double-plate closing component and the tension spring; the expansion double-plate closing component is located on the drainage path below the grate body, with a variable diameter structure of larger at the top and smaller at the bottom, and the upper opening is consistent with the size of the traditional grate drainage outlet to ensure compatibility with existing drainage systems; the double-plate closing component is the core component at the bottom of the expansion outlet, and the tension spring connects the two closing plates to form a symmetrical force structure.
[0013] Double-plate closure component and tension spring: The two closure plates are matched in size, and both edges are equipped with insect-proof sealing edges (made of rubber or silicone material, 3-5mm thick) to ensure no flying insects can pass through when tightly closed; the tension spring is fixed in the middle or symmetrical sides of the two closure plates (1-2 in number, depending on the size of the closure plates) to provide uniform closing force; the closure plate type can be selected as follows: ① Both are small-hole mesh (mesh diameter ≤3mm, allowing a small amount of water seepage and preventing water accumulation); ② Both are non-porous plates (suitable for areas with both flying insects and odor); ③ One plate is mesh and the other is non-porous (suitable for complex drainage scenarios).
[0014] Working principle: When there is no rain or a small amount of water, the tension spring keeps the two closing plates symmetrically and tightly closed, and the insect-proof sealing edge fits tightly, preventing flying insects from flying out; when the water volume exceeds the gap of the expansion port or the leakage of the closing plate, the water flow impact force is evenly applied to the inner side of the two closing plates, overcoming the tension spring force and pushing the two closing plates to open to both sides, and rainwater is quickly discharged into the sewer through the expansion port that is larger at the top and smaller at the bottom; when the rain stops or the water volume decreases, the water flow impact force disappears, and the tension spring drives the two closing plates to symmetrically reset and re-close to prevent insects.
[0015] Expansion port type:
[0016] Independent type: Each expansion port corresponds to a single drainage port of the grate (such as a 200mm×200mm drainage port of a community walkway grate), with each port equipped with an independent expansion port, suitable for small drainage scenarios.
[0017] Integral frame type: Multiple expansion devices with double-plate closing components are connected to form a frame (e.g., a 600mm×600mm frame contains 4 expansion devices), and one large grate (main road grate) is installed for each grate, improving installation efficiency.
[0018] Material selection: The expansion frame and closing plate are made of 304 stainless steel (corrosion resistant, high strength, suitable for heavy-load scenarios such as roads) or modified PP plastic (lightweight, low cost, suitable for light-load scenarios such as residential areas and parks); the tension spring is made of galvanized alloy spring, which is rust resistant and has a service life of ≥5 years.
[0019] Installation method:
[0020] New project: The factory pre-assembles the expansion opening, double-plate closing components, tension springs and grate body into one unit, which can be directly laid on site without secondary assembly.
[0021] Urban renewal projects: On-site measurement of the old grate drain outlet size, custom-made expansion openings, and fixing the expansion openings to the bottom of the old grate using 4-6 M6 bolts or clip structures, eliminating the need to remove the old grate and reducing construction time by more than 50%. Beneficial effects
[0022] (1) Stable closed structure: The symmetrical design of "double plate + inter-plate tension spring" ensures uniform force distribution, avoids plate offset, and reduces maintenance frequency.
[0023] (2) It combines drainage and insect prevention: it can be tightly closed to prevent insects when the water volume is small, and automatically open to drain when the water volume is large, thus solving the functional contradiction of traditional grates. The drainage flow rate can reach 100% of the design value.
[0024] (3) Strong adaptability: It supports factory pre-installation and on-site customization for old renovations. There is no need to replace the old grate as a whole, reducing construction costs by 30%-40%.
[0025] (4) Wide scene adaptability: The closed plate can be combined in various forms to meet the drainage and insect prevention needs of different scenes such as communities, roads, and parks.
[0026] (5) Simple structure: No complex external parts, easy to manufacture and process, suitable for mass promotion. Attached Figure Description
[0027] Figure 1 Assembly drawing of the overall structure of this utility model.
[0028] 1. Rain grate body; 2. Expanded double-plate closing component; 3. Tension spring. Detailed Implementation
[0029] Example 1: Independent, expandable insect-proof rain grate with double-plate closure structure
[0030] Applicable scenarios: residential walkways, park paths, rain grate size 300mm×300mm, single drain outlet size 200mm×200mm.
[0031] Expansion port structure: Independent expansion port, with an upper opening of 200mm×200mm, and a lower double-plate closing component: Both closing plates are 304 stainless steel perforated mesh plates (size 200mm×100mm, mesh diameter 2mm), with rubber insect-proof sealing edges (thickness 4mm); The tension spring is a galvanized compression tension spring (diameter 6mm, free length 25mm, elastic force 6N-8N), fixed in the middle of the two mesh plates.
[0032] Installation method: Measure the size of the old grate drain outlet on-site in the old city renovation project in Xiufeng District, Guilin City, customize an independent expansion port, and fix the expansion port frame to the edge of the drain outlet below the old grate with 4 M6 bolts.
[0033] Working process: When there is no rain, the tension spring keeps the two mesh panels tightly closed, and the sealed edges block flying insects; during light rain, rainwater slowly seeps through the mesh holes, and the mesh panels remain tightly closed; during heavy rain, the impact force of the water flow pushes the two mesh panels open, and the rainwater drains quickly; after the rain stops, the tension spring drives the mesh panels to reset and close tightly.
[0034] Example 2: An expansion-type insect-proof rain grate with an integral frame and double-plate closed structure.
[0035] Applicable scenarios: On main urban roads, the storm drain grate is 600mm×600mm in size and includes 4 drainage outlets (each 150mm×150mm).
[0036] Expansion port structure: The expansion port is an integral frame type (600mm×600mm), which integrates 4 expansion devices. Each device has a double-plate closing component: the two closing plates are modified PP non-porous plates (150mm×75mm), with silicone sealing edges (5mm thick); each device is equipped with 2 galvanized tension springs (5mm diameter, 20mm free length, 5N-7N elastic force), which are symmetrically fixed on both sides of the two plates.
[0037] Installation method: For new projects, the entire frame expansion opening is welded to the metal grate body and then laid directly on the ground above the drainage well.
[0038] Working process: When there is no rain, the double plates of all four devices are tightly closed; during heavy rain or flooding, all double plates open; after the rain stops, the tension springs drive the double plates to reset.
Claims
1. An expandable insect-proof rain grate with a double-plate closed structure, characterized in that, include: Rainwater grate body; An expansion port is located on the drainage path of the rain grate body. The expansion port has a "larger at the top and smaller at the bottom" structure. The upper opening size is adapted to the drainage outlet size of a traditional rain grate, and the lower part is provided with an expansion closing member. The expansion closing member consists of two closing plates, and the edges of the two closing plates are provided with insect-proof sealing edges to block flying insects. A tension spring is fixedly connected between the two closing plates to provide a normal closing force for the two closing plates. When there is no rain or a small amount of water, the two closing plates are in a tightly closed state under the force of the tension spring, and the insect-proof sealing edges block the passage for flying insects out of the sewer. When the water volume exceeds the gap of the expansion port or the leakage of the closing plates, the impact force of the water flow overcomes the tension of the tension spring and pushes open the two closing plates to achieve high-flow drainage. After the water volume decreases, the tension spring drives the two closing plates to reset and close tightly.
2. The expandable insect-proof rain grate with a double-plate closed structure according to claim 1, characterized in that, The expansion port is an independent structure, and the size of the expansion port is adapted to the size of a single drain outlet of the rainwater grate. Each drain outlet corresponds to one independent expansion port.
3. The expandable insect-proof rain grate with a double-plate closed structure according to claim 1, characterized in that, The expansion port is an integral frame structure, which is composed of multiple expansion devices with expansion and closure components connected together. Each rain grate is equipped with one integral frame expansion port.
4. The expandable insect-proof rain grate with a double-plate closed structure according to claim 1, characterized in that, The frame of the expansion port and the two closing plates are made of corrosion-resistant metal or plastic materials.
5. The expandable insect-proof rain grate with a double-plate closed structure according to claim 1, characterized in that, Both closed plates are either perforated mesh components, or both are non-perforated sheet components, or one is a perforated mesh component and the other is a non-perforated sheet component.
6. The expandable insect-proof rain grate with a double-plate closed structure according to claim 1, characterized in that, There is at least one tension spring, which is symmetrically distributed at the connection point of the two closed plates.
7. The expandable insect-proof rain grate with a double-plate closed structure according to claim 1, characterized in that, The expansion port and the main body of the rain grate are pre-assembled into a single structure in the factory in a standardized manner.
8. The expandable insect-proof rain grate with a double-plate closed structure according to claim 1, characterized in that, The expansion opening is custom-made on-site according to the size of the old rain grate and is installed and fixed on-site to the old rain grate body using bolts or clips.