A flexible, retractable insect cage adapted to rain grate

Abstract

This utility model discloses a flexible retractable insect-proof cage adapted to rainwater grates, belonging to the field of municipal drainage insect-proof technology. It includes a flexible small-hole mesh bag, an upper retaining rib, and a lower retractable retaining rib. The mesh bag is cylindrical with openings at both ends. The upper mounting opening adapts to the rainwater grate drain outlet and is compatible with dimensional deviations of ±10mm. The lower drain outlet is normally closed by the lower retractable retaining rib. When there is no rain, the lower drain outlet is tightly closed to prevent insects; when the water volume increases, the water flow opens the lower drain outlet to achieve high-flow drainage, and it automatically resets and closes again when the water volume decreases. This device is highly flexible and adaptable, requires no modification to the old grate for installation, automatically balances insect-proofing and drainage efficiency, has a simple structure, low cost, and is easy to maintain.

Description

Technical Field

[0001] This utility model belongs to the technical field of insect-proof accessories for municipal engineering drainage facilities. Specifically, it relates to a flexible retractable insect-proof cage that adapts to rainwater grates. It is suitable for the insect-proofing renovation of traditional rainwater grates and the insect-proofing matching of newly built rainwater grates in urban roads, residential areas, parks, squares, industrial parks and other scenarios. In particular, it provides a flexible, easy-to-install, and self-adaptive technical solution to address the problems of poor adaptability of traditional rigid insect-proof nets, the need to dismantle and modify old grates for installation, and the conflict between insect-proofing and drainage functions. Background Technology

[0002] As a key component of municipal drainage systems, the insect-proof performance of storm drain grates directly impacts the hygiene and safety of the surrounding environment. Current traditional insect-proofing solutions for storm drain grates suffer from several drawbacks: they require custom manufacturing, resulting in long installation cycles and high costs; functional conflicts exist: rigid insect-proof nets require small apertures to ensure insect control, making them prone to clogging by fallen leaves and sediment, leading to slow drainage in small volumes and water accumulation in large volumes; increasing the aperture size negates the insect-proofing effect, making it difficult to balance insect control and drainage efficiency; and maintenance is difficult: if a rigid insect-proof net becomes clogged after installation, the entire net must be disassembled for cleaning, which is cumbersome and costly. Therefore, there is an urgent need for a storm drain grate insect-proofing accessory that combines flexibility, automatic retraction for insect prevention, and ease of installation and maintenance. Utility Model Content

[0003] 1. Purpose of the utility model

[0004] This utility model aims to overcome the shortcomings of existing rain grate insect prevention solutions and provides a flexible, retractable insect cage adapted to rain grate. Through the structural design of "flexible small-hole mesh bag + double-group retractable reinforcing bars", it achieves: ① flexible adaptation to rain grate of different sizes without the need to dismantle or modify the old grate; ② automatic response to changes in water volume, closing tightly to prevent insects when the water volume is small and expanding to drain when the water volume is large; ③ simple structure, convenient installation and maintenance, reducing construction and operation costs.

[0005] 2. Technical Solution

[0006] The core technical solution of this utility model is as follows:

[0007] Overall structure: Includes a flexible perforated mesh bag, an upper tightening reinforcing bar, and a lower contracting reinforcing bar, with auxiliary fixing buckles added if necessary; the flexible perforated mesh bag has a cylindrical structure, with the upper and lower openings corresponding to the rainwater grate drain outlet and the sewer inlet, respectively. The double set of contracting reinforcing bars achieves the dual function of "fixing + closing", and the auxiliary fixing buckles enhance the stability of the mesh bag.

[0008] Flexible perforated mesh bag design:

[0009] Material selection: Flexible mesh is used, with a wire diameter of 0.3-0.5mm, which combines corrosion resistance with flexible stretchable deformation to accommodate dimensional deviations of ±10mm;

[0010] Mesh parameters: Mesh diameter 1-3mm (preferably 2mm), which can block flying insects such as cockroaches and mosquitoes, while allowing a small amount of water to seep in, thus preventing water accumulation inside the mesh bag from breeding mosquitoes;

[0011] Size compatibility: The initial unfolded size of the upper installation opening matches that of traditional rain grate drain outlets, and the mesh bag height is 150-300mm; it can be adapted to various rain grate drain outlet shapes such as round, square, and rectangular.

[0012] Reinforcement structure: The upper installation opening edge is reinforced with a 10-15mm wide edging, which is made of the same material as the mesh bag and is fixed by sewing or heat pressing to prevent the upper tightening tendon from pulling and causing damage to the mesh edge.

[0013] Shrinkable elastic design:

[0014] Material and performance: Made of natural rubber or neoprene rubber, with a cross-sectional diameter of 3-5mm, an elongation at break of ≥300%, a resilience of ≥90%, excellent aging resistance, and no failure for outdoor use for ≥3 years;

[0015] Distribution and Fixing: The upper tightening reinforcing bar is embedded in the reinforcing edging of the upper installation opening and fixed by needle and thread sewing or metal buckles to ensure that it will not slip when tightening; the lower shrinking reinforcing bar is directly circumferentially sewn to the edge of the lower drain outlet to ensure uniform shrinkage force;

[0016] Elasticity matching: The normal elasticity of the upper tightening tendon is 8-12N, ensuring that it is tightly fastened under the rain grate and does not loosen. The normal elasticity of the lower contraction tendon is 5-8N, which can ensure that it is tightly closed when there is no rain, and can also be pushed open by the impact force of water flow ≥4L / min.

[0017] Auxiliary fixing buckle design:

[0018] Structure: Uses 4-8 "C" shaped buckles made of plastic or metal, the number of which can be adjusted according to the diameter of the mesh bag, and fixed at intervals on the upper side wall of the mesh bag;

[0019] Function: During installation, the auxiliary fixing buckle is fastened to the support frame of the rain grate to prevent the mesh bag from shifting laterally under the impact of large water flow and to ensure the stability of the expansion direction of the drainage outlet.

[0020] Working principle:

[0021] In low-water-volume, no-rain condition: the lower retractable tendon is in its normal contracted state, pulling the edge of the drain outlet tightly to form a sealed structure, preventing flying insects from overflowing through the mesh bag; at the same time, a small amount of rainwater slowly seeps through the mesh, preventing water from accumulating inside the mesh bag;

[0022] Heavy rain: Rainwater flows into the mesh bag through the rain grate. The water flow creates a certain pressure inside the mesh bag. The impact force overcomes the elasticity of the lower constricting tendon, pushing the lower drain outlet to expand outward, forming a smooth drainage channel. The drainage flow rate can reach more than 95% of the design flow rate of traditional rain grate.

[0023] Reduced water volume / Rain stopped state: When the water volume flowing into the mesh bag decreases to the point where the water flow impact force disappears, the lower contraction tendon, with its rebound energy, pulls the edge of the lower drain outlet back to its original position, forming a tight seal again and restoring the insect-proof function.

[0024] Installation method:

[0025] Installation procedures for urban renewal projects: ① Measure the shape, size, and height of the drainage outlet of the old storm drain grate on-site; ② Cut flexible mesh bags with small holes according to the measurement data, process the upper installation opening and the lower drainage opening, embed the shrink-fit reinforcing bars, and fix the auxiliary fixing buckles; ③ Align the upper installation opening of the mesh bag with the drainage outlet of the old grate, stretch the upper tightening reinforcing bars to make it tightly bound to the lower edge of the grate, and then fasten the auxiliary fixing buckles to the grate support frame; ④ Check whether the lower drainage opening is tightly closed, and the installation is complete;

[0026] Installation for new projects: ① Prefabricate flexible retractable insect cages in advance according to the standard dimensions of the new rain grate; ② Before the rain grate leaves the factory, pre-tighten the upper installation opening of the insect cage to the bottom of the grate with upper tightening tendons to form an integrated structure; ③ When laying the rain grate on site, there is no need to install insect cages separately, and the drainage system construction can be completed directly.

[0027] 3. Beneficial effects

[0028] (1) High flexibility and adaptability: The deformable properties of the mesh bag are compatible with a size deviation of ±10mm, eliminating the need for customization for different rainwater grates. Old grates do not need to be removed in renovation projects, improving the adaptation efficiency by 80% and reducing construction costs by 40%-50%.

[0029] (2) Automatic opening and closing to prevent conflict: The drain outlet opens and closes automatically according to the water volume. It closes tightly to prevent insects when the water volume is small and expands to drain when the water volume is large, thus completely solving the contradiction between "water blockage" and "insect leakage" of traditional insect nets.

[0030] (3) Easy to install and maintain: The installation time for a single set is ≤10 minutes. When cleaning, simply stretch the reinforcing bar to remove the debris from the mesh bag. No tools are required, making operation and maintenance convenient and reducing maintenance costs by 60%.

[0031] (4) High durability: It is made of corrosion-resistant flexible materials and high-resilience tendons;

[0032] (5) Wide scene adaptability: Flexible mesh can be selected according to different scenarios, adapting to various drainage outlet shapes such as round, square, and rectangular, and the applicable range covers all types of rainwater grates. Detailed Implementation

[0033] Example 1: Flexible plastic mesh insect cage for rainwater grates on residential walkways

[0034] Applicable scenarios: rain grate for pedestrian walkways in residential areas, square drainage outlet, size 300mm×300mm, with a space height of 300mm below, no heavy-duty impact, mainly preventing flying insects such as mosquitoes and cockroaches;

[0035] Structural parameters:

[0036] Flexible perforated mesh bag: The material is modified PP flexible plastic mesh, with a wire diameter of 0.6mm, a mesh diameter of 2mm, a bag height of 200mm, an initial size of 300mm×300mm for the upper installation opening, and a 12mm wide PP reinforced edging on the upper edge;

[0037] Shrinkable reinforcing strip: One upper tightening reinforcing strip, neoprene rubber, 4mm in diameter, with a normal elasticity of 10N, is embedded in the reinforcing edging; one lower shrinkable reinforcing strip, neoprene rubber, 4mm in diameter, with a normal elasticity of 6N, is circumferentially sewn to the edge of the lower drain outlet;

[0038] Auxiliary fastening buckles: 8 C-shaped buckles made of PP material, fixed to the upper side wall of the mesh bag;

[0039] Installation process:

[0040] ① The size of the old grate drain outlet was measured on-site to be 300mm×300mm (deviation + 5mm). PP mesh bags were cut and reinforced with edging.

[0041] ②Insert upper tightening tendons and lower contraction tendons to fix 8 auxiliary fixing buckles;

[0042] ③Stretch the upper hoops and tighten the reinforcing bars, then tighten the installation opening of the mesh bag to the lower edge of the old grate, and fasten the auxiliary fixing buckle under the grate;

[0043] Work status:

[0044] When there is no rain: the drain outlet is tightly closed, and the insect-proof seal is good;

[0045] Light rain and small water: Rainwater seeps through the mesh, and the drain outlet is kept tightly closed;

[0046] Heavy rainfall and large water volume: Under the impact of water flow, the drainage outlets expand, and drainage is smooth;

[0047] After the rain is light and the water level is low: the lower retractable tendon drives the lower drain outlet to immediately reset and close tightly. Attached Figure Description

[0048] Figure 1: Schematic diagram of the overall structure of this utility model

[0049] 1. Rain grate; 2. Upper tightening braided installation opening; 3. Flexible leak-proof and insect-proof mesh bag; 4. Lower retractable braided drainage outlet.

Claims

1. A flexible retractable insect-proof screen adapted to a rainwater gutter, characterized in that, include: A flexible perforated mesh bag, which is a cylindrical structure with openings at both ends. The upper opening is the upper mounting port, and the lower opening is the lower drain outlet. The initial unfolded size of the upper mounting port is adapted to the drain outlet size of a traditional rain grate, and the flexible perforated mesh bag has deformable characteristics, which can accommodate the dimensional deviation of the rain grate drain outlet within ±10mm; two sets of shrinkage reinforcing bars, namely an upper tightening reinforcing bar and a lower shrinkage reinforcing bar; The upper tightening reinforcing bar is circumferentially fixed along the edge of the upper mounting opening, used to tightly fix the flexible perforated mesh bag to the bottom of the rain grate; the lower contraction reinforcing bar is circumferentially fixed along the edge of the lower drain outlet, used to provide the lower drain outlet with normal contraction and closing force; under no rain or low water conditions, the lower drain outlet is in a tightly closed state under the elastic force of the lower contraction reinforcing bar, blocking the passage for flying insects in the sewer. When the water volume exceeds the leakage of the flexible perforated mesh bag, the impact force of the water flow overcomes the elasticity of the lower contraction tendon, causing the lower drain outlet to expand outward to form a drainage channel. Once the water volume decreases to below the leakage rate of the mesh, the lower retractable tendon drives the lower drain outlet to reset and close tightly.

2. The flexible retractable insect-proof screen with an adapted rain screen according to claim 1, characterized in that, The flexible perforated mesh bag has a mesh diameter of 1-3mm, is made of corrosion-resistant flexible mesh, and has a wire diameter of 0.3-0.5mm.

3. The flexible retractable insect-proof screen with an adapted rain screen according to claim 1, wherein, The cross-sectional diameter of the upper tightening tendon and the lower contracting tendon is 3-5mm, and the material is natural rubber or neoprene rubber, with a minimum of one of each.

4. The flexible retractable insect-proof screen with an adapted rain screen according to claim 1, wherein, The flexible perforated mesh bag can be cut and processed on-site according to the size of the rain grate drain outlet. The drain outlet shape includes round, square, and rectangular, and it can be installed and used without removing the old rain grate.

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