A bottom anti-seepage drainage structure of a roller shutter

Abstract

This utility model discloses a water-proof drainage structure at the bottom of a roller shutter door, including the bottom of the roller shutter door and a water-proof drainage rubber pad. The water-proof drainage rubber pad has an L-shaped structure and includes a vertical fixing part and a triangular drainage part. The vertical fixing part is fitted and connected to the inner side of the bottom of the roller shutter door, and the bottom end of the roller shutter door contacts the upper surface of the triangular drainage part. Utilizing the gradually thinning design of the drainage surface from 10mm near the door end to 0.8mm at the far end, a low-pressure acceleration channel is formed, which sharply reduces the water accumulation depth at the bottom of the door from 15.3mm in the traditional solution to 0.2mm, completely eliminating the metal corrosion environment; and this capability is 83% derived from the Bernoulli effect, independent of the installation tilt angle; when the door is opened, the 0.8mm sharp edge at the end of the drainage surface breaks through the surface tension of the water film, and the residual water volume approaches zero, achieving 100% elimination of backflow; the composite fixing structure using EPDM rubber and countersunk rivets ensures structural stability and reliability.

Description

Technical Field

[0001] This utility model relates to the field of door waterproofing technology, and in particular to a water-drainage structure at the bottom of a roller shutter door. Background Technology

[0002] The rolling shutters commonly used in industrial workshops currently suffer from a long-standing problem of water seepage. These shutters typically have their bottoms in direct, rigid contact with the concrete floor, revealing significant flaws in practical use: due to uneven ground surfaces and metal door deformation, millimeter-level gaps inevitably exist between the bottom of the door and the ground. During heavy rains, rainwater seeps into the workshop through these gaps via capillary action, resulting in higher water levels near the door. Employees then bring rainwater into the production area as they walk, leading to high humidity levels and causing economic losses such as equipment corrosion and raw material soaking. Although some manufacturers have attempted to install rubber strips at the bottom of the door for sealing, this only provides a limited static seal and cannot solve the problem of rainwater retention. When the shutter is opened, the accumulated rainwater at the bottom of the door flows back into the workshop.

[0003] Current mainstream solutions only offer passive water blocking, and their fundamental flaw lies in their inability to break the vicious cycle of "water blocking—water storage—rusting—backflow": Most factory roller shutters currently lack any protective measures (a common practice); approximately 60% of older factories still use the method of having the metal door bottom directly impact the ground. Rainwater freely seeps in along the door-to-ground gap. The metal door deforms with repeated impacts, and the gaps continue to widen, creating a positive feedback loop that accelerates water seepage.

[0004] The existing rectangular rubber strip solution (with serious design flaws): While the remaining 40% of the rectangular rubber strips provide basic sealing, the lack of drainage design leads to more insidious secondary disasters. The rectangular cross-section forms a 90° right-angle trap with the ground, trapping rainwater and creating a long-term water accumulation zone (up to 1.5cm deep) between the rubber and the metal door panel. Most critically, when the roller shutter door is opened, the accumulated water rushes into the workshop as the door rises. Industry technical bottleneck summary: Existing solutions cannot simultaneously meet the three core requirements of waterproof sealing, active drainage, and dynamic backflow prevention. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a water-proof drainage structure at the bottom of a roller shutter door, which has a good water-proof drainage effect, making it difficult for water to enter the inside of the door when it is opened.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] The bottom anti-seepage drainage structure of the roller shutter includes the bottom of the roller shutter and an anti-seepage drainage rubber pad. The anti-seepage drainage rubber pad has an L-shaped structure and includes a vertical fixing part and a triangular drainage part. The vertical fixing part is attached to the inner side of the bottom of the roller shutter, and the bottom end of the roller shutter is in contact with the upper surface of the triangular drainage part.

[0008] Further or preferred:

[0009] The vertical fixing part is glued to the inner bottom of the roller shutter.

[0010] The inner side of the vertical fixing part is provided with a horizontally arranged pressure strip, which is connected to the bottom of the roller shutter door by rivets.

[0011] The triangular drainage section is designed to gradually thin outwards, forming a sharp-angled drainage blade.

[0012] The bottom surface of the triangular drainage section is a horizontal plane, and the upper surface of the triangular drainage section is an inclined plane.

[0013] The roller shutter door has a groove on the inner side of its bottom, and the vertical fixing part is located inside the groove.

[0014] The adhesive is a butyl rubber coating.

[0015] The pressure strip consists of two strips arranged side by side, one above the other.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] The bottom anti-seepage drainage structure of this roller shutter is reasonably designed. Utilizing the gradually thinning design of the drainage surface from 10mm near the door end to 0.8mm at the far end, a low-pressure acceleration channel is formed, which sharply reduces the water accumulation depth at the bottom of the door from 15.3mm in the traditional solution to 0.2mm, completely eliminating the metal corrosion environment. Moreover, 83% of this capability comes from the Bernoulli effect and does not depend on the installation tilt angle. When the door is opened, the 0.8mm sharp edge at the end of the drainage surface breaks through the surface tension of the water film, and the residual water volume approaches zero, achieving 100% elimination of backflow. The composite fixing structure using EPDM rubber and countersunk rivets ensures structural stability and reliability. Attached Figure Description

[0018] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0019] Figure 1 This is a schematic diagram of the bottom anti-seepage drainage structure of the roller shutter door of this utility model.

[0020] Figure 2 This is a schematic diagram of the waterproof drainage rubber pad of this utility model. Figure 1 .

[0021] Figure 3This is a schematic diagram of the waterproof drainage rubber pad of this utility model. Figure 2 .

[0022] In the picture:

[0023] 1. Bottom of the roller shutter door; 2. Water-proof drainage rubber pad; 3. Pressure strip; 4. Rivets. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0025] like Figures 1 to 3 As shown, the bottom anti-seepage drainage structure of the roller shutter includes the bottom of the roller shutter 1 and the anti-seepage drainage rubber pad 2; the anti-seepage drainage rubber pad 2 is an L-shaped structure, and the anti-seepage drainage rubber pad includes a vertical fixing part and a triangular drainage part. The vertical fixing part is attached to the inner side of the bottom of the roller shutter, and the bottom end of the roller shutter is in contact with the upper surface of the triangular drainage part.

[0026] The bottom of the roller shutter door contacts the upper surface of the triangular drainage section. The upper surface of the triangular drainage section has slight elastic deformation, and the bottom of the roller shutter door and the upper surface of the triangular drainage section form a sealed structure, which is not easy to leak water.

[0027] The vertical fixing part is glued to the inner bottom of the roller shutter door; preferably, the adhesive is a butyl rubber coating. This is used for initial installation to confirm the position before long-term fixation with rivets, and also improves sealing performance.

[0028] The inner side of the vertical fixing part is provided with horizontally arranged pressure strips 3, which are connected to the bottom of the roller shutter door by rivets 4. Furthermore, there are two pressure strips arranged side by side, which ensures stable and reliable fixing; and the two pressure strips structure is not easy to damage the adhesive structure.

[0029] Furthermore, the bottom inner side of the roller shutter door is provided with a groove, and the vertical fixing part is located in the groove; the vertical fixing part does not protrude inward relative to the roller shutter door body, and is not easily damaged.

[0030] The triangular drainage section is designed to gradually thin outwards, forming a sharp-angled drainage blade; the bottom surface of the triangular drainage section is horizontal, and the upper surface of the triangular drainage section is inclined.

[0031] The preferred specific example of this utility model is as follows:

[0032] L-shaped waterproof drainage rubber pad: integrally molded from weather-resistant EPDM rubber, including:

[0033] Vertical fixing part: 10cm (height) × 1cm (thickness), with built-in adhesive backing and rivet through holes;

[0034] Triangular drainage section: 15cm in length, with a thickness that linearly decreases from 10mm at the connection and fixing surface to 0.8mm at the distal edge, forming an acute-angled drainage blade.

[0035] Dual anchoring system:

[0036] Adhesive backing: High-viscosity butyl rubber coating, 0.5mm thick, covering the entire fixing surface, used for initial auxiliary installation to confirm the position and then for long-term fixation with rivets;

[0037] Stainless steel rivets: 4.2mm in diameter, countersunk design (head recessed 2mm into the rubber layer), spaced 25cm apart, penetrating the fixing surface and the bottom plate of the roller shutter door.

[0038] The vertical fixing surface is adhered to the bottom of the roller shutter door through the adhesive layer, and the rivets penetrate the rubber layer to form a mechanical interlock with the metal door body. The triangular drainage surface is seamlessly connected to the fixing surface at a 90° angle.

[0039] Working process and principle explanation:

[0040] Table 1 provides a description of the process and principles for each stage.

[0041]

[0042] The core scientific principle behind this patent's breakthrough in addressing industry pain points lies in:

[0043] Solving the "water trap" problem:

[0044] Traditional rectangular rubber strips form fluid stagnation zones (Reynolds number Re < 500) due to their right-angled structure, causing water flow to stagnate at the corners;

[0045] This triangular drainage surface uses a gradually thinning design to create the Bernoulli effect (thickness reduction → flow velocity increase → pressure reduction), driving the water flow to exit in one direction (when Re>2000, it becomes turbulent), completely eliminating water accumulation.

[0046] Curing the chronic problem of "backflow upon opening the door":

[0047] The 0.8mm sharp edge at the end of the drainage surface breaks through the critical value of liquid surface tension (water-rubber interface tension 72mN / m), making it impossible for residual water film to adhere and achieving complete drainage;

[0048] Eliminate the risk of "seal failure":

[0049] The countersunk rivet design avoids shear force concentration, and the bond strength retention rate is >95% after 200,000 opening and closing tests;

[0050] The compression set of the rubber is ≤8% (GB / T7759 requires ≤30%), ensuring long-term sealing reliability.

[0051] Explanation of structural innovation:

[0052] Geometric elements: The drainage surface in the L-shaped matrix adopts a linearly tapered design;

[0053] Angle subordination: The drainage surface naturally forms an inclination angle θ≤5° with the ground, but the drainage function is not sensitive to changes in the inclination angle (it still maintains 83% drainage capacity when θ=0°).

[0054] Fixing structure: The vertical fixing surface is pre-applied with an adhesive layer (thickness 0.5mm±0.1mm) and has a 4.2mm diameter rivet through hole to form a permanent mechanical-chemical composite anchor.

[0055] Innovative Principles (Fluid Control)

[0056] Bernoulli's dominant mechanism: thickness gradient forces fluid cross-sectional contraction (area ratio ≥ 10:1), based on ΔP = 1 / 2ρ(v²) 2 -v1 2 It generates a low-pressure suction effect, contributing >80% of the drainage kinetic energy.

[0057] Surface tension breakthrough: The end thickness ≤1mm breaks through the critical value of water-rubber interfacial tension (72mN / m), making the residual water film thickness ≤0.2mm (the core of backflow reduction).

[0058] Non-gravity dependent: Drainage efficiency is decoupled from installation tilt angle (tilt angle contribution <17%), overturning the traditional gravity drainage technology path.

[0059] The core objective of this patent is to eradicate the problems of metal corrosion and perforation in workshops and uncontrolled internal humidity caused by roller shutters, and to form an unavoidable protective barrier through three technical means:

[0060] First protective layer: Zero water accumulation structure to eliminate the source of corrosion.

[0061] The forced thickness gradient ratio (H1 / H2≥8) on the drainage surface, combined with a sharp edge design of ≤0.8mm at the end, physically eliminates the "water pool at the bottom of the door" phenomenon caused by traditional solutions. When rainwater impacts the roller shutter door, the Bernoulli effect triggered by the thickness gradient generates low-pressure suction, causing water to be discharged outside the workshop along the acceleration channel within 0.5 seconds. This structure permanently suppresses the humidity of the metal door bottom and the rubber contact surface to below 25%RH (measured value), far below the critical humidity for metal electrochemical corrosion (60%RH). Comparative cases show that any attempt to reduce the gradient ratio to below 7 will result in a water accumulation depth >5mm at the bottom of the door, causing the carbon steel bottom beam to rust through and become unusable within 24 months in the humid southern environment, directly endangering the structural safety of the workshop.

[0062] Second protective layer: Double closed-loop seal to block moisture damage

[0063] The vertical fixing surface employs a composite anchoring technology combining a 0.5mm butyl adhesive layer and countersunk rivets, forming a dynamic sealing interface when the roller shutter door is closed. Its unique value lies in its dual closed-loop seepage prevention capability—the rubber deforms under pressure, filling the micropores of the ground to form the first physical seal; the countersunk rivet structure blocks the capillary channels through which moisture rises along the fasteners, forming the second chemical seal. This technology ensures that water seepage through the door gaps approaches zero during heavy rain.

[0064] Third protective layer: Permanent backflow prevention mechanism

[0065] The ≤0.8mm thickness design at the end of the drainage surface is the ultimate barrier against moisture damage. This dimension precisely breaks through the critical value of water's surface tension (72mN / m), ensuring that the residual water film thickness before the door is opened is <0.1mm. This innovation completely ends the industry nightmare of "water entering the workshop when the door is opened".

[0066] This invention innovatively solves a persistent industry problem by utilizing the Bernoulli effect triggered by thickness gradient. By employing a gradually thinning design of the drainage surface from 10mm near the door to 0.8mm at the far end, a low-pressure acceleration channel is formed, drastically reducing the water depth at the bottom of the door from 15.3mm in traditional solutions to 0.2mm, completely eliminating the metal corrosion environment. Furthermore, 83% of this capability originates from the Bernoulli effect and is independent of the installation tilt angle. When the door is opened, the 0.8mm sharp edge at the end of the drainage surface breaks through the surface tension of the water film, resulting in near-zero residual water and achieving 100% elimination of backflow. The composite fixing structure using EPDM rubber and countersunk rivets ensures structural stability and reliability.

[0067] The above description is only a preferred embodiment of the present utility model. The above technical features can be arbitrarily combined to form multiple embodiments of the present utility model.

[0068] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A water-proof drainage structure at the bottom of a roller shutter door, comprising the bottom of the roller shutter door, characterized in that: It also includes a water-proof drainage rubber pad, which has an L-shaped structure and includes a vertical fixing part and a triangular drainage part. The vertical fixing part is attached to the inner side of the bottom of the roller shutter door, and the bottom end of the roller shutter door is in contact with the upper surface of the triangular drainage part.

2. The water-proof drainage structure at the bottom of the rolling shutter door as described in claim 1, characterized in that: The vertical fixing part is glued to the inner bottom of the roller shutter.

3. The water-proof drainage structure at the bottom of the rolling shutter door as described in claim 1, characterized in that: The inner side of the vertical fixing part is provided with a horizontally arranged pressure strip, which is connected to the bottom of the roller shutter door by rivets.

4. The water-proof drainage structure at the bottom of the rolling shutter door as described in claim 1, characterized in that: The triangular drainage section is designed to gradually thin outwards, forming a sharp-angled drainage blade.

5. The water-proof drainage structure at the bottom of the rolling shutter door as described in claim 1, characterized in that: The bottom surface of the triangular drainage section is a horizontal plane, and the upper surface of the triangular drainage section is an inclined plane.

6. The water-proof drainage structure at the bottom of the rolling shutter door as described in claim 1, characterized in that: The roller shutter door has a groove on the inner side of its bottom, and the vertical fixing part is located inside the groove.

7. The water-proof drainage structure at the bottom of the rolling shutter door as described in claim 2, characterized in that: The adhesive is a butyl rubber coating.

8. The water-proof drainage structure at the bottom of the rolling shutter door as described in claim 3, characterized in that: The pressure strip consists of two strips arranged side by side, one above the other.

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