Impact-resistant protective shielding case structure

Abstract

The utility model belongs to the technical field of electromagnetic shielding, and particularly relates to an anti-impact protective shielding case structure, which comprises a shielding case body and further comprises warp-wise reinforcing ribs integrally formed on the outer wall of the shielding case body. The latitudinal reinforcing ribs are integrally formed on the outer wall of the shielding case body, the latitudinal reinforcing ribs and the latitudinal reinforcing ribs are distributed in a staggered manner, and the latitudinal reinforcing ribs and the latitudinal reinforcing ribs form a net structure; according to the utility model, the longitudinal reinforcing ribs and the latitudinal reinforcing ribs are processed on the shielding case body, so that the shock resistance of the shielding case body is greatly improved, the shielding case body is not easy to deform when being impacted by external force, and the electromagnetic shielding effect and the safety of the electronic equipment are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic shielding technology, specifically relating to an impact-resistant protective shielding cover structure. Background Technology

[0002] The shielding cover can block external electromagnetic radiation (such as radio waves, static electricity, etc.) from entering the equipment, protect sensitive components (such as chips and sensors) from interference, and ensure stable operation of the equipment.

[0003] Shielding covers are typically made of highly conductive metals (such as copper, aluminum, or iron alloys). They form a Faraday cage effect through grounding, which reflects or absorbs electromagnetic waves. The design must be based on the equipment requirements to select either a fully enclosed or partially covered form.

[0004] For example, in the prior art, Chinese utility model patent with authorization announcement number CN222442137U discloses "a shielding cover", which includes a frame body, through holes, an insulating groove, insulating paint, lugs, an elliptical groove and a convex cover. Two through holes are provided on the right side of the frame body near the elliptical groove. An elliptical groove is provided at the bottom right side of the frame body. A convex cover is provided on the outer wall of the frame body near the left side. An insulating groove is provided in the middle of the frame body. A lug is provided on the left side of the bottom inside the insulating groove.

[0005] While existing shielding covers, including those mentioned above, can meet general usage requirements, they have poor impact resistance. These covers are easily deformed by external forces, affecting the shielding effect and the safety of electronic equipment.

[0006] To address the aforementioned problems, this utility model proposes an impact-resistant protective shield structure. Utility Model Content

[0007] To address the aforementioned problems in the existing technology, this utility model provides an impact-resistant protective shield structure, which is convenient to use and has high impact resistance.

[0008] To achieve the above objectives, this utility model provides the following technical solution: an impact-resistant protective shield structure, comprising a shield body, and further comprising:

[0009] Meridional reinforcing ribs are integrally formed on the outer wall of the shield body;

[0010] The latitudinal reinforcing ribs are integrally formed on the outer wall of the shield body and are distributed alternately with the longitudinal reinforcing ribs, and the latitudinal reinforcing ribs and the longitudinal reinforcing ribs form a mesh structure.

[0011] As a preferred embodiment of this utility model, the shielding cover body is a copper or aluminum component.

[0012] As a preferred embodiment of the present invention, the shielding cover body includes an outer shielding layer, an inner shielding layer, and a mesh interlayer fixed between the outer shielding layer and the inner shielding layer.

[0013] In a preferred embodiment of this utility model, the outer shielding layer and the inner shielding layer have the same thickness, both being 0.07 mm, the mesh interlayer has a thickness of 0.06 mm, and the mesh interlayer has a pore size of 50 μm.

[0014] As a preferred embodiment of this utility model, the cross-sections of both the warp reinforcing rib and the weft reinforcing rib are semi-circular.

[0015] As a preferred technical solution of this utility model, it also includes:

[0016] A fixed protruding edge is integrally formed at the bottom end of the shielding cover body, and a fixing hole is machined on the fixed protruding edge.

[0017] As a preferred technical solution of this utility model, it also includes:

[0018] A conductive rubber ring is bonded and fixed to the bottom surface of the fixed convex edge.

[0019] As a preferred technical solution of this utility model, breathable micropores are processed on the shielding cover body.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] In this invention, by processing warp and weft reinforcing ribs on the shielding cover body, the impact resistance of the shielding cover body is greatly improved, making the shielding cover body less prone to deformation when subjected to external impact, thus ensuring the electromagnetic shielding effect and the safety of electronic equipment.

[0022] Other additional advantages and beneficial effects of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this invention. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the diagram;

[0026] Figure 3 This is a partially enlarged structural diagram of the shielding cover body in this utility model;

[0027] Figure 4 This utility model Figure 3 A magnified structural diagram at point B in the diagram.

[0028] In the figure: 1. Shielding cover body; 101. Breathable micropores; 11. Outer shielding layer; 12. Inner shielding layer; 13. Mesh interlayer; 2. Fixing protrusion; 21. Fixing hole; 3. Warp reinforcing rib; 4. Weft reinforcing rib; 5. Conductive rubber ring. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-4 The present invention provides the following technical solution: an impact-resistant protective shield structure, including a shield body 1, and further including: a warp reinforcing rib 3 and a weft reinforcing rib 4.

[0031] Furthermore, by Figure 1 and Figure 2 As shown in this embodiment, the warp reinforcing rib 3 is integrally formed on the outer wall of the shield body 1, and the weft reinforcing rib 4 is integrally formed on the outer wall of the shield body 1 and is distributed interlaced with the warp reinforcing rib 3. The weft reinforcing rib 4 and the warp reinforcing rib 3 form a mesh structure. After adopting the above scheme, when in use, the warp reinforcing rib 3 and the weft reinforcing rib 4 form an orthogonal mesh, which can evenly distribute the external pressure or impact force to the entire surface of the shield body 1, avoiding the stress concentration problem of traditional unidirectional ribs (such as local depressions or cracks).

[0032] When the shield body 1 is subjected to radial compression, the latitudinal reinforcing rib 4 bears circumferential stress, and the longitudinal reinforcing rib 3 constrains axial deformation. The Poisson's ratio effect of the mesh structure significantly enhances the overall stiffness.

[0033] The moment of inertia (cross-sectional geometric properties) of a mesh structure is about 30%-50% higher than that of a single-rib structure. Especially in thin-walled shields (such as those with a thickness of ≤1mm), the critical instability load can be increased by more than 2 times.

[0034] Data shows that after a certain model of aluminum alloy shielding cover adopted mesh ribs, its compressive strength increased from 80MPa to 130MPa.

[0035] In addition, the one-piece molding avoids the leakage problem of gaps in traditional splicing ribs. The mesh structure and the shield body 1 form a continuous conductive path to ensure electromagnetic wave reflection / absorption efficiency (such as shielding effectiveness SE≥60dB at 1GHz frequency).

[0036] In this invention, the height of the longitudinal reinforcing rib 3 and the latitudinal reinforcing rib 4 is ≤1 / 10 of the wavelength (e.g., ≤30mm at 1GHz) to avoid the formation of a resonant cavity that would cause shielding failure.

[0037] As a further improvement of this utility model, the warp reinforcing rib 3 and the weft reinforcing rib 4 are formed by stamping, forming a protruding structure on the outer wall of the shield body 1, while forming a recessed structure on the inner wall of the shield body 1.

[0038] Optionally, by Figure 1 and Figure 2 As shown, in this embodiment, the shield body 1 is a copper or aluminum component. After adopting the above solution, the material of the shield body 1 needs to be determined according to the actual application scenario when using it.

[0039] Taking the copper shield body 1 as an example, the conductivity of copper is (5.96×10⁻⁶). 7 S / m is higher than that of aluminum (3.72×10). 7 The copper shielding cover (S / m) and the mesh reinforcing rib structure together form a low impedance conductive network with the shielding cover body 1. The shielding effectiveness in the high frequency band (>10GHz) is 5-10dB higher than that of aluminum parts. For example, in the 5G millimeter wave (28GHz) scenario, the SE of the copper shielding cover can reach 85dB, while that of the aluminum shielding cover is 75dB.

[0040] Copper has a shallower skin depth (approximately 1.6 μm at 28 GHz, compared to 2.1 μm for aluminum), allowing for efficient shielding with thin ribs (such as 0.5 mm thick), making it suitable for ultra-thin electronic devices.

[0041] The yield strength of pure copper is about 70 MPa, which can be increased to 200 MPa through cold working (such as stamping). The mesh-like reinforcing rib structure makes its specific strength (strength / density) close to that of aluminum alloy (copper density 8.9 g / cm³, aluminum 2.7 g / cm³).

[0042] Copper has a thermal conductivity (401 W / (m·K)) that is 69% higher than that of aluminum (237 W / (m·K)), and is used for shielding high-power chips (such as server CPU shields) to help dissipate heat.

[0043] Optionally, by Figures 1-4As shown in this embodiment, the shielding cover body 1 includes an outer shielding layer 11, an inner shielding layer 12, and a mesh interlayer 13 fixed between the outer shielding layer 11 and the inner shielding layer 12. With the above scheme, when in use, the outer shielding layer 11 (copper / aluminum) reflects high-frequency electromagnetic waves, and its thickness needs to be ≥ the skin depth (e.g., copper ≥ 8.5μm, aluminum ≥ 11μm at 1GHz); the mesh interlayer 13 is made of copper / aluminum plate by etching (or can be woven from copper / aluminum alloy wire), forming secondary reflection, and absorbing part of the energy through grid resistance loss; the inner shielding layer 12 isolates internal interference sources and forms a Faraday cage double shielding layer with the outer shielding layer 11. The overall shielding effectiveness (SE) is: SE total = SE outer + SE inner + coupling loss, which can achieve SE ≥ 100dB in the 1-10GHz frequency band (single-layer shielding is usually ≤ 80dB).

[0044] The mesh interlayer 13, together with the outer shielding layer 11 and the inner shielding layer 12, reduces the overall weight by 40%-60% compared to the solid shielding cover, while increasing the bending stiffness by more than 2 times (due to the I-beam effect of the interlayer).

[0045] Optionally, by Figures 1-4 As shown, in this embodiment, the outer shielding layer 11 and the inner shielding layer 12 have the same thickness, both 0.07 mm, the mesh interlayer 13 has a thickness of 0.06 mm, and the pore size of the mesh interlayer 13 is 50 μm. After adopting the above scheme, when in use, the total thickness of the shielding cover body 1 = the thickness of the outer shielding layer 11 + the thickness of the inner shielding layer 12 + the thickness of the mesh interlayer 13 = 2 mm, which is suitable for flexible electronics or micro-devices (such as chip-level shielding).

[0046] Optionally, by Figure 1 and Figure 2 As shown, in this embodiment, the cross-sections of both the warp reinforcing rib 3 and the weft reinforcing rib 4 are semi-circular. Using the above scheme, assuming the height h of the warp reinforcing rib 3 and the weft reinforcing rib 4 is 0.1 mm and the radius of the semicircle r is h / 2 = 0.05 mm, then the moment of inertia of the cross-section I = (πr) / 2 = 0.05 mm. 4 ) / 8≈2.45×10⁻¹³mm 4 Compared to a rectangular rib of the same height (0.05mm wide), I = bh³ / 12 = 2.08 × 10⁻¹³ mm 4 18% higher.

[0047] For a reinforcing rib with a length of 1 mm, the maximum deflection of a semi-circular rib, δ=FL³ / (3EI), is reduced by 15% compared to that of a rectangular rib, making it more suitable for supporting ultra-thin structures.

[0048] In addition, the semi-circular cross section eliminates right-angle stress concentration, and the maximum equivalent stress at the rib root σ_max=My / I is reduced by 30% compared to that of the rectangular rib (M=bending moment, y=distance from the farthest point of the neutral axis). It has been verified that under a load of 1N, the σ_max at the root of the semi-circular rib is 120MPa, while that of the rectangular rib is 170MPa (yield strength of aluminum material is 270MPa).

[0049] In terms of electromagnetic shielding, it has been verified that at 10GHz, the skin depth of copper is δ=0.85μm and the surface curvature radius of the semi-circular rib is >10δ, which avoids the diffraction loss of electromagnetic waves at the corners and improves the shielding effectiveness SE by 5dB.

[0050] Optionally, by Figure 1 and Figure 2 As shown, this embodiment also includes: a fixed protrusion 2, which is integrally formed on the bottom end of the shielding cover body 1, and a fixing hole 21 is machined on the fixed protrusion 2. After adopting the above solution, when in use, the fixed protrusion 2 is formed synchronously with the shielding cover body 1, and the thickness is the same as that of the shielding cover body 1 (0.07mm). It is connected by a rounded corner transition (R=0.2mm), which reduces stress concentration by 40% and improves fatigue life by 3 times compared with the welded protrusion.

[0051] In use, the shield body 1 is installed and fixed by screws through the fixed protruding edge 2 (adhesive bonding can also be used for fixing if necessary).

[0052] Preferably, by Figure 1 and Figure 2 As shown, this embodiment also includes a conductive rubber ring 5, which is bonded and fixed to the bottom surface of the fixed protrusion 2. After adopting the above solution, in use, the conductive rubber ring 5 (such as silver-coated copper powder filled silicone rubber with a volume resistivity ≤10mΩ・cm) forms a triple conductive contact with the fixed protrusion 2 and the mounting surface (such as the metal layer of the PCB board), and the gap leakage is reduced from -90dBμV / m (without rubber ring) to -120dBμV / m (1GHz).

[0053] Preferably, by Figure 1 and Figure 2 As shown, in this embodiment, a breathable micropore 101 is processed on the shield body 1. After adopting the above solution, when in use, the diameter of the breathable micropore 101 is d=0.1mm, and its rectangular hole cutoff frequency f_c=1.84c / (πd)≈1.84×3×10 8 / (π×0.1×10⁻³)≈1.76THz, meaning that electromagnetic waves with frequencies below 1.76THz will be shielded, meeting the requirements of 5G (<100GHz) and below frequency bands.

[0054] It should also be noted that the breathable micropores 101 are set between the ribs of the mesh interlayer 13. By utilizing the electromagnetic shielding effect of the metal ribs, the leakage is reduced by 20dB. This not only does not affect the electromagnetic shielding effect, but also helps the electronic equipment to dissipate heat.

[0055] Components not described in detail in this article are existing technologies.

[0056] The working principle and usage process of this utility model: When the impact-resistant protective shield structure of this utility model is in use, the longitudinal reinforcing ribs 3 and the latitudinal reinforcing ribs 4 form an orthogonal grid, which can evenly distribute the external pressure or impact force to the entire surface of the shield body 1, avoiding the stress concentration problem of traditional unidirectional ribs (such as local depressions or cracks), and greatly improving the structural strength of the shield body 1.

[0057] The shielding cover body 1 includes an outer shielding layer 11, an inner shielding layer 12, and a mesh interlayer 13 fixed between the outer shielding layer 11 and the inner shielding layer 12. The overall weight is reduced by 40%-60% compared to a solid shielding cover, while the bending stiffness is increased by more than 2 times.

[0058] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An impact-resistant protective shield structure, comprising a shield body (1), characterized in that, Also includes: Meridional reinforcing rib (3), the meridional reinforcing rib (3) is integrally formed on the outer wall of the shield body (1); The latitudinal reinforcing rib (4) is integrally formed on the outer wall of the shield body (1) and is distributed interlaced with the longitudinal reinforcing rib (3), and the latitudinal reinforcing rib (4) and the longitudinal reinforcing rib (3) form a mesh structure.

2. The impact-resistant protective shield structure according to claim 1, characterized in that: The shield body (1) is a copper or aluminum component.

3. The impact-resistant protective shield structure according to claim 1, characterized in that: The shield body (1) includes an outer shielding layer (11), an inner shielding layer (12), and a mesh interlayer (13) fixed between the outer shielding layer (11) and the inner shielding layer (12).

4. The impact-resistant protective shield structure according to claim 3, characterized in that: The outer shielding layer (11) and the inner shielding layer (12) have the same thickness, both being 0.07 mm. The mesh interlayer (13) has a thickness of 0.06 mm and a pore size of 50 μm.

5. The impact-resistant protective shield structure according to claim 1, characterized in that: The cross-sections of the meridional reinforcing rib (3) and the latitudinal reinforcing rib (4) are both semi-circular.

6. The impact-resistant protective shield structure according to claim 1, characterized in that: Also includes: The fixed protrusion (2) is integrally formed on the bottom end of the shield body (1), and a fixing hole (21) is machined on the fixed protrusion (2).

7. The impact-resistant protective shield structure according to claim 6, characterized in that: Also includes: A conductive rubber ring (5) is bonded and fixed to the bottom surface of the fixed protrusion (2).

8. The impact-resistant protective shield structure according to claim 1, characterized in that: The shield body (1) is provided with breathable micropores (101).

Images