Metallic enclosure for electromagnetic shielding

Abstract

This utility model discloses a metal casing for electromagnetic shielding, including an upper casing, a lower casing, and a grounding wire. The upper and lower casings have spaces for placing electronic products. The lower casing is connected to the grounding wire, which is used to connect to a grounding system. The upper and lower casings are detachably connected. A plug-in ring is provided at one end of the upper casing facing the lower casing, and the lower casing has a wall groove adapted to the plug-in ring. Conductive rubber is provided between the upper and lower casings. By providing conductive rubber at the joints of the metal casing, the impedance of the electrostatic discharge path is significantly reduced, effectively solving the high impedance problem caused by holes and gaps in traditional casings, preventing the enhancement of the electric field caused by charge accumulation. The conductive rubber not only provides excellent conductivity but also enhances the sealing of the casing, preventing moisture and dust intrusion.

Description

Technical Field

[0001] This utility model belongs to the technical field of electromagnetic shielding shells, specifically a metal shell used for electromagnetic shielding. Background Technology

[0002] Static electricity is ubiquitous in our lives. Friction, induction, and environmental factors can all generate static electricity carrying positive or negative charges. When these charges accumulate to a certain amount, they transfer through a discharge path, eventually resulting in electrostatic discharge, a phenomenon known as electrostatic release. Electrostatic release is typically characterized by high potential, strong electric field, and large instantaneous current, potentially generating strong electromagnetic radiation and electromagnetic pulses. During the manufacturing, transportation, or use of electronic products, electrostatic release poses significant risks to product quality, ranging from performance degradation to equipment malfunctions and even safety accidents. Therefore, electrostatic protection measures such as static dissipation, neutralization, and grounding are widely used, with grounding being particularly prevalent in products with metal casings.

[0003] Existing metal casings are typically divided into an upper casing and a lower casing. Ideally, static electricity would be discharged directly from the discharge point to the grounding point. However, in reality, metal casings inevitably have various holes and gaps, resulting in high impedance of the static discharge path. It is difficult to discharge static electricity in a short time. If the static electricity is not discharged in time, the static charge will slowly accumulate on the casing. When the charge reaches a certain amount, an electric field will be established between the casing and the internal circuitry. As the electric field strengthens, the static electricity will interfere with the internal electronics and circuitry, posing a risk of electrostatic breakdown. This poses a danger to products located inside the metal casing and reduces product quality. Utility Model Content

[0004] The purpose of this invention is to provide a metal casing for electromagnetic shielding to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A metal casing for electromagnetic shielding includes an upper shell, a lower shell, and a grounding wire. The upper shell and the lower shell have spaces for placing electronic products. The lower shell is connected to the grounding wire, which is used to connect to a grounding system. The upper shell and the lower shell are detachably connected. The upper shell has a plug-in ring at one end facing the lower shell, and the lower shell has a wall groove adapted to the plug-in ring. Conductive rubber is disposed between the upper shell and the lower shell.

[0007] In a further technical solution, the bottom end of the insertion ring is provided with a plurality of contact blocks, and the bottom of the wall groove is provided with a plurality of contact grooves, wherein the contact blocks are inserted into the contact grooves.

[0008] In a further technical solution, the upper shell is provided with test lines and test slots, the test lines are located inside the test slots, and a switch plate is provided on the wall of the test slots, the switch plate being used to open or close the test slots.

[0009] In a further technical solution, the conductive rubber is made of aluminum-plated silver conductive filler, and the density of the conductive rubber is 3.4±0.25g / cm³.

[0010] In a further technical solution, the wall of the groove is provided with a threaded hole one, the insertion ring is provided with a threaded hole two, and the groove and the insertion ring are detachably connected by screws.

[0011] The beneficial effects of this utility model are:

[0012] When static charge is generated on the surface of the upper shell, the charge is first transferred through the plug ring at the end of the upper shell facing the lower shell to the conductive rubber in contact with the groove in the lower shell wall. The conductive rubber fills the seam between the upper and lower shells, forming a low-impedance conductive path. The charge is quickly conducted to the lower shell through the conductive rubber, and further transferred to the grounding system through the connection between the lower shell and the grounding wire, achieving rapid discharge and preventing charge accumulation on the shell surface. By setting conductive rubber at the seam of the metal shell, the impedance of the static discharge path is significantly reduced, effectively solving the high impedance problem caused by holes and gaps in traditional shells, preventing the enhancement of the electric field caused by charge accumulation. The conductive rubber not only provides excellent conductivity, but also enhances the sealing of the shell, preventing moisture and dust from entering.

[0013] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0014] Figure 1 : A schematic diagram of the background technology of this utility model.

[0015] Figure 2 : A cross-sectional view of the overall structure of this utility model.

[0016] Figure 3 : A schematic diagram of the assembly process of this utility model.

[0017] Figure 4 The overall structure of this utility model Figure 1 .

[0018] Figure 5 The overall structure of this utility model Figure 2 .

[0019] Figure 6 : Structural diagram of the lower shell of this utility model.

[0020] Reference numerals: 1. Upper shell; 11. Connecting ring; 12. Contact block; 2. Lower shell; 21. Wall groove; 22. Contact groove; 3. Grounding wire; 4. Conductive rubber; 5. Test groove; 6. Switch board; 7. Threaded hole one; 8. Threaded hole two Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] Please refer to Figure 1-6 ;

[0023] Existing metal casings typically consist of an upper casing (1) and a lower casing (2). Ideally, static electricity should be rapidly discharged by conducting directly from the discharge point to the grounding point. However, in practical applications, casings often have structural defects such as holes and gaps, resulting in high impedance of the static discharge path and making it difficult to effectively release static electricity in a short time. If static electricity is not discharged in time, the charge will gradually accumulate on the casing surface. When the charge accumulates to a certain level, a strong electric field will be formed between the casing and the internal circuitry. As the electric field strength increases, static electricity may be released, interfering with internal electronic components or circuits, and even posing a risk of electrostatic breakdown. This will pose a potential threat to the products inside the metal casing and reduce product quality.

[0024] This utility model discloses a metal casing for electromagnetic shielding, including an upper shell 1, a lower shell 2, and a grounding wire 3. The upper shell 1 and lower shell 2 have spaces for placing electronic products. Several vertical metal plates are arranged at the bottom of the lower shell 2 to allow for the placement of electronic products in designated areas, preventing electromagnetic crosstalk between different electronic modules within the products. The lower shell 2 is connected to the grounding wire 3, which is used to connect to a grounding system. The upper shell 1 and lower shell 2 are detachably connected. A plug-in ring 11 is provided at the end of the upper shell 1 facing the lower shell 2, and the lower shell 2 has a wall groove 21 adapted to the plug-in ring 11. Conductive rubber 4 is provided between the upper shell 1 and lower shell 2. Compared to traditional designs where there is a gap between the upper shell 1 and lower shell 2, resulting in higher impedance and a dangerous electric field between the upper shell 1 and the internal circuitry, in this embodiment, the conductive rubber 4 fills the gap, reducing impedance.

[0025] Specifically, in the electromagnetic shielding metal shell of this invention, when static charge is generated on the surface of the upper shell 1, the charge is first transferred through the insertion ring 11 at the end of the upper shell 1 facing the lower shell 2 to the conductive rubber 4 that contacts the groove 21 of the lower shell 2. The conductive rubber 4 fills the seam between the upper shell 1 and the lower shell 2, forming a low-impedance conductive path. The charge is quickly conducted to the lower shell 2 through the conductive rubber 4, and further transferred to the grounding system through the connection between the lower shell 2 and the grounding wire 3, achieving rapid discharge and preventing charge accumulation on the shell surface. By setting conductive rubber 4 at the seam of the metal shell, the impedance of the static discharge path is significantly reduced, effectively solving the high impedance problem caused by holes and gaps in traditional shells, preventing the enhancement of the electric field caused by charge accumulation. The conductive rubber 4 not only provides excellent conductivity, but also enhances the sealing of the shell, preventing moisture and dust from entering.

[0026] Furthermore, the bottom end of the plug-in ring 11 is provided with several contact blocks 12, and the bottom of the wall groove 21 is provided with several contact grooves 22. The contact blocks 12 are plugged into the contact grooves 22. By providing several contact blocks 12 at the bottom end of the plug-in ring 11 and precisely plugging them into the contact grooves 22 at the bottom of the wall groove 21, the contact area between the upper shell 1 and the lower shell 2 is significantly enhanced. Compared with the traditional shell relying solely on the simple contact between the plug-in ring 11 and the wall groove 21, the effective area of ​​the conductive interface is increased through the interlocking structure of the multi-point contact blocks 12 and the contact grooves 22, thereby significantly reducing the contact resistance. Combined with the low impedance characteristics of the conductive rubber 4, the overall impedance of the electrostatic discharge path is further reduced, effectively preventing charge accumulation and electric field enhancement. At the same time, the plugging design of the contact blocks 12 and the contact grooves 22 enhances the mechanical stability of the upper shell 1 and the lower shell 2, ensuring the reliability of the conductivity in long-term use.

[0027] For electronic products or circuits with high electromagnetic shielding requirements, determining the electromagnetic shielding effect of the metal casing is crucial when selecting one. However, quantifying this effect is often inconvenient. In this embodiment, the upper casing 1 is equipped with test leads and a test slot 5. The test leads are located within the test slot 5, with one end fixedly connected to the upper casing 1 and the other end connected to an external current testing device. A switch plate 6 is mounted on the wall of the test slot 5 to open or close it. When testing the electromagnetic shielding effect of the metal casing using the test leads, the switch plate 6 is moved to open the test slot 5, allowing the operator to remove the test leads and connect them to the external current testing device. This significantly improves the convenience of testing the electromagnetic shielding effect.

[0028] The conductive rubber 4 is made of aluminum-plated silver conductive filler. The density of the conductive rubber 4 is 3.4±0.25 g / cm³. The conductive rubber 4 made of aluminum-plated silver conductive filler has a density of 3.4±0.25 g / cm³, which significantly improves the electrostatic discharge and electromagnetic shielding performance of the metal shell. The aluminum-plated silver filler gives the conductive rubber 4 excellent conductivity, ensuring that the contact resistance at the joint between the upper shell 1 and the lower shell 2 is reduced, forming a low-impedance discharge path, and effectively avoiding the enhancement of electric field caused by charge accumulation.

[0029] In this embodiment, the wall of the groove 21 is provided with a threaded hole 7, and the plug ring 11 is provided with a threaded hole 8. The groove 21 and the plug ring 11 are detachably connected by screws.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A metal casing for electromagnetic shielding, characterized in that, The device includes an upper shell (1), a lower shell (2), and a grounding wire (3). The upper shell (1) and the lower shell (2) are provided with spaces for placing electronic products. The lower shell (2) is connected to the grounding wire (3), which is used to connect to the grounding system. The upper shell (1) and the lower shell (2) are detachably connected. The upper shell (1) is provided with a plug ring (11) at one end facing the lower shell (2). The lower shell (2) is provided with a wall groove (21) that matches the plug ring (11). Conductive rubber (4) is provided between the upper shell (1) and the lower shell (2).

2. The metal casing for electromagnetic shielding according to claim 1, characterized in that, The bottom end of the plug ring (11) is provided with a plurality of contact blocks (12), and the bottom of the wall groove (21) is provided with a plurality of contact grooves (22), and the contact blocks (12) are plugged into the contact grooves (22).

3. A metal casing for electromagnetic shielding according to claim 1, characterized in that, The upper shell (1) is provided with test lines and test slots (5). The test lines are located inside the test slots (5). A switch plate (6) is provided on the wall of the test slots (5). The switch plate (6) is used to open or close the test slots (5).

4. A metal casing for electromagnetic shielding according to claim 1, characterized in that, The conductive rubber (4) is made of aluminum-plated silver conductive filler, and the density of the conductive rubber (4) is 3.4±0.25g / cm³.

5. A metal casing for electromagnetic shielding according to claim 1, characterized in that, The wall of the groove (21) has a threaded hole 1 (7) and the plug ring (11) has a threaded hole 2 (8). The wall groove (21) and the plug ring (11) are detachably connected by screws.

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