Safety capacitor against electromagnetic interference

Abstract

The utility model discloses a kind of safety capacitor of anti-electromagnetic interference, including packaging shell, the inside of packaging shell is installed with polar plate and dielectric component in turn, PTC thermistor is connected in series on polar plate, the one end of polar plate is uniformly provided with pin, and one end of packaging shell is fixed with packaging cover plate.The utility model uses, by being equipped with nickel-plated copper foil shielding layer in the inside of packaging shell side wall, and ground cable extending to the outside of device is connected on nickel-plated copper foil shielding layer, to make device can be connected ground by the metal shielding structure of additional installation on packaging shell through ground cable, the interference of internal electric field to external circuit is blocked, and, by setting aluminium hydroxide flame-retardant coating on the inner side of packaging shell, and halogen-free epoxy resin filling layer is filled in the inside of packaging shell, it can ensure that no toxic gas is generated when internal element of device burns, and flame spread is blocked, and safety performance is further optimized.

Description

Technical Field

[0001] This utility model relates to the technical field of safety capacitor structure, specifically to a safety capacitor that resists electromagnetic interference. Background Technology

[0002] Safety capacitors are popular among consumers due to their high safety performance, high voltage resistance, and good stability. They are capacitors that comply with safety standards and play a role in filtering and coupling in circuits. In the event of capacitor failure, they will not cause electric shock to the human body, nor will they cause equipment damage or fires or other safety accidents.

[0003] Current safety capacitors are packaged in a single insulating plastic structure, which has poor electromagnetic interference resistance and cannot block the interference of internal electric fields on external circuits, affecting their practicality. Furthermore, they are prone to overheating and explosion during long-term use, resulting in poor explosion-proof safety. Based on this, we propose a new type of electromagnetic interference-resistant safety capacitor. Utility Model Content

[0004] The purpose of this invention is to provide a safety capacitor that resists electromagnetic interference, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a safety capacitor for electromagnetic interference resistance, comprising a package shell, wherein plates and dielectric components are sequentially installed inside the package shell, a PTC thermistor is connected in series on the plates, pins are evenly arranged at one end of the plates, a package cover is fixed at one end of the package shell, explosion-proof recesses are evenly arranged on the package cover, a cross-shaped groove is provided inside the explosion-proof recesses, first arc-shaped explosion-proof protrusions are evenly arranged on both sides of the package shell, second arc-shaped explosion-proof protrusions are evenly arranged on the top and bottom of the package shell, an aluminum hydroxide flame-retardant coating is provided on the inner sidewall of the package shell, a nickel-plated copper foil shielding layer is installed inside the sidewall of the package shell, a grounding cable connected to the nickel-plated copper foil shielding layer is provided on the package cover, and a halogen-free epoxy resin potting layer is filled inside the package shell.

[0006] Preferably, the encapsulation cover is provided with an injection port that matches the halogen-free epoxy resin potting layer.

[0007] Preferably, the dielectric component is provided with a ceramic dielectric base layer, and the outer wall of the ceramic dielectric base layer is provided with a glass glaze coating.

[0008] Preferably, the outer wall of the glass glaze coating is provided with a silicone coating layer.

[0009] Preferably, the dielectric component is wrapped around the PTC thermistor and the electrode plate.

[0010] Preferably, the outer wall of the electrode plate is provided with a self-healing metallization layer.

[0011] Preferably, the self-healing metallization layer is made of zinc-aluminum alloy.

[0012] Preferably, the first arc-shaped explosion-proof protrusion and the second arc-shaped explosion-proof protrusion are arranged at equal intervals on the encapsulation shell, and the inner sidewalls of the first arc-shaped explosion-proof protrusion and the second arc-shaped explosion-proof protrusion are both provided with a polyurethane foam coating.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) The electromagnetic interference-resistant safety capacitor optimizes the structure of the device by setting a halogen-free epoxy resin potting layer, etc. On the one hand, by setting a nickel-plated copper foil shielding layer inside the side wall of the package shell, and connecting a grounding cable extending to the outside of the device on the nickel-plated copper foil shielding layer, the device can use the metal shielding structure added on the package shell to connect to the ground through the grounding cable, thus blocking the interference of the internal electric field to the external circuit. On the other hand, by setting an aluminum hydroxide flame-retardant coating on the inner side of the package shell and filling the inside of the package shell with a halogen-free epoxy resin potting layer, it can ensure that no toxic gas is produced when the internal components of the device burn, and block the spread of flame.

[0015] (2) The electromagnetic interference-resistant safety capacitor optimizes the device's performance by setting a first arc-shaped explosion-proof protrusion, etc. On the one hand, by uniformly setting a first arc-shaped explosion-proof protrusion and a second arc-shaped explosion-proof protrusion on the outer periphery of the encapsulation shell, the stress is evenly distributed along the curved surface when the arc structure is subjected to internal pressure, with no obvious stress concentration points, which improves the explosion-proof effect of the side wall of the encapsulation shell. Furthermore, by setting a polyurethane foam coating on the inner side wall of both the first arc-shaped explosion-proof protrusion and the second arc-shaped explosion-proof protrusion, it can consume energy through the compression deformation of the foam pores, reduce the peak pressure of the inner wall, and further improve the convenience performance, thereby enabling the device shell structure to achieve a better explosion-proof protection effect. On the other hand, by uniformly setting explosion-proof notches with cross-shaped grooves on the encapsulation cover plate, when the internal pressure is too high, the explosion-proof notches and cross-shaped grooves will break and release gas first, avoiding the encapsulation shell from bursting, which is conducive to limiting the explosion energy and also facilitates the subsequent recycling and maintenance of the encapsulation shell.

[0016] (3) The electromagnetic interference-resistant safety capacitor is equipped with a PTC thermistor, which enables the device to be used in practice. On the one hand, the PTC thermistor, which is matched with the plate in series inside the device, will increase its resistance when the voltage exceeds 1.5 times the rated value. This can limit the fault current and prevent thermal runaway explosion. On the other hand, the dielectric component is set as a composite structure consisting of a ceramic dielectric base layer, a glass glaze coating and a silicone coating layer. Even if one layer breaks down, the other layers can still maintain insulation. Thus, the three-layer insulation structure achieves a good insulation withstand voltage effect. Furthermore, by setting a self-healing metallization layer made of zinc-aluminum alloy on the outer wall of the plate, if a breakdown occurs during the use of the metallization film plate, the metal layer around the breakdown point will evaporate due to the instantaneous high temperature, forming a metal-free insulation area, thus avoiding short circuit. This makes the capacitor product have a self-healing effect and high stability during use. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of the present invention;

[0018] Figure 2 This is a side view of the structure of this utility model;

[0019] Figure 3 This is a partial cross-sectional view of the present invention.

[0020] Figure 4 This is a partial cross-sectional view of the pin structure of this utility model from the front view;

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the side wall of the dielectric component of this utility model.

[0022] In the diagram: 1. Encapsulation cover; 2. Grounding cable; 3. Pin; 4. First arc-shaped explosion-proof protrusion; 5. Encapsulation shell; 6. Cross-shaped groove; 7. Explosion-proof notch; 8. Filling port; 9. Nickel-plated copper foil shielding layer; 10. Aluminum hydroxide flame-retardant coating; 11. Halogen-free epoxy resin potting layer; 12. Second arc-shaped explosion-proof protrusion; 13. PTC thermistor; 14. Electrode plate; 15. Self-healing metallization layer; 16. Dielectric component; 17. Ceramic dielectric base layer; 18. Glass glaze coating; 19. Silicone encapsulation layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figure 1-5 An embodiment of this utility model is provided: a safety capacitor for electromagnetic interference resistance, including a package shell 5, an electrode plate 14 and a dielectric component 16 are sequentially installed inside the package shell 5, a PTC thermistor 13 is connected in series on the electrode plate 14, and pins 3 are evenly arranged at one end of the electrode plate 14.

[0025] A ceramic dielectric substrate 17 is provided on the dielectric assembly 16, and a glass glaze coating 18 is provided on the outer wall of the ceramic dielectric substrate 17.

[0026] A silicone coating layer 19 is provided on the outer wall of the glass glaze coating 18;

[0027] In use, by setting the dielectric component 16 as a composite structure consisting of a ceramic dielectric base layer 17, a glass glaze coating 18, and a silicone coating layer 19, even if one layer breaks down, the remaining layers can still maintain insulation, thus achieving a better insulation withstand voltage effect through the three-layer insulation structure.

[0028] The dielectric component 16 is wrapped around the PTC thermistor 13 and the electrode 14;

[0029] The outer wall of the electrode plate 14 is provided with a self-healing metallization layer 15;

[0030] The self-healing metallization layer 15 is made of zinc-aluminum alloy;

[0031] In use, by connecting a PTC thermistor 13 in series with the electrode 14 inside the device, when the voltage exceeds 1.5 times the rated value, the resistance of the PTC thermistor 13 increases sharply, which can limit the fault current and prevent thermal runaway explosion.

[0032] One end of the encapsulation shell 5 is fixed with an encapsulation cover plate 1. Explosion-proof recesses 7 are evenly arranged on the encapsulation cover plate 1. A cross-shaped groove 6 is arranged inside the explosion-proof recesses 7. First arc-shaped explosion-proof protrusions 4 are evenly arranged on both sides of the encapsulation shell 5. Second arc-shaped explosion-proof protrusions 12 are evenly arranged on the top and bottom of the encapsulation shell 5.

[0033] The first arc-shaped explosion-proof protrusion 4 and the second arc-shaped explosion-proof protrusion 12 are arranged at equal intervals on the encapsulation shell 5, and the inner sidewalls of the first arc-shaped explosion-proof protrusion 4 and the second arc-shaped explosion-proof protrusion 12 are both provided with polyurethane foam coating.

[0034] In use, by uniformly providing a first arc-shaped explosion-proof protrusion 4 and a second arc-shaped explosion-proof protrusion 12 on the outer periphery of the encapsulation shell 5, the stress is evenly distributed along the curved surface when the arc structure is subjected to internal pressure, with no obvious stress concentration points, which improves the explosion-proof effect of the side wall of the encapsulation shell 5. Furthermore, by providing a polyurethane foam coating on the inner side wall of both the first arc-shaped explosion-proof protrusion 4 and the second arc-shaped explosion-proof protrusion 12, it can consume energy through the compression deformation of the foam pores, reduce the peak pressure of the inner wall, further improve the convenience performance, and thus enable the device shell structure to achieve a better explosion-proof protection effect.

[0035] The inner wall of the encapsulation shell 5 is provided with an aluminum hydroxide flame retardant coating 10, and a nickel-plated copper foil shielding layer 9 is installed inside the side wall of the encapsulation shell 5. A grounding cable 2 connected to the nickel-plated copper foil shielding layer 9 is provided on the encapsulation cover plate 1. The interior of the encapsulation shell 5 is filled with a halogen-free epoxy resin potting layer 11.

[0036] The encapsulation cover plate 1 is provided with an injection port 8 that matches the halogen-free epoxy resin potting layer 11;

[0037] In use, on the one hand, by arranging a nickel-plated copper foil shielding layer 9 inside the side wall of the encapsulation shell 5, and connecting a grounding cable 2 extending to the outside of the device to the nickel-plated copper foil shielding layer 9, the device can be connected to the ground through the grounding cable 2 using the metal shielding structure installed on the encapsulation shell 5, thus blocking the interference of the internal electric field to the external circuit. On the other hand, by setting an aluminum hydroxide flame-retardant coating 10 on the inner side of the encapsulation shell 5, and filling the inside of the encapsulation shell 5 with a halogen-free epoxy resin potting layer 11, it can be ensured that no toxic gases are produced when the internal components of the device burn, and the spread of flames can be blocked.

[0038] In this embodiment, the following features are utilized: A PTC thermistor 13, matched to the electrode 14, is connected in series within the device. When the voltage exceeds 1.5 times the rated value, the resistance of the PTC thermistor 13 surges, limiting fault current and preventing thermal runaway explosion. Furthermore, a nickel-plated copper foil shielding layer 9 is arranged inside the sidewall of the enclosure 5, and a grounding cable 2 extending to the outside of the device is connected to the nickel-plated copper foil shielding layer 9. This allows the device to utilize the metal shielding structure on the enclosure 5 to connect to the ground via the grounding cable 2, blocking interference from the internal electric field to the external circuit. Additionally, an aluminum hydroxide flame-retardant coating 10 is applied to the inner surface of the enclosure 5, and a halogen-free epoxy resin potting layer 11 is filled inside the enclosure 5. This ensures that no toxic gases are produced when the internal components burn and prevents flame spread. Moreover, by setting the dielectric component 16 as… The composite structure consisting of ceramic dielectric substrate 17, glass glaze coating 18, and silicone coating layer 19 can maintain insulation even if one layer breaks down, thus achieving good insulation and withstand voltage through the three-layer insulation structure. Furthermore, by providing a self-healing metallization layer 15 made of zinc-aluminum alloy on the outer wall of the electrode plate 14, if a breakdown occurs during use, the metal layer around the breakdown point will evaporate due to instantaneous high temperature, forming a metal-free insulation area, thus avoiding short circuits. This gives the capacitor product a self-healing effect and high stability during use. In addition, by uniformly providing explosion-proof recesses 7 with cross-shaped grooves 6 on the encapsulation cover plate 1, when the internal pressure is too high, the explosion-proof recesses 7 and cross-shaped grooves 6 will rupture first to release gas, preventing the encapsulation shell 5 from bursting. This helps to limit the explosion energy and facilitates the subsequent recycling and maintenance of the encapsulation shell 5.

Claims

1. A safety capacitor for electromagnetic interference suppression, characterized in that, The package includes a housing (5), inside which an electrode plate (14) and a dielectric component (16) are sequentially installed. A PTC thermistor (13) is connected in series on the electrode plate (14). Pins (3) are evenly arranged on one end of the electrode plate (14). A package cover plate (1) is fixed to one end of the package (5). Explosion-proof recesses (7) are evenly arranged on the package cover plate (1). A cross-shaped groove (6) is arranged inside the explosion-proof recesses (7). Both sides of the package (5) are evenly arranged... The first arc-shaped explosion-proof protrusion (4) is uniformly provided, and the top and bottom of the encapsulation shell (5) are uniformly provided with the second arc-shaped explosion-proof protrusion (12). The inner sidewall of the encapsulation shell (5) is provided with an aluminum hydroxide flame-retardant coating (10). The inside of the sidewall of the encapsulation shell (5) is installed with a nickel-plated copper foil shielding layer (9). The encapsulation cover plate (1) is provided with a grounding cable (2) connected to the nickel-plated copper foil shielding layer (9). The inside of the encapsulation shell (5) is filled with a halogen-free epoxy resin potting layer (11).

2. The safety capacitor for electromagnetic interference suppression according to claim 1, characterized in that: The encapsulation cover plate (1) is provided with an injection port (8) that matches the halogen-free epoxy resin potting layer (11).

3. The safety capacitor for electromagnetic interference suppression according to claim 1, characterized in that: The dielectric assembly (16) is provided with a ceramic dielectric substrate (17), and the outer wall of the ceramic dielectric substrate (17) is provided with a glass glaze coating (18).

4. The safety capacitor for electromagnetic interference suppression according to claim 3, characterized in that: The outer wall of the glass glaze coating (18) is provided with a silicone coating layer (19).

5. A safety capacitor for electromagnetic interference suppression according to claim 1, characterized in that: The dielectric component (16) is wrapped around the PTC thermistor (13) and the electrode (14).

6. The safety capacitor for electromagnetic interference suppression according to claim 1, characterized in that: The outer wall of the electrode plate (14) is provided with a self-healing metallization layer (15).

7. A safety capacitor for electromagnetic interference suppression according to claim 6, characterized in that: The self-healing metallization layer (15) is made of zinc-aluminum alloy.

8. A safety capacitor for electromagnetic interference suppression according to claim 1, characterized in that: The first arc-shaped explosion-proof protrusion (4) and the second arc-shaped explosion-proof protrusion (12) are arranged at equal intervals on the encapsulation shell (5), and the inner sidewalls of the first arc-shaped explosion-proof protrusion (4) and the second arc-shaped explosion-proof protrusion (12) are both provided with polyurethane foam coating.

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