Surge protection device with large through-flow capacity and socket assembly thereof

Abstract

According to the surge protection device with large through-flow capacity and the socket assembly thereof provided by the utility model, heat generated by the surge protection device is rapidly conducted to the heat dissipation fins through direct abutting of the insulating heat conduction plate and the electrode, and the peripheral side of the contact surface of the heat dissipation fins and the insulating heat conduction plate is in a wave shape and forms through-flow holes, so that the heat dissipation area is increased, and the service life of the surge protection device is prolonged. Heat is taken away through air convection, so that the heat conduction efficiency and the heat dissipation efficiency of the surge protection device are effectively improved, and the situation that the service life of the surge protection device is shortened or combustion is caused due to the fact that the local temperature of the surge protection device is too high is avoided; and meanwhile, the first flame-retardant plate is arranged at the bottom of the shell and the second flame-retardant plate is arranged on the inner side of the cover plate, so that flame propagation and shell combustion can be blocked in case of fire, and the use safety of the surge protection device is further guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of surge protector technology, and in particular to a surge protector with large current capacity and its socket assembly. Background Technology

[0002] High current capacity is one of the core indicators of surge protectors, referring to the maximum surge current that the surge protector can withstand for the equipment. In large industrial settings, equipment such as transformers and frequency converters are susceptible to surges induced by lightning strikes, requiring surge protectors with a current capacity of 80kA to 150kA or higher to protect the equipment.

[0003] As a representative of high-current surge protectors, graphite gap surge protectors utilize multiple layers of graphite sheets as discharge gaps, achieving step-by-step discharge through stacking technology. Their current carrying capacity can reach 100kA~200kA (8 / 20μs waveform) or even higher, capable of absorbing the strong current surges generated by direct lightning strikes, far exceeding the current carrying capacity of traditional varistor-type SPDs.

[0004] However, graphite materials generate instantaneous high temperatures during breakdown discharge, and their tightly stacked multilayer structure makes it difficult for heat to dissipate quickly, easily leading to localized overheating. Simultaneously, high-temperature arcs may be generated between graphite gaps due to high-voltage breakdown, potentially igniting internal components of the surge protector and causing a fire, thus resulting in a safety accident.

[0005] Therefore, it is necessary to use a surge protector with a large current capacity that has good heat dissipation and flame retardant properties. Utility Model Content

[0006] Based on the requirements for heat dissipation and flame retardancy in existing surge protectors with large current capacity, this utility model provides a surge protector with large current capacity.

[0007] A surge protector with high current capacity includes a graphite gap module, a heat dissipation module, a housing accommodating the graphite gap module and the heat dissipation module, and a cover plate. The housing has an opening at one end, and the cover plate seals the opening. A first flame-retardant plate is provided at the bottom of the housing. A second flame-retardant plate is provided on the inner side of the cover plate. The graphite gap module is located above the first flame-retardant plate and includes a base and a top seat. A graphite gap assembly is clamped and fixed between the base and the top seat. An electrode is provided on each side of the base, with the electrode pins extending out of the housing, and the inner ends of the electrodes forming a surface contact electrical connection with the graphite gap assembly. The graphite gap assembly includes several graphite sheets arranged side by side, with a high-temperature resistant insulating sheet between each adjacent graphite sheet. A first circuit board electrically connected to the graphite gap assembly is located above the top seat. The upper and lower surfaces of the first circuit board are provided with several metal spring pins that are respectively in elastic contact with the graphite sheets. Several voltage-equalizing capacitors corresponding to the metal spring pins are electrically connected to the first circuit board. The heat dissipation module includes a pair of insulating heat-conducting plates that abut against the electrodes. Several heat dissipation fins are evenly arranged on the side of the insulating heat-conducting plates away from the electrodes. The outer periphery of the contact surface between the heat dissipation fins and the insulating heat-conducting plates is wavy, forming a flow passage between the heat dissipation fins and the insulating heat-conducting plates.

[0008] Furthermore, the bottom of the housing and the inner side of the cover plate are provided with a plurality of columnar protrusions, and the first flame-retardant plate and the second flame-retardant plate are provided with round holes corresponding to the columnar protrusions one by one, and the round holes are used to fit onto the columnar protrusions.

[0009] Furthermore, the first flame-retardant plate and the second flame-retardant plate have the same structure, and both the first flame-retardant plate and the second flame-retardant plate have a cavity filled with thermally conductive filler.

[0010] Furthermore, the high-temperature resistant insulating sheet is an alumina ceramic sheet, and the heat dissipation fins are copper heat dissipation fins.

[0011] Furthermore, both the housing and the cover are made of polybutylene terephthalate.

[0012] Furthermore, several heat dissipation holes are provided on both sides of the outer shell, and the heat dissipation holes are arranged corresponding to the heat dissipation fins, and each heat dissipation hole is provided with a filter screen.

[0013] Furthermore, a plurality of limiting blocks are provided on the inner side of the housing, and the limiting blocks abut against the graphite gap module.

[0014] Furthermore, the sides of both ends of the electrode are respectively attached to the base and the top seat, and are fixedly connected to the base and the top seat by screws.

[0015] Furthermore, the outer sides of the housing are provided with several strip-shaped grooves and a U-shaped opening to facilitate insertion and removal of the housing.

[0016] This utility model also provides a socket assembly, characterized in that it includes a base, on which a plug hole for electrical connection with a line is provided, the plug hole being used for plugging in the electrode pins of a surge protector with a large current capacity as described above.

[0017] The beneficial effects of this utility model are as follows: This utility model provides a surge protector with a large current capacity. The insulating heat-conducting plate directly contacts the electrode, allowing the heat generated by the surge protector to be quickly conducted to the heat dissipation fins. Furthermore, the outer periphery of the contact surface between the heat dissipation fins and the insulating heat-conducting plate is wavy, forming flow holes, thereby increasing the heat dissipation area. Air convection is used to remove heat, effectively improving the heat conduction and heat dissipation efficiency of the surge protector and preventing localized overheating that could shorten its lifespan or cause combustion. Simultaneously, by setting a first flame-retardant plate at the bottom of the housing and a second flame-retardant plate inside the cover, the propagation of flames and combustion of the housing can be blocked in the event of fire, further ensuring the safety of the surge protector. It also provides oxygen barrier and prevents the diffusion of combustible gases. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of a surge protector with large current capacity provided by this utility model;

[0019] Figure 2 A side view of a surge protector with large current capacity provided by this utility model;

[0020] Figure 3 A schematic diagram of the internal structure of a surge protector with large current capacity provided by this utility model;

[0021] Figure 4 This is a schematic diagram of the side structure of the heat dissipation fins;

[0022] Figure 5 A schematic diagram of the structure of the shell and the first flame-retardant plate provided by this utility model;

[0023] Figure 6 A schematic diagram of the structure of the cover plate and the second flame-retardant plate provided by this utility model;

[0024] Figure 7 A schematic diagram of a socket assembly provided by this utility model.

[0025] Attached Figure

[0026] 1. Housing; 2. Cover plate; 3. First flame-retardant plate; 4. Second flame-retardant plate; 5. Columnar protrusion; 6. Circular mounting hole; 7. Base; 8. Top seat; 9. Graphite gap assembly; 901. Graphite sheet; 902. High-temperature resistant insulating sheet; 10. Electrode; 101. Pin; 11. First circuit board; 12. Metal spring pin; 13. Voltage equalizing capacitor; 14. Insulating heat-conducting plate; 15. Heat dissipation fins; 16. Flow hole; 17. Limiting block; 18. Strip groove; 19. U-shaped opening; 20. Seat body; 21. Insertion hole; 22. Heat dissipation hole. Detailed Implementation

[0027] To provide a more detailed description of this utility model, the following description is provided in conjunction with the accompanying drawings. It should be noted that the embodiments described below are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0028] refer to Figure 1 and Figure 3 As shown, a surge protector with high current capacity includes a graphite gap module, a heat dissipation module, a housing 1 housing the graphite gap module and the heat dissipation module, and a cover plate 2. In this embodiment, both the housing 1 and the cover plate 2 are made of polybutylene terephthalate (PET). PET material can prevent deformation and insulation degradation caused by high temperatures from electric arcs, has good flame retardant properties, and also possesses sufficient strength.

[0029] The housing 1 has an opening at one end, and the cover plate 2 is used to seal the opening of the housing 1. The bottom of the housing 2 is provided with a first flame-retardant plate 3, and the inner side of the cover plate is provided with a second flame-retardant plate 4. In this embodiment, both the first flame-retardant plate 3 and the second flame-retardant plate 4 are made of glass fiber reinforced flame-retardant PC material.

[0030] The first flame-retardant plate 3 at the bottom of the housing 1 and the second flame-retardant plate 4 on the inner side of the cover plate 2 form a double flame-retardant barrier. When exposed to fire, this effectively blocks the spread of flames and the combustion of the housing 1 and cover plate 2, giving the surge protector excellent flame-retardant performance and further ensuring the safety of its use. The glass fiber reinforced flame-retardant PC material combines the reinforcing toughness of glass fiber with the high-temperature resistance of PC. The resulting flame-retardant plate can withstand high temperatures without melting or dripping, thus slowing the spread of fire.

[0031] The shell 1 and the inner side of the cover plate 2 are provided with a plurality of columnar protrusions 5. The first flame-retardant plate 3 and the second flame-retardant plate 4 are each provided with a circular hole 6 corresponding to the columnar protrusions 5. The circular hole 6 is used to fit onto the columnar protrusions 5. The first flame-retardant plate 3 and the second flame-retardant plate 4 are fixedly installed by fitting the circular holes 6 of the first flame-retardant plate 3 and the second flame-retardant plate 4 onto the bottom and the inner side of the cover plate 1 respectively.

[0032] The first flame-retardant plate 3 and the second flame-retardant plate 4 have the same structure, and both the first flame-retardant plate 3 and the second flame-retardant plate 4 have a cavity (not shown in the figure), which is filled with a thermally conductive filler (not shown in the figure). In this embodiment, the thermally conductive filler is spherical alumina.

[0033] The thermally conductive filler ensures good thermal conductivity of the flame-retardant plate during normal use, further enhancing the heat dissipation performance of the surge protector. The cavity is filled with spherical alumina particles; their spherical structure maximizes the filler density, improves thermal conductivity, and accelerates the transfer of heat from the equipment's interior to the exterior.

[0034] The graphite gap module is located above the first flame-retardant plate 3, and includes a base 7 and a top seat 8. A graphite gap assembly 9 is clamped and fixed between the base 7 and the top seat 8. An electrode 10 is provided on each side of the base 7, and the pins 101 of the electrode 10 extend out of the housing 1. The inner ends of the electrodes 10 are all electrically connected to the graphite gap assembly 9 in a surface contact manner. The graphite gap assembly 9 includes several graphite sheets 901 arranged side by side, and a high-temperature resistant insulating sheet 902 is provided between each adjacent graphite sheet 901. A first circuit board 11 electrically connected to the graphite gap assembly 9 is provided above the top seat 8. Several metal spring pins 12 are welded to the upper and lower surfaces of the first circuit board 11, which are in elastic contact with the graphite sheets 901. Several equalizing capacitors 13 corresponding to the metal spring pins 12 are electrically connected to the first circuit board 11. In this embodiment, the high-temperature resistant insulating sheet 902 is an alumina ceramic sheet.

[0035] The metal spring pin 12 on the lower surface of the first circuit board contacts the graphite sheet 901 in the graphite gap assembly 9 to form a wiring circuit. The electrodes 10 on both sides of the graphite gap assembly 9 are connected to the power supply. The metal spring pin 12 is connected to the voltage equalization capacitor 13, forming two sets of left-right symmetrical surge protection circuits in the surge protector. The surge passes from one electrode 10 of the graphite gap assembly 9 to the other electrode 10, through the graphite sheet 901 and the insulating sheet 902, and then through the metal spring pin 12 to the corresponding voltage equalization capacitor 13, thus forming surge protection.

[0036] In this embodiment, the sides of both ends of the electrode 10 are respectively attached to the base 7 and the top seat 8, and are fixedly connected to the base 7 and the top seat 8 by screws.

[0037] The heat dissipation module includes a pair of insulating heat-conducting plates 14 that abut against the electrodes 10. A plurality of heat dissipation fins 15 are arranged in an array on the side of the insulating heat-conducting plates 14 away from the electrodes 10. The outer periphery of the contact surface between the heat dissipation fins 15 and the insulating heat-conducting plates 14 is wavy, forming flow holes 16 between the heat dissipation fins 15 and the insulating heat-conducting plates 14. In this embodiment, the heat dissipation fins 15 are copper heat dissipation fins. In this embodiment, the insulating heat-conducting plates 14 are fixed to the bottom of the housing 1.

[0038] By directly contacting the electrode 10 with the insulating heat-conducting plate 14, the heat generated by the surge protector is quickly conducted to the heat dissipation fins 15. The outer periphery of the contact surface between the heat dissipation fins 15 and the insulating heat-conducting plate 14 is wavy and forms flow holes 16, thereby increasing the heat dissipation area and using air convection to remove heat. This effectively improves the heat conduction efficiency and heat dissipation efficiency of the surge protector, and avoids the surge protector's lifespan being shortened or causing combustion due to excessively high local temperature.

[0039] The outer sides of the housing 1 are provided with a plurality of heat dissipation holes 22, which are corresponding to the heat dissipation fins 15, and each heat dissipation hole 22 is provided with a filter screen (not shown in the figure).

[0040] The first heat dissipation holes 6 on both sides of the housing 1 form a through-ventilation channel, accelerating the exhaust of internal hot air. Combined with the active heat conduction of the insulating heat-conducting plate 15 and the heat dissipation fins 15, this creates a good heat dissipation mechanism, further preventing the accumulation of localized hot spots and improving the stability of the equipment under high-energy impacts or continuous operation. The built-in filter in the heat dissipation hole 22 can block dust, metal particles, and corrosive liquids from entering the housing, protecting the sensitive graphite gap module from contamination or short-circuit risks.

[0041] The inner side of the housing 1 is provided with a plurality of limiting blocks 17, and the limiting blocks 17 abut against the graphite gap module, and then cooperate with the insulating heat-conducting plate 14 to limit and fix the graphite gap module in the housing 1, so as to prevent the graphite gap module from shaking and shifting and affecting normal use.

[0042] The outer sides of the housing 1 are provided with several strip-shaped grooves 18 and a U-shaped opening 19 to facilitate insertion and removal of the housing 1. The strip-shaped grooves 18 can increase the friction between the insertion / removal hand and the housing 1, and the U-shaped opening 19 facilitates the insertion / removal fingers to apply pressure to the outside of the housing, which helps to improve insertion and removal efficiency.

[0043] refer to Figure 7As shown, the present invention also provides a socket assembly, including a base 20, on which a plug hole 21 for electrical connection with a line is provided. The plug hole 21 is used for plugging in the pin 101 of the electrode 10 of a surge protector with a large current capacity as described above.

[0044] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model and do not limit the utility model to the specific implementations described. Obviously, other modifications and variations can be made based on the content of this specification. The embodiments selected and specifically described in this specification are intended to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. They are not intended to limit the utility model, and any simple modifications to this utility model fall within the protection scope of this utility model.

Claims

1. A surge protector with high current capacity, characterized in that, It includes a graphite gap module, a heat dissipation module, a housing that accommodates the graphite gap module and the heat dissipation module, and a cover plate; The housing has an opening at one end, the cover plate is used to seal the opening of the housing, and the bottom of the housing is provided with a first flame-retardant plate; a second flame-retardant plate is provided on the inner side of the cover plate; The graphite gap module is located above the first flame-retardant plate, and the graphite gap module includes a base and a top seat, with a graphite gap assembly clamped and fixed between the base and the top seat; an electrode is provided on each side of the base, the pins of the electrode extend out of the housing, and the inner ends of the electrode form a surface contact electrical connection with the graphite gap assembly; the graphite gap assembly includes several graphite sheets arranged side by side, and a high-temperature resistant insulating sheet is provided between adjacent graphite sheets; a first circuit board is provided above the top seat and is electrically connected to the graphite gap assembly, and several metal spring pins are welded to the upper and lower surfaces of the first circuit board, which are respectively in elastic contact with the graphite sheets, and several voltage equalizing capacitors are electrically connected to the first circuit board and are correspondingly connected to the metal spring pins; The heat dissipation module includes a pair of insulating heat-conducting plates that abut against the electrodes. Several heat dissipation fins are arranged in an array on the side of the insulating heat-conducting plates away from the electrodes. The outer periphery of the contact surface between the heat dissipation fins and the insulating heat-conducting plates is wavy, so that flow holes are formed between the heat dissipation fins and the insulating heat-conducting plates.

2. A surge protector with high current capacity according to claim 1, characterized in that, The bottom of the housing and the inner side of the cover plate are provided with a number of columnar protrusions. The first flame-retardant plate and the second flame-retardant plate are provided with round holes that correspond one-to-one with the columnar protrusions. The round holes are used to fit onto the columnar protrusions.

3. A surge protector with high current capacity according to claim 1, characterized in that, The first flame-retardant plate and the second flame-retardant plate have the same structure, and both the first flame-retardant plate and the second flame-retardant plate have a cavity filled with thermally conductive filler.

4. A surge protector with large current capacity according to claim 1, characterized in that, The high-temperature resistant insulating sheet is an alumina ceramic sheet, and the heat dissipation fins are copper heat dissipation fins.

5. A surge protector with high current capacity according to claim 1, characterized in that, Both the shell and the cover are made of polybutylene terephthalate.

6. A surge protector with large current capacity according to claim 1, characterized in that, The outer sides of the housing are provided with a number of heat dissipation holes, which are arranged corresponding to the heat dissipation fins, and each heat dissipation hole is provided with a filter screen.

7. A surge protector with large current capacity according to claim 1, characterized in that, The inner surface of the housing is provided with a number of limiting blocks, and the limiting blocks abut against the graphite gap module.

8. A surge protector with large current capacity according to claim 1, characterized in that, The sides of the two ends of the electrode are respectively attached to the base and the top seat, and are fixedly connected to the base and the top seat by screws.

9. A surge protector with large current capacity according to claim 1, characterized in that, The outer sides of the housing are provided with several strip-shaped grooves and a U-shaped opening to facilitate insertion and removal of the housing.

10. A socket assembly, characterized in that, The device includes a base having a socket for electrical connection with a line, the socket being used for connecting the electrode pins of a surge protector with a large current capacity as described in any one of claims 1-9.

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