A lightning protection box for power supply

Abstract

This utility model discloses a power surge protection box, including a box body and a surge protection module, with a door rotatably connected to the front wall of the box body. This utility model employs a composite heat dissipation design, featuring a PCM heat-absorbing block with a honeycomb-shaped filling cavity filled with phase change paraffin wax and a heat-conducting support, to rapidly absorb transient high-temperature pulse energy during lightning current discharge. This solves the problem of traditional air-cooled systems being unable to respond to microsecond-level temperature rises due to thermal inertia, and prevents thermal failure of the core components of the surge protection module before the temperature-controlled circuit breaker trips. By utilizing the coordinated airflow guidance of the bottom air shroud and heat dissipation fins, forced airflow is concentrated and directed to the air duct formed between the heating area and the rear wall of the box body, overcoming the heat dissipation delay problem caused by airflow dispersion and ensuring rapid dissipation of residual heat after a lightning strike.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection technology, and in particular to a power supply lightning protection box. Background Technology

[0002] Surge protection boxes are classified into power surge protection boxes and signal surge protection boxes according to the different objects they protect; power surge protection boxes are the most common, and according to the connection method, they include two types: series type and parallel type.

[0003] Power surge protection boxes are equipped with power indicators, surge protection indicators, degradation alarms and indicators, lightning strike counters, and surge protection fuses, and can be widely used for main power supply protection in systems such as communications, power, transportation, finance, railways, and civil aviation. One publicly disclosed power surge protection box includes: a box body; a surge protector disposed inside the box body; and a heat dissipation mechanism disposed outside the surge protector and connected to the box body for heat dissipation of the box body. The heat dissipation mechanism includes: a control component disposed inside the box body for driving airflow within the box body; a heat dissipation assembly connected to the control component for cooperating with the control component to dissipate heat from the air inside the box body; and an air blowing assembly disposed outside the box body and connected to the control component. By incorporating the heat dissipation mechanism, the heat dissipation assembly, in conjunction with the control component and the air blowing assembly, can rapidly cool the air inside the box body, thereby improving the stability and safety of the equipment during use.

[0004] However, while the power supply surge protection box does not generate significant heat under normal operating conditions, it will produce microsecond-level high-temperature pulses due to the transient Joule effect when discharging lightning current. Currently, the main solution is to cut off the circuit when it is overheated by temperature-controlled circuit breakers or fuses, but the response is delayed and cannot completely avoid instantaneous high-temperature damage. The above structure cannot solve this problem, so it is necessary to further improve its structure. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a power surge protection box.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a power surge protection box, including a box body and a surge protection module, a box door is rotatably connected to the front wall of the box body, a second louver and a first louver are respectively provided on the left and right side walls of the box body, a blower cooling structure is provided inside the box body near the first louver, a heat-conducting bracket is fixedly connected to the inner rear wall of the box body, a PCM heat-absorbing block is fixedly connected to the front wall of the heat-conducting bracket, the surge protection module is fixedly connected to the front wall of the PCM heat-absorbing block, a honeycomb-shaped filling cavity is provided inside the PCM heat-absorbing block and the filling cavity is filled with phase change paraffin, a flow guiding structure for guiding airflow to the space between the heat-conducting bracket and the rear wall of the box body is fixedly connected to the lower wall of the heat-conducting bracket, and a temperature sensor is fixedly connected to the inner left wall of the box body within the range of the second louver.

[0007] As a further description of the above technical solution:

[0008] The second louver is located on the left wall of the box and near the top, while the first louver is located on the right wall of the box and near the bottom.

[0009] As a further description of the above technical solution:

[0010] The cooling structure is a cooling fan, which is fixedly connected to the right inner wall of the box and is opposite to the inside and outside of the first louver.

[0011] As a further description of the above technical solution:

[0012] The airflow guiding structure is an air hood, which is fixedly connected to the inner rear wall of the box and located below the heat conduction support. The air hood is located between the lower right corner of the heat conduction support and the air blowing heat dissipation structure. An air duct is provided on the rear wall of the air hood, with one end of the air duct facing the air blowing heat dissipation structure and the other end facing between the rear wall of the heat conduction support and the inner rear wall of the box.

[0013] As a further description of the above technical solution:

[0014] The front wall of the heat-conducting bracket is provided with a groove, and the PCM heat-absorbing block is fixedly connected to the inner side wall of the groove. Thermally conductive adhesive is filled between the PCM heat-absorbing block and the inner side wall of the groove, as well as between the PCM heat-absorbing block and the lightning protection module.

[0015] As a further description of the above technical solution:

[0016] The rear wall of the heat-conducting bracket is provided with multiple sets of parallel heat dissipation fins, and the length direction of the heat dissipation fins is parallel to the line connecting the second louver and the first louver.

[0017] As a further description of the above technical solution:

[0018] The thermal conductivity of the heat-conducting bracket is ≥200W / (m·K).

[0019] This utility model has the following beneficial effects:

[0020] 1. Compared with existing technologies, this power surge protection box, through a composite heat dissipation design with a honeycomb-shaped filling cavity filled with a PCM heat-absorbing block and a heat-conducting bracket, can quickly absorb transient high-temperature pulse energy during lightning current discharge. This solves the problem that traditional air-cooled systems cannot respond to microsecond-level temperature rises due to thermal inertia, and avoids thermal failure of the core components of the surge protection module before the temperature-controlled circuit breaker operates.

[0021] 2. Compared with existing technologies, this power surge protector box utilizes the combined airflow guidance of the bottom air shroud and heat dissipation fins to concentrate and guide the forced airflow to the air duct formed by the heat-generating area and the rear wall of the box, overcoming the problem of heat dissipation delay caused by airflow dispersion and ensuring that residual heat after a lightning strike is quickly discharged. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a power surge protection box proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of a power surge protection box according to the present invention.

[0024] Figure 3 This is a schematic diagram of the front structure of the heat-conducting bracket of the power surge protection box proposed in this utility model.

[0025] Figure 4 This is a schematic diagram of the back structure of the heat-conducting bracket of a power surge protector box proposed in this utility model.

[0026] Figure 5 This is a schematic diagram of the wind duct structure of a power surge protector box proposed in this utility model.

[0027] Legend:

[0028] 1. Enclosure; 2. Enclosure door; 3. Second louver; 4. First louver; 5. Cooling fan; 6. Heat conduction bracket; 601. Groove; 602. Heat dissipation fins; 7. Surge protection module; 8. Air intake cover; 801. Air intake channel; 9. PCM heat absorption block; 10. Temperature sensor. 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] Reference Figures 1 to 5 The present invention provides a power surge protection box, which includes a box body 1 and a surge protection module 7. The front wall of the box body 1 is rotatably connected to a box door 2.

[0031] In order to establish an efficient convection heat dissipation channel, the left and right side walls of the enclosure 1 are respectively provided with a second louver 3 and a first louver 4. The second louver 3 is located on the left wall of the enclosure 1 and near the top, and the first louver 4 is located on the right wall of the enclosure 1 and near the bottom.

[0032] When the cooling fan 5 is running, it forms an upward airflow path from the bottom first louver 4 to the top second louver 3, effectively utilizing the principle of hot air rising to enhance the natural convection effect.

[0033] In order to achieve active heat dissipation control, a blowing heat dissipation structure is provided inside the housing 1 and near the first louver 4. The blowing heat dissipation structure is a cooling fan 5, which is fixedly connected to the inner right wall of the housing 1 and is opposite to the inner and outer sides of the first louver 4.

[0034] When the temperature sensor 10 detects that the temperature inside the chamber exceeds the set threshold, the cooling fan 5 starts and directly introduces cold air from outside into the chamber 1.

[0035] In order to construct a high heat conduction path, a heat-conducting bracket 6 is fixedly connected to the inner rear wall of the box 1. The thermal conductivity of the heat-conducting bracket 6 is ≥200W / (m·K).

[0036] When the surge protection module 7 generates transient high temperature, the heat is quickly conducted to the heat conduction bracket 6 through the PCM heat absorption block 9;

[0037] In order to increase the heat dissipation surface area, the rear wall of the heat conduction bracket 6 is provided with multiple sets of parallel heat dissipation fins 602, and the length direction of the heat dissipation fins 602 is parallel to the line connecting the second louver 3 and the first louver 4.

[0038] When airflow passes through the heat dissipation fins 602, their parallel arrangement can reduce wind resistance and form laminar flow, thereby improving heat dissipation efficiency.

[0039] To address the transient thermal shock issue, a PCM heat absorber block 9 is fixedly connected to the front wall of the heat-conducting bracket 6, and a surge protection module 7 is fixedly connected to the front wall of the PCM heat absorber block 9. The PCM heat absorber block 9 has a honeycomb-shaped filling cavity filled with phase change paraffin wax. A groove 601 is provided on the front wall of the heat-conducting bracket 6, and the PCM heat absorber block 9 is fixedly connected to the inner wall of the groove 601. Thermally conductive adhesive is filled between the PCM heat absorber block 9 and the inner wall of the groove 601, as well as between the PCM heat absorber block 9 and the surge protection module 7.

[0040] When lightning current discharge causes the lightning protection module 7 to heat up instantaneously, the PCM heat-absorbing block 9, which has a honeycomb-shaped filling cavity and is filled with phase change paraffin, absorbs a large amount of heat through the phase change process, and the thermally conductive adhesive ensures that the thermal resistance is minimized.

[0041] To optimize airflow organization, a flow guiding structure for guiding airflow between the heat-conducting bracket 6 and the rear wall of the housing 1 is fixedly connected to the lower wall of the heat-conducting bracket 6. The flow guiding structure is an air hood 8, which is fixedly connected to the inner rear wall of the housing 1 and located below the heat-conducting bracket 6. The air hood 8 is located between the lower right corner of the heat-conducting bracket 6 and the air-blowing heat dissipation structure. An air-guiding channel 801 is provided on the rear wall of the air hood 8. One end of the air-guiding channel 801 faces the air-blowing heat dissipation structure and the other end faces the space between the rear wall of the heat-conducting bracket 6 and the inner rear wall of the housing 1.

[0042] When the cooling fan 5 is running, the air shroud 8 directs more than 60% of the airflow into the area of ​​the heat sink fins 602 to avoid airflow short circuit.

[0043] In order to achieve temperature monitoring, a temperature sensor 10 is fixedly connected to the inner left wall of the box 1 and located within the range of the second louver 3.

[0044] When the temperature inside the chamber rises abnormally, the temperature sensor 10 can provide real-time feedback to the control system to activate the protection mechanism.

[0045] Working principle: When the cooling fan 5 is running, it forms an upward airflow path from the bottom first louver 4 to the top second louver 3, effectively utilizing the principle of hot air rising to enhance the natural convection effect; when the temperature sensor 10 detects that the temperature inside the box exceeds the set threshold, the cooling fan 5 starts and directly introduces external cold air into the box 1; when the surge protection module 7 generates transient high temperature, the heat is quickly conducted to the heat conduction bracket 6 through the PCM heat absorption block 9; when the airflow passes through the heat dissipation fins 602, their parallel arrangement can reduce wind resistance and form laminar flow, improving heat dissipation efficiency; when the surge protection module 7 heats up instantly due to lightning current discharge, the PCM heat absorption block 9, which has a honeycomb filling cavity and is filled with phase change paraffin, absorbs a large amount of heat through the phase change process, and the thermally conductive adhesive ensures that the thermal resistance is minimized; when the cooling fan 5 is running, the air duct 8 directs more than 60% of the airflow into the heat dissipation fins 602 area to avoid airflow short circuit; when the temperature inside the box rises abnormally, the temperature sensor 10 can provide real-time feedback to the control system to activate the protection mechanism.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present 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 the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lightning protection power supply cabinet, characterized in that: The enclosure includes a housing (1) and a lightning protection module (7). The front wall of the housing (1) is rotatably connected to a door (2). The left and right side walls of the housing (1) are respectively provided with a second louver (3) and a first louver (4). A cooling structure is provided inside the housing (1) and near the first louver (4). A heat-conducting bracket (6) is fixedly connected to the rear wall of the inner side of the housing (1). A PCM heat-absorbing block (9) is fixedly connected to the front wall of the heat-conducting bracket (6). The lightning protection module (7) is fixedly connected to the front wall of the PCM heat-absorbing block (9). A honeycomb-shaped filling cavity is provided inside the PCM heat-absorbing block (9) and the filling cavity is filled with phase change paraffin. A flow-guiding structure for guiding airflow to the space between the heat-conducting bracket (6) and the rear wall of the housing (1) is fixedly connected to the lower wall of the heat-conducting bracket (6). A temperature sensor (10) is fixedly connected to the left wall of the inner side of the housing (1) and within the range of the second louver (3).

2. The lightning protection power supply box according to claim 1, characterized in that: The second louver (3) is located on the left wall of the box (1) and near the top, while the first louver (4) is located on the right wall of the box (1) and near the bottom.

3. The lightning protection power supply box of claim 1, wherein: The cooling structure is a cooling fan (5), which is fixedly connected to the right inner wall of the housing (1) and is opposite to the first louver (4).

4. The power supply lightning protection box of claim 1, wherein: The airflow guiding structure is an air hood (8), which is fixedly connected to the inner rear wall of the box (1) and located below the heat conduction bracket (6). The air hood (8) is located between the lower right corner of the heat conduction bracket (6) and the air blowing heat dissipation structure. An air duct (801) is provided on the rear wall of the air hood (8). One end of the air duct (801) faces the air blowing heat dissipation structure and the other end faces between the rear wall of the heat conduction bracket (6) and the inner rear wall of the box (1).

5. The power supply lightning protection box of claim 1, wherein: The front wall of the heat-conducting bracket (6) is provided with a groove (601), the PCM heat-absorbing block (9) is fixedly connected to the inner wall of the groove (601), and the space between the PCM heat-absorbing block (9) and the inner wall of the groove (601) and between the PCM heat-absorbing block (9) and the lightning protection module (7) is filled with thermally conductive adhesive.

6. The power supply lightning protection box of claim 1, wherein: The rear wall of the heat-conducting bracket (6) is provided with multiple sets of parallel heat dissipation fins (602), and the length direction of the heat dissipation fins (602) is parallel to the line connecting the second louver (3) and the first louver (4).

7. The power lightning protection box of claim 1, wherein: The thermal conductivity of the heat-conducting bracket (6) is ≥200W / (m·K).

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