Fireproof circuit board
By employing a multi-layered fireproof structure and a precise fire extinguishing mechanism, the problem of limited fire protection measures for circuit boards has been solved, achieving effective protection and rapid fire suppression for circuit boards, thereby improving the safety and reliability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- RED BOARD JIANGXI CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-06-09
AI Technical Summary
When faced with external flame threats, existing circuit boards have limited and ineffective fire protection measures, which cannot effectively prevent the spread of flames. Furthermore, fire extinguishing devices have low precision or delayed response, leading to circuit board damage or component aging.
It adopts a multi-layer fireproof structure, including an asbestos fiber fireproof buffer layer, an aluminum hydroxide flame-retardant isolation layer, a flame-retardant epoxy resin layer and a deflector plate, combined with a heptafluoropropane fire extinguishing pack and a high-temperature breaking layer, forming a complete protective chain, and achieving precise fire extinguishing and early warning through temperature sensors and alarms.
It effectively prevents external flames from burning the circuit board, quickly suppresses the fire, reduces damage, maintains electrical safety, and improves emergency response capabilities.
Smart Images
Figure CN224331412U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit board technology, and in particular to a fireproof circuit board. Background Technology
[0002] In industrial control, precision electronic equipment, and power systems, circuit boards are core components, and their operational stability directly determines the overall reliability of the equipment. However, the external fire risks faced by circuit boards during use (such as fires in surrounding equipment, ignition from high ambient temperatures, and the spread of external open flames) have always been a critical issue affecting their safe operation.
[0003] Existing fire protection measures for circuit boards mostly focus on a single level of protection: some use flame-retardant materials to wrap the circuit board body, but this can only slow down the burning rate and cannot actively extinguish the fire. When external flames continue to act, the circuit board is still prone to carbonization and failure due to heat accumulation; some are equipped with independent fire extinguishing devices, but the fire extinguishing trigger accuracy is low, and the best fire extinguishing opportunity is often missed due to misjudgment or delayed response. Moreover, the fire extinguishing medium is easily affected by spatial diffusion after release, making it difficult to accurately act on the circuit board area; other designs use sealed shells to block flames, but the shell lacks an effective heat dissipation and fire extinguishing coordination mechanism. Under high temperature environments, it may accelerate the aging of circuit board components and even cause internal secondary failures. Utility Model Content
[0004] In order to overcome the shortcomings mentioned in the background art, this utility model provides a fireproof circuit board.
[0005] The technical solution is as follows: A fireproof circuit board includes a mounting base, a circuit board body, an asbestos fiber fireproof buffer layer, an aluminum hydroxide flame-retardant isolation layer, a flame-retardant epoxy resin layer, a flow guide plate, a circuit board wiring interface, and a fireproof cover. The circuit board body is mounted on the top of the mounting base. The circuit board wiring interface is integrated on the right end of the circuit board body. The asbestos fiber fireproof buffer layer is fixed on the mounting base and covers the upper area of the circuit board body. The aluminum hydroxide flame-retardant isolation layer is fixed on top of the asbestos fiber fireproof buffer layer. The flame-retardant epoxy resin layer is fixed on top of the aluminum hydroxide flame-retardant isolation layer. Multiple flow guide plates are vertically spaced above the flame-retardant epoxy resin layer through a slot structure. The top of the mounting base is sealed and fastened with a fireproof cover. The fireproof cover completely covers the circuit board body and the fireproof materials on top of it. A matching recess is opened on the right end of the fireproof cover, and the size of the recess is adapted to the circuit board wiring interface.
[0006] Furthermore, it also includes a mica sheet insulation layer, which is laid and fixed above the guide plate.
[0007] Furthermore, it also includes a heptafluoropropane fire extinguishing pack and a high-temperature breaking layer. The heptafluoropropane fire extinguishing pack is fixedly installed on the top of the mica sheet insulation layer. The bottom of the heptafluoropropane fire extinguishing pack is connected to the mica sheet insulation layer through multiple high-temperature breaking layers that are spaced apart, and the high-temperature breaking layers are embedded in the preset grooves of the mica sheet insulation layer.
[0008] Furthermore, through holes are provided on the left and right side walls of the fireproof cover at positions corresponding to the interval areas of the guide plate.
[0009] Furthermore, it also includes positioning rods. Multiple positioning rods are connected at intervals on both sides of the top of the mounting base. Matching locking holes are opened on both sides of the inner wall of the fireproof cover corresponding to the positions of the positioning rods. The positioning rods and locking holes form an interference fit.
[0010] Furthermore, it also includes a controller, a temperature sensor, and an alarm. The controller is embedded and fixed on the left side of the front wall of the fireproof cover. The signal acquisition end of the controller integrates a temperature sensor, and its signal output end is electrically connected to the alarm. The detection end of the temperature sensor is exposed on the outside of the fireproof cover.
[0011] Compared with the prior art, this utility model has the following advantages: 1. Through the multi-layer protective structure composed of fireproof cover, asbestos fiber fireproof buffer layer, aluminum hydroxide flame retardant isolation layer, flame retardant epoxy resin layer, etc., combined with the active fire extinguishing mechanism of heptafluoropropane fire extinguishing pack and high temperature crushing layer, a complete protective chain from external isolation to internal fire extinguishing is formed, which can effectively block external flames from burning the circuit board body and greatly improve the fire protection effect.
[0012] 2. The high-temperature fracture layer is embedded in the mica sheet insulation layer, which can accurately sense temperature changes. When the set threshold is reached, it triggers the release of extinguishing agent from the heptafluoropropane extinguishing pack. The channel formed by the guide plate can guide the extinguishing agent to evenly cover the circuit board area, quickly suppress the fire, and reduce the damage to the circuit board and components caused by the fire.
[0013] 3. The mica sheet insulation layer maintains good insulation at high temperatures, which can prevent short circuits on the circuit board and ensure electrical safety; the temperature sensor, controller and alarm can detect abnormal high temperatures in advance and issue an alarm, which can facilitate timely handling by the staff and further improve the safety and emergency response capability of the device. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0015] Figure 2 This is a three-dimensional structural diagram of the mounting base, positioning rod, and fireproof cover of this utility model.
[0016] Figure 3This is a three-dimensional structural diagram of the components of this utility model, including the asbestos fiber fireproof buffer layer, the aluminum hydroxide flame-retardant isolation layer, and the flame-retardant epoxy resin layer.
[0017] Figure 4 This is a schematic diagram of the planar mechanism of this utility model.
[0018] Figure 5 This is a schematic diagram of the exploded structure of this utility model.
[0019] Reference numerals: 1. Mounting base; 2. Circuit board body; 3. Asbestos fiber fireproof buffer layer; 4. Aluminum hydroxide flame-retardant isolation layer; 5. Flame-retardant epoxy resin layer; 6. Deflector plate; 7. Mica sheet insulation layer; 8. Heptafluoropropane fire extinguishing bag; 9. High-temperature breaking layer; 10. Positioning rod; 11. Circuit board wiring interface; 12. Fireproof cover; 13. Controller; 14. Temperature sensor; 15. Alarm; 16. Through hole. Detailed Implementation
[0020] The present invention will now be described in detail with reference to the accompanying drawings.
[0021] Example: A fire-resistant circuit board, such as Figures 1-5As shown, the device includes a mounting base 1, a circuit board body 2, an asbestos fiber fireproof buffer layer 3, an aluminum hydroxide flame-retardant isolation layer 4, a flame-retardant epoxy resin layer 5, a flow guide plate 6, a mica sheet insulation layer 7, a heptafluoropropane fire extinguishing bag 8, a high-temperature crushing layer 9, a circuit board wiring interface 11, and a fireproof cover 12. The circuit board body 2 is mounted on the top of the mounting base 1. The circuit board wiring interface 11 is integrated on the right end of the circuit board body 2. The asbestos fiber fireproof buffer layer 3 is bonded and fixed to the mounting base 1 with a flame-retardant adhesive. Covering the area above the circuit board body 2, the aluminum hydroxide flame-retardant isolation layer 4 is bonded and fixed above the asbestos fiber fireproof buffer layer 3 by high-temperature resistant silicone rubber. The flame-retardant epoxy resin layer 5 is bonded and fixed above the aluminum hydroxide flame-retardant isolation layer 4 by flame-retardant epoxy resin adhesive. Multiple guide plates 6 are vertically spaced above the flame-retardant epoxy resin layer 5 through a slot structure. The spacing between adjacent guide plates 6 is set to 5-10mm to form a through airflow and extinguishing agent channel. The top of the mounting base 1 is densely packed. A fireproof cover 12 is attached to the sealing connection. The fireproof cover 12 completely covers the circuit board body 2 and the fireproof materials on top of it. The right end of the fireproof cover 12 has a matching notch, the size of which is adapted to the circuit board wiring interface 11, so as to accommodate the circuit board wiring interface 11 while facilitating the plugging and unplugging of external cables. The mica insulation layer 7 is laid and fixed on top of the guide plate 6. A heptafluoropropane fire extinguishing bag 8 is fixedly installed on top of the mica insulation layer 7. The bottom of the heptafluoropropane fire extinguishing bag 8 is spaced out. Multiple high-temperature fracturing layers 9 are connected to the mica sheet insulation layer 7, and the high-temperature fracturing layers 9 are embedded in the preset grooves of the mica sheet insulation layer 7. The heptafluoropropane extinguishing bag 8 and the high-temperature fracturing layers 9 are located on the top layer of each fireproof material and are also covered and protected by the fireproof cover 12. The left and right side walls of the fireproof cover 12 are provided with through holes 16 corresponding to the interval areas of the guide plate 6. The through holes 16 correspond to the interval areas between the guide plate 6 to form a flow channel for airflow and extinguishing agent, thereby improving heat dissipation and extinguishing efficiency.
[0022] like Figures 2-3 As shown, it also includes positioning rods 10. Multiple positioning rods 10 are welded at intervals on the front and rear sides of the top of the mounting base 1. Matching locking holes are opened on the front and rear sides of the inner sidewall of the fireproof cover 12 corresponding to the positions of the positioning rods 10. The positioning rods 10 and the locking holes form an interference fit to realize the detachable sealing fixation of the fireproof cover 12 and the mounting base 1.
[0023] When an external fire occurs, the fireproof cover 12 acts as the first line of defense. Its sealed structure prevents external flames from directly contacting the internal circuit board body 2 and each fireproof layer. Simultaneously, its high-temperature resistance slows heat transfer inwards. The side wall through-holes 16, in conjunction with the vertically spaced channels formed by the guide plate 6, allow for initial heat dissipation through airflow. However, as the external flames continue to rise, increasing the internal temperature of the fireproof cover 12 and transferring it to the uppermost layer, the high-temperature fracture layer 9 above the mica insulation layer 7 breaks down upon sensing a set threshold of high temperature. This causes the extinguishing agent in the heptafluoropropane extinguishing pack 8 to be released. Guided by the through-channels formed by the guide plate 6, the released extinguishing agent flows evenly downwards, covering the lower structural layers and the area of the circuit board body 2. This rapidly extinguishes the fire by suppressing the combustion chain reaction. During this process, the mica insulation layer... Not only does it maintain insulation at high temperatures to prevent short circuits on the circuit board, but its embedded high-temperature fracture layer 9 structure also ensures the accuracy of fire extinguishing triggering. The flame-retardant epoxy resin layer 5 below resists flame erosion and maintains structural integrity with its own flame-retardant properties, preventing fire extinguishing agents and flames from damaging the inner layer. The aluminum hydroxide flame-retardant isolation layer 4 decomposes and absorbs heat when heated, releasing water vapor to dilute oxygen, while forming a molten covering layer to prevent the flame from spreading further downward. The asbestos fiber fireproof buffer layer 3 buffers the impact of the flame through its porous structure and reduces the transfer of heat to the circuit board body 2. The mounting base 1 serves as the load-bearing foundation, and together with the positioning rod 10 and the fireproof cover 12, the sealed connection ensures that all protective structures form a closed protective space. Finally, through the synergistic effect of each structure, it prevents external flames from burning the circuit board body 2, thus achieving effective protection for the circuit board.
[0024] like Figure 1 As shown, it also includes a controller 13, a temperature sensor 14, and an alarm 15. The controller 13 is embedded and fixed on the left side of the front wall of the fireproof cover 12. The signal acquisition end of the controller 13 integrates the temperature sensor 14, and its signal output end is electrically connected to the alarm 15. The detection end of the temperature sensor 14 is exposed on the outside of the fireproof cover 12 and is used to monitor the external ambient temperature in real time. When the external ambient temperature is detected to reach the preset warning threshold (corresponding to the abnormal high temperature characteristics in the early stage of the fire), the temperature sensor 14 converts the temperature signal into an electrical signal and transmits it to the controller 13. After signal processing, the controller 13 triggers the alarm 15 to issue an audible and visual alarm to warn the staff and prompt them to intervene in time. At the same time, the multi-layer fireproof structure inside the fireproof cover 12 simultaneously activates the protection mechanism to form a cooperative fireproof barrier for the circuit board body 2.
Claims
1. A fireproof circuit board, characterized by: The circuit board includes a mounting base (1), a circuit board body (2), an asbestos fiber fireproof buffer layer (3), an aluminum hydroxide flame-retardant isolation layer (4), a flame-retardant epoxy resin layer (5), a flow guide plate (6), a circuit board wiring interface (11), and a fireproof cover (12). The circuit board body (2) is mounted on the top of the mounting base (1). The circuit board wiring interface (11) is integrated on the right end of the circuit board body (2). The asbestos fiber fireproof buffer layer (3) is fixed on the mounting base (1) and covers the area above the circuit board body (2). The aluminum hydroxide flame-retardant isolation layer... (4) Fixed above the asbestos fiber fireproof buffer layer (3), the flame-retardant epoxy resin layer (5) is fixed above the aluminum hydroxide flame-retardant isolation layer (4), and multiple guide plates (6) are vertically spaced above the flame-retardant epoxy resin layer (5) through a slot structure. The top of the mounting base (1) is sealed and fastened with a fireproof cover (12). The fireproof cover (12) completely covers the circuit board body (2) and the fireproof materials above it. The right end of the fireproof cover (12) has a matching notch, and the size of the notch is compatible with the circuit board wiring interface (11).
2. A fire resistant circuit board as claimed in claim 1, wherein: It also includes a mica sheet insulation layer (7), which is laid and fixed on top of the guide plate (6).
3. A fire resistant circuit board as claimed in claim 2, wherein: the polymeric material is a thermoplastic material. It also includes a heptafluoropropane fire extinguishing pack (8) and a high-temperature breaking layer (9). The heptafluoropropane fire extinguishing pack (8) is fixedly installed on the top of the mica sheet insulation layer (7). The bottom of the heptafluoropropane fire extinguishing pack (8) is connected to the mica sheet insulation layer (7) through multiple high-temperature breaking layers (9) arranged at intervals, and the high-temperature breaking layer (9) is embedded in the preset groove of the mica sheet insulation layer (7).
4. A fire resistant circuit board as claimed in claim 3, wherein: the polymeric material is a thermoplastic material. The fireproof cover (12) has through holes (16) on its left and right side walls corresponding to the interval area of the guide plate (6).
5. A fire resistant circuit board as claimed in claim 4, wherein: the polymeric material is a thermoplastic material. It also includes positioning rods (10), and multiple positioning rods (10) are connected at intervals on both sides of the top of the mounting base (1). The inner side wall of the fireproof cover (12) is provided with matching locking holes on both sides corresponding to the positions of the positioning rods (10), and the positioning rods (10) and the locking holes form an interference fit.
6. A fire resistant circuit board as claimed in claim 5, wherein: the polymeric material is a thermoplastic material. It also includes a controller (13), a temperature sensor (14) and an alarm (15). The controller (13) is embedded and fixed on the left side of the front wall of the fireproof cover (12). The signal acquisition end of the controller (13) integrates the temperature sensor (14), and its signal output end is electrically connected to the alarm (15). The detection end of the temperature sensor (14) is exposed on the outside of the fireproof cover (12).