A self-deploying fire protection liner for a front cowling and method of use thereof

Abstract

The application discloses a self-deploying fire extinguishing protective inner lining of a front engine cover and a use method thereof, which comprises a composite protective inner lining, a temperature-sensitive self-deploying mechanism and a safety control mechanism, the composite protective inner lining is arranged on the inner side of the front engine cover and is matched with the shape of the inner side of the front engine cover, the composite protective inner lining comprises a low-melting-point temperature control response layer, an active fire extinguishing medium releasing layer and a high-temperature-resistant flexible suffocation layer, the active fire extinguishing medium releasing layer is internally provided with microcapsules and nano dry powder, the temperature-sensitive self-deploying mechanism comprises a distributed temperature-sensitive buckle and a gravity block, and the safety control mechanism comprises a temperature sensor, an ECU, a fuel pump control unit, a high-voltage circuit control unit and a V2X communication unit. The composite protective inner lining is arranged in situ on the inner side of the front engine cover, and is matched with the temperature-sensitive opening, the releasing of the fire extinguishing medium, the automatic falling and covering and the safety linkage control structure, so that the timeliness and safety of the engine compartment fire protection are improved.

Description

Technical Field

[0001] This invention relates to the field of automotive passive safety and fire protection technology, specifically to a self-deploying fire-extinguishing protective liner for the front engine hood and its application method. Background Technology

[0002] As the automotive industry moves towards higher power density and electrification, the engine compartment, as a concentrated area for fuel lines, high-temperature components, and electrical wiring harnesses, is receiving increasing attention for fire prevention. Fuel leaks, short circuits, or high-temperature ignition in the engine compartment can easily lead to fires.

[0003] Existing technologies still have the following shortcomings: Most existing vehicle-mounted fire suppression methods rely on manual intervention, typically requiring the hood to be opened for extinguishing a fire. This can easily lead to a rapid intensification of the fire due to the large influx of outside air, increasing the risk of fire extinguishing. The sound-insulating linings inside existing hoods usually only provide sound and heat insulation, offering little active protection. Furthermore, some linings tend to absorb oil stains after prolonged use, posing a risk of combustion. In addition, existing automatic fire suppression systems usually require additional brackets or piping, increasing vehicle weight and potentially conflicting with the existing lining installation space. Finally, existing electronic or mechanical triggering methods have limitations in reliability and response time, making it difficult to provide rapid protection in the initial stages of a fire.

[0004] Therefore, the present invention provides a self-deployable fire-extinguishing protective liner for the front nacelle canopy and its method of use. Summary of the Invention

[0005] The purpose of this invention is to provide a self-deployable fire-extinguishing protective liner for the front engine compartment canopy and its method of use, so as to solve the problems existing in the above-mentioned background art.

[0006] To achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution: a self-deployed fire extinguishing protective liner for the front hood, comprising a composite protective liner, a temperature-sensing self-deployment mechanism, and a safety control mechanism.

[0007] Furthermore, the composite protective liner is disposed on the inner side of the front hood and matches the shape of the inner side of the front hood; the composite protective liner is a flexible plate-like structure.

[0008] The composite protective liner includes, from bottom to top, a low melting point temperature-controlled response layer, an active fire extinguishing medium release layer, and a high-temperature resistant flexible asphyxiation layer. The low melting point temperature-controlled response layer is located at the bottom of the liner and faces the engine side. The active fire extinguishing medium release layer is located in the middle layer and contains microcapsules and nano-dry powder disposed around the microcapsules. The high-temperature resistant flexible asphyxiation layer is located at the top and faces the front hood metal plate.

[0009] The temperature-sensing self-deployment mechanism includes distributed temperature-sensing buckles and gravity blocks disposed around the composite protective liner. The distributed temperature-sensing buckles fix the composite protective liner to the inside of the front hood.

[0010] The safety control mechanism includes a temperature sensor, ECU, fuel pump control unit, high-voltage circuit control unit, and V2 communication unit located in the engine compartment.

[0011] Furthermore, the low-melting-point temperature control response layer is made of modified low-melting-point polyurethane thermosensitive polymer film, and the melting or cracking temperature of the low-melting-point temperature control response layer is 110℃~120℃.

[0012] Furthermore, the active fire extinguishing medium release layer is made of aramid nonwoven fabric, and the microcapsules and nano dry powder are loaded inside the aramid nonwoven fabric.

[0013] Furthermore, the high-temperature resistant flexible asphyxiation layer is made of high-silica fiber, and the high-temperature resistant flexible asphyxiation layer is densified to form a reverse barrier layer, and the high-silica fiber has a temperature resistance of not less than 1000℃.

[0014] Furthermore, the fire extinguishing material inside the microcapsule is perfluorohexanone, and the wall material of the microcapsule is melamine resin; the bursting temperature of the microcapsule is 130℃~140℃.

[0015] Furthermore, the melting temperature of the distributed temperature-sensing buckle is 110℃~120℃.

[0016] Furthermore, the temperature sensor sends a signal to the ECU when the engine compartment temperature reaches 100°C. The ECU is electrically connected to the fuel pump control unit, the high-voltage circuit control unit, and the V2 communication unit.

[0017] Another object of the present invention is to provide a method of using a self-deploying fire-extinguishing protective liner for the forward engine hood, comprising the following steps:

[0018] S1. The self-deployed fire-extinguishing protective liner of the front hood is fixed to the inside of the front hood using distributed temperature-sensing buckles.

[0019] S2. When the temperature inside the cabin rises to the trigger temperature of the low melting point temperature control response layer, the low melting point temperature control response layer breaks, exposing the active fire extinguishing medium release layer.

[0020] S3. As the temperature continues to rise, the microcapsules in the active fire extinguishing medium release layer burst due to heat, releasing perfluorohexanone and causing the nano dry powder to be sprayed out.

[0021] S4. After the distributed temperature sensing buckle fails, the self-deployed fire extinguishing protective liner of the front hood will detach from the front hood under the action of gravity and fall into the engine compartment to cover the fire area in the engine compartment.

[0022] S5. When the temperature inside the engine compartment reaches 100°C, the temperature sensor sends a signal to the ECU, the ECU issues a circuit breaker alarm, and controls the fuel pump control unit and high-voltage circuit control unit to shut down via bus commands. At the same time, it broadcasts the fire alarm ID to surrounding vehicles via the V2X communication unit.

[0023] The beneficial effects of this invention are:

[0024] This invention replaces the original sound insulation liner by placing a composite protective liner in situ inside the front hood. Through the combination of a low-melting-point temperature-controlled response layer, an active fire extinguishing medium release layer, and a high-temperature resistant flexible asphyxiation layer, the device can achieve temperature-sensing activation, release of fire extinguishing medium, and high-temperature isolation during the initial stage of a fire in the engine compartment. Through the cooperation of distributed temperature-sensing buckles and gravity blocks, the composite protective liner can automatically detach from the front hood and fall into the engine compartment to cover it, reducing the risk of manually opening the front hood to extinguish the fire. At the same time, through the setting of a safety control mechanism, it can promptly trigger a circuit breaker alarm, cut off fuel and high-voltage circuits, and send fire alarm information to surrounding vehicles when the temperature reaches a preset threshold, thereby improving the timeliness and safety of engine compartment fire protection. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart illustrating the working process of the self-deployed composite fire extinguishing and protection liner device for the front hood of the present invention.

[0027] Figure 2 This is the assembly drawing based on the front hood as described in this invention;

[0028] Figure 3 This is a schematic diagram of the built-in composite protective liner of the present invention;

[0029] Figure 4 This is a schematic diagram illustrating the working principle of the composite protective liner of the present invention;

[0030] Figure 5 This is a schematic diagram of the high-temperature suffocation-resistant layer covering the composite protective liner of the engine compartment after fire extinguishing according to the present invention;

[0031] Figure 6This is a schematic diagram of the temperature-sensing buckle structure for fixing the composite protective lining according to the present invention;

[0032] Figure 7 This is a schematic diagram of the counterweight structure in the composite protective liner of the present invention;

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Composite protective liner; 2. High-temperature resistant flexible asphyxiation layer; 3. Active fire extinguishing medium release layer; 4. Low melting point temperature control response layer; 5. Temperature-sensitive buckle; 6. Microcapsule; 7. Nano dry powder; 8. Head of temperature-sensitive buckle; 9. Composite protective liner; 10. Forked claw; 11. Stem; 12. Counterweight. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] See Figures 1 to 5 As shown, this embodiment provides a self-deployed fire-extinguishing protective liner for the front hood, including a composite protective liner 1, a temperature-sensing self-deployment mechanism, and a safety control mechanism.

[0038] The composite protective liner is disposed on the inside of the front hood and matches the shape of the inside of the front hood. The composite protective liner is a flexible plate-like structure used to replace the original acoustic insulation cotton installed on the inside of the front hood in situ. Preferably, the overall thickness of the composite protective liner is controlled to be 15mm to 20mm to accommodate the installation gap between the front hood and the powertrain.

[0039] The composite protective liner includes, from bottom to top, a low melting point temperature control response layer 4, an active fire extinguishing medium release layer 3, and a high-temperature resistant flexible asphyxiation layer 2.

[0040] The low-melting-point temperature-controlled response layer 4 is located at the bottom of the composite protective liner and faces the engine side. The low-melting-point temperature-controlled response layer 4 is made of a modified low-melting-point polyurethane thermosensitive polymer film, preferably with a thickness of 0.05 mm to 0.15 mm. The melting or rupture temperature of the low-melting-point temperature-controlled response layer 4 is 110℃ to 120℃. Under normal operating conditions, the low-melting-point temperature-controlled response layer 4 can encapsulate the fire extinguishing medium above it. When a fire occurs in the engine compartment and the temperature rises to its trigger temperature, the low-melting-point temperature-controlled response layer 4 undergoes thermal shrinkage and melts or ruptures, thereby exposing the active fire extinguishing medium 3 release layer located above it.

[0041] The active fire extinguishing medium release layer 3 is located in the middle layer. The active fire extinguishing medium release layer 3 is made of aramid nonwoven fabric, preferably a high-porosity aramid nonwoven fabric. The microcapsules 6 and nano-dry powder 7 are loaded within the aramid nonwoven fabric, and the nano-dry powder 7 is distributed around the microcapsules 6. Preferably, the particle size of the microcapsules 6 is 50μm to 200μm. The fire extinguishing material inside the microcapsules 6 is perfluorohexanone, the wall material of the microcapsules 6 is melamine resin, and the burst temperature of the microcapsules 6 is 130℃ to 140℃. When the low-melting-point temperature-controlled response layer melts or ruptures, the active fire extinguishing medium release layer is directly exposed to the heat flow environment. The microcapsules 6 burst upon heating, releasing perfluorohexanone, and simultaneously causing the surrounding nano-dry powder 7 to disperse.

[0042] The high-temperature resistant flexible asphyxiation layer 2 is located on the top layer and faces the forward engine compartment cover metal plate. The high-temperature resistant flexible asphyxiation layer 2 is made of high-silica fiber, preferably a high-silica fiber fabric with a basis weight of 600g / m² to 1000g / m², and the high-silica fiber has a temperature resistance of not less than 1000℃. The high-temperature resistant flexible asphyxiation layer 2 is densified to form a reverse barrier layer, used in conjunction with the active fire extinguishing medium release layer to release the fire extinguishing medium towards the engine compartment side; simultaneously, the high-temperature resistant flexible asphyxiation layer 2 also serves as the skeleton layer of the composite protective liner, and after the composite protective liner loses its fixed constraint, it unfolds downwards in conjunction with gravity blocks.

[0043] The temperature-sensing self-deployment mechanism includes distributed temperature-sensing clips 5 and gravity blocks fixedly connected to the periphery of the composite protective liner. The distributed temperature-sensing clips 5 secure the composite protective liner to the inside of the front engine hood. Preferably, the distributed temperature-sensing clips 5 are distributed at the four corners and edges of the front engine hood, and the melting temperature of the distributed temperature-sensing clips 5 is 110℃~120℃. When the heat flow from a local fire in the engine compartment rises to the inside of the front engine hood, the distributed temperature-sensing clips melt and fail, the composite protective liner detaches from the constraint of the front engine hood, and falls under its own weight and the action of the surrounding gravity blocks to cover the engine, battery, fuel line, and other accessory areas.

[0044] The safety control mechanism includes a temperature sensor, an ECU, a fuel pump control unit, a high-voltage circuit control unit, and a V2X communication unit, all located in the engine compartment. The temperature sensor sends a signal to the ECU when the engine compartment temperature reaches 100°C. The ECU is electrically connected to the fuel pump control unit, the high-voltage circuit control unit, and the V2X communication unit.

[0045] In this embodiment, the composite protective liner, the temperature-sensing self-deployment mechanism, and the safety control mechanism work together to enable the device to utilize the original installation space of the front hood to achieve temperature-sensing triggering, extinguishing medium release, overall descent coverage, and safety linkage control in the initial stage of a fire.

[0046] Example 2

[0047] This embodiment provides a method for using a self-deployed fire suppression protective liner for the front hood, applied to the self-deployed fire suppression protective liner for the front hood described in Embodiment 1, including the following steps:

[0048] S1. The self-deployed fire-extinguishing protective liner of the front hood is fixed to the inside of the front hood using distributed temperature-sensing buckles, so that the composite protective liner fits the shape of the inside of the front hood.

[0049] S2. When an initial fire occurs in the engine compartment, the heat flow rises to the inside of the front engine compartment cover. When the temperature inside the engine compartment rises to the trigger temperature of the low melting point temperature control response layer, the low melting point temperature control response layer undergoes thermal contraction and melts or ruptures, exposing the active fire extinguishing medium release layer.

[0050] S3. As the temperature continues to rise, the microcapsules 6 within the active fire extinguishing medium release layer burst due to heat, releasing perfluorohexanone and causing the nano-dry powder 7 to disperse. Because the high-temperature resistant flexible asphyxiation layer is densified to form a reverse barrier layer, the medium released after the microcapsules 6 burst sprays towards the inside of the engine compartment.

[0051] S4. After the distributed temperature sensing buckle fails, the self-deployed fire extinguishing and protective liner of the front engine hood detaches from the front engine hood under its own weight and the action of the surrounding gravity blocks and falls into the engine compartment in a "curtain-like" cascade manner, covering the engine, battery, oil pipeline network and fire area.

[0052] S5. When the temperature inside the engine compartment reaches the preset threshold of 100°C, the temperature sensor sends a signal to the ECU, the ECU issues a circuit breaker alarm, and controls the fuel pump control unit and high-voltage circuit control unit to shut down via bus commands. At the same time, it broadcasts a fire alarm ID to surrounding vehicles via the V2X communication unit to prompt surrounding vehicles to slow down or avoid the area.

[0053] In this embodiment, the self-deployed fire-extinguishing protective liner of the front engine hood enables the low-melting-point temperature-controlled response layer to open, the active fire-extinguishing medium release layer to release the agent, the composite protective liner to fall and cover the entire structure, and the safety control mechanism to work together to form comprehensive protection against engine compartment fires after a fire occurs.

Claims

1. A self-deployed fire-extinguishing protective liner for a forward engine hood, comprising a composite protective liner, a temperature-sensing self-deployment mechanism, and a safety control mechanism, characterized in that: The composite protective liner is disposed on the inside of the front hood and matches the shape of the inside of the front hood. The composite protective liner is a flexible plate-like structure. The composite protective liner includes, from bottom to top, a low melting point temperature-controlled response layer, an active fire extinguishing medium release layer, and a high-temperature resistant flexible asphyxiation layer. The low melting point temperature-controlled response layer is located at the bottom of the liner and faces the engine side. The active fire extinguishing medium release layer is located in the middle layer and contains microcapsules and nano-dry powder disposed around the microcapsules. The high-temperature resistant flexible asphyxiation layer is located at the top and faces the front hood metal plate. The temperature-sensing self-deployment mechanism includes distributed temperature-sensing buckles and gravity blocks disposed around the composite protective liner. The distributed temperature-sensing buckles fix the composite protective liner to the inside of the front hood. The safety control mechanism includes a temperature sensor, ECU, fuel pump control unit, high-voltage circuit control unit, and V2 communication unit located in the engine compartment.

2. The self-deploying fire-extinguishing protective liner for the front engine compartment canopy according to claim 1, characterized in that, The low-melting-point temperature control response layer is made of modified low-melting-point polyurethane thermosensitive polymer film, and the melting or cracking temperature of the low-melting-point temperature control response layer is 110℃~120℃.

3. The self-deploying fire-extinguishing protective liner for the front nacelle canopy according to claim 1, characterized in that, The active fire extinguishing medium release layer is made of aramid nonwoven fabric, and the microcapsules and nano dry powder are loaded inside the aramid nonwoven fabric.

4. The self-deploying fire-extinguishing protective liner for the front engine compartment canopy according to claim 1, characterized in that, The high-temperature resistant flexible asphyxiation layer is made of high-silica fiber. The high-temperature resistant flexible asphyxiation layer is densified to form a reverse barrier layer. The high-silica fiber has a temperature resistance of not less than 1000℃.

5. The self-deploying fire-extinguishing protective liner for the front engine compartment canopy according to claim 1, characterized in that, The fire extinguishing material inside the microcapsule is perfluorohexanone, and the wall material of the microcapsule is melamine resin; the bursting temperature of the microcapsule is 130℃~140℃.

6. The self-deploying fire-extinguishing protective liner for the front fuselage canopy according to claim 1, characterized in that, The melting temperature of the distributed temperature-sensing buckle is 110℃~120℃.

7. The self-deploying fire-extinguishing protective liner for the front engine compartment canopy according to claim 1, characterized in that, The temperature sensor sends a signal to the ECU when the engine compartment temperature reaches 100°C. The ECU is electrically connected to the fuel pump control unit, the high-voltage circuit control unit, and the V2 communication unit.

8. A method of using the self-deploying fire-extinguishing protective liner of the forward engine compartment canopy as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. The self-deployed fire-extinguishing protective liner of the front hood is fixed to the inside of the front hood using distributed temperature-sensing buckles. S2. When the temperature inside the cabin rises to the trigger temperature of the low melting point temperature control response layer, the low melting point temperature control response layer breaks, exposing the active fire extinguishing medium release layer. S3. As the temperature continues to rise, the microcapsules in the active fire extinguishing medium release layer burst due to heat, releasing perfluorohexanone and causing the nano dry powder to be sprayed out. S4. After the distributed temperature sensing buckle fails, the self-deployed fire extinguishing protective liner of the front hood will detach from the front hood under the action of gravity and fall into the engine compartment to cover the fire area in the engine compartment. S5. When the temperature inside the engine compartment reaches 100°C, the temperature sensor sends a signal to the ECU, the ECU issues a circuit breaker alarm, and controls the fuel pump control unit and high-voltage circuit control unit to shut down via bus commands. At the same time, it broadcasts the fire alarm ID to surrounding vehicles via the V2X communication unit.

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