Fire extinguishing type water-tight room door and fire extinguishing method based on the water-tight room door

Abstract

The application discloses a fire-extinguishing type water-tight room door for a cabin and a fire-extinguishing method based on the water-tight room door and belongs to the technical field of ships, which comprises a door frame and a cabin door assembly. The cabin door assembly comprises a front cabin cover, a rear cabin cover, a lock and fireproof glass. A fireproof heat insulation layer is further arranged between the front cabin cover and the rear cabin cover and is attached to the front cabin cover. A plurality of fire-extinguishing holes are formed in the front cabin cover and the fireproof heat insulation layer and are distributed on the top, middle and bottom of the front cabin cover. A fire-extinguishing balloon is arranged in each fire-extinguishing hole and is located between the front cabin cover and the rear cabin cover and is filled with fire-retardant material. The fireproof heat insulation layer can effectively prevent fire and insulate heat because the fireproof heat insulation layer is arranged between the front cabin cover and the rear cabin cover. When the fire just spreads to the front of the cabin door assembly, the flame will quickly burn the fire-extinguishing balloon at the fire-extinguishing hole, and the fire-retardant material in the fire-extinguishing balloon can extinguish the fire in front of the cabin door assembly, thereby playing a role in preventing fire and actively extinguishing fire.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship technology, in particular to a fire extinguishing type water-tight room door for ship cabin and a fire extinguishing method based on the water-tight room door. BACKGROUND

[0002] The cabin of a ship has a high risk of fire due to the closed space and the concentration of combustible materials (such as electrical equipment, decorative materials, etc.). As a core component for fireproof separation between cabins, the water-tight room door needs to meet the requirements of water-tightness (to prevent seawater / jiangshui penetration) and fireproofness (to delay the spread of fire).

[0003] Traditional water-tight room doors are mostly made of metal materials (such as steel, aluminum alloy), which only block heat transfer through thick and heavy door body structure, but lack active fire extinguishing function. When the fire spreads to the surface of the cabin door, the traditional door body cannot actively intervene, and the flame may continue to spread through the weak parts such as door gaps and observation windows, leading to the expansion of the fire range and threatening the safety of personnel and the integrity of the ship. SUMMARY

[0004] The first technical problem to be solved by the present application is to provide a fire extinguishing type water-tight room door for ship cabin with fireproof and active fire extinguishing function and a fire extinguishing method based on the water-tight room door.

[0005] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0006] A fire extinguishing type water-tight room door for ship cabin, comprising a door frame fixed on a cabin body and a cabin door assembly rotatably installed on the door frame through multiple hinges on the left side;

[0007] The cabin door assembly comprises a front cabin cover located on the front side, a rear cabin cover detachably installed on the rear side of the front cabin cover, a lock fixedly installed between the front cabin cover and the rear cabin cover, and a visual fireproof glass installed on the rear cabin cover;

[0008] A fireproof thermal insulation layer is further installed between the front cabin cover and the rear cabin cover and adheres to the front cabin cover, and a plurality of fire extinguishing holes are formed on the front cabin cover and the fireproof thermal insulation layer and distributed on the top, middle and bottom of the front cabin cover, and a fire extinguishing balloon filled with fire-retardant material is installed in each fire extinguishing hole and located between the front cabin cover and the rear cabin cover, wherein the fire-retardant material is sprayed out of the fire extinguishing hole to extinguish the fire when the fire extinguishing balloon is burned and broken at the fire extinguishing hole.

[0009] By adopting the above-mentioned scheme, the fireproof thermal insulation layer is installed between the front cabin cover and the rear cabin cover, which can effectively prevent fire and insulate heat. When the fire just spreads to the front of the cabin door assembly, the flame will quickly burn and break the fire extinguishing balloon at the fire extinguishing hole, and the fire-retardant material in the fire extinguishing balloon will extinguish the fire in front of the cabin door assembly, thereby playing the role of fireproofing and active fire extinguishing.

[0010] The preferred embodiment of the fire extinguishing type cabin water-tight room door is characterized in that: a fire extinguishing balloon is arranged in a balloon cage, a hollow screw sleeve is arranged at the center of the balloon cage, the fire extinguishing balloon is partially arranged in the hollow screw sleeve, and the fire extinguishing balloon and the balloon cage are fixed in the fire extinguishing hole through the hollow screw sleeve, wherein the fire-retardant material in the fire extinguishing balloon is composed of high-pressure gas and fire-retardant powder.

[0011] By using the above scheme, the fire extinguishing balloon is placed in the balloon cage and fixed in the fire extinguishing hole through the hollow screw sleeve of the balloon cage, so that the subsequent disassembly and replacement are facilitated.

[0012] The fire extinguishing method based on the fire extinguishing type cabin water-tight room door is characterized in that: the fire extinguishing method is used for fire prevention and extinguishing by using the fire extinguishing type cabin water-tight room door, and the fire prevention and extinguishing method is as follows.

[0013] When the fire spreads to the front of the cabin door assembly, the fireproof and heat insulation layer arranged between the front hatch cover and the rear hatch cover can effectively prevent fire and insulation; at this time, the temperature of the front hatch cover rises, the fire will quickly burn the fire extinguishing balloon at the fire extinguishing hole, and then the fire-retardant powder will be sprayed out of the fire extinguishing hole under the push of the high-pressure gas, and finally the fire in front of the cabin door assembly will be extinguished by the fire-retardant powder.

[0014] The second technical problem to be solved by the present application is to provide a fire extinguishing type cabin water-tight room door which has higher locking strength and is not prone to abnormal noise after long-term use.

[0015] The preferred embodiment of the fire extinguishing type cabin water-tight room door is characterized in that: a fire extinguishing balloon is arranged in a balloon cage, a hollow screw sleeve is arranged at the center of the balloon cage, the fire extinguishing balloon is partially arranged in the hollow screw sleeve, and the fire extinguishing balloon and the balloon cage are fixed in the fire extinguishing hole through the hollow screw sleeve, wherein the fire-retardant material in the fire extinguishing balloon is composed of high-pressure gas and fire-retardant powder.

[0016] By using the above scheme, the fire extinguishing balloon is placed in the balloon cage and fixed in the fire extinguishing hole through the hollow screw sleeve of the balloon cage, so that the subsequent disassembly and replacement are facilitated.

[0017] In the preferred embodiment of the water-tight door for the fire-extinguishing cabin, the movable bolts include a movable bolt one at the middle of the right side of the rear hatch cover, a movable bolt two at the top of the right side of the rear hatch cover, a movable bolt three at the bottom of the right side of the rear hatch cover, a movable bolt four at the middle of the top of the left side of the rear hatch cover, and a movable bolt five at the middle of the bottom of the left side of the rear hatch cover, each of which is connected to a control socket rotatably installed on the rear hatch cover.

[0018] By the above scheme, in order to increase the fixing points of the cabin door assembly, five movable bolts are installed on the top, right and bottom sides, three of which are on the right side, and one on each of the top and bottom sides, thereby improving the locking strength of the cabin door assembly.

[0019] In the preferred embodiment of the water-tight door for the fire-extinguishing cabin, the control socket includes a control socket one fixedly connected to the movable bolt one, a control socket two fixedly connected to the movable bolt two, a control socket three fixedly connected to the movable bolt three, a control socket four fixedly connected to the movable bolt four, and a control socket five fixedly connected to the movable bolt five.

[0020] By the above scheme, in order to facilitate the control of the movement of the movable bolts, the five movable bolts are connected to the control sockets one by one, and the movement of the movable bolts is realized by rotating the control sockets.

[0021] In the preferred embodiment of the water-tight door for the fire-extinguishing cabin, the connecting rod includes a main connecting rod that rotatably connects the control socket one, the control socket two and the control socket three, a driven connecting rod one that rotatably connects the control socket two and the control socket four, and a driven connecting rod two that rotatably connects the control socket three and the control socket five.

[0022] By the above scheme, in order to facilitate the simultaneous control of the movement of the five movable bolts, the main connecting rod is actuated, and the five movable bolts are simultaneously inserted into the door frame through the transmission of the two driven connecting rods.

[0023] In the preferred embodiment of the water-tight door for the fire-extinguishing cabin, the control socket one is further connected to a bolt rocker one in front of the front hatch cover and a bolt rocker two behind the rear hatch cover, and the bolt rocker one and the bolt rocker two are concentrically connected.

[0024] By the above scheme, in order to facilitate the actuation of the main connecting rod, the control socket one is rotated by rotating the bolt rocker one at the front hatch cover, thereby driving the main connecting rod to move, and the five movable bolts are simultaneously inserted into the door frame; the control socket one is rotated by rotating the bolt rocker two at the rear hatch cover, thereby driving the main connecting rod to move, and the five movable bolts are simultaneously inserted into the door frame.

[0025] As a preferred embodiment of the fire extinguishing type cabin water-tight room door, the room door frame is protruded from the front side and the rear side of the cabin body, and the room door frame can seal and wrap the top side, the bottom side, the left side and the right side of the cabin door assembly.

[0026] By using the above scheme, in order to ensure that the cabin door assembly has good water tightness, the four sides of the cabin door assembly are sealed and wrapped by the room door frame as a whole, and the whole cabin door assembly is thick, which can effectively ensure that it has good water tightness.

[0027] The beneficial effects of the present application are:

[0028] 1. The front cabin cover and the rear cabin cover are provided with a fireproof heat insulation layer, which can effectively prevent fire and insulation; when the fire just spreads to the front of the cabin door assembly, the fire will quickly burn the fire extinguishing balloon at the fire extinguishing hole, and the fire-retardant material in the fire extinguishing balloon will extinguish the fire in front of the cabin door assembly, thereby playing a role in preventing fire and active fire extinguishing;

[0029] 2. In order to facilitate the installation of the fire extinguishing balloon, the fire extinguishing balloon is placed in the balloon cage and fixed in the fire extinguishing hole through the hollow sleeve of the balloon cage, thereby facilitating subsequent disassembly and replacement;

[0030] 3. On the basis of the traditional use of only a lock to lock the cabin door, five movable bolts distributed on the top side, the right side and the bottom side of the cabin door are added, and all the movable bolts can be assembled in the room door frame under the transmission of the connecting rod, thereby strengthening the cabin door structure and making the closed cabin door stronger. In this way, the cabin door has more fixed points, so that the cabin door is not easy to produce abnormal sound when the ship is sailing;

[0031] 4. In order to ensure that the cabin door assembly has good water tightness, the four sides of the cabin door assembly are sealed and wrapped by the room door frame as a whole, and the whole cabin door assembly is thick, which can effectively ensure that it has good water tightness. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0033] Figure 1 The front view of the fire extinguishing type cabin water-tight room door in the closed state Figure 1 ;

[0034] Figure 2 The rear view of the fire extinguishing type cabin water-tight room door in the closed state Figure 1 ;

[0035] Figure 3 A three-dimensional structural diagram showing the watertight compartment door of a fire-fighting ship's cabin when it is opened;

[0036] Figure 4 for Figure 1 Three-dimensional structure of the middle cabin door assembly Figure 1 ;

[0037] Figure 5 for Figure 1 Three-dimensional structure of the middle cabin door assembly Figure 2 ;

[0038] Figure 6 To showcase Figure 4 Location map of the fire-fighting balloons in China;

[0039] Figure 7 for Figure 6 A three-dimensional structural diagram of a fire-extinguishing balloon installed inside a balloon cage.

[0040] Figure 8 To showcase Figure 7 Structural diagram of the internal structure;

[0041] Figure 9 To showcase Figure 4 Location distribution diagram of various internal structures;

[0042] Figure 10 To showcase Figure 5 Location diagram of the five movable pins in the middle;

[0043] Markings in the diagram: 1-Hybrid; 2-Door frame; 3-Hinge; 4-Door assembly; 401-Forward hatch; 402-Rear hatch; 403-Lock; 404-Fireproof glass; 405-Fireproof insulation layer; 406-Fire extinguishing hole; 407-Fire extinguishing balloon; 408-Balloon cage; 409-Hollow screw sleeve; 410-Flame retardant material; 411-Modible pin one; 412-Modible pin two; 413-Modible pin three; 414-Modible pin four; 415-Modible pin five; 416-Control socket one; 417-Control socket two; 418-Control socket three; 419-Control socket four; 420-Control socket five; 421-Active linkage; 422-Driven linkage one; 423-Driven linkage two; 424-Pin rocker arm one; 425-Pin rocker arm two. Detailed Implementation

[0044] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0045] As shown in the Figures 1 to 8 embodiments, a fire extinguishing type water-tight room door for a cabin of a ship is provided, which is used in a cabin of a ship and specifically includes a door frame 2 fixed on a cabin body 1 and a cabin door assembly 4 rotatably installed on the door frame 2 through multiple hinges 3 on the left side; the cabin door assembly 4 includes a front cabin cover 401 located on the front side, a rear cabin cover 402 detachably installed on the rear side of the front cabin cover 401, a lock 403 fixedly installed between the front cabin cover 401 and the rear cabin cover 402, and a visual fireproof glass 404 installed on the rear cabin cover 402, which has a thickness of 8-10 mm; a fireproof and heat insulation layer 405 is further installed between the front cabin cover 401 and the rear cabin cover 402 and adheres to the front cabin cover 401, which has a thickness of 12-15 mm and is specifically rock wool or glass wool, and a plurality of fire extinguishing holes 406 distributed on the top, middle and bottom of the front cabin cover 401 are formed on the front cabin cover 401 and the fireproof and heat insulation layer 405, and a fire extinguishing balloon 407 filled with a fire-retardant material 410 and located between the front cabin cover 401 and the rear cabin cover 402 is installed in each fire extinguishing hole 406, which is made of PVC, wherein the fire-retardant material 410 is sprayed out of the fire extinguishing hole 406 to extinguish the fire when the fire extinguishing balloon 407 is burned and broken from the fire extinguishing hole 406. According to the present application, the fireproof and heat insulation layer 405 is installed between the front cabin cover 401 and the rear cabin cover 402, which can effectively prevent fire and insulation; when the fire just spreads to the front of the cabin door assembly 4, the flame will quickly burn and break the fire extinguishing balloon 407 at the fire extinguishing hole 406, and the fire-retardant material 410 in the fire extinguishing balloon 407 will extinguish the fire in front of the cabin door assembly 4, thereby playing a role in preventing fire and actively extinguishing fire.

[0046] As shown in the Figures 6 to 8As shown, the fire extinguishing balloon 407 is limitedly installed in the balloon cage 408, and a hollow sleeve 409 is connected at the center of the balloon cage 408; part of the fire extinguishing balloon 407 extends into the hollow sleeve 409, and the fire extinguishing balloon 407 is completely sealed in the hollow sleeve 409, and the entire fire extinguishing balloon 407 and the balloon cage are fixed in the fire extinguishing hole 406 through the hollow sleeve 409, and the water tightness in the fire extinguishing hole 406 is good enough; wherein the fire-retardant material 410 in the fire extinguishing balloon 407 is composed of high-pressure gas and fire-retardant powder, wherein the high-pressure gas is high-pressure nitrogen, and the fire-retardant powder is aluminum hydroxide or magnesium hydroxide. In order to facilitate the installation of the fire extinguishing balloon 407, the fire extinguishing balloon 407 is placed in the balloon cage 408, and is fixed in the fire extinguishing hole 406 through the hollow sleeve 409 of the balloon cage 408, thereby facilitating subsequent disassembly and replacement.

[0047] As shown in the Figures 4 to 8 fire extinguishing method based on the fire extinguishing type cabin water-tight room door, the method uses the above-mentioned fire extinguishing type cabin water-tight room door for fire prevention and fire extinguishing, and the method for fire prevention and fire extinguishing is as follows: when the fire just spreads to the front of the cabin door assembly 4, since the fireproof heat insulation layer 405 is installed between the front hatch cover 401 and the rear hatch cover 402, the fireproof heat insulation layer 405 can effectively prevent fire and insulate heat; at this time, the temperature of the front hatch cover 401 rises, the flame will quickly burn the fire extinguishing balloon 407 at the fire extinguishing hole 406, and then under the push of the high-pressure gas, the fire-retardant powder is sprayed out from the fire extinguishing hole 406, and finally the fire in front of the cabin door assembly 4 is extinguished by the fire-retardant powder.

[0048] As shown in the Figures 4 to 5 , Figures 9 to 10 As shown, five movable bolts are also installed between the front hatch cover 401 and the rear hatch cover 402, which are distributed on the top side of the rear hatch cover 402, the right side of the rear hatch cover 402 and the bottom side of the rear hatch cover 402, and each adjacent two movable bolts are synchronously driven by a connecting rod, and all the movable bolts can be assembled in the room door frame 2 under the transmission of the connecting rod, so as to strengthen the cabin door structure. Based on the traditional use of only the lock 403 to lock the cabin door, this scheme increases the movable bolts distributed at the top side, the right side and the bottom side of the cabin door, and all the movable bolts can be assembled in the room door frame 2 under the transmission of the connecting rod, so as to strengthen the cabin door structure, so that the closed cabin door has higher strength, and in this way, the cabin door has more fixed points, so that the cabin door is not easy to produce abnormal sound when the ship is sailing.

[0049] As shown in the Figure 10As shown, the movable pins include movable pin one 411 located in the middle of the right side of the rear hatch 402, movable pin two 412 located in the top of the right side of the rear hatch 402, movable pin three 413 located in the bottom of the right side of the rear hatch 402, movable pin four 414 located in the middle of the top side of the rear hatch 402, and movable pin five 415 located in the middle of the bottom side of the rear hatch 402, each of which is connected to a control socket rotatably mounted on the rear hatch 402. In order to increase the fixing points of the door assembly 4, five movable pins are installed on the top side, right side and bottom side of the door assembly 4; among them, there are three movable pins on the right side, and one movable pin on the top side and the bottom side, so as to improve the locking strength of the door assembly 4.

[0050] As shown in the figure, Figure 9 As shown, the control socket includes control socket one 416 fixedly connected with movable pin one 411, control socket two 417 fixedly connected with movable pin two 412, control socket three 418 fixedly connected with movable pin three 413, control socket four 419 fixedly connected with movable pin four 414, and control socket five 420 fixedly connected with movable pin five 415. In order to facilitate the control of the movement of the movable pins, the five movable pins are connected one by one to the control sockets, and the movement of the movable pins is realized by rotating the control sockets.

[0051] As shown in the figure, Figure 9 As shown, the connecting rod includes a driving connecting rod 421 that simultaneously rotatably connects control socket one 416, control socket two 417 and control socket three 418, a driven connecting rod one 422 that simultaneously rotatably connects control socket two 417 and control socket four 419, and a driven connecting rod two 423 that simultaneously rotatably connects control socket three 418 and control socket five 420; the surface of the movable pin is also sleeved with a rubber sleeve, which can improve the wear resistance of the movable pin, and the movable pin is not easy to move after being inserted. In order to facilitate the simultaneous movement of the five movable pins, by driving the driving connecting rod 421 to act, the five movable pins can be simultaneously inserted into the door frame 2 under the transmission of the two driven connecting rods.

[0052] As shown in the figure, Figures 9 to 10 As shown, the control socket one 416 is also connected to the pin rocker one 424 located in front of the front hatch 401 and the pin rocker two 425 located behind the rear hatch 402, and the pin rocker one 424 and the pin rocker two 425 are concentrically connected. In order to facilitate the driving of the driving connecting rod 421 to act, the control socket one 416 can be rotated by rotating the pin rocker one 424 at the front hatch 401, thereby driving the driving connecting rod 421 to move, and the five movable pins can be simultaneously inserted into the door frame 2; the control socket one 416 can be rotated by rotating the pin rocker two 425 at the rear hatch 402, thereby driving the driving connecting rod 421 to move, and the five movable pins can be simultaneously inserted into the door frame 2.

[0053] As shown in Figures 1 to 3 The door frame 2 protrudes from the front and rear sides of the cabin 1 as a whole, and can completely seal and wrap the top side, bottom side, left side and right side of the cabin door assembly 4. In order to ensure that the cabin door assembly 4 has good water tightness, the four sides of the cabin door assembly 4 are completely sealed and wrapped by the door frame 2 as a whole, and the entire cabin door assembly 4 is thick, which can effectively ensure that it has good water tightness.

[0054] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fire-extinguishing type watertight compartment door for ship cabins, comprising a door frame fixed to the hull and a door assembly mounted on the door frame on the left side via multiple hinges; The hatch assembly includes a front hatch located on the front side, a rear hatch detachably installed behind the front hatch, a lock fixedly installed between the front hatch and the rear hatch, and a fireproof glass for visibility installed on the rear hatch. Its features are: A fireproof and heat-insulating layer that fits the front hatch is also installed between the front hatch and the rear hatch. Multiple fire extinguishing holes are provided on the front hatch and the fireproof and heat-insulating layer, distributed at their top, middle and bottom. Each fire extinguishing hole is equipped with a fire extinguishing balloon filled with flame-retardant material located between the front hatch and the rear hatch. When the fire extinguishing balloon is burned out from the fire extinguishing hole, the flame-retardant material is sprayed out from the fire extinguishing hole to extinguish the fire. Multiple movable pins are also installed between the front hatch and the rear hatch, distributed simultaneously on the top side, right side and bottom side of the rear hatch. Each movable pin is also fitted with a rubber sleeve. Each pair of adjacent movable pins are synchronously driven by a connecting rod. All movable pins can be simultaneously assembled onto the door frame under the drive of the connecting rod, thereby strengthening the door structure. The movable pins include movable pin one located in the middle of the right side of the rear hatch, movable pin two located at the top of the right side of the rear hatch, movable pin three located at the bottom of the right side of the rear hatch, movable pin four located in the middle of the top side of the rear hatch, and movable pin five located in the middle of the bottom side of the rear hatch. Each movable pin is connected to a control socket that is rotatably mounted on the rear hatch. The control socket includes a control socket one fixedly connected to a movable pin one, a control socket two fixedly connected to a movable pin two, a control socket three fixedly connected to a movable pin three, a control socket four fixedly connected to a movable pin four, and a control socket five fixedly connected to a movable pin five.

2. The fire-extinguishing watertight compartment door for ship cabins according to claim 1, characterized in that: The fire extinguishing balloon is confined within a balloon cage, and a hollow screw sleeve is connected to the center of the balloon cage. Part of the fire extinguishing balloon extends into the hollow screw sleeve, and the entire fire extinguishing balloon and balloon cage are fixed to the fire extinguishing hole by the hollow screw sleeve.

3. The fire-extinguishing watertight compartment door for ship cabins according to claim 2, characterized in that: The flame-retardant material inside the fire-extinguishing balloon is composed of high-pressure gas and flame-retardant powder.

4. The fire-extinguishing watertight compartment door for ship cabins according to claim 1, characterized in that: The linkage includes an active linkage that simultaneously rotatably connects control socket one, control socket two, and control socket three; a driven linkage one that simultaneously rotatably connects control socket two and control socket four; and a driven linkage two that simultaneously rotatably connects control socket three and control socket five.

5. The fire-extinguishing watertight compartment door for ship cabins according to claim 4, characterized in that: The control socket is also connected to a first pin rocker arm located in front of the front hatch and a second pin rocker arm located behind the rear hatch, with the first pin rocker arm and the second pin rocker arm being concentrically connected.

6. The fire-extinguishing watertight compartment door for ship cabins according to claim 3, characterized in that: The door frame protrudes from the front and rear sides of the cabin, and the door frame can completely seal and enclose the top, bottom, left and right sides of the door assembly.

7. A fire extinguishing method based on a watertight compartment door in a fire-extinguishing ship's cabin, characterized in that: This method employs a watertight door for fire prevention and extinguishing in the ship's cabin, as described in any one of claims 3-6. The fire prevention and extinguishing methods are as follows: When the fire just spreads to the front of the hatch assembly, the fireproof and heat-insulating layer installed between the front and rear hatches can effectively prevent fire and insulate against heat. At this time, the temperature of the front hatch rises, and the flames will quickly burn through the fire extinguishing balloon at the fire extinguishing hole. Then, under the propulsion of high-pressure gas, the flame retardant powder is sprayed out from the fire extinguishing hole, and finally the fire in front of the hatch assembly is extinguished by the flame retardant powder.

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