Fireproofing and sound reduction hatch and double door system

Abstract

The utility model relates to ship technology field, concretely relates to a ship noise reduction fire -resistant cabin door and double door system, ship noise reduction fire -resistant cabin door includes door frame and the door body embedded in door frame, and the one -sided wall of door body is fixedly connected with hinged axle, and the both ends of hinged axle respectively penetrate door frame top wall and bottom wall and rotate cooperation, and the inside hollow of door body is used to hold cooling water, and the end face of both ends of hinged axle all sets up the water delivery hole of the communication inside and outside two sides of door body, sets up the water stop portion for controlling water delivery hole on -off in water delivery hole, and water stop portion can make water delivery hole present closed state under normal temperature environment. The built -in ceramic fiber / fireproof plate of door body satisfies the fire resistance time limit requirement, and the material and installation of door body / door frame meet the legal inspection regulation of ship and offshore facility - the legal inspection technical regulation of inland ship, to solve the problem that the door body surface heat accumulation forms high temperature when the fire occurs in the prior art, makes the component damage failure in the door body, leads to cabin door to be unable to normally open or close, influences the problem of escape or rescue.

Description

Technical Field

[0001] This utility model relates to the field of marine technology, specifically to a cabin door and double-door system for ship noise reduction and fire prevention. Background Technology

[0002] Hatch doors are a crucial component in ensuring the safety and functional integrity of a ship's internal space. This is especially true for bottom-mounted equipment rooms (such as engine rooms and boiler rooms), where doors must not only provide standard waterproofing and sound insulation but also meet specific requirements for fire resistance and noise reduction. Currently, these hatch doors are mostly made of metal materials (such as steel and aluminum alloys). While metal materials offer high strength and fire resistance, significant technical challenges remain in their practical application.

[0003] For example, when a fire occurs in the ship's machinery room, the high thermal conductivity of metal will cause heat to be rapidly transferred to the door. The heat accumulates on the door surface, forming a high temperature. Key components such as door locks, hinges, and door closers may become stuck or deformed due to metal expansion, lubrication failure, or material softening under high temperatures, making it impossible for the hatch to open or close normally, thus affecting escape or rescue. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a ship noise reduction and fireproof hatch and a double-door system to solve the problem in the prior art where heat accumulates on the surface of the door during a fire, causing high temperatures and damage to the internal components of the door, resulting in the hatch being unable to open or close normally, thus affecting escape or rescue.

[0005] This utility model is achieved through the following technical solution:

[0006] A ship noise reduction and fireproof hatch includes a door frame and a door body embedded in the door frame. A hinge shaft is fixedly connected to one side wall of the door body. The two ends of the hinge shaft pass through the top wall and bottom wall of the door frame respectively and are rotatably engaged. The interior of the door body is hollow to hold cooling water. Water supply holes connecting the inside and outside of the door body are opened on the end faces of both ends of the hinge shaft.

[0007] The water inlet is equipped with a water-stopping part for controlling the opening and closing of the water inlet. The water-stopping part can keep the water inlet closed under normal temperature conditions and can keep the water inlet open after being heated.

[0008] Furthermore, the top and bottom surfaces of the door frame are provided with two through holes that are opposite to the two ends of the hinge shaft. The two ends of the hinge shaft are respectively inserted into the two through holes for rotation and sealing fit.

[0009] Two connecting pipes are provided outside the door frame, each corresponding to one of the two through holes. One end of the connecting pipe is inserted into the end of the corresponding through hole facing away from the hinge shaft and is fixedly connected.

[0010] Furthermore, both of the water inlets are connected to a water pipe at one end of the door body, and the water pipe corresponding to the upper water inlet extends upward to the top of the door body at the end opposite to the water inlet.

[0011] The lower water inlet corresponds to a water pipe that extends downwards from the end opposite to the water inlet to the bottom of the door body.

[0012] Furthermore, the lower water pipe is embedded in the middle of the side wall of the door and bypasses the door lock.

[0013] Furthermore, a water supply pipe is provided inside the door body, and both ends of the water supply pipe are connected to the water supply holes at both ends of the hinge shaft.

[0014] The water pipe has a serpentine, meandering structure in the middle and is evenly laid in the hollow cavity of the door. The outer surface of the water pipe is in contact with the two sides of the door along the thickness direction.

[0015] Furthermore, a groove for storing a water pipe is provided on one side of the door along the thickness direction. The water pipe is detachably and fixedly connected to the water inlet. A cover plate for covering the opening of the groove is detachably connected to the door.

[0016] Furthermore, a receiving cavity extending in the direction of the door thickness is provided on the inner side wall of the middle part of the water inlet, and the middle part of the receiving cavity is connected to the middle part of the water inlet;

[0017] The water-stopping part includes a piston embedded in the receiving cavity, springs disposed at both ends of the piston, and a heat-absorbing expansion medium. The piston slides and seals against the inner side wall of the receiving cavity, and the diameter of the water delivery hole is smaller than the outer dimensions of the piston.

[0018] The piston sidewall is provided with a connecting hole that passes through the piston. The two openings in the middle of the water supply hole that are connected to the receiving cavity are located on the movement trajectory of the openings at both ends of the connecting hole, and the openings at both ends of the connecting hole can be connected to the two openings in the middle of the water supply hole at the same time.

[0019] One end of the spring is fixedly connected to the piston, and the other end is fixedly connected to one end wall of the receiving cavity. When the spring is in its naturally extended state, the connection hole is covered and blocked by the side wall of the receiving cavity where a heat-absorbing expansion medium is provided.

[0020] Furthermore, the storage cavity is open at one end with a heat-absorbing and expanding medium, and a cover for covering and sealing the opening of the storage cavity is provided outside the storage cavity, and is fixedly connected in a detachable manner.

[0021] Furthermore, the piston is provided with a marking rod at one end where a spring is located. One end of the marking rod is fixedly connected to the piston, and the other end extends in the direction away from the piston, penetrating the wall of the storage cavity and extending out of the door body.

[0022] A dual-door system for ships includes the aforementioned hatches and a passageway for pedestrians to pass through. The passageway has hatches at both its inlet and outlet, and both hatches rotate outwards to open.

[0023] The beneficial effects of this utility model are as follows:

[0024] The ship's noise reduction and fireproof hatch and double-door system utilizes cooling water inside the door to absorb heat from the door surface. Water inlets at both ends of the hinge shaft provide pipes for the cooling water to enter and exit the door from both the inside and outside. The cooling water flows into or out of the door, carrying away heat and achieving a cooling effect, thus protecting the door and its internal components. Simultaneously, a water-stop mechanism controls the flow of cooling water through the water inlets. When heated, the water-stop mechanism opens the inlets, automatically connecting the pipes to facilitate the flow of cooling water for heat absorption or transport, keeping the door at a lower temperature for a short period to aid in escape or rescue.

[0025] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model;

[0027] Figure 2 This is a three-dimensional structural diagram of the hatch in Embodiment 1 of this utility model;

[0028] Figure 3 This is a front view of the hatch in Embodiment 1 of this utility model;

[0029] Figure 4 This is a top view of the hatch in Embodiment 1 of this utility model;

[0030] Figure 5 Bit Figure 3 Sectional view of AA;

[0031] Figure 6 Bit Figure 4 Sectional view of BB;

[0032] Figure 7 Bit Figure 5 Enlarged view of point C in the middle;

[0033] Figure 8 This is a three-dimensional structural diagram of the door in Embodiment 2 of this utility model.

[0034] In the diagram: 1. Door frame; 11. Through hole; 12. Connecting pipe; 2. Door body; 21. Hinge shaft; 22. Water inlet hole; 23. Water pipe; 24. Groove; 25. Cover plate; 26. Storage cavity; 31. Piston; 311. Connecting hole; 312. Marking rod; 32. Spring; 33. Heat-absorbing expansion medium; 34. Cover; 4. Channel. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0040] Example 1

[0041] Please see Figure 1-7This utility model provides a technical solution: a ship noise reduction and fireproof hatch, including a door frame 1 and a door body 2 embedded in the door frame 1. A hinge shaft 21 is fixedly connected to one side wall of the door body 2. The two ends of the hinge shaft 21 pass through the top wall and bottom wall of the door frame 1 respectively and are rotatably engaged. The interior of the door body 2 is hollow to hold cooling water. Water supply holes 22 connecting the inside and outside of the door body 2 are opened on the end faces of both ends of the hinge shaft 21.

[0042] The water inlet 22 is provided with a water-stopping part for controlling the opening and closing of the water inlet 22. The water-stopping part can keep the water inlet 22 closed under normal temperature conditions and can keep the water inlet 22 open after being heated.

[0043] In this design, cooling water is placed inside the door body 2 to absorb heat from its surface. Water inlets 22 at both ends of the hinge shaft 21 provide channels for the cooling water to enter and exit the door body 2. The cooling water flows into or out of the door body 2 through these channels, carrying away heat and achieving a cooling effect, thus protecting the door body 2 and its internal components. Simultaneously, a water-stop mechanism controls the flow of cooling water through the water inlets 22. When heated, the water-stop mechanism opens the water inlets 22, automatically connecting the channels and facilitating the flow of cooling water for heat absorption or transport. This keeps the door body 2 at a lower temperature for a short period, aiding in escape or rescue.

[0044] When the hatch is installed on the bottom of the ship to protect the equipment room, the water inlet 22 at the lower end of the hinge shaft 21 can be used as a water inlet, and the water inlet can be extended into the river water or seawater below the ship to form a channel 4 for river water or seawater to enter the interior of the door body 2; the water inlet 22 at the upper end can be used as a water outlet, and the water outlet can be connected to the ship's circulating water pipe (such as the water intake pipe in the open cooling water system). The water pump in the ship's water circulation system can be used to draw river water or seawater into the door body 2 and into the circulating water pipe. When the water inlet 22 is open, the water flow can continuously remove the heat on the door body 2 to assist in escape or rescue.

[0045] In this embodiment: the top and bottom surfaces of the door frame 1 are provided with two through holes 11 that are opposite to the two ends of the hinge shaft 21. The two ends of the hinge shaft 21 are respectively inserted into the two through holes 11 for rotation and sealing fit.

[0046] The door frame 1 is provided with two connecting pipes 12 that correspond one-to-one with the two through holes 11. One end of the connecting pipe 12 is inserted into the end of the corresponding through hole 11 facing away from the hinge shaft 21 and is fixedly connected.

[0047] In this plan, such as Figure 6As shown, the hinge shaft 21 is inserted into the through hole 11 and sealed. A connecting pipe 12 (for insertion underwater or connection to a circulating water pipe) is provided at the end of the through hole 11 facing away from the hinge shaft 21. This keeps the water inlet 22 connected to the through hole 11 and the inside of the connecting pipe 12. The hinge shaft 21 can rotate normally relative to the connecting pipe 12 to perform the door opening and closing operation, reducing the probability of damage to the connecting pipe 12 due to the rotation and twisting of the door body 2. Therefore, the connecting pipe 12 can be fixedly installed on the hull with clamps or other equipment to protect the connecting pipe 12.

[0048] One end of the connecting pipe 12 corresponding to the water inlet is inserted into the water at the bottom of the ship, and a filter screen is installed at the pipe opening to prevent aquatic organisms, garbage, etc. from entering.

[0049] In this embodiment: both water inlets 22 are connected to water pipes 23 at one end inside the door body 2, and the upper water inlet 22 corresponds to the water pipe 23 extending upward to the top of the door body 2 at the end opposite to the water inlet 22;

[0050] The lower water inlet 22 corresponds to the water pipe 23 extending downwards to the bottom of the door body 2 at the end opposite to the water inlet 22.

[0051] In this plan, such as Figure 6 As shown, the water supply pipe 23 can be fixed to the inside of the door body 2 by means of clamps or other methods. One end of the water supply pipe 23 corresponding to the water inlet extends to the bottom of the inside of the door body 2, so that water can be stored at the bottom of the door body 2; the other end of the water supply pipe 23 corresponding to the water outlet extends to the top of the inside of the door body 2, so that the inside of the door body 2 can be filled with water before it can be discharged from the water outlet, so that the water can fully contact the inner wall of the door body 2 to absorb heat and promote heat transport.

[0052] In this embodiment: the lower water pipe 23 is embedded in the side wall of the door body 2 and bypasses the door lock.

[0053] In this design, the water supply pipe 23 is sealed to the side wall of the door body 2, which prevents cooling water inside the door body 2 from entering the vicinity of the door lock and corroding and damaging it. The water supply pipe 23 is made of a heat-conducting material (such as copper), and a section of the middle part of the water supply pipe 23 is wrapped around the door lock. Some of the heat around the door lock is conducted to the cooling water inside the water supply pipe 23, and the heat is carried away with the flow of the cooling water, thus protecting the door lock.

[0054] In this embodiment: a receiving cavity 26 extending in the thickness direction of the door body 2 is provided on the inner side wall of the middle part of the water inlet 22, and the middle part of the receiving cavity 26 is connected to the middle part of the water inlet 22;

[0055] The water-stopping part includes a piston 31 embedded in the receiving cavity 26, springs 32 disposed at both ends of the piston 31, and a heat-absorbing expansion medium 33. The piston 31 slides and seals against the inner wall of the receiving cavity 26, and the diameter of the water delivery hole 22 is smaller than the outer dimensions of the piston 31.

[0056] The piston 31 has a connecting hole 311 through the piston 31 on its side wall. The two openings in the middle of the water supply hole 22 that are connected to the receiving cavity 26 are located on the movement trajectory of the openings at both ends of the connecting hole 311, and the openings at both ends of the connecting hole 311 can be connected to the two openings in the middle of the water supply hole 22 at the same time.

[0057] One end of the spring 32 is fixedly connected to the piston 31, and the other end is fixedly connected to one end wall of the receiving cavity 26. When the spring 32 is in its naturally extended state, the connecting hole 311 is covered and blocked by the side wall of the receiving cavity 26 where the heat-absorbing expansion medium 33 is provided.

[0058] In this design, piston 31 is positioned in the middle of the receiving cavity 26, dividing the receiving cavity 26 into two chambers. The two chambers respectively contain spring 32 and heat-absorbing expansion medium 33. Spring 32 provides elastic support for piston 31. At room temperature, spring 32 extends freely, causing piston 31 to move towards heat-absorbing expansion medium 33 and come into contact with it. The connecting hole 311 is blocked by the side wall of the receiving cavity 26 containing heat-absorbing expansion medium 33, achieving a normally closed state for water supply hole 22 at room temperature. This reduces the impact of continuous cooling water flow on the sealing performance of water supply pipe 23 on the hatch.

[0059] Among them, the heat-absorbing expansion medium 33 can be selected as a paraffin-based phase change material (such as n-octadecane (C 18 H 38 ), n-eicosane (C 20 H 42 ), n-dodecane (C 22 H 46 The heat-absorbing and expanding medium 33 undergoes a solid-liquid phase transition at 50-70℃, with a volume expansion rate ≥10%. As the heat-absorbing and expanding medium 33 continuously absorbs heat and rises in temperature, its volume continuously increases, pushing the piston 31 to slide. The spring 32 is compressed and contracts, bringing the connecting hole 311 closer to the water inlet 22, until the spring 32 is compressed to its limit position, at which point the connecting hole 311 is just opposite to the opening in the middle of the water inlet 22. That is, in the event of a fire, the temperature of the door 2 continuously rises, and the heat-absorbing and expanding medium 33 automatically opens the water inlet 22, allowing cooling water to flow normally inside and outside the door 2 to transport heat.

[0060] In addition, the piston 31 is prismatic in shape, and the receiving cavity 26 is adapted to the shape of the piston 31, so that the piston 31 can only slide along the length of the receiving cavity 26.

[0061] In this embodiment: the storage cavity 26 is provided with a heat-absorbing expansion medium 33 at one end, and a cover 34 is provided outside the storage cavity 26 to cover and block the opening of the storage cavity 26, and is fixedly connected by a detachable type.

[0062] In this design, an annular protrusion is provided on the outer surface of the door body 2 at the opening of the storage cavity 26. The outer circular surface of the annular protrusion is provided with external threads. One end of the cover 34 has a hollow structure. The open end of the cover 34 is fitted over the annular protrusion and connected by threaded engagement. A sealing ring can be provided inside the cover 34. The sealing purpose is achieved by tightening the cover 34 to compress the sealing ring, thus preventing the heat-absorbing expansion medium 33 from overflowing and being lost.

[0063] Furthermore, by detachably connecting the cover 34 to the annular protrusion, the cover 34 can be opened to fill and replace the heat-absorbing expansion medium 33, or to inspect and replace the piston 31 and spring 32.

[0064] In this embodiment: The piston 31 is provided with a marking rod 312 at one end of the spring 32. One end of the marking rod 312 is fixedly connected to the piston 31, and the other end extends in the direction away from the piston 31 and passes through the storage cavity 26 and extends out of the door body 2 at the end wall away from the opening.

[0065] In this design, when the spring 32 is in its naturally extended state, the end of the marker rod 312 facing away from the piston 31 is flush with the outer surface of the door body 2. When the spring 32 is compressed and contracted, the marker rod 312 is pushed outward from the outer surface of the door body 2, so as to facilitate observation and understanding of the connection status of the water inlet 22. Furthermore, the relative position of the connecting hole 311 and the water inlet 22 can be calculated and analyzed by measuring the length of the protruding section of the marker rod 312.

[0066] A double-door system for ships includes the aforementioned hatches and a passageway 4 for pedestrians to pass through. The passageway 4 has hatches at both its inlet and outlet, and both hatches have door bodies 2 that rotate outward from the passageway 4.

[0067] In this design, passage 4 is a hollow structure with openings at both ends. Two hatches cover and seal the openings at both ends of passage 4. With both hatches closed, passage 4 is relatively enclosed, forming a fire-resistant and noise-reducing isolation zone. Simultaneously, the inner walls of passage 4 are covered with fire-retardant calcium silicate boards or intumescent fire-retardant coatings, forming a continuous fire barrier to prevent the spread of flames and high-temperature smoke.

[0068] The door frame 1 is fixedly installed at the entrance of passage 4. Fire-resistant sealing strips (such as graphite-based expanding sealing strips) are installed around the door frame 1. These strips expand after absorbing heat, filling the gaps in the door, blocking oxygen supply, increasing the internal sealing of passage 4, limiting the spread of fire, and improving fire resistance. Water mist nozzles can also be installed inside passage 4. After a fire breaks out, the nozzles spray fine water droplets into passage 4 to form a water curtain isolation zone, further suppressing the fire.

[0069] In addition, the inner wall of channel 4 adopts a "mass-spring-mass" structure: the outer layer is a damping steel plate, the middle layer is a sound insulation felt (such as EPDM rubber) plus a honeycomb aluminum sound-absorbing layer, and the inner layer is a perforated sound-absorbing panel, which can reduce noise by more than 30dB (compliant with IMO MSC.337(91) standard).

[0070] The door body 2 is filled with sound-insulating foam (such as polyurethane foam) or an acoustic honeycomb structure to block the noise transmission path. The edges of the door body 2 are equipped with magnetic sealing strips or pneumatic sealing devices, which fit tightly against the door frame 1 when closed, reducing airborne sound transmission and further reducing noise.

[0071] Furthermore, both doors 2 rotate outwards from the passageway 4, which avoids the problem of interference between the two doors 2 when both doors are opened simultaneously.

[0072] Therefore, the dual-door system can effectively block cabin noise and potential fire sources, improving crew comfort and safety.

[0073] Example 2

[0074] Please see Figure 8 The difference from Embodiment 1 is that: a water supply pipe 23 is provided inside the door body 2, and the two ends of the water supply pipe 23 are respectively connected to the water supply holes 22 at both ends of the hinge shaft 21;

[0075] The water pipe 23 has a serpentine structure in the middle and is evenly laid in the hollow cavity of the door body 2. The outer surface of the water pipe 23 is in contact with the two sides of the door body 2 along the thickness direction.

[0076] In this design, the water pipe 23 is made of a thermally conductive material (such as copper). The outer surface of the water pipe 23 is tightly fitted to the inner wall of the door body 2, which effectively transfers heat from the surface of the door body 2 to the water pipe 23, where it is then carried away by cooling water. The water pipe 23 fills the interior space of the door body 2, and its two ends are connected to two water inlets 22, ensuring that cooling water entering the door body 2 can only flow along the water pipe 23 and out, effectively reducing the phenomenon of hot water stagnation inside the door body 2 and promoting heat transport.

[0077] In this embodiment: a groove 24 for storing a water pipe 23 is provided on one side of the door body 2 along the thickness direction. The water pipe 23 is detachably fixedly connected to the water inlet 22. A cover plate 25 for covering the opening of the groove 24 is detachably connected to the door body 2.

[0078] In this solution, the cover plate 25 is fixed to the door body 2 by bolts, so that the cover plate 25 can be removed from the door body 2. The two ends of the water supply pipe 23 are respectively inserted into the two water supply holes 22 and tightly connected, so that the water supply pipe 23 can be removed for cleaning and replacement.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A shipboard noise reduction and fireproof hatch, comprising a door frame (1) and a door body (2) embedded in the door frame (1), wherein a hinge shaft (21) is fixedly connected to one side wall of the door body (2), and the two ends of the hinge shaft (21) respectively penetrate the top wall and bottom wall of the door frame (1) and are rotatably engaged, characterized in that: The door body (2) is hollow inside to hold cooling water, and the end faces of both ends of the hinge shaft (21) are provided with water supply holes (22) that connect the inside and outside of the door body (2). The water inlet (22) is provided with a water-stopping part for controlling the opening and closing of the water inlet (22). The water-stopping part can keep the water inlet (22) closed under normal temperature conditions and can keep the water inlet (22) open after being heated.

2. The ship noise reduction and fireproof hatch according to claim 1, characterized in that: The top and bottom surfaces of the door frame (1) are provided with two through holes (11) that are opposite to the two ends of the hinge shaft (21). The two ends of the hinge shaft (21) are respectively inserted into the two through holes (11) for rotation and sealing fit. The door frame (1) is provided with two connecting pipes (12) that correspond one-to-one with the two through holes (11). One end of the connecting pipe (12) is inserted into the end of the corresponding through hole (11) facing away from the hinge shaft (21) and fixedly connected.

3. The ship noise reduction and fireproof hatch according to claim 1, characterized in that: Both water inlets (22) are connected to water pipes (23) at one end inside the door body (2). The upper water inlet (22) is connected to the water pipe (23) at the end opposite to the water inlet (22) and extends upward to the top inside the door body (2). The lower water inlet (22) corresponds to the water pipe (23) extending downwards from the end opposite to the water inlet (22) to the bottom of the door body (2).

4. The ship noise reduction and fireproof hatch according to claim 3, characterized in that: The lower water pipe (23) is embedded in the middle of the side wall of the door (2) and bypasses the door lock.

5. The ship noise reduction and fireproof hatch according to claim 1, characterized in that: The door body (2) is equipped with a water supply pipe (23), and the two ends of the water supply pipe (23) are respectively connected to the water supply holes (22) at both ends of the hinge shaft (21); The middle part of the water supply pipe (23) has a serpentine meandering structure and is evenly laid in the hollow cavity of the door body (2). The outer surface of the water supply pipe (23) is in contact with the two sides of the door body (2) along the thickness direction.

6. The ship noise reduction and fireproof hatch according to claim 5, characterized in that: The door body (2) has a groove (24) for storing a water pipe (23) on one side along the thickness direction. The water pipe (23) is detachably fixed to the water inlet (22). A cover plate (25) for covering the opening of the groove (24) is detachably connected to the door body (2).

7. The ship noise reduction and fireproof hatch according to claim 1, characterized in that: The inner wall of the middle part of the water inlet (22) is provided with a storage cavity (26) extending in the thickness direction of the door body (2), and the middle part of the storage cavity (26) is connected to the middle part of the water inlet (22); The water-stopping part includes a piston (31) embedded in the receiving cavity (26), springs (32) set at both ends of the piston (31) and a heat-absorbing expansion medium (33). The piston (31) slides and seals against the inner wall of the receiving cavity (26), and the diameter of the water delivery hole (22) is smaller than the outer dimensions of the piston (31). The piston (31) has a connecting hole (311) that penetrates the piston (31) on its side wall. The two openings in the middle of the water supply hole (22) that are connected to the receiving cavity (26) are located on the movement trajectory of the openings at both ends of the connecting hole (311), and the openings at both ends of the connecting hole (311) can be connected to the two openings in the middle of the water supply hole (22) at the same time. One end of the spring (32) is fixedly connected to the piston (31), and the other end is fixedly connected to one end wall of the receiving cavity (26). When the spring (32) is in its naturally extended state, the connecting hole (311) is covered and sealed by the side wall of the receiving cavity (26) where the heat-absorbing expansion medium (33) is provided.

8. The ship noise reduction and fireproof hatch according to claim 7, characterized in that: The storage cavity (26) is provided with a heat-absorbing expansion medium (33) at one end, and a cover (34) is provided outside the storage cavity (26) to cover and block the opening of the storage cavity (26), and is fixedly connected by a detachable type.

9. The ship noise reduction and fireproof hatch according to claim 7, characterized in that: The piston (31) is provided with a spring (32) and a marker rod (312) is provided at one end. One end of the marker rod (312) is fixedly connected to the piston (31), and the other end extends in the direction away from the piston (31) and extends out of the door body (2) through the wall of the storage cavity (26) away from the opening.

10. A double-door system for ships, comprising a hatch as described in any one of claims 1-9 and a passageway (4) for pedestrian passage, characterized in that: Both the inlet and outlet of the passage (4) are equipped with hatches, and the door body (2) of both hatches rotates outward from the passage (4) to open.

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