Cabin door sealing tape for preventing liquid leakage, sealing joint and fire extinguishing airplane

Abstract

The invention belongs to the technical field of aircraft design, and discloses a cabin door sealing tape capable of preventing liquid leakage, a sealing joint and a fire extinguishing air.The cabin door sealing tape comprises a C-shaped body, the cross section of the C-shaped body comprises a first edge, a second edge and a third edge which are sequentially connected, and the free end of the third edge inclines in the direction away from the first edge; a boss structure is arranged on the outer side face of the first edge. Three sealing boundary lines can be formed between the cabin door sealing belt and the discharge port cabin door and between the cabin door sealing belt and the discharge port door frame, so that the sealing effect is good, and meanwhile, the sealing extrusion force of the discharge port cabin door is relatively small. The problem of leakage loss caused by overload generated by the liquid fire extinguishing medium stored in the water tank along with flight maneuvering of the fire extinguishing aircraft within the flight envelope range of task execution can be effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft design, and in particular relates to a cabin door sealing strip, a sealing node and a fire-fighting aircraft for preventing liquid leakage. Background Art

[0002] Aviation emergency rescue firefighting aircraft need to load a large amount of liquid fire extinguishing medium, then seal it and transport it to the fire scene, and then sprinkle it to control the fire. If the hatch used to open and discharge the liquid fire extinguishing medium in the air is not well sealed, the efficiency of the firefighting task will be greatly reduced. Therefore, a sealing structure that can meet the requirements of the air switch of the discharge hatch and the storage of large amounts of liquid fire extinguishing medium should be designed at the discharge port of the water tank.

[0003] Conventional fuselage door sealing strip structures include inflatable tube sealing strips, hollow tube compression sealing strips, foot-type compression sealing strips, diaphragm compression sealing strips and coated filler compression sealing strip structures. This type of door is not allowed to be opened in the air. The sealing structure of the door mainly plays an airtight role in the fuselage cabin. Since the pressure index of the aircraft cabin is solved by the pressure relief valve setting system, the seal of this type of door allows for inconspicuous air leakage. This door sealing structure technology cannot achieve a large-load watertight function.

[0004] For special fuselage doors with aerial switches and watertight requirements, the more sealing boundaries the better the sealing effect. However, if the door is closed by rotating around a fixed axis, the door structure cannot evenly and synchronously squeeze the sealing belt. When closing, the door structure close to the rotating axis will first squeeze the sealing belt until the door is closed. Too many sealing boundaries will produce very high compression resistance to the door in this process. The door control equipment needs to provide a large torque to meet the door closing function. Long-term deformation of the sealing belt under high load will also aggravate the occurrence of aging. Therefore, the development, installation and maintenance costs of the sealing structure and control equipment will increase. If the door is designed to close flat, although the door can be evenly squeezed to achieve a sealing effect, the development and maintenance costs of the door movement mechanism will also increase.

[0005] The hatch sealing strip structure that prevents liquid leakage is different from the conventional fuselage airtight hatch sealing structure. The structure and installation should be as simple as possible during design, and the performance should meet the watertight requirements. Although the above solution is feasible, it greatly increases the design and use costs. Therefore, it is necessary to design a sealing strip structure that prevents liquid leakage for special fuselage hatches with aerial switches and watertight requirements. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a door sealing strip, a sealing node and a fire-fighting aircraft for preventing liquid leakage. The door sealing strip of the present invention has a simple and practical cross-section and can effectively solve the problem of leakage and loss caused by overload caused by flight maneuvers of the liquid fire-extinguishing medium stored in the water tank of the fire-fighting aircraft within the flight envelope of the mission.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A hatch sealing strip for preventing liquid leakage comprises a C-shaped body, the cross section of which comprises a first side, a second side and a third side connected in sequence, wherein the free end of the third side is inclined in a direction away from the first side, and a boss structure is provided on the outer side surface of the first side.

[0008] Preferably, the third side is in the shape of an obtuse triangle, wherein one adjacent side of the obtuse angle is connected to the second side, and the other adjacent side of the obtuse angle is inclined in a direction away from the first side.

[0009] Preferably, the cross-sectional shape of the boss structure is a rounded rectangle, and the connection between the boss structure and the first side is transitionally connected by an arc angle.

[0010] Preferably, the outer side surfaces of the first side and the second side are perpendicular.

[0011] The present invention further provides a hatch sealing node for preventing liquid leakage, comprising a discharge port door frame, a pressure plate, a discharge port hatch and a hatch sealing strip, wherein the hatch sealing strip adopts the hatch sealing strip for preventing liquid leakage as described above in the present invention, and an inner ring of the discharge port door frame facing the discharge port hatch is provided with an installation groove for embedding the hatch sealing strip, and the hatch sealing strip is arranged in the installation groove, wherein the first side and the second side are both in contact with the surface of the installation groove, and the discharge port door frame is provided with a groove structure at a position corresponding to the boss structure at the installation groove, and the pressure plate is L-shaped, and one side of the pressure plate extends into the inner cavity of the C-shaped body and clamps the first side with the installation groove, and the other side of the pressure plate is connected to the discharge port door frame; When the discharge hatch and the hatch sealing strip are squeezed and sealed, the hatch sealing strip undergoes elastic deformation. After the hatch sealing strip undergoes elastic deformation, a first sealing boundary line is formed between the boss structure and the groove structure, a second sealing boundary line is formed between the second side outer surface and the mounting groove surface, and a third sealing boundary line is formed between the discharge hatch surface and the third side outer surface.

[0012] Preferably, the third side protrudes from the edge of the end surface of the discharge port door frame facing the discharge port hatch.

[0013] Preferably, the cross-section of the installation groove is L-shaped, and the first side and the second side are respectively in close contact with two side surfaces of the installation groove.

[0014] Preferably, the surface of the groove structure fits the surface of the boss structure.

[0015] Preferably, the pressure plate and the discharge port door frame are detachably connected via bolts.

[0016] The present invention also provides a fire-fighting aircraft, including an aircraft cabin, a water tank is provided in the aircraft cabin, a discharge port door frame is provided on the aircraft cabin, the water tank outlet is connected to the upper end of the discharge port door frame, the bottom of the aircraft cabin is rotatably connected to a discharge port hatch at a position corresponding to the discharge port door frame, and the aircraft cabin is provided with a driving device for controlling the opening and closing of the discharge port hatch door, wherein the discharge port hatch door and the discharge port door frame are connected by a hatch sealing node for preventing liquid leakage as described above in the present invention.

[0017] The present invention has the following beneficial effects: The hatch sealing strip for preventing liquid leakage of the present invention adopts a C-shaped body, wherein the third side is the side in contact with the discharge hatch of the fire-fighting aircraft, and the free end thereof is inclined in a direction away from the first side, and the structure is a cantilevered structure. Therefore, when the discharge hatch is closed, the discharge hatch first contacts the free end of the third side. Since the third side is a cantilevered structure, the extrusion force required when the discharge hatch contacts the third side is small, so that the third side can be closely attached to the surface of the discharge hatch to form a sealing boundary line. With the continuous extrusion of the discharge hatch, the extrusion between the third side and the third side of the discharge hatch will be tighter, and Since the third side is a cantilever structure with a large deformation capacity, it is helpful for all parts of the third side to fully contact with the discharge port hatch, thereby achieving good sealing. In addition, since the free end of the third side is inclined in the direction away from the first side, when the discharge port hatch is closed, the third side is inclined toward the inner side of the discharge port door frame. When there is fire extinguishing agent in the water tank, the gravity of the fire extinguishing agent will act on the surface of the third side facing the water tank, thereby further pressing the third side and the discharge port door frame together through the gravity of the fire extinguishing agent. In other words, the more fire extinguishing agent is in the water tank, the better the sealing effect between the third side and the discharge port door frame. Moreover, when the discharge port hatch door squeezes the third side, the third side will drive the second side and the first side to deform. First, due to the bending deformation of the third side, the second side will be subjected to a certain bending moment, which will cause the outer side surface of the second side to be more closely attached to the surface of the mounting groove on the discharge port door frame, thereby forming a sealing boundary between the second side and the surface of the mounting groove. After the third side squeezes the pressure, it will transmit pressure to the first side through the second side, thereby making the first side closely attached to the surface of the mounting groove. At the same time, the bending moment borne by the second side will also act on the first side, so that the first side will also be subjected to bending moment. Therefore, under the action of bending moment and pressure, the first side makes the boss structure and the groove structure on the mounting groove further closely attached, thereby forming another sealing boundary. Therefore, the hatch sealing strip for preventing liquid leakage of the present invention can form three effective sealing boundaries with the contact surface when in use, so the sealing effect is better, and the third side is a cantilever structure. Therefore, when sealing, under the same squeezing force, the hatch sealing strip for preventing liquid leakage of the present invention has a better sealing effect. In summary, the hatch sealing strip of the present invention has a simple and practical cross-section, and can effectively solve the problem of leakage and loss of liquid fire extinguishing medium stored in the water tank due to overload caused by flight maneuvers within the flight envelope of the fire-fighting aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present application is further described in detail below in conjunction with the accompanying drawings of the embodiments.

[0019] Figure 1 Schematic diagram of the water tank discharge port area of ​​the fire-fighting aircraft in an embodiment of the present invention.

[0020] Figure 2It is a structural schematic diagram of the installation position of the discharge port door frame and the discharge port hatch door of the fire-fighting aircraft in an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of the structure of the hatch door sealing strip and the discharge port door frame after being assembled in an embodiment of the present invention (the discharge port hatch is not shown).

[0022] Figure 4 It is a schematic diagram of the use state of the hatch sealing strip and the discharge port door frame after being assembled in an embodiment of the present invention (the discharge port hatch is closed).

[0023] Figure 5 Schematic diagram of the cross section of the hatch door sealing strip in the embodiment of the present invention.

[0024] Explanation of numbers in the figure: 1. hatch door sealing strip; 1-1. C-shaped body; 1-1-1. first side; 1-1-2. second side; 1-1-3. third side; 1-1-4. inner cavity; 2. pressure plate; 3. discharge port door frame; 3-1. mounting groove; 4. boss structure; 7. groove structure; 8. supporting structure; 9. first sealing boundary line; 10. second sealing boundary line; 11. third sealing boundary line; 12. discharge port hatch; 13. water tank; 14. aircraft cabin; 15. aircraft shape; 16. discharge port; 17. aircraft shell. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] like Figure 5 As shown, the hatch sealing strip for preventing liquid leakage in this embodiment includes a C-shaped body 1-1, and the cross section of the C-shaped body 1-1 includes a first side 1-1-1, a second side 1-1-2 and a third side 1-1-3 connected in sequence, wherein the free end of the third side 1-1-3 is inclined in a direction away from the first side 1-1-1, and a boss structure 4 is provided on the outer side of the first side 1-1-1. Figure 5Taking the shown orientation as an example, the surface of the C-shaped body 1-1 located on one side of the inner cavity 1-1-4 is called the inner side surface, and the upper surface of the first side 1-1-1, the left side surface of the second side 1-1-2 and the lower side surface of the third side 1-1-3 are called the outer side surfaces of the corresponding sides.

[0027] As a preferred embodiment of the present invention, Figure 5 As shown, in this embodiment, the shape of the third side 1-1-3 is an obtuse triangle, wherein one adjacent side of the obtuse angle is connected to the second side 1-1-2, and the other adjacent side of the obtuse angle is inclined in a direction away from the first side 1-1-1. Of course, the shape of the third side 1-1-3 can also adopt other structures with gradual thickness change, wherein the thickness of the free end of the third side 1-1-3 is smaller, and the thickness of the side close to the second side 1-1-2 is larger, which is conducive to the deformation of the third side 1-1-3, and further facilitates the sealing between the third side 1-1-3 and the surface of the discharge hatch.

[0028] As a preferred embodiment of the present invention, Figure 5 As shown, in this embodiment, the cross-section of the boss structure 4 is a rounded rectangle, and the connection between the boss structure 4 and the first side 1-1-1 is connected by an arc angle transition. The above structural design of the boss structure 4 is conducive to avoiding stress concentration and damage at the corner of the boss structure 4, thereby avoiding sealing failure.

[0029] As a preferred embodiment of the present invention, Figure 5 As shown, in this embodiment, the outer side surfaces of the first side 1-1-1 and the second side 1-1-2 are perpendicular.

[0030] This embodiment provides a hatch sealing node to prevent liquid leakage, see Figure 2-Figure 4 , the hatch sealing node comprises a discharge port door frame 3, a pressure plate 2, a discharge port hatch 12 and a hatch sealing strip 1, wherein the hatch sealing strip 1 adopts the hatch sealing strip for preventing liquid leakage provided by any of the above embodiments of the present invention, and the inner circle of the discharge port door frame 3 facing the discharge port hatch 12 is provided with a mounting groove 3-1 for embedding the hatch sealing strip 1, and the hatch sealing strip 1 is arranged in the mounting groove 3-1, wherein the first side 1-1-1 and the second side 1-1-2 are both in contact with the surface of the mounting groove 3-1, and the discharge port door frame 3 is provided with a groove structure 7 at a position corresponding to the boss structure 4 at the mounting groove 3-1, and the pressure plate 2 is L-shaped, and one side of the pressure plate 2 extends into the inner cavity of the C-shaped body 1-1 and clamps the first side 1-1-1 with the mounting groove 3-1, and the other side of the pressure plate 2 is connected to the discharge port door frame 3; see Figure 4After the discharge hatch 12 and the hatch sealing strip 1 are squeezed and sealed, the hatch sealing strip 1 undergoes elastic deformation. After the hatch sealing strip 1 undergoes elastic deformation, a first sealing boundary line 9 is formed between the boss structure 4 and the groove structure 7, a second sealing boundary line 10 is formed between the outer surface of the second side 1-1-2 and the surface of the installation groove 3-1, and a third sealing boundary line 11 is formed between the surface of the discharge hatch 12 and the outer side surface of the third side 1-1-3. Figure 4 It can be seen that the gravity of the fire extinguishing agent in the water tank can act on the inner side of the third side 1-1-3, so that the fire extinguishing agent in the water tank causes the outer side of the third side 1-1-3 to be pressed tighter against the surface of the discharge hatch 12.

[0031] As a preferred embodiment of the present invention, Figure 3 and Figure 4 As shown, in this embodiment, the third side 1-1-3 protrudes from the edge of the end face of the discharge port door frame 3 facing the discharge port hatch 12, so that the deformation ability of the third side 1-1-3 is better, and it helps the third side 1-1-3 to apply a certain bending moment to the second side after bending, which helps the second side to bend and deform, and then the second side is tightly attached to the surface of the installation groove 3-1.

[0032] As a preferred embodiment of the present invention, Figure 3 and Figure 4 As shown, in this embodiment, the cross-section of the mounting groove 3-1 is L-shaped, and the first side 1-1-1 and the second side 1-1-2 are respectively tightly attached to the two side surfaces of the mounting groove 3-1. At this time, the C-shaped body 1-1 preferably adopts a form in which the outer side surfaces of the first side 1-1-1 and the second side 1-1-2 are perpendicular, so as to ensure that the first sealing boundary line 9 and the second sealing boundary line 10 have a better sealing effect.

[0033] As a preferred embodiment of the present invention, Figure 3 and Figure 4 As shown, in this embodiment, the surface of the groove structure 7 is in contact with the surface of the boss structure 4. When the cross-sectional shape of the boss structure 4 is a rounded rectangle, the shape of the groove structure 7 can also be a rounded rectangle or a rectangle.

[0034] As a preferred embodiment of the present invention, Figure 3 and Figure 4 As shown, in this embodiment, the pressing plate 2 is detachably connected to the discharge port door frame 3 by bolts, which helps to quickly disassemble and assemble the pressing plate 2, thereby facilitating the rapid replacement of the hatch door sealing strip 1.

[0035] See also Figure 1 , combined with Figure 2-Figure 4The present embodiment provides a fire-fighting aircraft, including an aircraft cabin 14, a water tank 13 is provided in the aircraft cabin 14, a discharge port door frame 3 is provided on the aircraft cabin 14, an outlet of the water tank 13 is connected to an upper end of the discharge port door frame 3, a discharge port hatch 12 is rotatably connected to the bottom of the aircraft cabin 14 at a position corresponding to the discharge port door frame 3, and a driving device for controlling the opening and closing of the discharge port hatch 12 is provided on the aircraft cabin 14, wherein the discharge port hatch 12 is connected to the discharge port door frame 3 through a hatch sealing node for preventing liquid leakage as described in any of the above embodiments of the present invention.

[0036] Example See also Figure 1-Figure 5 This embodiment is a discharge hatch sealing strip structure designed with a certain type of firefighting aircraft as the carrier. Figure 1 As shown, the door sealing strip 1 is circumferentially arranged in the area of ​​the water tank discharge port door frame 3 on the belly of the aircraft.

[0037] See also Figure 5 The hatch sealing strip 1 of this embodiment has an irregular C-shaped cross section, comprising a first side 1-1-1, a second side 1-1-2 and a third side 1-1-3 connected in sequence, and a boss structure 4 is provided on the outer side of the first side 1-1-1. The hatch sealing strip 1 is clamped at the periphery of the discharge port door frame 3 by a detachable pressing plate 2, forming a bidirectional clamping structure of the hatch sealing strip 1, the boss structure 4 is pressed into the groove structure 7 of the discharge port door frame 3 to form a first sealing boundary line 9, the second side 1-1-2 is pressed on the supporting structure 8 of the discharge port door frame 3 (actually an inner wall of the upper mounting groove 3-1) to form a second sealing boundary line 10, and the third side 1-1-3 is squeezed and deformed when the discharge port hatch 12 is closed to form a third sealing boundary line 11.

[0038] In this embodiment, the first sealing boundary line 9 is realized by the boss structure 4 being pressed into the groove structure 7 of the discharge port door frame 3. The boss structure 4 is extruded and deformed in the groove structure 7 to fit with the supporting surfaces of the groove structure 7 in three directions. The clamping gap between the pressure plate 2 and the discharge port door frame 3 on one side of the sealing belt boss structure 4 only needs to be the same as the wall thickness of the hatch sealing belt 1 at that side. By designing the compression amount of the boss structure 4 and the groove structure 7, only a very small supporting force is required to complete the pre-positioning of the hatch sealing belt 1 and the pressure plate 2 when installing the hatch sealing belt 1.

[0039] The second sealing boundary line 10 is achieved by bending the second side 1-1-2 and squeezing it onto the supporting structure 8 of the discharge port door frame 3. The second side 1-1-2 is limited by the pressure plate 2 on the inner side of the second side 1-1-2, so that the second side 1-1-2 is in contact with the supporting structure 8 of the discharge port door frame 3. At the same time, the inner side of the second side 1-1-2 is also in contact with the end of the pressure plate 2. On the premise that the pressure plate 2 has been pre-positioned, the pressure plate 2 is pressed against the second side 1-1-2 by tightening the fasteners.

[0040] The third sealing boundary line 11 is realized by the extrusion deformation of the third side 1-1-3 when the discharge port hatch 12 is in the closed state. The space formed between the discharge port hatch 12 in the closed state and the discharge port door frame 3 is smaller than the height of the hatch sealing strip 1. The third side 1-1-3 is extruded and deformed when the discharge port hatch 12 is closed and fits the surface of the discharge port hatch 12.

[0041] This embodiment has a typical practical effect in preventing the leakage and loss of liquid fire extinguishing medium stored inside the aircraft due to overload during flight, and improving the efficiency of fire extinguishing operations.

[0042] It can be seen from the above scheme that the advantages of the present invention are: the hatch sealing strip structure for preventing liquid leakage of the present invention is a novel, unique and simple cross-sectional design. When the discharge hatch rotates around the fixed axis to close, the volume of the extruded sealing strip is small, and the third side of the triangle (or with a gradual thickness change) is designed to have a large space for its deformation, so the hatch sealing strip generates little resistance to the hatch, and the torque requirement for the control device is not high; after the discharge hatch is closed, the sealing strip boss structure, waist structure and angle structure design realize the watertight function, and the design of the gradual thickness of the third side section will make the sealing effect better when the liquid load increases, which can effectively solve the problem of leakage loss caused by the overload of the liquid fire extinguishing medium stored in the water tank caused by the flight maneuver.

[0043] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A hatch sealing tape for preventing liquid leakage, characterized in that: The invention comprises a C-shaped body (1-1), wherein the cross section of the C-shaped body (1-1) comprises a first side (1-1-1), a second side (1-1-2) and a third side (1-1-3) connected in sequence, wherein the free end of the third side (1-1-3) is inclined in a direction away from the first side (1-1-1), and a boss structure (4) is provided on the outer side surface of the first side (1-1-1).

2. A hatch sealing tape for preventing liquid leakage according to claim 1, characterized in that: The third side (1-1-3) is in the shape of an obtuse triangle, wherein one adjacent side of the obtuse angle is connected to the second side (1-1-2), and the other adjacent side of the obtuse angle is inclined in a direction away from the first side (1-1-1).

3. A hatch sealing tape for preventing liquid leakage according to claim 1, characterized in that: The cross-sectional shape of the boss structure (4) is a rounded rectangle, and the connection between the boss structure (4) and the first side (1-1-1) is connected via an arc angle transition.

4. A hatch sealing tape for preventing liquid leakage according to claim 1, characterized in that: The outer sides of the first side (1-1-1) and the second side (1-1-2) are perpendicular.

5. A hatch sealing node for preventing liquid leakage, characterized in that: The invention comprises a discharge port door frame (3), a pressure plate (2), a discharge port hatch (12) and a hatch sealing strip (1), wherein the hatch sealing strip (1) is a hatch sealing strip for preventing liquid leakage according to any one of claims 1 to 4, an inner ring of the discharge port door frame (3) facing the discharge port hatch (12) is provided with a mounting groove (3-1) for embedding the hatch sealing strip (1), and the hatch sealing strip (1) is arranged in the mounting groove (3-1), wherein the first side (1-1-1) and the second side (1-1-2) are both in contact with the surface of the mounting groove (3-1), the discharge port door frame (3) is provided with a groove structure (7) at a position corresponding to the boss structure (4) at the mounting groove (3-1), the pressure plate (2) is L-shaped, one side of the pressure plate (2) extends into the inner cavity of the C-shaped body (1-1) and clamps the first side (1-1-1) with the mounting groove (3-1), and the other side of the pressure plate (2) is connected to the discharge port door frame (3); When the discharge hatch door (12) and the hatch door sealing strip (1) are squeezed and sealed, the hatch door sealing strip (1) undergoes elastic deformation. After the hatch door sealing strip (1) undergoes elastic deformation, a first sealing boundary line (9) is formed between the boss structure (4) and the groove structure (7), a second sealing boundary line (10) is formed between the outer surface of the second edge (1-1-2) and the surface of the mounting groove (3-1), and a third sealing boundary line (11) is formed between the surface of the discharge hatch door (12) and the outer side surface of the third edge (1-1-3).

6. A hatch sealing node for preventing liquid leakage according to claim 5, characterized in that: The third side (1-1-3) protrudes from the edge of the end surface of the discharge port door frame (3) facing the discharge port hatch door (12).

7. A hatch door sealing node for preventing liquid leakage according to claim 5, characterized in that: The cross section of the installation groove (3-1) is L-shaped, and the first side (1-1-1) and the second side (1-1-2) are respectively in close contact with two side surfaces of the installation groove (3-1).

8. A hatch sealing node for preventing liquid leakage according to claim 5, characterized in that: The surface of the groove structure (7) fits the surface of the boss structure (4).

9. A hatch door sealing node for preventing liquid leakage according to claim 5, characterized in that: The pressure plate (2) and the discharge port door frame (3) are detachably connected via bolts.

10. A fire-fighting aircraft, characterized in that: The invention comprises an aircraft cabin (14), wherein a water tank (13) is arranged in the aircraft cabin (14), a discharge port door frame (3) is arranged on the aircraft cabin (14), an outlet of the water tank (13) is connected to the upper end of the discharge port door frame (3), a discharge port hatch (12) is rotatably connected to the bottom of the aircraft cabin (14) at a position corresponding to the discharge port door frame (3), and a driving device for controlling the opening and closing of the discharge port hatch door (12) is arranged on the aircraft cabin (14), wherein the discharge port hatch door (12) is connected to the discharge port door frame (3) via a hatch sealing node for preventing liquid leakage as claimed in any one of claims 5 to 9.

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