Cabin door structure and fire extinguishing airplane

Abstract

A hatch door structure and a fire extinguishing aircraft, the hatch door structure comprising: a hatch door frame that constitutes a throwing port through which water in a water tank is thrown to the outside; the throwing cabin door is mounted on the cabin door frame in a manner of opening and closing the throwing opening; the sealing blocking piece is arranged on the inner periphery of the cabin door frame; the sealing piece is continuously arranged on the periphery of one of the throwing cabin door and the sealing blocking piece and abuts against the other one of the throwing cabin door and the sealing blocking piece to seal the throwing opening when the throwing cabin door is closed, and the sealing blocking piece is provided with a rectification face facing the center of the throwing opening; and the rectifying surface is used for guiding the flow of water to the outside when the throwing cabin door is opened. Therefore, the watertight requirement of the throwing opening of the fire-extinguishing aircraft water tank and the requirement for rapidly discharging the fire-extinguishing medium can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of aviation fire extinguishing, especially to a hatch structure and a fire extinguishing airplane with the hatch structure. BACKGROUND

[0002] With the increasing severity of forest fires, the demand for rapid and efficient aviation fire extinguishing is increasing, leading to rapid growth in the market demand for fire extinguishing airplanes. Fire extinguishing airplanes are usually equipped with water tanks and drop hatches, which can quickly drop fire extinguishing media (such as water and / or chemical extinguishing agents) during flight. However, the sealing structure of the drop port of the water tank and the drop hatch of the existing fire extinguishing airplane usually only focuses on the sealing effect, without considering the rapid discharge of fire extinguishing media at the same time, which may slow down the water dropping rate and reduce the fire extinguishing efficiency.

[0003] In the prior art, the sealing structure is mostly applied to the pressurized hatch of ordinary airplanes and is not optimized for the rapid discharge of fire extinguishing media (such as patent documents 2-4, 6). Although it also involves the sealing structure design of the water tank of the fire extinguishing airplane (such as patent documents 1, 5), there are generally problems such as complex structure, no flow regulation function, affecting the rapid discharge of fire extinguishing media in the water tank, and difficulty in adapting to different models of fire extinguishing airplanes.

[0004] Prior art documents:

[0005] Patent documents:

[0006] Patent document 1: Chinese patent publication CN117163287A

[0007] Patent document 2: Chinese patent publication CN115370277A

[0008] Patent document 3: Chinese patent publication CN218563517U

[0009] Patent document 4: Chinese patent publication CN208602683U

[0010] Patent document 5: Chinese patent publication CN118182809A

[0011] Patent document 6: Chinese patent publication CN118182809A Utility model content

[0012] Technical problems to be solved by the utility model

[0013] The present application is formed to solve the above technical problems, and its purpose is to provide a hatch structure and a fire extinguishing airplane, which can realize liquid sealing between the water tank and the drop hatch of the fire extinguishing airplane while regulating the fire extinguishing media and accelerating its discharge, thereby improving the fire extinguishing efficiency.

[0014] The technical scheme adopted to solve the technical problems

[0015] The cabin door structure provided by the application comprises a cabin door frame, a delivery cabin door, a sealing stopper and a sealing member.

[0016] According to the cabin door structure provided by the application, the sealing stopper is integrated with the flow regulation function, and the design is simple, easy to install and adjust, and suitable for a wide range of applications.

[0017] In the cabin door structure provided by the application, preferably, at least a part of the flow regulation surface is inclined relative to the center line of the delivery opening, and the closer to the delivery cabin door, the closer to the center line in the extension direction of the center line.

[0018] According to the cabin door structure provided by the application, the excellent flow regulation effect can be ensured by a simple structure.

[0019] In the cabin door structure provided by the application, preferably, the sealing stopper is detachably arranged on the cabin door frame.

[0020] According to the cabin door structure provided by the application, different sealing stoppers can be replaced according to different fluid media to obtain the optimal flow regulation effect.

[0021] In the cabin door structure provided by the application, preferably, the sealing stopper has a mounting surface abutting against the inner periphery of the cabin door frame, and a pressing surface pressing the sealing member when the delivery cabin door is closed.

[0022] In the cabin door structure provided by the application, the surface of the inner periphery of the cabin door frame abutting against the mounting surface is a plane.

[0023] According to the cabin door structure provided by the application, the mounting position and arrangement of the sealing stopper relative to the cabin door frame can be easily adjusted, and the excellent flow regulation effect can be further ensured by a simple structure.

[0024] In the cabin door structure provided by the application, preferably, the sealing stopper is continuously formed along the entire periphery of the delivery opening.

[0025] The cabin door structure according to the present application can further ensure the sealing effect.

[0026] In the cabin door structure according to the present application, the fairing surface of the sealing block is preferably designed to have different shapes according to different fluids.

[0027] The cabin door structure according to the present application can ensure the discharge rate by adjusting the shape of the fairing surface according to the flow characteristics of different extinguishing media.

[0028] In the cabin door structure according to the present application, the cross section of the sealing block is preferably designed to have different shapes according to different positions.

[0029] The cabin door structure according to the present application can further improve the fairing effect.

[0030] In the cabin door structure according to the present application, the discharge door is preferably rotatably connected to the cabin door frame through a hinge.

[0031] In addition, the present application provides a fire extinguishing aircraft comprising the cabin door structure according to any one of the above. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a perspective view showing the sealing structure of the water tank of the fire extinguishing aircraft.

[0033] Figure 2 is a side view showing the sealing structure of the water tank of the fire extinguishing aircraft.

[0034] Figure 3 is Figure 2 is an enlarged view of part A of

[0035] SYMBOL DESCRIPTION:

[0036] 1 - cabin door frame, 2 - sealing block, 21 - mounting surface, 22 - extrusion surface, 23 - fairing surface, 3 - discharge door, 4 - sealing member, 5 - hinge. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with the following embodiments, which should be understood as merely illustrative of the present application, rather than limiting the present application. The same or corresponding reference numerals in the drawings represent the same components, and repeated descriptions are omitted.

[0038] In addition, unless specifically stated and limited otherwise, terms indicating orientation or positional relationships are used for convenience only and are not to be construed as limiting the orientation or positional relationships of the structure, and the terms "mount", "connect", "connect" should be understood broadly, and if the terms "first", "second", "third" are used, they are only for the purpose of description and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0039] The water tank on the fire-fighting aircraft is a device specially designed to store water and / or fire extinguishing agent (such as foam or fire retardant) for extinguishing large-scale fires, especially forest fires. Among them, the water tank discharge port (also known as the water discharge port, etc.) is a passage for discharging water or a mixture of water and fire extinguishing agent, therefore, the sealing requirement when the discharge port is closed and the liquid flow regulation requirement when it is opened are important in the fire fighting force.

[0040] Hereinafter, referring to Figures 1 to 3 The cabin door structure of an embodiment of the present application includes a cabin door frame 1, a sealing stopper 2, a discharge cabin door 3, a sealing member 4, and a hinge part 5. Specifically, the cabin door frame 1 is installed on the aircraft water tank and constitutes a discharge port for discharging water from the water tank to the outside, the discharge cabin door 3 is installed on the cabin door frame 1 in a manner capable of opening and closing the discharge port, the sealing stopper 2 is provided on the inner periphery of the cabin door frame 1, and the sealing member 4 is continuously provided on the periphery of one of the discharge cabin door 3 and the sealing stopper 2, and abuts against the other one of the discharge cabin door 3 and the sealing stopper 2 when the discharge cabin door 3 is closed to seal the discharge port. That is, the sealing member 4 is pressed when the discharge cabin door 3 is closed.

[0041] As shown in Figure 1 In the present embodiment, the cabin door frame 1 is formed as a frame structure of a pair of doors, the hinge part 5 is installed on a pair of edges of the cabin door frame 1 that are relatively far apart, and the two discharge cabin doors 3 are installed on the cabin door frame 1 through the hinge part 5 in a manner capable of being independently opened and closed with respect to the cabin door frame 1. In addition, in actual application, it is not limited to the above description, for example, it can be formed as a single door structure or a sliding door structure, as long as it can meet the corresponding discharge requirements.

[0042] As shown in Figure 2 , Figure 3 In the present embodiment, the sealing stopper 2 has three surfaces, which are: an installation surface 21 abutting against the inner periphery surface of the cabin door frame 1; a pressing surface 22 abutting against the sealing member 4; and a flow regulation surface 23 in contact with the fluid discharged from the aircraft water tank. Among them, the flow regulation surface 23 faces the center of the discharge port and is inclined with respect to the center line L of the discharge port, and guides the flow of water to the outside when the discharge cabin door is opened. In addition, in the present embodiment, the inner surface (cross section) of the sealing stopper 2 can also be optimized through fluid analysis.

[0043] like Figure 3 As shown, the mounting surface 21, the extrusion surface 22, and the rectifying surface 23 are configured with a roughly triangular cross-section. The rectifying surface 23 faces the internal fluid, thus the most favorable profile for efficient flow rectification can be determined based on fluid characteristics and profile optimization. In this embodiment, although the rectifying surface 23 is set as a plane, it is not limited to this. For example, it can be a profile formed by concave or convex curved surfaces, or a profile formed by a combination of curved and flat surfaces, and can be flexibly set according to actual conditions and requirements.

[0044] Furthermore, for example, the cross-section formed by the mounting surface 21, the extrusion surface 22, and the straightening surface 23 (i.e., the cross-section of the sealing baffle 2) can have different cross-sectional shapes at different positions in the circumferential direction surrounding the centerline L of the injection port. For example... Figure 2 As shown in the two triangular shaded areas, due to the gradual change in the inner peripheral surface of the hatch frame 1, the sealing baffle 2 installed on the inner peripheral surface of the hatch frame 1 has different cross-sectional shapes depending on its installation position. The specific changes in its cross-sectional shape can be determined by fluid profile optimization, etc. For example, in this embodiment, the cross-sectional shape of the sealing baffle 2 gradually changes from an approximately isosceles triangle S (left triangular area) to an acute triangle S' (right triangular area, i.e., the mounting surface 21 becomes higher as the hatch frame 1 increases, the rectifying surface 23 becomes longer, and the extrusion surface 22 becomes slightly shorter, etc.). As a result, the sealing baffle 2 can achieve excellent rectification effect at different positions of the injection port.

[0045] Therefore, in addition to squeezing the seal 4 when the release door 3 is closed, the sealing baffle 2 can also quickly rectify the fire extinguishing medium flowing out of the water tank when the release door 3 is open, thereby accelerating the discharge rate and improving the mixing effect, ensuring the efficiency and effectiveness of the fire extinguishing aircraft during operation.

[0046] like Figure 2 , Figure 3 As shown, in this embodiment, the sealing element 4 is disposed on the compression surface 22 of the sealing baffle 2, and the sealing baffle 2 is continuously formed along the entire periphery of the inlet. Alternatively, the sealing element 4 may be disposed on the entire periphery of the inlet hatch 3 and move (rotate) together with the inlet hatch 3. Specifically, the sealing element 4 is installed on the surface of the inlet hatch 3 that is in contact with the fluid in the water tank and is disposed opposite to the compression surface 22 of the sealing baffle 2. In this case, the sealing baffle 2 may not be continuously formed along the entire periphery of the inlet; for example, it may be formed in segments with certain gaps, as long as the sealing element 4 can be squeezed when the inlet hatch 3 is closed to achieve a seal of the fluid in the water tank. Furthermore, in this embodiment, the sealing element 4 can be made of commercially available materials, such as rubber sealing strips, silicone sealing strips, etc., and preferably has a hollow cavity, such as an O-ring sealing strip, but it may also be an F-ring sealing strip or a V-ring sealing strip, etc.

[0047] Based on the above structure, the cabin door structure of the present embodiment can realize sealing when the drop door 3 is closed and realize flow regulation when the drop door 3 is opened. Specifically, when the rotating hinge part 5 is rotated to close the drop door 3, the sealing part 4 is deformed by being pressed together with the drop door 3 and the sealing block 2, thereby realizing liquid sealing of the water tank. When the rotating hinge part 5 is rotated to open the drop door 3, the drop door 3 rotates around the hinge part 5, the drop opening is opened, and the liquid in the water tank flows through the sealing block 2 and is regulated, thereby being smoothly and quickly discharged.

[0048] In addition, in the present embodiment, the inner peripheral surface of the cabin door frame 1 (i.e., the surface in contact with the mounting surface 21 of the sealing block 2) is preferably formed as a flat surface, thereby freely adjusting the mounting height of the sealing block 2. In this way, in the actual manufacturing process, the drop door 3, the hinge part 5, and the sealing part 4 can be installed first, and the mechanism is ensured to operate normally in priority. Then, the sealing block 2 is installed according to the positions of the three, and the compression amount of the sealing part 4 is controlled to ensure the best sealing effect. This greatly improves the design freedom and reduces the installation difficulty.

[0049] In addition, the sealing block 2 can be fastened to the cabin door frame 1 by welding, or can be detachably arranged on the cabin door frame 1 by bolts. Specifically, a plurality of through holes can be formed between the flow regulating surface 23 and the mounting surface 21, the bolts pass through the through holes and are fastened to the inner periphery of the cabin door frame 1, and then the through holes can be filled by pouring or the like to make the flow regulating surface 23 a continuous surface. In addition, the through holes can be continuously arranged at equal intervals around the sealing block 2, but are not limited thereto, and can be arranged flexibly according to requirements, such as being arranged in segments at equal intervals. In addition, when a detachable structure such as a bolted joint or a clamping structure is used, the present application forms a mechanism in which the sealing block 2 is detachably arranged on the cabin door frame 1. Therefore, when the type of fire extinguishing medium in the aircraft is changed, the sealing block can be easily replaced to ensure adaptation to the fire extinguishing medium, greatly increasing the versatility.

[0050] In summary, in the cabin door structure for a water tank of a fire extinguishing aircraft provided by the present application, the sealing block 2 has the function of a flow regulating part in addition to sealing, thereby simultaneously meeting the water sealing requirement of the drop opening of the water tank of the fire extinguishing aircraft and the requirement of rapid discharge of the fire extinguishing medium with a simple structure. Moreover, the sealing block 2 has low installation difficulty, high design freedom, and good product compatibility, and can be widely used in most models of fire extinguishing aircraft on the market. In addition, the inner shape of the sealing block 2 can be adjusted according to the aircraft model, the type of medium, and actual requirements, further expanding its flexibility and adaptability.

[0051] The above detailed description sets forth the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above is only one specific embodiment of the present application, and is not limited to the protection scope of the present application. Without departing from the basic principles of the present application, the present application can be embodied in various forms. Therefore, the embodiments in the present application are used for illustration and not limitation. Since the scope of the present application is defined by the claims and not by the specification, and all changes falling within the scope defined by the claims, or within the equivalent scope of the defined scope, should be understood as included in the claims. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A hatch structure comprising: A door frame that constitutes a discharge port for water in a water tank to be discharged to the outside; A discharge door that is installed in the door frame in a manner capable of opening and closing the discharge port; A seal stopper that is provided to an inner periphery of the door frame; A seal member that is continuously provided to a periphery of one of the discharge door and the seal stopper and that seals the discharge port by abutting against the other of the discharge door and the seal stopper when the discharge door is closed, characterized in that The seal stopper has a flow straightening surface that faces a center of the discharge port and that guides the flow of water to the outside when the discharge door is opened.

2. The door structure according to claim 1, characterized in that At least a portion of the flow straightening surface is inclined with respect to a center line of the discharge port and is closer to the center line in an extension direction of the center line as it is closer to the discharge door.

3. The door structure according to claim 1, characterized in that The seal stopper is detachably provided to the door frame.

4. The door structure according to claim 3, characterized in that The seal stopper has: a mounting surface that abuts against an inner periphery of the door frame; and a pressing surface that presses the seal member when the discharge door is closed.

5. The door structure according to claim 4, characterized in that A surface of the inner periphery of the door frame that abuts against the mounting surface is a flat surface.

6. The door structure according to claim 1, characterized in that The seal stopper is continuously formed along an entire periphery of the discharge port.

7. The door structure according to claim 1, characterized in that The flow straightening surface of the seal stopper is configured to have a different profile according to different fluids.

8. The door structure according to claim 1, characterized in that A cross section of the seal stopper is configured to have a different shape according to different positions.

9. The door structure according to claim 1, characterized in that The discharge door is rotatably connected to the door frame by a hinge portion.

10. A fire-fighting aircraft, characterised in that, A water tank that includes the door structure according to any one of claims 1 to 9.

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